projects / linux-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
seccomp: Rename SECCOMP_RET_KILL to SECCOMP_RET_KILL_THREAD
[linux-block.git] / tools / testing / selftests / seccomp / seccomp_bpf.c
CommitLineData
c99ee51a
KC		 1/*
2 * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
3 * Use of this source code is governed by the GPLv2 license.
4 *
5 * Test code for seccomp bpf.
6 */
7
0ce105bf 8#include <sys/types.h>
c99ee51a
KC		 9#include <asm/siginfo.h>
10#define __have_siginfo_t 1
11#define __have_sigval_t 1
12#define __have_sigevent_t 1
13
14#include <errno.h>
15#include <linux/filter.h>
16#include <sys/prctl.h>
17#include <sys/ptrace.h>
18#include <sys/user.h>
19#include <linux/prctl.h>
20#include <linux/ptrace.h>
21#include <linux/seccomp.h>
c99ee51a
KC		 22#include <pthread.h>
23#include <semaphore.h>
24#include <signal.h>
25#include <stddef.h>
26#include <stdbool.h>
27#include <string.h>
256d0afb 28#include <time.h>
c99ee51a
KC		 29#include <linux/elf.h>
30#include <sys/uio.h>
256d0afb 31#include <sys/utsname.h>
fd88d16c
RS		 32#include <sys/fcntl.h>
33#include <sys/mman.h>
34#include <sys/times.h>
c99ee51a
KC		 35
36#define _GNU_SOURCE
37#include <unistd.h>
38#include <sys/syscall.h>
39
0b40808a 40#include "../kselftest_harness.h"
c99ee51a
KC		 41
42#ifndef PR_SET_PTRACER
43# define PR_SET_PTRACER 0x59616d61
44#endif
45
46#ifndef PR_SET_NO_NEW_PRIVS
47#define PR_SET_NO_NEW_PRIVS 38
48#define PR_GET_NO_NEW_PRIVS 39
49#endif
50
51#ifndef PR_SECCOMP_EXT
52#define PR_SECCOMP_EXT 43
53#endif
54
55#ifndef SECCOMP_EXT_ACT
56#define SECCOMP_EXT_ACT 1
57#endif
58
59#ifndef SECCOMP_EXT_ACT_TSYNC
60#define SECCOMP_EXT_ACT_TSYNC 1
61#endif
62
63#ifndef SECCOMP_MODE_STRICT
64#define SECCOMP_MODE_STRICT 1
65#endif
66
67#ifndef SECCOMP_MODE_FILTER
68#define SECCOMP_MODE_FILTER 2
69#endif
70
fd76875c
KC		 71#ifndef SECCOMP_RET_KILL_THREAD
72#define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */
73#endif
c99ee51a 74#ifndef SECCOMP_RET_KILL
fd76875c
KC		 75#define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
76#define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
77#define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
78#define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
79#define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
59f5cf44
TH		 80#endif
81#ifndef SECCOMP_RET_LOG
fd76875c 82#define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */
59f5cf44 83#endif
c99ee51a 84
59f5cf44 85#ifndef SECCOMP_RET_ACTION
c99ee51a
KC		 86/* Masks for the return value sections. */
87#define SECCOMP_RET_ACTION 0x7fff0000U
88#define SECCOMP_RET_DATA 0x0000ffffU
89
90struct seccomp_data {
91 int nr;
92 __u32 arch;
93 __u64 instruction_pointer;
94 __u64 args[6];
95};
96#endif
97
c385d0db 98#if __BYTE_ORDER == __LITTLE_ENDIAN
c99ee51a 99#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
c385d0db
ME		 100#elif __BYTE_ORDER == __BIG_ENDIAN
101#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
102#else
103#error "wut? Unknown __BYTE_ORDER?!"
104#endif
c99ee51a
KC		 105
106#define SIBLING_EXIT_UNKILLED 0xbadbeef
107#define SIBLING_EXIT_FAILURE 0xbadface
108#define SIBLING_EXIT_NEWPRIVS 0xbadfeed
109
110TEST(mode_strict_support)
111{
112 long ret;
113
114 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
115 ASSERT_EQ(0, ret) {
116 TH_LOG("Kernel does not support CONFIG_SECCOMP");
117 }
118 syscall(__NR_exit, 1);
119}
120
121TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
122{
123 long ret;
124
125 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
126 ASSERT_EQ(0, ret) {
127 TH_LOG("Kernel does not support CONFIG_SECCOMP");
128 }
129 syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
130 NULL, NULL, NULL);
131 EXPECT_FALSE(true) {
132 TH_LOG("Unreachable!");
133 }
134}
135
136/* Note! This doesn't test no new privs behavior */
137TEST(no_new_privs_support)
138{
139 long ret;
140
141 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
142 EXPECT_EQ(0, ret) {
143 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
144 }
145}
146
f3f6e306 147/* Tests kernel support by checking for a copy_from_user() fault on NULL. */
c99ee51a
KC		 148TEST(mode_filter_support)
149{
150 long ret;
151
152 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
153 ASSERT_EQ(0, ret) {
154 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
155 }
156 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL);
157 EXPECT_EQ(-1, ret);
158 EXPECT_EQ(EFAULT, errno) {
159 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
160 }
161}
162
163TEST(mode_filter_without_nnp)
164{
165 struct sock_filter filter[] = {
166 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
167 };
168 struct sock_fprog prog = {
169 .len = (unsigned short)ARRAY_SIZE(filter),
170 .filter = filter,
171 };
172 long ret;
173
174 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
175 ASSERT_LE(0, ret) {
176 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
177 }
178 errno = 0;
179 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
180 /* Succeeds with CAP_SYS_ADMIN, fails without */
181 /* TODO(wad) check caps not euid */
182 if (geteuid()) {
183 EXPECT_EQ(-1, ret);
184 EXPECT_EQ(EACCES, errno);
185 } else {
186 EXPECT_EQ(0, ret);
187 }
188}
189
190#define MAX_INSNS_PER_PATH 32768
191
192TEST(filter_size_limits)
193{
194 int i;
195 int count = BPF_MAXINSNS + 1;
196 struct sock_filter allow[] = {
197 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
198 };
199 struct sock_filter *filter;
200 struct sock_fprog prog = { };
201 long ret;
202
203 filter = calloc(count, sizeof(*filter));
204 ASSERT_NE(NULL, filter);
205
206 for (i = 0; i < count; i++)
207 filter[i] = allow[0];
208
209 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
210 ASSERT_EQ(0, ret);
211
212 prog.filter = filter;
213 prog.len = count;
214
215 /* Too many filter instructions in a single filter. */
216 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
217 ASSERT_NE(0, ret) {
218 TH_LOG("Installing %d insn filter was allowed", prog.len);
219 }
220
221 /* One less is okay, though. */
222 prog.len -= 1;
223 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
224 ASSERT_EQ(0, ret) {
225 TH_LOG("Installing %d insn filter wasn't allowed", prog.len);
226 }
227}
228
229TEST(filter_chain_limits)
230{
231 int i;
232 int count = BPF_MAXINSNS;
233 struct sock_filter allow[] = {
234 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
235 };
236 struct sock_filter *filter;
237 struct sock_fprog prog = { };
238 long ret;
239
240 filter = calloc(count, sizeof(*filter));
241 ASSERT_NE(NULL, filter);
242
243 for (i = 0; i < count; i++)
244 filter[i] = allow[0];
245
246 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
247 ASSERT_EQ(0, ret);
248
249 prog.filter = filter;
250 prog.len = 1;
251
252 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
253 ASSERT_EQ(0, ret);
254
255 prog.len = count;
256
257 /* Too many total filter instructions. */
258 for (i = 0; i < MAX_INSNS_PER_PATH; i++) {
259 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
260 if (ret != 0)
261 break;
262 }
263 ASSERT_NE(0, ret) {
264 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
265 i, count, i * (count + 4));
266 }
267}
268
269TEST(mode_filter_cannot_move_to_strict)
270{
271 struct sock_filter filter[] = {
272 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
273 };
274 struct sock_fprog prog = {
275 .len = (unsigned short)ARRAY_SIZE(filter),
276 .filter = filter,
277 };
278 long ret;
279
280 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
281 ASSERT_EQ(0, ret);
282
283 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
284 ASSERT_EQ(0, ret);
285
286 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0);
287 EXPECT_EQ(-1, ret);
288 EXPECT_EQ(EINVAL, errno);
289}
290
291
292TEST(mode_filter_get_seccomp)
293{
294 struct sock_filter filter[] = {
295 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
296 };
297 struct sock_fprog prog = {
298 .len = (unsigned short)ARRAY_SIZE(filter),
299 .filter = filter,
300 };
301 long ret;
302
303 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
304 ASSERT_EQ(0, ret);
305
306 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
307 EXPECT_EQ(0, ret);
308
309 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
310 ASSERT_EQ(0, ret);
311
312 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
313 EXPECT_EQ(2, ret);
314}
315
316
317TEST(ALLOW_all)
318{
319 struct sock_filter filter[] = {
320 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
321 };
322 struct sock_fprog prog = {
323 .len = (unsigned short)ARRAY_SIZE(filter),
324 .filter = filter,
325 };
326 long ret;
327
328 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
329 ASSERT_EQ(0, ret);
330
331 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
332 ASSERT_EQ(0, ret);
333}
334
335TEST(empty_prog)
336{
337 struct sock_filter filter[] = {
338 };
339 struct sock_fprog prog = {
340 .len = (unsigned short)ARRAY_SIZE(filter),
341 .filter = filter,
342 };
343 long ret;
344
345 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
346 ASSERT_EQ(0, ret);
347
348 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
349 EXPECT_EQ(-1, ret);
350 EXPECT_EQ(EINVAL, errno);
351}
352
59f5cf44
TH		 353TEST(log_all)
354{
355 struct sock_filter filter[] = {
356 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
357 };
358 struct sock_fprog prog = {
359 .len = (unsigned short)ARRAY_SIZE(filter),
360 .filter = filter,
361 };
362 long ret;
363 pid_t parent = getppid();
364
365 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
366 ASSERT_EQ(0, ret);
367
368 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
369 ASSERT_EQ(0, ret);
370
371 /* getppid() should succeed and be logged (no check for logging) */
372 EXPECT_EQ(parent, syscall(__NR_getppid));
373}
374
c99ee51a
KC		 375TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS)
376{
377 struct sock_filter filter[] = {
378 BPF_STMT(BPF_RET|BPF_K, 0x10000000U),
379 };
380 struct sock_fprog prog = {
381 .len = (unsigned short)ARRAY_SIZE(filter),
382 .filter = filter,
383 };
384 long ret;
385
386 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
387 ASSERT_EQ(0, ret);
388
389 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
390 ASSERT_EQ(0, ret);
391 EXPECT_EQ(0, syscall(__NR_getpid)) {
392 TH_LOG("getpid() shouldn't ever return");
393 }
394}
395
396/* return code >= 0x80000000 is unused. */
397TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS)
398{
399 struct sock_filter filter[] = {
400 BPF_STMT(BPF_RET|BPF_K, 0x90000000U),
401 };
402 struct sock_fprog prog = {
403 .len = (unsigned short)ARRAY_SIZE(filter),
404 .filter = filter,
405 };
406 long ret;
407
408 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
409 ASSERT_EQ(0, ret);
410
411 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
412 ASSERT_EQ(0, ret);
413 EXPECT_EQ(0, syscall(__NR_getpid)) {
414 TH_LOG("getpid() shouldn't ever return");
415 }
416}
417
418TEST_SIGNAL(KILL_all, SIGSYS)
419{
420 struct sock_filter filter[] = {
421 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
422 };
423 struct sock_fprog prog = {
424 .len = (unsigned short)ARRAY_SIZE(filter),
425 .filter = filter,
426 };
427 long ret;
428
429 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
430 ASSERT_EQ(0, ret);
431
432 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
433 ASSERT_EQ(0, ret);
434}
435
436TEST_SIGNAL(KILL_one, SIGSYS)
437{
438 struct sock_filter filter[] = {
439 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
440 offsetof(struct seccomp_data, nr)),
441 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
442 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
443 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
444 };
445 struct sock_fprog prog = {
446 .len = (unsigned short)ARRAY_SIZE(filter),
447 .filter = filter,
448 };
449 long ret;
450 pid_t parent = getppid();
451
452 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
453 ASSERT_EQ(0, ret);
454
455 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
456 ASSERT_EQ(0, ret);
457
458 EXPECT_EQ(parent, syscall(__NR_getppid));
459 /* getpid() should never return. */
460 EXPECT_EQ(0, syscall(__NR_getpid));
461}
462
463TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
464{
fd88d16c 465 void *fatal_address;
c99ee51a
KC		 466 struct sock_filter filter[] = {
467 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
468 offsetof(struct seccomp_data, nr)),
fd88d16c 469 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
c99ee51a
KC		 470 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
471 /* Only both with lower 32-bit for now. */
472 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
fd88d16c
RS		 473 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
474 (unsigned long)&fatal_address, 0, 1),
c99ee51a
KC		 475 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
476 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
477 };
478 struct sock_fprog prog = {
479 .len = (unsigned short)ARRAY_SIZE(filter),
480 .filter = filter,
481 };
482 long ret;
483 pid_t parent = getppid();
fd88d16c
RS		 484 struct tms timebuf;
485 clock_t clock = times(&timebuf);
c99ee51a
KC		 486
487 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
488 ASSERT_EQ(0, ret);
489
490 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
491 ASSERT_EQ(0, ret);
492
493 EXPECT_EQ(parent, syscall(__NR_getppid));
fd88d16c
RS		 494 EXPECT_LE(clock, syscall(__NR_times, &timebuf));
495 /* times() should never return. */
496 EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
c99ee51a
KC		 497}
498
499TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
500{
fd88d16c
RS		 501#ifndef __NR_mmap2
502 int sysno = __NR_mmap;
503#else
504 int sysno = __NR_mmap2;
505#endif
c99ee51a
KC		 506 struct sock_filter filter[] = {
507 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
508 offsetof(struct seccomp_data, nr)),
fd88d16c 509 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
c99ee51a
KC		 510 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
511 /* Only both with lower 32-bit for now. */
512 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
513 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
514 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
515 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
516 };
517 struct sock_fprog prog = {
518 .len = (unsigned short)ARRAY_SIZE(filter),
519 .filter = filter,
520 };
521 long ret;
522 pid_t parent = getppid();
fd88d16c
RS		 523 int fd;
524 void *map1, *map2;
2ce47b44
BJZ		 525 int page_size = sysconf(_SC_PAGESIZE);
526
527 ASSERT_LT(0, page_size);
c99ee51a
KC		 528
529 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
530 ASSERT_EQ(0, ret);
531
532 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
533 ASSERT_EQ(0, ret);
534
fd88d16c
RS		 535 fd = open("/dev/zero", O_RDONLY);
536 ASSERT_NE(-1, fd);
537
c99ee51a 538 EXPECT_EQ(parent, syscall(__NR_getppid));
fd88d16c 539 map1 = (void *)syscall(sysno,
2ce47b44 540 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
fd88d16c
RS		 541 EXPECT_NE(MAP_FAILED, map1);
542 /* mmap2() should never return. */
543 map2 = (void *)syscall(sysno,
2ce47b44 544 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
fd88d16c
RS		 545 EXPECT_EQ(MAP_FAILED, map2);
546
547 /* The test failed, so clean up the resources. */
2ce47b44
BJZ		 548 munmap(map1, page_size);
549 munmap(map2, page_size);
fd88d16c 550 close(fd);
c99ee51a
KC		 551}
552
553/* TODO(wad) add 64-bit versus 32-bit arg tests. */
554TEST(arg_out_of_range)
555{
556 struct sock_filter filter[] = {
557 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
558 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
559 };
560 struct sock_fprog prog = {
561 .len = (unsigned short)ARRAY_SIZE(filter),
562 .filter = filter,
563 };
564 long ret;
565
566 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
567 ASSERT_EQ(0, ret);
568
569 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
570 EXPECT_EQ(-1, ret);
571 EXPECT_EQ(EINVAL, errno);
572}
573
f3f6e306
KC		 574#define ERRNO_FILTER(name, errno) \
575 struct sock_filter _read_filter_##name[] = { \
576 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
577 offsetof(struct seccomp_data, nr)), \
578 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
579 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
580 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
581 }; \
582 struct sock_fprog prog_##name = { \
583 .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
584 .filter = _read_filter_##name, \
585 }
586
587/* Make sure basic errno values are correctly passed through a filter. */
c99ee51a
KC		 588TEST(ERRNO_valid)
589{
f3f6e306 590 ERRNO_FILTER(valid, E2BIG);
c99ee51a
KC		 591 long ret;
592 pid_t parent = getppid();
593
594 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
595 ASSERT_EQ(0, ret);
596
f3f6e306 597 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid);
c99ee51a
KC		 598 ASSERT_EQ(0, ret);
599
600 EXPECT_EQ(parent, syscall(__NR_getppid));
601 EXPECT_EQ(-1, read(0, NULL, 0));
602 EXPECT_EQ(E2BIG, errno);
603}
604
f3f6e306 605/* Make sure an errno of zero is correctly handled by the arch code. */
c99ee51a
KC		 606TEST(ERRNO_zero)
607{
f3f6e306 608 ERRNO_FILTER(zero, 0);
c99ee51a
KC		 609 long ret;
610 pid_t parent = getppid();
611
612 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
613 ASSERT_EQ(0, ret);
614
f3f6e306 615 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero);
c99ee51a
KC		 616 ASSERT_EQ(0, ret);
617
618 EXPECT_EQ(parent, syscall(__NR_getppid));
619 /* "errno" of 0 is ok. */
620 EXPECT_EQ(0, read(0, NULL, 0));
621}
622
f3f6e306
KC		 623/*
624 * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller.
625 * This tests that the errno value gets capped correctly, fixed by
626 * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO").
627 */
c99ee51a
KC		 628TEST(ERRNO_capped)
629{
f3f6e306 630 ERRNO_FILTER(capped, 4096);
c99ee51a
KC		 631 long ret;
632 pid_t parent = getppid();
633
634 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
635 ASSERT_EQ(0, ret);
636
f3f6e306 637 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped);
c99ee51a
KC		 638 ASSERT_EQ(0, ret);
639
640 EXPECT_EQ(parent, syscall(__NR_getppid));
641 EXPECT_EQ(-1, read(0, NULL, 0));
642 EXPECT_EQ(4095, errno);
643}
644
f3f6e306
KC		 645/*
646 * Filters are processed in reverse order: last applied is executed first.
647 * Since only the SECCOMP_RET_ACTION mask is tested for return values, the
648 * SECCOMP_RET_DATA mask results will follow the most recently applied
649 * matching filter return (and not the lowest or highest value).
650 */
651TEST(ERRNO_order)
652{
653 ERRNO_FILTER(first, 11);
654 ERRNO_FILTER(second, 13);
655 ERRNO_FILTER(third, 12);
656 long ret;
657 pid_t parent = getppid();
658
659 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
660 ASSERT_EQ(0, ret);
661
662 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first);
663 ASSERT_EQ(0, ret);
664
665 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second);
666 ASSERT_EQ(0, ret);
667
668 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third);
669 ASSERT_EQ(0, ret);
670
671 EXPECT_EQ(parent, syscall(__NR_getppid));
672 EXPECT_EQ(-1, read(0, NULL, 0));
673 EXPECT_EQ(12, errno);
674}
675
c99ee51a
KC		 676FIXTURE_DATA(TRAP) {
677 struct sock_fprog prog;
678};
679
680FIXTURE_SETUP(TRAP)
681{
682 struct sock_filter filter[] = {
683 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
684 offsetof(struct seccomp_data, nr)),
685 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
686 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
687 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
688 };
689
690 memset(&self->prog, 0, sizeof(self->prog));
691 self->prog.filter = malloc(sizeof(filter));
692 ASSERT_NE(NULL, self->prog.filter);
693 memcpy(self->prog.filter, filter, sizeof(filter));
694 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
695}
696
697FIXTURE_TEARDOWN(TRAP)
698{
699 if (self->prog.filter)
700 free(self->prog.filter);
701}
702
703TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
704{
705 long ret;
706
707 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
708 ASSERT_EQ(0, ret);
709
710 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
711 ASSERT_EQ(0, ret);
712 syscall(__NR_getpid);
713}
714
715/* Ensure that SIGSYS overrides SIG_IGN */
716TEST_F_SIGNAL(TRAP, ign, SIGSYS)
717{
718 long ret;
719
720 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
721 ASSERT_EQ(0, ret);
722
723 signal(SIGSYS, SIG_IGN);
724
725 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
726 ASSERT_EQ(0, ret);
727 syscall(__NR_getpid);
728}
729
730static struct siginfo TRAP_info;
731static volatile int TRAP_nr;
732static void TRAP_action(int nr, siginfo_t *info, void *void_context)
733{
734 memcpy(&TRAP_info, info, sizeof(TRAP_info));
735 TRAP_nr = nr;
736}
737
738TEST_F(TRAP, handler)
739{
740 int ret, test;
741 struct sigaction act;
742 sigset_t mask;
743
744 memset(&act, 0, sizeof(act));
745 sigemptyset(&mask);
746 sigaddset(&mask, SIGSYS);
747
748 act.sa_sigaction = &TRAP_action;
749 act.sa_flags = SA_SIGINFO;
750 ret = sigaction(SIGSYS, &act, NULL);
751 ASSERT_EQ(0, ret) {
752 TH_LOG("sigaction failed");
753 }
754 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
755 ASSERT_EQ(0, ret) {
756 TH_LOG("sigprocmask failed");
757 }
758
759 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
760 ASSERT_EQ(0, ret);
761 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
762 ASSERT_EQ(0, ret);
763 TRAP_nr = 0;
764 memset(&TRAP_info, 0, sizeof(TRAP_info));
765 /* Expect the registers to be rolled back. (nr = error) may vary
766 * based on arch. */
767 ret = syscall(__NR_getpid);
768 /* Silence gcc warning about volatile. */
769 test = TRAP_nr;
770 EXPECT_EQ(SIGSYS, test);
771 struct local_sigsys {
772 void *_call_addr; /* calling user insn */
773 int _syscall; /* triggering system call number */
774 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
775 } *sigsys = (struct local_sigsys *)
776#ifdef si_syscall
777 &(TRAP_info.si_call_addr);
778#else
779 &TRAP_info.si_pid;
780#endif
781 EXPECT_EQ(__NR_getpid, sigsys->_syscall);
782 /* Make sure arch is non-zero. */
783 EXPECT_NE(0, sigsys->_arch);
784 EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
785}
786
787FIXTURE_DATA(precedence) {
788 struct sock_fprog allow;
59f5cf44 789 struct sock_fprog log;
c99ee51a
KC		 790 struct sock_fprog trace;
791 struct sock_fprog error;
792 struct sock_fprog trap;
793 struct sock_fprog kill;
794};
795
796FIXTURE_SETUP(precedence)
797{
798 struct sock_filter allow_insns[] = {
799 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
800 };
59f5cf44
TH		 801 struct sock_filter log_insns[] = {
802 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
803 offsetof(struct seccomp_data, nr)),
804 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
805 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
806 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
807 };
c99ee51a
KC		 808 struct sock_filter trace_insns[] = {
809 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
810 offsetof(struct seccomp_data, nr)),
811 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
812 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
813 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
814 };
815 struct sock_filter error_insns[] = {
816 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
817 offsetof(struct seccomp_data, nr)),
818 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
819 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
820 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
821 };
822 struct sock_filter trap_insns[] = {
823 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
824 offsetof(struct seccomp_data, nr)),
825 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
826 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
827 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
828 };
829 struct sock_filter kill_insns[] = {
830 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
831 offsetof(struct seccomp_data, nr)),
832 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
833 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
834 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
835 };
836
837 memset(self, 0, sizeof(*self));
838#define FILTER_ALLOC(_x) \
839 self->_x.filter = malloc(sizeof(_x##_insns)); \
840 ASSERT_NE(NULL, self->_x.filter); \
841 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
842 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
843 FILTER_ALLOC(allow);
59f5cf44 844 FILTER_ALLOC(log);
c99ee51a
KC		 845 FILTER_ALLOC(trace);
846 FILTER_ALLOC(error);
847 FILTER_ALLOC(trap);
848 FILTER_ALLOC(kill);
849}
850
851FIXTURE_TEARDOWN(precedence)
852{
853#define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
854 FILTER_FREE(allow);
59f5cf44 855 FILTER_FREE(log);
c99ee51a
KC		 856 FILTER_FREE(trace);
857 FILTER_FREE(error);
858 FILTER_FREE(trap);
859 FILTER_FREE(kill);
860}
861
862TEST_F(precedence, allow_ok)
863{
864 pid_t parent, res = 0;
865 long ret;
866
867 parent = getppid();
868 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
869 ASSERT_EQ(0, ret);
870
871 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
872 ASSERT_EQ(0, ret);
59f5cf44
TH		 873 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
874 ASSERT_EQ(0, ret);
c99ee51a
KC		 875 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
876 ASSERT_EQ(0, ret);
877 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
878 ASSERT_EQ(0, ret);
879 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
880 ASSERT_EQ(0, ret);
881 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
882 ASSERT_EQ(0, ret);
883 /* Should work just fine. */
884 res = syscall(__NR_getppid);
885 EXPECT_EQ(parent, res);
886}
887
888TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
889{
890 pid_t parent, res = 0;
891 long ret;
892
893 parent = getppid();
894 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
895 ASSERT_EQ(0, ret);
896
897 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
898 ASSERT_EQ(0, ret);
59f5cf44
TH		 899 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
900 ASSERT_EQ(0, ret);
c99ee51a
KC		 901 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
902 ASSERT_EQ(0, ret);
903 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
904 ASSERT_EQ(0, ret);
905 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
906 ASSERT_EQ(0, ret);
907 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
908 ASSERT_EQ(0, ret);
909 /* Should work just fine. */
910 res = syscall(__NR_getppid);
911 EXPECT_EQ(parent, res);
912 /* getpid() should never return. */
913 res = syscall(__NR_getpid);
914 EXPECT_EQ(0, res);
915}
916
917TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
918{
919 pid_t parent;
920 long ret;
921
922 parent = getppid();
923 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
924 ASSERT_EQ(0, ret);
925
926 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
927 ASSERT_EQ(0, ret);
928 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
929 ASSERT_EQ(0, ret);
930 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
931 ASSERT_EQ(0, ret);
59f5cf44
TH		 932 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
933 ASSERT_EQ(0, ret);
c99ee51a
KC		 934 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
935 ASSERT_EQ(0, ret);
936 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
937 ASSERT_EQ(0, ret);
938 /* Should work just fine. */
939 EXPECT_EQ(parent, syscall(__NR_getppid));
940 /* getpid() should never return. */
941 EXPECT_EQ(0, syscall(__NR_getpid));
942}
943
944TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
945{
946 pid_t parent;
947 long ret;
948
949 parent = getppid();
950 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
951 ASSERT_EQ(0, ret);
952
953 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
954 ASSERT_EQ(0, ret);
59f5cf44
TH		 955 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
956 ASSERT_EQ(0, ret);
c99ee51a
KC		 957 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
958 ASSERT_EQ(0, ret);
959 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
960 ASSERT_EQ(0, ret);
961 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
962 ASSERT_EQ(0, ret);
963 /* Should work just fine. */
964 EXPECT_EQ(parent, syscall(__NR_getppid));
965 /* getpid() should never return. */
966 EXPECT_EQ(0, syscall(__NR_getpid));
967}
968
969TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
970{
971 pid_t parent;
972 long ret;
973
974 parent = getppid();
975 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
976 ASSERT_EQ(0, ret);
977
978 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
979 ASSERT_EQ(0, ret);
980 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
981 ASSERT_EQ(0, ret);
59f5cf44
TH		 982 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
983 ASSERT_EQ(0, ret);
c99ee51a
KC		 984 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
985 ASSERT_EQ(0, ret);
986 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
987 ASSERT_EQ(0, ret);
988 /* Should work just fine. */
989 EXPECT_EQ(parent, syscall(__NR_getppid));
990 /* getpid() should never return. */
991 EXPECT_EQ(0, syscall(__NR_getpid));
992}
993
994TEST_F(precedence, errno_is_third)
995{
996 pid_t parent;
997 long ret;
998
999 parent = getppid();
1000 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1001 ASSERT_EQ(0, ret);
1002
1003 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1004 ASSERT_EQ(0, ret);
59f5cf44
TH		 1005 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1006 ASSERT_EQ(0, ret);
c99ee51a
KC		 1007 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1008 ASSERT_EQ(0, ret);
1009 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1010 ASSERT_EQ(0, ret);
1011 /* Should work just fine. */
1012 EXPECT_EQ(parent, syscall(__NR_getppid));
1013 EXPECT_EQ(0, syscall(__NR_getpid));
1014}
1015
1016TEST_F(precedence, errno_is_third_in_any_order)
1017{
1018 pid_t parent;
1019 long ret;
1020
1021 parent = getppid();
1022 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1023 ASSERT_EQ(0, ret);
1024
59f5cf44
TH		 1025 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1026 ASSERT_EQ(0, ret);
c99ee51a
KC		 1027 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1028 ASSERT_EQ(0, ret);
1029 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1030 ASSERT_EQ(0, ret);
1031 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1032 ASSERT_EQ(0, ret);
1033 /* Should work just fine. */
1034 EXPECT_EQ(parent, syscall(__NR_getppid));
1035 EXPECT_EQ(0, syscall(__NR_getpid));
1036}
1037
1038TEST_F(precedence, trace_is_fourth)
1039{
1040 pid_t parent;
1041 long ret;
1042
1043 parent = getppid();
1044 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1045 ASSERT_EQ(0, ret);
1046
1047 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1048 ASSERT_EQ(0, ret);
59f5cf44
TH		 1049 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1050 ASSERT_EQ(0, ret);
c99ee51a
KC		 1051 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1052 ASSERT_EQ(0, ret);
1053 /* Should work just fine. */
1054 EXPECT_EQ(parent, syscall(__NR_getppid));
1055 /* No ptracer */
1056 EXPECT_EQ(-1, syscall(__NR_getpid));
1057}
1058
1059TEST_F(precedence, trace_is_fourth_in_any_order)
1060{
1061 pid_t parent;
1062 long ret;
1063
1064 parent = getppid();
1065 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1066 ASSERT_EQ(0, ret);
1067
1068 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1069 ASSERT_EQ(0, ret);
1070 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1071 ASSERT_EQ(0, ret);
59f5cf44
TH		 1072 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1073 ASSERT_EQ(0, ret);
c99ee51a
KC		 1074 /* Should work just fine. */
1075 EXPECT_EQ(parent, syscall(__NR_getppid));
1076 /* No ptracer */
1077 EXPECT_EQ(-1, syscall(__NR_getpid));
1078}
1079
59f5cf44
TH		 1080TEST_F(precedence, log_is_fifth)
1081{
1082 pid_t mypid, parent;
1083 long ret;
1084
1085 mypid = getpid();
1086 parent = getppid();
1087 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1088 ASSERT_EQ(0, ret);
1089
1090 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1091 ASSERT_EQ(0, ret);
1092 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1093 ASSERT_EQ(0, ret);
1094 /* Should work just fine. */
1095 EXPECT_EQ(parent, syscall(__NR_getppid));
1096 /* Should also work just fine */
1097 EXPECT_EQ(mypid, syscall(__NR_getpid));
1098}
1099
1100TEST_F(precedence, log_is_fifth_in_any_order)
1101{
1102 pid_t mypid, parent;
1103 long ret;
1104
1105 mypid = getpid();
1106 parent = getppid();
1107 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1108 ASSERT_EQ(0, ret);
1109
1110 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1111 ASSERT_EQ(0, ret);
1112 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1113 ASSERT_EQ(0, ret);
1114 /* Should work just fine. */
1115 EXPECT_EQ(parent, syscall(__NR_getppid));
1116 /* Should also work just fine */
1117 EXPECT_EQ(mypid, syscall(__NR_getpid));
1118}
1119
c99ee51a
KC		 1120#ifndef PTRACE_O_TRACESECCOMP
1121#define PTRACE_O_TRACESECCOMP 0x00000080
1122#endif
1123
1124/* Catch the Ubuntu 12.04 value error. */
1125#if PTRACE_EVENT_SECCOMP != 7
1126#undef PTRACE_EVENT_SECCOMP
1127#endif
1128
1129#ifndef PTRACE_EVENT_SECCOMP
1130#define PTRACE_EVENT_SECCOMP 7
1131#endif
1132
1133#define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1134bool tracer_running;
1135void tracer_stop(int sig)
1136{
1137 tracer_running = false;
1138}
1139
1140typedef void tracer_func_t(struct __test_metadata *_metadata,
1141 pid_t tracee, int status, void *args);
1142
58d0a862
KC		 1143void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
1144 tracer_func_t tracer_func, void *args, bool ptrace_syscall)
c99ee51a
KC		 1145{
1146 int ret = -1;
1147 struct sigaction action = {
1148 .sa_handler = tracer_stop,
1149 };
1150
1151 /* Allow external shutdown. */
1152 tracer_running = true;
1153 ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
1154
1155 errno = 0;
1156 while (ret == -1 && errno != EINVAL)
1157 ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
1158 ASSERT_EQ(0, ret) {
1159 kill(tracee, SIGKILL);
1160 }
1161 /* Wait for attach stop */
1162 wait(NULL);
1163
58d0a862
KC		 1164 ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?
1165 PTRACE_O_TRACESYSGOOD :
1166 PTRACE_O_TRACESECCOMP);
c99ee51a
KC		 1167 ASSERT_EQ(0, ret) {
1168 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1169 kill(tracee, SIGKILL);
1170 }
58d0a862
KC		 1171 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1172 tracee, NULL, 0);
1173 ASSERT_EQ(0, ret);
c99ee51a
KC		 1174
1175 /* Unblock the tracee */
1176 ASSERT_EQ(1, write(fd, "A", 1));
1177 ASSERT_EQ(0, close(fd));
1178
1179 /* Run until we're shut down. Must assert to stop execution. */
1180 while (tracer_running) {
1181 int status;
1182
1183 if (wait(&status) != tracee)
1184 continue;
1185 if (WIFSIGNALED(status) || WIFEXITED(status))
1186 /* Child is dead. Time to go. */
1187 return;
1188
58d0a862
KC		 1189 /* Check if this is a seccomp event. */
1190 ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status));
c99ee51a
KC		 1191
1192 tracer_func(_metadata, tracee, status, args);
1193
58d0a862
KC		 1194 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1195 tracee, NULL, 0);
c99ee51a
KC		 1196 ASSERT_EQ(0, ret);
1197 }
1198 /* Directly report the status of our test harness results. */
1199 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
1200}
1201
1202/* Common tracer setup/teardown functions. */
1203void cont_handler(int num)
1204{ }
1205pid_t setup_trace_fixture(struct __test_metadata *_metadata,
58d0a862 1206 tracer_func_t func, void *args, bool ptrace_syscall)
c99ee51a
KC		 1207{
1208 char sync;
1209 int pipefd[2];
1210 pid_t tracer_pid;
1211 pid_t tracee = getpid();
1212
1213 /* Setup a pipe for clean synchronization. */
1214 ASSERT_EQ(0, pipe(pipefd));
1215
1216 /* Fork a child which we'll promote to tracer */
1217 tracer_pid = fork();
1218 ASSERT_LE(0, tracer_pid);
1219 signal(SIGALRM, cont_handler);
1220 if (tracer_pid == 0) {
1221 close(pipefd[0]);
58d0a862
KC		 1222 start_tracer(_metadata, pipefd[1], tracee, func, args,
1223 ptrace_syscall);
c99ee51a
KC		 1224 syscall(__NR_exit, 0);
1225 }
1226 close(pipefd[1]);
1227 prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
1228 read(pipefd[0], &sync, 1);
1229 close(pipefd[0]);
1230
1231 return tracer_pid;
1232}
1233void teardown_trace_fixture(struct __test_metadata *_metadata,
1234 pid_t tracer)
1235{
1236 if (tracer) {
1237 int status;
1238 /*
1239 * Extract the exit code from the other process and
1240 * adopt it for ourselves in case its asserts failed.
1241 */
1242 ASSERT_EQ(0, kill(tracer, SIGUSR1));
1243 ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
1244 if (WEXITSTATUS(status))
1245 _metadata->passed = 0;
1246 }
1247}
1248
1249/* "poke" tracer arguments and function. */
1250struct tracer_args_poke_t {
1251 unsigned long poke_addr;
1252};
1253
1254void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
1255 void *args)
1256{
1257 int ret;
1258 unsigned long msg;
1259 struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
1260
1261 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1262 EXPECT_EQ(0, ret);
1263 /* If this fails, don't try to recover. */
1264 ASSERT_EQ(0x1001, msg) {
1265 kill(tracee, SIGKILL);
1266 }
1267 /*
1268 * Poke in the message.
1269 * Registers are not touched to try to keep this relatively arch
1270 * agnostic.
1271 */
1272 ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
1273 EXPECT_EQ(0, ret);
1274}
1275
1276FIXTURE_DATA(TRACE_poke) {
1277 struct sock_fprog prog;
1278 pid_t tracer;
1279 long poked;
1280 struct tracer_args_poke_t tracer_args;
1281};
1282
1283FIXTURE_SETUP(TRACE_poke)
1284{
1285 struct sock_filter filter[] = {
1286 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1287 offsetof(struct seccomp_data, nr)),
1288 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1289 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
1290 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1291 };
1292
1293 self->poked = 0;
1294 memset(&self->prog, 0, sizeof(self->prog));
1295 self->prog.filter = malloc(sizeof(filter));
1296 ASSERT_NE(NULL, self->prog.filter);
1297 memcpy(self->prog.filter, filter, sizeof(filter));
1298 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1299
1300 /* Set up tracer args. */
1301 self->tracer_args.poke_addr = (unsigned long)&self->poked;
1302
1303 /* Launch tracer. */
1304 self->tracer = setup_trace_fixture(_metadata, tracer_poke,
58d0a862 1305 &self->tracer_args, false);
c99ee51a
KC		 1306}
1307
1308FIXTURE_TEARDOWN(TRACE_poke)
1309{
1310 teardown_trace_fixture(_metadata, self->tracer);
1311 if (self->prog.filter)
1312 free(self->prog.filter);
1313}
1314
1315TEST_F(TRACE_poke, read_has_side_effects)
1316{
1317 ssize_t ret;
1318
1319 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1320 ASSERT_EQ(0, ret);
1321
1322 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1323 ASSERT_EQ(0, ret);
1324
1325 EXPECT_EQ(0, self->poked);
1326 ret = read(-1, NULL, 0);
1327 EXPECT_EQ(-1, ret);
1328 EXPECT_EQ(0x1001, self->poked);
1329}
1330
1331TEST_F(TRACE_poke, getpid_runs_normally)
1332{
1333 long ret;
1334
1335 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1336 ASSERT_EQ(0, ret);
1337
1338 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1339 ASSERT_EQ(0, ret);
1340
1341 EXPECT_EQ(0, self->poked);
1342 EXPECT_NE(0, syscall(__NR_getpid));
1343 EXPECT_EQ(0, self->poked);
1344}
1345
1346#if defined(__x86_64__)
1347# define ARCH_REGS struct user_regs_struct
1348# define SYSCALL_NUM orig_rax
1349# define SYSCALL_RET rax
1350#elif defined(__i386__)
1351# define ARCH_REGS struct user_regs_struct
1352# define SYSCALL_NUM orig_eax
1353# define SYSCALL_RET eax
1354#elif defined(__arm__)
1355# define ARCH_REGS struct pt_regs
1356# define SYSCALL_NUM ARM_r7
1357# define SYSCALL_RET ARM_r0
1358#elif defined(__aarch64__)
1359# define ARCH_REGS struct user_pt_regs
1360# define SYSCALL_NUM regs[8]
1361# define SYSCALL_RET regs[0]
64e2a42b
HD		 1362#elif defined(__hppa__)
1363# define ARCH_REGS struct user_regs_struct
1364# define SYSCALL_NUM gr[20]
1365# define SYSCALL_RET gr[28]
5d83c2b3
ME		 1366#elif defined(__powerpc__)
1367# define ARCH_REGS struct pt_regs
1368# define SYSCALL_NUM gpr[0]
1369# define SYSCALL_RET gpr[3]
b623c4da
KC		 1370#elif defined(__s390__)
1371# define ARCH_REGS s390_regs
1372# define SYSCALL_NUM gprs[2]
1373# define SYSCALL_RET gprs[2]
0ce105bf
MR		 1374#elif defined(__mips__)
1375# define ARCH_REGS struct pt_regs
1376# define SYSCALL_NUM regs[2]
1377# define SYSCALL_SYSCALL_NUM regs[4]
1378# define SYSCALL_RET regs[2]
1379# define SYSCALL_NUM_RET_SHARE_REG
c99ee51a
KC		 1380#else
1381# error "Do not know how to find your architecture's registers and syscalls"
1382#endif
1383
a33b2d03
KC		 1384/* When the syscall return can't be changed, stub out the tests for it. */
1385#ifdef SYSCALL_NUM_RET_SHARE_REG
1386# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
1387#else
1388# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(val, action)
1389#endif
1390
4a0b8807
MS		 1391/* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
1392 * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
1393 */
0ce105bf 1394#if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
4a0b8807
MS		 1395#define HAVE_GETREGS
1396#endif
1397
c99ee51a
KC		 1398/* Architecture-specific syscall fetching routine. */
1399int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
1400{
c99ee51a 1401 ARCH_REGS regs;
4a0b8807
MS		 1402#ifdef HAVE_GETREGS
1403 EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, &regs)) {
1404 TH_LOG("PTRACE_GETREGS failed");
1405 return -1;
1406 }
1407#else
1408 struct iovec iov;
c99ee51a
KC		 1409
1410 iov.iov_base = &regs;
1411 iov.iov_len = sizeof(regs);
1412 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
1413 TH_LOG("PTRACE_GETREGSET failed");
1414 return -1;
1415 }
4a0b8807 1416#endif
c99ee51a 1417
0ce105bf
MR		 1418#if defined(__mips__)
1419 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1420 return regs.SYSCALL_SYSCALL_NUM;
1421#endif
c99ee51a
KC		 1422 return regs.SYSCALL_NUM;
1423}
1424
1425/* Architecture-specific syscall changing routine. */
1426void change_syscall(struct __test_metadata *_metadata,
1427 pid_t tracee, int syscall)
1428{
c99ee51a
KC		 1429 int ret;
1430 ARCH_REGS regs;
4a0b8807
MS		 1431#ifdef HAVE_GETREGS
1432 ret = ptrace(PTRACE_GETREGS, tracee, 0, &regs);
1433#else
1434 struct iovec iov;
c99ee51a
KC		 1435 iov.iov_base = &regs;
1436 iov.iov_len = sizeof(regs);
1437 ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
4a0b8807 1438#endif
34a048cc 1439 EXPECT_EQ(0, ret) {}
c99ee51a 1440
256d0afb 1441#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
64e2a42b 1442 defined(__s390__) || defined(__hppa__)
c99ee51a
KC		 1443 {
1444 regs.SYSCALL_NUM = syscall;
1445 }
0ce105bf
MR		 1446#elif defined(__mips__)
1447 {
1448 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1449 regs.SYSCALL_SYSCALL_NUM = syscall;
1450 else
1451 regs.SYSCALL_NUM = syscall;
1452 }
c99ee51a
KC		 1453
1454#elif defined(__arm__)
1455# ifndef PTRACE_SET_SYSCALL
1456# define PTRACE_SET_SYSCALL 23
1457# endif
1458 {
1459 ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
1460 EXPECT_EQ(0, ret);
1461 }
1462
256d0afb
KC		 1463#elif defined(__aarch64__)
1464# ifndef NT_ARM_SYSTEM_CALL
1465# define NT_ARM_SYSTEM_CALL 0x404
1466# endif
1467 {
1468 iov.iov_base = &syscall;
1469 iov.iov_len = sizeof(syscall);
1470 ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
1471 &iov);
1472 EXPECT_EQ(0, ret);
1473 }
1474
c99ee51a
KC		 1475#else
1476 ASSERT_EQ(1, 0) {
1477 TH_LOG("How is the syscall changed on this architecture?");
1478 }
1479#endif
1480
1481 /* If syscall is skipped, change return value. */
1482 if (syscall == -1)
0ce105bf
MR		 1483#ifdef SYSCALL_NUM_RET_SHARE_REG
1484 TH_LOG("Can't modify syscall return on this architecture");
1485#else
a33b2d03 1486 regs.SYSCALL_RET = EPERM;
0ce105bf 1487#endif
c99ee51a 1488
4a0b8807
MS		 1489#ifdef HAVE_GETREGS
1490 ret = ptrace(PTRACE_SETREGS, tracee, 0, &regs);
1491#else
256d0afb
KC		 1492 iov.iov_base = &regs;
1493 iov.iov_len = sizeof(regs);
c99ee51a 1494 ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
4a0b8807 1495#endif
c99ee51a
KC		 1496 EXPECT_EQ(0, ret);
1497}
1498
1499void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
1500 int status, void *args)
1501{
1502 int ret;
1503 unsigned long msg;
1504
1505 /* Make sure we got the right message. */
1506 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1507 EXPECT_EQ(0, ret);
1508
b623c4da 1509 /* Validate and take action on expected syscalls. */
c99ee51a
KC		 1510 switch (msg) {
1511 case 0x1002:
1512 /* change getpid to getppid. */
b623c4da 1513 EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
c99ee51a
KC		 1514 change_syscall(_metadata, tracee, __NR_getppid);
1515 break;
1516 case 0x1003:
1517 /* skip gettid. */
b623c4da 1518 EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
c99ee51a
KC		 1519 change_syscall(_metadata, tracee, -1);
1520 break;
1521 case 0x1004:
1522 /* do nothing (allow getppid) */
b623c4da 1523 EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
c99ee51a
KC		 1524 break;
1525 default:
1526 EXPECT_EQ(0, msg) {
1527 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
1528 kill(tracee, SIGKILL);
1529 }
1530 }
1531
1532}
1533
58d0a862
KC		 1534void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
1535 int status, void *args)
1536{
1537 int ret, nr;
1538 unsigned long msg;
1539 static bool entry;
1540
1541 /* Make sure we got an empty message. */
1542 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1543 EXPECT_EQ(0, ret);
1544 EXPECT_EQ(0, msg);
1545
1546 /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
1547 entry = !entry;
1548 if (!entry)
1549 return;
1550
1551 nr = get_syscall(_metadata, tracee);
1552
1553 if (nr == __NR_getpid)
1554 change_syscall(_metadata, tracee, __NR_getppid);
a33b2d03
KC		 1555 if (nr == __NR_open)
1556 change_syscall(_metadata, tracee, -1);
58d0a862
KC		 1557}
1558
c99ee51a
KC		 1559FIXTURE_DATA(TRACE_syscall) {
1560 struct sock_fprog prog;
1561 pid_t tracer, mytid, mypid, parent;
1562};
1563
1564FIXTURE_SETUP(TRACE_syscall)
1565{
1566 struct sock_filter filter[] = {
1567 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1568 offsetof(struct seccomp_data, nr)),
1569 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1570 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
1571 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
1572 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
1573 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1574 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
1575 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1576 };
1577
1578 memset(&self->prog, 0, sizeof(self->prog));
1579 self->prog.filter = malloc(sizeof(filter));
1580 ASSERT_NE(NULL, self->prog.filter);
1581 memcpy(self->prog.filter, filter, sizeof(filter));
1582 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1583
1584 /* Prepare some testable syscall results. */
1585 self->mytid = syscall(__NR_gettid);
1586 ASSERT_GT(self->mytid, 0);
1587 ASSERT_NE(self->mytid, 1) {
1588 TH_LOG("Running this test as init is not supported. :)");
1589 }
1590
1591 self->mypid = getpid();
1592 ASSERT_GT(self->mypid, 0);
1593 ASSERT_EQ(self->mytid, self->mypid);
1594
1595 self->parent = getppid();
1596 ASSERT_GT(self->parent, 0);
1597 ASSERT_NE(self->parent, self->mypid);
1598
1599 /* Launch tracer. */
58d0a862
KC		 1600 self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL,
1601 false);
c99ee51a
KC		 1602}
1603
1604FIXTURE_TEARDOWN(TRACE_syscall)
1605{
1606 teardown_trace_fixture(_metadata, self->tracer);
1607 if (self->prog.filter)
1608 free(self->prog.filter);
1609}
1610
a33b2d03
KC		 1611TEST_F(TRACE_syscall, ptrace_syscall_redirected)
1612{
1613 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1614 teardown_trace_fixture(_metadata, self->tracer);
1615 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1616 true);
1617
1618 /* Tracer will redirect getpid to getppid. */
1619 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1620}
1621
1622TEST_F(TRACE_syscall, ptrace_syscall_dropped)
1623{
1624 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1625 teardown_trace_fixture(_metadata, self->tracer);
1626 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1627 true);
1628
1629 /* Tracer should skip the open syscall, resulting in EPERM. */
1630 EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open));
1631}
1632
c99ee51a
KC		 1633TEST_F(TRACE_syscall, syscall_allowed)
1634{
1635 long ret;
1636
1637 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1638 ASSERT_EQ(0, ret);
1639
1640 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1641 ASSERT_EQ(0, ret);
1642
1643 /* getppid works as expected (no changes). */
1644 EXPECT_EQ(self->parent, syscall(__NR_getppid));
1645 EXPECT_NE(self->mypid, syscall(__NR_getppid));
1646}
1647
1648TEST_F(TRACE_syscall, syscall_redirected)
1649{
1650 long ret;
1651
1652 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1653 ASSERT_EQ(0, ret);
1654
1655 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1656 ASSERT_EQ(0, ret);
1657
1658 /* getpid has been redirected to getppid as expected. */
1659 EXPECT_EQ(self->parent, syscall(__NR_getpid));
1660 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1661}
1662
1663TEST_F(TRACE_syscall, syscall_dropped)
1664{
1665 long ret;
1666
1667 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1668 ASSERT_EQ(0, ret);
1669
1670 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1671 ASSERT_EQ(0, ret);
1672
1673 /* gettid has been skipped and an altered return value stored. */
a33b2d03 1674 EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_gettid));
c99ee51a
KC		 1675 EXPECT_NE(self->mytid, syscall(__NR_gettid));
1676}
1677
58d0a862
KC		 1678TEST_F(TRACE_syscall, skip_after_RET_TRACE)
1679{
1680 struct sock_filter filter[] = {
1681 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1682 offsetof(struct seccomp_data, nr)),
1683 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1684 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
1685 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1686 };
1687 struct sock_fprog prog = {
1688 .len = (unsigned short)ARRAY_SIZE(filter),
1689 .filter = filter,
1690 };
1691 long ret;
1692
1693 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1694 ASSERT_EQ(0, ret);
1695
1696 /* Install fixture filter. */
1697 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1698 ASSERT_EQ(0, ret);
1699
1700 /* Install "errno on getppid" filter. */
1701 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
1702 ASSERT_EQ(0, ret);
1703
1704 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
a33b2d03 1705 errno = 0;
58d0a862
KC		 1706 EXPECT_EQ(-1, syscall(__NR_getpid));
1707 EXPECT_EQ(EPERM, errno);
1708}
1709
1710TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
1711{
1712 struct sock_filter filter[] = {
1713 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1714 offsetof(struct seccomp_data, nr)),
1715 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1716 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1717 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1718 };
1719 struct sock_fprog prog = {
1720 .len = (unsigned short)ARRAY_SIZE(filter),
1721 .filter = filter,
1722 };
1723 long ret;
1724
1725 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1726 ASSERT_EQ(0, ret);
1727
1728 /* Install fixture filter. */
1729 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1730 ASSERT_EQ(0, ret);
1731
1732 /* Install "death on getppid" filter. */
1733 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
1734 ASSERT_EQ(0, ret);
1735
1736 /* Tracer will redirect getpid to getppid, and we should die. */
1737 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1738}
1739
1740TEST_F(TRACE_syscall, skip_after_ptrace)
1741{
1742 struct sock_filter filter[] = {
1743 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1744 offsetof(struct seccomp_data, nr)),
1745 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1746 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
1747 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1748 };
1749 struct sock_fprog prog = {
1750 .len = (unsigned short)ARRAY_SIZE(filter),
1751 .filter = filter,
1752 };
1753 long ret;
1754
1755 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1756 teardown_trace_fixture(_metadata, self->tracer);
1757 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1758 true);
1759
1760 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1761 ASSERT_EQ(0, ret);
1762
1763 /* Install "errno on getppid" filter. */
1764 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
1765 ASSERT_EQ(0, ret);
1766
1767 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
1768 EXPECT_EQ(-1, syscall(__NR_getpid));
1769 EXPECT_EQ(EPERM, errno);
1770}
1771
1772TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS)
1773{
1774 struct sock_filter filter[] = {
1775 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1776 offsetof(struct seccomp_data, nr)),
1777 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1778 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1779 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1780 };
1781 struct sock_fprog prog = {
1782 .len = (unsigned short)ARRAY_SIZE(filter),
1783 .filter = filter,
1784 };
1785 long ret;
1786
1787 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1788 teardown_trace_fixture(_metadata, self->tracer);
1789 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1790 true);
1791
1792 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1793 ASSERT_EQ(0, ret);
1794
1795 /* Install "death on getppid" filter. */
1796 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
1797 ASSERT_EQ(0, ret);
1798
1799 /* Tracer will redirect getpid to getppid, and we should die. */
1800 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1801}
1802
c99ee51a
KC		 1803#ifndef __NR_seccomp
1804# if defined(__i386__)
1805# define __NR_seccomp 354
1806# elif defined(__x86_64__)
1807# define __NR_seccomp 317
1808# elif defined(__arm__)
1809# define __NR_seccomp 383
1810# elif defined(__aarch64__)
1811# define __NR_seccomp 277
64e2a42b
HD		 1812# elif defined(__hppa__)
1813# define __NR_seccomp 338
5d83c2b3
ME		 1814# elif defined(__powerpc__)
1815# define __NR_seccomp 358
b623c4da
KC		 1816# elif defined(__s390__)
1817# define __NR_seccomp 348
c99ee51a
KC		 1818# else
1819# warning "seccomp syscall number unknown for this architecture"
1820# define __NR_seccomp 0xffff
1821# endif
1822#endif
1823
1824#ifndef SECCOMP_SET_MODE_STRICT
1825#define SECCOMP_SET_MODE_STRICT 0
1826#endif
1827
1828#ifndef SECCOMP_SET_MODE_FILTER
1829#define SECCOMP_SET_MODE_FILTER 1
1830#endif
1831
d612b1fd
TH		 1832#ifndef SECCOMP_GET_ACTION_AVAIL
1833#define SECCOMP_GET_ACTION_AVAIL 2
1834#endif
1835
6c045d07
MS		 1836#ifndef SECCOMP_FILTER_FLAG_TSYNC
1837#define SECCOMP_FILTER_FLAG_TSYNC 1
c99ee51a
KC		 1838#endif
1839
e66a3997
TH		 1840#ifndef SECCOMP_FILTER_FLAG_LOG
1841#define SECCOMP_FILTER_FLAG_LOG 2
1842#endif
1843
c99ee51a 1844#ifndef seccomp
505ce68c 1845int seccomp(unsigned int op, unsigned int flags, void *args)
c99ee51a
KC		 1846{
1847 errno = 0;
505ce68c 1848 return syscall(__NR_seccomp, op, flags, args);
c99ee51a
KC		 1849}
1850#endif
1851
1852TEST(seccomp_syscall)
1853{
1854 struct sock_filter filter[] = {
1855 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1856 };
1857 struct sock_fprog prog = {
1858 .len = (unsigned short)ARRAY_SIZE(filter),
1859 .filter = filter,
1860 };
1861 long ret;
1862
1863 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1864 ASSERT_EQ(0, ret) {
1865 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1866 }
1867
1868 /* Reject insane operation. */
1869 ret = seccomp(-1, 0, &prog);
b623c4da
KC		 1870 ASSERT_NE(ENOSYS, errno) {
1871 TH_LOG("Kernel does not support seccomp syscall!");
1872 }
c99ee51a
KC		 1873 EXPECT_EQ(EINVAL, errno) {
1874 TH_LOG("Did not reject crazy op value!");
1875 }
1876
1877 /* Reject strict with flags or pointer. */
1878 ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
1879 EXPECT_EQ(EINVAL, errno) {
1880 TH_LOG("Did not reject mode strict with flags!");
1881 }
1882 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
1883 EXPECT_EQ(EINVAL, errno) {
1884 TH_LOG("Did not reject mode strict with uargs!");
1885 }
1886
1887 /* Reject insane args for filter. */
1888 ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
1889 EXPECT_EQ(EINVAL, errno) {
1890 TH_LOG("Did not reject crazy filter flags!");
1891 }
1892 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
1893 EXPECT_EQ(EFAULT, errno) {
1894 TH_LOG("Did not reject NULL filter!");
1895 }
1896
1897 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1898 EXPECT_EQ(0, errno) {
1899 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
1900 strerror(errno));
1901 }
1902}
1903
1904TEST(seccomp_syscall_mode_lock)
1905{
1906 struct sock_filter filter[] = {
1907 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1908 };
1909 struct sock_fprog prog = {
1910 .len = (unsigned short)ARRAY_SIZE(filter),
1911 .filter = filter,
1912 };
1913 long ret;
1914
1915 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
1916 ASSERT_EQ(0, ret) {
1917 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1918 }
1919
1920 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
b623c4da
KC		 1921 ASSERT_NE(ENOSYS, errno) {
1922 TH_LOG("Kernel does not support seccomp syscall!");
1923 }
c99ee51a
KC		 1924 EXPECT_EQ(0, ret) {
1925 TH_LOG("Could not install filter!");
1926 }
1927
1928 /* Make sure neither entry point will switch to strict. */
1929 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
1930 EXPECT_EQ(EINVAL, errno) {
1931 TH_LOG("Switched to mode strict!");
1932 }
1933
1934 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
1935 EXPECT_EQ(EINVAL, errno) {
1936 TH_LOG("Switched to mode strict!");
1937 }
1938}
1939
2b7ea5b5
TH		 1940/*
1941 * Test detection of known and unknown filter flags. Userspace needs to be able
1942 * to check if a filter flag is supported by the current kernel and a good way
1943 * of doing that is by attempting to enter filter mode, with the flag bit in
1944 * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
1945 * that the flag is valid and EINVAL indicates that the flag is invalid.
1946 */
1947TEST(detect_seccomp_filter_flags)
1948{
e66a3997
TH		 1949 unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC,
1950 SECCOMP_FILTER_FLAG_LOG };
2b7ea5b5
TH		 1951 unsigned int flag, all_flags;
1952 int i;
1953 long ret;
1954
1955 /* Test detection of known-good filter flags */
1956 for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) {
1957 flag = flags[i];
1958 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
1959 ASSERT_NE(ENOSYS, errno) {
1960 TH_LOG("Kernel does not support seccomp syscall!");
1961 }
1962 EXPECT_EQ(-1, ret);
1963 EXPECT_EQ(EFAULT, errno) {
1964 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
1965 flag);
1966 }
1967
1968 all_flags |= flag;
1969 }
1970
1971 /* Test detection of all known-good filter flags */
1972 ret = seccomp(SECCOMP_SET_MODE_FILTER, all_flags, NULL);
1973 EXPECT_EQ(-1, ret);
1974 EXPECT_EQ(EFAULT, errno) {
1975 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
1976 all_flags);
1977 }
1978
1979 /* Test detection of an unknown filter flag */
1980 flag = -1;
1981 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
1982 EXPECT_EQ(-1, ret);
1983 EXPECT_EQ(EINVAL, errno) {
1984 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
1985 flag);
1986 }
1987
1988 /*
1989 * Test detection of an unknown filter flag that may simply need to be
1990 * added to this test
1991 */
1992 flag = flags[ARRAY_SIZE(flags) - 1] << 1;
1993 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
1994 EXPECT_EQ(-1, ret);
1995 EXPECT_EQ(EINVAL, errno) {
1996 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?",
1997 flag);
1998 }
1999}
2000
c99ee51a
KC		 2001TEST(TSYNC_first)
2002{
2003 struct sock_filter filter[] = {
2004 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2005 };
2006 struct sock_fprog prog = {
2007 .len = (unsigned short)ARRAY_SIZE(filter),
2008 .filter = filter,
2009 };
2010 long ret;
2011
2012 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2013 ASSERT_EQ(0, ret) {
2014 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2015 }
2016
6c045d07 2017 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a 2018 &prog);
b623c4da
KC		 2019 ASSERT_NE(ENOSYS, errno) {
2020 TH_LOG("Kernel does not support seccomp syscall!");
2021 }
c99ee51a
KC		 2022 EXPECT_EQ(0, ret) {
2023 TH_LOG("Could not install initial filter with TSYNC!");
2024 }
2025}
2026
2027#define TSYNC_SIBLINGS 2
2028struct tsync_sibling {
2029 pthread_t tid;
2030 pid_t system_tid;
2031 sem_t *started;
2032 pthread_cond_t *cond;
2033 pthread_mutex_t *mutex;
2034 int diverge;
2035 int num_waits;
2036 struct sock_fprog *prog;
2037 struct __test_metadata *metadata;
2038};
2039
93bd70e3
KC		 2040/*
2041 * To avoid joining joined threads (which is not allowed by Bionic),
2042 * make sure we both successfully join and clear the tid to skip a
2043 * later join attempt during fixture teardown. Any remaining threads
2044 * will be directly killed during teardown.
2045 */
2046#define PTHREAD_JOIN(tid, status) \
2047 do { \
2048 int _rc = pthread_join(tid, status); \
2049 if (_rc) { \
2050 TH_LOG("pthread_join of tid %u failed: %d\n", \
2051 (unsigned int)tid, _rc); \
2052 } else { \
2053 tid = 0; \
2054 } \
2055 } while (0)
2056
c99ee51a
KC		 2057FIXTURE_DATA(TSYNC) {
2058 struct sock_fprog root_prog, apply_prog;
2059 struct tsync_sibling sibling[TSYNC_SIBLINGS];
2060 sem_t started;
2061 pthread_cond_t cond;
2062 pthread_mutex_t mutex;
2063 int sibling_count;
2064};
2065
2066FIXTURE_SETUP(TSYNC)
2067{
2068 struct sock_filter root_filter[] = {
2069 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2070 };
2071 struct sock_filter apply_filter[] = {
2072 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2073 offsetof(struct seccomp_data, nr)),
2074 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
2075 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2076 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2077 };
2078
2079 memset(&self->root_prog, 0, sizeof(self->root_prog));
2080 memset(&self->apply_prog, 0, sizeof(self->apply_prog));
2081 memset(&self->sibling, 0, sizeof(self->sibling));
2082 self->root_prog.filter = malloc(sizeof(root_filter));
2083 ASSERT_NE(NULL, self->root_prog.filter);
2084 memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
2085 self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
2086
2087 self->apply_prog.filter = malloc(sizeof(apply_filter));
2088 ASSERT_NE(NULL, self->apply_prog.filter);
2089 memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
2090 self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
2091
2092 self->sibling_count = 0;
2093 pthread_mutex_init(&self->mutex, NULL);
2094 pthread_cond_init(&self->cond, NULL);
2095 sem_init(&self->started, 0, 0);
2096 self->sibling[0].tid = 0;
2097 self->sibling[0].cond = &self->cond;
2098 self->sibling[0].started = &self->started;
2099 self->sibling[0].mutex = &self->mutex;
2100 self->sibling[0].diverge = 0;
2101 self->sibling[0].num_waits = 1;
2102 self->sibling[0].prog = &self->root_prog;
2103 self->sibling[0].metadata = _metadata;
2104 self->sibling[1].tid = 0;
2105 self->sibling[1].cond = &self->cond;
2106 self->sibling[1].started = &self->started;
2107 self->sibling[1].mutex = &self->mutex;
2108 self->sibling[1].diverge = 0;
2109 self->sibling[1].prog = &self->root_prog;
2110 self->sibling[1].num_waits = 1;
2111 self->sibling[1].metadata = _metadata;
2112}
2113
2114FIXTURE_TEARDOWN(TSYNC)
2115{
2116 int sib = 0;
2117
2118 if (self->root_prog.filter)
2119 free(self->root_prog.filter);
2120 if (self->apply_prog.filter)
2121 free(self->apply_prog.filter);
2122
2123 for ( ; sib < self->sibling_count; ++sib) {
2124 struct tsync_sibling *s = &self->sibling[sib];
c99ee51a
KC		 2125
2126 if (!s->tid)
2127 continue;
93bd70e3
KC		 2128 /*
2129 * If a thread is still running, it may be stuck, so hit
2130 * it over the head really hard.
2131 */
2132 pthread_kill(s->tid, 9);
c99ee51a
KC		 2133 }
2134 pthread_mutex_destroy(&self->mutex);
2135 pthread_cond_destroy(&self->cond);
2136 sem_destroy(&self->started);
2137}
2138
2139void *tsync_sibling(void *data)
2140{
2141 long ret = 0;
2142 struct tsync_sibling *me = data;
2143
2144 me->system_tid = syscall(__NR_gettid);
2145
2146 pthread_mutex_lock(me->mutex);
2147 if (me->diverge) {
2148 /* Just re-apply the root prog to fork the tree */
2149 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
2150 me->prog, 0, 0);
2151 }
2152 sem_post(me->started);
2153 /* Return outside of started so parent notices failures. */
2154 if (ret) {
2155 pthread_mutex_unlock(me->mutex);
2156 return (void *)SIBLING_EXIT_FAILURE;
2157 }
2158 do {
2159 pthread_cond_wait(me->cond, me->mutex);
2160 me->num_waits = me->num_waits - 1;
2161 } while (me->num_waits);
2162 pthread_mutex_unlock(me->mutex);
2163
2164 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
2165 if (!ret)
2166 return (void *)SIBLING_EXIT_NEWPRIVS;
2167 read(0, NULL, 0);
2168 return (void *)SIBLING_EXIT_UNKILLED;
2169}
2170
2171void tsync_start_sibling(struct tsync_sibling *sibling)
2172{
2173 pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
2174}
2175
2176TEST_F(TSYNC, siblings_fail_prctl)
2177{
2178 long ret;
2179 void *status;
2180 struct sock_filter filter[] = {
2181 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2182 offsetof(struct seccomp_data, nr)),
2183 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
2184 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
2185 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2186 };
2187 struct sock_fprog prog = {
2188 .len = (unsigned short)ARRAY_SIZE(filter),
2189 .filter = filter,
2190 };
2191
2192 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2193 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2194 }
2195
2196 /* Check prctl failure detection by requesting sib 0 diverge. */
2197 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
b623c4da
KC		 2198 ASSERT_NE(ENOSYS, errno) {
2199 TH_LOG("Kernel does not support seccomp syscall!");
2200 }
c99ee51a
KC		 2201 ASSERT_EQ(0, ret) {
2202 TH_LOG("setting filter failed");
2203 }
2204
2205 self->sibling[0].diverge = 1;
2206 tsync_start_sibling(&self->sibling[0]);
2207 tsync_start_sibling(&self->sibling[1]);
2208
2209 while (self->sibling_count < TSYNC_SIBLINGS) {
2210 sem_wait(&self->started);
2211 self->sibling_count++;
2212 }
2213
2214 /* Signal the threads to clean up*/
2215 pthread_mutex_lock(&self->mutex);
2216 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2217 TH_LOG("cond broadcast non-zero");
2218 }
2219 pthread_mutex_unlock(&self->mutex);
2220
2221 /* Ensure diverging sibling failed to call prctl. */
93bd70e3 2222 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2223 EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
93bd70e3 2224 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2225 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2226}
2227
2228TEST_F(TSYNC, two_siblings_with_ancestor)
2229{
2230 long ret;
2231 void *status;
2232
2233 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2234 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2235 }
2236
2237 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
b623c4da
KC		 2238 ASSERT_NE(ENOSYS, errno) {
2239 TH_LOG("Kernel does not support seccomp syscall!");
2240 }
c99ee51a
KC		 2241 ASSERT_EQ(0, ret) {
2242 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2243 }
2244 tsync_start_sibling(&self->sibling[0]);
2245 tsync_start_sibling(&self->sibling[1]);
2246
2247 while (self->sibling_count < TSYNC_SIBLINGS) {
2248 sem_wait(&self->started);
2249 self->sibling_count++;
2250 }
2251
6c045d07 2252 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2253 &self->apply_prog);
2254 ASSERT_EQ(0, ret) {
2255 TH_LOG("Could install filter on all threads!");
2256 }
2257 /* Tell the siblings to test the policy */
2258 pthread_mutex_lock(&self->mutex);
2259 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2260 TH_LOG("cond broadcast non-zero");
2261 }
2262 pthread_mutex_unlock(&self->mutex);
2263 /* Ensure they are both killed and don't exit cleanly. */
93bd70e3 2264 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2265 EXPECT_EQ(0x0, (long)status);
93bd70e3 2266 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2267 EXPECT_EQ(0x0, (long)status);
2268}
2269
2270TEST_F(TSYNC, two_sibling_want_nnp)
2271{
2272 void *status;
2273
2274 /* start siblings before any prctl() operations */
2275 tsync_start_sibling(&self->sibling[0]);
2276 tsync_start_sibling(&self->sibling[1]);
2277 while (self->sibling_count < TSYNC_SIBLINGS) {
2278 sem_wait(&self->started);
2279 self->sibling_count++;
2280 }
2281
2282 /* Tell the siblings to test no policy */
2283 pthread_mutex_lock(&self->mutex);
2284 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2285 TH_LOG("cond broadcast non-zero");
2286 }
2287 pthread_mutex_unlock(&self->mutex);
2288
2289 /* Ensure they are both upset about lacking nnp. */
93bd70e3 2290 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2291 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
93bd70e3 2292 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2293 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
2294}
2295
2296TEST_F(TSYNC, two_siblings_with_no_filter)
2297{
2298 long ret;
2299 void *status;
2300
2301 /* start siblings before any prctl() operations */
2302 tsync_start_sibling(&self->sibling[0]);
2303 tsync_start_sibling(&self->sibling[1]);
2304 while (self->sibling_count < TSYNC_SIBLINGS) {
2305 sem_wait(&self->started);
2306 self->sibling_count++;
2307 }
2308
2309 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2310 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2311 }
2312
6c045d07 2313 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a 2314 &self->apply_prog);
b623c4da
KC		 2315 ASSERT_NE(ENOSYS, errno) {
2316 TH_LOG("Kernel does not support seccomp syscall!");
2317 }
c99ee51a
KC		 2318 ASSERT_EQ(0, ret) {
2319 TH_LOG("Could install filter on all threads!");
2320 }
2321
2322 /* Tell the siblings to test the policy */
2323 pthread_mutex_lock(&self->mutex);
2324 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2325 TH_LOG("cond broadcast non-zero");
2326 }
2327 pthread_mutex_unlock(&self->mutex);
2328
2329 /* Ensure they are both killed and don't exit cleanly. */
93bd70e3 2330 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2331 EXPECT_EQ(0x0, (long)status);
93bd70e3 2332 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2333 EXPECT_EQ(0x0, (long)status);
2334}
2335
2336TEST_F(TSYNC, two_siblings_with_one_divergence)
2337{
2338 long ret;
2339 void *status;
2340
2341 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2342 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2343 }
2344
2345 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
b623c4da
KC		 2346 ASSERT_NE(ENOSYS, errno) {
2347 TH_LOG("Kernel does not support seccomp syscall!");
2348 }
c99ee51a
KC		 2349 ASSERT_EQ(0, ret) {
2350 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2351 }
2352 self->sibling[0].diverge = 1;
2353 tsync_start_sibling(&self->sibling[0]);
2354 tsync_start_sibling(&self->sibling[1]);
2355
2356 while (self->sibling_count < TSYNC_SIBLINGS) {
2357 sem_wait(&self->started);
2358 self->sibling_count++;
2359 }
2360
6c045d07 2361 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2362 &self->apply_prog);
2363 ASSERT_EQ(self->sibling[0].system_tid, ret) {
2364 TH_LOG("Did not fail on diverged sibling.");
2365 }
2366
2367 /* Wake the threads */
2368 pthread_mutex_lock(&self->mutex);
2369 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2370 TH_LOG("cond broadcast non-zero");
2371 }
2372 pthread_mutex_unlock(&self->mutex);
2373
2374 /* Ensure they are both unkilled. */
93bd70e3 2375 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2376 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
93bd70e3 2377 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2378 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2379}
2380
2381TEST_F(TSYNC, two_siblings_not_under_filter)
2382{
2383 long ret, sib;
2384 void *status;
2385
2386 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2387 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2388 }
2389
2390 /*
2391 * Sibling 0 will have its own seccomp policy
2392 * and Sibling 1 will not be under seccomp at
2393 * all. Sibling 1 will enter seccomp and 0
2394 * will cause failure.
2395 */
2396 self->sibling[0].diverge = 1;
2397 tsync_start_sibling(&self->sibling[0]);
2398 tsync_start_sibling(&self->sibling[1]);
2399
2400 while (self->sibling_count < TSYNC_SIBLINGS) {
2401 sem_wait(&self->started);
2402 self->sibling_count++;
2403 }
2404
2405 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
b623c4da
KC		 2406 ASSERT_NE(ENOSYS, errno) {
2407 TH_LOG("Kernel does not support seccomp syscall!");
2408 }
c99ee51a
KC		 2409 ASSERT_EQ(0, ret) {
2410 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2411 }
2412
6c045d07 2413 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2414 &self->apply_prog);
2415 ASSERT_EQ(ret, self->sibling[0].system_tid) {
2416 TH_LOG("Did not fail on diverged sibling.");
2417 }
2418 sib = 1;
2419 if (ret == self->sibling[0].system_tid)
2420 sib = 0;
2421
2422 pthread_mutex_lock(&self->mutex);
2423
2424 /* Increment the other siblings num_waits so we can clean up
2425 * the one we just saw.
2426 */
2427 self->sibling[!sib].num_waits += 1;
2428
2429 /* Signal the thread to clean up*/
2430 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2431 TH_LOG("cond broadcast non-zero");
2432 }
2433 pthread_mutex_unlock(&self->mutex);
93bd70e3 2434 PTHREAD_JOIN(self->sibling[sib].tid, &status);
c99ee51a
KC		 2435 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2436 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2437 while (!kill(self->sibling[sib].system_tid, 0))
2438 sleep(0.1);
2439 /* Switch to the remaining sibling */
2440 sib = !sib;
2441
6c045d07 2442 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2443 &self->apply_prog);
2444 ASSERT_EQ(0, ret) {
2445 TH_LOG("Expected the remaining sibling to sync");
2446 };
2447
2448 pthread_mutex_lock(&self->mutex);
2449
2450 /* If remaining sibling didn't have a chance to wake up during
2451 * the first broadcast, manually reduce the num_waits now.
2452 */
2453 if (self->sibling[sib].num_waits > 1)
2454 self->sibling[sib].num_waits = 1;
2455 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2456 TH_LOG("cond broadcast non-zero");
2457 }
2458 pthread_mutex_unlock(&self->mutex);
93bd70e3 2459 PTHREAD_JOIN(self->sibling[sib].tid, &status);
c99ee51a
KC		 2460 EXPECT_EQ(0, (long)status);
2461 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2462 while (!kill(self->sibling[sib].system_tid, 0))
2463 sleep(0.1);
2464
6c045d07 2465 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2466 &self->apply_prog);
2467 ASSERT_EQ(0, ret); /* just us chickens */
2468}
2469
2470/* Make sure restarted syscalls are seen directly as "restart_syscall". */
2471TEST(syscall_restart)
2472{
2473 long ret;
2474 unsigned long msg;
2475 pid_t child_pid;
2476 int pipefd[2];
2477 int status;
2478 siginfo_t info = { };
2479 struct sock_filter filter[] = {
2480 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2481 offsetof(struct seccomp_data, nr)),
2482
2483#ifdef __NR_sigreturn
2484 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0),
2485#endif
2486 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0),
2487 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0),
2488 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0),
256d0afb 2489 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0),
c99ee51a
KC		 2490 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
2491
2492 /* Allow __NR_write for easy logging. */
2493 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
2494 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2495 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
256d0afb
KC		 2496 /* The nanosleep jump target. */
2497 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
2498 /* The restart_syscall jump target. */
2499 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
c99ee51a
KC		 2500 };
2501 struct sock_fprog prog = {
2502 .len = (unsigned short)ARRAY_SIZE(filter),
2503 .filter = filter,
2504 };
256d0afb
KC		 2505#if defined(__arm__)
2506 struct utsname utsbuf;
2507#endif
c99ee51a
KC		 2508
2509 ASSERT_EQ(0, pipe(pipefd));
2510
2511 child_pid = fork();
2512 ASSERT_LE(0, child_pid);
2513 if (child_pid == 0) {
2514 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2515 char buf = ' ';
256d0afb 2516 struct timespec timeout = { };
c99ee51a
KC		 2517
2518 /* Attach parent as tracer and stop. */
2519 EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
2520 EXPECT_EQ(0, raise(SIGSTOP));
2521
2522 EXPECT_EQ(0, close(pipefd[1]));
2523
2524 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2525 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2526 }
2527
2528 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2529 EXPECT_EQ(0, ret) {
2530 TH_LOG("Failed to install filter!");
2531 }
2532
2533 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2534 TH_LOG("Failed to read() sync from parent");
2535 }
2536 EXPECT_EQ('.', buf) {
2537 TH_LOG("Failed to get sync data from read()");
2538 }
2539
256d0afb
KC		 2540 /* Start nanosleep to be interrupted. */
2541 timeout.tv_sec = 1;
c99ee51a 2542 errno = 0;
256d0afb
KC		 2543 EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
2544 TH_LOG("Call to nanosleep() failed (errno %d)", errno);
c99ee51a
KC		 2545 }
2546
2547 /* Read final sync from parent. */
2548 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2549 TH_LOG("Failed final read() from parent");
2550 }
2551 EXPECT_EQ('!', buf) {
2552 TH_LOG("Failed to get final data from read()");
2553 }
2554
2555 /* Directly report the status of our test harness results. */
2556 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
2557 : EXIT_FAILURE);
2558 }
2559 EXPECT_EQ(0, close(pipefd[0]));
2560
2561 /* Attach to child, setup options, and release. */
2562 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2563 ASSERT_EQ(true, WIFSTOPPED(status));
2564 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
2565 PTRACE_O_TRACESECCOMP));
2566 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2567 ASSERT_EQ(1, write(pipefd[1], ".", 1));
2568
256d0afb 2569 /* Wait for nanosleep() to start. */
c99ee51a
KC		 2570 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2571 ASSERT_EQ(true, WIFSTOPPED(status));
2572 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2573 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2574 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2575 ASSERT_EQ(0x100, msg);
256d0afb 2576 EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid));
c99ee51a
KC		 2577
2578 /* Might as well check siginfo for sanity while we're here. */
2579 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2580 ASSERT_EQ(SIGTRAP, info.si_signo);
2581 ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
2582 EXPECT_EQ(0, info.si_errno);
2583 EXPECT_EQ(getuid(), info.si_uid);
2584 /* Verify signal delivery came from child (seccomp-triggered). */
2585 EXPECT_EQ(child_pid, info.si_pid);
2586
256d0afb 2587 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
c99ee51a
KC		 2588 ASSERT_EQ(0, kill(child_pid, SIGSTOP));
2589 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2590 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2591 ASSERT_EQ(true, WIFSTOPPED(status));
2592 ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
2593 /* Verify signal delivery came from parent now. */
2594 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2595 EXPECT_EQ(getpid(), info.si_pid);
2596
256d0afb 2597 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
c99ee51a
KC		 2598 ASSERT_EQ(0, kill(child_pid, SIGCONT));
2599 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2600 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2601 ASSERT_EQ(true, WIFSTOPPED(status));
2602 ASSERT_EQ(SIGCONT, WSTOPSIG(status));
2603 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2604
2605 /* Wait for restart_syscall() to start. */
2606 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2607 ASSERT_EQ(true, WIFSTOPPED(status));
2608 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2609 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2610 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
256d0afb 2611
c99ee51a
KC		 2612 ASSERT_EQ(0x200, msg);
2613 ret = get_syscall(_metadata, child_pid);
2614#if defined(__arm__)
256d0afb
KC		 2615 /*
2616 * FIXME:
2617 * - native ARM registers do NOT expose true syscall.
2618 * - compat ARM registers on ARM64 DO expose true syscall.
2619 */
2620 ASSERT_EQ(0, uname(&utsbuf));
2621 if (strncmp(utsbuf.machine, "arm", 3) == 0) {
2622 EXPECT_EQ(__NR_nanosleep, ret);
2623 } else
c99ee51a 2624#endif
256d0afb
KC		 2625 {
2626 EXPECT_EQ(__NR_restart_syscall, ret);
2627 }
c99ee51a 2628
256d0afb 2629 /* Write again to end test. */
c99ee51a
KC		 2630 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2631 ASSERT_EQ(1, write(pipefd[1], "!", 1));
2632 EXPECT_EQ(0, close(pipefd[1]));
2633
2634 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2635 if (WIFSIGNALED(status) || WEXITSTATUS(status))
2636 _metadata->passed = 0;
2637}
2638
e66a3997
TH		 2639TEST_SIGNAL(filter_flag_log, SIGSYS)
2640{
2641 struct sock_filter allow_filter[] = {
2642 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2643 };
2644 struct sock_filter kill_filter[] = {
2645 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2646 offsetof(struct seccomp_data, nr)),
2647 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
2648 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2649 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2650 };
2651 struct sock_fprog allow_prog = {
2652 .len = (unsigned short)ARRAY_SIZE(allow_filter),
2653 .filter = allow_filter,
2654 };
2655 struct sock_fprog kill_prog = {
2656 .len = (unsigned short)ARRAY_SIZE(kill_filter),
2657 .filter = kill_filter,
2658 };
2659 long ret;
2660 pid_t parent = getppid();
2661
2662 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2663 ASSERT_EQ(0, ret);
2664
2665 /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */
2666 ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG,
2667 &allow_prog);
2668 ASSERT_NE(ENOSYS, errno) {
2669 TH_LOG("Kernel does not support seccomp syscall!");
2670 }
2671 EXPECT_NE(0, ret) {
2672 TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
2673 }
2674 EXPECT_EQ(EINVAL, errno) {
2675 TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
2676 }
2677
2678 /* Verify that a simple, permissive filter can be added with no flags */
2679 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog);
2680 EXPECT_EQ(0, ret);
2681
2682 /* See if the same filter can be added with the FILTER_FLAG_LOG flag */
2683 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
2684 &allow_prog);
2685 ASSERT_NE(EINVAL, errno) {
2686 TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
2687 }
2688 EXPECT_EQ(0, ret);
2689
2690 /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */
2691 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
2692 &kill_prog);
2693 EXPECT_EQ(0, ret);
2694
2695 EXPECT_EQ(parent, syscall(__NR_getppid));
2696 /* getpid() should never return. */
2697 EXPECT_EQ(0, syscall(__NR_getpid));
2698}
2699
d612b1fd
TH		 2700TEST(get_action_avail)
2701{
fd76875c 2702 __u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP,
d612b1fd 2703 SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE,
59f5cf44 2704 SECCOMP_RET_LOG, SECCOMP_RET_ALLOW };
d612b1fd
TH		 2705 __u32 unknown_action = 0x10000000U;
2706 int i;
2707 long ret;
2708
2709 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]);
2710 ASSERT_NE(ENOSYS, errno) {
2711 TH_LOG("Kernel does not support seccomp syscall!");
2712 }
2713 ASSERT_NE(EINVAL, errno) {
2714 TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
2715 }
2716 EXPECT_EQ(ret, 0);
2717
2718 for (i = 0; i < ARRAY_SIZE(actions); i++) {
2719 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]);
2720 EXPECT_EQ(ret, 0) {
2721 TH_LOG("Expected action (0x%X) not available!",
2722 actions[i]);
2723 }
2724 }
2725
2726 /* Check that an unknown action is handled properly (EOPNOTSUPP) */
2727 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action);
2728 EXPECT_EQ(ret, -1);
2729 EXPECT_EQ(errno, EOPNOTSUPP);
2730}
2731
c99ee51a
KC		 2732/*
2733 * TODO:
2734 * - add microbenchmarks
2735 * - expand NNP testing
2736 * - better arch-specific TRACE and TRAP handlers.
2737 * - endianness checking when appropriate
2738 * - 64-bit arg prodding
2739 * - arch value testing (x86 modes especially)
e66a3997 2740 * - verify that FILTER_FLAG_LOG filters generate log messages
59f5cf44 2741 * - verify that RET_LOG generates log messages
c99ee51a
KC		 2742 * - ...
2743 */
2744
2745TEST_HARNESS_MAIN
Linux 6.x block layer and io_uring tree(s)