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c99ee51a KC |
1 | /* |
2 | * Copyright (c) 2012 The Chromium OS Authors. All rights reserved. | |
3 | * Use of this source code is governed by the GPLv2 license. | |
4 | * | |
5 | * Test code for seccomp bpf. | |
6 | */ | |
7 | ||
6a21cc50 | 8 | #define _GNU_SOURCE |
0ce105bf | 9 | #include <sys/types.h> |
10859f38 KC |
10 | |
11 | /* | |
12 | * glibc 2.26 and later have SIGSYS in siginfo_t. Before that, | |
13 | * we need to use the kernel's siginfo.h file and trick glibc | |
14 | * into accepting it. | |
15 | */ | |
16 | #if !__GLIBC_PREREQ(2, 26) | |
17 | # include <asm/siginfo.h> | |
18 | # define __have_siginfo_t 1 | |
19 | # define __have_sigval_t 1 | |
20 | # define __have_sigevent_t 1 | |
21 | #endif | |
c99ee51a KC |
22 | |
23 | #include <errno.h> | |
24 | #include <linux/filter.h> | |
25 | #include <sys/prctl.h> | |
26 | #include <sys/ptrace.h> | |
27 | #include <sys/user.h> | |
28 | #include <linux/prctl.h> | |
29 | #include <linux/ptrace.h> | |
30 | #include <linux/seccomp.h> | |
c99ee51a KC |
31 | #include <pthread.h> |
32 | #include <semaphore.h> | |
33 | #include <signal.h> | |
34 | #include <stddef.h> | |
35 | #include <stdbool.h> | |
36 | #include <string.h> | |
256d0afb | 37 | #include <time.h> |
c99ee51a KC |
38 | #include <linux/elf.h> |
39 | #include <sys/uio.h> | |
256d0afb | 40 | #include <sys/utsname.h> |
fd88d16c RS |
41 | #include <sys/fcntl.h> |
42 | #include <sys/mman.h> | |
43 | #include <sys/times.h> | |
6a21cc50 TA |
44 | #include <sys/socket.h> |
45 | #include <sys/ioctl.h> | |
c99ee51a | 46 | |
c99ee51a KC |
47 | #include <unistd.h> |
48 | #include <sys/syscall.h> | |
6a21cc50 | 49 | #include <poll.h> |
c99ee51a | 50 | |
0b40808a | 51 | #include "../kselftest_harness.h" |
c99ee51a KC |
52 | |
53 | #ifndef PR_SET_PTRACER | |
54 | # define PR_SET_PTRACER 0x59616d61 | |
55 | #endif | |
56 | ||
57 | #ifndef PR_SET_NO_NEW_PRIVS | |
58 | #define PR_SET_NO_NEW_PRIVS 38 | |
59 | #define PR_GET_NO_NEW_PRIVS 39 | |
60 | #endif | |
61 | ||
62 | #ifndef PR_SECCOMP_EXT | |
63 | #define PR_SECCOMP_EXT 43 | |
64 | #endif | |
65 | ||
66 | #ifndef SECCOMP_EXT_ACT | |
67 | #define SECCOMP_EXT_ACT 1 | |
68 | #endif | |
69 | ||
70 | #ifndef SECCOMP_EXT_ACT_TSYNC | |
71 | #define SECCOMP_EXT_ACT_TSYNC 1 | |
72 | #endif | |
73 | ||
74 | #ifndef SECCOMP_MODE_STRICT | |
75 | #define SECCOMP_MODE_STRICT 1 | |
76 | #endif | |
77 | ||
78 | #ifndef SECCOMP_MODE_FILTER | |
79 | #define SECCOMP_MODE_FILTER 2 | |
80 | #endif | |
81 | ||
f3e1821d | 82 | #ifndef SECCOMP_RET_ALLOW |
c99ee51a KC |
83 | struct seccomp_data { |
84 | int nr; | |
85 | __u32 arch; | |
86 | __u64 instruction_pointer; | |
87 | __u64 args[6]; | |
88 | }; | |
89 | #endif | |
90 | ||
f3e1821d KC |
91 | #ifndef SECCOMP_RET_KILL_PROCESS |
92 | #define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */ | |
fd76875c KC |
93 | #define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */ |
94 | #endif | |
c99ee51a | 95 | #ifndef SECCOMP_RET_KILL |
fd76875c KC |
96 | #define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD |
97 | #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */ | |
98 | #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */ | |
99 | #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */ | |
100 | #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */ | |
59f5cf44 TH |
101 | #endif |
102 | #ifndef SECCOMP_RET_LOG | |
fd76875c | 103 | #define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */ |
59f5cf44 | 104 | #endif |
c99ee51a | 105 | |
f3e1821d KC |
106 | #ifndef __NR_seccomp |
107 | # if defined(__i386__) | |
108 | # define __NR_seccomp 354 | |
109 | # elif defined(__x86_64__) | |
110 | # define __NR_seccomp 317 | |
111 | # elif defined(__arm__) | |
112 | # define __NR_seccomp 383 | |
113 | # elif defined(__aarch64__) | |
114 | # define __NR_seccomp 277 | |
115 | # elif defined(__hppa__) | |
116 | # define __NR_seccomp 338 | |
117 | # elif defined(__powerpc__) | |
118 | # define __NR_seccomp 358 | |
119 | # elif defined(__s390__) | |
120 | # define __NR_seccomp 348 | |
121 | # else | |
122 | # warning "seccomp syscall number unknown for this architecture" | |
123 | # define __NR_seccomp 0xffff | |
124 | # endif | |
125 | #endif | |
c99ee51a | 126 | |
f3e1821d KC |
127 | #ifndef SECCOMP_SET_MODE_STRICT |
128 | #define SECCOMP_SET_MODE_STRICT 0 | |
129 | #endif | |
130 | ||
131 | #ifndef SECCOMP_SET_MODE_FILTER | |
132 | #define SECCOMP_SET_MODE_FILTER 1 | |
133 | #endif | |
134 | ||
135 | #ifndef SECCOMP_GET_ACTION_AVAIL | |
136 | #define SECCOMP_GET_ACTION_AVAIL 2 | |
137 | #endif | |
138 | ||
6a21cc50 TA |
139 | #ifndef SECCOMP_GET_NOTIF_SIZES |
140 | #define SECCOMP_GET_NOTIF_SIZES 3 | |
141 | #endif | |
142 | ||
f3e1821d | 143 | #ifndef SECCOMP_FILTER_FLAG_TSYNC |
00a02d0c | 144 | #define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0) |
f3e1821d KC |
145 | #endif |
146 | ||
147 | #ifndef SECCOMP_FILTER_FLAG_LOG | |
00a02d0c KC |
148 | #define SECCOMP_FILTER_FLAG_LOG (1UL << 1) |
149 | #endif | |
150 | ||
151 | #ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW | |
152 | #define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2) | |
f3e1821d KC |
153 | #endif |
154 | ||
d057dc4e TA |
155 | #ifndef PTRACE_SECCOMP_GET_METADATA |
156 | #define PTRACE_SECCOMP_GET_METADATA 0x420d | |
157 | ||
158 | struct seccomp_metadata { | |
159 | __u64 filter_off; /* Input: which filter */ | |
160 | __u64 flags; /* Output: filter's flags */ | |
161 | }; | |
162 | #endif | |
163 | ||
6a21cc50 TA |
164 | #ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER |
165 | #define SECCOMP_FILTER_FLAG_NEW_LISTENER (1UL << 3) | |
166 | ||
167 | #define SECCOMP_RET_USER_NOTIF 0x7fc00000U | |
168 | ||
169 | #define SECCOMP_IOC_MAGIC '!' | |
170 | #define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr) | |
171 | #define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type) | |
172 | #define SECCOMP_IOW(nr, type) _IOW(SECCOMP_IOC_MAGIC, nr, type) | |
173 | #define SECCOMP_IOWR(nr, type) _IOWR(SECCOMP_IOC_MAGIC, nr, type) | |
174 | ||
175 | /* Flags for seccomp notification fd ioctl. */ | |
176 | #define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif) | |
177 | #define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \ | |
178 | struct seccomp_notif_resp) | |
179 | #define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64) | |
180 | ||
181 | struct seccomp_notif { | |
182 | __u64 id; | |
183 | __u32 pid; | |
184 | __u32 flags; | |
185 | struct seccomp_data data; | |
186 | }; | |
187 | ||
188 | struct seccomp_notif_resp { | |
189 | __u64 id; | |
190 | __s64 val; | |
191 | __s32 error; | |
192 | __u32 flags; | |
193 | }; | |
194 | ||
195 | struct seccomp_notif_sizes { | |
196 | __u16 seccomp_notif; | |
197 | __u16 seccomp_notif_resp; | |
198 | __u16 seccomp_data; | |
199 | }; | |
200 | #endif | |
201 | ||
f3e1821d KC |
202 | #ifndef seccomp |
203 | int seccomp(unsigned int op, unsigned int flags, void *args) | |
204 | { | |
205 | errno = 0; | |
206 | return syscall(__NR_seccomp, op, flags, args); | |
207 | } | |
c99ee51a KC |
208 | #endif |
209 | ||
c385d0db | 210 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
c99ee51a | 211 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n])) |
c385d0db ME |
212 | #elif __BYTE_ORDER == __BIG_ENDIAN |
213 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32)) | |
214 | #else | |
215 | #error "wut? Unknown __BYTE_ORDER?!" | |
216 | #endif | |
c99ee51a KC |
217 | |
218 | #define SIBLING_EXIT_UNKILLED 0xbadbeef | |
219 | #define SIBLING_EXIT_FAILURE 0xbadface | |
220 | #define SIBLING_EXIT_NEWPRIVS 0xbadfeed | |
221 | ||
222 | TEST(mode_strict_support) | |
223 | { | |
224 | long ret; | |
225 | ||
226 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
227 | ASSERT_EQ(0, ret) { | |
228 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
229 | } | |
369130b6 | 230 | syscall(__NR_exit, 0); |
c99ee51a KC |
231 | } |
232 | ||
233 | TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL) | |
234 | { | |
235 | long ret; | |
236 | ||
237 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
238 | ASSERT_EQ(0, ret) { | |
239 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
240 | } | |
241 | syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
242 | NULL, NULL, NULL); | |
243 | EXPECT_FALSE(true) { | |
244 | TH_LOG("Unreachable!"); | |
245 | } | |
246 | } | |
247 | ||
248 | /* Note! This doesn't test no new privs behavior */ | |
249 | TEST(no_new_privs_support) | |
250 | { | |
251 | long ret; | |
252 | ||
253 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
254 | EXPECT_EQ(0, ret) { | |
255 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
256 | } | |
257 | } | |
258 | ||
f3f6e306 | 259 | /* Tests kernel support by checking for a copy_from_user() fault on NULL. */ |
c99ee51a KC |
260 | TEST(mode_filter_support) |
261 | { | |
262 | long ret; | |
263 | ||
264 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
265 | ASSERT_EQ(0, ret) { | |
266 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
267 | } | |
268 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL); | |
269 | EXPECT_EQ(-1, ret); | |
270 | EXPECT_EQ(EFAULT, errno) { | |
271 | TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!"); | |
272 | } | |
273 | } | |
274 | ||
275 | TEST(mode_filter_without_nnp) | |
276 | { | |
277 | struct sock_filter filter[] = { | |
278 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
279 | }; | |
280 | struct sock_fprog prog = { | |
281 | .len = (unsigned short)ARRAY_SIZE(filter), | |
282 | .filter = filter, | |
283 | }; | |
284 | long ret; | |
285 | ||
286 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0); | |
287 | ASSERT_LE(0, ret) { | |
288 | TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS"); | |
289 | } | |
290 | errno = 0; | |
291 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
292 | /* Succeeds with CAP_SYS_ADMIN, fails without */ | |
293 | /* TODO(wad) check caps not euid */ | |
294 | if (geteuid()) { | |
295 | EXPECT_EQ(-1, ret); | |
296 | EXPECT_EQ(EACCES, errno); | |
297 | } else { | |
298 | EXPECT_EQ(0, ret); | |
299 | } | |
300 | } | |
301 | ||
302 | #define MAX_INSNS_PER_PATH 32768 | |
303 | ||
304 | TEST(filter_size_limits) | |
305 | { | |
306 | int i; | |
307 | int count = BPF_MAXINSNS + 1; | |
308 | struct sock_filter allow[] = { | |
309 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
310 | }; | |
311 | struct sock_filter *filter; | |
312 | struct sock_fprog prog = { }; | |
313 | long ret; | |
314 | ||
315 | filter = calloc(count, sizeof(*filter)); | |
316 | ASSERT_NE(NULL, filter); | |
317 | ||
318 | for (i = 0; i < count; i++) | |
319 | filter[i] = allow[0]; | |
320 | ||
321 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
322 | ASSERT_EQ(0, ret); | |
323 | ||
324 | prog.filter = filter; | |
325 | prog.len = count; | |
326 | ||
327 | /* Too many filter instructions in a single filter. */ | |
328 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
329 | ASSERT_NE(0, ret) { | |
330 | TH_LOG("Installing %d insn filter was allowed", prog.len); | |
331 | } | |
332 | ||
333 | /* One less is okay, though. */ | |
334 | prog.len -= 1; | |
335 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
336 | ASSERT_EQ(0, ret) { | |
337 | TH_LOG("Installing %d insn filter wasn't allowed", prog.len); | |
338 | } | |
339 | } | |
340 | ||
341 | TEST(filter_chain_limits) | |
342 | { | |
343 | int i; | |
344 | int count = BPF_MAXINSNS; | |
345 | struct sock_filter allow[] = { | |
346 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
347 | }; | |
348 | struct sock_filter *filter; | |
349 | struct sock_fprog prog = { }; | |
350 | long ret; | |
351 | ||
352 | filter = calloc(count, sizeof(*filter)); | |
353 | ASSERT_NE(NULL, filter); | |
354 | ||
355 | for (i = 0; i < count; i++) | |
356 | filter[i] = allow[0]; | |
357 | ||
358 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
359 | ASSERT_EQ(0, ret); | |
360 | ||
361 | prog.filter = filter; | |
362 | prog.len = 1; | |
363 | ||
364 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
365 | ASSERT_EQ(0, ret); | |
366 | ||
367 | prog.len = count; | |
368 | ||
369 | /* Too many total filter instructions. */ | |
370 | for (i = 0; i < MAX_INSNS_PER_PATH; i++) { | |
371 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
372 | if (ret != 0) | |
373 | break; | |
374 | } | |
375 | ASSERT_NE(0, ret) { | |
376 | TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)", | |
377 | i, count, i * (count + 4)); | |
378 | } | |
379 | } | |
380 | ||
381 | TEST(mode_filter_cannot_move_to_strict) | |
382 | { | |
383 | struct sock_filter filter[] = { | |
384 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
385 | }; | |
386 | struct sock_fprog prog = { | |
387 | .len = (unsigned short)ARRAY_SIZE(filter), | |
388 | .filter = filter, | |
389 | }; | |
390 | long ret; | |
391 | ||
392 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
393 | ASSERT_EQ(0, ret); | |
394 | ||
395 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
396 | ASSERT_EQ(0, ret); | |
397 | ||
398 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0); | |
399 | EXPECT_EQ(-1, ret); | |
400 | EXPECT_EQ(EINVAL, errno); | |
401 | } | |
402 | ||
403 | ||
404 | TEST(mode_filter_get_seccomp) | |
405 | { | |
406 | struct sock_filter filter[] = { | |
407 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
408 | }; | |
409 | struct sock_fprog prog = { | |
410 | .len = (unsigned short)ARRAY_SIZE(filter), | |
411 | .filter = filter, | |
412 | }; | |
413 | long ret; | |
414 | ||
415 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
416 | ASSERT_EQ(0, ret); | |
417 | ||
418 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
419 | EXPECT_EQ(0, ret); | |
420 | ||
421 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
422 | ASSERT_EQ(0, ret); | |
423 | ||
424 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
425 | EXPECT_EQ(2, ret); | |
426 | } | |
427 | ||
428 | ||
429 | TEST(ALLOW_all) | |
430 | { | |
431 | struct sock_filter filter[] = { | |
432 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
433 | }; | |
434 | struct sock_fprog prog = { | |
435 | .len = (unsigned short)ARRAY_SIZE(filter), | |
436 | .filter = filter, | |
437 | }; | |
438 | long ret; | |
439 | ||
440 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
441 | ASSERT_EQ(0, ret); | |
442 | ||
443 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
444 | ASSERT_EQ(0, ret); | |
445 | } | |
446 | ||
447 | TEST(empty_prog) | |
448 | { | |
449 | struct sock_filter filter[] = { | |
450 | }; | |
451 | struct sock_fprog prog = { | |
452 | .len = (unsigned short)ARRAY_SIZE(filter), | |
453 | .filter = filter, | |
454 | }; | |
455 | long ret; | |
456 | ||
457 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
458 | ASSERT_EQ(0, ret); | |
459 | ||
460 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
461 | EXPECT_EQ(-1, ret); | |
462 | EXPECT_EQ(EINVAL, errno); | |
463 | } | |
464 | ||
59f5cf44 TH |
465 | TEST(log_all) |
466 | { | |
467 | struct sock_filter filter[] = { | |
468 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG), | |
469 | }; | |
470 | struct sock_fprog prog = { | |
471 | .len = (unsigned short)ARRAY_SIZE(filter), | |
472 | .filter = filter, | |
473 | }; | |
474 | long ret; | |
475 | pid_t parent = getppid(); | |
476 | ||
477 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
478 | ASSERT_EQ(0, ret); | |
479 | ||
480 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
481 | ASSERT_EQ(0, ret); | |
482 | ||
483 | /* getppid() should succeed and be logged (no check for logging) */ | |
484 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
485 | } | |
486 | ||
c99ee51a KC |
487 | TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS) |
488 | { | |
489 | struct sock_filter filter[] = { | |
490 | BPF_STMT(BPF_RET|BPF_K, 0x10000000U), | |
491 | }; | |
492 | struct sock_fprog prog = { | |
493 | .len = (unsigned short)ARRAY_SIZE(filter), | |
494 | .filter = filter, | |
495 | }; | |
496 | long ret; | |
497 | ||
498 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
499 | ASSERT_EQ(0, ret); | |
500 | ||
501 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
502 | ASSERT_EQ(0, ret); | |
503 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
504 | TH_LOG("getpid() shouldn't ever return"); | |
505 | } | |
506 | } | |
507 | ||
508 | /* return code >= 0x80000000 is unused. */ | |
509 | TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS) | |
510 | { | |
511 | struct sock_filter filter[] = { | |
512 | BPF_STMT(BPF_RET|BPF_K, 0x90000000U), | |
513 | }; | |
514 | struct sock_fprog prog = { | |
515 | .len = (unsigned short)ARRAY_SIZE(filter), | |
516 | .filter = filter, | |
517 | }; | |
518 | long ret; | |
519 | ||
520 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
521 | ASSERT_EQ(0, ret); | |
522 | ||
523 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
524 | ASSERT_EQ(0, ret); | |
525 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
526 | TH_LOG("getpid() shouldn't ever return"); | |
527 | } | |
528 | } | |
529 | ||
530 | TEST_SIGNAL(KILL_all, SIGSYS) | |
531 | { | |
532 | struct sock_filter filter[] = { | |
533 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
534 | }; | |
535 | struct sock_fprog prog = { | |
536 | .len = (unsigned short)ARRAY_SIZE(filter), | |
537 | .filter = filter, | |
538 | }; | |
539 | long ret; | |
540 | ||
541 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
542 | ASSERT_EQ(0, ret); | |
543 | ||
544 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
545 | ASSERT_EQ(0, ret); | |
546 | } | |
547 | ||
548 | TEST_SIGNAL(KILL_one, SIGSYS) | |
549 | { | |
550 | struct sock_filter filter[] = { | |
551 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
552 | offsetof(struct seccomp_data, nr)), | |
553 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
554 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
555 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
556 | }; | |
557 | struct sock_fprog prog = { | |
558 | .len = (unsigned short)ARRAY_SIZE(filter), | |
559 | .filter = filter, | |
560 | }; | |
561 | long ret; | |
562 | pid_t parent = getppid(); | |
563 | ||
564 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
565 | ASSERT_EQ(0, ret); | |
566 | ||
567 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
568 | ASSERT_EQ(0, ret); | |
569 | ||
570 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
571 | /* getpid() should never return. */ | |
572 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
573 | } | |
574 | ||
575 | TEST_SIGNAL(KILL_one_arg_one, SIGSYS) | |
576 | { | |
fd88d16c | 577 | void *fatal_address; |
c99ee51a KC |
578 | struct sock_filter filter[] = { |
579 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
580 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 581 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0), |
c99ee51a KC |
582 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
583 | /* Only both with lower 32-bit for now. */ | |
584 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)), | |
fd88d16c RS |
585 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, |
586 | (unsigned long)&fatal_address, 0, 1), | |
c99ee51a KC |
587 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), |
588 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
589 | }; | |
590 | struct sock_fprog prog = { | |
591 | .len = (unsigned short)ARRAY_SIZE(filter), | |
592 | .filter = filter, | |
593 | }; | |
594 | long ret; | |
595 | pid_t parent = getppid(); | |
fd88d16c RS |
596 | struct tms timebuf; |
597 | clock_t clock = times(&timebuf); | |
c99ee51a KC |
598 | |
599 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
600 | ASSERT_EQ(0, ret); | |
601 | ||
602 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
603 | ASSERT_EQ(0, ret); | |
604 | ||
605 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
fd88d16c RS |
606 | EXPECT_LE(clock, syscall(__NR_times, &timebuf)); |
607 | /* times() should never return. */ | |
608 | EXPECT_EQ(0, syscall(__NR_times, &fatal_address)); | |
c99ee51a KC |
609 | } |
610 | ||
611 | TEST_SIGNAL(KILL_one_arg_six, SIGSYS) | |
612 | { | |
fd88d16c RS |
613 | #ifndef __NR_mmap2 |
614 | int sysno = __NR_mmap; | |
615 | #else | |
616 | int sysno = __NR_mmap2; | |
617 | #endif | |
c99ee51a KC |
618 | struct sock_filter filter[] = { |
619 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
620 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 621 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0), |
c99ee51a KC |
622 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
623 | /* Only both with lower 32-bit for now. */ | |
624 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)), | |
625 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1), | |
626 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
627 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
628 | }; | |
629 | struct sock_fprog prog = { | |
630 | .len = (unsigned short)ARRAY_SIZE(filter), | |
631 | .filter = filter, | |
632 | }; | |
633 | long ret; | |
634 | pid_t parent = getppid(); | |
fd88d16c RS |
635 | int fd; |
636 | void *map1, *map2; | |
2ce47b44 BJZ |
637 | int page_size = sysconf(_SC_PAGESIZE); |
638 | ||
639 | ASSERT_LT(0, page_size); | |
c99ee51a KC |
640 | |
641 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
642 | ASSERT_EQ(0, ret); | |
643 | ||
644 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
645 | ASSERT_EQ(0, ret); | |
646 | ||
fd88d16c RS |
647 | fd = open("/dev/zero", O_RDONLY); |
648 | ASSERT_NE(-1, fd); | |
649 | ||
c99ee51a | 650 | EXPECT_EQ(parent, syscall(__NR_getppid)); |
fd88d16c | 651 | map1 = (void *)syscall(sysno, |
2ce47b44 | 652 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size); |
fd88d16c RS |
653 | EXPECT_NE(MAP_FAILED, map1); |
654 | /* mmap2() should never return. */ | |
655 | map2 = (void *)syscall(sysno, | |
2ce47b44 | 656 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE); |
fd88d16c RS |
657 | EXPECT_EQ(MAP_FAILED, map2); |
658 | ||
659 | /* The test failed, so clean up the resources. */ | |
2ce47b44 BJZ |
660 | munmap(map1, page_size); |
661 | munmap(map2, page_size); | |
fd88d16c | 662 | close(fd); |
c99ee51a KC |
663 | } |
664 | ||
f3e1821d KC |
665 | /* This is a thread task to die via seccomp filter violation. */ |
666 | void *kill_thread(void *data) | |
667 | { | |
668 | bool die = (bool)data; | |
669 | ||
670 | if (die) { | |
671 | prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
672 | return (void *)SIBLING_EXIT_FAILURE; | |
673 | } | |
674 | ||
675 | return (void *)SIBLING_EXIT_UNKILLED; | |
676 | } | |
677 | ||
678 | /* Prepare a thread that will kill itself or both of us. */ | |
679 | void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process) | |
680 | { | |
681 | pthread_t thread; | |
682 | void *status; | |
683 | /* Kill only when calling __NR_prctl. */ | |
684 | struct sock_filter filter_thread[] = { | |
685 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
686 | offsetof(struct seccomp_data, nr)), | |
687 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
688 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD), | |
689 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
690 | }; | |
691 | struct sock_fprog prog_thread = { | |
692 | .len = (unsigned short)ARRAY_SIZE(filter_thread), | |
693 | .filter = filter_thread, | |
694 | }; | |
695 | struct sock_filter filter_process[] = { | |
696 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
697 | offsetof(struct seccomp_data, nr)), | |
698 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
699 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS), | |
700 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
701 | }; | |
702 | struct sock_fprog prog_process = { | |
703 | .len = (unsigned short)ARRAY_SIZE(filter_process), | |
704 | .filter = filter_process, | |
705 | }; | |
706 | ||
707 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
708 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
709 | } | |
710 | ||
711 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, | |
712 | kill_process ? &prog_process : &prog_thread)); | |
713 | ||
714 | /* | |
715 | * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS | |
716 | * flag cannot be downgraded by a new filter. | |
717 | */ | |
718 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread)); | |
719 | ||
720 | /* Start a thread that will exit immediately. */ | |
721 | ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false)); | |
722 | ASSERT_EQ(0, pthread_join(thread, &status)); | |
723 | ASSERT_EQ(SIBLING_EXIT_UNKILLED, (unsigned long)status); | |
724 | ||
725 | /* Start a thread that will die immediately. */ | |
726 | ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)true)); | |
727 | ASSERT_EQ(0, pthread_join(thread, &status)); | |
728 | ASSERT_NE(SIBLING_EXIT_FAILURE, (unsigned long)status); | |
729 | ||
730 | /* | |
731 | * If we get here, only the spawned thread died. Let the parent know | |
732 | * the whole process didn't die (i.e. this thread, the spawner, | |
733 | * stayed running). | |
734 | */ | |
735 | exit(42); | |
736 | } | |
737 | ||
738 | TEST(KILL_thread) | |
739 | { | |
740 | int status; | |
741 | pid_t child_pid; | |
742 | ||
743 | child_pid = fork(); | |
744 | ASSERT_LE(0, child_pid); | |
745 | if (child_pid == 0) { | |
746 | kill_thread_or_group(_metadata, false); | |
747 | _exit(38); | |
748 | } | |
749 | ||
750 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
751 | ||
752 | /* If only the thread was killed, we'll see exit 42. */ | |
753 | ASSERT_TRUE(WIFEXITED(status)); | |
754 | ASSERT_EQ(42, WEXITSTATUS(status)); | |
755 | } | |
756 | ||
757 | TEST(KILL_process) | |
758 | { | |
759 | int status; | |
760 | pid_t child_pid; | |
761 | ||
762 | child_pid = fork(); | |
763 | ASSERT_LE(0, child_pid); | |
764 | if (child_pid == 0) { | |
765 | kill_thread_or_group(_metadata, true); | |
766 | _exit(38); | |
767 | } | |
768 | ||
769 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
770 | ||
771 | /* If the entire process was killed, we'll see SIGSYS. */ | |
772 | ASSERT_TRUE(WIFSIGNALED(status)); | |
773 | ASSERT_EQ(SIGSYS, WTERMSIG(status)); | |
774 | } | |
775 | ||
c99ee51a KC |
776 | /* TODO(wad) add 64-bit versus 32-bit arg tests. */ |
777 | TEST(arg_out_of_range) | |
778 | { | |
779 | struct sock_filter filter[] = { | |
780 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)), | |
781 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
782 | }; | |
783 | struct sock_fprog prog = { | |
784 | .len = (unsigned short)ARRAY_SIZE(filter), | |
785 | .filter = filter, | |
786 | }; | |
787 | long ret; | |
788 | ||
789 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
790 | ASSERT_EQ(0, ret); | |
791 | ||
792 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
793 | EXPECT_EQ(-1, ret); | |
794 | EXPECT_EQ(EINVAL, errno); | |
795 | } | |
796 | ||
f3f6e306 KC |
797 | #define ERRNO_FILTER(name, errno) \ |
798 | struct sock_filter _read_filter_##name[] = { \ | |
799 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \ | |
800 | offsetof(struct seccomp_data, nr)), \ | |
801 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \ | |
802 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \ | |
803 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \ | |
804 | }; \ | |
805 | struct sock_fprog prog_##name = { \ | |
806 | .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \ | |
807 | .filter = _read_filter_##name, \ | |
808 | } | |
809 | ||
810 | /* Make sure basic errno values are correctly passed through a filter. */ | |
c99ee51a KC |
811 | TEST(ERRNO_valid) |
812 | { | |
f3f6e306 | 813 | ERRNO_FILTER(valid, E2BIG); |
c99ee51a KC |
814 | long ret; |
815 | pid_t parent = getppid(); | |
816 | ||
817 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
818 | ASSERT_EQ(0, ret); | |
819 | ||
f3f6e306 | 820 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid); |
c99ee51a KC |
821 | ASSERT_EQ(0, ret); |
822 | ||
823 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
824 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
825 | EXPECT_EQ(E2BIG, errno); | |
826 | } | |
827 | ||
f3f6e306 | 828 | /* Make sure an errno of zero is correctly handled by the arch code. */ |
c99ee51a KC |
829 | TEST(ERRNO_zero) |
830 | { | |
f3f6e306 | 831 | ERRNO_FILTER(zero, 0); |
c99ee51a KC |
832 | long ret; |
833 | pid_t parent = getppid(); | |
834 | ||
835 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
836 | ASSERT_EQ(0, ret); | |
837 | ||
f3f6e306 | 838 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero); |
c99ee51a KC |
839 | ASSERT_EQ(0, ret); |
840 | ||
841 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
842 | /* "errno" of 0 is ok. */ | |
843 | EXPECT_EQ(0, read(0, NULL, 0)); | |
844 | } | |
845 | ||
f3f6e306 KC |
846 | /* |
847 | * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller. | |
848 | * This tests that the errno value gets capped correctly, fixed by | |
849 | * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO"). | |
850 | */ | |
c99ee51a KC |
851 | TEST(ERRNO_capped) |
852 | { | |
f3f6e306 | 853 | ERRNO_FILTER(capped, 4096); |
c99ee51a KC |
854 | long ret; |
855 | pid_t parent = getppid(); | |
856 | ||
857 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
858 | ASSERT_EQ(0, ret); | |
859 | ||
f3f6e306 | 860 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped); |
c99ee51a KC |
861 | ASSERT_EQ(0, ret); |
862 | ||
863 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
864 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
865 | EXPECT_EQ(4095, errno); | |
866 | } | |
867 | ||
f3f6e306 KC |
868 | /* |
869 | * Filters are processed in reverse order: last applied is executed first. | |
870 | * Since only the SECCOMP_RET_ACTION mask is tested for return values, the | |
871 | * SECCOMP_RET_DATA mask results will follow the most recently applied | |
872 | * matching filter return (and not the lowest or highest value). | |
873 | */ | |
874 | TEST(ERRNO_order) | |
875 | { | |
876 | ERRNO_FILTER(first, 11); | |
877 | ERRNO_FILTER(second, 13); | |
878 | ERRNO_FILTER(third, 12); | |
879 | long ret; | |
880 | pid_t parent = getppid(); | |
881 | ||
882 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
883 | ASSERT_EQ(0, ret); | |
884 | ||
885 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first); | |
886 | ASSERT_EQ(0, ret); | |
887 | ||
888 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second); | |
889 | ASSERT_EQ(0, ret); | |
890 | ||
891 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third); | |
892 | ASSERT_EQ(0, ret); | |
893 | ||
894 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
895 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
896 | EXPECT_EQ(12, errno); | |
897 | } | |
898 | ||
c99ee51a KC |
899 | FIXTURE_DATA(TRAP) { |
900 | struct sock_fprog prog; | |
901 | }; | |
902 | ||
903 | FIXTURE_SETUP(TRAP) | |
904 | { | |
905 | struct sock_filter filter[] = { | |
906 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
907 | offsetof(struct seccomp_data, nr)), | |
908 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
909 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
910 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
911 | }; | |
912 | ||
913 | memset(&self->prog, 0, sizeof(self->prog)); | |
914 | self->prog.filter = malloc(sizeof(filter)); | |
915 | ASSERT_NE(NULL, self->prog.filter); | |
916 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
917 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
918 | } | |
919 | ||
920 | FIXTURE_TEARDOWN(TRAP) | |
921 | { | |
922 | if (self->prog.filter) | |
923 | free(self->prog.filter); | |
924 | } | |
925 | ||
926 | TEST_F_SIGNAL(TRAP, dfl, SIGSYS) | |
927 | { | |
928 | long ret; | |
929 | ||
930 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
931 | ASSERT_EQ(0, ret); | |
932 | ||
933 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
934 | ASSERT_EQ(0, ret); | |
935 | syscall(__NR_getpid); | |
936 | } | |
937 | ||
938 | /* Ensure that SIGSYS overrides SIG_IGN */ | |
939 | TEST_F_SIGNAL(TRAP, ign, SIGSYS) | |
940 | { | |
941 | long ret; | |
942 | ||
943 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
944 | ASSERT_EQ(0, ret); | |
945 | ||
946 | signal(SIGSYS, SIG_IGN); | |
947 | ||
948 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
949 | ASSERT_EQ(0, ret); | |
950 | syscall(__NR_getpid); | |
951 | } | |
952 | ||
10859f38 | 953 | static siginfo_t TRAP_info; |
c99ee51a KC |
954 | static volatile int TRAP_nr; |
955 | static void TRAP_action(int nr, siginfo_t *info, void *void_context) | |
956 | { | |
957 | memcpy(&TRAP_info, info, sizeof(TRAP_info)); | |
958 | TRAP_nr = nr; | |
959 | } | |
960 | ||
961 | TEST_F(TRAP, handler) | |
962 | { | |
963 | int ret, test; | |
964 | struct sigaction act; | |
965 | sigset_t mask; | |
966 | ||
967 | memset(&act, 0, sizeof(act)); | |
968 | sigemptyset(&mask); | |
969 | sigaddset(&mask, SIGSYS); | |
970 | ||
971 | act.sa_sigaction = &TRAP_action; | |
972 | act.sa_flags = SA_SIGINFO; | |
973 | ret = sigaction(SIGSYS, &act, NULL); | |
974 | ASSERT_EQ(0, ret) { | |
975 | TH_LOG("sigaction failed"); | |
976 | } | |
977 | ret = sigprocmask(SIG_UNBLOCK, &mask, NULL); | |
978 | ASSERT_EQ(0, ret) { | |
979 | TH_LOG("sigprocmask failed"); | |
980 | } | |
981 | ||
982 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
983 | ASSERT_EQ(0, ret); | |
984 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
985 | ASSERT_EQ(0, ret); | |
986 | TRAP_nr = 0; | |
987 | memset(&TRAP_info, 0, sizeof(TRAP_info)); | |
988 | /* Expect the registers to be rolled back. (nr = error) may vary | |
989 | * based on arch. */ | |
990 | ret = syscall(__NR_getpid); | |
991 | /* Silence gcc warning about volatile. */ | |
992 | test = TRAP_nr; | |
993 | EXPECT_EQ(SIGSYS, test); | |
994 | struct local_sigsys { | |
995 | void *_call_addr; /* calling user insn */ | |
996 | int _syscall; /* triggering system call number */ | |
997 | unsigned int _arch; /* AUDIT_ARCH_* of syscall */ | |
998 | } *sigsys = (struct local_sigsys *) | |
999 | #ifdef si_syscall | |
1000 | &(TRAP_info.si_call_addr); | |
1001 | #else | |
1002 | &TRAP_info.si_pid; | |
1003 | #endif | |
1004 | EXPECT_EQ(__NR_getpid, sigsys->_syscall); | |
1005 | /* Make sure arch is non-zero. */ | |
1006 | EXPECT_NE(0, sigsys->_arch); | |
1007 | EXPECT_NE(0, (unsigned long)sigsys->_call_addr); | |
1008 | } | |
1009 | ||
1010 | FIXTURE_DATA(precedence) { | |
1011 | struct sock_fprog allow; | |
59f5cf44 | 1012 | struct sock_fprog log; |
c99ee51a KC |
1013 | struct sock_fprog trace; |
1014 | struct sock_fprog error; | |
1015 | struct sock_fprog trap; | |
1016 | struct sock_fprog kill; | |
1017 | }; | |
1018 | ||
1019 | FIXTURE_SETUP(precedence) | |
1020 | { | |
1021 | struct sock_filter allow_insns[] = { | |
1022 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1023 | }; | |
59f5cf44 TH |
1024 | struct sock_filter log_insns[] = { |
1025 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1026 | offsetof(struct seccomp_data, nr)), | |
1027 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1028 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1029 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG), | |
1030 | }; | |
c99ee51a KC |
1031 | struct sock_filter trace_insns[] = { |
1032 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1033 | offsetof(struct seccomp_data, nr)), | |
1034 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1035 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1036 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE), | |
1037 | }; | |
1038 | struct sock_filter error_insns[] = { | |
1039 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1040 | offsetof(struct seccomp_data, nr)), | |
1041 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1042 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1043 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO), | |
1044 | }; | |
1045 | struct sock_filter trap_insns[] = { | |
1046 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1047 | offsetof(struct seccomp_data, nr)), | |
1048 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1049 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1050 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
1051 | }; | |
1052 | struct sock_filter kill_insns[] = { | |
1053 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1054 | offsetof(struct seccomp_data, nr)), | |
1055 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1056 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1057 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1058 | }; | |
1059 | ||
1060 | memset(self, 0, sizeof(*self)); | |
1061 | #define FILTER_ALLOC(_x) \ | |
1062 | self->_x.filter = malloc(sizeof(_x##_insns)); \ | |
1063 | ASSERT_NE(NULL, self->_x.filter); \ | |
1064 | memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \ | |
1065 | self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns) | |
1066 | FILTER_ALLOC(allow); | |
59f5cf44 | 1067 | FILTER_ALLOC(log); |
c99ee51a KC |
1068 | FILTER_ALLOC(trace); |
1069 | FILTER_ALLOC(error); | |
1070 | FILTER_ALLOC(trap); | |
1071 | FILTER_ALLOC(kill); | |
1072 | } | |
1073 | ||
1074 | FIXTURE_TEARDOWN(precedence) | |
1075 | { | |
1076 | #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter) | |
1077 | FILTER_FREE(allow); | |
59f5cf44 | 1078 | FILTER_FREE(log); |
c99ee51a KC |
1079 | FILTER_FREE(trace); |
1080 | FILTER_FREE(error); | |
1081 | FILTER_FREE(trap); | |
1082 | FILTER_FREE(kill); | |
1083 | } | |
1084 | ||
1085 | TEST_F(precedence, allow_ok) | |
1086 | { | |
1087 | pid_t parent, res = 0; | |
1088 | long ret; | |
1089 | ||
1090 | parent = getppid(); | |
1091 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1092 | ASSERT_EQ(0, ret); | |
1093 | ||
1094 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1095 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1096 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1097 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1098 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1099 | ASSERT_EQ(0, ret); | |
1100 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1101 | ASSERT_EQ(0, ret); | |
1102 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1103 | ASSERT_EQ(0, ret); | |
1104 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
1105 | ASSERT_EQ(0, ret); | |
1106 | /* Should work just fine. */ | |
1107 | res = syscall(__NR_getppid); | |
1108 | EXPECT_EQ(parent, res); | |
1109 | } | |
1110 | ||
1111 | TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS) | |
1112 | { | |
1113 | pid_t parent, res = 0; | |
1114 | long ret; | |
1115 | ||
1116 | parent = getppid(); | |
1117 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1118 | ASSERT_EQ(0, ret); | |
1119 | ||
1120 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1121 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1122 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1123 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1124 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1125 | ASSERT_EQ(0, ret); | |
1126 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1127 | ASSERT_EQ(0, ret); | |
1128 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1129 | ASSERT_EQ(0, ret); | |
1130 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
1131 | ASSERT_EQ(0, ret); | |
1132 | /* Should work just fine. */ | |
1133 | res = syscall(__NR_getppid); | |
1134 | EXPECT_EQ(parent, res); | |
1135 | /* getpid() should never return. */ | |
1136 | res = syscall(__NR_getpid); | |
1137 | EXPECT_EQ(0, res); | |
1138 | } | |
1139 | ||
1140 | TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS) | |
1141 | { | |
1142 | pid_t parent; | |
1143 | long ret; | |
1144 | ||
1145 | parent = getppid(); | |
1146 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1147 | ASSERT_EQ(0, ret); | |
1148 | ||
1149 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1150 | ASSERT_EQ(0, ret); | |
1151 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
1152 | ASSERT_EQ(0, ret); | |
1153 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1154 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1155 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1156 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1157 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1158 | ASSERT_EQ(0, ret); | |
1159 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1160 | ASSERT_EQ(0, ret); | |
1161 | /* Should work just fine. */ | |
1162 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1163 | /* getpid() should never return. */ | |
1164 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1165 | } | |
1166 | ||
1167 | TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS) | |
1168 | { | |
1169 | pid_t parent; | |
1170 | long ret; | |
1171 | ||
1172 | parent = getppid(); | |
1173 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1174 | ASSERT_EQ(0, ret); | |
1175 | ||
1176 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1177 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1178 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1179 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1180 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1181 | ASSERT_EQ(0, ret); | |
1182 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1183 | ASSERT_EQ(0, ret); | |
1184 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1185 | ASSERT_EQ(0, ret); | |
1186 | /* Should work just fine. */ | |
1187 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1188 | /* getpid() should never return. */ | |
1189 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1190 | } | |
1191 | ||
1192 | TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS) | |
1193 | { | |
1194 | pid_t parent; | |
1195 | long ret; | |
1196 | ||
1197 | parent = getppid(); | |
1198 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1199 | ASSERT_EQ(0, ret); | |
1200 | ||
1201 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1202 | ASSERT_EQ(0, ret); | |
1203 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1204 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1205 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1206 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1207 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1208 | ASSERT_EQ(0, ret); | |
1209 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1210 | ASSERT_EQ(0, ret); | |
1211 | /* Should work just fine. */ | |
1212 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1213 | /* getpid() should never return. */ | |
1214 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1215 | } | |
1216 | ||
1217 | TEST_F(precedence, errno_is_third) | |
1218 | { | |
1219 | pid_t parent; | |
1220 | long ret; | |
1221 | ||
1222 | parent = getppid(); | |
1223 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1224 | ASSERT_EQ(0, ret); | |
1225 | ||
1226 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1227 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1228 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1229 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1230 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1231 | ASSERT_EQ(0, ret); | |
1232 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1233 | ASSERT_EQ(0, ret); | |
1234 | /* Should work just fine. */ | |
1235 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1236 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1237 | } | |
1238 | ||
1239 | TEST_F(precedence, errno_is_third_in_any_order) | |
1240 | { | |
1241 | pid_t parent; | |
1242 | long ret; | |
1243 | ||
1244 | parent = getppid(); | |
1245 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1246 | ASSERT_EQ(0, ret); | |
1247 | ||
59f5cf44 TH |
1248 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1249 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1250 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); |
1251 | ASSERT_EQ(0, ret); | |
1252 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
1253 | ASSERT_EQ(0, ret); | |
1254 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1255 | ASSERT_EQ(0, ret); | |
1256 | /* Should work just fine. */ | |
1257 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1258 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1259 | } | |
1260 | ||
1261 | TEST_F(precedence, trace_is_fourth) | |
1262 | { | |
1263 | pid_t parent; | |
1264 | long ret; | |
1265 | ||
1266 | parent = getppid(); | |
1267 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1268 | ASSERT_EQ(0, ret); | |
1269 | ||
1270 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1271 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1272 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1273 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1274 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1275 | ASSERT_EQ(0, ret); | |
1276 | /* Should work just fine. */ | |
1277 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1278 | /* No ptracer */ | |
1279 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1280 | } | |
1281 | ||
1282 | TEST_F(precedence, trace_is_fourth_in_any_order) | |
1283 | { | |
1284 | pid_t parent; | |
1285 | long ret; | |
1286 | ||
1287 | parent = getppid(); | |
1288 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1289 | ASSERT_EQ(0, ret); | |
1290 | ||
1291 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
1292 | ASSERT_EQ(0, ret); | |
1293 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1294 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1295 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1296 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1297 | /* Should work just fine. */ |
1298 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1299 | /* No ptracer */ | |
1300 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1301 | } | |
1302 | ||
59f5cf44 TH |
1303 | TEST_F(precedence, log_is_fifth) |
1304 | { | |
1305 | pid_t mypid, parent; | |
1306 | long ret; | |
1307 | ||
1308 | mypid = getpid(); | |
1309 | parent = getppid(); | |
1310 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1311 | ASSERT_EQ(0, ret); | |
1312 | ||
1313 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1314 | ASSERT_EQ(0, ret); | |
1315 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); | |
1316 | ASSERT_EQ(0, ret); | |
1317 | /* Should work just fine. */ | |
1318 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1319 | /* Should also work just fine */ | |
1320 | EXPECT_EQ(mypid, syscall(__NR_getpid)); | |
1321 | } | |
1322 | ||
1323 | TEST_F(precedence, log_is_fifth_in_any_order) | |
1324 | { | |
1325 | pid_t mypid, parent; | |
1326 | long ret; | |
1327 | ||
1328 | mypid = getpid(); | |
1329 | parent = getppid(); | |
1330 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1331 | ASSERT_EQ(0, ret); | |
1332 | ||
1333 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); | |
1334 | ASSERT_EQ(0, ret); | |
1335 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1336 | ASSERT_EQ(0, ret); | |
1337 | /* Should work just fine. */ | |
1338 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1339 | /* Should also work just fine */ | |
1340 | EXPECT_EQ(mypid, syscall(__NR_getpid)); | |
1341 | } | |
1342 | ||
c99ee51a KC |
1343 | #ifndef PTRACE_O_TRACESECCOMP |
1344 | #define PTRACE_O_TRACESECCOMP 0x00000080 | |
1345 | #endif | |
1346 | ||
1347 | /* Catch the Ubuntu 12.04 value error. */ | |
1348 | #if PTRACE_EVENT_SECCOMP != 7 | |
1349 | #undef PTRACE_EVENT_SECCOMP | |
1350 | #endif | |
1351 | ||
1352 | #ifndef PTRACE_EVENT_SECCOMP | |
1353 | #define PTRACE_EVENT_SECCOMP 7 | |
1354 | #endif | |
1355 | ||
1356 | #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP) | |
1357 | bool tracer_running; | |
1358 | void tracer_stop(int sig) | |
1359 | { | |
1360 | tracer_running = false; | |
1361 | } | |
1362 | ||
1363 | typedef void tracer_func_t(struct __test_metadata *_metadata, | |
1364 | pid_t tracee, int status, void *args); | |
1365 | ||
58d0a862 KC |
1366 | void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee, |
1367 | tracer_func_t tracer_func, void *args, bool ptrace_syscall) | |
c99ee51a KC |
1368 | { |
1369 | int ret = -1; | |
1370 | struct sigaction action = { | |
1371 | .sa_handler = tracer_stop, | |
1372 | }; | |
1373 | ||
1374 | /* Allow external shutdown. */ | |
1375 | tracer_running = true; | |
1376 | ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL)); | |
1377 | ||
1378 | errno = 0; | |
1379 | while (ret == -1 && errno != EINVAL) | |
1380 | ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0); | |
1381 | ASSERT_EQ(0, ret) { | |
1382 | kill(tracee, SIGKILL); | |
1383 | } | |
1384 | /* Wait for attach stop */ | |
1385 | wait(NULL); | |
1386 | ||
58d0a862 KC |
1387 | ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ? |
1388 | PTRACE_O_TRACESYSGOOD : | |
1389 | PTRACE_O_TRACESECCOMP); | |
c99ee51a KC |
1390 | ASSERT_EQ(0, ret) { |
1391 | TH_LOG("Failed to set PTRACE_O_TRACESECCOMP"); | |
1392 | kill(tracee, SIGKILL); | |
1393 | } | |
58d0a862 KC |
1394 | ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT, |
1395 | tracee, NULL, 0); | |
1396 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1397 | |
1398 | /* Unblock the tracee */ | |
1399 | ASSERT_EQ(1, write(fd, "A", 1)); | |
1400 | ASSERT_EQ(0, close(fd)); | |
1401 | ||
1402 | /* Run until we're shut down. Must assert to stop execution. */ | |
1403 | while (tracer_running) { | |
1404 | int status; | |
1405 | ||
1406 | if (wait(&status) != tracee) | |
1407 | continue; | |
1408 | if (WIFSIGNALED(status) || WIFEXITED(status)) | |
1409 | /* Child is dead. Time to go. */ | |
1410 | return; | |
1411 | ||
58d0a862 KC |
1412 | /* Check if this is a seccomp event. */ |
1413 | ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status)); | |
c99ee51a KC |
1414 | |
1415 | tracer_func(_metadata, tracee, status, args); | |
1416 | ||
58d0a862 KC |
1417 | ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT, |
1418 | tracee, NULL, 0); | |
c99ee51a KC |
1419 | ASSERT_EQ(0, ret); |
1420 | } | |
1421 | /* Directly report the status of our test harness results. */ | |
1422 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); | |
1423 | } | |
1424 | ||
1425 | /* Common tracer setup/teardown functions. */ | |
1426 | void cont_handler(int num) | |
1427 | { } | |
1428 | pid_t setup_trace_fixture(struct __test_metadata *_metadata, | |
58d0a862 | 1429 | tracer_func_t func, void *args, bool ptrace_syscall) |
c99ee51a KC |
1430 | { |
1431 | char sync; | |
1432 | int pipefd[2]; | |
1433 | pid_t tracer_pid; | |
1434 | pid_t tracee = getpid(); | |
1435 | ||
1436 | /* Setup a pipe for clean synchronization. */ | |
1437 | ASSERT_EQ(0, pipe(pipefd)); | |
1438 | ||
1439 | /* Fork a child which we'll promote to tracer */ | |
1440 | tracer_pid = fork(); | |
1441 | ASSERT_LE(0, tracer_pid); | |
1442 | signal(SIGALRM, cont_handler); | |
1443 | if (tracer_pid == 0) { | |
1444 | close(pipefd[0]); | |
58d0a862 KC |
1445 | start_tracer(_metadata, pipefd[1], tracee, func, args, |
1446 | ptrace_syscall); | |
c99ee51a KC |
1447 | syscall(__NR_exit, 0); |
1448 | } | |
1449 | close(pipefd[1]); | |
1450 | prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0); | |
1451 | read(pipefd[0], &sync, 1); | |
1452 | close(pipefd[0]); | |
1453 | ||
1454 | return tracer_pid; | |
1455 | } | |
1456 | void teardown_trace_fixture(struct __test_metadata *_metadata, | |
1457 | pid_t tracer) | |
1458 | { | |
1459 | if (tracer) { | |
1460 | int status; | |
1461 | /* | |
1462 | * Extract the exit code from the other process and | |
1463 | * adopt it for ourselves in case its asserts failed. | |
1464 | */ | |
1465 | ASSERT_EQ(0, kill(tracer, SIGUSR1)); | |
1466 | ASSERT_EQ(tracer, waitpid(tracer, &status, 0)); | |
1467 | if (WEXITSTATUS(status)) | |
1468 | _metadata->passed = 0; | |
1469 | } | |
1470 | } | |
1471 | ||
1472 | /* "poke" tracer arguments and function. */ | |
1473 | struct tracer_args_poke_t { | |
1474 | unsigned long poke_addr; | |
1475 | }; | |
1476 | ||
1477 | void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status, | |
1478 | void *args) | |
1479 | { | |
1480 | int ret; | |
1481 | unsigned long msg; | |
1482 | struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args; | |
1483 | ||
1484 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1485 | EXPECT_EQ(0, ret); | |
1486 | /* If this fails, don't try to recover. */ | |
1487 | ASSERT_EQ(0x1001, msg) { | |
1488 | kill(tracee, SIGKILL); | |
1489 | } | |
1490 | /* | |
1491 | * Poke in the message. | |
1492 | * Registers are not touched to try to keep this relatively arch | |
1493 | * agnostic. | |
1494 | */ | |
1495 | ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001); | |
1496 | EXPECT_EQ(0, ret); | |
1497 | } | |
1498 | ||
1499 | FIXTURE_DATA(TRACE_poke) { | |
1500 | struct sock_fprog prog; | |
1501 | pid_t tracer; | |
1502 | long poked; | |
1503 | struct tracer_args_poke_t tracer_args; | |
1504 | }; | |
1505 | ||
1506 | FIXTURE_SETUP(TRACE_poke) | |
1507 | { | |
1508 | struct sock_filter filter[] = { | |
1509 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1510 | offsetof(struct seccomp_data, nr)), | |
1511 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
1512 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001), | |
1513 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1514 | }; | |
1515 | ||
1516 | self->poked = 0; | |
1517 | memset(&self->prog, 0, sizeof(self->prog)); | |
1518 | self->prog.filter = malloc(sizeof(filter)); | |
1519 | ASSERT_NE(NULL, self->prog.filter); | |
1520 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1521 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1522 | ||
1523 | /* Set up tracer args. */ | |
1524 | self->tracer_args.poke_addr = (unsigned long)&self->poked; | |
1525 | ||
1526 | /* Launch tracer. */ | |
1527 | self->tracer = setup_trace_fixture(_metadata, tracer_poke, | |
58d0a862 | 1528 | &self->tracer_args, false); |
c99ee51a KC |
1529 | } |
1530 | ||
1531 | FIXTURE_TEARDOWN(TRACE_poke) | |
1532 | { | |
1533 | teardown_trace_fixture(_metadata, self->tracer); | |
1534 | if (self->prog.filter) | |
1535 | free(self->prog.filter); | |
1536 | } | |
1537 | ||
1538 | TEST_F(TRACE_poke, read_has_side_effects) | |
1539 | { | |
1540 | ssize_t ret; | |
1541 | ||
1542 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1543 | ASSERT_EQ(0, ret); | |
1544 | ||
1545 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1546 | ASSERT_EQ(0, ret); | |
1547 | ||
1548 | EXPECT_EQ(0, self->poked); | |
1549 | ret = read(-1, NULL, 0); | |
1550 | EXPECT_EQ(-1, ret); | |
1551 | EXPECT_EQ(0x1001, self->poked); | |
1552 | } | |
1553 | ||
1554 | TEST_F(TRACE_poke, getpid_runs_normally) | |
1555 | { | |
1556 | long ret; | |
1557 | ||
1558 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1559 | ASSERT_EQ(0, ret); | |
1560 | ||
1561 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1562 | ASSERT_EQ(0, ret); | |
1563 | ||
1564 | EXPECT_EQ(0, self->poked); | |
1565 | EXPECT_NE(0, syscall(__NR_getpid)); | |
1566 | EXPECT_EQ(0, self->poked); | |
1567 | } | |
1568 | ||
1569 | #if defined(__x86_64__) | |
1570 | # define ARCH_REGS struct user_regs_struct | |
1571 | # define SYSCALL_NUM orig_rax | |
1572 | # define SYSCALL_RET rax | |
1573 | #elif defined(__i386__) | |
1574 | # define ARCH_REGS struct user_regs_struct | |
1575 | # define SYSCALL_NUM orig_eax | |
1576 | # define SYSCALL_RET eax | |
1577 | #elif defined(__arm__) | |
1578 | # define ARCH_REGS struct pt_regs | |
1579 | # define SYSCALL_NUM ARM_r7 | |
1580 | # define SYSCALL_RET ARM_r0 | |
1581 | #elif defined(__aarch64__) | |
1582 | # define ARCH_REGS struct user_pt_regs | |
1583 | # define SYSCALL_NUM regs[8] | |
1584 | # define SYSCALL_RET regs[0] | |
64e2a42b HD |
1585 | #elif defined(__hppa__) |
1586 | # define ARCH_REGS struct user_regs_struct | |
1587 | # define SYSCALL_NUM gr[20] | |
1588 | # define SYSCALL_RET gr[28] | |
5d83c2b3 ME |
1589 | #elif defined(__powerpc__) |
1590 | # define ARCH_REGS struct pt_regs | |
1591 | # define SYSCALL_NUM gpr[0] | |
1592 | # define SYSCALL_RET gpr[3] | |
b623c4da KC |
1593 | #elif defined(__s390__) |
1594 | # define ARCH_REGS s390_regs | |
1595 | # define SYSCALL_NUM gprs[2] | |
1596 | # define SYSCALL_RET gprs[2] | |
0ce105bf MR |
1597 | #elif defined(__mips__) |
1598 | # define ARCH_REGS struct pt_regs | |
1599 | # define SYSCALL_NUM regs[2] | |
1600 | # define SYSCALL_SYSCALL_NUM regs[4] | |
1601 | # define SYSCALL_RET regs[2] | |
1602 | # define SYSCALL_NUM_RET_SHARE_REG | |
c99ee51a KC |
1603 | #else |
1604 | # error "Do not know how to find your architecture's registers and syscalls" | |
1605 | #endif | |
1606 | ||
a33b2d03 KC |
1607 | /* When the syscall return can't be changed, stub out the tests for it. */ |
1608 | #ifdef SYSCALL_NUM_RET_SHARE_REG | |
1609 | # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action) | |
1610 | #else | |
ed5f1326 KC |
1611 | # define EXPECT_SYSCALL_RETURN(val, action) \ |
1612 | do { \ | |
1613 | errno = 0; \ | |
1614 | if (val < 0) { \ | |
1615 | EXPECT_EQ(-1, action); \ | |
1616 | EXPECT_EQ(-(val), errno); \ | |
1617 | } else { \ | |
1618 | EXPECT_EQ(val, action); \ | |
1619 | } \ | |
1620 | } while (0) | |
a33b2d03 KC |
1621 | #endif |
1622 | ||
4a0b8807 MS |
1623 | /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for |
1624 | * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux). | |
1625 | */ | |
0ce105bf | 1626 | #if defined(__x86_64__) || defined(__i386__) || defined(__mips__) |
4a0b8807 MS |
1627 | #define HAVE_GETREGS |
1628 | #endif | |
1629 | ||
c99ee51a KC |
1630 | /* Architecture-specific syscall fetching routine. */ |
1631 | int get_syscall(struct __test_metadata *_metadata, pid_t tracee) | |
1632 | { | |
c99ee51a | 1633 | ARCH_REGS regs; |
4a0b8807 MS |
1634 | #ifdef HAVE_GETREGS |
1635 | EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, ®s)) { | |
1636 | TH_LOG("PTRACE_GETREGS failed"); | |
1637 | return -1; | |
1638 | } | |
1639 | #else | |
1640 | struct iovec iov; | |
c99ee51a KC |
1641 | |
1642 | iov.iov_base = ®s; | |
1643 | iov.iov_len = sizeof(regs); | |
1644 | EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) { | |
1645 | TH_LOG("PTRACE_GETREGSET failed"); | |
1646 | return -1; | |
1647 | } | |
4a0b8807 | 1648 | #endif |
c99ee51a | 1649 | |
0ce105bf MR |
1650 | #if defined(__mips__) |
1651 | if (regs.SYSCALL_NUM == __NR_O32_Linux) | |
1652 | return regs.SYSCALL_SYSCALL_NUM; | |
1653 | #endif | |
c99ee51a KC |
1654 | return regs.SYSCALL_NUM; |
1655 | } | |
1656 | ||
1657 | /* Architecture-specific syscall changing routine. */ | |
1658 | void change_syscall(struct __test_metadata *_metadata, | |
ed5f1326 | 1659 | pid_t tracee, int syscall, int result) |
c99ee51a | 1660 | { |
c99ee51a KC |
1661 | int ret; |
1662 | ARCH_REGS regs; | |
4a0b8807 MS |
1663 | #ifdef HAVE_GETREGS |
1664 | ret = ptrace(PTRACE_GETREGS, tracee, 0, ®s); | |
1665 | #else | |
1666 | struct iovec iov; | |
c99ee51a KC |
1667 | iov.iov_base = ®s; |
1668 | iov.iov_len = sizeof(regs); | |
1669 | ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov); | |
4a0b8807 | 1670 | #endif |
34a048cc | 1671 | EXPECT_EQ(0, ret) {} |
c99ee51a | 1672 | |
256d0afb | 1673 | #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \ |
64e2a42b | 1674 | defined(__s390__) || defined(__hppa__) |
c99ee51a KC |
1675 | { |
1676 | regs.SYSCALL_NUM = syscall; | |
1677 | } | |
0ce105bf MR |
1678 | #elif defined(__mips__) |
1679 | { | |
1680 | if (regs.SYSCALL_NUM == __NR_O32_Linux) | |
1681 | regs.SYSCALL_SYSCALL_NUM = syscall; | |
1682 | else | |
1683 | regs.SYSCALL_NUM = syscall; | |
1684 | } | |
c99ee51a KC |
1685 | |
1686 | #elif defined(__arm__) | |
1687 | # ifndef PTRACE_SET_SYSCALL | |
1688 | # define PTRACE_SET_SYSCALL 23 | |
1689 | # endif | |
1690 | { | |
1691 | ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall); | |
1692 | EXPECT_EQ(0, ret); | |
1693 | } | |
1694 | ||
256d0afb KC |
1695 | #elif defined(__aarch64__) |
1696 | # ifndef NT_ARM_SYSTEM_CALL | |
1697 | # define NT_ARM_SYSTEM_CALL 0x404 | |
1698 | # endif | |
1699 | { | |
1700 | iov.iov_base = &syscall; | |
1701 | iov.iov_len = sizeof(syscall); | |
1702 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL, | |
1703 | &iov); | |
1704 | EXPECT_EQ(0, ret); | |
1705 | } | |
1706 | ||
c99ee51a KC |
1707 | #else |
1708 | ASSERT_EQ(1, 0) { | |
1709 | TH_LOG("How is the syscall changed on this architecture?"); | |
1710 | } | |
1711 | #endif | |
1712 | ||
1713 | /* If syscall is skipped, change return value. */ | |
1714 | if (syscall == -1) | |
0ce105bf MR |
1715 | #ifdef SYSCALL_NUM_RET_SHARE_REG |
1716 | TH_LOG("Can't modify syscall return on this architecture"); | |
1717 | #else | |
ed5f1326 | 1718 | regs.SYSCALL_RET = result; |
0ce105bf | 1719 | #endif |
c99ee51a | 1720 | |
4a0b8807 MS |
1721 | #ifdef HAVE_GETREGS |
1722 | ret = ptrace(PTRACE_SETREGS, tracee, 0, ®s); | |
1723 | #else | |
256d0afb KC |
1724 | iov.iov_base = ®s; |
1725 | iov.iov_len = sizeof(regs); | |
c99ee51a | 1726 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov); |
4a0b8807 | 1727 | #endif |
c99ee51a KC |
1728 | EXPECT_EQ(0, ret); |
1729 | } | |
1730 | ||
1731 | void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee, | |
1732 | int status, void *args) | |
1733 | { | |
1734 | int ret; | |
1735 | unsigned long msg; | |
1736 | ||
1737 | /* Make sure we got the right message. */ | |
1738 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1739 | EXPECT_EQ(0, ret); | |
1740 | ||
b623c4da | 1741 | /* Validate and take action on expected syscalls. */ |
c99ee51a KC |
1742 | switch (msg) { |
1743 | case 0x1002: | |
1744 | /* change getpid to getppid. */ | |
b623c4da | 1745 | EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee)); |
ed5f1326 | 1746 | change_syscall(_metadata, tracee, __NR_getppid, 0); |
c99ee51a KC |
1747 | break; |
1748 | case 0x1003: | |
ed5f1326 | 1749 | /* skip gettid with valid return code. */ |
b623c4da | 1750 | EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee)); |
ed5f1326 | 1751 | change_syscall(_metadata, tracee, -1, 45000); |
c99ee51a KC |
1752 | break; |
1753 | case 0x1004: | |
ed5f1326 KC |
1754 | /* skip openat with error. */ |
1755 | EXPECT_EQ(__NR_openat, get_syscall(_metadata, tracee)); | |
1756 | change_syscall(_metadata, tracee, -1, -ESRCH); | |
1757 | break; | |
1758 | case 0x1005: | |
c99ee51a | 1759 | /* do nothing (allow getppid) */ |
b623c4da | 1760 | EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1761 | break; |
1762 | default: | |
1763 | EXPECT_EQ(0, msg) { | |
1764 | TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg); | |
1765 | kill(tracee, SIGKILL); | |
1766 | } | |
1767 | } | |
1768 | ||
1769 | } | |
1770 | ||
58d0a862 KC |
1771 | void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee, |
1772 | int status, void *args) | |
1773 | { | |
1774 | int ret, nr; | |
1775 | unsigned long msg; | |
1776 | static bool entry; | |
1777 | ||
1778 | /* Make sure we got an empty message. */ | |
1779 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1780 | EXPECT_EQ(0, ret); | |
1781 | EXPECT_EQ(0, msg); | |
1782 | ||
1783 | /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */ | |
1784 | entry = !entry; | |
1785 | if (!entry) | |
1786 | return; | |
1787 | ||
1788 | nr = get_syscall(_metadata, tracee); | |
1789 | ||
1790 | if (nr == __NR_getpid) | |
ed5f1326 KC |
1791 | change_syscall(_metadata, tracee, __NR_getppid, 0); |
1792 | if (nr == __NR_gettid) | |
1793 | change_syscall(_metadata, tracee, -1, 45000); | |
912ec316 | 1794 | if (nr == __NR_openat) |
ed5f1326 | 1795 | change_syscall(_metadata, tracee, -1, -ESRCH); |
58d0a862 KC |
1796 | } |
1797 | ||
c99ee51a KC |
1798 | FIXTURE_DATA(TRACE_syscall) { |
1799 | struct sock_fprog prog; | |
1800 | pid_t tracer, mytid, mypid, parent; | |
1801 | }; | |
1802 | ||
1803 | FIXTURE_SETUP(TRACE_syscall) | |
1804 | { | |
1805 | struct sock_filter filter[] = { | |
1806 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1807 | offsetof(struct seccomp_data, nr)), | |
1808 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
1809 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002), | |
1810 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1), | |
1811 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003), | |
ed5f1326 | 1812 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_openat, 0, 1), |
c99ee51a | 1813 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004), |
ed5f1326 KC |
1814 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), |
1815 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1005), | |
c99ee51a KC |
1816 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
1817 | }; | |
1818 | ||
1819 | memset(&self->prog, 0, sizeof(self->prog)); | |
1820 | self->prog.filter = malloc(sizeof(filter)); | |
1821 | ASSERT_NE(NULL, self->prog.filter); | |
1822 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1823 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1824 | ||
1825 | /* Prepare some testable syscall results. */ | |
1826 | self->mytid = syscall(__NR_gettid); | |
1827 | ASSERT_GT(self->mytid, 0); | |
1828 | ASSERT_NE(self->mytid, 1) { | |
1829 | TH_LOG("Running this test as init is not supported. :)"); | |
1830 | } | |
1831 | ||
1832 | self->mypid = getpid(); | |
1833 | ASSERT_GT(self->mypid, 0); | |
1834 | ASSERT_EQ(self->mytid, self->mypid); | |
1835 | ||
1836 | self->parent = getppid(); | |
1837 | ASSERT_GT(self->parent, 0); | |
1838 | ASSERT_NE(self->parent, self->mypid); | |
1839 | ||
1840 | /* Launch tracer. */ | |
58d0a862 KC |
1841 | self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL, |
1842 | false); | |
c99ee51a KC |
1843 | } |
1844 | ||
1845 | FIXTURE_TEARDOWN(TRACE_syscall) | |
1846 | { | |
1847 | teardown_trace_fixture(_metadata, self->tracer); | |
1848 | if (self->prog.filter) | |
1849 | free(self->prog.filter); | |
1850 | } | |
1851 | ||
a33b2d03 KC |
1852 | TEST_F(TRACE_syscall, ptrace_syscall_redirected) |
1853 | { | |
1854 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1855 | teardown_trace_fixture(_metadata, self->tracer); | |
1856 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1857 | true); | |
1858 | ||
1859 | /* Tracer will redirect getpid to getppid. */ | |
1860 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1861 | } | |
1862 | ||
ed5f1326 KC |
1863 | TEST_F(TRACE_syscall, ptrace_syscall_errno) |
1864 | { | |
1865 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1866 | teardown_trace_fixture(_metadata, self->tracer); | |
1867 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1868 | true); | |
1869 | ||
1870 | /* Tracer should skip the open syscall, resulting in ESRCH. */ | |
1871 | EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat)); | |
1872 | } | |
1873 | ||
1874 | TEST_F(TRACE_syscall, ptrace_syscall_faked) | |
a33b2d03 KC |
1875 | { |
1876 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1877 | teardown_trace_fixture(_metadata, self->tracer); | |
1878 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1879 | true); | |
1880 | ||
ed5f1326 KC |
1881 | /* Tracer should skip the gettid syscall, resulting fake pid. */ |
1882 | EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid)); | |
a33b2d03 KC |
1883 | } |
1884 | ||
c99ee51a KC |
1885 | TEST_F(TRACE_syscall, syscall_allowed) |
1886 | { | |
1887 | long ret; | |
1888 | ||
1889 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1890 | ASSERT_EQ(0, ret); | |
1891 | ||
1892 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1893 | ASSERT_EQ(0, ret); | |
1894 | ||
1895 | /* getppid works as expected (no changes). */ | |
1896 | EXPECT_EQ(self->parent, syscall(__NR_getppid)); | |
1897 | EXPECT_NE(self->mypid, syscall(__NR_getppid)); | |
1898 | } | |
1899 | ||
1900 | TEST_F(TRACE_syscall, syscall_redirected) | |
1901 | { | |
1902 | long ret; | |
1903 | ||
1904 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1905 | ASSERT_EQ(0, ret); | |
1906 | ||
1907 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1908 | ASSERT_EQ(0, ret); | |
1909 | ||
1910 | /* getpid has been redirected to getppid as expected. */ | |
1911 | EXPECT_EQ(self->parent, syscall(__NR_getpid)); | |
1912 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1913 | } | |
1914 | ||
ed5f1326 KC |
1915 | TEST_F(TRACE_syscall, syscall_errno) |
1916 | { | |
1917 | long ret; | |
1918 | ||
1919 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1920 | ASSERT_EQ(0, ret); | |
1921 | ||
1922 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1923 | ASSERT_EQ(0, ret); | |
1924 | ||
1925 | /* openat has been skipped and an errno return. */ | |
1926 | EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat)); | |
1927 | } | |
1928 | ||
1929 | TEST_F(TRACE_syscall, syscall_faked) | |
c99ee51a KC |
1930 | { |
1931 | long ret; | |
1932 | ||
1933 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1934 | ASSERT_EQ(0, ret); | |
1935 | ||
1936 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1937 | ASSERT_EQ(0, ret); | |
1938 | ||
1939 | /* gettid has been skipped and an altered return value stored. */ | |
ed5f1326 | 1940 | EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid)); |
c99ee51a KC |
1941 | } |
1942 | ||
58d0a862 KC |
1943 | TEST_F(TRACE_syscall, skip_after_RET_TRACE) |
1944 | { | |
1945 | struct sock_filter filter[] = { | |
1946 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1947 | offsetof(struct seccomp_data, nr)), | |
1948 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1949 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM), | |
1950 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1951 | }; | |
1952 | struct sock_fprog prog = { | |
1953 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1954 | .filter = filter, | |
1955 | }; | |
1956 | long ret; | |
1957 | ||
1958 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1959 | ASSERT_EQ(0, ret); | |
1960 | ||
1961 | /* Install fixture filter. */ | |
1962 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1963 | ASSERT_EQ(0, ret); | |
1964 | ||
1965 | /* Install "errno on getppid" filter. */ | |
1966 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1967 | ASSERT_EQ(0, ret); | |
1968 | ||
1969 | /* Tracer will redirect getpid to getppid, and we should see EPERM. */ | |
a33b2d03 | 1970 | errno = 0; |
58d0a862 KC |
1971 | EXPECT_EQ(-1, syscall(__NR_getpid)); |
1972 | EXPECT_EQ(EPERM, errno); | |
1973 | } | |
1974 | ||
1975 | TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS) | |
1976 | { | |
1977 | struct sock_filter filter[] = { | |
1978 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1979 | offsetof(struct seccomp_data, nr)), | |
1980 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1981 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1982 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1983 | }; | |
1984 | struct sock_fprog prog = { | |
1985 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1986 | .filter = filter, | |
1987 | }; | |
1988 | long ret; | |
1989 | ||
1990 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1991 | ASSERT_EQ(0, ret); | |
1992 | ||
1993 | /* Install fixture filter. */ | |
1994 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1995 | ASSERT_EQ(0, ret); | |
1996 | ||
1997 | /* Install "death on getppid" filter. */ | |
1998 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1999 | ASSERT_EQ(0, ret); | |
2000 | ||
2001 | /* Tracer will redirect getpid to getppid, and we should die. */ | |
2002 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
2003 | } | |
2004 | ||
2005 | TEST_F(TRACE_syscall, skip_after_ptrace) | |
2006 | { | |
2007 | struct sock_filter filter[] = { | |
2008 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2009 | offsetof(struct seccomp_data, nr)), | |
2010 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
2011 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM), | |
2012 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2013 | }; | |
2014 | struct sock_fprog prog = { | |
2015 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2016 | .filter = filter, | |
2017 | }; | |
2018 | long ret; | |
2019 | ||
2020 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
2021 | teardown_trace_fixture(_metadata, self->tracer); | |
2022 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
2023 | true); | |
2024 | ||
2025 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
2026 | ASSERT_EQ(0, ret); | |
2027 | ||
2028 | /* Install "errno on getppid" filter. */ | |
2029 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
2030 | ASSERT_EQ(0, ret); | |
2031 | ||
2032 | /* Tracer will redirect getpid to getppid, and we should see EPERM. */ | |
2033 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
2034 | EXPECT_EQ(EPERM, errno); | |
2035 | } | |
2036 | ||
2037 | TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS) | |
2038 | { | |
2039 | struct sock_filter filter[] = { | |
2040 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2041 | offsetof(struct seccomp_data, nr)), | |
2042 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
2043 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
2044 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2045 | }; | |
2046 | struct sock_fprog prog = { | |
2047 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2048 | .filter = filter, | |
2049 | }; | |
2050 | long ret; | |
2051 | ||
2052 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
2053 | teardown_trace_fixture(_metadata, self->tracer); | |
2054 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
2055 | true); | |
2056 | ||
2057 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
2058 | ASSERT_EQ(0, ret); | |
2059 | ||
2060 | /* Install "death on getppid" filter. */ | |
2061 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
2062 | ASSERT_EQ(0, ret); | |
2063 | ||
2064 | /* Tracer will redirect getpid to getppid, and we should die. */ | |
2065 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
2066 | } | |
2067 | ||
c99ee51a KC |
2068 | TEST(seccomp_syscall) |
2069 | { | |
2070 | struct sock_filter filter[] = { | |
2071 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2072 | }; | |
2073 | struct sock_fprog prog = { | |
2074 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2075 | .filter = filter, | |
2076 | }; | |
2077 | long ret; | |
2078 | ||
2079 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
2080 | ASSERT_EQ(0, ret) { | |
2081 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2082 | } | |
2083 | ||
2084 | /* Reject insane operation. */ | |
2085 | ret = seccomp(-1, 0, &prog); | |
b623c4da KC |
2086 | ASSERT_NE(ENOSYS, errno) { |
2087 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2088 | } | |
c99ee51a KC |
2089 | EXPECT_EQ(EINVAL, errno) { |
2090 | TH_LOG("Did not reject crazy op value!"); | |
2091 | } | |
2092 | ||
2093 | /* Reject strict with flags or pointer. */ | |
2094 | ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL); | |
2095 | EXPECT_EQ(EINVAL, errno) { | |
2096 | TH_LOG("Did not reject mode strict with flags!"); | |
2097 | } | |
2098 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog); | |
2099 | EXPECT_EQ(EINVAL, errno) { | |
2100 | TH_LOG("Did not reject mode strict with uargs!"); | |
2101 | } | |
2102 | ||
2103 | /* Reject insane args for filter. */ | |
2104 | ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog); | |
2105 | EXPECT_EQ(EINVAL, errno) { | |
2106 | TH_LOG("Did not reject crazy filter flags!"); | |
2107 | } | |
2108 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL); | |
2109 | EXPECT_EQ(EFAULT, errno) { | |
2110 | TH_LOG("Did not reject NULL filter!"); | |
2111 | } | |
2112 | ||
2113 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
2114 | EXPECT_EQ(0, errno) { | |
2115 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s", | |
2116 | strerror(errno)); | |
2117 | } | |
2118 | } | |
2119 | ||
2120 | TEST(seccomp_syscall_mode_lock) | |
2121 | { | |
2122 | struct sock_filter filter[] = { | |
2123 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2124 | }; | |
2125 | struct sock_fprog prog = { | |
2126 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2127 | .filter = filter, | |
2128 | }; | |
2129 | long ret; | |
2130 | ||
2131 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
2132 | ASSERT_EQ(0, ret) { | |
2133 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2134 | } | |
2135 | ||
2136 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
2137 | ASSERT_NE(ENOSYS, errno) { |
2138 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2139 | } | |
c99ee51a KC |
2140 | EXPECT_EQ(0, ret) { |
2141 | TH_LOG("Could not install filter!"); | |
2142 | } | |
2143 | ||
2144 | /* Make sure neither entry point will switch to strict. */ | |
2145 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0); | |
2146 | EXPECT_EQ(EINVAL, errno) { | |
2147 | TH_LOG("Switched to mode strict!"); | |
2148 | } | |
2149 | ||
2150 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL); | |
2151 | EXPECT_EQ(EINVAL, errno) { | |
2152 | TH_LOG("Switched to mode strict!"); | |
2153 | } | |
2154 | } | |
2155 | ||
2b7ea5b5 TH |
2156 | /* |
2157 | * Test detection of known and unknown filter flags. Userspace needs to be able | |
2158 | * to check if a filter flag is supported by the current kernel and a good way | |
2159 | * of doing that is by attempting to enter filter mode, with the flag bit in | |
2160 | * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates | |
2161 | * that the flag is valid and EINVAL indicates that the flag is invalid. | |
2162 | */ | |
2163 | TEST(detect_seccomp_filter_flags) | |
2164 | { | |
e66a3997 | 2165 | unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC, |
00a02d0c | 2166 | SECCOMP_FILTER_FLAG_LOG, |
6a21cc50 TA |
2167 | SECCOMP_FILTER_FLAG_SPEC_ALLOW, |
2168 | SECCOMP_FILTER_FLAG_NEW_LISTENER }; | |
2b7ea5b5 TH |
2169 | unsigned int flag, all_flags; |
2170 | int i; | |
2171 | long ret; | |
2172 | ||
2173 | /* Test detection of known-good filter flags */ | |
2174 | for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) { | |
00a02d0c KC |
2175 | int bits = 0; |
2176 | ||
2b7ea5b5 | 2177 | flag = flags[i]; |
00a02d0c KC |
2178 | /* Make sure the flag is a single bit! */ |
2179 | while (flag) { | |
2180 | if (flag & 0x1) | |
2181 | bits ++; | |
2182 | flag >>= 1; | |
2183 | } | |
2184 | ASSERT_EQ(1, bits); | |
2185 | flag = flags[i]; | |
2186 | ||
2b7ea5b5 TH |
2187 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); |
2188 | ASSERT_NE(ENOSYS, errno) { | |
2189 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2190 | } | |
2191 | EXPECT_EQ(-1, ret); | |
2192 | EXPECT_EQ(EFAULT, errno) { | |
2193 | TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!", | |
2194 | flag); | |
2195 | } | |
2196 | ||
2197 | all_flags |= flag; | |
2198 | } | |
2199 | ||
2200 | /* Test detection of all known-good filter flags */ | |
2201 | ret = seccomp(SECCOMP_SET_MODE_FILTER, all_flags, NULL); | |
2202 | EXPECT_EQ(-1, ret); | |
2203 | EXPECT_EQ(EFAULT, errno) { | |
2204 | TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!", | |
2205 | all_flags); | |
2206 | } | |
2207 | ||
2208 | /* Test detection of an unknown filter flag */ | |
2209 | flag = -1; | |
2210 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
2211 | EXPECT_EQ(-1, ret); | |
2212 | EXPECT_EQ(EINVAL, errno) { | |
2213 | TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!", | |
2214 | flag); | |
2215 | } | |
2216 | ||
2217 | /* | |
2218 | * Test detection of an unknown filter flag that may simply need to be | |
2219 | * added to this test | |
2220 | */ | |
2221 | flag = flags[ARRAY_SIZE(flags) - 1] << 1; | |
2222 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
2223 | EXPECT_EQ(-1, ret); | |
2224 | EXPECT_EQ(EINVAL, errno) { | |
2225 | TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported! Does a new flag need to be added to this test?", | |
2226 | flag); | |
2227 | } | |
2228 | } | |
2229 | ||
c99ee51a KC |
2230 | TEST(TSYNC_first) |
2231 | { | |
2232 | struct sock_filter filter[] = { | |
2233 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2234 | }; | |
2235 | struct sock_fprog prog = { | |
2236 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2237 | .filter = filter, | |
2238 | }; | |
2239 | long ret; | |
2240 | ||
2241 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
2242 | ASSERT_EQ(0, ret) { | |
2243 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2244 | } | |
2245 | ||
6c045d07 | 2246 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a | 2247 | &prog); |
b623c4da KC |
2248 | ASSERT_NE(ENOSYS, errno) { |
2249 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2250 | } | |
c99ee51a KC |
2251 | EXPECT_EQ(0, ret) { |
2252 | TH_LOG("Could not install initial filter with TSYNC!"); | |
2253 | } | |
2254 | } | |
2255 | ||
2256 | #define TSYNC_SIBLINGS 2 | |
2257 | struct tsync_sibling { | |
2258 | pthread_t tid; | |
2259 | pid_t system_tid; | |
2260 | sem_t *started; | |
2261 | pthread_cond_t *cond; | |
2262 | pthread_mutex_t *mutex; | |
2263 | int diverge; | |
2264 | int num_waits; | |
2265 | struct sock_fprog *prog; | |
2266 | struct __test_metadata *metadata; | |
2267 | }; | |
2268 | ||
93bd70e3 KC |
2269 | /* |
2270 | * To avoid joining joined threads (which is not allowed by Bionic), | |
2271 | * make sure we both successfully join and clear the tid to skip a | |
2272 | * later join attempt during fixture teardown. Any remaining threads | |
2273 | * will be directly killed during teardown. | |
2274 | */ | |
2275 | #define PTHREAD_JOIN(tid, status) \ | |
2276 | do { \ | |
2277 | int _rc = pthread_join(tid, status); \ | |
2278 | if (_rc) { \ | |
2279 | TH_LOG("pthread_join of tid %u failed: %d\n", \ | |
2280 | (unsigned int)tid, _rc); \ | |
2281 | } else { \ | |
2282 | tid = 0; \ | |
2283 | } \ | |
2284 | } while (0) | |
2285 | ||
c99ee51a KC |
2286 | FIXTURE_DATA(TSYNC) { |
2287 | struct sock_fprog root_prog, apply_prog; | |
2288 | struct tsync_sibling sibling[TSYNC_SIBLINGS]; | |
2289 | sem_t started; | |
2290 | pthread_cond_t cond; | |
2291 | pthread_mutex_t mutex; | |
2292 | int sibling_count; | |
2293 | }; | |
2294 | ||
2295 | FIXTURE_SETUP(TSYNC) | |
2296 | { | |
2297 | struct sock_filter root_filter[] = { | |
2298 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2299 | }; | |
2300 | struct sock_filter apply_filter[] = { | |
2301 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2302 | offsetof(struct seccomp_data, nr)), | |
2303 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
2304 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
2305 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2306 | }; | |
2307 | ||
2308 | memset(&self->root_prog, 0, sizeof(self->root_prog)); | |
2309 | memset(&self->apply_prog, 0, sizeof(self->apply_prog)); | |
2310 | memset(&self->sibling, 0, sizeof(self->sibling)); | |
2311 | self->root_prog.filter = malloc(sizeof(root_filter)); | |
2312 | ASSERT_NE(NULL, self->root_prog.filter); | |
2313 | memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter)); | |
2314 | self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter); | |
2315 | ||
2316 | self->apply_prog.filter = malloc(sizeof(apply_filter)); | |
2317 | ASSERT_NE(NULL, self->apply_prog.filter); | |
2318 | memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter)); | |
2319 | self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter); | |
2320 | ||
2321 | self->sibling_count = 0; | |
2322 | pthread_mutex_init(&self->mutex, NULL); | |
2323 | pthread_cond_init(&self->cond, NULL); | |
2324 | sem_init(&self->started, 0, 0); | |
2325 | self->sibling[0].tid = 0; | |
2326 | self->sibling[0].cond = &self->cond; | |
2327 | self->sibling[0].started = &self->started; | |
2328 | self->sibling[0].mutex = &self->mutex; | |
2329 | self->sibling[0].diverge = 0; | |
2330 | self->sibling[0].num_waits = 1; | |
2331 | self->sibling[0].prog = &self->root_prog; | |
2332 | self->sibling[0].metadata = _metadata; | |
2333 | self->sibling[1].tid = 0; | |
2334 | self->sibling[1].cond = &self->cond; | |
2335 | self->sibling[1].started = &self->started; | |
2336 | self->sibling[1].mutex = &self->mutex; | |
2337 | self->sibling[1].diverge = 0; | |
2338 | self->sibling[1].prog = &self->root_prog; | |
2339 | self->sibling[1].num_waits = 1; | |
2340 | self->sibling[1].metadata = _metadata; | |
2341 | } | |
2342 | ||
2343 | FIXTURE_TEARDOWN(TSYNC) | |
2344 | { | |
2345 | int sib = 0; | |
2346 | ||
2347 | if (self->root_prog.filter) | |
2348 | free(self->root_prog.filter); | |
2349 | if (self->apply_prog.filter) | |
2350 | free(self->apply_prog.filter); | |
2351 | ||
2352 | for ( ; sib < self->sibling_count; ++sib) { | |
2353 | struct tsync_sibling *s = &self->sibling[sib]; | |
c99ee51a KC |
2354 | |
2355 | if (!s->tid) | |
2356 | continue; | |
93bd70e3 KC |
2357 | /* |
2358 | * If a thread is still running, it may be stuck, so hit | |
2359 | * it over the head really hard. | |
2360 | */ | |
2361 | pthread_kill(s->tid, 9); | |
c99ee51a KC |
2362 | } |
2363 | pthread_mutex_destroy(&self->mutex); | |
2364 | pthread_cond_destroy(&self->cond); | |
2365 | sem_destroy(&self->started); | |
2366 | } | |
2367 | ||
2368 | void *tsync_sibling(void *data) | |
2369 | { | |
2370 | long ret = 0; | |
2371 | struct tsync_sibling *me = data; | |
2372 | ||
2373 | me->system_tid = syscall(__NR_gettid); | |
2374 | ||
2375 | pthread_mutex_lock(me->mutex); | |
2376 | if (me->diverge) { | |
2377 | /* Just re-apply the root prog to fork the tree */ | |
2378 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
2379 | me->prog, 0, 0); | |
2380 | } | |
2381 | sem_post(me->started); | |
2382 | /* Return outside of started so parent notices failures. */ | |
2383 | if (ret) { | |
2384 | pthread_mutex_unlock(me->mutex); | |
2385 | return (void *)SIBLING_EXIT_FAILURE; | |
2386 | } | |
2387 | do { | |
2388 | pthread_cond_wait(me->cond, me->mutex); | |
2389 | me->num_waits = me->num_waits - 1; | |
2390 | } while (me->num_waits); | |
2391 | pthread_mutex_unlock(me->mutex); | |
2392 | ||
2393 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0); | |
2394 | if (!ret) | |
2395 | return (void *)SIBLING_EXIT_NEWPRIVS; | |
2396 | read(0, NULL, 0); | |
2397 | return (void *)SIBLING_EXIT_UNKILLED; | |
2398 | } | |
2399 | ||
2400 | void tsync_start_sibling(struct tsync_sibling *sibling) | |
2401 | { | |
2402 | pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling); | |
2403 | } | |
2404 | ||
2405 | TEST_F(TSYNC, siblings_fail_prctl) | |
2406 | { | |
2407 | long ret; | |
2408 | void *status; | |
2409 | struct sock_filter filter[] = { | |
2410 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2411 | offsetof(struct seccomp_data, nr)), | |
2412 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
2413 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL), | |
2414 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2415 | }; | |
2416 | struct sock_fprog prog = { | |
2417 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2418 | .filter = filter, | |
2419 | }; | |
2420 | ||
2421 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2422 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2423 | } | |
2424 | ||
2425 | /* Check prctl failure detection by requesting sib 0 diverge. */ | |
2426 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
2427 | ASSERT_NE(ENOSYS, errno) { |
2428 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2429 | } | |
c99ee51a KC |
2430 | ASSERT_EQ(0, ret) { |
2431 | TH_LOG("setting filter failed"); | |
2432 | } | |
2433 | ||
2434 | self->sibling[0].diverge = 1; | |
2435 | tsync_start_sibling(&self->sibling[0]); | |
2436 | tsync_start_sibling(&self->sibling[1]); | |
2437 | ||
2438 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2439 | sem_wait(&self->started); | |
2440 | self->sibling_count++; | |
2441 | } | |
2442 | ||
2443 | /* Signal the threads to clean up*/ | |
2444 | pthread_mutex_lock(&self->mutex); | |
2445 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2446 | TH_LOG("cond broadcast non-zero"); | |
2447 | } | |
2448 | pthread_mutex_unlock(&self->mutex); | |
2449 | ||
2450 | /* Ensure diverging sibling failed to call prctl. */ | |
93bd70e3 | 2451 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2452 | EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status); |
93bd70e3 | 2453 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2454 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2455 | } | |
2456 | ||
2457 | TEST_F(TSYNC, two_siblings_with_ancestor) | |
2458 | { | |
2459 | long ret; | |
2460 | void *status; | |
2461 | ||
2462 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2463 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2464 | } | |
2465 | ||
2466 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2467 | ASSERT_NE(ENOSYS, errno) { |
2468 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2469 | } | |
c99ee51a KC |
2470 | ASSERT_EQ(0, ret) { |
2471 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2472 | } | |
2473 | tsync_start_sibling(&self->sibling[0]); | |
2474 | tsync_start_sibling(&self->sibling[1]); | |
2475 | ||
2476 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2477 | sem_wait(&self->started); | |
2478 | self->sibling_count++; | |
2479 | } | |
2480 | ||
6c045d07 | 2481 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2482 | &self->apply_prog); |
2483 | ASSERT_EQ(0, ret) { | |
2484 | TH_LOG("Could install filter on all threads!"); | |
2485 | } | |
2486 | /* Tell the siblings to test the policy */ | |
2487 | pthread_mutex_lock(&self->mutex); | |
2488 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2489 | TH_LOG("cond broadcast non-zero"); | |
2490 | } | |
2491 | pthread_mutex_unlock(&self->mutex); | |
2492 | /* Ensure they are both killed and don't exit cleanly. */ | |
93bd70e3 | 2493 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2494 | EXPECT_EQ(0x0, (long)status); |
93bd70e3 | 2495 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2496 | EXPECT_EQ(0x0, (long)status); |
2497 | } | |
2498 | ||
2499 | TEST_F(TSYNC, two_sibling_want_nnp) | |
2500 | { | |
2501 | void *status; | |
2502 | ||
2503 | /* start siblings before any prctl() operations */ | |
2504 | tsync_start_sibling(&self->sibling[0]); | |
2505 | tsync_start_sibling(&self->sibling[1]); | |
2506 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2507 | sem_wait(&self->started); | |
2508 | self->sibling_count++; | |
2509 | } | |
2510 | ||
2511 | /* Tell the siblings to test no policy */ | |
2512 | pthread_mutex_lock(&self->mutex); | |
2513 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2514 | TH_LOG("cond broadcast non-zero"); | |
2515 | } | |
2516 | pthread_mutex_unlock(&self->mutex); | |
2517 | ||
2518 | /* Ensure they are both upset about lacking nnp. */ | |
93bd70e3 | 2519 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2520 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); |
93bd70e3 | 2521 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2522 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); |
2523 | } | |
2524 | ||
2525 | TEST_F(TSYNC, two_siblings_with_no_filter) | |
2526 | { | |
2527 | long ret; | |
2528 | void *status; | |
2529 | ||
2530 | /* start siblings before any prctl() operations */ | |
2531 | tsync_start_sibling(&self->sibling[0]); | |
2532 | tsync_start_sibling(&self->sibling[1]); | |
2533 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2534 | sem_wait(&self->started); | |
2535 | self->sibling_count++; | |
2536 | } | |
2537 | ||
2538 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2539 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2540 | } | |
2541 | ||
6c045d07 | 2542 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a | 2543 | &self->apply_prog); |
b623c4da KC |
2544 | ASSERT_NE(ENOSYS, errno) { |
2545 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2546 | } | |
c99ee51a KC |
2547 | ASSERT_EQ(0, ret) { |
2548 | TH_LOG("Could install filter on all threads!"); | |
2549 | } | |
2550 | ||
2551 | /* Tell the siblings to test the policy */ | |
2552 | pthread_mutex_lock(&self->mutex); | |
2553 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2554 | TH_LOG("cond broadcast non-zero"); | |
2555 | } | |
2556 | pthread_mutex_unlock(&self->mutex); | |
2557 | ||
2558 | /* Ensure they are both killed and don't exit cleanly. */ | |
93bd70e3 | 2559 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2560 | EXPECT_EQ(0x0, (long)status); |
93bd70e3 | 2561 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2562 | EXPECT_EQ(0x0, (long)status); |
2563 | } | |
2564 | ||
2565 | TEST_F(TSYNC, two_siblings_with_one_divergence) | |
2566 | { | |
2567 | long ret; | |
2568 | void *status; | |
2569 | ||
2570 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2571 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2572 | } | |
2573 | ||
2574 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2575 | ASSERT_NE(ENOSYS, errno) { |
2576 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2577 | } | |
c99ee51a KC |
2578 | ASSERT_EQ(0, ret) { |
2579 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2580 | } | |
2581 | self->sibling[0].diverge = 1; | |
2582 | tsync_start_sibling(&self->sibling[0]); | |
2583 | tsync_start_sibling(&self->sibling[1]); | |
2584 | ||
2585 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2586 | sem_wait(&self->started); | |
2587 | self->sibling_count++; | |
2588 | } | |
2589 | ||
6c045d07 | 2590 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2591 | &self->apply_prog); |
2592 | ASSERT_EQ(self->sibling[0].system_tid, ret) { | |
2593 | TH_LOG("Did not fail on diverged sibling."); | |
2594 | } | |
2595 | ||
2596 | /* Wake the threads */ | |
2597 | pthread_mutex_lock(&self->mutex); | |
2598 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2599 | TH_LOG("cond broadcast non-zero"); | |
2600 | } | |
2601 | pthread_mutex_unlock(&self->mutex); | |
2602 | ||
2603 | /* Ensure they are both unkilled. */ | |
93bd70e3 | 2604 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2605 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
93bd70e3 | 2606 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2607 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2608 | } | |
2609 | ||
2610 | TEST_F(TSYNC, two_siblings_not_under_filter) | |
2611 | { | |
2612 | long ret, sib; | |
2613 | void *status; | |
2614 | ||
2615 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2616 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2617 | } | |
2618 | ||
2619 | /* | |
2620 | * Sibling 0 will have its own seccomp policy | |
2621 | * and Sibling 1 will not be under seccomp at | |
2622 | * all. Sibling 1 will enter seccomp and 0 | |
2623 | * will cause failure. | |
2624 | */ | |
2625 | self->sibling[0].diverge = 1; | |
2626 | tsync_start_sibling(&self->sibling[0]); | |
2627 | tsync_start_sibling(&self->sibling[1]); | |
2628 | ||
2629 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2630 | sem_wait(&self->started); | |
2631 | self->sibling_count++; | |
2632 | } | |
2633 | ||
2634 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2635 | ASSERT_NE(ENOSYS, errno) { |
2636 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2637 | } | |
c99ee51a KC |
2638 | ASSERT_EQ(0, ret) { |
2639 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2640 | } | |
2641 | ||
6c045d07 | 2642 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2643 | &self->apply_prog); |
2644 | ASSERT_EQ(ret, self->sibling[0].system_tid) { | |
2645 | TH_LOG("Did not fail on diverged sibling."); | |
2646 | } | |
2647 | sib = 1; | |
2648 | if (ret == self->sibling[0].system_tid) | |
2649 | sib = 0; | |
2650 | ||
2651 | pthread_mutex_lock(&self->mutex); | |
2652 | ||
2653 | /* Increment the other siblings num_waits so we can clean up | |
2654 | * the one we just saw. | |
2655 | */ | |
2656 | self->sibling[!sib].num_waits += 1; | |
2657 | ||
2658 | /* Signal the thread to clean up*/ | |
2659 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2660 | TH_LOG("cond broadcast non-zero"); | |
2661 | } | |
2662 | pthread_mutex_unlock(&self->mutex); | |
93bd70e3 | 2663 | PTHREAD_JOIN(self->sibling[sib].tid, &status); |
c99ee51a KC |
2664 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2665 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2666 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2667 | sleep(0.1); | |
2668 | /* Switch to the remaining sibling */ | |
2669 | sib = !sib; | |
2670 | ||
6c045d07 | 2671 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2672 | &self->apply_prog); |
2673 | ASSERT_EQ(0, ret) { | |
2674 | TH_LOG("Expected the remaining sibling to sync"); | |
2675 | }; | |
2676 | ||
2677 | pthread_mutex_lock(&self->mutex); | |
2678 | ||
2679 | /* If remaining sibling didn't have a chance to wake up during | |
2680 | * the first broadcast, manually reduce the num_waits now. | |
2681 | */ | |
2682 | if (self->sibling[sib].num_waits > 1) | |
2683 | self->sibling[sib].num_waits = 1; | |
2684 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2685 | TH_LOG("cond broadcast non-zero"); | |
2686 | } | |
2687 | pthread_mutex_unlock(&self->mutex); | |
93bd70e3 | 2688 | PTHREAD_JOIN(self->sibling[sib].tid, &status); |
c99ee51a KC |
2689 | EXPECT_EQ(0, (long)status); |
2690 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2691 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2692 | sleep(0.1); | |
2693 | ||
6c045d07 | 2694 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2695 | &self->apply_prog); |
2696 | ASSERT_EQ(0, ret); /* just us chickens */ | |
2697 | } | |
2698 | ||
2699 | /* Make sure restarted syscalls are seen directly as "restart_syscall". */ | |
2700 | TEST(syscall_restart) | |
2701 | { | |
2702 | long ret; | |
2703 | unsigned long msg; | |
2704 | pid_t child_pid; | |
2705 | int pipefd[2]; | |
2706 | int status; | |
2707 | siginfo_t info = { }; | |
2708 | struct sock_filter filter[] = { | |
2709 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2710 | offsetof(struct seccomp_data, nr)), | |
2711 | ||
2712 | #ifdef __NR_sigreturn | |
2713 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0), | |
2714 | #endif | |
2715 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0), | |
2716 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0), | |
2717 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0), | |
256d0afb | 2718 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0), |
c99ee51a KC |
2719 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0), |
2720 | ||
2721 | /* Allow __NR_write for easy logging. */ | |
2722 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1), | |
2723 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2724 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
256d0afb KC |
2725 | /* The nanosleep jump target. */ |
2726 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100), | |
2727 | /* The restart_syscall jump target. */ | |
2728 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200), | |
c99ee51a KC |
2729 | }; |
2730 | struct sock_fprog prog = { | |
2731 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2732 | .filter = filter, | |
2733 | }; | |
256d0afb KC |
2734 | #if defined(__arm__) |
2735 | struct utsname utsbuf; | |
2736 | #endif | |
c99ee51a KC |
2737 | |
2738 | ASSERT_EQ(0, pipe(pipefd)); | |
2739 | ||
2740 | child_pid = fork(); | |
2741 | ASSERT_LE(0, child_pid); | |
2742 | if (child_pid == 0) { | |
2743 | /* Child uses EXPECT not ASSERT to deliver status correctly. */ | |
2744 | char buf = ' '; | |
256d0afb | 2745 | struct timespec timeout = { }; |
c99ee51a KC |
2746 | |
2747 | /* Attach parent as tracer and stop. */ | |
2748 | EXPECT_EQ(0, ptrace(PTRACE_TRACEME)); | |
2749 | EXPECT_EQ(0, raise(SIGSTOP)); | |
2750 | ||
2751 | EXPECT_EQ(0, close(pipefd[1])); | |
2752 | ||
2753 | EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2754 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2755 | } | |
2756 | ||
2757 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
2758 | EXPECT_EQ(0, ret) { | |
2759 | TH_LOG("Failed to install filter!"); | |
2760 | } | |
2761 | ||
2762 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2763 | TH_LOG("Failed to read() sync from parent"); | |
2764 | } | |
2765 | EXPECT_EQ('.', buf) { | |
2766 | TH_LOG("Failed to get sync data from read()"); | |
2767 | } | |
2768 | ||
256d0afb KC |
2769 | /* Start nanosleep to be interrupted. */ |
2770 | timeout.tv_sec = 1; | |
c99ee51a | 2771 | errno = 0; |
256d0afb KC |
2772 | EXPECT_EQ(0, nanosleep(&timeout, NULL)) { |
2773 | TH_LOG("Call to nanosleep() failed (errno %d)", errno); | |
c99ee51a KC |
2774 | } |
2775 | ||
2776 | /* Read final sync from parent. */ | |
2777 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2778 | TH_LOG("Failed final read() from parent"); | |
2779 | } | |
2780 | EXPECT_EQ('!', buf) { | |
2781 | TH_LOG("Failed to get final data from read()"); | |
2782 | } | |
2783 | ||
2784 | /* Directly report the status of our test harness results. */ | |
2785 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS | |
2786 | : EXIT_FAILURE); | |
2787 | } | |
2788 | EXPECT_EQ(0, close(pipefd[0])); | |
2789 | ||
2790 | /* Attach to child, setup options, and release. */ | |
2791 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2792 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2793 | ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL, | |
2794 | PTRACE_O_TRACESECCOMP)); | |
2795 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2796 | ASSERT_EQ(1, write(pipefd[1], ".", 1)); | |
2797 | ||
256d0afb | 2798 | /* Wait for nanosleep() to start. */ |
c99ee51a KC |
2799 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); |
2800 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2801 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2802 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2803 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
2804 | ASSERT_EQ(0x100, msg); | |
256d0afb | 2805 | EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid)); |
c99ee51a KC |
2806 | |
2807 | /* Might as well check siginfo for sanity while we're here. */ | |
2808 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2809 | ASSERT_EQ(SIGTRAP, info.si_signo); | |
2810 | ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code); | |
2811 | EXPECT_EQ(0, info.si_errno); | |
2812 | EXPECT_EQ(getuid(), info.si_uid); | |
2813 | /* Verify signal delivery came from child (seccomp-triggered). */ | |
2814 | EXPECT_EQ(child_pid, info.si_pid); | |
2815 | ||
256d0afb | 2816 | /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */ |
c99ee51a KC |
2817 | ASSERT_EQ(0, kill(child_pid, SIGSTOP)); |
2818 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2819 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2820 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2821 | ASSERT_EQ(SIGSTOP, WSTOPSIG(status)); | |
c99ee51a | 2822 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); |
2bd61abe KC |
2823 | /* |
2824 | * There is no siginfo on SIGSTOP any more, so we can't verify | |
2825 | * signal delivery came from parent now (getpid() == info.si_pid). | |
2826 | * https://lkml.kernel.org/r/CAGXu5jJaZAOzP1qFz66tYrtbuywqb+UN2SOA1VLHpCCOiYvYeg@mail.gmail.com | |
2827 | * At least verify the SIGSTOP via PTRACE_GETSIGINFO. | |
2828 | */ | |
2829 | EXPECT_EQ(SIGSTOP, info.si_signo); | |
c99ee51a | 2830 | |
256d0afb | 2831 | /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */ |
c99ee51a KC |
2832 | ASSERT_EQ(0, kill(child_pid, SIGCONT)); |
2833 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2834 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2835 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2836 | ASSERT_EQ(SIGCONT, WSTOPSIG(status)); | |
2837 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2838 | ||
2839 | /* Wait for restart_syscall() to start. */ | |
2840 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2841 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2842 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2843 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2844 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
256d0afb | 2845 | |
c99ee51a KC |
2846 | ASSERT_EQ(0x200, msg); |
2847 | ret = get_syscall(_metadata, child_pid); | |
2848 | #if defined(__arm__) | |
256d0afb KC |
2849 | /* |
2850 | * FIXME: | |
2851 | * - native ARM registers do NOT expose true syscall. | |
2852 | * - compat ARM registers on ARM64 DO expose true syscall. | |
2853 | */ | |
2854 | ASSERT_EQ(0, uname(&utsbuf)); | |
2855 | if (strncmp(utsbuf.machine, "arm", 3) == 0) { | |
2856 | EXPECT_EQ(__NR_nanosleep, ret); | |
2857 | } else | |
c99ee51a | 2858 | #endif |
256d0afb KC |
2859 | { |
2860 | EXPECT_EQ(__NR_restart_syscall, ret); | |
2861 | } | |
c99ee51a | 2862 | |
256d0afb | 2863 | /* Write again to end test. */ |
c99ee51a KC |
2864 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); |
2865 | ASSERT_EQ(1, write(pipefd[1], "!", 1)); | |
2866 | EXPECT_EQ(0, close(pipefd[1])); | |
2867 | ||
2868 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2869 | if (WIFSIGNALED(status) || WEXITSTATUS(status)) | |
2870 | _metadata->passed = 0; | |
2871 | } | |
2872 | ||
e66a3997 TH |
2873 | TEST_SIGNAL(filter_flag_log, SIGSYS) |
2874 | { | |
2875 | struct sock_filter allow_filter[] = { | |
2876 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2877 | }; | |
2878 | struct sock_filter kill_filter[] = { | |
2879 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2880 | offsetof(struct seccomp_data, nr)), | |
2881 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
2882 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
2883 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2884 | }; | |
2885 | struct sock_fprog allow_prog = { | |
2886 | .len = (unsigned short)ARRAY_SIZE(allow_filter), | |
2887 | .filter = allow_filter, | |
2888 | }; | |
2889 | struct sock_fprog kill_prog = { | |
2890 | .len = (unsigned short)ARRAY_SIZE(kill_filter), | |
2891 | .filter = kill_filter, | |
2892 | }; | |
2893 | long ret; | |
2894 | pid_t parent = getppid(); | |
2895 | ||
2896 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
2897 | ASSERT_EQ(0, ret); | |
2898 | ||
2899 | /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */ | |
2900 | ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG, | |
2901 | &allow_prog); | |
2902 | ASSERT_NE(ENOSYS, errno) { | |
2903 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2904 | } | |
2905 | EXPECT_NE(0, ret) { | |
2906 | TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!"); | |
2907 | } | |
2908 | EXPECT_EQ(EINVAL, errno) { | |
2909 | TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!"); | |
2910 | } | |
2911 | ||
2912 | /* Verify that a simple, permissive filter can be added with no flags */ | |
2913 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog); | |
2914 | EXPECT_EQ(0, ret); | |
2915 | ||
2916 | /* See if the same filter can be added with the FILTER_FLAG_LOG flag */ | |
2917 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, | |
2918 | &allow_prog); | |
2919 | ASSERT_NE(EINVAL, errno) { | |
2920 | TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!"); | |
2921 | } | |
2922 | EXPECT_EQ(0, ret); | |
2923 | ||
2924 | /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */ | |
2925 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, | |
2926 | &kill_prog); | |
2927 | EXPECT_EQ(0, ret); | |
2928 | ||
2929 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
2930 | /* getpid() should never return. */ | |
2931 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
2932 | } | |
2933 | ||
d612b1fd TH |
2934 | TEST(get_action_avail) |
2935 | { | |
fd76875c | 2936 | __u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP, |
d612b1fd | 2937 | SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE, |
59f5cf44 | 2938 | SECCOMP_RET_LOG, SECCOMP_RET_ALLOW }; |
d612b1fd TH |
2939 | __u32 unknown_action = 0x10000000U; |
2940 | int i; | |
2941 | long ret; | |
2942 | ||
2943 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]); | |
2944 | ASSERT_NE(ENOSYS, errno) { | |
2945 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2946 | } | |
2947 | ASSERT_NE(EINVAL, errno) { | |
2948 | TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!"); | |
2949 | } | |
2950 | EXPECT_EQ(ret, 0); | |
2951 | ||
2952 | for (i = 0; i < ARRAY_SIZE(actions); i++) { | |
2953 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]); | |
2954 | EXPECT_EQ(ret, 0) { | |
2955 | TH_LOG("Expected action (0x%X) not available!", | |
2956 | actions[i]); | |
2957 | } | |
2958 | } | |
2959 | ||
2960 | /* Check that an unknown action is handled properly (EOPNOTSUPP) */ | |
2961 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action); | |
2962 | EXPECT_EQ(ret, -1); | |
2963 | EXPECT_EQ(errno, EOPNOTSUPP); | |
2964 | } | |
2965 | ||
d057dc4e TA |
2966 | TEST(get_metadata) |
2967 | { | |
2968 | pid_t pid; | |
2969 | int pipefd[2]; | |
2970 | char buf; | |
2971 | struct seccomp_metadata md; | |
6c3b6d50 | 2972 | long ret; |
d057dc4e TA |
2973 | |
2974 | ASSERT_EQ(0, pipe(pipefd)); | |
2975 | ||
2976 | pid = fork(); | |
2977 | ASSERT_GE(pid, 0); | |
2978 | if (pid == 0) { | |
2979 | struct sock_filter filter[] = { | |
2980 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2981 | }; | |
2982 | struct sock_fprog prog = { | |
2983 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2984 | .filter = filter, | |
2985 | }; | |
2986 | ||
2987 | /* one with log, one without */ | |
2988 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, | |
2989 | SECCOMP_FILTER_FLAG_LOG, &prog)); | |
2990 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog)); | |
2991 | ||
2992 | ASSERT_EQ(0, close(pipefd[0])); | |
2993 | ASSERT_EQ(1, write(pipefd[1], "1", 1)); | |
2994 | ASSERT_EQ(0, close(pipefd[1])); | |
2995 | ||
2996 | while (1) | |
2997 | sleep(100); | |
2998 | } | |
2999 | ||
3000 | ASSERT_EQ(0, close(pipefd[1])); | |
3001 | ASSERT_EQ(1, read(pipefd[0], &buf, 1)); | |
3002 | ||
3003 | ASSERT_EQ(0, ptrace(PTRACE_ATTACH, pid)); | |
3004 | ASSERT_EQ(pid, waitpid(pid, NULL, 0)); | |
3005 | ||
6c3b6d50 KC |
3006 | /* Past here must not use ASSERT or child process is never killed. */ |
3007 | ||
d057dc4e | 3008 | md.filter_off = 0; |
6c3b6d50 KC |
3009 | errno = 0; |
3010 | ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md); | |
3011 | EXPECT_EQ(sizeof(md), ret) { | |
3012 | if (errno == EINVAL) | |
3013 | XFAIL(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)"); | |
3014 | } | |
3015 | ||
d057dc4e TA |
3016 | EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG); |
3017 | EXPECT_EQ(md.filter_off, 0); | |
3018 | ||
3019 | md.filter_off = 1; | |
6c3b6d50 KC |
3020 | ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md); |
3021 | EXPECT_EQ(sizeof(md), ret); | |
d057dc4e TA |
3022 | EXPECT_EQ(md.flags, 0); |
3023 | EXPECT_EQ(md.filter_off, 1); | |
3024 | ||
6c3b6d50 | 3025 | skip: |
d057dc4e TA |
3026 | ASSERT_EQ(0, kill(pid, SIGKILL)); |
3027 | } | |
3028 | ||
6a21cc50 TA |
3029 | static int user_trap_syscall(int nr, unsigned int flags) |
3030 | { | |
3031 | struct sock_filter filter[] = { | |
3032 | BPF_STMT(BPF_LD+BPF_W+BPF_ABS, | |
3033 | offsetof(struct seccomp_data, nr)), | |
3034 | BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, nr, 0, 1), | |
3035 | BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_USER_NOTIF), | |
3036 | BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW), | |
3037 | }; | |
3038 | ||
3039 | struct sock_fprog prog = { | |
3040 | .len = (unsigned short)ARRAY_SIZE(filter), | |
3041 | .filter = filter, | |
3042 | }; | |
3043 | ||
3044 | return seccomp(SECCOMP_SET_MODE_FILTER, flags, &prog); | |
3045 | } | |
3046 | ||
3047 | #define USER_NOTIF_MAGIC 116983961184613L | |
3048 | TEST(user_notification_basic) | |
3049 | { | |
3050 | pid_t pid; | |
3051 | long ret; | |
3052 | int status, listener; | |
3053 | struct seccomp_notif req = {}; | |
3054 | struct seccomp_notif_resp resp = {}; | |
3055 | struct pollfd pollfd; | |
3056 | ||
3057 | struct sock_filter filter[] = { | |
3058 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
3059 | }; | |
3060 | struct sock_fprog prog = { | |
3061 | .len = (unsigned short)ARRAY_SIZE(filter), | |
3062 | .filter = filter, | |
3063 | }; | |
3064 | ||
3065 | pid = fork(); | |
3066 | ASSERT_GE(pid, 0); | |
3067 | ||
3068 | /* Check that we get -ENOSYS with no listener attached */ | |
3069 | if (pid == 0) { | |
3070 | if (user_trap_syscall(__NR_getpid, 0) < 0) | |
3071 | exit(1); | |
3072 | ret = syscall(__NR_getpid); | |
3073 | exit(ret >= 0 || errno != ENOSYS); | |
3074 | } | |
3075 | ||
3076 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3077 | EXPECT_EQ(true, WIFEXITED(status)); | |
3078 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3079 | ||
3080 | /* Add some no-op filters so for grins. */ | |
3081 | EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0); | |
3082 | EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0); | |
3083 | EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0); | |
3084 | EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0); | |
3085 | ||
3086 | /* Check that the basic notification machinery works */ | |
3087 | listener = user_trap_syscall(__NR_getpid, | |
3088 | SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3d244c19 | 3089 | ASSERT_GE(listener, 0); |
6a21cc50 TA |
3090 | |
3091 | /* Installing a second listener in the chain should EBUSY */ | |
3092 | EXPECT_EQ(user_trap_syscall(__NR_getpid, | |
3093 | SECCOMP_FILTER_FLAG_NEW_LISTENER), | |
3094 | -1); | |
3095 | EXPECT_EQ(errno, EBUSY); | |
3096 | ||
3097 | pid = fork(); | |
3098 | ASSERT_GE(pid, 0); | |
3099 | ||
3100 | if (pid == 0) { | |
3101 | ret = syscall(__NR_getpid); | |
3102 | exit(ret != USER_NOTIF_MAGIC); | |
3103 | } | |
3104 | ||
3105 | pollfd.fd = listener; | |
3106 | pollfd.events = POLLIN | POLLOUT; | |
3107 | ||
3108 | EXPECT_GT(poll(&pollfd, 1, -1), 0); | |
3109 | EXPECT_EQ(pollfd.revents, POLLIN); | |
3110 | ||
3111 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3112 | ||
3113 | pollfd.fd = listener; | |
3114 | pollfd.events = POLLIN | POLLOUT; | |
3115 | ||
3116 | EXPECT_GT(poll(&pollfd, 1, -1), 0); | |
3117 | EXPECT_EQ(pollfd.revents, POLLOUT); | |
3118 | ||
3119 | EXPECT_EQ(req.data.nr, __NR_getpid); | |
3120 | ||
3121 | resp.id = req.id; | |
3122 | resp.error = 0; | |
3123 | resp.val = USER_NOTIF_MAGIC; | |
3124 | ||
3125 | /* check that we make sure flags == 0 */ | |
3126 | resp.flags = 1; | |
3127 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1); | |
3128 | EXPECT_EQ(errno, EINVAL); | |
3129 | ||
3130 | resp.flags = 0; | |
3131 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); | |
3132 | ||
3133 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3134 | EXPECT_EQ(true, WIFEXITED(status)); | |
3135 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3136 | } | |
3137 | ||
3138 | TEST(user_notification_kill_in_middle) | |
3139 | { | |
3140 | pid_t pid; | |
3141 | long ret; | |
3142 | int listener; | |
3143 | struct seccomp_notif req = {}; | |
3144 | struct seccomp_notif_resp resp = {}; | |
3145 | ||
3146 | listener = user_trap_syscall(__NR_getpid, | |
3147 | SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3d244c19 | 3148 | ASSERT_GE(listener, 0); |
6a21cc50 TA |
3149 | |
3150 | /* | |
3151 | * Check that nothing bad happens when we kill the task in the middle | |
3152 | * of a syscall. | |
3153 | */ | |
3154 | pid = fork(); | |
3155 | ASSERT_GE(pid, 0); | |
3156 | ||
3157 | if (pid == 0) { | |
3158 | ret = syscall(__NR_getpid); | |
3159 | exit(ret != USER_NOTIF_MAGIC); | |
3160 | } | |
3161 | ||
3162 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3163 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), 0); | |
3164 | ||
3165 | EXPECT_EQ(kill(pid, SIGKILL), 0); | |
3166 | EXPECT_EQ(waitpid(pid, NULL, 0), pid); | |
3167 | ||
3168 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), -1); | |
3169 | ||
3170 | resp.id = req.id; | |
3171 | ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp); | |
3172 | EXPECT_EQ(ret, -1); | |
3173 | EXPECT_EQ(errno, ENOENT); | |
3174 | } | |
3175 | ||
3176 | static int handled = -1; | |
3177 | ||
3178 | static void signal_handler(int signal) | |
3179 | { | |
3180 | if (write(handled, "c", 1) != 1) | |
3181 | perror("write from signal"); | |
3182 | } | |
3183 | ||
3184 | TEST(user_notification_signal) | |
3185 | { | |
3186 | pid_t pid; | |
3187 | long ret; | |
3188 | int status, listener, sk_pair[2]; | |
3189 | struct seccomp_notif req = {}; | |
3190 | struct seccomp_notif_resp resp = {}; | |
3191 | char c; | |
3192 | ||
3193 | ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0); | |
3194 | ||
3195 | listener = user_trap_syscall(__NR_gettid, | |
3196 | SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3d244c19 | 3197 | ASSERT_GE(listener, 0); |
6a21cc50 TA |
3198 | |
3199 | pid = fork(); | |
3200 | ASSERT_GE(pid, 0); | |
3201 | ||
3202 | if (pid == 0) { | |
3203 | close(sk_pair[0]); | |
3204 | handled = sk_pair[1]; | |
3205 | if (signal(SIGUSR1, signal_handler) == SIG_ERR) { | |
3206 | perror("signal"); | |
3207 | exit(1); | |
3208 | } | |
3209 | /* | |
3210 | * ERESTARTSYS behavior is a bit hard to test, because we need | |
3211 | * to rely on a signal that has not yet been handled. Let's at | |
3212 | * least check that the error code gets propagated through, and | |
3213 | * hope that it doesn't break when there is actually a signal :) | |
3214 | */ | |
3215 | ret = syscall(__NR_gettid); | |
3216 | exit(!(ret == -1 && errno == 512)); | |
3217 | } | |
3218 | ||
3219 | close(sk_pair[1]); | |
3220 | ||
3221 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3222 | ||
3223 | EXPECT_EQ(kill(pid, SIGUSR1), 0); | |
3224 | ||
3225 | /* | |
3226 | * Make sure the signal really is delivered, which means we're not | |
3227 | * stuck in the user notification code any more and the notification | |
3228 | * should be dead. | |
3229 | */ | |
3230 | EXPECT_EQ(read(sk_pair[0], &c, 1), 1); | |
3231 | ||
3232 | resp.id = req.id; | |
3233 | resp.error = -EPERM; | |
3234 | resp.val = 0; | |
3235 | ||
3236 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1); | |
3237 | EXPECT_EQ(errno, ENOENT); | |
3238 | ||
3239 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3240 | ||
3241 | resp.id = req.id; | |
3242 | resp.error = -512; /* -ERESTARTSYS */ | |
3243 | resp.val = 0; | |
3244 | ||
3245 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); | |
3246 | ||
3247 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3248 | EXPECT_EQ(true, WIFEXITED(status)); | |
3249 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3250 | } | |
3251 | ||
3252 | TEST(user_notification_closed_listener) | |
3253 | { | |
3254 | pid_t pid; | |
3255 | long ret; | |
3256 | int status, listener; | |
3257 | ||
3258 | listener = user_trap_syscall(__NR_getpid, | |
3259 | SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3d244c19 | 3260 | ASSERT_GE(listener, 0); |
6a21cc50 TA |
3261 | |
3262 | /* | |
3263 | * Check that we get an ENOSYS when the listener is closed. | |
3264 | */ | |
3265 | pid = fork(); | |
3266 | ASSERT_GE(pid, 0); | |
3267 | if (pid == 0) { | |
3268 | close(listener); | |
3269 | ret = syscall(__NR_getpid); | |
3270 | exit(ret != -1 && errno != ENOSYS); | |
3271 | } | |
3272 | ||
3273 | close(listener); | |
3274 | ||
3275 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3276 | EXPECT_EQ(true, WIFEXITED(status)); | |
3277 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3278 | } | |
3279 | ||
3280 | /* | |
3281 | * Check that a pid in a child namespace still shows up as valid in ours. | |
3282 | */ | |
3283 | TEST(user_notification_child_pid_ns) | |
3284 | { | |
3285 | pid_t pid; | |
3286 | int status, listener; | |
3287 | struct seccomp_notif req = {}; | |
3288 | struct seccomp_notif_resp resp = {}; | |
3289 | ||
3290 | ASSERT_EQ(unshare(CLONE_NEWPID), 0); | |
3291 | ||
3292 | listener = user_trap_syscall(__NR_getpid, SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3293 | ASSERT_GE(listener, 0); | |
3294 | ||
3295 | pid = fork(); | |
3296 | ASSERT_GE(pid, 0); | |
3297 | ||
3298 | if (pid == 0) | |
3299 | exit(syscall(__NR_getpid) != USER_NOTIF_MAGIC); | |
3300 | ||
3301 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3302 | EXPECT_EQ(req.pid, pid); | |
3303 | ||
3304 | resp.id = req.id; | |
3305 | resp.error = 0; | |
3306 | resp.val = USER_NOTIF_MAGIC; | |
3307 | ||
3308 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); | |
3309 | ||
3310 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3311 | EXPECT_EQ(true, WIFEXITED(status)); | |
3312 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3313 | close(listener); | |
3314 | } | |
3315 | ||
3316 | /* | |
3317 | * Check that a pid in a sibling (i.e. unrelated) namespace shows up as 0, i.e. | |
3318 | * invalid. | |
3319 | */ | |
3320 | TEST(user_notification_sibling_pid_ns) | |
3321 | { | |
3322 | pid_t pid, pid2; | |
3323 | int status, listener; | |
3324 | struct seccomp_notif req = {}; | |
3325 | struct seccomp_notif_resp resp = {}; | |
3326 | ||
3327 | listener = user_trap_syscall(__NR_getpid, SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3328 | ASSERT_GE(listener, 0); | |
3329 | ||
3330 | pid = fork(); | |
3331 | ASSERT_GE(pid, 0); | |
3332 | ||
3333 | if (pid == 0) { | |
3334 | ASSERT_EQ(unshare(CLONE_NEWPID), 0); | |
3335 | ||
3336 | pid2 = fork(); | |
3337 | ASSERT_GE(pid2, 0); | |
3338 | ||
3339 | if (pid2 == 0) | |
3340 | exit(syscall(__NR_getpid) != USER_NOTIF_MAGIC); | |
3341 | ||
3342 | EXPECT_EQ(waitpid(pid2, &status, 0), pid2); | |
3343 | EXPECT_EQ(true, WIFEXITED(status)); | |
3344 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3345 | exit(WEXITSTATUS(status)); | |
3346 | } | |
3347 | ||
3348 | /* Create the sibling ns, and sibling in it. */ | |
3349 | EXPECT_EQ(unshare(CLONE_NEWPID), 0); | |
3350 | EXPECT_EQ(errno, 0); | |
3351 | ||
3352 | pid2 = fork(); | |
3353 | EXPECT_GE(pid2, 0); | |
3354 | ||
3355 | if (pid2 == 0) { | |
3356 | ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3357 | /* | |
3358 | * The pid should be 0, i.e. the task is in some namespace that | |
3359 | * we can't "see". | |
3360 | */ | |
3361 | ASSERT_EQ(req.pid, 0); | |
3362 | ||
3363 | resp.id = req.id; | |
3364 | resp.error = 0; | |
3365 | resp.val = USER_NOTIF_MAGIC; | |
3366 | ||
3367 | ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); | |
3368 | exit(0); | |
3369 | } | |
3370 | ||
3371 | close(listener); | |
3372 | ||
3373 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3374 | EXPECT_EQ(true, WIFEXITED(status)); | |
3375 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3376 | ||
3377 | EXPECT_EQ(waitpid(pid2, &status, 0), pid2); | |
3378 | EXPECT_EQ(true, WIFEXITED(status)); | |
3379 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3380 | } | |
3381 | ||
3382 | TEST(user_notification_fault_recv) | |
3383 | { | |
3384 | pid_t pid; | |
3385 | int status, listener; | |
3386 | struct seccomp_notif req = {}; | |
3387 | struct seccomp_notif_resp resp = {}; | |
3388 | ||
3389 | listener = user_trap_syscall(__NR_getpid, SECCOMP_FILTER_FLAG_NEW_LISTENER); | |
3390 | ASSERT_GE(listener, 0); | |
3391 | ||
3392 | pid = fork(); | |
3393 | ASSERT_GE(pid, 0); | |
3394 | ||
3395 | if (pid == 0) | |
3396 | exit(syscall(__NR_getpid) != USER_NOTIF_MAGIC); | |
3397 | ||
3398 | /* Do a bad recv() */ | |
3399 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, NULL), -1); | |
3400 | EXPECT_EQ(errno, EFAULT); | |
3401 | ||
3402 | /* We should still be able to receive this notification, though. */ | |
3403 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0); | |
3404 | EXPECT_EQ(req.pid, pid); | |
3405 | ||
3406 | resp.id = req.id; | |
3407 | resp.error = 0; | |
3408 | resp.val = USER_NOTIF_MAGIC; | |
3409 | ||
3410 | EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0); | |
3411 | ||
3412 | EXPECT_EQ(waitpid(pid, &status, 0), pid); | |
3413 | EXPECT_EQ(true, WIFEXITED(status)); | |
3414 | EXPECT_EQ(0, WEXITSTATUS(status)); | |
3415 | } | |
3416 | ||
3417 | TEST(seccomp_get_notif_sizes) | |
3418 | { | |
3419 | struct seccomp_notif_sizes sizes; | |
3420 | ||
3d244c19 | 3421 | ASSERT_EQ(seccomp(SECCOMP_GET_NOTIF_SIZES, 0, &sizes), 0); |
6a21cc50 TA |
3422 | EXPECT_EQ(sizes.seccomp_notif, sizeof(struct seccomp_notif)); |
3423 | EXPECT_EQ(sizes.seccomp_notif_resp, sizeof(struct seccomp_notif_resp)); | |
3424 | } | |
3425 | ||
c99ee51a KC |
3426 | /* |
3427 | * TODO: | |
3428 | * - add microbenchmarks | |
3429 | * - expand NNP testing | |
3430 | * - better arch-specific TRACE and TRAP handlers. | |
3431 | * - endianness checking when appropriate | |
3432 | * - 64-bit arg prodding | |
3433 | * - arch value testing (x86 modes especially) | |
e66a3997 | 3434 | * - verify that FILTER_FLAG_LOG filters generate log messages |
59f5cf44 | 3435 | * - verify that RET_LOG generates log messages |
c99ee51a KC |
3436 | * - ... |
3437 | */ | |
3438 | ||
3439 | TEST_HARNESS_MAIN |