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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 | ||
8 | #include <asm/siginfo.h> | |
9 | #define __have_siginfo_t 1 | |
10 | #define __have_sigval_t 1 | |
11 | #define __have_sigevent_t 1 | |
12 | ||
13 | #include <errno.h> | |
14 | #include <linux/filter.h> | |
15 | #include <sys/prctl.h> | |
16 | #include <sys/ptrace.h> | |
5d83c2b3 | 17 | #include <sys/types.h> |
c99ee51a KC |
18 | #include <sys/user.h> |
19 | #include <linux/prctl.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/seccomp.h> | |
c99ee51a KC |
22 | #include <pthread.h> |
23 | #include <semaphore.h> | |
24 | #include <signal.h> | |
25 | #include <stddef.h> | |
26 | #include <stdbool.h> | |
27 | #include <string.h> | |
256d0afb | 28 | #include <time.h> |
c99ee51a KC |
29 | #include <linux/elf.h> |
30 | #include <sys/uio.h> | |
256d0afb | 31 | #include <sys/utsname.h> |
fd88d16c RS |
32 | #include <sys/fcntl.h> |
33 | #include <sys/mman.h> | |
34 | #include <sys/times.h> | |
c99ee51a KC |
35 | |
36 | #define _GNU_SOURCE | |
37 | #include <unistd.h> | |
38 | #include <sys/syscall.h> | |
39 | ||
40 | #include "test_harness.h" | |
41 | ||
42 | #ifndef PR_SET_PTRACER | |
43 | # define PR_SET_PTRACER 0x59616d61 | |
44 | #endif | |
45 | ||
46 | #ifndef PR_SET_NO_NEW_PRIVS | |
47 | #define PR_SET_NO_NEW_PRIVS 38 | |
48 | #define PR_GET_NO_NEW_PRIVS 39 | |
49 | #endif | |
50 | ||
51 | #ifndef PR_SECCOMP_EXT | |
52 | #define PR_SECCOMP_EXT 43 | |
53 | #endif | |
54 | ||
55 | #ifndef SECCOMP_EXT_ACT | |
56 | #define SECCOMP_EXT_ACT 1 | |
57 | #endif | |
58 | ||
59 | #ifndef SECCOMP_EXT_ACT_TSYNC | |
60 | #define SECCOMP_EXT_ACT_TSYNC 1 | |
61 | #endif | |
62 | ||
63 | #ifndef SECCOMP_MODE_STRICT | |
64 | #define SECCOMP_MODE_STRICT 1 | |
65 | #endif | |
66 | ||
67 | #ifndef SECCOMP_MODE_FILTER | |
68 | #define SECCOMP_MODE_FILTER 2 | |
69 | #endif | |
70 | ||
71 | #ifndef SECCOMP_RET_KILL | |
72 | #define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */ | |
73 | #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */ | |
74 | #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */ | |
75 | #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */ | |
76 | #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */ | |
77 | ||
78 | /* Masks for the return value sections. */ | |
79 | #define SECCOMP_RET_ACTION 0x7fff0000U | |
80 | #define SECCOMP_RET_DATA 0x0000ffffU | |
81 | ||
82 | struct seccomp_data { | |
83 | int nr; | |
84 | __u32 arch; | |
85 | __u64 instruction_pointer; | |
86 | __u64 args[6]; | |
87 | }; | |
88 | #endif | |
89 | ||
c385d0db | 90 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
c99ee51a | 91 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n])) |
c385d0db ME |
92 | #elif __BYTE_ORDER == __BIG_ENDIAN |
93 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32)) | |
94 | #else | |
95 | #error "wut? Unknown __BYTE_ORDER?!" | |
96 | #endif | |
c99ee51a KC |
97 | |
98 | #define SIBLING_EXIT_UNKILLED 0xbadbeef | |
99 | #define SIBLING_EXIT_FAILURE 0xbadface | |
100 | #define SIBLING_EXIT_NEWPRIVS 0xbadfeed | |
101 | ||
102 | TEST(mode_strict_support) | |
103 | { | |
104 | long ret; | |
105 | ||
106 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
107 | ASSERT_EQ(0, ret) { | |
108 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
109 | } | |
110 | syscall(__NR_exit, 1); | |
111 | } | |
112 | ||
113 | TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL) | |
114 | { | |
115 | long ret; | |
116 | ||
117 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
118 | ASSERT_EQ(0, ret) { | |
119 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
120 | } | |
121 | syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
122 | NULL, NULL, NULL); | |
123 | EXPECT_FALSE(true) { | |
124 | TH_LOG("Unreachable!"); | |
125 | } | |
126 | } | |
127 | ||
128 | /* Note! This doesn't test no new privs behavior */ | |
129 | TEST(no_new_privs_support) | |
130 | { | |
131 | long ret; | |
132 | ||
133 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
134 | EXPECT_EQ(0, ret) { | |
135 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
136 | } | |
137 | } | |
138 | ||
139 | /* Tests kernel support by checking for a copy_from_user() fault on * NULL. */ | |
140 | TEST(mode_filter_support) | |
141 | { | |
142 | long ret; | |
143 | ||
144 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
145 | ASSERT_EQ(0, ret) { | |
146 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
147 | } | |
148 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL); | |
149 | EXPECT_EQ(-1, ret); | |
150 | EXPECT_EQ(EFAULT, errno) { | |
151 | TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!"); | |
152 | } | |
153 | } | |
154 | ||
155 | TEST(mode_filter_without_nnp) | |
156 | { | |
157 | struct sock_filter filter[] = { | |
158 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
159 | }; | |
160 | struct sock_fprog prog = { | |
161 | .len = (unsigned short)ARRAY_SIZE(filter), | |
162 | .filter = filter, | |
163 | }; | |
164 | long ret; | |
165 | ||
166 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0); | |
167 | ASSERT_LE(0, ret) { | |
168 | TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS"); | |
169 | } | |
170 | errno = 0; | |
171 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
172 | /* Succeeds with CAP_SYS_ADMIN, fails without */ | |
173 | /* TODO(wad) check caps not euid */ | |
174 | if (geteuid()) { | |
175 | EXPECT_EQ(-1, ret); | |
176 | EXPECT_EQ(EACCES, errno); | |
177 | } else { | |
178 | EXPECT_EQ(0, ret); | |
179 | } | |
180 | } | |
181 | ||
182 | #define MAX_INSNS_PER_PATH 32768 | |
183 | ||
184 | TEST(filter_size_limits) | |
185 | { | |
186 | int i; | |
187 | int count = BPF_MAXINSNS + 1; | |
188 | struct sock_filter allow[] = { | |
189 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
190 | }; | |
191 | struct sock_filter *filter; | |
192 | struct sock_fprog prog = { }; | |
193 | long ret; | |
194 | ||
195 | filter = calloc(count, sizeof(*filter)); | |
196 | ASSERT_NE(NULL, filter); | |
197 | ||
198 | for (i = 0; i < count; i++) | |
199 | filter[i] = allow[0]; | |
200 | ||
201 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
202 | ASSERT_EQ(0, ret); | |
203 | ||
204 | prog.filter = filter; | |
205 | prog.len = count; | |
206 | ||
207 | /* Too many filter instructions in a single filter. */ | |
208 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
209 | ASSERT_NE(0, ret) { | |
210 | TH_LOG("Installing %d insn filter was allowed", prog.len); | |
211 | } | |
212 | ||
213 | /* One less is okay, though. */ | |
214 | prog.len -= 1; | |
215 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
216 | ASSERT_EQ(0, ret) { | |
217 | TH_LOG("Installing %d insn filter wasn't allowed", prog.len); | |
218 | } | |
219 | } | |
220 | ||
221 | TEST(filter_chain_limits) | |
222 | { | |
223 | int i; | |
224 | int count = BPF_MAXINSNS; | |
225 | struct sock_filter allow[] = { | |
226 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
227 | }; | |
228 | struct sock_filter *filter; | |
229 | struct sock_fprog prog = { }; | |
230 | long ret; | |
231 | ||
232 | filter = calloc(count, sizeof(*filter)); | |
233 | ASSERT_NE(NULL, filter); | |
234 | ||
235 | for (i = 0; i < count; i++) | |
236 | filter[i] = allow[0]; | |
237 | ||
238 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
239 | ASSERT_EQ(0, ret); | |
240 | ||
241 | prog.filter = filter; | |
242 | prog.len = 1; | |
243 | ||
244 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
245 | ASSERT_EQ(0, ret); | |
246 | ||
247 | prog.len = count; | |
248 | ||
249 | /* Too many total filter instructions. */ | |
250 | for (i = 0; i < MAX_INSNS_PER_PATH; i++) { | |
251 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
252 | if (ret != 0) | |
253 | break; | |
254 | } | |
255 | ASSERT_NE(0, ret) { | |
256 | TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)", | |
257 | i, count, i * (count + 4)); | |
258 | } | |
259 | } | |
260 | ||
261 | TEST(mode_filter_cannot_move_to_strict) | |
262 | { | |
263 | struct sock_filter filter[] = { | |
264 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
265 | }; | |
266 | struct sock_fprog prog = { | |
267 | .len = (unsigned short)ARRAY_SIZE(filter), | |
268 | .filter = filter, | |
269 | }; | |
270 | long ret; | |
271 | ||
272 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
273 | ASSERT_EQ(0, ret); | |
274 | ||
275 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
276 | ASSERT_EQ(0, ret); | |
277 | ||
278 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0); | |
279 | EXPECT_EQ(-1, ret); | |
280 | EXPECT_EQ(EINVAL, errno); | |
281 | } | |
282 | ||
283 | ||
284 | TEST(mode_filter_get_seccomp) | |
285 | { | |
286 | struct sock_filter filter[] = { | |
287 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
288 | }; | |
289 | struct sock_fprog prog = { | |
290 | .len = (unsigned short)ARRAY_SIZE(filter), | |
291 | .filter = filter, | |
292 | }; | |
293 | long ret; | |
294 | ||
295 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
296 | ASSERT_EQ(0, ret); | |
297 | ||
298 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
299 | EXPECT_EQ(0, ret); | |
300 | ||
301 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
302 | ASSERT_EQ(0, ret); | |
303 | ||
304 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
305 | EXPECT_EQ(2, ret); | |
306 | } | |
307 | ||
308 | ||
309 | TEST(ALLOW_all) | |
310 | { | |
311 | struct sock_filter filter[] = { | |
312 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
313 | }; | |
314 | struct sock_fprog prog = { | |
315 | .len = (unsigned short)ARRAY_SIZE(filter), | |
316 | .filter = filter, | |
317 | }; | |
318 | long ret; | |
319 | ||
320 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
321 | ASSERT_EQ(0, ret); | |
322 | ||
323 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
324 | ASSERT_EQ(0, ret); | |
325 | } | |
326 | ||
327 | TEST(empty_prog) | |
328 | { | |
329 | struct sock_filter filter[] = { | |
330 | }; | |
331 | struct sock_fprog prog = { | |
332 | .len = (unsigned short)ARRAY_SIZE(filter), | |
333 | .filter = filter, | |
334 | }; | |
335 | long ret; | |
336 | ||
337 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
338 | ASSERT_EQ(0, ret); | |
339 | ||
340 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
341 | EXPECT_EQ(-1, ret); | |
342 | EXPECT_EQ(EINVAL, errno); | |
343 | } | |
344 | ||
345 | TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS) | |
346 | { | |
347 | struct sock_filter filter[] = { | |
348 | BPF_STMT(BPF_RET|BPF_K, 0x10000000U), | |
349 | }; | |
350 | struct sock_fprog prog = { | |
351 | .len = (unsigned short)ARRAY_SIZE(filter), | |
352 | .filter = filter, | |
353 | }; | |
354 | long ret; | |
355 | ||
356 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
357 | ASSERT_EQ(0, ret); | |
358 | ||
359 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
360 | ASSERT_EQ(0, ret); | |
361 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
362 | TH_LOG("getpid() shouldn't ever return"); | |
363 | } | |
364 | } | |
365 | ||
366 | /* return code >= 0x80000000 is unused. */ | |
367 | TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS) | |
368 | { | |
369 | struct sock_filter filter[] = { | |
370 | BPF_STMT(BPF_RET|BPF_K, 0x90000000U), | |
371 | }; | |
372 | struct sock_fprog prog = { | |
373 | .len = (unsigned short)ARRAY_SIZE(filter), | |
374 | .filter = filter, | |
375 | }; | |
376 | long ret; | |
377 | ||
378 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
379 | ASSERT_EQ(0, ret); | |
380 | ||
381 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
382 | ASSERT_EQ(0, ret); | |
383 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
384 | TH_LOG("getpid() shouldn't ever return"); | |
385 | } | |
386 | } | |
387 | ||
388 | TEST_SIGNAL(KILL_all, SIGSYS) | |
389 | { | |
390 | struct sock_filter filter[] = { | |
391 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
392 | }; | |
393 | struct sock_fprog prog = { | |
394 | .len = (unsigned short)ARRAY_SIZE(filter), | |
395 | .filter = filter, | |
396 | }; | |
397 | long ret; | |
398 | ||
399 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
400 | ASSERT_EQ(0, ret); | |
401 | ||
402 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
403 | ASSERT_EQ(0, ret); | |
404 | } | |
405 | ||
406 | TEST_SIGNAL(KILL_one, SIGSYS) | |
407 | { | |
408 | struct sock_filter filter[] = { | |
409 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
410 | offsetof(struct seccomp_data, nr)), | |
411 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
412 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
413 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
414 | }; | |
415 | struct sock_fprog prog = { | |
416 | .len = (unsigned short)ARRAY_SIZE(filter), | |
417 | .filter = filter, | |
418 | }; | |
419 | long ret; | |
420 | pid_t parent = getppid(); | |
421 | ||
422 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
423 | ASSERT_EQ(0, ret); | |
424 | ||
425 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
426 | ASSERT_EQ(0, ret); | |
427 | ||
428 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
429 | /* getpid() should never return. */ | |
430 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
431 | } | |
432 | ||
433 | TEST_SIGNAL(KILL_one_arg_one, SIGSYS) | |
434 | { | |
fd88d16c | 435 | void *fatal_address; |
c99ee51a KC |
436 | struct sock_filter filter[] = { |
437 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
438 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 439 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0), |
c99ee51a KC |
440 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
441 | /* Only both with lower 32-bit for now. */ | |
442 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)), | |
fd88d16c RS |
443 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, |
444 | (unsigned long)&fatal_address, 0, 1), | |
c99ee51a KC |
445 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), |
446 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
447 | }; | |
448 | struct sock_fprog prog = { | |
449 | .len = (unsigned short)ARRAY_SIZE(filter), | |
450 | .filter = filter, | |
451 | }; | |
452 | long ret; | |
453 | pid_t parent = getppid(); | |
fd88d16c RS |
454 | struct tms timebuf; |
455 | clock_t clock = times(&timebuf); | |
c99ee51a KC |
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 | ASSERT_EQ(0, ret); | |
462 | ||
463 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
fd88d16c RS |
464 | EXPECT_LE(clock, syscall(__NR_times, &timebuf)); |
465 | /* times() should never return. */ | |
466 | EXPECT_EQ(0, syscall(__NR_times, &fatal_address)); | |
c99ee51a KC |
467 | } |
468 | ||
469 | TEST_SIGNAL(KILL_one_arg_six, SIGSYS) | |
470 | { | |
fd88d16c RS |
471 | #ifndef __NR_mmap2 |
472 | int sysno = __NR_mmap; | |
473 | #else | |
474 | int sysno = __NR_mmap2; | |
475 | #endif | |
c99ee51a KC |
476 | struct sock_filter filter[] = { |
477 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
478 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 479 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0), |
c99ee51a KC |
480 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
481 | /* Only both with lower 32-bit for now. */ | |
482 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)), | |
483 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1), | |
484 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
485 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
486 | }; | |
487 | struct sock_fprog prog = { | |
488 | .len = (unsigned short)ARRAY_SIZE(filter), | |
489 | .filter = filter, | |
490 | }; | |
491 | long ret; | |
492 | pid_t parent = getppid(); | |
fd88d16c RS |
493 | int fd; |
494 | void *map1, *map2; | |
2ce47b44 BJZ |
495 | int page_size = sysconf(_SC_PAGESIZE); |
496 | ||
497 | ASSERT_LT(0, page_size); | |
c99ee51a KC |
498 | |
499 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
500 | ASSERT_EQ(0, ret); | |
501 | ||
502 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
503 | ASSERT_EQ(0, ret); | |
504 | ||
fd88d16c RS |
505 | fd = open("/dev/zero", O_RDONLY); |
506 | ASSERT_NE(-1, fd); | |
507 | ||
c99ee51a | 508 | EXPECT_EQ(parent, syscall(__NR_getppid)); |
fd88d16c | 509 | map1 = (void *)syscall(sysno, |
2ce47b44 | 510 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size); |
fd88d16c RS |
511 | EXPECT_NE(MAP_FAILED, map1); |
512 | /* mmap2() should never return. */ | |
513 | map2 = (void *)syscall(sysno, | |
2ce47b44 | 514 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE); |
fd88d16c RS |
515 | EXPECT_EQ(MAP_FAILED, map2); |
516 | ||
517 | /* The test failed, so clean up the resources. */ | |
2ce47b44 BJZ |
518 | munmap(map1, page_size); |
519 | munmap(map2, page_size); | |
fd88d16c | 520 | close(fd); |
c99ee51a KC |
521 | } |
522 | ||
523 | /* TODO(wad) add 64-bit versus 32-bit arg tests. */ | |
524 | TEST(arg_out_of_range) | |
525 | { | |
526 | struct sock_filter filter[] = { | |
527 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)), | |
528 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
529 | }; | |
530 | struct sock_fprog prog = { | |
531 | .len = (unsigned short)ARRAY_SIZE(filter), | |
532 | .filter = filter, | |
533 | }; | |
534 | long ret; | |
535 | ||
536 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
537 | ASSERT_EQ(0, ret); | |
538 | ||
539 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
540 | EXPECT_EQ(-1, ret); | |
541 | EXPECT_EQ(EINVAL, errno); | |
542 | } | |
543 | ||
544 | TEST(ERRNO_valid) | |
545 | { | |
546 | struct sock_filter filter[] = { | |
547 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
548 | offsetof(struct seccomp_data, nr)), | |
549 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
550 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | E2BIG), | |
551 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
552 | }; | |
553 | struct sock_fprog prog = { | |
554 | .len = (unsigned short)ARRAY_SIZE(filter), | |
555 | .filter = filter, | |
556 | }; | |
557 | long ret; | |
558 | pid_t parent = getppid(); | |
559 | ||
560 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
561 | ASSERT_EQ(0, ret); | |
562 | ||
563 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
564 | ASSERT_EQ(0, ret); | |
565 | ||
566 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
567 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
568 | EXPECT_EQ(E2BIG, errno); | |
569 | } | |
570 | ||
571 | TEST(ERRNO_zero) | |
572 | { | |
573 | struct sock_filter filter[] = { | |
574 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
575 | offsetof(struct seccomp_data, nr)), | |
576 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
577 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | 0), | |
578 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
579 | }; | |
580 | struct sock_fprog prog = { | |
581 | .len = (unsigned short)ARRAY_SIZE(filter), | |
582 | .filter = filter, | |
583 | }; | |
584 | long ret; | |
585 | pid_t parent = getppid(); | |
586 | ||
587 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
588 | ASSERT_EQ(0, ret); | |
589 | ||
590 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
591 | ASSERT_EQ(0, ret); | |
592 | ||
593 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
594 | /* "errno" of 0 is ok. */ | |
595 | EXPECT_EQ(0, read(0, NULL, 0)); | |
596 | } | |
597 | ||
598 | TEST(ERRNO_capped) | |
599 | { | |
600 | struct sock_filter filter[] = { | |
601 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
602 | offsetof(struct seccomp_data, nr)), | |
603 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
604 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | 4096), | |
605 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
606 | }; | |
607 | struct sock_fprog prog = { | |
608 | .len = (unsigned short)ARRAY_SIZE(filter), | |
609 | .filter = filter, | |
610 | }; | |
611 | long ret; | |
612 | pid_t parent = getppid(); | |
613 | ||
614 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
615 | ASSERT_EQ(0, ret); | |
616 | ||
617 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
618 | ASSERT_EQ(0, ret); | |
619 | ||
620 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
621 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
622 | EXPECT_EQ(4095, errno); | |
623 | } | |
624 | ||
625 | FIXTURE_DATA(TRAP) { | |
626 | struct sock_fprog prog; | |
627 | }; | |
628 | ||
629 | FIXTURE_SETUP(TRAP) | |
630 | { | |
631 | struct sock_filter filter[] = { | |
632 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
633 | offsetof(struct seccomp_data, nr)), | |
634 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
635 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
636 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
637 | }; | |
638 | ||
639 | memset(&self->prog, 0, sizeof(self->prog)); | |
640 | self->prog.filter = malloc(sizeof(filter)); | |
641 | ASSERT_NE(NULL, self->prog.filter); | |
642 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
643 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
644 | } | |
645 | ||
646 | FIXTURE_TEARDOWN(TRAP) | |
647 | { | |
648 | if (self->prog.filter) | |
649 | free(self->prog.filter); | |
650 | } | |
651 | ||
652 | TEST_F_SIGNAL(TRAP, dfl, SIGSYS) | |
653 | { | |
654 | long ret; | |
655 | ||
656 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
657 | ASSERT_EQ(0, ret); | |
658 | ||
659 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
660 | ASSERT_EQ(0, ret); | |
661 | syscall(__NR_getpid); | |
662 | } | |
663 | ||
664 | /* Ensure that SIGSYS overrides SIG_IGN */ | |
665 | TEST_F_SIGNAL(TRAP, ign, SIGSYS) | |
666 | { | |
667 | long ret; | |
668 | ||
669 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
670 | ASSERT_EQ(0, ret); | |
671 | ||
672 | signal(SIGSYS, SIG_IGN); | |
673 | ||
674 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
675 | ASSERT_EQ(0, ret); | |
676 | syscall(__NR_getpid); | |
677 | } | |
678 | ||
679 | static struct siginfo TRAP_info; | |
680 | static volatile int TRAP_nr; | |
681 | static void TRAP_action(int nr, siginfo_t *info, void *void_context) | |
682 | { | |
683 | memcpy(&TRAP_info, info, sizeof(TRAP_info)); | |
684 | TRAP_nr = nr; | |
685 | } | |
686 | ||
687 | TEST_F(TRAP, handler) | |
688 | { | |
689 | int ret, test; | |
690 | struct sigaction act; | |
691 | sigset_t mask; | |
692 | ||
693 | memset(&act, 0, sizeof(act)); | |
694 | sigemptyset(&mask); | |
695 | sigaddset(&mask, SIGSYS); | |
696 | ||
697 | act.sa_sigaction = &TRAP_action; | |
698 | act.sa_flags = SA_SIGINFO; | |
699 | ret = sigaction(SIGSYS, &act, NULL); | |
700 | ASSERT_EQ(0, ret) { | |
701 | TH_LOG("sigaction failed"); | |
702 | } | |
703 | ret = sigprocmask(SIG_UNBLOCK, &mask, NULL); | |
704 | ASSERT_EQ(0, ret) { | |
705 | TH_LOG("sigprocmask failed"); | |
706 | } | |
707 | ||
708 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
709 | ASSERT_EQ(0, ret); | |
710 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
711 | ASSERT_EQ(0, ret); | |
712 | TRAP_nr = 0; | |
713 | memset(&TRAP_info, 0, sizeof(TRAP_info)); | |
714 | /* Expect the registers to be rolled back. (nr = error) may vary | |
715 | * based on arch. */ | |
716 | ret = syscall(__NR_getpid); | |
717 | /* Silence gcc warning about volatile. */ | |
718 | test = TRAP_nr; | |
719 | EXPECT_EQ(SIGSYS, test); | |
720 | struct local_sigsys { | |
721 | void *_call_addr; /* calling user insn */ | |
722 | int _syscall; /* triggering system call number */ | |
723 | unsigned int _arch; /* AUDIT_ARCH_* of syscall */ | |
724 | } *sigsys = (struct local_sigsys *) | |
725 | #ifdef si_syscall | |
726 | &(TRAP_info.si_call_addr); | |
727 | #else | |
728 | &TRAP_info.si_pid; | |
729 | #endif | |
730 | EXPECT_EQ(__NR_getpid, sigsys->_syscall); | |
731 | /* Make sure arch is non-zero. */ | |
732 | EXPECT_NE(0, sigsys->_arch); | |
733 | EXPECT_NE(0, (unsigned long)sigsys->_call_addr); | |
734 | } | |
735 | ||
736 | FIXTURE_DATA(precedence) { | |
737 | struct sock_fprog allow; | |
738 | struct sock_fprog trace; | |
739 | struct sock_fprog error; | |
740 | struct sock_fprog trap; | |
741 | struct sock_fprog kill; | |
742 | }; | |
743 | ||
744 | FIXTURE_SETUP(precedence) | |
745 | { | |
746 | struct sock_filter allow_insns[] = { | |
747 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
748 | }; | |
749 | struct sock_filter trace_insns[] = { | |
750 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
751 | offsetof(struct seccomp_data, nr)), | |
752 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
753 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
754 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE), | |
755 | }; | |
756 | struct sock_filter error_insns[] = { | |
757 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
758 | offsetof(struct seccomp_data, nr)), | |
759 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
760 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
761 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO), | |
762 | }; | |
763 | struct sock_filter trap_insns[] = { | |
764 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
765 | offsetof(struct seccomp_data, nr)), | |
766 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
767 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
768 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
769 | }; | |
770 | struct sock_filter kill_insns[] = { | |
771 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
772 | offsetof(struct seccomp_data, nr)), | |
773 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
774 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
775 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
776 | }; | |
777 | ||
778 | memset(self, 0, sizeof(*self)); | |
779 | #define FILTER_ALLOC(_x) \ | |
780 | self->_x.filter = malloc(sizeof(_x##_insns)); \ | |
781 | ASSERT_NE(NULL, self->_x.filter); \ | |
782 | memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \ | |
783 | self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns) | |
784 | FILTER_ALLOC(allow); | |
785 | FILTER_ALLOC(trace); | |
786 | FILTER_ALLOC(error); | |
787 | FILTER_ALLOC(trap); | |
788 | FILTER_ALLOC(kill); | |
789 | } | |
790 | ||
791 | FIXTURE_TEARDOWN(precedence) | |
792 | { | |
793 | #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter) | |
794 | FILTER_FREE(allow); | |
795 | FILTER_FREE(trace); | |
796 | FILTER_FREE(error); | |
797 | FILTER_FREE(trap); | |
798 | FILTER_FREE(kill); | |
799 | } | |
800 | ||
801 | TEST_F(precedence, allow_ok) | |
802 | { | |
803 | pid_t parent, res = 0; | |
804 | long ret; | |
805 | ||
806 | parent = getppid(); | |
807 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
808 | ASSERT_EQ(0, ret); | |
809 | ||
810 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
811 | ASSERT_EQ(0, ret); | |
812 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
813 | ASSERT_EQ(0, ret); | |
814 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
815 | ASSERT_EQ(0, ret); | |
816 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
817 | ASSERT_EQ(0, ret); | |
818 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
819 | ASSERT_EQ(0, ret); | |
820 | /* Should work just fine. */ | |
821 | res = syscall(__NR_getppid); | |
822 | EXPECT_EQ(parent, res); | |
823 | } | |
824 | ||
825 | TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS) | |
826 | { | |
827 | pid_t parent, res = 0; | |
828 | long ret; | |
829 | ||
830 | parent = getppid(); | |
831 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
832 | ASSERT_EQ(0, ret); | |
833 | ||
834 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
835 | ASSERT_EQ(0, ret); | |
836 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
837 | ASSERT_EQ(0, ret); | |
838 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
839 | ASSERT_EQ(0, ret); | |
840 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
841 | ASSERT_EQ(0, ret); | |
842 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
843 | ASSERT_EQ(0, ret); | |
844 | /* Should work just fine. */ | |
845 | res = syscall(__NR_getppid); | |
846 | EXPECT_EQ(parent, res); | |
847 | /* getpid() should never return. */ | |
848 | res = syscall(__NR_getpid); | |
849 | EXPECT_EQ(0, res); | |
850 | } | |
851 | ||
852 | TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS) | |
853 | { | |
854 | pid_t parent; | |
855 | long ret; | |
856 | ||
857 | parent = getppid(); | |
858 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
859 | ASSERT_EQ(0, ret); | |
860 | ||
861 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
862 | ASSERT_EQ(0, ret); | |
863 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
864 | ASSERT_EQ(0, ret); | |
865 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
866 | ASSERT_EQ(0, ret); | |
867 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
868 | ASSERT_EQ(0, ret); | |
869 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
870 | ASSERT_EQ(0, ret); | |
871 | /* Should work just fine. */ | |
872 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
873 | /* getpid() should never return. */ | |
874 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
875 | } | |
876 | ||
877 | TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS) | |
878 | { | |
879 | pid_t parent; | |
880 | long ret; | |
881 | ||
882 | parent = getppid(); | |
883 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
884 | ASSERT_EQ(0, ret); | |
885 | ||
886 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
887 | ASSERT_EQ(0, ret); | |
888 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
889 | ASSERT_EQ(0, ret); | |
890 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
891 | ASSERT_EQ(0, ret); | |
892 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
893 | ASSERT_EQ(0, ret); | |
894 | /* Should work just fine. */ | |
895 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
896 | /* getpid() should never return. */ | |
897 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
898 | } | |
899 | ||
900 | TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS) | |
901 | { | |
902 | pid_t parent; | |
903 | long ret; | |
904 | ||
905 | parent = getppid(); | |
906 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
907 | ASSERT_EQ(0, ret); | |
908 | ||
909 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
910 | ASSERT_EQ(0, ret); | |
911 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
912 | ASSERT_EQ(0, ret); | |
913 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
914 | ASSERT_EQ(0, ret); | |
915 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
916 | ASSERT_EQ(0, ret); | |
917 | /* Should work just fine. */ | |
918 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
919 | /* getpid() should never return. */ | |
920 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
921 | } | |
922 | ||
923 | TEST_F(precedence, errno_is_third) | |
924 | { | |
925 | pid_t parent; | |
926 | long ret; | |
927 | ||
928 | parent = getppid(); | |
929 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
930 | ASSERT_EQ(0, ret); | |
931 | ||
932 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
933 | ASSERT_EQ(0, ret); | |
934 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
935 | ASSERT_EQ(0, ret); | |
936 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
937 | ASSERT_EQ(0, ret); | |
938 | /* Should work just fine. */ | |
939 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
940 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
941 | } | |
942 | ||
943 | TEST_F(precedence, errno_is_third_in_any_order) | |
944 | { | |
945 | pid_t parent; | |
946 | long ret; | |
947 | ||
948 | parent = getppid(); | |
949 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
950 | ASSERT_EQ(0, ret); | |
951 | ||
952 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
953 | ASSERT_EQ(0, ret); | |
954 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
955 | ASSERT_EQ(0, ret); | |
956 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
957 | ASSERT_EQ(0, ret); | |
958 | /* Should work just fine. */ | |
959 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
960 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
961 | } | |
962 | ||
963 | TEST_F(precedence, trace_is_fourth) | |
964 | { | |
965 | pid_t parent; | |
966 | long ret; | |
967 | ||
968 | parent = getppid(); | |
969 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
970 | ASSERT_EQ(0, ret); | |
971 | ||
972 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
973 | ASSERT_EQ(0, ret); | |
974 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
975 | ASSERT_EQ(0, ret); | |
976 | /* Should work just fine. */ | |
977 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
978 | /* No ptracer */ | |
979 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
980 | } | |
981 | ||
982 | TEST_F(precedence, trace_is_fourth_in_any_order) | |
983 | { | |
984 | pid_t parent; | |
985 | long ret; | |
986 | ||
987 | parent = getppid(); | |
988 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
989 | ASSERT_EQ(0, ret); | |
990 | ||
991 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
992 | ASSERT_EQ(0, ret); | |
993 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
994 | ASSERT_EQ(0, ret); | |
995 | /* Should work just fine. */ | |
996 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
997 | /* No ptracer */ | |
998 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
999 | } | |
1000 | ||
1001 | #ifndef PTRACE_O_TRACESECCOMP | |
1002 | #define PTRACE_O_TRACESECCOMP 0x00000080 | |
1003 | #endif | |
1004 | ||
1005 | /* Catch the Ubuntu 12.04 value error. */ | |
1006 | #if PTRACE_EVENT_SECCOMP != 7 | |
1007 | #undef PTRACE_EVENT_SECCOMP | |
1008 | #endif | |
1009 | ||
1010 | #ifndef PTRACE_EVENT_SECCOMP | |
1011 | #define PTRACE_EVENT_SECCOMP 7 | |
1012 | #endif | |
1013 | ||
1014 | #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP) | |
1015 | bool tracer_running; | |
1016 | void tracer_stop(int sig) | |
1017 | { | |
1018 | tracer_running = false; | |
1019 | } | |
1020 | ||
1021 | typedef void tracer_func_t(struct __test_metadata *_metadata, | |
1022 | pid_t tracee, int status, void *args); | |
1023 | ||
1024 | void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee, | |
1025 | tracer_func_t tracer_func, void *args) | |
1026 | { | |
1027 | int ret = -1; | |
1028 | struct sigaction action = { | |
1029 | .sa_handler = tracer_stop, | |
1030 | }; | |
1031 | ||
1032 | /* Allow external shutdown. */ | |
1033 | tracer_running = true; | |
1034 | ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL)); | |
1035 | ||
1036 | errno = 0; | |
1037 | while (ret == -1 && errno != EINVAL) | |
1038 | ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0); | |
1039 | ASSERT_EQ(0, ret) { | |
1040 | kill(tracee, SIGKILL); | |
1041 | } | |
1042 | /* Wait for attach stop */ | |
1043 | wait(NULL); | |
1044 | ||
1045 | ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, PTRACE_O_TRACESECCOMP); | |
1046 | ASSERT_EQ(0, ret) { | |
1047 | TH_LOG("Failed to set PTRACE_O_TRACESECCOMP"); | |
1048 | kill(tracee, SIGKILL); | |
1049 | } | |
1050 | ptrace(PTRACE_CONT, tracee, NULL, 0); | |
1051 | ||
1052 | /* Unblock the tracee */ | |
1053 | ASSERT_EQ(1, write(fd, "A", 1)); | |
1054 | ASSERT_EQ(0, close(fd)); | |
1055 | ||
1056 | /* Run until we're shut down. Must assert to stop execution. */ | |
1057 | while (tracer_running) { | |
1058 | int status; | |
1059 | ||
1060 | if (wait(&status) != tracee) | |
1061 | continue; | |
1062 | if (WIFSIGNALED(status) || WIFEXITED(status)) | |
1063 | /* Child is dead. Time to go. */ | |
1064 | return; | |
1065 | ||
1066 | /* Make sure this is a seccomp event. */ | |
1067 | ASSERT_EQ(true, IS_SECCOMP_EVENT(status)); | |
1068 | ||
1069 | tracer_func(_metadata, tracee, status, args); | |
1070 | ||
1071 | ret = ptrace(PTRACE_CONT, tracee, NULL, NULL); | |
1072 | ASSERT_EQ(0, ret); | |
1073 | } | |
1074 | /* Directly report the status of our test harness results. */ | |
1075 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); | |
1076 | } | |
1077 | ||
1078 | /* Common tracer setup/teardown functions. */ | |
1079 | void cont_handler(int num) | |
1080 | { } | |
1081 | pid_t setup_trace_fixture(struct __test_metadata *_metadata, | |
1082 | tracer_func_t func, void *args) | |
1083 | { | |
1084 | char sync; | |
1085 | int pipefd[2]; | |
1086 | pid_t tracer_pid; | |
1087 | pid_t tracee = getpid(); | |
1088 | ||
1089 | /* Setup a pipe for clean synchronization. */ | |
1090 | ASSERT_EQ(0, pipe(pipefd)); | |
1091 | ||
1092 | /* Fork a child which we'll promote to tracer */ | |
1093 | tracer_pid = fork(); | |
1094 | ASSERT_LE(0, tracer_pid); | |
1095 | signal(SIGALRM, cont_handler); | |
1096 | if (tracer_pid == 0) { | |
1097 | close(pipefd[0]); | |
1098 | tracer(_metadata, pipefd[1], tracee, func, args); | |
1099 | syscall(__NR_exit, 0); | |
1100 | } | |
1101 | close(pipefd[1]); | |
1102 | prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0); | |
1103 | read(pipefd[0], &sync, 1); | |
1104 | close(pipefd[0]); | |
1105 | ||
1106 | return tracer_pid; | |
1107 | } | |
1108 | void teardown_trace_fixture(struct __test_metadata *_metadata, | |
1109 | pid_t tracer) | |
1110 | { | |
1111 | if (tracer) { | |
1112 | int status; | |
1113 | /* | |
1114 | * Extract the exit code from the other process and | |
1115 | * adopt it for ourselves in case its asserts failed. | |
1116 | */ | |
1117 | ASSERT_EQ(0, kill(tracer, SIGUSR1)); | |
1118 | ASSERT_EQ(tracer, waitpid(tracer, &status, 0)); | |
1119 | if (WEXITSTATUS(status)) | |
1120 | _metadata->passed = 0; | |
1121 | } | |
1122 | } | |
1123 | ||
1124 | /* "poke" tracer arguments and function. */ | |
1125 | struct tracer_args_poke_t { | |
1126 | unsigned long poke_addr; | |
1127 | }; | |
1128 | ||
1129 | void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status, | |
1130 | void *args) | |
1131 | { | |
1132 | int ret; | |
1133 | unsigned long msg; | |
1134 | struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args; | |
1135 | ||
1136 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1137 | EXPECT_EQ(0, ret); | |
1138 | /* If this fails, don't try to recover. */ | |
1139 | ASSERT_EQ(0x1001, msg) { | |
1140 | kill(tracee, SIGKILL); | |
1141 | } | |
1142 | /* | |
1143 | * Poke in the message. | |
1144 | * Registers are not touched to try to keep this relatively arch | |
1145 | * agnostic. | |
1146 | */ | |
1147 | ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001); | |
1148 | EXPECT_EQ(0, ret); | |
1149 | } | |
1150 | ||
1151 | FIXTURE_DATA(TRACE_poke) { | |
1152 | struct sock_fprog prog; | |
1153 | pid_t tracer; | |
1154 | long poked; | |
1155 | struct tracer_args_poke_t tracer_args; | |
1156 | }; | |
1157 | ||
1158 | FIXTURE_SETUP(TRACE_poke) | |
1159 | { | |
1160 | struct sock_filter filter[] = { | |
1161 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1162 | offsetof(struct seccomp_data, nr)), | |
1163 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
1164 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001), | |
1165 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1166 | }; | |
1167 | ||
1168 | self->poked = 0; | |
1169 | memset(&self->prog, 0, sizeof(self->prog)); | |
1170 | self->prog.filter = malloc(sizeof(filter)); | |
1171 | ASSERT_NE(NULL, self->prog.filter); | |
1172 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1173 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1174 | ||
1175 | /* Set up tracer args. */ | |
1176 | self->tracer_args.poke_addr = (unsigned long)&self->poked; | |
1177 | ||
1178 | /* Launch tracer. */ | |
1179 | self->tracer = setup_trace_fixture(_metadata, tracer_poke, | |
1180 | &self->tracer_args); | |
1181 | } | |
1182 | ||
1183 | FIXTURE_TEARDOWN(TRACE_poke) | |
1184 | { | |
1185 | teardown_trace_fixture(_metadata, self->tracer); | |
1186 | if (self->prog.filter) | |
1187 | free(self->prog.filter); | |
1188 | } | |
1189 | ||
1190 | TEST_F(TRACE_poke, read_has_side_effects) | |
1191 | { | |
1192 | ssize_t ret; | |
1193 | ||
1194 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1195 | ASSERT_EQ(0, ret); | |
1196 | ||
1197 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1198 | ASSERT_EQ(0, ret); | |
1199 | ||
1200 | EXPECT_EQ(0, self->poked); | |
1201 | ret = read(-1, NULL, 0); | |
1202 | EXPECT_EQ(-1, ret); | |
1203 | EXPECT_EQ(0x1001, self->poked); | |
1204 | } | |
1205 | ||
1206 | TEST_F(TRACE_poke, getpid_runs_normally) | |
1207 | { | |
1208 | long ret; | |
1209 | ||
1210 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1211 | ASSERT_EQ(0, ret); | |
1212 | ||
1213 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1214 | ASSERT_EQ(0, ret); | |
1215 | ||
1216 | EXPECT_EQ(0, self->poked); | |
1217 | EXPECT_NE(0, syscall(__NR_getpid)); | |
1218 | EXPECT_EQ(0, self->poked); | |
1219 | } | |
1220 | ||
1221 | #if defined(__x86_64__) | |
1222 | # define ARCH_REGS struct user_regs_struct | |
1223 | # define SYSCALL_NUM orig_rax | |
1224 | # define SYSCALL_RET rax | |
1225 | #elif defined(__i386__) | |
1226 | # define ARCH_REGS struct user_regs_struct | |
1227 | # define SYSCALL_NUM orig_eax | |
1228 | # define SYSCALL_RET eax | |
1229 | #elif defined(__arm__) | |
1230 | # define ARCH_REGS struct pt_regs | |
1231 | # define SYSCALL_NUM ARM_r7 | |
1232 | # define SYSCALL_RET ARM_r0 | |
1233 | #elif defined(__aarch64__) | |
1234 | # define ARCH_REGS struct user_pt_regs | |
1235 | # define SYSCALL_NUM regs[8] | |
1236 | # define SYSCALL_RET regs[0] | |
5d83c2b3 ME |
1237 | #elif defined(__powerpc__) |
1238 | # define ARCH_REGS struct pt_regs | |
1239 | # define SYSCALL_NUM gpr[0] | |
1240 | # define SYSCALL_RET gpr[3] | |
b623c4da KC |
1241 | #elif defined(__s390__) |
1242 | # define ARCH_REGS s390_regs | |
1243 | # define SYSCALL_NUM gprs[2] | |
1244 | # define SYSCALL_RET gprs[2] | |
c99ee51a KC |
1245 | #else |
1246 | # error "Do not know how to find your architecture's registers and syscalls" | |
1247 | #endif | |
1248 | ||
1249 | /* Architecture-specific syscall fetching routine. */ | |
1250 | int get_syscall(struct __test_metadata *_metadata, pid_t tracee) | |
1251 | { | |
1252 | struct iovec iov; | |
1253 | ARCH_REGS regs; | |
1254 | ||
1255 | iov.iov_base = ®s; | |
1256 | iov.iov_len = sizeof(regs); | |
1257 | EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) { | |
1258 | TH_LOG("PTRACE_GETREGSET failed"); | |
1259 | return -1; | |
1260 | } | |
1261 | ||
1262 | return regs.SYSCALL_NUM; | |
1263 | } | |
1264 | ||
1265 | /* Architecture-specific syscall changing routine. */ | |
1266 | void change_syscall(struct __test_metadata *_metadata, | |
1267 | pid_t tracee, int syscall) | |
1268 | { | |
1269 | struct iovec iov; | |
1270 | int ret; | |
1271 | ARCH_REGS regs; | |
1272 | ||
1273 | iov.iov_base = ®s; | |
1274 | iov.iov_len = sizeof(regs); | |
1275 | ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov); | |
1276 | EXPECT_EQ(0, ret); | |
1277 | ||
256d0afb KC |
1278 | #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \ |
1279 | defined(__s390__) | |
c99ee51a KC |
1280 | { |
1281 | regs.SYSCALL_NUM = syscall; | |
1282 | } | |
1283 | ||
1284 | #elif defined(__arm__) | |
1285 | # ifndef PTRACE_SET_SYSCALL | |
1286 | # define PTRACE_SET_SYSCALL 23 | |
1287 | # endif | |
1288 | { | |
1289 | ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall); | |
1290 | EXPECT_EQ(0, ret); | |
1291 | } | |
1292 | ||
256d0afb KC |
1293 | #elif defined(__aarch64__) |
1294 | # ifndef NT_ARM_SYSTEM_CALL | |
1295 | # define NT_ARM_SYSTEM_CALL 0x404 | |
1296 | # endif | |
1297 | { | |
1298 | iov.iov_base = &syscall; | |
1299 | iov.iov_len = sizeof(syscall); | |
1300 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL, | |
1301 | &iov); | |
1302 | EXPECT_EQ(0, ret); | |
1303 | } | |
1304 | ||
c99ee51a KC |
1305 | #else |
1306 | ASSERT_EQ(1, 0) { | |
1307 | TH_LOG("How is the syscall changed on this architecture?"); | |
1308 | } | |
1309 | #endif | |
1310 | ||
1311 | /* If syscall is skipped, change return value. */ | |
1312 | if (syscall == -1) | |
1313 | regs.SYSCALL_RET = 1; | |
1314 | ||
256d0afb KC |
1315 | iov.iov_base = ®s; |
1316 | iov.iov_len = sizeof(regs); | |
c99ee51a KC |
1317 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov); |
1318 | EXPECT_EQ(0, ret); | |
1319 | } | |
1320 | ||
1321 | void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee, | |
1322 | int status, void *args) | |
1323 | { | |
1324 | int ret; | |
1325 | unsigned long msg; | |
1326 | ||
1327 | /* Make sure we got the right message. */ | |
1328 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1329 | EXPECT_EQ(0, ret); | |
1330 | ||
b623c4da | 1331 | /* Validate and take action on expected syscalls. */ |
c99ee51a KC |
1332 | switch (msg) { |
1333 | case 0x1002: | |
1334 | /* change getpid to getppid. */ | |
b623c4da | 1335 | EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1336 | change_syscall(_metadata, tracee, __NR_getppid); |
1337 | break; | |
1338 | case 0x1003: | |
1339 | /* skip gettid. */ | |
b623c4da | 1340 | EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1341 | change_syscall(_metadata, tracee, -1); |
1342 | break; | |
1343 | case 0x1004: | |
1344 | /* do nothing (allow getppid) */ | |
b623c4da | 1345 | EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1346 | break; |
1347 | default: | |
1348 | EXPECT_EQ(0, msg) { | |
1349 | TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg); | |
1350 | kill(tracee, SIGKILL); | |
1351 | } | |
1352 | } | |
1353 | ||
1354 | } | |
1355 | ||
1356 | FIXTURE_DATA(TRACE_syscall) { | |
1357 | struct sock_fprog prog; | |
1358 | pid_t tracer, mytid, mypid, parent; | |
1359 | }; | |
1360 | ||
1361 | FIXTURE_SETUP(TRACE_syscall) | |
1362 | { | |
1363 | struct sock_filter filter[] = { | |
1364 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1365 | offsetof(struct seccomp_data, nr)), | |
1366 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
1367 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002), | |
1368 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1), | |
1369 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003), | |
1370 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1371 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004), | |
1372 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1373 | }; | |
1374 | ||
1375 | memset(&self->prog, 0, sizeof(self->prog)); | |
1376 | self->prog.filter = malloc(sizeof(filter)); | |
1377 | ASSERT_NE(NULL, self->prog.filter); | |
1378 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1379 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1380 | ||
1381 | /* Prepare some testable syscall results. */ | |
1382 | self->mytid = syscall(__NR_gettid); | |
1383 | ASSERT_GT(self->mytid, 0); | |
1384 | ASSERT_NE(self->mytid, 1) { | |
1385 | TH_LOG("Running this test as init is not supported. :)"); | |
1386 | } | |
1387 | ||
1388 | self->mypid = getpid(); | |
1389 | ASSERT_GT(self->mypid, 0); | |
1390 | ASSERT_EQ(self->mytid, self->mypid); | |
1391 | ||
1392 | self->parent = getppid(); | |
1393 | ASSERT_GT(self->parent, 0); | |
1394 | ASSERT_NE(self->parent, self->mypid); | |
1395 | ||
1396 | /* Launch tracer. */ | |
1397 | self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL); | |
1398 | } | |
1399 | ||
1400 | FIXTURE_TEARDOWN(TRACE_syscall) | |
1401 | { | |
1402 | teardown_trace_fixture(_metadata, self->tracer); | |
1403 | if (self->prog.filter) | |
1404 | free(self->prog.filter); | |
1405 | } | |
1406 | ||
1407 | TEST_F(TRACE_syscall, syscall_allowed) | |
1408 | { | |
1409 | long ret; | |
1410 | ||
1411 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1412 | ASSERT_EQ(0, ret); | |
1413 | ||
1414 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1415 | ASSERT_EQ(0, ret); | |
1416 | ||
1417 | /* getppid works as expected (no changes). */ | |
1418 | EXPECT_EQ(self->parent, syscall(__NR_getppid)); | |
1419 | EXPECT_NE(self->mypid, syscall(__NR_getppid)); | |
1420 | } | |
1421 | ||
1422 | TEST_F(TRACE_syscall, syscall_redirected) | |
1423 | { | |
1424 | long ret; | |
1425 | ||
1426 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1427 | ASSERT_EQ(0, ret); | |
1428 | ||
1429 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1430 | ASSERT_EQ(0, ret); | |
1431 | ||
1432 | /* getpid has been redirected to getppid as expected. */ | |
1433 | EXPECT_EQ(self->parent, syscall(__NR_getpid)); | |
1434 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1435 | } | |
1436 | ||
1437 | TEST_F(TRACE_syscall, syscall_dropped) | |
1438 | { | |
1439 | long ret; | |
1440 | ||
1441 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1442 | ASSERT_EQ(0, ret); | |
1443 | ||
1444 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1445 | ASSERT_EQ(0, ret); | |
1446 | ||
1447 | /* gettid has been skipped and an altered return value stored. */ | |
1448 | EXPECT_EQ(1, syscall(__NR_gettid)); | |
1449 | EXPECT_NE(self->mytid, syscall(__NR_gettid)); | |
1450 | } | |
1451 | ||
1452 | #ifndef __NR_seccomp | |
1453 | # if defined(__i386__) | |
1454 | # define __NR_seccomp 354 | |
1455 | # elif defined(__x86_64__) | |
1456 | # define __NR_seccomp 317 | |
1457 | # elif defined(__arm__) | |
1458 | # define __NR_seccomp 383 | |
1459 | # elif defined(__aarch64__) | |
1460 | # define __NR_seccomp 277 | |
5d83c2b3 ME |
1461 | # elif defined(__powerpc__) |
1462 | # define __NR_seccomp 358 | |
b623c4da KC |
1463 | # elif defined(__s390__) |
1464 | # define __NR_seccomp 348 | |
c99ee51a KC |
1465 | # else |
1466 | # warning "seccomp syscall number unknown for this architecture" | |
1467 | # define __NR_seccomp 0xffff | |
1468 | # endif | |
1469 | #endif | |
1470 | ||
1471 | #ifndef SECCOMP_SET_MODE_STRICT | |
1472 | #define SECCOMP_SET_MODE_STRICT 0 | |
1473 | #endif | |
1474 | ||
1475 | #ifndef SECCOMP_SET_MODE_FILTER | |
1476 | #define SECCOMP_SET_MODE_FILTER 1 | |
1477 | #endif | |
1478 | ||
1479 | #ifndef SECCOMP_FLAG_FILTER_TSYNC | |
1480 | #define SECCOMP_FLAG_FILTER_TSYNC 1 | |
1481 | #endif | |
1482 | ||
1483 | #ifndef seccomp | |
1484 | int seccomp(unsigned int op, unsigned int flags, struct sock_fprog *filter) | |
1485 | { | |
1486 | errno = 0; | |
1487 | return syscall(__NR_seccomp, op, flags, filter); | |
1488 | } | |
1489 | #endif | |
1490 | ||
1491 | TEST(seccomp_syscall) | |
1492 | { | |
1493 | struct sock_filter filter[] = { | |
1494 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1495 | }; | |
1496 | struct sock_fprog prog = { | |
1497 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1498 | .filter = filter, | |
1499 | }; | |
1500 | long ret; | |
1501 | ||
1502 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1503 | ASSERT_EQ(0, ret) { | |
1504 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1505 | } | |
1506 | ||
1507 | /* Reject insane operation. */ | |
1508 | ret = seccomp(-1, 0, &prog); | |
b623c4da KC |
1509 | ASSERT_NE(ENOSYS, errno) { |
1510 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1511 | } | |
c99ee51a KC |
1512 | EXPECT_EQ(EINVAL, errno) { |
1513 | TH_LOG("Did not reject crazy op value!"); | |
1514 | } | |
1515 | ||
1516 | /* Reject strict with flags or pointer. */ | |
1517 | ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL); | |
1518 | EXPECT_EQ(EINVAL, errno) { | |
1519 | TH_LOG("Did not reject mode strict with flags!"); | |
1520 | } | |
1521 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog); | |
1522 | EXPECT_EQ(EINVAL, errno) { | |
1523 | TH_LOG("Did not reject mode strict with uargs!"); | |
1524 | } | |
1525 | ||
1526 | /* Reject insane args for filter. */ | |
1527 | ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog); | |
1528 | EXPECT_EQ(EINVAL, errno) { | |
1529 | TH_LOG("Did not reject crazy filter flags!"); | |
1530 | } | |
1531 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL); | |
1532 | EXPECT_EQ(EFAULT, errno) { | |
1533 | TH_LOG("Did not reject NULL filter!"); | |
1534 | } | |
1535 | ||
1536 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
1537 | EXPECT_EQ(0, errno) { | |
1538 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s", | |
1539 | strerror(errno)); | |
1540 | } | |
1541 | } | |
1542 | ||
1543 | TEST(seccomp_syscall_mode_lock) | |
1544 | { | |
1545 | struct sock_filter filter[] = { | |
1546 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1547 | }; | |
1548 | struct sock_fprog prog = { | |
1549 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1550 | .filter = filter, | |
1551 | }; | |
1552 | long ret; | |
1553 | ||
1554 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
1555 | ASSERT_EQ(0, ret) { | |
1556 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1557 | } | |
1558 | ||
1559 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
1560 | ASSERT_NE(ENOSYS, errno) { |
1561 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1562 | } | |
c99ee51a KC |
1563 | EXPECT_EQ(0, ret) { |
1564 | TH_LOG("Could not install filter!"); | |
1565 | } | |
1566 | ||
1567 | /* Make sure neither entry point will switch to strict. */ | |
1568 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0); | |
1569 | EXPECT_EQ(EINVAL, errno) { | |
1570 | TH_LOG("Switched to mode strict!"); | |
1571 | } | |
1572 | ||
1573 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL); | |
1574 | EXPECT_EQ(EINVAL, errno) { | |
1575 | TH_LOG("Switched to mode strict!"); | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | TEST(TSYNC_first) | |
1580 | { | |
1581 | struct sock_filter filter[] = { | |
1582 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1583 | }; | |
1584 | struct sock_fprog prog = { | |
1585 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1586 | .filter = filter, | |
1587 | }; | |
1588 | long ret; | |
1589 | ||
1590 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
1591 | ASSERT_EQ(0, ret) { | |
1592 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1593 | } | |
1594 | ||
1595 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
1596 | &prog); | |
b623c4da KC |
1597 | ASSERT_NE(ENOSYS, errno) { |
1598 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1599 | } | |
c99ee51a KC |
1600 | EXPECT_EQ(0, ret) { |
1601 | TH_LOG("Could not install initial filter with TSYNC!"); | |
1602 | } | |
1603 | } | |
1604 | ||
1605 | #define TSYNC_SIBLINGS 2 | |
1606 | struct tsync_sibling { | |
1607 | pthread_t tid; | |
1608 | pid_t system_tid; | |
1609 | sem_t *started; | |
1610 | pthread_cond_t *cond; | |
1611 | pthread_mutex_t *mutex; | |
1612 | int diverge; | |
1613 | int num_waits; | |
1614 | struct sock_fprog *prog; | |
1615 | struct __test_metadata *metadata; | |
1616 | }; | |
1617 | ||
1618 | FIXTURE_DATA(TSYNC) { | |
1619 | struct sock_fprog root_prog, apply_prog; | |
1620 | struct tsync_sibling sibling[TSYNC_SIBLINGS]; | |
1621 | sem_t started; | |
1622 | pthread_cond_t cond; | |
1623 | pthread_mutex_t mutex; | |
1624 | int sibling_count; | |
1625 | }; | |
1626 | ||
1627 | FIXTURE_SETUP(TSYNC) | |
1628 | { | |
1629 | struct sock_filter root_filter[] = { | |
1630 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1631 | }; | |
1632 | struct sock_filter apply_filter[] = { | |
1633 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1634 | offsetof(struct seccomp_data, nr)), | |
1635 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
1636 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1637 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1638 | }; | |
1639 | ||
1640 | memset(&self->root_prog, 0, sizeof(self->root_prog)); | |
1641 | memset(&self->apply_prog, 0, sizeof(self->apply_prog)); | |
1642 | memset(&self->sibling, 0, sizeof(self->sibling)); | |
1643 | self->root_prog.filter = malloc(sizeof(root_filter)); | |
1644 | ASSERT_NE(NULL, self->root_prog.filter); | |
1645 | memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter)); | |
1646 | self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter); | |
1647 | ||
1648 | self->apply_prog.filter = malloc(sizeof(apply_filter)); | |
1649 | ASSERT_NE(NULL, self->apply_prog.filter); | |
1650 | memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter)); | |
1651 | self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter); | |
1652 | ||
1653 | self->sibling_count = 0; | |
1654 | pthread_mutex_init(&self->mutex, NULL); | |
1655 | pthread_cond_init(&self->cond, NULL); | |
1656 | sem_init(&self->started, 0, 0); | |
1657 | self->sibling[0].tid = 0; | |
1658 | self->sibling[0].cond = &self->cond; | |
1659 | self->sibling[0].started = &self->started; | |
1660 | self->sibling[0].mutex = &self->mutex; | |
1661 | self->sibling[0].diverge = 0; | |
1662 | self->sibling[0].num_waits = 1; | |
1663 | self->sibling[0].prog = &self->root_prog; | |
1664 | self->sibling[0].metadata = _metadata; | |
1665 | self->sibling[1].tid = 0; | |
1666 | self->sibling[1].cond = &self->cond; | |
1667 | self->sibling[1].started = &self->started; | |
1668 | self->sibling[1].mutex = &self->mutex; | |
1669 | self->sibling[1].diverge = 0; | |
1670 | self->sibling[1].prog = &self->root_prog; | |
1671 | self->sibling[1].num_waits = 1; | |
1672 | self->sibling[1].metadata = _metadata; | |
1673 | } | |
1674 | ||
1675 | FIXTURE_TEARDOWN(TSYNC) | |
1676 | { | |
1677 | int sib = 0; | |
1678 | ||
1679 | if (self->root_prog.filter) | |
1680 | free(self->root_prog.filter); | |
1681 | if (self->apply_prog.filter) | |
1682 | free(self->apply_prog.filter); | |
1683 | ||
1684 | for ( ; sib < self->sibling_count; ++sib) { | |
1685 | struct tsync_sibling *s = &self->sibling[sib]; | |
1686 | void *status; | |
1687 | ||
1688 | if (!s->tid) | |
1689 | continue; | |
1690 | if (pthread_kill(s->tid, 0)) { | |
1691 | pthread_cancel(s->tid); | |
1692 | pthread_join(s->tid, &status); | |
1693 | } | |
1694 | } | |
1695 | pthread_mutex_destroy(&self->mutex); | |
1696 | pthread_cond_destroy(&self->cond); | |
1697 | sem_destroy(&self->started); | |
1698 | } | |
1699 | ||
1700 | void *tsync_sibling(void *data) | |
1701 | { | |
1702 | long ret = 0; | |
1703 | struct tsync_sibling *me = data; | |
1704 | ||
1705 | me->system_tid = syscall(__NR_gettid); | |
1706 | ||
1707 | pthread_mutex_lock(me->mutex); | |
1708 | if (me->diverge) { | |
1709 | /* Just re-apply the root prog to fork the tree */ | |
1710 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
1711 | me->prog, 0, 0); | |
1712 | } | |
1713 | sem_post(me->started); | |
1714 | /* Return outside of started so parent notices failures. */ | |
1715 | if (ret) { | |
1716 | pthread_mutex_unlock(me->mutex); | |
1717 | return (void *)SIBLING_EXIT_FAILURE; | |
1718 | } | |
1719 | do { | |
1720 | pthread_cond_wait(me->cond, me->mutex); | |
1721 | me->num_waits = me->num_waits - 1; | |
1722 | } while (me->num_waits); | |
1723 | pthread_mutex_unlock(me->mutex); | |
1724 | ||
1725 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0); | |
1726 | if (!ret) | |
1727 | return (void *)SIBLING_EXIT_NEWPRIVS; | |
1728 | read(0, NULL, 0); | |
1729 | return (void *)SIBLING_EXIT_UNKILLED; | |
1730 | } | |
1731 | ||
1732 | void tsync_start_sibling(struct tsync_sibling *sibling) | |
1733 | { | |
1734 | pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling); | |
1735 | } | |
1736 | ||
1737 | TEST_F(TSYNC, siblings_fail_prctl) | |
1738 | { | |
1739 | long ret; | |
1740 | void *status; | |
1741 | struct sock_filter filter[] = { | |
1742 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1743 | offsetof(struct seccomp_data, nr)), | |
1744 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
1745 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL), | |
1746 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1747 | }; | |
1748 | struct sock_fprog prog = { | |
1749 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1750 | .filter = filter, | |
1751 | }; | |
1752 | ||
1753 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
1754 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1755 | } | |
1756 | ||
1757 | /* Check prctl failure detection by requesting sib 0 diverge. */ | |
1758 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
1759 | ASSERT_NE(ENOSYS, errno) { |
1760 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1761 | } | |
c99ee51a KC |
1762 | ASSERT_EQ(0, ret) { |
1763 | TH_LOG("setting filter failed"); | |
1764 | } | |
1765 | ||
1766 | self->sibling[0].diverge = 1; | |
1767 | tsync_start_sibling(&self->sibling[0]); | |
1768 | tsync_start_sibling(&self->sibling[1]); | |
1769 | ||
1770 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
1771 | sem_wait(&self->started); | |
1772 | self->sibling_count++; | |
1773 | } | |
1774 | ||
1775 | /* Signal the threads to clean up*/ | |
1776 | pthread_mutex_lock(&self->mutex); | |
1777 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
1778 | TH_LOG("cond broadcast non-zero"); | |
1779 | } | |
1780 | pthread_mutex_unlock(&self->mutex); | |
1781 | ||
1782 | /* Ensure diverging sibling failed to call prctl. */ | |
1783 | pthread_join(self->sibling[0].tid, &status); | |
1784 | EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status); | |
1785 | pthread_join(self->sibling[1].tid, &status); | |
1786 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); | |
1787 | } | |
1788 | ||
1789 | TEST_F(TSYNC, two_siblings_with_ancestor) | |
1790 | { | |
1791 | long ret; | |
1792 | void *status; | |
1793 | ||
1794 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
1795 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1796 | } | |
1797 | ||
1798 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
1799 | ASSERT_NE(ENOSYS, errno) { |
1800 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1801 | } | |
c99ee51a KC |
1802 | ASSERT_EQ(0, ret) { |
1803 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
1804 | } | |
1805 | tsync_start_sibling(&self->sibling[0]); | |
1806 | tsync_start_sibling(&self->sibling[1]); | |
1807 | ||
1808 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
1809 | sem_wait(&self->started); | |
1810 | self->sibling_count++; | |
1811 | } | |
1812 | ||
1813 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
1814 | &self->apply_prog); | |
1815 | ASSERT_EQ(0, ret) { | |
1816 | TH_LOG("Could install filter on all threads!"); | |
1817 | } | |
1818 | /* Tell the siblings to test the policy */ | |
1819 | pthread_mutex_lock(&self->mutex); | |
1820 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
1821 | TH_LOG("cond broadcast non-zero"); | |
1822 | } | |
1823 | pthread_mutex_unlock(&self->mutex); | |
1824 | /* Ensure they are both killed and don't exit cleanly. */ | |
1825 | pthread_join(self->sibling[0].tid, &status); | |
1826 | EXPECT_EQ(0x0, (long)status); | |
1827 | pthread_join(self->sibling[1].tid, &status); | |
1828 | EXPECT_EQ(0x0, (long)status); | |
1829 | } | |
1830 | ||
1831 | TEST_F(TSYNC, two_sibling_want_nnp) | |
1832 | { | |
1833 | void *status; | |
1834 | ||
1835 | /* start siblings before any prctl() operations */ | |
1836 | tsync_start_sibling(&self->sibling[0]); | |
1837 | tsync_start_sibling(&self->sibling[1]); | |
1838 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
1839 | sem_wait(&self->started); | |
1840 | self->sibling_count++; | |
1841 | } | |
1842 | ||
1843 | /* Tell the siblings to test no policy */ | |
1844 | pthread_mutex_lock(&self->mutex); | |
1845 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
1846 | TH_LOG("cond broadcast non-zero"); | |
1847 | } | |
1848 | pthread_mutex_unlock(&self->mutex); | |
1849 | ||
1850 | /* Ensure they are both upset about lacking nnp. */ | |
1851 | pthread_join(self->sibling[0].tid, &status); | |
1852 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); | |
1853 | pthread_join(self->sibling[1].tid, &status); | |
1854 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); | |
1855 | } | |
1856 | ||
1857 | TEST_F(TSYNC, two_siblings_with_no_filter) | |
1858 | { | |
1859 | long ret; | |
1860 | void *status; | |
1861 | ||
1862 | /* start siblings before any prctl() operations */ | |
1863 | tsync_start_sibling(&self->sibling[0]); | |
1864 | tsync_start_sibling(&self->sibling[1]); | |
1865 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
1866 | sem_wait(&self->started); | |
1867 | self->sibling_count++; | |
1868 | } | |
1869 | ||
1870 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
1871 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1872 | } | |
1873 | ||
1874 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
1875 | &self->apply_prog); | |
b623c4da KC |
1876 | ASSERT_NE(ENOSYS, errno) { |
1877 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1878 | } | |
c99ee51a KC |
1879 | ASSERT_EQ(0, ret) { |
1880 | TH_LOG("Could install filter on all threads!"); | |
1881 | } | |
1882 | ||
1883 | /* Tell the siblings to test the policy */ | |
1884 | pthread_mutex_lock(&self->mutex); | |
1885 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
1886 | TH_LOG("cond broadcast non-zero"); | |
1887 | } | |
1888 | pthread_mutex_unlock(&self->mutex); | |
1889 | ||
1890 | /* Ensure they are both killed and don't exit cleanly. */ | |
1891 | pthread_join(self->sibling[0].tid, &status); | |
1892 | EXPECT_EQ(0x0, (long)status); | |
1893 | pthread_join(self->sibling[1].tid, &status); | |
1894 | EXPECT_EQ(0x0, (long)status); | |
1895 | } | |
1896 | ||
1897 | TEST_F(TSYNC, two_siblings_with_one_divergence) | |
1898 | { | |
1899 | long ret; | |
1900 | void *status; | |
1901 | ||
1902 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
1903 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1904 | } | |
1905 | ||
1906 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
1907 | ASSERT_NE(ENOSYS, errno) { |
1908 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1909 | } | |
c99ee51a KC |
1910 | ASSERT_EQ(0, ret) { |
1911 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
1912 | } | |
1913 | self->sibling[0].diverge = 1; | |
1914 | tsync_start_sibling(&self->sibling[0]); | |
1915 | tsync_start_sibling(&self->sibling[1]); | |
1916 | ||
1917 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
1918 | sem_wait(&self->started); | |
1919 | self->sibling_count++; | |
1920 | } | |
1921 | ||
1922 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
1923 | &self->apply_prog); | |
1924 | ASSERT_EQ(self->sibling[0].system_tid, ret) { | |
1925 | TH_LOG("Did not fail on diverged sibling."); | |
1926 | } | |
1927 | ||
1928 | /* Wake the threads */ | |
1929 | pthread_mutex_lock(&self->mutex); | |
1930 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
1931 | TH_LOG("cond broadcast non-zero"); | |
1932 | } | |
1933 | pthread_mutex_unlock(&self->mutex); | |
1934 | ||
1935 | /* Ensure they are both unkilled. */ | |
1936 | pthread_join(self->sibling[0].tid, &status); | |
1937 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); | |
1938 | pthread_join(self->sibling[1].tid, &status); | |
1939 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); | |
1940 | } | |
1941 | ||
1942 | TEST_F(TSYNC, two_siblings_not_under_filter) | |
1943 | { | |
1944 | long ret, sib; | |
1945 | void *status; | |
1946 | ||
1947 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
1948 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1949 | } | |
1950 | ||
1951 | /* | |
1952 | * Sibling 0 will have its own seccomp policy | |
1953 | * and Sibling 1 will not be under seccomp at | |
1954 | * all. Sibling 1 will enter seccomp and 0 | |
1955 | * will cause failure. | |
1956 | */ | |
1957 | self->sibling[0].diverge = 1; | |
1958 | tsync_start_sibling(&self->sibling[0]); | |
1959 | tsync_start_sibling(&self->sibling[1]); | |
1960 | ||
1961 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
1962 | sem_wait(&self->started); | |
1963 | self->sibling_count++; | |
1964 | } | |
1965 | ||
1966 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
1967 | ASSERT_NE(ENOSYS, errno) { |
1968 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1969 | } | |
c99ee51a KC |
1970 | ASSERT_EQ(0, ret) { |
1971 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
1972 | } | |
1973 | ||
1974 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
1975 | &self->apply_prog); | |
1976 | ASSERT_EQ(ret, self->sibling[0].system_tid) { | |
1977 | TH_LOG("Did not fail on diverged sibling."); | |
1978 | } | |
1979 | sib = 1; | |
1980 | if (ret == self->sibling[0].system_tid) | |
1981 | sib = 0; | |
1982 | ||
1983 | pthread_mutex_lock(&self->mutex); | |
1984 | ||
1985 | /* Increment the other siblings num_waits so we can clean up | |
1986 | * the one we just saw. | |
1987 | */ | |
1988 | self->sibling[!sib].num_waits += 1; | |
1989 | ||
1990 | /* Signal the thread to clean up*/ | |
1991 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
1992 | TH_LOG("cond broadcast non-zero"); | |
1993 | } | |
1994 | pthread_mutex_unlock(&self->mutex); | |
1995 | pthread_join(self->sibling[sib].tid, &status); | |
1996 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); | |
1997 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
1998 | while (!kill(self->sibling[sib].system_tid, 0)) | |
1999 | sleep(0.1); | |
2000 | /* Switch to the remaining sibling */ | |
2001 | sib = !sib; | |
2002 | ||
2003 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
2004 | &self->apply_prog); | |
2005 | ASSERT_EQ(0, ret) { | |
2006 | TH_LOG("Expected the remaining sibling to sync"); | |
2007 | }; | |
2008 | ||
2009 | pthread_mutex_lock(&self->mutex); | |
2010 | ||
2011 | /* If remaining sibling didn't have a chance to wake up during | |
2012 | * the first broadcast, manually reduce the num_waits now. | |
2013 | */ | |
2014 | if (self->sibling[sib].num_waits > 1) | |
2015 | self->sibling[sib].num_waits = 1; | |
2016 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2017 | TH_LOG("cond broadcast non-zero"); | |
2018 | } | |
2019 | pthread_mutex_unlock(&self->mutex); | |
2020 | pthread_join(self->sibling[sib].tid, &status); | |
2021 | EXPECT_EQ(0, (long)status); | |
2022 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2023 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2024 | sleep(0.1); | |
2025 | ||
2026 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC, | |
2027 | &self->apply_prog); | |
2028 | ASSERT_EQ(0, ret); /* just us chickens */ | |
2029 | } | |
2030 | ||
2031 | /* Make sure restarted syscalls are seen directly as "restart_syscall". */ | |
2032 | TEST(syscall_restart) | |
2033 | { | |
2034 | long ret; | |
2035 | unsigned long msg; | |
2036 | pid_t child_pid; | |
2037 | int pipefd[2]; | |
2038 | int status; | |
2039 | siginfo_t info = { }; | |
2040 | struct sock_filter filter[] = { | |
2041 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2042 | offsetof(struct seccomp_data, nr)), | |
2043 | ||
2044 | #ifdef __NR_sigreturn | |
2045 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0), | |
2046 | #endif | |
2047 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0), | |
2048 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0), | |
2049 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0), | |
256d0afb | 2050 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0), |
c99ee51a KC |
2051 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0), |
2052 | ||
2053 | /* Allow __NR_write for easy logging. */ | |
2054 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1), | |
2055 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2056 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
256d0afb KC |
2057 | /* The nanosleep jump target. */ |
2058 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100), | |
2059 | /* The restart_syscall jump target. */ | |
2060 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200), | |
c99ee51a KC |
2061 | }; |
2062 | struct sock_fprog prog = { | |
2063 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2064 | .filter = filter, | |
2065 | }; | |
256d0afb KC |
2066 | #if defined(__arm__) |
2067 | struct utsname utsbuf; | |
2068 | #endif | |
c99ee51a KC |
2069 | |
2070 | ASSERT_EQ(0, pipe(pipefd)); | |
2071 | ||
2072 | child_pid = fork(); | |
2073 | ASSERT_LE(0, child_pid); | |
2074 | if (child_pid == 0) { | |
2075 | /* Child uses EXPECT not ASSERT to deliver status correctly. */ | |
2076 | char buf = ' '; | |
256d0afb | 2077 | struct timespec timeout = { }; |
c99ee51a KC |
2078 | |
2079 | /* Attach parent as tracer and stop. */ | |
2080 | EXPECT_EQ(0, ptrace(PTRACE_TRACEME)); | |
2081 | EXPECT_EQ(0, raise(SIGSTOP)); | |
2082 | ||
2083 | EXPECT_EQ(0, close(pipefd[1])); | |
2084 | ||
2085 | EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2086 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2087 | } | |
2088 | ||
2089 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
2090 | EXPECT_EQ(0, ret) { | |
2091 | TH_LOG("Failed to install filter!"); | |
2092 | } | |
2093 | ||
2094 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2095 | TH_LOG("Failed to read() sync from parent"); | |
2096 | } | |
2097 | EXPECT_EQ('.', buf) { | |
2098 | TH_LOG("Failed to get sync data from read()"); | |
2099 | } | |
2100 | ||
256d0afb KC |
2101 | /* Start nanosleep to be interrupted. */ |
2102 | timeout.tv_sec = 1; | |
c99ee51a | 2103 | errno = 0; |
256d0afb KC |
2104 | EXPECT_EQ(0, nanosleep(&timeout, NULL)) { |
2105 | TH_LOG("Call to nanosleep() failed (errno %d)", errno); | |
c99ee51a KC |
2106 | } |
2107 | ||
2108 | /* Read final sync from parent. */ | |
2109 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2110 | TH_LOG("Failed final read() from parent"); | |
2111 | } | |
2112 | EXPECT_EQ('!', buf) { | |
2113 | TH_LOG("Failed to get final data from read()"); | |
2114 | } | |
2115 | ||
2116 | /* Directly report the status of our test harness results. */ | |
2117 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS | |
2118 | : EXIT_FAILURE); | |
2119 | } | |
2120 | EXPECT_EQ(0, close(pipefd[0])); | |
2121 | ||
2122 | /* Attach to child, setup options, and release. */ | |
2123 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2124 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2125 | ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL, | |
2126 | PTRACE_O_TRACESECCOMP)); | |
2127 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2128 | ASSERT_EQ(1, write(pipefd[1], ".", 1)); | |
2129 | ||
256d0afb | 2130 | /* Wait for nanosleep() to start. */ |
c99ee51a KC |
2131 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); |
2132 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2133 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2134 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2135 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
2136 | ASSERT_EQ(0x100, msg); | |
256d0afb | 2137 | EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid)); |
c99ee51a KC |
2138 | |
2139 | /* Might as well check siginfo for sanity while we're here. */ | |
2140 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2141 | ASSERT_EQ(SIGTRAP, info.si_signo); | |
2142 | ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code); | |
2143 | EXPECT_EQ(0, info.si_errno); | |
2144 | EXPECT_EQ(getuid(), info.si_uid); | |
2145 | /* Verify signal delivery came from child (seccomp-triggered). */ | |
2146 | EXPECT_EQ(child_pid, info.si_pid); | |
2147 | ||
256d0afb | 2148 | /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */ |
c99ee51a KC |
2149 | ASSERT_EQ(0, kill(child_pid, SIGSTOP)); |
2150 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2151 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2152 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2153 | ASSERT_EQ(SIGSTOP, WSTOPSIG(status)); | |
2154 | /* Verify signal delivery came from parent now. */ | |
2155 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2156 | EXPECT_EQ(getpid(), info.si_pid); | |
2157 | ||
256d0afb | 2158 | /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */ |
c99ee51a KC |
2159 | ASSERT_EQ(0, kill(child_pid, SIGCONT)); |
2160 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2161 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2162 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2163 | ASSERT_EQ(SIGCONT, WSTOPSIG(status)); | |
2164 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2165 | ||
2166 | /* Wait for restart_syscall() to start. */ | |
2167 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2168 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2169 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2170 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2171 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
256d0afb | 2172 | |
c99ee51a KC |
2173 | ASSERT_EQ(0x200, msg); |
2174 | ret = get_syscall(_metadata, child_pid); | |
2175 | #if defined(__arm__) | |
256d0afb KC |
2176 | /* |
2177 | * FIXME: | |
2178 | * - native ARM registers do NOT expose true syscall. | |
2179 | * - compat ARM registers on ARM64 DO expose true syscall. | |
2180 | */ | |
2181 | ASSERT_EQ(0, uname(&utsbuf)); | |
2182 | if (strncmp(utsbuf.machine, "arm", 3) == 0) { | |
2183 | EXPECT_EQ(__NR_nanosleep, ret); | |
2184 | } else | |
c99ee51a | 2185 | #endif |
256d0afb KC |
2186 | { |
2187 | EXPECT_EQ(__NR_restart_syscall, ret); | |
2188 | } | |
c99ee51a | 2189 | |
256d0afb | 2190 | /* Write again to end test. */ |
c99ee51a KC |
2191 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); |
2192 | ASSERT_EQ(1, write(pipefd[1], "!", 1)); | |
2193 | EXPECT_EQ(0, close(pipefd[1])); | |
2194 | ||
2195 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2196 | if (WIFSIGNALED(status) || WEXITSTATUS(status)) | |
2197 | _metadata->passed = 0; | |
2198 | } | |
2199 | ||
2200 | /* | |
2201 | * TODO: | |
2202 | * - add microbenchmarks | |
2203 | * - expand NNP testing | |
2204 | * - better arch-specific TRACE and TRAP handlers. | |
2205 | * - endianness checking when appropriate | |
2206 | * - 64-bit arg prodding | |
2207 | * - arch value testing (x86 modes especially) | |
2208 | * - ... | |
2209 | */ | |
2210 | ||
2211 | TEST_HARNESS_MAIN |