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