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Merge tag 'spi-fix-v5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
[mirror_ubuntu-jammy-kernel.git] / tools / testing / selftests / seccomp / seccomp_bpf.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
4 *
5 * Test code for seccomp bpf.
6 */
7
8 #define _GNU_SOURCE
9 #include <sys/types.h>
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
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>
31 #include <pthread.h>
32 #include <semaphore.h>
33 #include <signal.h>
34 #include <stddef.h>
35 #include <stdbool.h>
36 #include <string.h>
37 #include <time.h>
38 #include <limits.h>
39 #include <linux/elf.h>
40 #include <sys/uio.h>
41 #include <sys/utsname.h>
42 #include <sys/fcntl.h>
43 #include <sys/mman.h>
44 #include <sys/times.h>
45 #include <sys/socket.h>
46 #include <sys/ioctl.h>
47 #include <linux/kcmp.h>
48 #include <sys/resource.h>
49
50 #include <unistd.h>
51 #include <sys/syscall.h>
52 #include <poll.h>
53
54 #include "../kselftest_harness.h"
55 #include "../clone3/clone3_selftests.h"
56
57 /* Attempt to de-conflict with the selftests tree. */
58 #ifndef SKIP
59 #define SKIP(s, ...) XFAIL(s, ##__VA_ARGS__)
60 #endif
61
62 #ifndef PR_SET_PTRACER
63 # define PR_SET_PTRACER 0x59616d61
64 #endif
65
66 #ifndef PR_SET_NO_NEW_PRIVS
67 #define PR_SET_NO_NEW_PRIVS 38
68 #define PR_GET_NO_NEW_PRIVS 39
69 #endif
70
71 #ifndef PR_SECCOMP_EXT
72 #define PR_SECCOMP_EXT 43
73 #endif
74
75 #ifndef SECCOMP_EXT_ACT
76 #define SECCOMP_EXT_ACT 1
77 #endif
78
79 #ifndef SECCOMP_EXT_ACT_TSYNC
80 #define SECCOMP_EXT_ACT_TSYNC 1
81 #endif
82
83 #ifndef SECCOMP_MODE_STRICT
84 #define SECCOMP_MODE_STRICT 1
85 #endif
86
87 #ifndef SECCOMP_MODE_FILTER
88 #define SECCOMP_MODE_FILTER 2
89 #endif
90
91 #ifndef SECCOMP_RET_ALLOW
92 struct seccomp_data {
93 int nr;
94 __u32 arch;
95 __u64 instruction_pointer;
96 __u64 args[6];
97 };
98 #endif
99
100 #ifndef SECCOMP_RET_KILL_PROCESS
101 #define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */
102 #define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */
103 #endif
104 #ifndef SECCOMP_RET_KILL
105 #define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
106 #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
107 #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
108 #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
109 #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
110 #endif
111 #ifndef SECCOMP_RET_LOG
112 #define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */
113 #endif
114
115 #ifndef __NR_seccomp
116 # if defined(__i386__)
117 # define __NR_seccomp 354
118 # elif defined(__x86_64__)
119 # define __NR_seccomp 317
120 # elif defined(__arm__)
121 # define __NR_seccomp 383
122 # elif defined(__aarch64__)
123 # define __NR_seccomp 277
124 # elif defined(__riscv)
125 # define __NR_seccomp 277
126 # elif defined(__csky__)
127 # define __NR_seccomp 277
128 # elif defined(__hppa__)
129 # define __NR_seccomp 338
130 # elif defined(__powerpc__)
131 # define __NR_seccomp 358
132 # elif defined(__s390__)
133 # define __NR_seccomp 348
134 # elif defined(__xtensa__)
135 # define __NR_seccomp 337
136 # elif defined(__sh__)
137 # define __NR_seccomp 372
138 # else
139 # warning "seccomp syscall number unknown for this architecture"
140 # define __NR_seccomp 0xffff
141 # endif
142 #endif
143
144 #ifndef SECCOMP_SET_MODE_STRICT
145 #define SECCOMP_SET_MODE_STRICT 0
146 #endif
147
148 #ifndef SECCOMP_SET_MODE_FILTER
149 #define SECCOMP_SET_MODE_FILTER 1
150 #endif
151
152 #ifndef SECCOMP_GET_ACTION_AVAIL
153 #define SECCOMP_GET_ACTION_AVAIL 2
154 #endif
155
156 #ifndef SECCOMP_GET_NOTIF_SIZES
157 #define SECCOMP_GET_NOTIF_SIZES 3
158 #endif
159
160 #ifndef SECCOMP_FILTER_FLAG_TSYNC
161 #define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0)
162 #endif
163
164 #ifndef SECCOMP_FILTER_FLAG_LOG
165 #define SECCOMP_FILTER_FLAG_LOG (1UL << 1)
166 #endif
167
168 #ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW
169 #define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2)
170 #endif
171
172 #ifndef PTRACE_SECCOMP_GET_METADATA
173 #define PTRACE_SECCOMP_GET_METADATA 0x420d
174
175 struct seccomp_metadata {
176 __u64 filter_off; /* Input: which filter */
177 __u64 flags; /* Output: filter's flags */
178 };
179 #endif
180
181 #ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER
182 #define SECCOMP_FILTER_FLAG_NEW_LISTENER (1UL << 3)
183 #endif
184
185 #ifndef SECCOMP_RET_USER_NOTIF
186 #define SECCOMP_RET_USER_NOTIF 0x7fc00000U
187
188 #define SECCOMP_IOC_MAGIC '!'
189 #define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr)
190 #define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type)
191 #define SECCOMP_IOW(nr, type) _IOW(SECCOMP_IOC_MAGIC, nr, type)
192 #define SECCOMP_IOWR(nr, type) _IOWR(SECCOMP_IOC_MAGIC, nr, type)
193
194 /* Flags for seccomp notification fd ioctl. */
195 #define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
196 #define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
197 struct seccomp_notif_resp)
198 #define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOW(2, __u64)
199
200 struct seccomp_notif {
201 __u64 id;
202 __u32 pid;
203 __u32 flags;
204 struct seccomp_data data;
205 };
206
207 struct seccomp_notif_resp {
208 __u64 id;
209 __s64 val;
210 __s32 error;
211 __u32 flags;
212 };
213
214 struct seccomp_notif_sizes {
215 __u16 seccomp_notif;
216 __u16 seccomp_notif_resp;
217 __u16 seccomp_data;
218 };
219 #endif
220
221 #ifndef SECCOMP_IOCTL_NOTIF_ADDFD
222 /* On success, the return value is the remote process's added fd number */
223 #define SECCOMP_IOCTL_NOTIF_ADDFD SECCOMP_IOW(3, \
224 struct seccomp_notif_addfd)
225
226 /* valid flags for seccomp_notif_addfd */
227 #define SECCOMP_ADDFD_FLAG_SETFD (1UL << 0) /* Specify remote fd */
228
229 struct seccomp_notif_addfd {
230 __u64 id;
231 __u32 flags;
232 __u32 srcfd;
233 __u32 newfd;
234 __u32 newfd_flags;
235 };
236 #endif
237
238 struct seccomp_notif_addfd_small {
239 __u64 id;
240 char weird[4];
241 };
242 #define SECCOMP_IOCTL_NOTIF_ADDFD_SMALL \
243 SECCOMP_IOW(3, struct seccomp_notif_addfd_small)
244
245 struct seccomp_notif_addfd_big {
246 union {
247 struct seccomp_notif_addfd addfd;
248 char buf[sizeof(struct seccomp_notif_addfd) + 8];
249 };
250 };
251 #define SECCOMP_IOCTL_NOTIF_ADDFD_BIG \
252 SECCOMP_IOWR(3, struct seccomp_notif_addfd_big)
253
254 #ifndef PTRACE_EVENTMSG_SYSCALL_ENTRY
255 #define PTRACE_EVENTMSG_SYSCALL_ENTRY 1
256 #define PTRACE_EVENTMSG_SYSCALL_EXIT 2
257 #endif
258
259 #ifndef SECCOMP_USER_NOTIF_FLAG_CONTINUE
260 #define SECCOMP_USER_NOTIF_FLAG_CONTINUE 0x00000001
261 #endif
262
263 #ifndef SECCOMP_FILTER_FLAG_TSYNC_ESRCH
264 #define SECCOMP_FILTER_FLAG_TSYNC_ESRCH (1UL << 4)
265 #endif
266
267 #ifndef seccomp
268 int seccomp(unsigned int op, unsigned int flags, void *args)
269 {
270 errno = 0;
271 return syscall(__NR_seccomp, op, flags, args);
272 }
273 #endif
274
275 #if __BYTE_ORDER == __LITTLE_ENDIAN
276 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
277 #elif __BYTE_ORDER == __BIG_ENDIAN
278 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
279 #else
280 #error "wut? Unknown __BYTE_ORDER?!"
281 #endif
282
283 #define SIBLING_EXIT_UNKILLED 0xbadbeef
284 #define SIBLING_EXIT_FAILURE 0xbadface
285 #define SIBLING_EXIT_NEWPRIVS 0xbadfeed
286
287 static int __filecmp(pid_t pid1, pid_t pid2, int fd1, int fd2)
288 {
289 #ifdef __NR_kcmp
290 errno = 0;
291 return syscall(__NR_kcmp, pid1, pid2, KCMP_FILE, fd1, fd2);
292 #else
293 errno = ENOSYS;
294 return -1;
295 #endif
296 }
297
298 /* Have TH_LOG report actual location filecmp() is used. */
299 #define filecmp(pid1, pid2, fd1, fd2) ({ \
300 int _ret; \
301 \
302 _ret = __filecmp(pid1, pid2, fd1, fd2); \
303 if (_ret != 0) { \
304 if (_ret < 0 && errno == ENOSYS) { \
305 TH_LOG("kcmp() syscall missing (test is less accurate)");\
306 _ret = 0; \
307 } \
308 } \
309 _ret; })
310
311 TEST(kcmp)
312 {
313 int ret;
314
315 ret = __filecmp(getpid(), getpid(), 1, 1);
316 EXPECT_EQ(ret, 0);
317 if (ret != 0 && errno == ENOSYS)
318 SKIP(return, "Kernel does not support kcmp() (missing CONFIG_CHECKPOINT_RESTORE?)");
319 }
320
321 TEST(mode_strict_support)
322 {
323 long ret;
324
325 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
326 ASSERT_EQ(0, ret) {
327 TH_LOG("Kernel does not support CONFIG_SECCOMP");
328 }
329 syscall(__NR_exit, 0);
330 }
331
332 TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
333 {
334 long ret;
335
336 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
337 ASSERT_EQ(0, ret) {
338 TH_LOG("Kernel does not support CONFIG_SECCOMP");
339 }
340 syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
341 NULL, NULL, NULL);
342 EXPECT_FALSE(true) {
343 TH_LOG("Unreachable!");
344 }
345 }
346
347 /* Note! This doesn't test no new privs behavior */
348 TEST(no_new_privs_support)
349 {
350 long ret;
351
352 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
353 EXPECT_EQ(0, ret) {
354 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
355 }
356 }
357
358 /* Tests kernel support by checking for a copy_from_user() fault on NULL. */
359 TEST(mode_filter_support)
360 {
361 long ret;
362
363 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
364 ASSERT_EQ(0, ret) {
365 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
366 }
367 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL);
368 EXPECT_EQ(-1, ret);
369 EXPECT_EQ(EFAULT, errno) {
370 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
371 }
372 }
373
374 TEST(mode_filter_without_nnp)
375 {
376 struct sock_filter filter[] = {
377 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
378 };
379 struct sock_fprog prog = {
380 .len = (unsigned short)ARRAY_SIZE(filter),
381 .filter = filter,
382 };
383 long ret;
384
385 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
386 ASSERT_LE(0, ret) {
387 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
388 }
389 errno = 0;
390 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
391 /* Succeeds with CAP_SYS_ADMIN, fails without */
392 /* TODO(wad) check caps not euid */
393 if (geteuid()) {
394 EXPECT_EQ(-1, ret);
395 EXPECT_EQ(EACCES, errno);
396 } else {
397 EXPECT_EQ(0, ret);
398 }
399 }
400
401 #define MAX_INSNS_PER_PATH 32768
402
403 TEST(filter_size_limits)
404 {
405 int i;
406 int count = BPF_MAXINSNS + 1;
407 struct sock_filter allow[] = {
408 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
409 };
410 struct sock_filter *filter;
411 struct sock_fprog prog = { };
412 long ret;
413
414 filter = calloc(count, sizeof(*filter));
415 ASSERT_NE(NULL, filter);
416
417 for (i = 0; i < count; i++)
418 filter[i] = allow[0];
419
420 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
421 ASSERT_EQ(0, ret);
422
423 prog.filter = filter;
424 prog.len = count;
425
426 /* Too many filter instructions in a single filter. */
427 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
428 ASSERT_NE(0, ret) {
429 TH_LOG("Installing %d insn filter was allowed", prog.len);
430 }
431
432 /* One less is okay, though. */
433 prog.len -= 1;
434 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
435 ASSERT_EQ(0, ret) {
436 TH_LOG("Installing %d insn filter wasn't allowed", prog.len);
437 }
438 }
439
440 TEST(filter_chain_limits)
441 {
442 int i;
443 int count = BPF_MAXINSNS;
444 struct sock_filter allow[] = {
445 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
446 };
447 struct sock_filter *filter;
448 struct sock_fprog prog = { };
449 long ret;
450
451 filter = calloc(count, sizeof(*filter));
452 ASSERT_NE(NULL, filter);
453
454 for (i = 0; i < count; i++)
455 filter[i] = allow[0];
456
457 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
458 ASSERT_EQ(0, ret);
459
460 prog.filter = filter;
461 prog.len = 1;
462
463 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
464 ASSERT_EQ(0, ret);
465
466 prog.len = count;
467
468 /* Too many total filter instructions. */
469 for (i = 0; i < MAX_INSNS_PER_PATH; i++) {
470 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
471 if (ret != 0)
472 break;
473 }
474 ASSERT_NE(0, ret) {
475 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
476 i, count, i * (count + 4));
477 }
478 }
479
480 TEST(mode_filter_cannot_move_to_strict)
481 {
482 struct sock_filter filter[] = {
483 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
484 };
485 struct sock_fprog prog = {
486 .len = (unsigned short)ARRAY_SIZE(filter),
487 .filter = filter,
488 };
489 long ret;
490
491 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
492 ASSERT_EQ(0, ret);
493
494 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
495 ASSERT_EQ(0, ret);
496
497 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0);
498 EXPECT_EQ(-1, ret);
499 EXPECT_EQ(EINVAL, errno);
500 }
501
502
503 TEST(mode_filter_get_seccomp)
504 {
505 struct sock_filter filter[] = {
506 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
507 };
508 struct sock_fprog prog = {
509 .len = (unsigned short)ARRAY_SIZE(filter),
510 .filter = filter,
511 };
512 long ret;
513
514 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
515 ASSERT_EQ(0, ret);
516
517 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
518 EXPECT_EQ(0, ret);
519
520 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
521 ASSERT_EQ(0, ret);
522
523 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
524 EXPECT_EQ(2, ret);
525 }
526
527
528 TEST(ALLOW_all)
529 {
530 struct sock_filter filter[] = {
531 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
532 };
533 struct sock_fprog prog = {
534 .len = (unsigned short)ARRAY_SIZE(filter),
535 .filter = filter,
536 };
537 long ret;
538
539 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
540 ASSERT_EQ(0, ret);
541
542 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
543 ASSERT_EQ(0, ret);
544 }
545
546 TEST(empty_prog)
547 {
548 struct sock_filter filter[] = {
549 };
550 struct sock_fprog prog = {
551 .len = (unsigned short)ARRAY_SIZE(filter),
552 .filter = filter,
553 };
554 long ret;
555
556 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
557 ASSERT_EQ(0, ret);
558
559 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
560 EXPECT_EQ(-1, ret);
561 EXPECT_EQ(EINVAL, errno);
562 }
563
564 TEST(log_all)
565 {
566 struct sock_filter filter[] = {
567 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
568 };
569 struct sock_fprog prog = {
570 .len = (unsigned short)ARRAY_SIZE(filter),
571 .filter = filter,
572 };
573 long ret;
574 pid_t parent = getppid();
575
576 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
577 ASSERT_EQ(0, ret);
578
579 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
580 ASSERT_EQ(0, ret);
581
582 /* getppid() should succeed and be logged (no check for logging) */
583 EXPECT_EQ(parent, syscall(__NR_getppid));
584 }
585
586 TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS)
587 {
588 struct sock_filter filter[] = {
589 BPF_STMT(BPF_RET|BPF_K, 0x10000000U),
590 };
591 struct sock_fprog prog = {
592 .len = (unsigned short)ARRAY_SIZE(filter),
593 .filter = filter,
594 };
595 long ret;
596
597 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
598 ASSERT_EQ(0, ret);
599
600 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
601 ASSERT_EQ(0, ret);
602 EXPECT_EQ(0, syscall(__NR_getpid)) {
603 TH_LOG("getpid() shouldn't ever return");
604 }
605 }
606
607 /* return code >= 0x80000000 is unused. */
608 TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS)
609 {
610 struct sock_filter filter[] = {
611 BPF_STMT(BPF_RET|BPF_K, 0x90000000U),
612 };
613 struct sock_fprog prog = {
614 .len = (unsigned short)ARRAY_SIZE(filter),
615 .filter = filter,
616 };
617 long ret;
618
619 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
620 ASSERT_EQ(0, ret);
621
622 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
623 ASSERT_EQ(0, ret);
624 EXPECT_EQ(0, syscall(__NR_getpid)) {
625 TH_LOG("getpid() shouldn't ever return");
626 }
627 }
628
629 TEST_SIGNAL(KILL_all, SIGSYS)
630 {
631 struct sock_filter filter[] = {
632 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
633 };
634 struct sock_fprog prog = {
635 .len = (unsigned short)ARRAY_SIZE(filter),
636 .filter = filter,
637 };
638 long ret;
639
640 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
641 ASSERT_EQ(0, ret);
642
643 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
644 ASSERT_EQ(0, ret);
645 }
646
647 TEST_SIGNAL(KILL_one, SIGSYS)
648 {
649 struct sock_filter filter[] = {
650 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
651 offsetof(struct seccomp_data, nr)),
652 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
653 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
654 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
655 };
656 struct sock_fprog prog = {
657 .len = (unsigned short)ARRAY_SIZE(filter),
658 .filter = filter,
659 };
660 long ret;
661 pid_t parent = getppid();
662
663 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
664 ASSERT_EQ(0, ret);
665
666 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
667 ASSERT_EQ(0, ret);
668
669 EXPECT_EQ(parent, syscall(__NR_getppid));
670 /* getpid() should never return. */
671 EXPECT_EQ(0, syscall(__NR_getpid));
672 }
673
674 TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
675 {
676 void *fatal_address;
677 struct sock_filter filter[] = {
678 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
679 offsetof(struct seccomp_data, nr)),
680 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
681 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
682 /* Only both with lower 32-bit for now. */
683 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
684 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
685 (unsigned long)&fatal_address, 0, 1),
686 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
687 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
688 };
689 struct sock_fprog prog = {
690 .len = (unsigned short)ARRAY_SIZE(filter),
691 .filter = filter,
692 };
693 long ret;
694 pid_t parent = getppid();
695 struct tms timebuf;
696 clock_t clock = times(&timebuf);
697
698 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
699 ASSERT_EQ(0, ret);
700
701 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
702 ASSERT_EQ(0, ret);
703
704 EXPECT_EQ(parent, syscall(__NR_getppid));
705 EXPECT_LE(clock, syscall(__NR_times, &timebuf));
706 /* times() should never return. */
707 EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
708 }
709
710 TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
711 {
712 #ifndef __NR_mmap2
713 int sysno = __NR_mmap;
714 #else
715 int sysno = __NR_mmap2;
716 #endif
717 struct sock_filter filter[] = {
718 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
719 offsetof(struct seccomp_data, nr)),
720 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
721 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
722 /* Only both with lower 32-bit for now. */
723 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
724 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
725 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
726 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
727 };
728 struct sock_fprog prog = {
729 .len = (unsigned short)ARRAY_SIZE(filter),
730 .filter = filter,
731 };
732 long ret;
733 pid_t parent = getppid();
734 int fd;
735 void *map1, *map2;
736 int page_size = sysconf(_SC_PAGESIZE);
737
738 ASSERT_LT(0, page_size);
739
740 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
741 ASSERT_EQ(0, ret);
742
743 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
744 ASSERT_EQ(0, ret);
745
746 fd = open("/dev/zero", O_RDONLY);
747 ASSERT_NE(-1, fd);
748
749 EXPECT_EQ(parent, syscall(__NR_getppid));
750 map1 = (void *)syscall(sysno,
751 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
752 EXPECT_NE(MAP_FAILED, map1);
753 /* mmap2() should never return. */
754 map2 = (void *)syscall(sysno,
755 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
756 EXPECT_EQ(MAP_FAILED, map2);
757
758 /* The test failed, so clean up the resources. */
759 munmap(map1, page_size);
760 munmap(map2, page_size);
761 close(fd);
762 }
763
764 /* This is a thread task to die via seccomp filter violation. */
765 void *kill_thread(void *data)
766 {
767 bool die = (bool)data;
768
769 if (die) {
770 prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
771 return (void *)SIBLING_EXIT_FAILURE;
772 }
773
774 return (void *)SIBLING_EXIT_UNKILLED;
775 }
776
777 /* Prepare a thread that will kill itself or both of us. */
778 void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process)
779 {
780 pthread_t thread;
781 void *status;
782 /* Kill only when calling __NR_prctl. */
783 struct sock_filter filter_thread[] = {
784 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
785 offsetof(struct seccomp_data, nr)),
786 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
787 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD),
788 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
789 };
790 struct sock_fprog prog_thread = {
791 .len = (unsigned short)ARRAY_SIZE(filter_thread),
792 .filter = filter_thread,
793 };
794 struct sock_filter filter_process[] = {
795 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
796 offsetof(struct seccomp_data, nr)),
797 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
798 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS),
799 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
800 };
801 struct sock_fprog prog_process = {
802 .len = (unsigned short)ARRAY_SIZE(filter_process),
803 .filter = filter_process,
804 };
805
806 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
807 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
808 }
809
810 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0,
811 kill_process ? &prog_process : &prog_thread));
812
813 /*
814 * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS
815 * flag cannot be downgraded by a new filter.
816 */
817 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread));
818
819 /* Start a thread that will exit immediately. */
820 ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false));
821 ASSERT_EQ(0, pthread_join(thread, &status));
822 ASSERT_EQ(SIBLING_EXIT_UNKILLED, (unsigned long)status);
823
824 /* Start a thread that will die immediately. */
825 ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)true));
826 ASSERT_EQ(0, pthread_join(thread, &status));
827 ASSERT_NE(SIBLING_EXIT_FAILURE, (unsigned long)status);
828
829 /*
830 * If we get here, only the spawned thread died. Let the parent know
831 * the whole process didn't die (i.e. this thread, the spawner,
832 * stayed running).
833 */
834 exit(42);
835 }
836
837 TEST(KILL_thread)
838 {
839 int status;
840 pid_t child_pid;
841
842 child_pid = fork();
843 ASSERT_LE(0, child_pid);
844 if (child_pid == 0) {
845 kill_thread_or_group(_metadata, false);
846 _exit(38);
847 }
848
849 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
850
851 /* If only the thread was killed, we'll see exit 42. */
852 ASSERT_TRUE(WIFEXITED(status));
853 ASSERT_EQ(42, WEXITSTATUS(status));
854 }
855
856 TEST(KILL_process)
857 {
858 int status;
859 pid_t child_pid;
860
861 child_pid = fork();
862 ASSERT_LE(0, child_pid);
863 if (child_pid == 0) {
864 kill_thread_or_group(_metadata, true);
865 _exit(38);
866 }
867
868 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
869
870 /* If the entire process was killed, we'll see SIGSYS. */
871 ASSERT_TRUE(WIFSIGNALED(status));
872 ASSERT_EQ(SIGSYS, WTERMSIG(status));
873 }
874
875 /* TODO(wad) add 64-bit versus 32-bit arg tests. */
876 TEST(arg_out_of_range)
877 {
878 struct sock_filter filter[] = {
879 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
880 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
881 };
882 struct sock_fprog prog = {
883 .len = (unsigned short)ARRAY_SIZE(filter),
884 .filter = filter,
885 };
886 long ret;
887
888 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
889 ASSERT_EQ(0, ret);
890
891 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
892 EXPECT_EQ(-1, ret);
893 EXPECT_EQ(EINVAL, errno);
894 }
895
896 #define ERRNO_FILTER(name, errno) \
897 struct sock_filter _read_filter_##name[] = { \
898 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
899 offsetof(struct seccomp_data, nr)), \
900 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
901 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
902 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
903 }; \
904 struct sock_fprog prog_##name = { \
905 .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
906 .filter = _read_filter_##name, \
907 }
908
909 /* Make sure basic errno values are correctly passed through a filter. */
910 TEST(ERRNO_valid)
911 {
912 ERRNO_FILTER(valid, E2BIG);
913 long ret;
914 pid_t parent = getppid();
915
916 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
917 ASSERT_EQ(0, ret);
918
919 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid);
920 ASSERT_EQ(0, ret);
921
922 EXPECT_EQ(parent, syscall(__NR_getppid));
923 EXPECT_EQ(-1, read(0, NULL, 0));
924 EXPECT_EQ(E2BIG, errno);
925 }
926
927 /* Make sure an errno of zero is correctly handled by the arch code. */
928 TEST(ERRNO_zero)
929 {
930 ERRNO_FILTER(zero, 0);
931 long ret;
932 pid_t parent = getppid();
933
934 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
935 ASSERT_EQ(0, ret);
936
937 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero);
938 ASSERT_EQ(0, ret);
939
940 EXPECT_EQ(parent, syscall(__NR_getppid));
941 /* "errno" of 0 is ok. */
942 EXPECT_EQ(0, read(0, NULL, 0));
943 }
944
945 /*
946 * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller.
947 * This tests that the errno value gets capped correctly, fixed by
948 * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO").
949 */
950 TEST(ERRNO_capped)
951 {
952 ERRNO_FILTER(capped, 4096);
953 long ret;
954 pid_t parent = getppid();
955
956 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
957 ASSERT_EQ(0, ret);
958
959 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped);
960 ASSERT_EQ(0, ret);
961
962 EXPECT_EQ(parent, syscall(__NR_getppid));
963 EXPECT_EQ(-1, read(0, NULL, 0));
964 EXPECT_EQ(4095, errno);
965 }
966
967 /*
968 * Filters are processed in reverse order: last applied is executed first.
969 * Since only the SECCOMP_RET_ACTION mask is tested for return values, the
970 * SECCOMP_RET_DATA mask results will follow the most recently applied
971 * matching filter return (and not the lowest or highest value).
972 */
973 TEST(ERRNO_order)
974 {
975 ERRNO_FILTER(first, 11);
976 ERRNO_FILTER(second, 13);
977 ERRNO_FILTER(third, 12);
978 long ret;
979 pid_t parent = getppid();
980
981 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
982 ASSERT_EQ(0, ret);
983
984 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first);
985 ASSERT_EQ(0, ret);
986
987 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second);
988 ASSERT_EQ(0, ret);
989
990 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third);
991 ASSERT_EQ(0, ret);
992
993 EXPECT_EQ(parent, syscall(__NR_getppid));
994 EXPECT_EQ(-1, read(0, NULL, 0));
995 EXPECT_EQ(12, errno);
996 }
997
998 FIXTURE(TRAP) {
999 struct sock_fprog prog;
1000 };
1001
1002 FIXTURE_SETUP(TRAP)
1003 {
1004 struct sock_filter filter[] = {
1005 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1006 offsetof(struct seccomp_data, nr)),
1007 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1008 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
1009 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1010 };
1011
1012 memset(&self->prog, 0, sizeof(self->prog));
1013 self->prog.filter = malloc(sizeof(filter));
1014 ASSERT_NE(NULL, self->prog.filter);
1015 memcpy(self->prog.filter, filter, sizeof(filter));
1016 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1017 }
1018
1019 FIXTURE_TEARDOWN(TRAP)
1020 {
1021 if (self->prog.filter)
1022 free(self->prog.filter);
1023 }
1024
1025 TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
1026 {
1027 long ret;
1028
1029 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1030 ASSERT_EQ(0, ret);
1031
1032 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
1033 ASSERT_EQ(0, ret);
1034 syscall(__NR_getpid);
1035 }
1036
1037 /* Ensure that SIGSYS overrides SIG_IGN */
1038 TEST_F_SIGNAL(TRAP, ign, SIGSYS)
1039 {
1040 long ret;
1041
1042 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1043 ASSERT_EQ(0, ret);
1044
1045 signal(SIGSYS, SIG_IGN);
1046
1047 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
1048 ASSERT_EQ(0, ret);
1049 syscall(__NR_getpid);
1050 }
1051
1052 static siginfo_t TRAP_info;
1053 static volatile int TRAP_nr;
1054 static void TRAP_action(int nr, siginfo_t *info, void *void_context)
1055 {
1056 memcpy(&TRAP_info, info, sizeof(TRAP_info));
1057 TRAP_nr = nr;
1058 }
1059
1060 TEST_F(TRAP, handler)
1061 {
1062 int ret, test;
1063 struct sigaction act;
1064 sigset_t mask;
1065
1066 memset(&act, 0, sizeof(act));
1067 sigemptyset(&mask);
1068 sigaddset(&mask, SIGSYS);
1069
1070 act.sa_sigaction = &TRAP_action;
1071 act.sa_flags = SA_SIGINFO;
1072 ret = sigaction(SIGSYS, &act, NULL);
1073 ASSERT_EQ(0, ret) {
1074 TH_LOG("sigaction failed");
1075 }
1076 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
1077 ASSERT_EQ(0, ret) {
1078 TH_LOG("sigprocmask failed");
1079 }
1080
1081 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1082 ASSERT_EQ(0, ret);
1083 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
1084 ASSERT_EQ(0, ret);
1085 TRAP_nr = 0;
1086 memset(&TRAP_info, 0, sizeof(TRAP_info));
1087 /* Expect the registers to be rolled back. (nr = error) may vary
1088 * based on arch. */
1089 ret = syscall(__NR_getpid);
1090 /* Silence gcc warning about volatile. */
1091 test = TRAP_nr;
1092 EXPECT_EQ(SIGSYS, test);
1093 struct local_sigsys {
1094 void *_call_addr; /* calling user insn */
1095 int _syscall; /* triggering system call number */
1096 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
1097 } *sigsys = (struct local_sigsys *)
1098 #ifdef si_syscall
1099 &(TRAP_info.si_call_addr);
1100 #else
1101 &TRAP_info.si_pid;
1102 #endif
1103 EXPECT_EQ(__NR_getpid, sigsys->_syscall);
1104 /* Make sure arch is non-zero. */
1105 EXPECT_NE(0, sigsys->_arch);
1106 EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
1107 }
1108
1109 FIXTURE(precedence) {
1110 struct sock_fprog allow;
1111 struct sock_fprog log;
1112 struct sock_fprog trace;
1113 struct sock_fprog error;
1114 struct sock_fprog trap;
1115 struct sock_fprog kill;
1116 };
1117
1118 FIXTURE_SETUP(precedence)
1119 {
1120 struct sock_filter allow_insns[] = {
1121 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1122 };
1123 struct sock_filter log_insns[] = {
1124 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1125 offsetof(struct seccomp_data, nr)),
1126 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1127 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1128 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
1129 };
1130 struct sock_filter trace_insns[] = {
1131 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1132 offsetof(struct seccomp_data, nr)),
1133 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1134 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1135 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
1136 };
1137 struct sock_filter error_insns[] = {
1138 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1139 offsetof(struct seccomp_data, nr)),
1140 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1141 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1142 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
1143 };
1144 struct sock_filter trap_insns[] = {
1145 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1146 offsetof(struct seccomp_data, nr)),
1147 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1148 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1149 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
1150 };
1151 struct sock_filter kill_insns[] = {
1152 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1153 offsetof(struct seccomp_data, nr)),
1154 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1155 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1156 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1157 };
1158
1159 memset(self, 0, sizeof(*self));
1160 #define FILTER_ALLOC(_x) \
1161 self->_x.filter = malloc(sizeof(_x##_insns)); \
1162 ASSERT_NE(NULL, self->_x.filter); \
1163 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
1164 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
1165 FILTER_ALLOC(allow);
1166 FILTER_ALLOC(log);
1167 FILTER_ALLOC(trace);
1168 FILTER_ALLOC(error);
1169 FILTER_ALLOC(trap);
1170 FILTER_ALLOC(kill);
1171 }
1172
1173 FIXTURE_TEARDOWN(precedence)
1174 {
1175 #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
1176 FILTER_FREE(allow);
1177 FILTER_FREE(log);
1178 FILTER_FREE(trace);
1179 FILTER_FREE(error);
1180 FILTER_FREE(trap);
1181 FILTER_FREE(kill);
1182 }
1183
1184 TEST_F(precedence, allow_ok)
1185 {
1186 pid_t parent, res = 0;
1187 long ret;
1188
1189 parent = getppid();
1190 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1191 ASSERT_EQ(0, ret);
1192
1193 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1194 ASSERT_EQ(0, ret);
1195 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1196 ASSERT_EQ(0, ret);
1197 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1198 ASSERT_EQ(0, ret);
1199 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1200 ASSERT_EQ(0, ret);
1201 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1202 ASSERT_EQ(0, ret);
1203 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1204 ASSERT_EQ(0, ret);
1205 /* Should work just fine. */
1206 res = syscall(__NR_getppid);
1207 EXPECT_EQ(parent, res);
1208 }
1209
1210 TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
1211 {
1212 pid_t parent, res = 0;
1213 long ret;
1214
1215 parent = getppid();
1216 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1217 ASSERT_EQ(0, ret);
1218
1219 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1220 ASSERT_EQ(0, ret);
1221 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1222 ASSERT_EQ(0, ret);
1223 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1224 ASSERT_EQ(0, ret);
1225 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1226 ASSERT_EQ(0, ret);
1227 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1228 ASSERT_EQ(0, ret);
1229 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1230 ASSERT_EQ(0, ret);
1231 /* Should work just fine. */
1232 res = syscall(__NR_getppid);
1233 EXPECT_EQ(parent, res);
1234 /* getpid() should never return. */
1235 res = syscall(__NR_getpid);
1236 EXPECT_EQ(0, res);
1237 }
1238
1239 TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
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
1248 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1249 ASSERT_EQ(0, ret);
1250 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1251 ASSERT_EQ(0, ret);
1252 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1253 ASSERT_EQ(0, ret);
1254 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1255 ASSERT_EQ(0, ret);
1256 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1257 ASSERT_EQ(0, ret);
1258 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1259 ASSERT_EQ(0, ret);
1260 /* Should work just fine. */
1261 EXPECT_EQ(parent, syscall(__NR_getppid));
1262 /* getpid() should never return. */
1263 EXPECT_EQ(0, syscall(__NR_getpid));
1264 }
1265
1266 TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
1267 {
1268 pid_t parent;
1269 long ret;
1270
1271 parent = getppid();
1272 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1273 ASSERT_EQ(0, ret);
1274
1275 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1276 ASSERT_EQ(0, ret);
1277 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1278 ASSERT_EQ(0, ret);
1279 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1280 ASSERT_EQ(0, ret);
1281 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1282 ASSERT_EQ(0, ret);
1283 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1284 ASSERT_EQ(0, ret);
1285 /* Should work just fine. */
1286 EXPECT_EQ(parent, syscall(__NR_getppid));
1287 /* getpid() should never return. */
1288 EXPECT_EQ(0, syscall(__NR_getpid));
1289 }
1290
1291 TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
1292 {
1293 pid_t parent;
1294 long ret;
1295
1296 parent = getppid();
1297 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1298 ASSERT_EQ(0, ret);
1299
1300 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1301 ASSERT_EQ(0, ret);
1302 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1303 ASSERT_EQ(0, ret);
1304 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1305 ASSERT_EQ(0, ret);
1306 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1307 ASSERT_EQ(0, ret);
1308 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1309 ASSERT_EQ(0, ret);
1310 /* Should work just fine. */
1311 EXPECT_EQ(parent, syscall(__NR_getppid));
1312 /* getpid() should never return. */
1313 EXPECT_EQ(0, syscall(__NR_getpid));
1314 }
1315
1316 TEST_F(precedence, errno_is_third)
1317 {
1318 pid_t parent;
1319 long ret;
1320
1321 parent = getppid();
1322 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1323 ASSERT_EQ(0, ret);
1324
1325 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1326 ASSERT_EQ(0, ret);
1327 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1328 ASSERT_EQ(0, ret);
1329 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1330 ASSERT_EQ(0, ret);
1331 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1332 ASSERT_EQ(0, ret);
1333 /* Should work just fine. */
1334 EXPECT_EQ(parent, syscall(__NR_getppid));
1335 EXPECT_EQ(0, syscall(__NR_getpid));
1336 }
1337
1338 TEST_F(precedence, errno_is_third_in_any_order)
1339 {
1340 pid_t parent;
1341 long ret;
1342
1343 parent = getppid();
1344 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1345 ASSERT_EQ(0, ret);
1346
1347 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1348 ASSERT_EQ(0, ret);
1349 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1350 ASSERT_EQ(0, ret);
1351 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1352 ASSERT_EQ(0, ret);
1353 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1354 ASSERT_EQ(0, ret);
1355 /* Should work just fine. */
1356 EXPECT_EQ(parent, syscall(__NR_getppid));
1357 EXPECT_EQ(0, syscall(__NR_getpid));
1358 }
1359
1360 TEST_F(precedence, trace_is_fourth)
1361 {
1362 pid_t parent;
1363 long ret;
1364
1365 parent = getppid();
1366 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1367 ASSERT_EQ(0, ret);
1368
1369 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1370 ASSERT_EQ(0, ret);
1371 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1372 ASSERT_EQ(0, ret);
1373 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1374 ASSERT_EQ(0, ret);
1375 /* Should work just fine. */
1376 EXPECT_EQ(parent, syscall(__NR_getppid));
1377 /* No ptracer */
1378 EXPECT_EQ(-1, syscall(__NR_getpid));
1379 }
1380
1381 TEST_F(precedence, trace_is_fourth_in_any_order)
1382 {
1383 pid_t parent;
1384 long ret;
1385
1386 parent = getppid();
1387 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1388 ASSERT_EQ(0, ret);
1389
1390 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1391 ASSERT_EQ(0, ret);
1392 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1393 ASSERT_EQ(0, ret);
1394 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1395 ASSERT_EQ(0, ret);
1396 /* Should work just fine. */
1397 EXPECT_EQ(parent, syscall(__NR_getppid));
1398 /* No ptracer */
1399 EXPECT_EQ(-1, syscall(__NR_getpid));
1400 }
1401
1402 TEST_F(precedence, log_is_fifth)
1403 {
1404 pid_t mypid, parent;
1405 long ret;
1406
1407 mypid = getpid();
1408 parent = getppid();
1409 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1410 ASSERT_EQ(0, ret);
1411
1412 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1413 ASSERT_EQ(0, ret);
1414 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1415 ASSERT_EQ(0, ret);
1416 /* Should work just fine. */
1417 EXPECT_EQ(parent, syscall(__NR_getppid));
1418 /* Should also work just fine */
1419 EXPECT_EQ(mypid, syscall(__NR_getpid));
1420 }
1421
1422 TEST_F(precedence, log_is_fifth_in_any_order)
1423 {
1424 pid_t mypid, parent;
1425 long ret;
1426
1427 mypid = getpid();
1428 parent = getppid();
1429 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1430 ASSERT_EQ(0, ret);
1431
1432 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1433 ASSERT_EQ(0, ret);
1434 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1435 ASSERT_EQ(0, ret);
1436 /* Should work just fine. */
1437 EXPECT_EQ(parent, syscall(__NR_getppid));
1438 /* Should also work just fine */
1439 EXPECT_EQ(mypid, syscall(__NR_getpid));
1440 }
1441
1442 #ifndef PTRACE_O_TRACESECCOMP
1443 #define PTRACE_O_TRACESECCOMP 0x00000080
1444 #endif
1445
1446 /* Catch the Ubuntu 12.04 value error. */
1447 #if PTRACE_EVENT_SECCOMP != 7
1448 #undef PTRACE_EVENT_SECCOMP
1449 #endif
1450
1451 #ifndef PTRACE_EVENT_SECCOMP
1452 #define PTRACE_EVENT_SECCOMP 7
1453 #endif
1454
1455 #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1456 bool tracer_running;
1457 void tracer_stop(int sig)
1458 {
1459 tracer_running = false;
1460 }
1461
1462 typedef void tracer_func_t(struct __test_metadata *_metadata,
1463 pid_t tracee, int status, void *args);
1464
1465 void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
1466 tracer_func_t tracer_func, void *args, bool ptrace_syscall)
1467 {
1468 int ret = -1;
1469 struct sigaction action = {
1470 .sa_handler = tracer_stop,
1471 };
1472
1473 /* Allow external shutdown. */
1474 tracer_running = true;
1475 ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
1476
1477 errno = 0;
1478 while (ret == -1 && errno != EINVAL)
1479 ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
1480 ASSERT_EQ(0, ret) {
1481 kill(tracee, SIGKILL);
1482 }
1483 /* Wait for attach stop */
1484 wait(NULL);
1485
1486 ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?
1487 PTRACE_O_TRACESYSGOOD :
1488 PTRACE_O_TRACESECCOMP);
1489 ASSERT_EQ(0, ret) {
1490 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1491 kill(tracee, SIGKILL);
1492 }
1493 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1494 tracee, NULL, 0);
1495 ASSERT_EQ(0, ret);
1496
1497 /* Unblock the tracee */
1498 ASSERT_EQ(1, write(fd, "A", 1));
1499 ASSERT_EQ(0, close(fd));
1500
1501 /* Run until we're shut down. Must assert to stop execution. */
1502 while (tracer_running) {
1503 int status;
1504
1505 if (wait(&status) != tracee)
1506 continue;
1507 if (WIFSIGNALED(status) || WIFEXITED(status))
1508 /* Child is dead. Time to go. */
1509 return;
1510
1511 /* Check if this is a seccomp event. */
1512 ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status));
1513
1514 tracer_func(_metadata, tracee, status, args);
1515
1516 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1517 tracee, NULL, 0);
1518 ASSERT_EQ(0, ret);
1519 }
1520 /* Directly report the status of our test harness results. */
1521 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
1522 }
1523
1524 /* Common tracer setup/teardown functions. */
1525 void cont_handler(int num)
1526 { }
1527 pid_t setup_trace_fixture(struct __test_metadata *_metadata,
1528 tracer_func_t func, void *args, bool ptrace_syscall)
1529 {
1530 char sync;
1531 int pipefd[2];
1532 pid_t tracer_pid;
1533 pid_t tracee = getpid();
1534
1535 /* Setup a pipe for clean synchronization. */
1536 ASSERT_EQ(0, pipe(pipefd));
1537
1538 /* Fork a child which we'll promote to tracer */
1539 tracer_pid = fork();
1540 ASSERT_LE(0, tracer_pid);
1541 signal(SIGALRM, cont_handler);
1542 if (tracer_pid == 0) {
1543 close(pipefd[0]);
1544 start_tracer(_metadata, pipefd[1], tracee, func, args,
1545 ptrace_syscall);
1546 syscall(__NR_exit, 0);
1547 }
1548 close(pipefd[1]);
1549 prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
1550 read(pipefd[0], &sync, 1);
1551 close(pipefd[0]);
1552
1553 return tracer_pid;
1554 }
1555
1556 void teardown_trace_fixture(struct __test_metadata *_metadata,
1557 pid_t tracer)
1558 {
1559 if (tracer) {
1560 int status;
1561 /*
1562 * Extract the exit code from the other process and
1563 * adopt it for ourselves in case its asserts failed.
1564 */
1565 ASSERT_EQ(0, kill(tracer, SIGUSR1));
1566 ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
1567 if (WEXITSTATUS(status))
1568 _metadata->passed = 0;
1569 }
1570 }
1571
1572 /* "poke" tracer arguments and function. */
1573 struct tracer_args_poke_t {
1574 unsigned long poke_addr;
1575 };
1576
1577 void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
1578 void *args)
1579 {
1580 int ret;
1581 unsigned long msg;
1582 struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
1583
1584 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1585 EXPECT_EQ(0, ret);
1586 /* If this fails, don't try to recover. */
1587 ASSERT_EQ(0x1001, msg) {
1588 kill(tracee, SIGKILL);
1589 }
1590 /*
1591 * Poke in the message.
1592 * Registers are not touched to try to keep this relatively arch
1593 * agnostic.
1594 */
1595 ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
1596 EXPECT_EQ(0, ret);
1597 }
1598
1599 FIXTURE(TRACE_poke) {
1600 struct sock_fprog prog;
1601 pid_t tracer;
1602 long poked;
1603 struct tracer_args_poke_t tracer_args;
1604 };
1605
1606 FIXTURE_SETUP(TRACE_poke)
1607 {
1608 struct sock_filter filter[] = {
1609 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1610 offsetof(struct seccomp_data, nr)),
1611 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1612 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
1613 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1614 };
1615
1616 self->poked = 0;
1617 memset(&self->prog, 0, sizeof(self->prog));
1618 self->prog.filter = malloc(sizeof(filter));
1619 ASSERT_NE(NULL, self->prog.filter);
1620 memcpy(self->prog.filter, filter, sizeof(filter));
1621 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1622
1623 /* Set up tracer args. */
1624 self->tracer_args.poke_addr = (unsigned long)&self->poked;
1625
1626 /* Launch tracer. */
1627 self->tracer = setup_trace_fixture(_metadata, tracer_poke,
1628 &self->tracer_args, false);
1629 }
1630
1631 FIXTURE_TEARDOWN(TRACE_poke)
1632 {
1633 teardown_trace_fixture(_metadata, self->tracer);
1634 if (self->prog.filter)
1635 free(self->prog.filter);
1636 }
1637
1638 TEST_F(TRACE_poke, read_has_side_effects)
1639 {
1640 ssize_t ret;
1641
1642 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1643 ASSERT_EQ(0, ret);
1644
1645 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1646 ASSERT_EQ(0, ret);
1647
1648 EXPECT_EQ(0, self->poked);
1649 ret = read(-1, NULL, 0);
1650 EXPECT_EQ(-1, ret);
1651 EXPECT_EQ(0x1001, self->poked);
1652 }
1653
1654 TEST_F(TRACE_poke, getpid_runs_normally)
1655 {
1656 long ret;
1657
1658 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1659 ASSERT_EQ(0, ret);
1660
1661 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1662 ASSERT_EQ(0, ret);
1663
1664 EXPECT_EQ(0, self->poked);
1665 EXPECT_NE(0, syscall(__NR_getpid));
1666 EXPECT_EQ(0, self->poked);
1667 }
1668
1669 #if defined(__x86_64__)
1670 # define ARCH_REGS struct user_regs_struct
1671 # define SYSCALL_NUM orig_rax
1672 # define SYSCALL_RET rax
1673 #elif defined(__i386__)
1674 # define ARCH_REGS struct user_regs_struct
1675 # define SYSCALL_NUM orig_eax
1676 # define SYSCALL_RET eax
1677 #elif defined(__arm__)
1678 # define ARCH_REGS struct pt_regs
1679 # define SYSCALL_NUM ARM_r7
1680 # define SYSCALL_RET ARM_r0
1681 #elif defined(__aarch64__)
1682 # define ARCH_REGS struct user_pt_regs
1683 # define SYSCALL_NUM regs[8]
1684 # define SYSCALL_RET regs[0]
1685 #elif defined(__riscv) && __riscv_xlen == 64
1686 # define ARCH_REGS struct user_regs_struct
1687 # define SYSCALL_NUM a7
1688 # define SYSCALL_RET a0
1689 #elif defined(__csky__)
1690 # define ARCH_REGS struct pt_regs
1691 #if defined(__CSKYABIV2__)
1692 # define SYSCALL_NUM regs[3]
1693 #else
1694 # define SYSCALL_NUM regs[9]
1695 #endif
1696 # define SYSCALL_RET a0
1697 #elif defined(__hppa__)
1698 # define ARCH_REGS struct user_regs_struct
1699 # define SYSCALL_NUM gr[20]
1700 # define SYSCALL_RET gr[28]
1701 #elif defined(__powerpc__)
1702 # define ARCH_REGS struct pt_regs
1703 # define SYSCALL_NUM gpr[0]
1704 # define SYSCALL_RET gpr[3]
1705 #elif defined(__s390__)
1706 # define ARCH_REGS s390_regs
1707 # define SYSCALL_NUM gprs[2]
1708 # define SYSCALL_RET gprs[2]
1709 # define SYSCALL_NUM_RET_SHARE_REG
1710 #elif defined(__mips__)
1711 # define ARCH_REGS struct pt_regs
1712 # define SYSCALL_NUM regs[2]
1713 # define SYSCALL_SYSCALL_NUM regs[4]
1714 # define SYSCALL_RET regs[2]
1715 # define SYSCALL_NUM_RET_SHARE_REG
1716 #elif defined(__xtensa__)
1717 # define ARCH_REGS struct user_pt_regs
1718 # define SYSCALL_NUM syscall
1719 /*
1720 * On xtensa syscall return value is in the register
1721 * a2 of the current window which is not fixed.
1722 */
1723 #define SYSCALL_RET(reg) a[(reg).windowbase * 4 + 2]
1724 #elif defined(__sh__)
1725 # define ARCH_REGS struct pt_regs
1726 # define SYSCALL_NUM gpr[3]
1727 # define SYSCALL_RET gpr[0]
1728 #else
1729 # error "Do not know how to find your architecture's registers and syscalls"
1730 #endif
1731
1732 /* When the syscall return can't be changed, stub out the tests for it. */
1733 #ifdef SYSCALL_NUM_RET_SHARE_REG
1734 # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
1735 #else
1736 # define EXPECT_SYSCALL_RETURN(val, action) \
1737 do { \
1738 errno = 0; \
1739 if (val < 0) { \
1740 EXPECT_EQ(-1, action); \
1741 EXPECT_EQ(-(val), errno); \
1742 } else { \
1743 EXPECT_EQ(val, action); \
1744 } \
1745 } while (0)
1746 #endif
1747
1748 /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
1749 * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
1750 */
1751 #if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
1752 #define HAVE_GETREGS
1753 #endif
1754
1755 /* Architecture-specific syscall fetching routine. */
1756 int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
1757 {
1758 ARCH_REGS regs;
1759 #ifdef HAVE_GETREGS
1760 EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, &regs)) {
1761 TH_LOG("PTRACE_GETREGS failed");
1762 return -1;
1763 }
1764 #else
1765 struct iovec iov;
1766
1767 iov.iov_base = &regs;
1768 iov.iov_len = sizeof(regs);
1769 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
1770 TH_LOG("PTRACE_GETREGSET failed");
1771 return -1;
1772 }
1773 #endif
1774
1775 #if defined(__mips__)
1776 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1777 return regs.SYSCALL_SYSCALL_NUM;
1778 #endif
1779 return regs.SYSCALL_NUM;
1780 }
1781
1782 /* Architecture-specific syscall changing routine. */
1783 void change_syscall(struct __test_metadata *_metadata,
1784 pid_t tracee, int syscall, int result)
1785 {
1786 int ret;
1787 ARCH_REGS regs;
1788 #ifdef HAVE_GETREGS
1789 ret = ptrace(PTRACE_GETREGS, tracee, 0, &regs);
1790 #else
1791 struct iovec iov;
1792 iov.iov_base = &regs;
1793 iov.iov_len = sizeof(regs);
1794 ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
1795 #endif
1796 EXPECT_EQ(0, ret) {}
1797
1798 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1799 defined(__s390__) || defined(__hppa__) || defined(__riscv) || \
1800 defined(__xtensa__) || defined(__csky__) || defined(__sh__)
1801 {
1802 regs.SYSCALL_NUM = syscall;
1803 }
1804 #elif defined(__mips__)
1805 {
1806 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1807 regs.SYSCALL_SYSCALL_NUM = syscall;
1808 else
1809 regs.SYSCALL_NUM = syscall;
1810 }
1811
1812 #elif defined(__arm__)
1813 # ifndef PTRACE_SET_SYSCALL
1814 # define PTRACE_SET_SYSCALL 23
1815 # endif
1816 {
1817 ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
1818 EXPECT_EQ(0, ret);
1819 }
1820
1821 #elif defined(__aarch64__)
1822 # ifndef NT_ARM_SYSTEM_CALL
1823 # define NT_ARM_SYSTEM_CALL 0x404
1824 # endif
1825 {
1826 iov.iov_base = &syscall;
1827 iov.iov_len = sizeof(syscall);
1828 ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
1829 &iov);
1830 EXPECT_EQ(0, ret);
1831 }
1832
1833 #else
1834 ASSERT_EQ(1, 0) {
1835 TH_LOG("How is the syscall changed on this architecture?");
1836 }
1837 #endif
1838
1839 /* If syscall is skipped, change return value. */
1840 if (syscall == -1)
1841 #ifdef SYSCALL_NUM_RET_SHARE_REG
1842 TH_LOG("Can't modify syscall return on this architecture");
1843
1844 #elif defined(__xtensa__)
1845 regs.SYSCALL_RET(regs) = result;
1846 #else
1847 regs.SYSCALL_RET = result;
1848 #endif
1849
1850 #ifdef HAVE_GETREGS
1851 ret = ptrace(PTRACE_SETREGS, tracee, 0, &regs);
1852 #else
1853 iov.iov_base = &regs;
1854 iov.iov_len = sizeof(regs);
1855 ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
1856 #endif
1857 EXPECT_EQ(0, ret);
1858 }
1859
1860 void tracer_seccomp(struct __test_metadata *_metadata, pid_t tracee,
1861 int status, void *args)
1862 {
1863 int ret;
1864 unsigned long msg;
1865
1866 /* Make sure we got the right message. */
1867 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1868 EXPECT_EQ(0, ret);
1869
1870 /* Validate and take action on expected syscalls. */
1871 switch (msg) {
1872 case 0x1002:
1873 /* change getpid to getppid. */
1874 EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
1875 change_syscall(_metadata, tracee, __NR_getppid, 0);
1876 break;
1877 case 0x1003:
1878 /* skip gettid with valid return code. */
1879 EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
1880 change_syscall(_metadata, tracee, -1, 45000);
1881 break;
1882 case 0x1004:
1883 /* skip openat with error. */
1884 EXPECT_EQ(__NR_openat, get_syscall(_metadata, tracee));
1885 change_syscall(_metadata, tracee, -1, -ESRCH);
1886 break;
1887 case 0x1005:
1888 /* do nothing (allow getppid) */
1889 EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
1890 break;
1891 default:
1892 EXPECT_EQ(0, msg) {
1893 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
1894 kill(tracee, SIGKILL);
1895 }
1896 }
1897
1898 }
1899
1900 void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
1901 int status, void *args)
1902 {
1903 int ret, nr;
1904 unsigned long msg;
1905 static bool entry;
1906
1907 /*
1908 * The traditional way to tell PTRACE_SYSCALL entry/exit
1909 * is by counting.
1910 */
1911 entry = !entry;
1912
1913 /* Make sure we got an appropriate message. */
1914 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1915 EXPECT_EQ(0, ret);
1916 EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
1917 : PTRACE_EVENTMSG_SYSCALL_EXIT, msg);
1918
1919 if (!entry)
1920 return;
1921
1922 nr = get_syscall(_metadata, tracee);
1923
1924 if (nr == __NR_getpid)
1925 change_syscall(_metadata, tracee, __NR_getppid, 0);
1926 if (nr == __NR_gettid)
1927 change_syscall(_metadata, tracee, -1, 45000);
1928 if (nr == __NR_openat)
1929 change_syscall(_metadata, tracee, -1, -ESRCH);
1930 }
1931
1932 FIXTURE(TRACE_syscall) {
1933 struct sock_fprog prog;
1934 pid_t tracer, mytid, mypid, parent;
1935 };
1936
1937 FIXTURE_VARIANT(TRACE_syscall) {
1938 /*
1939 * All of the SECCOMP_RET_TRACE behaviors can be tested with either
1940 * SECCOMP_RET_TRACE+PTRACE_CONT or plain ptrace()+PTRACE_SYSCALL.
1941 * This indicates if we should use SECCOMP_RET_TRACE (false), or
1942 * ptrace (true).
1943 */
1944 bool use_ptrace;
1945 };
1946
1947 FIXTURE_VARIANT_ADD(TRACE_syscall, ptrace) {
1948 .use_ptrace = true,
1949 };
1950
1951 FIXTURE_VARIANT_ADD(TRACE_syscall, seccomp) {
1952 .use_ptrace = false,
1953 };
1954
1955 FIXTURE_SETUP(TRACE_syscall)
1956 {
1957 struct sock_filter filter[] = {
1958 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1959 offsetof(struct seccomp_data, nr)),
1960 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1961 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
1962 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
1963 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
1964 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_openat, 0, 1),
1965 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
1966 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1967 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1005),
1968 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1969 };
1970 struct sock_fprog prog = {
1971 .len = (unsigned short)ARRAY_SIZE(filter),
1972 .filter = filter,
1973 };
1974 long ret;
1975
1976 /* Prepare some testable syscall results. */
1977 self->mytid = syscall(__NR_gettid);
1978 ASSERT_GT(self->mytid, 0);
1979 ASSERT_NE(self->mytid, 1) {
1980 TH_LOG("Running this test as init is not supported. :)");
1981 }
1982
1983 self->mypid = getpid();
1984 ASSERT_GT(self->mypid, 0);
1985 ASSERT_EQ(self->mytid, self->mypid);
1986
1987 self->parent = getppid();
1988 ASSERT_GT(self->parent, 0);
1989 ASSERT_NE(self->parent, self->mypid);
1990
1991 /* Launch tracer. */
1992 self->tracer = setup_trace_fixture(_metadata,
1993 variant->use_ptrace ? tracer_ptrace
1994 : tracer_seccomp,
1995 NULL, variant->use_ptrace);
1996
1997 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1998 ASSERT_EQ(0, ret);
1999
2000 if (variant->use_ptrace)
2001 return;
2002
2003 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2004 ASSERT_EQ(0, ret);
2005 }
2006
2007 FIXTURE_TEARDOWN(TRACE_syscall)
2008 {
2009 teardown_trace_fixture(_metadata, self->tracer);
2010 }
2011
2012 TEST(negative_ENOSYS)
2013 {
2014 /*
2015 * There should be no difference between an "internal" skip
2016 * and userspace asking for syscall "-1".
2017 */
2018 errno = 0;
2019 EXPECT_EQ(-1, syscall(-1));
2020 EXPECT_EQ(errno, ENOSYS);
2021 /* And no difference for "still not valid but not -1". */
2022 errno = 0;
2023 EXPECT_EQ(-1, syscall(-101));
2024 EXPECT_EQ(errno, ENOSYS);
2025 }
2026
2027 TEST_F(TRACE_syscall, negative_ENOSYS)
2028 {
2029 negative_ENOSYS(_metadata);
2030 }
2031
2032 TEST_F(TRACE_syscall, syscall_allowed)
2033 {
2034 /* getppid works as expected (no changes). */
2035 EXPECT_EQ(self->parent, syscall(__NR_getppid));
2036 EXPECT_NE(self->mypid, syscall(__NR_getppid));
2037 }
2038
2039 TEST_F(TRACE_syscall, syscall_redirected)
2040 {
2041 /* getpid has been redirected to getppid as expected. */
2042 EXPECT_EQ(self->parent, syscall(__NR_getpid));
2043 EXPECT_NE(self->mypid, syscall(__NR_getpid));
2044 }
2045
2046 TEST_F(TRACE_syscall, syscall_errno)
2047 {
2048 /* Tracer should skip the open syscall, resulting in ESRCH. */
2049 EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
2050 }
2051
2052 TEST_F(TRACE_syscall, syscall_faked)
2053 {
2054 /* Tracer skips the gettid syscall and store altered return value. */
2055 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
2056 }
2057
2058 TEST_F(TRACE_syscall, skip_after)
2059 {
2060 struct sock_filter filter[] = {
2061 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2062 offsetof(struct seccomp_data, nr)),
2063 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2064 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
2065 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2066 };
2067 struct sock_fprog prog = {
2068 .len = (unsigned short)ARRAY_SIZE(filter),
2069 .filter = filter,
2070 };
2071 long ret;
2072
2073 /* Install additional "errno on getppid" filter. */
2074 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2075 ASSERT_EQ(0, ret);
2076
2077 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
2078 errno = 0;
2079 EXPECT_EQ(-1, syscall(__NR_getpid));
2080 EXPECT_EQ(EPERM, errno);
2081 }
2082
2083 TEST_F_SIGNAL(TRACE_syscall, kill_after, SIGSYS)
2084 {
2085 struct sock_filter filter[] = {
2086 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2087 offsetof(struct seccomp_data, nr)),
2088 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2089 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2090 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2091 };
2092 struct sock_fprog prog = {
2093 .len = (unsigned short)ARRAY_SIZE(filter),
2094 .filter = filter,
2095 };
2096 long ret;
2097
2098 /* Install additional "death on getppid" filter. */
2099 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2100 ASSERT_EQ(0, ret);
2101
2102 /* Tracer will redirect getpid to getppid, and we should die. */
2103 EXPECT_NE(self->mypid, syscall(__NR_getpid));
2104 }
2105
2106 TEST(seccomp_syscall)
2107 {
2108 struct sock_filter filter[] = {
2109 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2110 };
2111 struct sock_fprog prog = {
2112 .len = (unsigned short)ARRAY_SIZE(filter),
2113 .filter = filter,
2114 };
2115 long ret;
2116
2117 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2118 ASSERT_EQ(0, ret) {
2119 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2120 }
2121
2122 /* Reject insane operation. */
2123 ret = seccomp(-1, 0, &prog);
2124 ASSERT_NE(ENOSYS, errno) {
2125 TH_LOG("Kernel does not support seccomp syscall!");
2126 }
2127 EXPECT_EQ(EINVAL, errno) {
2128 TH_LOG("Did not reject crazy op value!");
2129 }
2130
2131 /* Reject strict with flags or pointer. */
2132 ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
2133 EXPECT_EQ(EINVAL, errno) {
2134 TH_LOG("Did not reject mode strict with flags!");
2135 }
2136 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
2137 EXPECT_EQ(EINVAL, errno) {
2138 TH_LOG("Did not reject mode strict with uargs!");
2139 }
2140
2141 /* Reject insane args for filter. */
2142 ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
2143 EXPECT_EQ(EINVAL, errno) {
2144 TH_LOG("Did not reject crazy filter flags!");
2145 }
2146 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
2147 EXPECT_EQ(EFAULT, errno) {
2148 TH_LOG("Did not reject NULL filter!");
2149 }
2150
2151 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2152 EXPECT_EQ(0, errno) {
2153 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
2154 strerror(errno));
2155 }
2156 }
2157
2158 TEST(seccomp_syscall_mode_lock)
2159 {
2160 struct sock_filter filter[] = {
2161 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2162 };
2163 struct sock_fprog prog = {
2164 .len = (unsigned short)ARRAY_SIZE(filter),
2165 .filter = filter,
2166 };
2167 long ret;
2168
2169 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2170 ASSERT_EQ(0, ret) {
2171 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2172 }
2173
2174 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2175 ASSERT_NE(ENOSYS, errno) {
2176 TH_LOG("Kernel does not support seccomp syscall!");
2177 }
2178 EXPECT_EQ(0, ret) {
2179 TH_LOG("Could not install filter!");
2180 }
2181
2182 /* Make sure neither entry point will switch to strict. */
2183 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
2184 EXPECT_EQ(EINVAL, errno) {
2185 TH_LOG("Switched to mode strict!");
2186 }
2187
2188 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
2189 EXPECT_EQ(EINVAL, errno) {
2190 TH_LOG("Switched to mode strict!");
2191 }
2192 }
2193
2194 /*
2195 * Test detection of known and unknown filter flags. Userspace needs to be able
2196 * to check if a filter flag is supported by the current kernel and a good way
2197 * of doing that is by attempting to enter filter mode, with the flag bit in
2198 * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
2199 * that the flag is valid and EINVAL indicates that the flag is invalid.
2200 */
2201 TEST(detect_seccomp_filter_flags)
2202 {
2203 unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC,
2204 SECCOMP_FILTER_FLAG_LOG,
2205 SECCOMP_FILTER_FLAG_SPEC_ALLOW,
2206 SECCOMP_FILTER_FLAG_NEW_LISTENER,
2207 SECCOMP_FILTER_FLAG_TSYNC_ESRCH };
2208 unsigned int exclusive[] = {
2209 SECCOMP_FILTER_FLAG_TSYNC,
2210 SECCOMP_FILTER_FLAG_NEW_LISTENER };
2211 unsigned int flag, all_flags, exclusive_mask;
2212 int i;
2213 long ret;
2214
2215 /* Test detection of individual known-good filter flags */
2216 for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) {
2217 int bits = 0;
2218
2219 flag = flags[i];
2220 /* Make sure the flag is a single bit! */
2221 while (flag) {
2222 if (flag & 0x1)
2223 bits ++;
2224 flag >>= 1;
2225 }
2226 ASSERT_EQ(1, bits);
2227 flag = flags[i];
2228
2229 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2230 ASSERT_NE(ENOSYS, errno) {
2231 TH_LOG("Kernel does not support seccomp syscall!");
2232 }
2233 EXPECT_EQ(-1, ret);
2234 EXPECT_EQ(EFAULT, errno) {
2235 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
2236 flag);
2237 }
2238
2239 all_flags |= flag;
2240 }
2241
2242 /*
2243 * Test detection of all known-good filter flags combined. But
2244 * for the exclusive flags we need to mask them out and try them
2245 * individually for the "all flags" testing.
2246 */
2247 exclusive_mask = 0;
2248 for (i = 0; i < ARRAY_SIZE(exclusive); i++)
2249 exclusive_mask |= exclusive[i];
2250 for (i = 0; i < ARRAY_SIZE(exclusive); i++) {
2251 flag = all_flags & ~exclusive_mask;
2252 flag |= exclusive[i];
2253
2254 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2255 EXPECT_EQ(-1, ret);
2256 EXPECT_EQ(EFAULT, errno) {
2257 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
2258 flag);
2259 }
2260 }
2261
2262 /* Test detection of an unknown filter flags, without exclusives. */
2263 flag = -1;
2264 flag &= ~exclusive_mask;
2265 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2266 EXPECT_EQ(-1, ret);
2267 EXPECT_EQ(EINVAL, errno) {
2268 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
2269 flag);
2270 }
2271
2272 /*
2273 * Test detection of an unknown filter flag that may simply need to be
2274 * added to this test
2275 */
2276 flag = flags[ARRAY_SIZE(flags) - 1] << 1;
2277 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2278 EXPECT_EQ(-1, ret);
2279 EXPECT_EQ(EINVAL, errno) {
2280 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?",
2281 flag);
2282 }
2283 }
2284
2285 TEST(TSYNC_first)
2286 {
2287 struct sock_filter filter[] = {
2288 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2289 };
2290 struct sock_fprog prog = {
2291 .len = (unsigned short)ARRAY_SIZE(filter),
2292 .filter = filter,
2293 };
2294 long ret;
2295
2296 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2297 ASSERT_EQ(0, ret) {
2298 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2299 }
2300
2301 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2302 &prog);
2303 ASSERT_NE(ENOSYS, errno) {
2304 TH_LOG("Kernel does not support seccomp syscall!");
2305 }
2306 EXPECT_EQ(0, ret) {
2307 TH_LOG("Could not install initial filter with TSYNC!");
2308 }
2309 }
2310
2311 #define TSYNC_SIBLINGS 2
2312 struct tsync_sibling {
2313 pthread_t tid;
2314 pid_t system_tid;
2315 sem_t *started;
2316 pthread_cond_t *cond;
2317 pthread_mutex_t *mutex;
2318 int diverge;
2319 int num_waits;
2320 struct sock_fprog *prog;
2321 struct __test_metadata *metadata;
2322 };
2323
2324 /*
2325 * To avoid joining joined threads (which is not allowed by Bionic),
2326 * make sure we both successfully join and clear the tid to skip a
2327 * later join attempt during fixture teardown. Any remaining threads
2328 * will be directly killed during teardown.
2329 */
2330 #define PTHREAD_JOIN(tid, status) \
2331 do { \
2332 int _rc = pthread_join(tid, status); \
2333 if (_rc) { \
2334 TH_LOG("pthread_join of tid %u failed: %d\n", \
2335 (unsigned int)tid, _rc); \
2336 } else { \
2337 tid = 0; \
2338 } \
2339 } while (0)
2340
2341 FIXTURE(TSYNC) {
2342 struct sock_fprog root_prog, apply_prog;
2343 struct tsync_sibling sibling[TSYNC_SIBLINGS];
2344 sem_t started;
2345 pthread_cond_t cond;
2346 pthread_mutex_t mutex;
2347 int sibling_count;
2348 };
2349
2350 FIXTURE_SETUP(TSYNC)
2351 {
2352 struct sock_filter root_filter[] = {
2353 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2354 };
2355 struct sock_filter apply_filter[] = {
2356 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2357 offsetof(struct seccomp_data, nr)),
2358 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
2359 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2360 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2361 };
2362
2363 memset(&self->root_prog, 0, sizeof(self->root_prog));
2364 memset(&self->apply_prog, 0, sizeof(self->apply_prog));
2365 memset(&self->sibling, 0, sizeof(self->sibling));
2366 self->root_prog.filter = malloc(sizeof(root_filter));
2367 ASSERT_NE(NULL, self->root_prog.filter);
2368 memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
2369 self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
2370
2371 self->apply_prog.filter = malloc(sizeof(apply_filter));
2372 ASSERT_NE(NULL, self->apply_prog.filter);
2373 memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
2374 self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
2375
2376 self->sibling_count = 0;
2377 pthread_mutex_init(&self->mutex, NULL);
2378 pthread_cond_init(&self->cond, NULL);
2379 sem_init(&self->started, 0, 0);
2380 self->sibling[0].tid = 0;
2381 self->sibling[0].cond = &self->cond;
2382 self->sibling[0].started = &self->started;
2383 self->sibling[0].mutex = &self->mutex;
2384 self->sibling[0].diverge = 0;
2385 self->sibling[0].num_waits = 1;
2386 self->sibling[0].prog = &self->root_prog;
2387 self->sibling[0].metadata = _metadata;
2388 self->sibling[1].tid = 0;
2389 self->sibling[1].cond = &self->cond;
2390 self->sibling[1].started = &self->started;
2391 self->sibling[1].mutex = &self->mutex;
2392 self->sibling[1].diverge = 0;
2393 self->sibling[1].prog = &self->root_prog;
2394 self->sibling[1].num_waits = 1;
2395 self->sibling[1].metadata = _metadata;
2396 }
2397
2398 FIXTURE_TEARDOWN(TSYNC)
2399 {
2400 int sib = 0;
2401
2402 if (self->root_prog.filter)
2403 free(self->root_prog.filter);
2404 if (self->apply_prog.filter)
2405 free(self->apply_prog.filter);
2406
2407 for ( ; sib < self->sibling_count; ++sib) {
2408 struct tsync_sibling *s = &self->sibling[sib];
2409
2410 if (!s->tid)
2411 continue;
2412 /*
2413 * If a thread is still running, it may be stuck, so hit
2414 * it over the head really hard.
2415 */
2416 pthread_kill(s->tid, 9);
2417 }
2418 pthread_mutex_destroy(&self->mutex);
2419 pthread_cond_destroy(&self->cond);
2420 sem_destroy(&self->started);
2421 }
2422
2423 void *tsync_sibling(void *data)
2424 {
2425 long ret = 0;
2426 struct tsync_sibling *me = data;
2427
2428 me->system_tid = syscall(__NR_gettid);
2429
2430 pthread_mutex_lock(me->mutex);
2431 if (me->diverge) {
2432 /* Just re-apply the root prog to fork the tree */
2433 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
2434 me->prog, 0, 0);
2435 }
2436 sem_post(me->started);
2437 /* Return outside of started so parent notices failures. */
2438 if (ret) {
2439 pthread_mutex_unlock(me->mutex);
2440 return (void *)SIBLING_EXIT_FAILURE;
2441 }
2442 do {
2443 pthread_cond_wait(me->cond, me->mutex);
2444 me->num_waits = me->num_waits - 1;
2445 } while (me->num_waits);
2446 pthread_mutex_unlock(me->mutex);
2447
2448 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
2449 if (!ret)
2450 return (void *)SIBLING_EXIT_NEWPRIVS;
2451 read(0, NULL, 0);
2452 return (void *)SIBLING_EXIT_UNKILLED;
2453 }
2454
2455 void tsync_start_sibling(struct tsync_sibling *sibling)
2456 {
2457 pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
2458 }
2459
2460 TEST_F(TSYNC, siblings_fail_prctl)
2461 {
2462 long ret;
2463 void *status;
2464 struct sock_filter filter[] = {
2465 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2466 offsetof(struct seccomp_data, nr)),
2467 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
2468 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
2469 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2470 };
2471 struct sock_fprog prog = {
2472 .len = (unsigned short)ARRAY_SIZE(filter),
2473 .filter = filter,
2474 };
2475
2476 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2477 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2478 }
2479
2480 /* Check prctl failure detection by requesting sib 0 diverge. */
2481 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2482 ASSERT_NE(ENOSYS, errno) {
2483 TH_LOG("Kernel does not support seccomp syscall!");
2484 }
2485 ASSERT_EQ(0, ret) {
2486 TH_LOG("setting filter failed");
2487 }
2488
2489 self->sibling[0].diverge = 1;
2490 tsync_start_sibling(&self->sibling[0]);
2491 tsync_start_sibling(&self->sibling[1]);
2492
2493 while (self->sibling_count < TSYNC_SIBLINGS) {
2494 sem_wait(&self->started);
2495 self->sibling_count++;
2496 }
2497
2498 /* Signal the threads to clean up*/
2499 pthread_mutex_lock(&self->mutex);
2500 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2501 TH_LOG("cond broadcast non-zero");
2502 }
2503 pthread_mutex_unlock(&self->mutex);
2504
2505 /* Ensure diverging sibling failed to call prctl. */
2506 PTHREAD_JOIN(self->sibling[0].tid, &status);
2507 EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
2508 PTHREAD_JOIN(self->sibling[1].tid, &status);
2509 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2510 }
2511
2512 TEST_F(TSYNC, two_siblings_with_ancestor)
2513 {
2514 long ret;
2515 void *status;
2516
2517 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2518 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2519 }
2520
2521 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2522 ASSERT_NE(ENOSYS, errno) {
2523 TH_LOG("Kernel does not support seccomp syscall!");
2524 }
2525 ASSERT_EQ(0, ret) {
2526 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2527 }
2528 tsync_start_sibling(&self->sibling[0]);
2529 tsync_start_sibling(&self->sibling[1]);
2530
2531 while (self->sibling_count < TSYNC_SIBLINGS) {
2532 sem_wait(&self->started);
2533 self->sibling_count++;
2534 }
2535
2536 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2537 &self->apply_prog);
2538 ASSERT_EQ(0, ret) {
2539 TH_LOG("Could install filter on all threads!");
2540 }
2541 /* Tell the siblings to test the policy */
2542 pthread_mutex_lock(&self->mutex);
2543 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2544 TH_LOG("cond broadcast non-zero");
2545 }
2546 pthread_mutex_unlock(&self->mutex);
2547 /* Ensure they are both killed and don't exit cleanly. */
2548 PTHREAD_JOIN(self->sibling[0].tid, &status);
2549 EXPECT_EQ(0x0, (long)status);
2550 PTHREAD_JOIN(self->sibling[1].tid, &status);
2551 EXPECT_EQ(0x0, (long)status);
2552 }
2553
2554 TEST_F(TSYNC, two_sibling_want_nnp)
2555 {
2556 void *status;
2557
2558 /* start siblings before any prctl() operations */
2559 tsync_start_sibling(&self->sibling[0]);
2560 tsync_start_sibling(&self->sibling[1]);
2561 while (self->sibling_count < TSYNC_SIBLINGS) {
2562 sem_wait(&self->started);
2563 self->sibling_count++;
2564 }
2565
2566 /* Tell the siblings to test no policy */
2567 pthread_mutex_lock(&self->mutex);
2568 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2569 TH_LOG("cond broadcast non-zero");
2570 }
2571 pthread_mutex_unlock(&self->mutex);
2572
2573 /* Ensure they are both upset about lacking nnp. */
2574 PTHREAD_JOIN(self->sibling[0].tid, &status);
2575 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
2576 PTHREAD_JOIN(self->sibling[1].tid, &status);
2577 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
2578 }
2579
2580 TEST_F(TSYNC, two_siblings_with_no_filter)
2581 {
2582 long ret;
2583 void *status;
2584
2585 /* start siblings before any prctl() operations */
2586 tsync_start_sibling(&self->sibling[0]);
2587 tsync_start_sibling(&self->sibling[1]);
2588 while (self->sibling_count < TSYNC_SIBLINGS) {
2589 sem_wait(&self->started);
2590 self->sibling_count++;
2591 }
2592
2593 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2594 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2595 }
2596
2597 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2598 &self->apply_prog);
2599 ASSERT_NE(ENOSYS, errno) {
2600 TH_LOG("Kernel does not support seccomp syscall!");
2601 }
2602 ASSERT_EQ(0, ret) {
2603 TH_LOG("Could install filter on all threads!");
2604 }
2605
2606 /* Tell the siblings to test the policy */
2607 pthread_mutex_lock(&self->mutex);
2608 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2609 TH_LOG("cond broadcast non-zero");
2610 }
2611 pthread_mutex_unlock(&self->mutex);
2612
2613 /* Ensure they are both killed and don't exit cleanly. */
2614 PTHREAD_JOIN(self->sibling[0].tid, &status);
2615 EXPECT_EQ(0x0, (long)status);
2616 PTHREAD_JOIN(self->sibling[1].tid, &status);
2617 EXPECT_EQ(0x0, (long)status);
2618 }
2619
2620 TEST_F(TSYNC, two_siblings_with_one_divergence)
2621 {
2622 long ret;
2623 void *status;
2624
2625 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2626 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2627 }
2628
2629 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2630 ASSERT_NE(ENOSYS, errno) {
2631 TH_LOG("Kernel does not support seccomp syscall!");
2632 }
2633 ASSERT_EQ(0, ret) {
2634 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2635 }
2636 self->sibling[0].diverge = 1;
2637 tsync_start_sibling(&self->sibling[0]);
2638 tsync_start_sibling(&self->sibling[1]);
2639
2640 while (self->sibling_count < TSYNC_SIBLINGS) {
2641 sem_wait(&self->started);
2642 self->sibling_count++;
2643 }
2644
2645 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2646 &self->apply_prog);
2647 ASSERT_EQ(self->sibling[0].system_tid, ret) {
2648 TH_LOG("Did not fail on diverged sibling.");
2649 }
2650
2651 /* Wake the threads */
2652 pthread_mutex_lock(&self->mutex);
2653 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2654 TH_LOG("cond broadcast non-zero");
2655 }
2656 pthread_mutex_unlock(&self->mutex);
2657
2658 /* Ensure they are both unkilled. */
2659 PTHREAD_JOIN(self->sibling[0].tid, &status);
2660 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2661 PTHREAD_JOIN(self->sibling[1].tid, &status);
2662 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2663 }
2664
2665 TEST_F(TSYNC, two_siblings_with_one_divergence_no_tid_in_err)
2666 {
2667 long ret, flags;
2668 void *status;
2669
2670 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2671 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2672 }
2673
2674 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2675 ASSERT_NE(ENOSYS, errno) {
2676 TH_LOG("Kernel does not support seccomp syscall!");
2677 }
2678 ASSERT_EQ(0, ret) {
2679 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2680 }
2681 self->sibling[0].diverge = 1;
2682 tsync_start_sibling(&self->sibling[0]);
2683 tsync_start_sibling(&self->sibling[1]);
2684
2685 while (self->sibling_count < TSYNC_SIBLINGS) {
2686 sem_wait(&self->started);
2687 self->sibling_count++;
2688 }
2689
2690 flags = SECCOMP_FILTER_FLAG_TSYNC | \
2691 SECCOMP_FILTER_FLAG_TSYNC_ESRCH;
2692 ret = seccomp(SECCOMP_SET_MODE_FILTER, flags, &self->apply_prog);
2693 ASSERT_EQ(ESRCH, errno) {
2694 TH_LOG("Did not return ESRCH for diverged sibling.");
2695 }
2696 ASSERT_EQ(-1, ret) {
2697 TH_LOG("Did not fail on diverged sibling.");
2698 }
2699
2700 /* Wake the threads */
2701 pthread_mutex_lock(&self->mutex);
2702 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2703 TH_LOG("cond broadcast non-zero");
2704 }
2705 pthread_mutex_unlock(&self->mutex);
2706
2707 /* Ensure they are both unkilled. */
2708 PTHREAD_JOIN(self->sibling[0].tid, &status);
2709 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2710 PTHREAD_JOIN(self->sibling[1].tid, &status);
2711 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2712 }
2713
2714 TEST_F(TSYNC, two_siblings_not_under_filter)
2715 {
2716 long ret, sib;
2717 void *status;
2718 struct timespec delay = { .tv_nsec = 100000000 };
2719
2720 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2721 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2722 }
2723
2724 /*
2725 * Sibling 0 will have its own seccomp policy
2726 * and Sibling 1 will not be under seccomp at
2727 * all. Sibling 1 will enter seccomp and 0
2728 * will cause failure.
2729 */
2730 self->sibling[0].diverge = 1;
2731 tsync_start_sibling(&self->sibling[0]);
2732 tsync_start_sibling(&self->sibling[1]);
2733
2734 while (self->sibling_count < TSYNC_SIBLINGS) {
2735 sem_wait(&self->started);
2736 self->sibling_count++;
2737 }
2738
2739 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2740 ASSERT_NE(ENOSYS, errno) {
2741 TH_LOG("Kernel does not support seccomp syscall!");
2742 }
2743 ASSERT_EQ(0, ret) {
2744 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2745 }
2746
2747 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2748 &self->apply_prog);
2749 ASSERT_EQ(ret, self->sibling[0].system_tid) {
2750 TH_LOG("Did not fail on diverged sibling.");
2751 }
2752 sib = 1;
2753 if (ret == self->sibling[0].system_tid)
2754 sib = 0;
2755
2756 pthread_mutex_lock(&self->mutex);
2757
2758 /* Increment the other siblings num_waits so we can clean up
2759 * the one we just saw.
2760 */
2761 self->sibling[!sib].num_waits += 1;
2762
2763 /* Signal the thread to clean up*/
2764 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2765 TH_LOG("cond broadcast non-zero");
2766 }
2767 pthread_mutex_unlock(&self->mutex);
2768 PTHREAD_JOIN(self->sibling[sib].tid, &status);
2769 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2770 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2771 while (!kill(self->sibling[sib].system_tid, 0))
2772 nanosleep(&delay, NULL);
2773 /* Switch to the remaining sibling */
2774 sib = !sib;
2775
2776 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2777 &self->apply_prog);
2778 ASSERT_EQ(0, ret) {
2779 TH_LOG("Expected the remaining sibling to sync");
2780 };
2781
2782 pthread_mutex_lock(&self->mutex);
2783
2784 /* If remaining sibling didn't have a chance to wake up during
2785 * the first broadcast, manually reduce the num_waits now.
2786 */
2787 if (self->sibling[sib].num_waits > 1)
2788 self->sibling[sib].num_waits = 1;
2789 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2790 TH_LOG("cond broadcast non-zero");
2791 }
2792 pthread_mutex_unlock(&self->mutex);
2793 PTHREAD_JOIN(self->sibling[sib].tid, &status);
2794 EXPECT_EQ(0, (long)status);
2795 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2796 while (!kill(self->sibling[sib].system_tid, 0))
2797 nanosleep(&delay, NULL);
2798
2799 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2800 &self->apply_prog);
2801 ASSERT_EQ(0, ret); /* just us chickens */
2802 }
2803
2804 /* Make sure restarted syscalls are seen directly as "restart_syscall". */
2805 TEST(syscall_restart)
2806 {
2807 long ret;
2808 unsigned long msg;
2809 pid_t child_pid;
2810 int pipefd[2];
2811 int status;
2812 siginfo_t info = { };
2813 struct sock_filter filter[] = {
2814 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2815 offsetof(struct seccomp_data, nr)),
2816
2817 #ifdef __NR_sigreturn
2818 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 7, 0),
2819 #endif
2820 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 6, 0),
2821 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 5, 0),
2822 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 4, 0),
2823 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 5, 0),
2824 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_clock_nanosleep, 4, 0),
2825 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
2826
2827 /* Allow __NR_write for easy logging. */
2828 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
2829 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2830 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2831 /* The nanosleep jump target. */
2832 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
2833 /* The restart_syscall jump target. */
2834 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
2835 };
2836 struct sock_fprog prog = {
2837 .len = (unsigned short)ARRAY_SIZE(filter),
2838 .filter = filter,
2839 };
2840 #if defined(__arm__)
2841 struct utsname utsbuf;
2842 #endif
2843
2844 ASSERT_EQ(0, pipe(pipefd));
2845
2846 child_pid = fork();
2847 ASSERT_LE(0, child_pid);
2848 if (child_pid == 0) {
2849 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2850 char buf = ' ';
2851 struct timespec timeout = { };
2852
2853 /* Attach parent as tracer and stop. */
2854 EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
2855 EXPECT_EQ(0, raise(SIGSTOP));
2856
2857 EXPECT_EQ(0, close(pipefd[1]));
2858
2859 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2860 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2861 }
2862
2863 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2864 EXPECT_EQ(0, ret) {
2865 TH_LOG("Failed to install filter!");
2866 }
2867
2868 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2869 TH_LOG("Failed to read() sync from parent");
2870 }
2871 EXPECT_EQ('.', buf) {
2872 TH_LOG("Failed to get sync data from read()");
2873 }
2874
2875 /* Start nanosleep to be interrupted. */
2876 timeout.tv_sec = 1;
2877 errno = 0;
2878 EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
2879 TH_LOG("Call to nanosleep() failed (errno %d)", errno);
2880 }
2881
2882 /* Read final sync from parent. */
2883 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2884 TH_LOG("Failed final read() from parent");
2885 }
2886 EXPECT_EQ('!', buf) {
2887 TH_LOG("Failed to get final data from read()");
2888 }
2889
2890 /* Directly report the status of our test harness results. */
2891 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
2892 : EXIT_FAILURE);
2893 }
2894 EXPECT_EQ(0, close(pipefd[0]));
2895
2896 /* Attach to child, setup options, and release. */
2897 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2898 ASSERT_EQ(true, WIFSTOPPED(status));
2899 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
2900 PTRACE_O_TRACESECCOMP));
2901 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2902 ASSERT_EQ(1, write(pipefd[1], ".", 1));
2903
2904 /* Wait for nanosleep() to start. */
2905 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2906 ASSERT_EQ(true, WIFSTOPPED(status));
2907 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2908 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2909 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2910 ASSERT_EQ(0x100, msg);
2911 ret = get_syscall(_metadata, child_pid);
2912 EXPECT_TRUE(ret == __NR_nanosleep || ret == __NR_clock_nanosleep);
2913
2914 /* Might as well check siginfo for sanity while we're here. */
2915 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2916 ASSERT_EQ(SIGTRAP, info.si_signo);
2917 ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
2918 EXPECT_EQ(0, info.si_errno);
2919 EXPECT_EQ(getuid(), info.si_uid);
2920 /* Verify signal delivery came from child (seccomp-triggered). */
2921 EXPECT_EQ(child_pid, info.si_pid);
2922
2923 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
2924 ASSERT_EQ(0, kill(child_pid, SIGSTOP));
2925 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2926 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2927 ASSERT_EQ(true, WIFSTOPPED(status));
2928 ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
2929 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2930 /*
2931 * There is no siginfo on SIGSTOP any more, so we can't verify
2932 * signal delivery came from parent now (getpid() == info.si_pid).
2933 * https://lkml.kernel.org/r/CAGXu5jJaZAOzP1qFz66tYrtbuywqb+UN2SOA1VLHpCCOiYvYeg@mail.gmail.com
2934 * At least verify the SIGSTOP via PTRACE_GETSIGINFO.
2935 */
2936 EXPECT_EQ(SIGSTOP, info.si_signo);
2937
2938 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
2939 ASSERT_EQ(0, kill(child_pid, SIGCONT));
2940 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2941 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2942 ASSERT_EQ(true, WIFSTOPPED(status));
2943 ASSERT_EQ(SIGCONT, WSTOPSIG(status));
2944 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2945
2946 /* Wait for restart_syscall() to start. */
2947 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2948 ASSERT_EQ(true, WIFSTOPPED(status));
2949 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2950 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2951 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2952
2953 ASSERT_EQ(0x200, msg);
2954 ret = get_syscall(_metadata, child_pid);
2955 #if defined(__arm__)
2956 /*
2957 * FIXME:
2958 * - native ARM registers do NOT expose true syscall.
2959 * - compat ARM registers on ARM64 DO expose true syscall.
2960 */
2961 ASSERT_EQ(0, uname(&utsbuf));
2962 if (strncmp(utsbuf.machine, "arm", 3) == 0) {
2963 EXPECT_EQ(__NR_nanosleep, ret);
2964 } else
2965 #endif
2966 {
2967 EXPECT_EQ(__NR_restart_syscall, ret);
2968 }
2969
2970 /* Write again to end test. */
2971 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2972 ASSERT_EQ(1, write(pipefd[1], "!", 1));
2973 EXPECT_EQ(0, close(pipefd[1]));
2974
2975 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2976 if (WIFSIGNALED(status) || WEXITSTATUS(status))
2977 _metadata->passed = 0;
2978 }
2979
2980 TEST_SIGNAL(filter_flag_log, SIGSYS)
2981 {
2982 struct sock_filter allow_filter[] = {
2983 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2984 };
2985 struct sock_filter kill_filter[] = {
2986 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2987 offsetof(struct seccomp_data, nr)),
2988 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
2989 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2990 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2991 };
2992 struct sock_fprog allow_prog = {
2993 .len = (unsigned short)ARRAY_SIZE(allow_filter),
2994 .filter = allow_filter,
2995 };
2996 struct sock_fprog kill_prog = {
2997 .len = (unsigned short)ARRAY_SIZE(kill_filter),
2998 .filter = kill_filter,
2999 };
3000 long ret;
3001 pid_t parent = getppid();
3002
3003 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3004 ASSERT_EQ(0, ret);
3005
3006 /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */
3007 ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG,
3008 &allow_prog);
3009 ASSERT_NE(ENOSYS, errno) {
3010 TH_LOG("Kernel does not support seccomp syscall!");
3011 }
3012 EXPECT_NE(0, ret) {
3013 TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
3014 }
3015 EXPECT_EQ(EINVAL, errno) {
3016 TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
3017 }
3018
3019 /* Verify that a simple, permissive filter can be added with no flags */
3020 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog);
3021 EXPECT_EQ(0, ret);
3022
3023 /* See if the same filter can be added with the FILTER_FLAG_LOG flag */
3024 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
3025 &allow_prog);
3026 ASSERT_NE(EINVAL, errno) {
3027 TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
3028 }
3029 EXPECT_EQ(0, ret);
3030
3031 /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */
3032 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
3033 &kill_prog);
3034 EXPECT_EQ(0, ret);
3035
3036 EXPECT_EQ(parent, syscall(__NR_getppid));
3037 /* getpid() should never return. */
3038 EXPECT_EQ(0, syscall(__NR_getpid));
3039 }
3040
3041 TEST(get_action_avail)
3042 {
3043 __u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP,
3044 SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE,
3045 SECCOMP_RET_LOG, SECCOMP_RET_ALLOW };
3046 __u32 unknown_action = 0x10000000U;
3047 int i;
3048 long ret;
3049
3050 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]);
3051 ASSERT_NE(ENOSYS, errno) {
3052 TH_LOG("Kernel does not support seccomp syscall!");
3053 }
3054 ASSERT_NE(EINVAL, errno) {
3055 TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
3056 }
3057 EXPECT_EQ(ret, 0);
3058
3059 for (i = 0; i < ARRAY_SIZE(actions); i++) {
3060 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]);
3061 EXPECT_EQ(ret, 0) {
3062 TH_LOG("Expected action (0x%X) not available!",
3063 actions[i]);
3064 }
3065 }
3066
3067 /* Check that an unknown action is handled properly (EOPNOTSUPP) */
3068 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action);
3069 EXPECT_EQ(ret, -1);
3070 EXPECT_EQ(errno, EOPNOTSUPP);
3071 }
3072
3073 TEST(get_metadata)
3074 {
3075 pid_t pid;
3076 int pipefd[2];
3077 char buf;
3078 struct seccomp_metadata md;
3079 long ret;
3080
3081 /* Only real root can get metadata. */
3082 if (geteuid()) {
3083 SKIP(return, "get_metadata requires real root");
3084 return;
3085 }
3086
3087 ASSERT_EQ(0, pipe(pipefd));
3088
3089 pid = fork();
3090 ASSERT_GE(pid, 0);
3091 if (pid == 0) {
3092 struct sock_filter filter[] = {
3093 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
3094 };
3095 struct sock_fprog prog = {
3096 .len = (unsigned short)ARRAY_SIZE(filter),
3097 .filter = filter,
3098 };
3099
3100 /* one with log, one without */
3101 EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER,
3102 SECCOMP_FILTER_FLAG_LOG, &prog));
3103 EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog));
3104
3105 EXPECT_EQ(0, close(pipefd[0]));
3106 ASSERT_EQ(1, write(pipefd[1], "1", 1));
3107 ASSERT_EQ(0, close(pipefd[1]));
3108
3109 while (1)
3110 sleep(100);
3111 }
3112
3113 ASSERT_EQ(0, close(pipefd[1]));
3114 ASSERT_EQ(1, read(pipefd[0], &buf, 1));
3115
3116 ASSERT_EQ(0, ptrace(PTRACE_ATTACH, pid));
3117 ASSERT_EQ(pid, waitpid(pid, NULL, 0));
3118
3119 /* Past here must not use ASSERT or child process is never killed. */
3120
3121 md.filter_off = 0;
3122 errno = 0;
3123 ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
3124 EXPECT_EQ(sizeof(md), ret) {
3125 if (errno == EINVAL)
3126 SKIP(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
3127 }
3128
3129 EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG);
3130 EXPECT_EQ(md.filter_off, 0);
3131
3132 md.filter_off = 1;
3133 ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
3134 EXPECT_EQ(sizeof(md), ret);
3135 EXPECT_EQ(md.flags, 0);
3136 EXPECT_EQ(md.filter_off, 1);
3137
3138 skip:
3139 ASSERT_EQ(0, kill(pid, SIGKILL));
3140 }
3141
3142 static int user_notif_syscall(int nr, unsigned int flags)
3143 {
3144 struct sock_filter filter[] = {
3145 BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
3146 offsetof(struct seccomp_data, nr)),
3147 BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, nr, 0, 1),
3148 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_USER_NOTIF),
3149 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
3150 };
3151
3152 struct sock_fprog prog = {
3153 .len = (unsigned short)ARRAY_SIZE(filter),
3154 .filter = filter,
3155 };
3156
3157 return seccomp(SECCOMP_SET_MODE_FILTER, flags, &prog);
3158 }
3159
3160 #define USER_NOTIF_MAGIC INT_MAX
3161 TEST(user_notification_basic)
3162 {
3163 pid_t pid;
3164 long ret;
3165 int status, listener;
3166 struct seccomp_notif req = {};
3167 struct seccomp_notif_resp resp = {};
3168 struct pollfd pollfd;
3169
3170 struct sock_filter filter[] = {
3171 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
3172 };
3173 struct sock_fprog prog = {
3174 .len = (unsigned short)ARRAY_SIZE(filter),
3175 .filter = filter,
3176 };
3177
3178 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3179 ASSERT_EQ(0, ret) {
3180 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3181 }
3182
3183 pid = fork();
3184 ASSERT_GE(pid, 0);
3185
3186 /* Check that we get -ENOSYS with no listener attached */
3187 if (pid == 0) {
3188 if (user_notif_syscall(__NR_getppid, 0) < 0)
3189 exit(1);
3190 ret = syscall(__NR_getppid);
3191 exit(ret >= 0 || errno != ENOSYS);
3192 }
3193
3194 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3195 EXPECT_EQ(true, WIFEXITED(status));
3196 EXPECT_EQ(0, WEXITSTATUS(status));
3197
3198 /* Add some no-op filters for grins. */
3199 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3200 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3201 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3202 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3203
3204 /* Check that the basic notification machinery works */
3205 listener = user_notif_syscall(__NR_getppid,
3206 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3207 ASSERT_GE(listener, 0);
3208
3209 /* Installing a second listener in the chain should EBUSY */
3210 EXPECT_EQ(user_notif_syscall(__NR_getppid,
3211 SECCOMP_FILTER_FLAG_NEW_LISTENER),
3212 -1);
3213 EXPECT_EQ(errno, EBUSY);
3214
3215 pid = fork();
3216 ASSERT_GE(pid, 0);
3217
3218 if (pid == 0) {
3219 ret = syscall(__NR_getppid);
3220 exit(ret != USER_NOTIF_MAGIC);
3221 }
3222
3223 pollfd.fd = listener;
3224 pollfd.events = POLLIN | POLLOUT;
3225
3226 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3227 EXPECT_EQ(pollfd.revents, POLLIN);
3228
3229 /* Test that we can't pass garbage to the kernel. */
3230 memset(&req, 0, sizeof(req));
3231 req.pid = -1;
3232 errno = 0;
3233 ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req);
3234 EXPECT_EQ(-1, ret);
3235 EXPECT_EQ(EINVAL, errno);
3236
3237 if (ret) {
3238 req.pid = 0;
3239 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3240 }
3241
3242 pollfd.fd = listener;
3243 pollfd.events = POLLIN | POLLOUT;
3244
3245 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3246 EXPECT_EQ(pollfd.revents, POLLOUT);
3247
3248 EXPECT_EQ(req.data.nr, __NR_getppid);
3249
3250 resp.id = req.id;
3251 resp.error = 0;
3252 resp.val = USER_NOTIF_MAGIC;
3253
3254 /* check that we make sure flags == 0 */
3255 resp.flags = 1;
3256 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3257 EXPECT_EQ(errno, EINVAL);
3258
3259 resp.flags = 0;
3260 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3261
3262 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3263 EXPECT_EQ(true, WIFEXITED(status));
3264 EXPECT_EQ(0, WEXITSTATUS(status));
3265 }
3266
3267 TEST(user_notification_with_tsync)
3268 {
3269 int ret;
3270 unsigned int flags;
3271
3272 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3273 ASSERT_EQ(0, ret) {
3274 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3275 }
3276
3277 /* these were exclusive */
3278 flags = SECCOMP_FILTER_FLAG_NEW_LISTENER |
3279 SECCOMP_FILTER_FLAG_TSYNC;
3280 ASSERT_EQ(-1, user_notif_syscall(__NR_getppid, flags));
3281 ASSERT_EQ(EINVAL, errno);
3282
3283 /* but now they're not */
3284 flags |= SECCOMP_FILTER_FLAG_TSYNC_ESRCH;
3285 ret = user_notif_syscall(__NR_getppid, flags);
3286 close(ret);
3287 ASSERT_LE(0, ret);
3288 }
3289
3290 TEST(user_notification_kill_in_middle)
3291 {
3292 pid_t pid;
3293 long ret;
3294 int listener;
3295 struct seccomp_notif req = {};
3296 struct seccomp_notif_resp resp = {};
3297
3298 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3299 ASSERT_EQ(0, ret) {
3300 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3301 }
3302
3303 listener = user_notif_syscall(__NR_getppid,
3304 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3305 ASSERT_GE(listener, 0);
3306
3307 /*
3308 * Check that nothing bad happens when we kill the task in the middle
3309 * of a syscall.
3310 */
3311 pid = fork();
3312 ASSERT_GE(pid, 0);
3313
3314 if (pid == 0) {
3315 ret = syscall(__NR_getppid);
3316 exit(ret != USER_NOTIF_MAGIC);
3317 }
3318
3319 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3320 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), 0);
3321
3322 EXPECT_EQ(kill(pid, SIGKILL), 0);
3323 EXPECT_EQ(waitpid(pid, NULL, 0), pid);
3324
3325 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), -1);
3326
3327 resp.id = req.id;
3328 ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp);
3329 EXPECT_EQ(ret, -1);
3330 EXPECT_EQ(errno, ENOENT);
3331 }
3332
3333 static int handled = -1;
3334
3335 static void signal_handler(int signal)
3336 {
3337 if (write(handled, "c", 1) != 1)
3338 perror("write from signal");
3339 }
3340
3341 TEST(user_notification_signal)
3342 {
3343 pid_t pid;
3344 long ret;
3345 int status, listener, sk_pair[2];
3346 struct seccomp_notif req = {};
3347 struct seccomp_notif_resp resp = {};
3348 char c;
3349
3350 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3351 ASSERT_EQ(0, ret) {
3352 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3353 }
3354
3355 ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0);
3356
3357 listener = user_notif_syscall(__NR_gettid,
3358 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3359 ASSERT_GE(listener, 0);
3360
3361 pid = fork();
3362 ASSERT_GE(pid, 0);
3363
3364 if (pid == 0) {
3365 close(sk_pair[0]);
3366 handled = sk_pair[1];
3367 if (signal(SIGUSR1, signal_handler) == SIG_ERR) {
3368 perror("signal");
3369 exit(1);
3370 }
3371 /*
3372 * ERESTARTSYS behavior is a bit hard to test, because we need
3373 * to rely on a signal that has not yet been handled. Let's at
3374 * least check that the error code gets propagated through, and
3375 * hope that it doesn't break when there is actually a signal :)
3376 */
3377 ret = syscall(__NR_gettid);
3378 exit(!(ret == -1 && errno == 512));
3379 }
3380
3381 close(sk_pair[1]);
3382
3383 memset(&req, 0, sizeof(req));
3384 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3385
3386 EXPECT_EQ(kill(pid, SIGUSR1), 0);
3387
3388 /*
3389 * Make sure the signal really is delivered, which means we're not
3390 * stuck in the user notification code any more and the notification
3391 * should be dead.
3392 */
3393 EXPECT_EQ(read(sk_pair[0], &c, 1), 1);
3394
3395 resp.id = req.id;
3396 resp.error = -EPERM;
3397 resp.val = 0;
3398
3399 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3400 EXPECT_EQ(errno, ENOENT);
3401
3402 memset(&req, 0, sizeof(req));
3403 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3404
3405 resp.id = req.id;
3406 resp.error = -512; /* -ERESTARTSYS */
3407 resp.val = 0;
3408
3409 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3410
3411 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3412 EXPECT_EQ(true, WIFEXITED(status));
3413 EXPECT_EQ(0, WEXITSTATUS(status));
3414 }
3415
3416 TEST(user_notification_closed_listener)
3417 {
3418 pid_t pid;
3419 long ret;
3420 int status, listener;
3421
3422 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3423 ASSERT_EQ(0, ret) {
3424 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3425 }
3426
3427 listener = user_notif_syscall(__NR_getppid,
3428 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3429 ASSERT_GE(listener, 0);
3430
3431 /*
3432 * Check that we get an ENOSYS when the listener is closed.
3433 */
3434 pid = fork();
3435 ASSERT_GE(pid, 0);
3436 if (pid == 0) {
3437 close(listener);
3438 ret = syscall(__NR_getppid);
3439 exit(ret != -1 && errno != ENOSYS);
3440 }
3441
3442 close(listener);
3443
3444 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3445 EXPECT_EQ(true, WIFEXITED(status));
3446 EXPECT_EQ(0, WEXITSTATUS(status));
3447 }
3448
3449 /*
3450 * Check that a pid in a child namespace still shows up as valid in ours.
3451 */
3452 TEST(user_notification_child_pid_ns)
3453 {
3454 pid_t pid;
3455 int status, listener;
3456 struct seccomp_notif req = {};
3457 struct seccomp_notif_resp resp = {};
3458
3459 ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0) {
3460 if (errno == EINVAL)
3461 SKIP(return, "kernel missing CLONE_NEWUSER support");
3462 };
3463
3464 listener = user_notif_syscall(__NR_getppid,
3465 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3466 ASSERT_GE(listener, 0);
3467
3468 pid = fork();
3469 ASSERT_GE(pid, 0);
3470
3471 if (pid == 0)
3472 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3473
3474 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3475 EXPECT_EQ(req.pid, pid);
3476
3477 resp.id = req.id;
3478 resp.error = 0;
3479 resp.val = USER_NOTIF_MAGIC;
3480
3481 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3482
3483 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3484 EXPECT_EQ(true, WIFEXITED(status));
3485 EXPECT_EQ(0, WEXITSTATUS(status));
3486 close(listener);
3487 }
3488
3489 /*
3490 * Check that a pid in a sibling (i.e. unrelated) namespace shows up as 0, i.e.
3491 * invalid.
3492 */
3493 TEST(user_notification_sibling_pid_ns)
3494 {
3495 pid_t pid, pid2;
3496 int status, listener;
3497 struct seccomp_notif req = {};
3498 struct seccomp_notif_resp resp = {};
3499
3500 ASSERT_EQ(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0), 0) {
3501 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3502 }
3503
3504 listener = user_notif_syscall(__NR_getppid,
3505 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3506 ASSERT_GE(listener, 0);
3507
3508 pid = fork();
3509 ASSERT_GE(pid, 0);
3510
3511 if (pid == 0) {
3512 ASSERT_EQ(unshare(CLONE_NEWPID), 0);
3513
3514 pid2 = fork();
3515 ASSERT_GE(pid2, 0);
3516
3517 if (pid2 == 0)
3518 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3519
3520 EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
3521 EXPECT_EQ(true, WIFEXITED(status));
3522 EXPECT_EQ(0, WEXITSTATUS(status));
3523 exit(WEXITSTATUS(status));
3524 }
3525
3526 /* Create the sibling ns, and sibling in it. */
3527 ASSERT_EQ(unshare(CLONE_NEWPID), 0) {
3528 if (errno == EPERM)
3529 SKIP(return, "CLONE_NEWPID requires CAP_SYS_ADMIN");
3530 }
3531 ASSERT_EQ(errno, 0);
3532
3533 pid2 = fork();
3534 ASSERT_GE(pid2, 0);
3535
3536 if (pid2 == 0) {
3537 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3538 /*
3539 * The pid should be 0, i.e. the task is in some namespace that
3540 * we can't "see".
3541 */
3542 EXPECT_EQ(req.pid, 0);
3543
3544 resp.id = req.id;
3545 resp.error = 0;
3546 resp.val = USER_NOTIF_MAGIC;
3547
3548 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3549 exit(0);
3550 }
3551
3552 close(listener);
3553
3554 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3555 EXPECT_EQ(true, WIFEXITED(status));
3556 EXPECT_EQ(0, WEXITSTATUS(status));
3557
3558 EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
3559 EXPECT_EQ(true, WIFEXITED(status));
3560 EXPECT_EQ(0, WEXITSTATUS(status));
3561 }
3562
3563 TEST(user_notification_fault_recv)
3564 {
3565 pid_t pid;
3566 int status, listener;
3567 struct seccomp_notif req = {};
3568 struct seccomp_notif_resp resp = {};
3569
3570 ASSERT_EQ(unshare(CLONE_NEWUSER), 0);
3571
3572 listener = user_notif_syscall(__NR_getppid,
3573 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3574 ASSERT_GE(listener, 0);
3575
3576 pid = fork();
3577 ASSERT_GE(pid, 0);
3578
3579 if (pid == 0)
3580 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3581
3582 /* Do a bad recv() */
3583 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, NULL), -1);
3584 EXPECT_EQ(errno, EFAULT);
3585
3586 /* We should still be able to receive this notification, though. */
3587 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3588 EXPECT_EQ(req.pid, pid);
3589
3590 resp.id = req.id;
3591 resp.error = 0;
3592 resp.val = USER_NOTIF_MAGIC;
3593
3594 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3595
3596 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3597 EXPECT_EQ(true, WIFEXITED(status));
3598 EXPECT_EQ(0, WEXITSTATUS(status));
3599 }
3600
3601 TEST(seccomp_get_notif_sizes)
3602 {
3603 struct seccomp_notif_sizes sizes;
3604
3605 ASSERT_EQ(seccomp(SECCOMP_GET_NOTIF_SIZES, 0, &sizes), 0);
3606 EXPECT_EQ(sizes.seccomp_notif, sizeof(struct seccomp_notif));
3607 EXPECT_EQ(sizes.seccomp_notif_resp, sizeof(struct seccomp_notif_resp));
3608 }
3609
3610 TEST(user_notification_continue)
3611 {
3612 pid_t pid;
3613 long ret;
3614 int status, listener;
3615 struct seccomp_notif req = {};
3616 struct seccomp_notif_resp resp = {};
3617 struct pollfd pollfd;
3618
3619 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3620 ASSERT_EQ(0, ret) {
3621 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3622 }
3623
3624 listener = user_notif_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
3625 ASSERT_GE(listener, 0);
3626
3627 pid = fork();
3628 ASSERT_GE(pid, 0);
3629
3630 if (pid == 0) {
3631 int dup_fd, pipe_fds[2];
3632 pid_t self;
3633
3634 ASSERT_GE(pipe(pipe_fds), 0);
3635
3636 dup_fd = dup(pipe_fds[0]);
3637 ASSERT_GE(dup_fd, 0);
3638 EXPECT_NE(pipe_fds[0], dup_fd);
3639
3640 self = getpid();
3641 ASSERT_EQ(filecmp(self, self, pipe_fds[0], dup_fd), 0);
3642 exit(0);
3643 }
3644
3645 pollfd.fd = listener;
3646 pollfd.events = POLLIN | POLLOUT;
3647
3648 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3649 EXPECT_EQ(pollfd.revents, POLLIN);
3650
3651 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3652
3653 pollfd.fd = listener;
3654 pollfd.events = POLLIN | POLLOUT;
3655
3656 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3657 EXPECT_EQ(pollfd.revents, POLLOUT);
3658
3659 EXPECT_EQ(req.data.nr, __NR_dup);
3660
3661 resp.id = req.id;
3662 resp.flags = SECCOMP_USER_NOTIF_FLAG_CONTINUE;
3663
3664 /*
3665 * Verify that setting SECCOMP_USER_NOTIF_FLAG_CONTINUE enforces other
3666 * args be set to 0.
3667 */
3668 resp.error = 0;
3669 resp.val = USER_NOTIF_MAGIC;
3670 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3671 EXPECT_EQ(errno, EINVAL);
3672
3673 resp.error = USER_NOTIF_MAGIC;
3674 resp.val = 0;
3675 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3676 EXPECT_EQ(errno, EINVAL);
3677
3678 resp.error = 0;
3679 resp.val = 0;
3680 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0) {
3681 if (errno == EINVAL)
3682 SKIP(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
3683 }
3684
3685 skip:
3686 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3687 EXPECT_EQ(true, WIFEXITED(status));
3688 EXPECT_EQ(0, WEXITSTATUS(status)) {
3689 if (WEXITSTATUS(status) == 2) {
3690 SKIP(return, "Kernel does not support kcmp() syscall");
3691 return;
3692 }
3693 }
3694 }
3695
3696 TEST(user_notification_filter_empty)
3697 {
3698 pid_t pid;
3699 long ret;
3700 int status;
3701 struct pollfd pollfd;
3702 struct clone_args args = {
3703 .flags = CLONE_FILES,
3704 .exit_signal = SIGCHLD,
3705 };
3706
3707 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3708 ASSERT_EQ(0, ret) {
3709 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3710 }
3711
3712 pid = sys_clone3(&args, sizeof(args));
3713 ASSERT_GE(pid, 0);
3714
3715 if (pid == 0) {
3716 int listener;
3717
3718 listener = user_notif_syscall(__NR_mknod, SECCOMP_FILTER_FLAG_NEW_LISTENER);
3719 if (listener < 0)
3720 _exit(EXIT_FAILURE);
3721
3722 if (dup2(listener, 200) != 200)
3723 _exit(EXIT_FAILURE);
3724
3725 close(listener);
3726
3727 _exit(EXIT_SUCCESS);
3728 }
3729
3730 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3731 EXPECT_EQ(true, WIFEXITED(status));
3732 EXPECT_EQ(0, WEXITSTATUS(status));
3733
3734 /*
3735 * The seccomp filter has become unused so we should be notified once
3736 * the kernel gets around to cleaning up task struct.
3737 */
3738 pollfd.fd = 200;
3739 pollfd.events = POLLHUP;
3740
3741 EXPECT_GT(poll(&pollfd, 1, 2000), 0);
3742 EXPECT_GT((pollfd.revents & POLLHUP) ?: 0, 0);
3743 }
3744
3745 static void *do_thread(void *data)
3746 {
3747 return NULL;
3748 }
3749
3750 TEST(user_notification_filter_empty_threaded)
3751 {
3752 pid_t pid;
3753 long ret;
3754 int status;
3755 struct pollfd pollfd;
3756 struct clone_args args = {
3757 .flags = CLONE_FILES,
3758 .exit_signal = SIGCHLD,
3759 };
3760
3761 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3762 ASSERT_EQ(0, ret) {
3763 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3764 }
3765
3766 pid = sys_clone3(&args, sizeof(args));
3767 ASSERT_GE(pid, 0);
3768
3769 if (pid == 0) {
3770 pid_t pid1, pid2;
3771 int listener, status;
3772 pthread_t thread;
3773
3774 listener = user_notif_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
3775 if (listener < 0)
3776 _exit(EXIT_FAILURE);
3777
3778 if (dup2(listener, 200) != 200)
3779 _exit(EXIT_FAILURE);
3780
3781 close(listener);
3782
3783 pid1 = fork();
3784 if (pid1 < 0)
3785 _exit(EXIT_FAILURE);
3786
3787 if (pid1 == 0)
3788 _exit(EXIT_SUCCESS);
3789
3790 pid2 = fork();
3791 if (pid2 < 0)
3792 _exit(EXIT_FAILURE);
3793
3794 if (pid2 == 0)
3795 _exit(EXIT_SUCCESS);
3796
3797 if (pthread_create(&thread, NULL, do_thread, NULL) ||
3798 pthread_join(thread, NULL))
3799 _exit(EXIT_FAILURE);
3800
3801 if (pthread_create(&thread, NULL, do_thread, NULL) ||
3802 pthread_join(thread, NULL))
3803 _exit(EXIT_FAILURE);
3804
3805 if (waitpid(pid1, &status, 0) != pid1 || !WIFEXITED(status) ||
3806 WEXITSTATUS(status))
3807 _exit(EXIT_FAILURE);
3808
3809 if (waitpid(pid2, &status, 0) != pid2 || !WIFEXITED(status) ||
3810 WEXITSTATUS(status))
3811 _exit(EXIT_FAILURE);
3812
3813 exit(EXIT_SUCCESS);
3814 }
3815
3816 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3817 EXPECT_EQ(true, WIFEXITED(status));
3818 EXPECT_EQ(0, WEXITSTATUS(status));
3819
3820 /*
3821 * The seccomp filter has become unused so we should be notified once
3822 * the kernel gets around to cleaning up task struct.
3823 */
3824 pollfd.fd = 200;
3825 pollfd.events = POLLHUP;
3826
3827 EXPECT_GT(poll(&pollfd, 1, 2000), 0);
3828 EXPECT_GT((pollfd.revents & POLLHUP) ?: 0, 0);
3829 }
3830
3831 TEST(user_notification_addfd)
3832 {
3833 pid_t pid;
3834 long ret;
3835 int status, listener, memfd, fd;
3836 struct seccomp_notif_addfd addfd = {};
3837 struct seccomp_notif_addfd_small small = {};
3838 struct seccomp_notif_addfd_big big = {};
3839 struct seccomp_notif req = {};
3840 struct seccomp_notif_resp resp = {};
3841 /* 100 ms */
3842 struct timespec delay = { .tv_nsec = 100000000 };
3843
3844 memfd = memfd_create("test", 0);
3845 ASSERT_GE(memfd, 0);
3846
3847 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3848 ASSERT_EQ(0, ret) {
3849 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3850 }
3851
3852 /* Check that the basic notification machinery works */
3853 listener = user_notif_syscall(__NR_getppid,
3854 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3855 ASSERT_GE(listener, 0);
3856
3857 pid = fork();
3858 ASSERT_GE(pid, 0);
3859
3860 if (pid == 0) {
3861 if (syscall(__NR_getppid) != USER_NOTIF_MAGIC)
3862 exit(1);
3863 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3864 }
3865
3866 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3867
3868 addfd.srcfd = memfd;
3869 addfd.newfd = 0;
3870 addfd.id = req.id;
3871 addfd.flags = 0x0;
3872
3873 /* Verify bad newfd_flags cannot be set */
3874 addfd.newfd_flags = ~O_CLOEXEC;
3875 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
3876 EXPECT_EQ(errno, EINVAL);
3877 addfd.newfd_flags = O_CLOEXEC;
3878
3879 /* Verify bad flags cannot be set */
3880 addfd.flags = 0xff;
3881 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
3882 EXPECT_EQ(errno, EINVAL);
3883 addfd.flags = 0;
3884
3885 /* Verify that remote_fd cannot be set without setting flags */
3886 addfd.newfd = 1;
3887 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
3888 EXPECT_EQ(errno, EINVAL);
3889 addfd.newfd = 0;
3890
3891 /* Verify small size cannot be set */
3892 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD_SMALL, &small), -1);
3893 EXPECT_EQ(errno, EINVAL);
3894
3895 /* Verify we can't send bits filled in unknown buffer area */
3896 memset(&big, 0xAA, sizeof(big));
3897 big.addfd = addfd;
3898 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD_BIG, &big), -1);
3899 EXPECT_EQ(errno, E2BIG);
3900
3901
3902 /* Verify we can set an arbitrary remote fd */
3903 fd = ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd);
3904 /*
3905 * The child has fds 0(stdin), 1(stdout), 2(stderr), 3(memfd),
3906 * 4(listener), so the newly allocated fd should be 5.
3907 */
3908 EXPECT_EQ(fd, 5);
3909 EXPECT_EQ(filecmp(getpid(), pid, memfd, fd), 0);
3910
3911 /* Verify we can set an arbitrary remote fd with large size */
3912 memset(&big, 0x0, sizeof(big));
3913 big.addfd = addfd;
3914 fd = ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD_BIG, &big);
3915 EXPECT_EQ(fd, 6);
3916
3917 /* Verify we can set a specific remote fd */
3918 addfd.newfd = 42;
3919 addfd.flags = SECCOMP_ADDFD_FLAG_SETFD;
3920 fd = ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd);
3921 EXPECT_EQ(fd, 42);
3922 EXPECT_EQ(filecmp(getpid(), pid, memfd, fd), 0);
3923
3924 /* Resume syscall */
3925 resp.id = req.id;
3926 resp.error = 0;
3927 resp.val = USER_NOTIF_MAGIC;
3928 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3929
3930 /*
3931 * This sets the ID of the ADD FD to the last request plus 1. The
3932 * notification ID increments 1 per notification.
3933 */
3934 addfd.id = req.id + 1;
3935
3936 /* This spins until the underlying notification is generated */
3937 while (ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd) != -1 &&
3938 errno != -EINPROGRESS)
3939 nanosleep(&delay, NULL);
3940
3941 memset(&req, 0, sizeof(req));
3942 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3943 ASSERT_EQ(addfd.id, req.id);
3944
3945 resp.id = req.id;
3946 resp.error = 0;
3947 resp.val = USER_NOTIF_MAGIC;
3948 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3949
3950 /* Wait for child to finish. */
3951 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3952 EXPECT_EQ(true, WIFEXITED(status));
3953 EXPECT_EQ(0, WEXITSTATUS(status));
3954
3955 close(memfd);
3956 }
3957
3958 TEST(user_notification_addfd_rlimit)
3959 {
3960 pid_t pid;
3961 long ret;
3962 int status, listener, memfd;
3963 struct seccomp_notif_addfd addfd = {};
3964 struct seccomp_notif req = {};
3965 struct seccomp_notif_resp resp = {};
3966 const struct rlimit lim = {
3967 .rlim_cur = 0,
3968 .rlim_max = 0,
3969 };
3970
3971 memfd = memfd_create("test", 0);
3972 ASSERT_GE(memfd, 0);
3973
3974 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3975 ASSERT_EQ(0, ret) {
3976 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3977 }
3978
3979 /* Check that the basic notification machinery works */
3980 listener = user_notif_syscall(__NR_getppid,
3981 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3982 ASSERT_GE(listener, 0);
3983
3984 pid = fork();
3985 ASSERT_GE(pid, 0);
3986
3987 if (pid == 0)
3988 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3989
3990
3991 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3992
3993 ASSERT_EQ(prlimit(pid, RLIMIT_NOFILE, &lim, NULL), 0);
3994
3995 addfd.srcfd = memfd;
3996 addfd.newfd_flags = O_CLOEXEC;
3997 addfd.newfd = 0;
3998 addfd.id = req.id;
3999 addfd.flags = 0;
4000
4001 /* Should probably spot check /proc/sys/fs/file-nr */
4002 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
4003 EXPECT_EQ(errno, EMFILE);
4004
4005 addfd.newfd = 100;
4006 addfd.flags = SECCOMP_ADDFD_FLAG_SETFD;
4007 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ADDFD, &addfd), -1);
4008 EXPECT_EQ(errno, EBADF);
4009
4010 resp.id = req.id;
4011 resp.error = 0;
4012 resp.val = USER_NOTIF_MAGIC;
4013
4014 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
4015
4016 /* Wait for child to finish. */
4017 EXPECT_EQ(waitpid(pid, &status, 0), pid);
4018 EXPECT_EQ(true, WIFEXITED(status));
4019 EXPECT_EQ(0, WEXITSTATUS(status));
4020
4021 close(memfd);
4022 }
4023
4024 /*
4025 * TODO:
4026 * - expand NNP testing
4027 * - better arch-specific TRACE and TRAP handlers.
4028 * - endianness checking when appropriate
4029 * - 64-bit arg prodding
4030 * - arch value testing (x86 modes especially)
4031 * - verify that FILTER_FLAG_LOG filters generate log messages
4032 * - verify that RET_LOG generates log messages
4033 */
4034
4035 TEST_HARNESS_MAIN
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