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7
8#define _GNU_SOURCE
9#include <sys/types.h>
10
11
12
13
14
15
16#if !__GLIBC_PREREQ(2, 26)
17# include <asm/siginfo.h>
18# define __have_siginfo_t 1
19# define __have_sigval_t 1
20# define __have_sigevent_t 1
21#endif
22
23#include <errno.h>
24#include <linux/filter.h>
25#include <sys/prctl.h>
26#include <sys/ptrace.h>
27#include <sys/user.h>
28#include <linux/prctl.h>
29#include <linux/ptrace.h>
30#include <linux/seccomp.h>
31#include <pthread.h>
32#include <semaphore.h>
33#include <signal.h>
34#include <stddef.h>
35#include <stdbool.h>
36#include <string.h>
37#include <time.h>
38#include <linux/elf.h>
39#include <sys/uio.h>
40#include <sys/utsname.h>
41#include <sys/fcntl.h>
42#include <sys/mman.h>
43#include <sys/times.h>
44#include <sys/socket.h>
45#include <sys/ioctl.h>
46
47#include <unistd.h>
48#include <sys/syscall.h>
49#include <poll.h>
50
51#include "../kselftest_harness.h"
52
53#ifndef PR_SET_PTRACER
54# define PR_SET_PTRACER 0x59616d61
55#endif
56
57#ifndef PR_SET_NO_NEW_PRIVS
58#define PR_SET_NO_NEW_PRIVS 38
59#define PR_GET_NO_NEW_PRIVS 39
60#endif
61
62#ifndef PR_SECCOMP_EXT
63#define PR_SECCOMP_EXT 43
64#endif
65
66#ifndef SECCOMP_EXT_ACT
67#define SECCOMP_EXT_ACT 1
68#endif
69
70#ifndef SECCOMP_EXT_ACT_TSYNC
71#define SECCOMP_EXT_ACT_TSYNC 1
72#endif
73
74#ifndef SECCOMP_MODE_STRICT
75#define SECCOMP_MODE_STRICT 1
76#endif
77
78#ifndef SECCOMP_MODE_FILTER
79#define SECCOMP_MODE_FILTER 2
80#endif
81
82#ifndef SECCOMP_RET_ALLOW
83struct seccomp_data {
84 int nr;
85 __u32 arch;
86 __u64 instruction_pointer;
87 __u64 args[6];
88};
89#endif
90
91#ifndef SECCOMP_RET_KILL_PROCESS
92#define SECCOMP_RET_KILL_PROCESS 0x80000000U
93#define SECCOMP_RET_KILL_THREAD 0x00000000U
94#endif
95#ifndef SECCOMP_RET_KILL
96#define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
97#define SECCOMP_RET_TRAP 0x00030000U
98#define SECCOMP_RET_ERRNO 0x00050000U
99#define SECCOMP_RET_TRACE 0x7ff00000U
100#define SECCOMP_RET_ALLOW 0x7fff0000U
101#endif
102#ifndef SECCOMP_RET_LOG
103#define SECCOMP_RET_LOG 0x7ffc0000U
104#endif
105
106#ifndef __NR_seccomp
107# if defined(__i386__)
108# define __NR_seccomp 354
109# elif defined(__x86_64__)
110# define __NR_seccomp 317
111# elif defined(__arm__)
112# define __NR_seccomp 383
113# elif defined(__aarch64__)
114# define __NR_seccomp 277
115# elif defined(__hppa__)
116# define __NR_seccomp 338
117# elif defined(__powerpc__)
118# define __NR_seccomp 358
119# elif defined(__s390__)
120# define __NR_seccomp 348
121# else
122# warning "seccomp syscall number unknown for this architecture"
123# define __NR_seccomp 0xffff
124# endif
125#endif
126
127#ifndef SECCOMP_SET_MODE_STRICT
128#define SECCOMP_SET_MODE_STRICT 0
129#endif
130
131#ifndef SECCOMP_SET_MODE_FILTER
132#define SECCOMP_SET_MODE_FILTER 1
133#endif
134
135#ifndef SECCOMP_GET_ACTION_AVAIL
136#define SECCOMP_GET_ACTION_AVAIL 2
137#endif
138
139#ifndef SECCOMP_GET_NOTIF_SIZES
140#define SECCOMP_GET_NOTIF_SIZES 3
141#endif
142
143#ifndef SECCOMP_FILTER_FLAG_TSYNC
144#define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0)
145#endif
146
147#ifndef SECCOMP_FILTER_FLAG_LOG
148#define SECCOMP_FILTER_FLAG_LOG (1UL << 1)
149#endif
150
151#ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW
152#define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2)
153#endif
154
155#ifndef PTRACE_SECCOMP_GET_METADATA
156#define PTRACE_SECCOMP_GET_METADATA 0x420d
157
158struct seccomp_metadata {
159 __u64 filter_off;
160 __u64 flags;
161};
162#endif
163
164#ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER
165#define SECCOMP_FILTER_FLAG_NEW_LISTENER (1UL << 3)
166
167#define SECCOMP_RET_USER_NOTIF 0x7fc00000U
168
169#define SECCOMP_IOC_MAGIC '!'
170#define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr)
171#define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type)
172#define SECCOMP_IOW(nr, type) _IOW(SECCOMP_IOC_MAGIC, nr, type)
173#define SECCOMP_IOWR(nr, type) _IOWR(SECCOMP_IOC_MAGIC, nr, type)
174
175
176#define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
177#define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
178 struct seccomp_notif_resp)
179#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
180
181struct seccomp_notif {
182 __u64 id;
183 __u32 pid;
184 __u32 flags;
185 struct seccomp_data data;
186};
187
188struct seccomp_notif_resp {
189 __u64 id;
190 __s64 val;
191 __s32 error;
192 __u32 flags;
193};
194
195struct seccomp_notif_sizes {
196 __u16 seccomp_notif;
197 __u16 seccomp_notif_resp;
198 __u16 seccomp_data;
199};
200#endif
201
202#ifndef seccomp
203int seccomp(unsigned int op, unsigned int flags, void *args)
204{
205 errno = 0;
206 return syscall(__NR_seccomp, op, flags, args);
207}
208#endif
209
210#if __BYTE_ORDER == __LITTLE_ENDIAN
211#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
212#elif __BYTE_ORDER == __BIG_ENDIAN
213#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
214#else
215#error "wut? Unknown __BYTE_ORDER?!"
216#endif
217
218#define SIBLING_EXIT_UNKILLED 0xbadbeef
219#define SIBLING_EXIT_FAILURE 0xbadface
220#define SIBLING_EXIT_NEWPRIVS 0xbadfeed
221
222TEST(mode_strict_support)
223{
224 long ret;
225
226 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
227 ASSERT_EQ(0, ret) {
228 TH_LOG("Kernel does not support CONFIG_SECCOMP");
229 }
230 syscall(__NR_exit, 0);
231}
232
233TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
234{
235 long ret;
236
237 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
238 ASSERT_EQ(0, ret) {
239 TH_LOG("Kernel does not support CONFIG_SECCOMP");
240 }
241 syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
242 NULL, NULL, NULL);
243 EXPECT_FALSE(true) {
244 TH_LOG("Unreachable!");
245 }
246}
247
248
249TEST(no_new_privs_support)
250{
251 long ret;
252
253 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
254 EXPECT_EQ(0, ret) {
255 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
256 }
257}
258
259
260TEST(mode_filter_support)
261{
262 long ret;
263
264 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
265 ASSERT_EQ(0, ret) {
266 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
267 }
268 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL);
269 EXPECT_EQ(-1, ret);
270 EXPECT_EQ(EFAULT, errno) {
271 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
272 }
273}
274
275TEST(mode_filter_without_nnp)
276{
277 struct sock_filter filter[] = {
278 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
279 };
280 struct sock_fprog prog = {
281 .len = (unsigned short)ARRAY_SIZE(filter),
282 .filter = filter,
283 };
284 long ret;
285
286 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
287 ASSERT_LE(0, ret) {
288 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
289 }
290 errno = 0;
291 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
292
293
294 if (geteuid()) {
295 EXPECT_EQ(-1, ret);
296 EXPECT_EQ(EACCES, errno);
297 } else {
298 EXPECT_EQ(0, ret);
299 }
300}
301
302#define MAX_INSNS_PER_PATH 32768
303
304TEST(filter_size_limits)
305{
306 int i;
307 int count = BPF_MAXINSNS + 1;
308 struct sock_filter allow[] = {
309 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
310 };
311 struct sock_filter *filter;
312 struct sock_fprog prog = { };
313 long ret;
314
315 filter = calloc(count, sizeof(*filter));
316 ASSERT_NE(NULL, filter);
317
318 for (i = 0; i < count; i++)
319 filter[i] = allow[0];
320
321 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
322 ASSERT_EQ(0, ret);
323
324 prog.filter = filter;
325 prog.len = count;
326
327
328 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
329 ASSERT_NE(0, ret) {
330 TH_LOG("Installing %d insn filter was allowed", prog.len);
331 }
332
333
334 prog.len -= 1;
335 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
336 ASSERT_EQ(0, ret) {
337 TH_LOG("Installing %d insn filter wasn't allowed", prog.len);
338 }
339}
340
341TEST(filter_chain_limits)
342{
343 int i;
344 int count = BPF_MAXINSNS;
345 struct sock_filter allow[] = {
346 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
347 };
348 struct sock_filter *filter;
349 struct sock_fprog prog = { };
350 long ret;
351
352 filter = calloc(count, sizeof(*filter));
353 ASSERT_NE(NULL, filter);
354
355 for (i = 0; i < count; i++)
356 filter[i] = allow[0];
357
358 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
359 ASSERT_EQ(0, ret);
360
361 prog.filter = filter;
362 prog.len = 1;
363
364 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
365 ASSERT_EQ(0, ret);
366
367 prog.len = count;
368
369
370 for (i = 0; i < MAX_INSNS_PER_PATH; i++) {
371 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
372 if (ret != 0)
373 break;
374 }
375 ASSERT_NE(0, ret) {
376 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
377 i, count, i * (count + 4));
378 }
379}
380
381TEST(mode_filter_cannot_move_to_strict)
382{
383 struct sock_filter filter[] = {
384 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
385 };
386 struct sock_fprog prog = {
387 .len = (unsigned short)ARRAY_SIZE(filter),
388 .filter = filter,
389 };
390 long ret;
391
392 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
393 ASSERT_EQ(0, ret);
394
395 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
396 ASSERT_EQ(0, ret);
397
398 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0);
399 EXPECT_EQ(-1, ret);
400 EXPECT_EQ(EINVAL, errno);
401}
402
403
404TEST(mode_filter_get_seccomp)
405{
406 struct sock_filter filter[] = {
407 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
408 };
409 struct sock_fprog prog = {
410 .len = (unsigned short)ARRAY_SIZE(filter),
411 .filter = filter,
412 };
413 long ret;
414
415 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
416 ASSERT_EQ(0, ret);
417
418 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
419 EXPECT_EQ(0, ret);
420
421 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
422 ASSERT_EQ(0, ret);
423
424 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
425 EXPECT_EQ(2, ret);
426}
427
428
429TEST(ALLOW_all)
430{
431 struct sock_filter filter[] = {
432 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
433 };
434 struct sock_fprog prog = {
435 .len = (unsigned short)ARRAY_SIZE(filter),
436 .filter = filter,
437 };
438 long ret;
439
440 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
441 ASSERT_EQ(0, ret);
442
443 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
444 ASSERT_EQ(0, ret);
445}
446
447TEST(empty_prog)
448{
449 struct sock_filter filter[] = {
450 };
451 struct sock_fprog prog = {
452 .len = (unsigned short)ARRAY_SIZE(filter),
453 .filter = filter,
454 };
455 long ret;
456
457 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
458 ASSERT_EQ(0, ret);
459
460 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
461 EXPECT_EQ(-1, ret);
462 EXPECT_EQ(EINVAL, errno);
463}
464
465TEST(log_all)
466{
467 struct sock_filter filter[] = {
468 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
469 };
470 struct sock_fprog prog = {
471 .len = (unsigned short)ARRAY_SIZE(filter),
472 .filter = filter,
473 };
474 long ret;
475 pid_t parent = getppid();
476
477 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
478 ASSERT_EQ(0, ret);
479
480 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
481 ASSERT_EQ(0, ret);
482
483
484 EXPECT_EQ(parent, syscall(__NR_getppid));
485}
486
487TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS)
488{
489 struct sock_filter filter[] = {
490 BPF_STMT(BPF_RET|BPF_K, 0x10000000U),
491 };
492 struct sock_fprog prog = {
493 .len = (unsigned short)ARRAY_SIZE(filter),
494 .filter = filter,
495 };
496 long ret;
497
498 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
499 ASSERT_EQ(0, ret);
500
501 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
502 ASSERT_EQ(0, ret);
503 EXPECT_EQ(0, syscall(__NR_getpid)) {
504 TH_LOG("getpid() shouldn't ever return");
505 }
506}
507
508
509TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS)
510{
511 struct sock_filter filter[] = {
512 BPF_STMT(BPF_RET|BPF_K, 0x90000000U),
513 };
514 struct sock_fprog prog = {
515 .len = (unsigned short)ARRAY_SIZE(filter),
516 .filter = filter,
517 };
518 long ret;
519
520 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
521 ASSERT_EQ(0, ret);
522
523 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
524 ASSERT_EQ(0, ret);
525 EXPECT_EQ(0, syscall(__NR_getpid)) {
526 TH_LOG("getpid() shouldn't ever return");
527 }
528}
529
530TEST_SIGNAL(KILL_all, SIGSYS)
531{
532 struct sock_filter filter[] = {
533 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
534 };
535 struct sock_fprog prog = {
536 .len = (unsigned short)ARRAY_SIZE(filter),
537 .filter = filter,
538 };
539 long ret;
540
541 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
542 ASSERT_EQ(0, ret);
543
544 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
545 ASSERT_EQ(0, ret);
546}
547
548TEST_SIGNAL(KILL_one, SIGSYS)
549{
550 struct sock_filter filter[] = {
551 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
552 offsetof(struct seccomp_data, nr)),
553 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
554 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
555 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
556 };
557 struct sock_fprog prog = {
558 .len = (unsigned short)ARRAY_SIZE(filter),
559 .filter = filter,
560 };
561 long ret;
562 pid_t parent = getppid();
563
564 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
565 ASSERT_EQ(0, ret);
566
567 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
568 ASSERT_EQ(0, ret);
569
570 EXPECT_EQ(parent, syscall(__NR_getppid));
571
572 EXPECT_EQ(0, syscall(__NR_getpid));
573}
574
575TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
576{
577 void *fatal_address;
578 struct sock_filter filter[] = {
579 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
580 offsetof(struct seccomp_data, nr)),
581 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
582 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
583
584 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
585 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
586 (unsigned long)&fatal_address, 0, 1),
587 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
588 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
589 };
590 struct sock_fprog prog = {
591 .len = (unsigned short)ARRAY_SIZE(filter),
592 .filter = filter,
593 };
594 long ret;
595 pid_t parent = getppid();
596 struct tms timebuf;
597 clock_t clock = times(&timebuf);
598
599 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
600 ASSERT_EQ(0, ret);
601
602 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
603 ASSERT_EQ(0, ret);
604
605 EXPECT_EQ(parent, syscall(__NR_getppid));
606 EXPECT_LE(clock, syscall(__NR_times, &timebuf));
607
608 EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
609}
610
611TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
612{
613#ifndef __NR_mmap2
614 int sysno = __NR_mmap;
615#else
616 int sysno = __NR_mmap2;
617#endif
618 struct sock_filter filter[] = {
619 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
620 offsetof(struct seccomp_data, nr)),
621 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
622 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
623
624 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
625 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
626 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
627 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
628 };
629 struct sock_fprog prog = {
630 .len = (unsigned short)ARRAY_SIZE(filter),
631 .filter = filter,
632 };
633 long ret;
634 pid_t parent = getppid();
635 int fd;
636 void *map1, *map2;
637 int page_size = sysconf(_SC_PAGESIZE);
638
639 ASSERT_LT(0, page_size);
640
641 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
642 ASSERT_EQ(0, ret);
643
644 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
645 ASSERT_EQ(0, ret);
646
647 fd = open("/dev/zero", O_RDONLY);
648 ASSERT_NE(-1, fd);
649
650 EXPECT_EQ(parent, syscall(__NR_getppid));
651 map1 = (void *)syscall(sysno,
652 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
653 EXPECT_NE(MAP_FAILED, map1);
654
655 map2 = (void *)syscall(sysno,
656 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
657 EXPECT_EQ(MAP_FAILED, map2);
658
659
660 munmap(map1, page_size);
661 munmap(map2, page_size);
662 close(fd);
663}
664
665
666void *kill_thread(void *data)
667{
668 bool die = (bool)data;
669
670 if (die) {
671 prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
672 return (void *)SIBLING_EXIT_FAILURE;
673 }
674
675 return (void *)SIBLING_EXIT_UNKILLED;
676}
677
678
679void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process)
680{
681 pthread_t thread;
682 void *status;
683
684 struct sock_filter filter_thread[] = {
685 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
686 offsetof(struct seccomp_data, nr)),
687 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
688 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD),
689 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
690 };
691 struct sock_fprog prog_thread = {
692 .len = (unsigned short)ARRAY_SIZE(filter_thread),
693 .filter = filter_thread,
694 };
695 struct sock_filter filter_process[] = {
696 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
697 offsetof(struct seccomp_data, nr)),
698 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
699 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS),
700 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
701 };
702 struct sock_fprog prog_process = {
703 .len = (unsigned short)ARRAY_SIZE(filter_process),
704 .filter = filter_process,
705 };
706
707 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
708 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
709 }
710
711 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0,
712 kill_process ? &prog_process : &prog_thread));
713
714
715
716
717
718 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread));
719
720
721 ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false));
722 ASSERT_EQ(0, pthread_join(thread, &status));
723 ASSERT_EQ(SIBLING_EXIT_UNKILLED, (unsigned long)status);
724
725
726 ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)true));
727 ASSERT_EQ(0, pthread_join(thread, &status));
728 ASSERT_NE(SIBLING_EXIT_FAILURE, (unsigned long)status);
729
730
731
732
733
734
735 exit(42);
736}
737
738TEST(KILL_thread)
739{
740 int status;
741 pid_t child_pid;
742
743 child_pid = fork();
744 ASSERT_LE(0, child_pid);
745 if (child_pid == 0) {
746 kill_thread_or_group(_metadata, false);
747 _exit(38);
748 }
749
750 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
751
752
753 ASSERT_TRUE(WIFEXITED(status));
754 ASSERT_EQ(42, WEXITSTATUS(status));
755}
756
757TEST(KILL_process)
758{
759 int status;
760 pid_t child_pid;
761
762 child_pid = fork();
763 ASSERT_LE(0, child_pid);
764 if (child_pid == 0) {
765 kill_thread_or_group(_metadata, true);
766 _exit(38);
767 }
768
769 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
770
771
772 ASSERT_TRUE(WIFSIGNALED(status));
773 ASSERT_EQ(SIGSYS, WTERMSIG(status));
774}
775
776
777TEST(arg_out_of_range)
778{
779 struct sock_filter filter[] = {
780 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
781 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
782 };
783 struct sock_fprog prog = {
784 .len = (unsigned short)ARRAY_SIZE(filter),
785 .filter = filter,
786 };
787 long ret;
788
789 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
790 ASSERT_EQ(0, ret);
791
792 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
793 EXPECT_EQ(-1, ret);
794 EXPECT_EQ(EINVAL, errno);
795}
796
797#define ERRNO_FILTER(name, errno) \
798 struct sock_filter _read_filter_##name[] = { \
799 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
800 offsetof(struct seccomp_data, nr)), \
801 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
802 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
803 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
804 }; \
805 struct sock_fprog prog_##name = { \
806 .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
807 .filter = _read_filter_##name, \
808 }
809
810
811TEST(ERRNO_valid)
812{
813 ERRNO_FILTER(valid, E2BIG);
814 long ret;
815 pid_t parent = getppid();
816
817 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
818 ASSERT_EQ(0, ret);
819
820 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid);
821 ASSERT_EQ(0, ret);
822
823 EXPECT_EQ(parent, syscall(__NR_getppid));
824 EXPECT_EQ(-1, read(0, NULL, 0));
825 EXPECT_EQ(E2BIG, errno);
826}
827
828
829TEST(ERRNO_zero)
830{
831 ERRNO_FILTER(zero, 0);
832 long ret;
833 pid_t parent = getppid();
834
835 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
836 ASSERT_EQ(0, ret);
837
838 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero);
839 ASSERT_EQ(0, ret);
840
841 EXPECT_EQ(parent, syscall(__NR_getppid));
842
843 EXPECT_EQ(0, read(0, NULL, 0));
844}
845
846
847
848
849
850
851TEST(ERRNO_capped)
852{
853 ERRNO_FILTER(capped, 4096);
854 long ret;
855 pid_t parent = getppid();
856
857 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
858 ASSERT_EQ(0, ret);
859
860 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped);
861 ASSERT_EQ(0, ret);
862
863 EXPECT_EQ(parent, syscall(__NR_getppid));
864 EXPECT_EQ(-1, read(0, NULL, 0));
865 EXPECT_EQ(4095, errno);
866}
867
868
869
870
871
872
873
874TEST(ERRNO_order)
875{
876 ERRNO_FILTER(first, 11);
877 ERRNO_FILTER(second, 13);
878 ERRNO_FILTER(third, 12);
879 long ret;
880 pid_t parent = getppid();
881
882 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
883 ASSERT_EQ(0, ret);
884
885 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first);
886 ASSERT_EQ(0, ret);
887
888 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second);
889 ASSERT_EQ(0, ret);
890
891 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third);
892 ASSERT_EQ(0, ret);
893
894 EXPECT_EQ(parent, syscall(__NR_getppid));
895 EXPECT_EQ(-1, read(0, NULL, 0));
896 EXPECT_EQ(12, errno);
897}
898
899FIXTURE_DATA(TRAP) {
900 struct sock_fprog prog;
901};
902
903FIXTURE_SETUP(TRAP)
904{
905 struct sock_filter filter[] = {
906 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
907 offsetof(struct seccomp_data, nr)),
908 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
909 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
910 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
911 };
912
913 memset(&self->prog, 0, sizeof(self->prog));
914 self->prog.filter = malloc(sizeof(filter));
915 ASSERT_NE(NULL, self->prog.filter);
916 memcpy(self->prog.filter, filter, sizeof(filter));
917 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
918}
919
920FIXTURE_TEARDOWN(TRAP)
921{
922 if (self->prog.filter)
923 free(self->prog.filter);
924}
925
926TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
927{
928 long ret;
929
930 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
931 ASSERT_EQ(0, ret);
932
933 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
934 ASSERT_EQ(0, ret);
935 syscall(__NR_getpid);
936}
937
938
939TEST_F_SIGNAL(TRAP, ign, SIGSYS)
940{
941 long ret;
942
943 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
944 ASSERT_EQ(0, ret);
945
946 signal(SIGSYS, SIG_IGN);
947
948 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
949 ASSERT_EQ(0, ret);
950 syscall(__NR_getpid);
951}
952
953static siginfo_t TRAP_info;
954static volatile int TRAP_nr;
955static void TRAP_action(int nr, siginfo_t *info, void *void_context)
956{
957 memcpy(&TRAP_info, info, sizeof(TRAP_info));
958 TRAP_nr = nr;
959}
960
961TEST_F(TRAP, handler)
962{
963 int ret, test;
964 struct sigaction act;
965 sigset_t mask;
966
967 memset(&act, 0, sizeof(act));
968 sigemptyset(&mask);
969 sigaddset(&mask, SIGSYS);
970
971 act.sa_sigaction = &TRAP_action;
972 act.sa_flags = SA_SIGINFO;
973 ret = sigaction(SIGSYS, &act, NULL);
974 ASSERT_EQ(0, ret) {
975 TH_LOG("sigaction failed");
976 }
977 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
978 ASSERT_EQ(0, ret) {
979 TH_LOG("sigprocmask failed");
980 }
981
982 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
983 ASSERT_EQ(0, ret);
984 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
985 ASSERT_EQ(0, ret);
986 TRAP_nr = 0;
987 memset(&TRAP_info, 0, sizeof(TRAP_info));
988
989
990 ret = syscall(__NR_getpid);
991
992 test = TRAP_nr;
993 EXPECT_EQ(SIGSYS, test);
994 struct local_sigsys {
995 void *_call_addr;
996 int _syscall;
997 unsigned int _arch;
998 } *sigsys = (struct local_sigsys *)
999#ifdef si_syscall
1000 &(TRAP_info.si_call_addr);
1001#else
1002 &TRAP_info.si_pid;
1003#endif
1004 EXPECT_EQ(__NR_getpid, sigsys->_syscall);
1005
1006 EXPECT_NE(0, sigsys->_arch);
1007 EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
1008}
1009
1010FIXTURE_DATA(precedence) {
1011 struct sock_fprog allow;
1012 struct sock_fprog log;
1013 struct sock_fprog trace;
1014 struct sock_fprog error;
1015 struct sock_fprog trap;
1016 struct sock_fprog kill;
1017};
1018
1019FIXTURE_SETUP(precedence)
1020{
1021 struct sock_filter allow_insns[] = {
1022 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1023 };
1024 struct sock_filter log_insns[] = {
1025 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1026 offsetof(struct seccomp_data, nr)),
1027 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1028 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1029 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
1030 };
1031 struct sock_filter trace_insns[] = {
1032 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1033 offsetof(struct seccomp_data, nr)),
1034 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1035 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1036 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
1037 };
1038 struct sock_filter error_insns[] = {
1039 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1040 offsetof(struct seccomp_data, nr)),
1041 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1042 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1043 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
1044 };
1045 struct sock_filter trap_insns[] = {
1046 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1047 offsetof(struct seccomp_data, nr)),
1048 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1049 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1050 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
1051 };
1052 struct sock_filter kill_insns[] = {
1053 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1054 offsetof(struct seccomp_data, nr)),
1055 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1056 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1057 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1058 };
1059
1060 memset(self, 0, sizeof(*self));
1061#define FILTER_ALLOC(_x) \
1062 self->_x.filter = malloc(sizeof(_x##_insns)); \
1063 ASSERT_NE(NULL, self->_x.filter); \
1064 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
1065 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
1066 FILTER_ALLOC(allow);
1067 FILTER_ALLOC(log);
1068 FILTER_ALLOC(trace);
1069 FILTER_ALLOC(error);
1070 FILTER_ALLOC(trap);
1071 FILTER_ALLOC(kill);
1072}
1073
1074FIXTURE_TEARDOWN(precedence)
1075{
1076#define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
1077 FILTER_FREE(allow);
1078 FILTER_FREE(log);
1079 FILTER_FREE(trace);
1080 FILTER_FREE(error);
1081 FILTER_FREE(trap);
1082 FILTER_FREE(kill);
1083}
1084
1085TEST_F(precedence, allow_ok)
1086{
1087 pid_t parent, res = 0;
1088 long ret;
1089
1090 parent = getppid();
1091 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1092 ASSERT_EQ(0, ret);
1093
1094 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1095 ASSERT_EQ(0, ret);
1096 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1097 ASSERT_EQ(0, ret);
1098 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1099 ASSERT_EQ(0, ret);
1100 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1101 ASSERT_EQ(0, ret);
1102 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1103 ASSERT_EQ(0, ret);
1104 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1105 ASSERT_EQ(0, ret);
1106
1107 res = syscall(__NR_getppid);
1108 EXPECT_EQ(parent, res);
1109}
1110
1111TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
1112{
1113 pid_t parent, res = 0;
1114 long ret;
1115
1116 parent = getppid();
1117 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1118 ASSERT_EQ(0, ret);
1119
1120 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1121 ASSERT_EQ(0, ret);
1122 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1123 ASSERT_EQ(0, ret);
1124 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1125 ASSERT_EQ(0, ret);
1126 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1127 ASSERT_EQ(0, ret);
1128 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1129 ASSERT_EQ(0, ret);
1130 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1131 ASSERT_EQ(0, ret);
1132
1133 res = syscall(__NR_getppid);
1134 EXPECT_EQ(parent, res);
1135
1136 res = syscall(__NR_getpid);
1137 EXPECT_EQ(0, res);
1138}
1139
1140TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
1141{
1142 pid_t parent;
1143 long ret;
1144
1145 parent = getppid();
1146 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1147 ASSERT_EQ(0, ret);
1148
1149 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1150 ASSERT_EQ(0, ret);
1151 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1152 ASSERT_EQ(0, ret);
1153 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1154 ASSERT_EQ(0, ret);
1155 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1156 ASSERT_EQ(0, ret);
1157 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1158 ASSERT_EQ(0, ret);
1159 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1160 ASSERT_EQ(0, ret);
1161
1162 EXPECT_EQ(parent, syscall(__NR_getppid));
1163
1164 EXPECT_EQ(0, syscall(__NR_getpid));
1165}
1166
1167TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
1168{
1169 pid_t parent;
1170 long ret;
1171
1172 parent = getppid();
1173 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1174 ASSERT_EQ(0, ret);
1175
1176 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1177 ASSERT_EQ(0, ret);
1178 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1179 ASSERT_EQ(0, ret);
1180 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1181 ASSERT_EQ(0, ret);
1182 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1183 ASSERT_EQ(0, ret);
1184 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1185 ASSERT_EQ(0, ret);
1186
1187 EXPECT_EQ(parent, syscall(__NR_getppid));
1188
1189 EXPECT_EQ(0, syscall(__NR_getpid));
1190}
1191
1192TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
1193{
1194 pid_t parent;
1195 long ret;
1196
1197 parent = getppid();
1198 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1199 ASSERT_EQ(0, ret);
1200
1201 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1202 ASSERT_EQ(0, ret);
1203 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1204 ASSERT_EQ(0, ret);
1205 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1206 ASSERT_EQ(0, ret);
1207 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1208 ASSERT_EQ(0, ret);
1209 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1210 ASSERT_EQ(0, ret);
1211
1212 EXPECT_EQ(parent, syscall(__NR_getppid));
1213
1214 EXPECT_EQ(0, syscall(__NR_getpid));
1215}
1216
1217TEST_F(precedence, errno_is_third)
1218{
1219 pid_t parent;
1220 long ret;
1221
1222 parent = getppid();
1223 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1224 ASSERT_EQ(0, ret);
1225
1226 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1227 ASSERT_EQ(0, ret);
1228 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1229 ASSERT_EQ(0, ret);
1230 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1231 ASSERT_EQ(0, ret);
1232 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1233 ASSERT_EQ(0, ret);
1234
1235 EXPECT_EQ(parent, syscall(__NR_getppid));
1236 EXPECT_EQ(0, syscall(__NR_getpid));
1237}
1238
1239TEST_F(precedence, errno_is_third_in_any_order)
1240{
1241 pid_t parent;
1242 long ret;
1243
1244 parent = getppid();
1245 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1246 ASSERT_EQ(0, ret);
1247
1248 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1249 ASSERT_EQ(0, ret);
1250 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1251 ASSERT_EQ(0, ret);
1252 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1253 ASSERT_EQ(0, ret);
1254 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1255 ASSERT_EQ(0, ret);
1256
1257 EXPECT_EQ(parent, syscall(__NR_getppid));
1258 EXPECT_EQ(0, syscall(__NR_getpid));
1259}
1260
1261TEST_F(precedence, trace_is_fourth)
1262{
1263 pid_t parent;
1264 long ret;
1265
1266 parent = getppid();
1267 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1268 ASSERT_EQ(0, ret);
1269
1270 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1271 ASSERT_EQ(0, ret);
1272 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1273 ASSERT_EQ(0, ret);
1274 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1275 ASSERT_EQ(0, ret);
1276
1277 EXPECT_EQ(parent, syscall(__NR_getppid));
1278
1279 EXPECT_EQ(-1, syscall(__NR_getpid));
1280}
1281
1282TEST_F(precedence, trace_is_fourth_in_any_order)
1283{
1284 pid_t parent;
1285 long ret;
1286
1287 parent = getppid();
1288 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1289 ASSERT_EQ(0, ret);
1290
1291 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1292 ASSERT_EQ(0, ret);
1293 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1294 ASSERT_EQ(0, ret);
1295 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1296 ASSERT_EQ(0, ret);
1297
1298 EXPECT_EQ(parent, syscall(__NR_getppid));
1299
1300 EXPECT_EQ(-1, syscall(__NR_getpid));
1301}
1302
1303TEST_F(precedence, log_is_fifth)
1304{
1305 pid_t mypid, parent;
1306 long ret;
1307
1308 mypid = getpid();
1309 parent = getppid();
1310 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1311 ASSERT_EQ(0, ret);
1312
1313 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1314 ASSERT_EQ(0, ret);
1315 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1316 ASSERT_EQ(0, ret);
1317
1318 EXPECT_EQ(parent, syscall(__NR_getppid));
1319
1320 EXPECT_EQ(mypid, syscall(__NR_getpid));
1321}
1322
1323TEST_F(precedence, log_is_fifth_in_any_order)
1324{
1325 pid_t mypid, parent;
1326 long ret;
1327
1328 mypid = getpid();
1329 parent = getppid();
1330 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1331 ASSERT_EQ(0, ret);
1332
1333 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1334 ASSERT_EQ(0, ret);
1335 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1336 ASSERT_EQ(0, ret);
1337
1338 EXPECT_EQ(parent, syscall(__NR_getppid));
1339
1340 EXPECT_EQ(mypid, syscall(__NR_getpid));
1341}
1342
1343#ifndef PTRACE_O_TRACESECCOMP
1344#define PTRACE_O_TRACESECCOMP 0x00000080
1345#endif
1346
1347
1348#if PTRACE_EVENT_SECCOMP != 7
1349#undef PTRACE_EVENT_SECCOMP
1350#endif
1351
1352#ifndef PTRACE_EVENT_SECCOMP
1353#define PTRACE_EVENT_SECCOMP 7
1354#endif
1355
1356#define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1357bool tracer_running;
1358void tracer_stop(int sig)
1359{
1360 tracer_running = false;
1361}
1362
1363typedef void tracer_func_t(struct __test_metadata *_metadata,
1364 pid_t tracee, int status, void *args);
1365
1366void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
1367 tracer_func_t tracer_func, void *args, bool ptrace_syscall)
1368{
1369 int ret = -1;
1370 struct sigaction action = {
1371 .sa_handler = tracer_stop,
1372 };
1373
1374
1375 tracer_running = true;
1376 ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
1377
1378 errno = 0;
1379 while (ret == -1 && errno != EINVAL)
1380 ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
1381 ASSERT_EQ(0, ret) {
1382 kill(tracee, SIGKILL);
1383 }
1384
1385 wait(NULL);
1386
1387 ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?
1388 PTRACE_O_TRACESYSGOOD :
1389 PTRACE_O_TRACESECCOMP);
1390 ASSERT_EQ(0, ret) {
1391 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1392 kill(tracee, SIGKILL);
1393 }
1394 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1395 tracee, NULL, 0);
1396 ASSERT_EQ(0, ret);
1397
1398
1399 ASSERT_EQ(1, write(fd, "A", 1));
1400 ASSERT_EQ(0, close(fd));
1401
1402
1403 while (tracer_running) {
1404 int status;
1405
1406 if (wait(&status) != tracee)
1407 continue;
1408 if (WIFSIGNALED(status) || WIFEXITED(status))
1409
1410 return;
1411
1412
1413 ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status));
1414
1415 tracer_func(_metadata, tracee, status, args);
1416
1417 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1418 tracee, NULL, 0);
1419 ASSERT_EQ(0, ret);
1420 }
1421
1422 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
1423}
1424
1425
1426void cont_handler(int num)
1427{ }
1428pid_t setup_trace_fixture(struct __test_metadata *_metadata,
1429 tracer_func_t func, void *args, bool ptrace_syscall)
1430{
1431 char sync;
1432 int pipefd[2];
1433 pid_t tracer_pid;
1434 pid_t tracee = getpid();
1435
1436
1437 ASSERT_EQ(0, pipe(pipefd));
1438
1439
1440 tracer_pid = fork();
1441 ASSERT_LE(0, tracer_pid);
1442 signal(SIGALRM, cont_handler);
1443 if (tracer_pid == 0) {
1444 close(pipefd[0]);
1445 start_tracer(_metadata, pipefd[1], tracee, func, args,
1446 ptrace_syscall);
1447 syscall(__NR_exit, 0);
1448 }
1449 close(pipefd[1]);
1450 prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
1451 read(pipefd[0], &sync, 1);
1452 close(pipefd[0]);
1453
1454 return tracer_pid;
1455}
1456void teardown_trace_fixture(struct __test_metadata *_metadata,
1457 pid_t tracer)
1458{
1459 if (tracer) {
1460 int status;
1461
1462
1463
1464
1465 ASSERT_EQ(0, kill(tracer, SIGUSR1));
1466 ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
1467 if (WEXITSTATUS(status))
1468 _metadata->passed = 0;
1469 }
1470}
1471
1472
1473struct tracer_args_poke_t {
1474 unsigned long poke_addr;
1475};
1476
1477void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
1478 void *args)
1479{
1480 int ret;
1481 unsigned long msg;
1482 struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
1483
1484 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1485 EXPECT_EQ(0, ret);
1486
1487 ASSERT_EQ(0x1001, msg) {
1488 kill(tracee, SIGKILL);
1489 }
1490
1491
1492
1493
1494
1495 ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
1496 EXPECT_EQ(0, ret);
1497}
1498
1499FIXTURE_DATA(TRACE_poke) {
1500 struct sock_fprog prog;
1501 pid_t tracer;
1502 long poked;
1503 struct tracer_args_poke_t tracer_args;
1504};
1505
1506FIXTURE_SETUP(TRACE_poke)
1507{
1508 struct sock_filter filter[] = {
1509 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1510 offsetof(struct seccomp_data, nr)),
1511 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1512 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
1513 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1514 };
1515
1516 self->poked = 0;
1517 memset(&self->prog, 0, sizeof(self->prog));
1518 self->prog.filter = malloc(sizeof(filter));
1519 ASSERT_NE(NULL, self->prog.filter);
1520 memcpy(self->prog.filter, filter, sizeof(filter));
1521 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1522
1523
1524 self->tracer_args.poke_addr = (unsigned long)&self->poked;
1525
1526
1527 self->tracer = setup_trace_fixture(_metadata, tracer_poke,
1528 &self->tracer_args, false);
1529}
1530
1531FIXTURE_TEARDOWN(TRACE_poke)
1532{
1533 teardown_trace_fixture(_metadata, self->tracer);
1534 if (self->prog.filter)
1535 free(self->prog.filter);
1536}
1537
1538TEST_F(TRACE_poke, read_has_side_effects)
1539{
1540 ssize_t ret;
1541
1542 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1543 ASSERT_EQ(0, ret);
1544
1545 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1546 ASSERT_EQ(0, ret);
1547
1548 EXPECT_EQ(0, self->poked);
1549 ret = read(-1, NULL, 0);
1550 EXPECT_EQ(-1, ret);
1551 EXPECT_EQ(0x1001, self->poked);
1552}
1553
1554TEST_F(TRACE_poke, getpid_runs_normally)
1555{
1556 long ret;
1557
1558 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1559 ASSERT_EQ(0, ret);
1560
1561 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1562 ASSERT_EQ(0, ret);
1563
1564 EXPECT_EQ(0, self->poked);
1565 EXPECT_NE(0, syscall(__NR_getpid));
1566 EXPECT_EQ(0, self->poked);
1567}
1568
1569#if defined(__x86_64__)
1570# define ARCH_REGS struct user_regs_struct
1571# define SYSCALL_NUM orig_rax
1572# define SYSCALL_RET rax
1573#elif defined(__i386__)
1574# define ARCH_REGS struct user_regs_struct
1575# define SYSCALL_NUM orig_eax
1576# define SYSCALL_RET eax
1577#elif defined(__arm__)
1578# define ARCH_REGS struct pt_regs
1579# define SYSCALL_NUM ARM_r7
1580# define SYSCALL_RET ARM_r0
1581#elif defined(__aarch64__)
1582# define ARCH_REGS struct user_pt_regs
1583# define SYSCALL_NUM regs[8]
1584# define SYSCALL_RET regs[0]
1585#elif defined(__hppa__)
1586# define ARCH_REGS struct user_regs_struct
1587# define SYSCALL_NUM gr[20]
1588# define SYSCALL_RET gr[28]
1589#elif defined(__powerpc__)
1590# define ARCH_REGS struct pt_regs
1591# define SYSCALL_NUM gpr[0]
1592# define SYSCALL_RET gpr[3]
1593#elif defined(__s390__)
1594# define ARCH_REGS s390_regs
1595# define SYSCALL_NUM gprs[2]
1596# define SYSCALL_RET gprs[2]
1597#elif defined(__mips__)
1598# define ARCH_REGS struct pt_regs
1599# define SYSCALL_NUM regs[2]
1600# define SYSCALL_SYSCALL_NUM regs[4]
1601# define SYSCALL_RET regs[2]
1602# define SYSCALL_NUM_RET_SHARE_REG
1603#else
1604# error "Do not know how to find your architecture's registers and syscalls"
1605#endif
1606
1607
1608#ifdef SYSCALL_NUM_RET_SHARE_REG
1609# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
1610#else
1611# define EXPECT_SYSCALL_RETURN(val, action) \
1612 do { \
1613 errno = 0; \
1614 if (val < 0) { \
1615 EXPECT_EQ(-1, action); \
1616 EXPECT_EQ(-(val), errno); \
1617 } else { \
1618 EXPECT_EQ(val, action); \
1619 } \
1620 } while (0)
1621#endif
1622
1623
1624
1625
1626#if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
1627#define HAVE_GETREGS
1628#endif
1629
1630
1631int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
1632{
1633 ARCH_REGS regs;
1634#ifdef HAVE_GETREGS
1635 EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, ®s)) {
1636 TH_LOG("PTRACE_GETREGS failed");
1637 return -1;
1638 }
1639#else
1640 struct iovec iov;
1641
1642 iov.iov_base = ®s;
1643 iov.iov_len = sizeof(regs);
1644 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
1645 TH_LOG("PTRACE_GETREGSET failed");
1646 return -1;
1647 }
1648#endif
1649
1650#if defined(__mips__)
1651 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1652 return regs.SYSCALL_SYSCALL_NUM;
1653#endif
1654 return regs.SYSCALL_NUM;
1655}
1656
1657
1658void change_syscall(struct __test_metadata *_metadata,
1659 pid_t tracee, int syscall, int result)
1660{
1661 int ret;
1662 ARCH_REGS regs;
1663#ifdef HAVE_GETREGS
1664 ret = ptrace(PTRACE_GETREGS, tracee, 0, ®s);
1665#else
1666 struct iovec iov;
1667 iov.iov_base = ®s;
1668 iov.iov_len = sizeof(regs);
1669 ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
1670#endif
1671 EXPECT_EQ(0, ret) {}
1672
1673#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1674 defined(__s390__) || defined(__hppa__)
1675 {
1676 regs.SYSCALL_NUM = syscall;
1677 }
1678#elif defined(__mips__)
1679 {
1680 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1681 regs.SYSCALL_SYSCALL_NUM = syscall;
1682 else
1683 regs.SYSCALL_NUM = syscall;
1684 }
1685
1686#elif defined(__arm__)
1687# ifndef PTRACE_SET_SYSCALL
1688# define PTRACE_SET_SYSCALL 23
1689# endif
1690 {
1691 ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
1692 EXPECT_EQ(0, ret);
1693 }
1694
1695#elif defined(__aarch64__)
1696# ifndef NT_ARM_SYSTEM_CALL
1697# define NT_ARM_SYSTEM_CALL 0x404
1698# endif
1699 {
1700 iov.iov_base = &syscall;
1701 iov.iov_len = sizeof(syscall);
1702 ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
1703 &iov);
1704 EXPECT_EQ(0, ret);
1705 }
1706
1707#else
1708 ASSERT_EQ(1, 0) {
1709 TH_LOG("How is the syscall changed on this architecture?");
1710 }
1711#endif
1712
1713
1714 if (syscall == -1)
1715#ifdef SYSCALL_NUM_RET_SHARE_REG
1716 TH_LOG("Can't modify syscall return on this architecture");
1717#else
1718 regs.SYSCALL_RET = result;
1719#endif
1720
1721#ifdef HAVE_GETREGS
1722 ret = ptrace(PTRACE_SETREGS, tracee, 0, ®s);
1723#else
1724 iov.iov_base = ®s;
1725 iov.iov_len = sizeof(regs);
1726 ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
1727#endif
1728 EXPECT_EQ(0, ret);
1729}
1730
1731void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
1732 int status, void *args)
1733{
1734 int ret;
1735 unsigned long msg;
1736
1737
1738 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1739 EXPECT_EQ(0, ret);
1740
1741
1742 switch (msg) {
1743 case 0x1002:
1744
1745 EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
1746 change_syscall(_metadata, tracee, __NR_getppid, 0);
1747 break;
1748 case 0x1003:
1749
1750 EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
1751 change_syscall(_metadata, tracee, -1, 45000);
1752 break;
1753 case 0x1004:
1754
1755 EXPECT_EQ(__NR_openat, get_syscall(_metadata, tracee));
1756 change_syscall(_metadata, tracee, -1, -ESRCH);
1757 break;
1758 case 0x1005:
1759
1760 EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
1761 break;
1762 default:
1763 EXPECT_EQ(0, msg) {
1764 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
1765 kill(tracee, SIGKILL);
1766 }
1767 }
1768
1769}
1770
1771void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
1772 int status, void *args)
1773{
1774 int ret, nr;
1775 unsigned long msg;
1776 static bool entry;
1777
1778
1779
1780
1781
1782 entry = !entry;
1783
1784
1785 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1786 EXPECT_EQ(0, ret);
1787 EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
1788 : PTRACE_EVENTMSG_SYSCALL_EXIT, msg);
1789
1790 if (!entry)
1791 return;
1792
1793 nr = get_syscall(_metadata, tracee);
1794
1795 if (nr == __NR_getpid)
1796 change_syscall(_metadata, tracee, __NR_getppid, 0);
1797 if (nr == __NR_gettid)
1798 change_syscall(_metadata, tracee, -1, 45000);
1799 if (nr == __NR_openat)
1800 change_syscall(_metadata, tracee, -1, -ESRCH);
1801}
1802
1803FIXTURE_DATA(TRACE_syscall) {
1804 struct sock_fprog prog;
1805 pid_t tracer, mytid, mypid, parent;
1806};
1807
1808FIXTURE_SETUP(TRACE_syscall)
1809{
1810 struct sock_filter filter[] = {
1811 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1812 offsetof(struct seccomp_data, nr)),
1813 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1814 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
1815 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
1816 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
1817 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_openat, 0, 1),
1818 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
1819 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1820 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1005),
1821 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1822 };
1823
1824 memset(&self->prog, 0, sizeof(self->prog));
1825 self->prog.filter = malloc(sizeof(filter));
1826 ASSERT_NE(NULL, self->prog.filter);
1827 memcpy(self->prog.filter, filter, sizeof(filter));
1828 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1829
1830
1831 self->mytid = syscall(__NR_gettid);
1832 ASSERT_GT(self->mytid, 0);
1833 ASSERT_NE(self->mytid, 1) {
1834 TH_LOG("Running this test as init is not supported. :)");
1835 }
1836
1837 self->mypid = getpid();
1838 ASSERT_GT(self->mypid, 0);
1839 ASSERT_EQ(self->mytid, self->mypid);
1840
1841 self->parent = getppid();
1842 ASSERT_GT(self->parent, 0);
1843 ASSERT_NE(self->parent, self->mypid);
1844
1845
1846 self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL,
1847 false);
1848}
1849
1850FIXTURE_TEARDOWN(TRACE_syscall)
1851{
1852 teardown_trace_fixture(_metadata, self->tracer);
1853 if (self->prog.filter)
1854 free(self->prog.filter);
1855}
1856
1857TEST_F(TRACE_syscall, ptrace_syscall_redirected)
1858{
1859
1860 teardown_trace_fixture(_metadata, self->tracer);
1861 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1862 true);
1863
1864
1865 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1866}
1867
1868TEST_F(TRACE_syscall, ptrace_syscall_errno)
1869{
1870
1871 teardown_trace_fixture(_metadata, self->tracer);
1872 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1873 true);
1874
1875
1876 EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
1877}
1878
1879TEST_F(TRACE_syscall, ptrace_syscall_faked)
1880{
1881
1882 teardown_trace_fixture(_metadata, self->tracer);
1883 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1884 true);
1885
1886
1887 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
1888}
1889
1890TEST_F(TRACE_syscall, syscall_allowed)
1891{
1892 long ret;
1893
1894 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1895 ASSERT_EQ(0, ret);
1896
1897 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1898 ASSERT_EQ(0, ret);
1899
1900
1901 EXPECT_EQ(self->parent, syscall(__NR_getppid));
1902 EXPECT_NE(self->mypid, syscall(__NR_getppid));
1903}
1904
1905TEST_F(TRACE_syscall, syscall_redirected)
1906{
1907 long ret;
1908
1909 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1910 ASSERT_EQ(0, ret);
1911
1912 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1913 ASSERT_EQ(0, ret);
1914
1915
1916 EXPECT_EQ(self->parent, syscall(__NR_getpid));
1917 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1918}
1919
1920TEST_F(TRACE_syscall, syscall_errno)
1921{
1922 long ret;
1923
1924 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1925 ASSERT_EQ(0, ret);
1926
1927 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1928 ASSERT_EQ(0, ret);
1929
1930
1931 EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
1932}
1933
1934TEST_F(TRACE_syscall, syscall_faked)
1935{
1936 long ret;
1937
1938 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1939 ASSERT_EQ(0, ret);
1940
1941 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1942 ASSERT_EQ(0, ret);
1943
1944
1945 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
1946}
1947
1948TEST_F(TRACE_syscall, skip_after_RET_TRACE)
1949{
1950 struct sock_filter filter[] = {
1951 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1952 offsetof(struct seccomp_data, nr)),
1953 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1954 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
1955 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1956 };
1957 struct sock_fprog prog = {
1958 .len = (unsigned short)ARRAY_SIZE(filter),
1959 .filter = filter,
1960 };
1961 long ret;
1962
1963 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1964 ASSERT_EQ(0, ret);
1965
1966
1967 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1968 ASSERT_EQ(0, ret);
1969
1970
1971 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
1972 ASSERT_EQ(0, ret);
1973
1974
1975 errno = 0;
1976 EXPECT_EQ(-1, syscall(__NR_getpid));
1977 EXPECT_EQ(EPERM, errno);
1978}
1979
1980TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
1981{
1982 struct sock_filter filter[] = {
1983 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1984 offsetof(struct seccomp_data, nr)),
1985 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1986 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1987 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1988 };
1989 struct sock_fprog prog = {
1990 .len = (unsigned short)ARRAY_SIZE(filter),
1991 .filter = filter,
1992 };
1993 long ret;
1994
1995 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1996 ASSERT_EQ(0, ret);
1997
1998
1999 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
2000 ASSERT_EQ(0, ret);
2001
2002
2003 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2004 ASSERT_EQ(0, ret);
2005
2006
2007 EXPECT_NE(self->mypid, syscall(__NR_getpid));
2008}
2009
2010TEST_F(TRACE_syscall, skip_after_ptrace)
2011{
2012 struct sock_filter filter[] = {
2013 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2014 offsetof(struct seccomp_data, nr)),
2015 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2016 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
2017 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2018 };
2019 struct sock_fprog prog = {
2020 .len = (unsigned short)ARRAY_SIZE(filter),
2021 .filter = filter,
2022 };
2023 long ret;
2024
2025
2026 teardown_trace_fixture(_metadata, self->tracer);
2027 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
2028 true);
2029
2030 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2031 ASSERT_EQ(0, ret);
2032
2033
2034 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2035 ASSERT_EQ(0, ret);
2036
2037
2038 EXPECT_EQ(-1, syscall(__NR_getpid));
2039 EXPECT_EQ(EPERM, errno);
2040}
2041
2042TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS)
2043{
2044 struct sock_filter filter[] = {
2045 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2046 offsetof(struct seccomp_data, nr)),
2047 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2048 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2049 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2050 };
2051 struct sock_fprog prog = {
2052 .len = (unsigned short)ARRAY_SIZE(filter),
2053 .filter = filter,
2054 };
2055 long ret;
2056
2057
2058 teardown_trace_fixture(_metadata, self->tracer);
2059 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
2060 true);
2061
2062 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2063 ASSERT_EQ(0, ret);
2064
2065
2066 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2067 ASSERT_EQ(0, ret);
2068
2069
2070 EXPECT_NE(self->mypid, syscall(__NR_getpid));
2071}
2072
2073TEST(seccomp_syscall)
2074{
2075 struct sock_filter filter[] = {
2076 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2077 };
2078 struct sock_fprog prog = {
2079 .len = (unsigned short)ARRAY_SIZE(filter),
2080 .filter = filter,
2081 };
2082 long ret;
2083
2084 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2085 ASSERT_EQ(0, ret) {
2086 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2087 }
2088
2089
2090 ret = seccomp(-1, 0, &prog);
2091 ASSERT_NE(ENOSYS, errno) {
2092 TH_LOG("Kernel does not support seccomp syscall!");
2093 }
2094 EXPECT_EQ(EINVAL, errno) {
2095 TH_LOG("Did not reject crazy op value!");
2096 }
2097
2098
2099 ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
2100 EXPECT_EQ(EINVAL, errno) {
2101 TH_LOG("Did not reject mode strict with flags!");
2102 }
2103 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
2104 EXPECT_EQ(EINVAL, errno) {
2105 TH_LOG("Did not reject mode strict with uargs!");
2106 }
2107
2108
2109 ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
2110 EXPECT_EQ(EINVAL, errno) {
2111 TH_LOG("Did not reject crazy filter flags!");
2112 }
2113 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
2114 EXPECT_EQ(EFAULT, errno) {
2115 TH_LOG("Did not reject NULL filter!");
2116 }
2117
2118 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2119 EXPECT_EQ(0, errno) {
2120 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
2121 strerror(errno));
2122 }
2123}
2124
2125TEST(seccomp_syscall_mode_lock)
2126{
2127 struct sock_filter filter[] = {
2128 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2129 };
2130 struct sock_fprog prog = {
2131 .len = (unsigned short)ARRAY_SIZE(filter),
2132 .filter = filter,
2133 };
2134 long ret;
2135
2136 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2137 ASSERT_EQ(0, ret) {
2138 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2139 }
2140
2141 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2142 ASSERT_NE(ENOSYS, errno) {
2143 TH_LOG("Kernel does not support seccomp syscall!");
2144 }
2145 EXPECT_EQ(0, ret) {
2146 TH_LOG("Could not install filter!");
2147 }
2148
2149
2150 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
2151 EXPECT_EQ(EINVAL, errno) {
2152 TH_LOG("Switched to mode strict!");
2153 }
2154
2155 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
2156 EXPECT_EQ(EINVAL, errno) {
2157 TH_LOG("Switched to mode strict!");
2158 }
2159}
2160
2161
2162
2163
2164
2165
2166
2167
2168TEST(detect_seccomp_filter_flags)
2169{
2170 unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC,
2171 SECCOMP_FILTER_FLAG_LOG,
2172 SECCOMP_FILTER_FLAG_SPEC_ALLOW,
2173 SECCOMP_FILTER_FLAG_NEW_LISTENER };
2174 unsigned int exclusive[] = {
2175 SECCOMP_FILTER_FLAG_TSYNC,
2176 SECCOMP_FILTER_FLAG_NEW_LISTENER };
2177 unsigned int flag, all_flags, exclusive_mask;
2178 int i;
2179 long ret;
2180
2181
2182 for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) {
2183 int bits = 0;
2184
2185 flag = flags[i];
2186
2187 while (flag) {
2188 if (flag & 0x1)
2189 bits ++;
2190 flag >>= 1;
2191 }
2192 ASSERT_EQ(1, bits);
2193 flag = flags[i];
2194
2195 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2196 ASSERT_NE(ENOSYS, errno) {
2197 TH_LOG("Kernel does not support seccomp syscall!");
2198 }
2199 EXPECT_EQ(-1, ret);
2200 EXPECT_EQ(EFAULT, errno) {
2201 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
2202 flag);
2203 }
2204
2205 all_flags |= flag;
2206 }
2207
2208
2209
2210
2211
2212
2213 exclusive_mask = 0;
2214 for (i = 0; i < ARRAY_SIZE(exclusive); i++)
2215 exclusive_mask |= exclusive[i];
2216 for (i = 0; i < ARRAY_SIZE(exclusive); i++) {
2217 flag = all_flags & ~exclusive_mask;
2218 flag |= exclusive[i];
2219
2220 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2221 EXPECT_EQ(-1, ret);
2222 EXPECT_EQ(EFAULT, errno) {
2223 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
2224 flag);
2225 }
2226 }
2227
2228
2229 flag = -1;
2230 flag &= ~exclusive_mask;
2231 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2232 EXPECT_EQ(-1, ret);
2233 EXPECT_EQ(EINVAL, errno) {
2234 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
2235 flag);
2236 }
2237
2238
2239
2240
2241
2242 flag = flags[ARRAY_SIZE(flags) - 1] << 1;
2243 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2244 EXPECT_EQ(-1, ret);
2245 EXPECT_EQ(EINVAL, errno) {
2246 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?",
2247 flag);
2248 }
2249}
2250
2251TEST(TSYNC_first)
2252{
2253 struct sock_filter filter[] = {
2254 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2255 };
2256 struct sock_fprog prog = {
2257 .len = (unsigned short)ARRAY_SIZE(filter),
2258 .filter = filter,
2259 };
2260 long ret;
2261
2262 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2263 ASSERT_EQ(0, ret) {
2264 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2265 }
2266
2267 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2268 &prog);
2269 ASSERT_NE(ENOSYS, errno) {
2270 TH_LOG("Kernel does not support seccomp syscall!");
2271 }
2272 EXPECT_EQ(0, ret) {
2273 TH_LOG("Could not install initial filter with TSYNC!");
2274 }
2275}
2276
2277#define TSYNC_SIBLINGS 2
2278struct tsync_sibling {
2279 pthread_t tid;
2280 pid_t system_tid;
2281 sem_t *started;
2282 pthread_cond_t *cond;
2283 pthread_mutex_t *mutex;
2284 int diverge;
2285 int num_waits;
2286 struct sock_fprog *prog;
2287 struct __test_metadata *metadata;
2288};
2289
2290
2291
2292
2293
2294
2295
2296#define PTHREAD_JOIN(tid, status) \
2297 do { \
2298 int _rc = pthread_join(tid, status); \
2299 if (_rc) { \
2300 TH_LOG("pthread_join of tid %u failed: %d\n", \
2301 (unsigned int)tid, _rc); \
2302 } else { \
2303 tid = 0; \
2304 } \
2305 } while (0)
2306
2307FIXTURE_DATA(TSYNC) {
2308 struct sock_fprog root_prog, apply_prog;
2309 struct tsync_sibling sibling[TSYNC_SIBLINGS];
2310 sem_t started;
2311 pthread_cond_t cond;
2312 pthread_mutex_t mutex;
2313 int sibling_count;
2314};
2315
2316FIXTURE_SETUP(TSYNC)
2317{
2318 struct sock_filter root_filter[] = {
2319 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2320 };
2321 struct sock_filter apply_filter[] = {
2322 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2323 offsetof(struct seccomp_data, nr)),
2324 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
2325 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2326 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2327 };
2328
2329 memset(&self->root_prog, 0, sizeof(self->root_prog));
2330 memset(&self->apply_prog, 0, sizeof(self->apply_prog));
2331 memset(&self->sibling, 0, sizeof(self->sibling));
2332 self->root_prog.filter = malloc(sizeof(root_filter));
2333 ASSERT_NE(NULL, self->root_prog.filter);
2334 memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
2335 self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
2336
2337 self->apply_prog.filter = malloc(sizeof(apply_filter));
2338 ASSERT_NE(NULL, self->apply_prog.filter);
2339 memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
2340 self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
2341
2342 self->sibling_count = 0;
2343 pthread_mutex_init(&self->mutex, NULL);
2344 pthread_cond_init(&self->cond, NULL);
2345 sem_init(&self->started, 0, 0);
2346 self->sibling[0].tid = 0;
2347 self->sibling[0].cond = &self->cond;
2348 self->sibling[0].started = &self->started;
2349 self->sibling[0].mutex = &self->mutex;
2350 self->sibling[0].diverge = 0;
2351 self->sibling[0].num_waits = 1;
2352 self->sibling[0].prog = &self->root_prog;
2353 self->sibling[0].metadata = _metadata;
2354 self->sibling[1].tid = 0;
2355 self->sibling[1].cond = &self->cond;
2356 self->sibling[1].started = &self->started;
2357 self->sibling[1].mutex = &self->mutex;
2358 self->sibling[1].diverge = 0;
2359 self->sibling[1].prog = &self->root_prog;
2360 self->sibling[1].num_waits = 1;
2361 self->sibling[1].metadata = _metadata;
2362}
2363
2364FIXTURE_TEARDOWN(TSYNC)
2365{
2366 int sib = 0;
2367
2368 if (self->root_prog.filter)
2369 free(self->root_prog.filter);
2370 if (self->apply_prog.filter)
2371 free(self->apply_prog.filter);
2372
2373 for ( ; sib < self->sibling_count; ++sib) {
2374 struct tsync_sibling *s = &self->sibling[sib];
2375
2376 if (!s->tid)
2377 continue;
2378
2379
2380
2381
2382 pthread_kill(s->tid, 9);
2383 }
2384 pthread_mutex_destroy(&self->mutex);
2385 pthread_cond_destroy(&self->cond);
2386 sem_destroy(&self->started);
2387}
2388
2389void *tsync_sibling(void *data)
2390{
2391 long ret = 0;
2392 struct tsync_sibling *me = data;
2393
2394 me->system_tid = syscall(__NR_gettid);
2395
2396 pthread_mutex_lock(me->mutex);
2397 if (me->diverge) {
2398
2399 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
2400 me->prog, 0, 0);
2401 }
2402 sem_post(me->started);
2403
2404 if (ret) {
2405 pthread_mutex_unlock(me->mutex);
2406 return (void *)SIBLING_EXIT_FAILURE;
2407 }
2408 do {
2409 pthread_cond_wait(me->cond, me->mutex);
2410 me->num_waits = me->num_waits - 1;
2411 } while (me->num_waits);
2412 pthread_mutex_unlock(me->mutex);
2413
2414 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
2415 if (!ret)
2416 return (void *)SIBLING_EXIT_NEWPRIVS;
2417 read(0, NULL, 0);
2418 return (void *)SIBLING_EXIT_UNKILLED;
2419}
2420
2421void tsync_start_sibling(struct tsync_sibling *sibling)
2422{
2423 pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
2424}
2425
2426TEST_F(TSYNC, siblings_fail_prctl)
2427{
2428 long ret;
2429 void *status;
2430 struct sock_filter filter[] = {
2431 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2432 offsetof(struct seccomp_data, nr)),
2433 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
2434 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
2435 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2436 };
2437 struct sock_fprog prog = {
2438 .len = (unsigned short)ARRAY_SIZE(filter),
2439 .filter = filter,
2440 };
2441
2442 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2443 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2444 }
2445
2446
2447 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2448 ASSERT_NE(ENOSYS, errno) {
2449 TH_LOG("Kernel does not support seccomp syscall!");
2450 }
2451 ASSERT_EQ(0, ret) {
2452 TH_LOG("setting filter failed");
2453 }
2454
2455 self->sibling[0].diverge = 1;
2456 tsync_start_sibling(&self->sibling[0]);
2457 tsync_start_sibling(&self->sibling[1]);
2458
2459 while (self->sibling_count < TSYNC_SIBLINGS) {
2460 sem_wait(&self->started);
2461 self->sibling_count++;
2462 }
2463
2464
2465 pthread_mutex_lock(&self->mutex);
2466 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2467 TH_LOG("cond broadcast non-zero");
2468 }
2469 pthread_mutex_unlock(&self->mutex);
2470
2471
2472 PTHREAD_JOIN(self->sibling[0].tid, &status);
2473 EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
2474 PTHREAD_JOIN(self->sibling[1].tid, &status);
2475 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2476}
2477
2478TEST_F(TSYNC, two_siblings_with_ancestor)
2479{
2480 long ret;
2481 void *status;
2482
2483 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2484 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2485 }
2486
2487 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2488 ASSERT_NE(ENOSYS, errno) {
2489 TH_LOG("Kernel does not support seccomp syscall!");
2490 }
2491 ASSERT_EQ(0, ret) {
2492 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2493 }
2494 tsync_start_sibling(&self->sibling[0]);
2495 tsync_start_sibling(&self->sibling[1]);
2496
2497 while (self->sibling_count < TSYNC_SIBLINGS) {
2498 sem_wait(&self->started);
2499 self->sibling_count++;
2500 }
2501
2502 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2503 &self->apply_prog);
2504 ASSERT_EQ(0, ret) {
2505 TH_LOG("Could install filter on all threads!");
2506 }
2507
2508 pthread_mutex_lock(&self->mutex);
2509 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2510 TH_LOG("cond broadcast non-zero");
2511 }
2512 pthread_mutex_unlock(&self->mutex);
2513
2514 PTHREAD_JOIN(self->sibling[0].tid, &status);
2515 EXPECT_EQ(0x0, (long)status);
2516 PTHREAD_JOIN(self->sibling[1].tid, &status);
2517 EXPECT_EQ(0x0, (long)status);
2518}
2519
2520TEST_F(TSYNC, two_sibling_want_nnp)
2521{
2522 void *status;
2523
2524
2525 tsync_start_sibling(&self->sibling[0]);
2526 tsync_start_sibling(&self->sibling[1]);
2527 while (self->sibling_count < TSYNC_SIBLINGS) {
2528 sem_wait(&self->started);
2529 self->sibling_count++;
2530 }
2531
2532
2533 pthread_mutex_lock(&self->mutex);
2534 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2535 TH_LOG("cond broadcast non-zero");
2536 }
2537 pthread_mutex_unlock(&self->mutex);
2538
2539
2540 PTHREAD_JOIN(self->sibling[0].tid, &status);
2541 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
2542 PTHREAD_JOIN(self->sibling[1].tid, &status);
2543 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
2544}
2545
2546TEST_F(TSYNC, two_siblings_with_no_filter)
2547{
2548 long ret;
2549 void *status;
2550
2551
2552 tsync_start_sibling(&self->sibling[0]);
2553 tsync_start_sibling(&self->sibling[1]);
2554 while (self->sibling_count < TSYNC_SIBLINGS) {
2555 sem_wait(&self->started);
2556 self->sibling_count++;
2557 }
2558
2559 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2560 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2561 }
2562
2563 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2564 &self->apply_prog);
2565 ASSERT_NE(ENOSYS, errno) {
2566 TH_LOG("Kernel does not support seccomp syscall!");
2567 }
2568 ASSERT_EQ(0, ret) {
2569 TH_LOG("Could install filter on all threads!");
2570 }
2571
2572
2573 pthread_mutex_lock(&self->mutex);
2574 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2575 TH_LOG("cond broadcast non-zero");
2576 }
2577 pthread_mutex_unlock(&self->mutex);
2578
2579
2580 PTHREAD_JOIN(self->sibling[0].tid, &status);
2581 EXPECT_EQ(0x0, (long)status);
2582 PTHREAD_JOIN(self->sibling[1].tid, &status);
2583 EXPECT_EQ(0x0, (long)status);
2584}
2585
2586TEST_F(TSYNC, two_siblings_with_one_divergence)
2587{
2588 long ret;
2589 void *status;
2590
2591 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2592 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2593 }
2594
2595 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2596 ASSERT_NE(ENOSYS, errno) {
2597 TH_LOG("Kernel does not support seccomp syscall!");
2598 }
2599 ASSERT_EQ(0, ret) {
2600 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2601 }
2602 self->sibling[0].diverge = 1;
2603 tsync_start_sibling(&self->sibling[0]);
2604 tsync_start_sibling(&self->sibling[1]);
2605
2606 while (self->sibling_count < TSYNC_SIBLINGS) {
2607 sem_wait(&self->started);
2608 self->sibling_count++;
2609 }
2610
2611 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2612 &self->apply_prog);
2613 ASSERT_EQ(self->sibling[0].system_tid, ret) {
2614 TH_LOG("Did not fail on diverged sibling.");
2615 }
2616
2617
2618 pthread_mutex_lock(&self->mutex);
2619 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2620 TH_LOG("cond broadcast non-zero");
2621 }
2622 pthread_mutex_unlock(&self->mutex);
2623
2624
2625 PTHREAD_JOIN(self->sibling[0].tid, &status);
2626 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2627 PTHREAD_JOIN(self->sibling[1].tid, &status);
2628 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2629}
2630
2631TEST_F(TSYNC, two_siblings_not_under_filter)
2632{
2633 long ret, sib;
2634 void *status;
2635 struct timespec delay = { .tv_nsec = 100000000 };
2636
2637 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2638 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2639 }
2640
2641
2642
2643
2644
2645
2646
2647 self->sibling[0].diverge = 1;
2648 tsync_start_sibling(&self->sibling[0]);
2649 tsync_start_sibling(&self->sibling[1]);
2650
2651 while (self->sibling_count < TSYNC_SIBLINGS) {
2652 sem_wait(&self->started);
2653 self->sibling_count++;
2654 }
2655
2656 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2657 ASSERT_NE(ENOSYS, errno) {
2658 TH_LOG("Kernel does not support seccomp syscall!");
2659 }
2660 ASSERT_EQ(0, ret) {
2661 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2662 }
2663
2664 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2665 &self->apply_prog);
2666 ASSERT_EQ(ret, self->sibling[0].system_tid) {
2667 TH_LOG("Did not fail on diverged sibling.");
2668 }
2669 sib = 1;
2670 if (ret == self->sibling[0].system_tid)
2671 sib = 0;
2672
2673 pthread_mutex_lock(&self->mutex);
2674
2675
2676
2677
2678 self->sibling[!sib].num_waits += 1;
2679
2680
2681 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2682 TH_LOG("cond broadcast non-zero");
2683 }
2684 pthread_mutex_unlock(&self->mutex);
2685 PTHREAD_JOIN(self->sibling[sib].tid, &status);
2686 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2687
2688 while (!kill(self->sibling[sib].system_tid, 0))
2689 nanosleep(&delay, NULL);
2690
2691 sib = !sib;
2692
2693 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2694 &self->apply_prog);
2695 ASSERT_EQ(0, ret) {
2696 TH_LOG("Expected the remaining sibling to sync");
2697 };
2698
2699 pthread_mutex_lock(&self->mutex);
2700
2701
2702
2703
2704 if (self->sibling[sib].num_waits > 1)
2705 self->sibling[sib].num_waits = 1;
2706 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2707 TH_LOG("cond broadcast non-zero");
2708 }
2709 pthread_mutex_unlock(&self->mutex);
2710 PTHREAD_JOIN(self->sibling[sib].tid, &status);
2711 EXPECT_EQ(0, (long)status);
2712
2713 while (!kill(self->sibling[sib].system_tid, 0))
2714 nanosleep(&delay, NULL);
2715
2716 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2717 &self->apply_prog);
2718 ASSERT_EQ(0, ret);
2719}
2720
2721
2722TEST(syscall_restart)
2723{
2724 long ret;
2725 unsigned long msg;
2726 pid_t child_pid;
2727 int pipefd[2];
2728 int status;
2729 siginfo_t info = { };
2730 struct sock_filter filter[] = {
2731 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2732 offsetof(struct seccomp_data, nr)),
2733
2734#ifdef __NR_sigreturn
2735 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0),
2736#endif
2737 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0),
2738 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0),
2739 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0),
2740 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0),
2741 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
2742
2743
2744 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
2745 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2746 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2747
2748 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
2749
2750 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
2751 };
2752 struct sock_fprog prog = {
2753 .len = (unsigned short)ARRAY_SIZE(filter),
2754 .filter = filter,
2755 };
2756#if defined(__arm__)
2757 struct utsname utsbuf;
2758#endif
2759
2760 ASSERT_EQ(0, pipe(pipefd));
2761
2762 child_pid = fork();
2763 ASSERT_LE(0, child_pid);
2764 if (child_pid == 0) {
2765
2766 char buf = ' ';
2767 struct timespec timeout = { };
2768
2769
2770 EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
2771 EXPECT_EQ(0, raise(SIGSTOP));
2772
2773 EXPECT_EQ(0, close(pipefd[1]));
2774
2775 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2776 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2777 }
2778
2779 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2780 EXPECT_EQ(0, ret) {
2781 TH_LOG("Failed to install filter!");
2782 }
2783
2784 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2785 TH_LOG("Failed to read() sync from parent");
2786 }
2787 EXPECT_EQ('.', buf) {
2788 TH_LOG("Failed to get sync data from read()");
2789 }
2790
2791
2792 timeout.tv_sec = 1;
2793 errno = 0;
2794 EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
2795 TH_LOG("Call to nanosleep() failed (errno %d)", errno);
2796 }
2797
2798
2799 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2800 TH_LOG("Failed final read() from parent");
2801 }
2802 EXPECT_EQ('!', buf) {
2803 TH_LOG("Failed to get final data from read()");
2804 }
2805
2806
2807 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
2808 : EXIT_FAILURE);
2809 }
2810 EXPECT_EQ(0, close(pipefd[0]));
2811
2812
2813 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2814 ASSERT_EQ(true, WIFSTOPPED(status));
2815 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
2816 PTRACE_O_TRACESECCOMP));
2817 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2818 ASSERT_EQ(1, write(pipefd[1], ".", 1));
2819
2820
2821 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2822 ASSERT_EQ(true, WIFSTOPPED(status));
2823 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2824 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2825 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2826 ASSERT_EQ(0x100, msg);
2827 EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid));
2828
2829
2830 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2831 ASSERT_EQ(SIGTRAP, info.si_signo);
2832 ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
2833 EXPECT_EQ(0, info.si_errno);
2834 EXPECT_EQ(getuid(), info.si_uid);
2835
2836 EXPECT_EQ(child_pid, info.si_pid);
2837
2838
2839 ASSERT_EQ(0, kill(child_pid, SIGSTOP));
2840 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2841 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2842 ASSERT_EQ(true, WIFSTOPPED(status));
2843 ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
2844 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2845
2846
2847
2848
2849
2850
2851 EXPECT_EQ(SIGSTOP, info.si_signo);
2852
2853
2854 ASSERT_EQ(0, kill(child_pid, SIGCONT));
2855 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2856 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2857 ASSERT_EQ(true, WIFSTOPPED(status));
2858 ASSERT_EQ(SIGCONT, WSTOPSIG(status));
2859 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2860
2861
2862 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2863 ASSERT_EQ(true, WIFSTOPPED(status));
2864 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2865 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2866 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2867
2868 ASSERT_EQ(0x200, msg);
2869 ret = get_syscall(_metadata, child_pid);
2870#if defined(__arm__)
2871
2872
2873
2874
2875
2876 ASSERT_EQ(0, uname(&utsbuf));
2877 if (strncmp(utsbuf.machine, "arm", 3) == 0) {
2878 EXPECT_EQ(__NR_nanosleep, ret);
2879 } else
2880#endif
2881 {
2882 EXPECT_EQ(__NR_restart_syscall, ret);
2883 }
2884
2885
2886 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2887 ASSERT_EQ(1, write(pipefd[1], "!", 1));
2888 EXPECT_EQ(0, close(pipefd[1]));
2889
2890 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2891 if (WIFSIGNALED(status) || WEXITSTATUS(status))
2892 _metadata->passed = 0;
2893}
2894
2895TEST_SIGNAL(filter_flag_log, SIGSYS)
2896{
2897 struct sock_filter allow_filter[] = {
2898 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2899 };
2900 struct sock_filter kill_filter[] = {
2901 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2902 offsetof(struct seccomp_data, nr)),
2903 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
2904 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2905 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2906 };
2907 struct sock_fprog allow_prog = {
2908 .len = (unsigned short)ARRAY_SIZE(allow_filter),
2909 .filter = allow_filter,
2910 };
2911 struct sock_fprog kill_prog = {
2912 .len = (unsigned short)ARRAY_SIZE(kill_filter),
2913 .filter = kill_filter,
2914 };
2915 long ret;
2916 pid_t parent = getppid();
2917
2918 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2919 ASSERT_EQ(0, ret);
2920
2921
2922 ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG,
2923 &allow_prog);
2924 ASSERT_NE(ENOSYS, errno) {
2925 TH_LOG("Kernel does not support seccomp syscall!");
2926 }
2927 EXPECT_NE(0, ret) {
2928 TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
2929 }
2930 EXPECT_EQ(EINVAL, errno) {
2931 TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
2932 }
2933
2934
2935 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog);
2936 EXPECT_EQ(0, ret);
2937
2938
2939 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
2940 &allow_prog);
2941 ASSERT_NE(EINVAL, errno) {
2942 TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
2943 }
2944 EXPECT_EQ(0, ret);
2945
2946
2947 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
2948 &kill_prog);
2949 EXPECT_EQ(0, ret);
2950
2951 EXPECT_EQ(parent, syscall(__NR_getppid));
2952
2953 EXPECT_EQ(0, syscall(__NR_getpid));
2954}
2955
2956TEST(get_action_avail)
2957{
2958 __u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP,
2959 SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE,
2960 SECCOMP_RET_LOG, SECCOMP_RET_ALLOW };
2961 __u32 unknown_action = 0x10000000U;
2962 int i;
2963 long ret;
2964
2965 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]);
2966 ASSERT_NE(ENOSYS, errno) {
2967 TH_LOG("Kernel does not support seccomp syscall!");
2968 }
2969 ASSERT_NE(EINVAL, errno) {
2970 TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
2971 }
2972 EXPECT_EQ(ret, 0);
2973
2974 for (i = 0; i < ARRAY_SIZE(actions); i++) {
2975 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]);
2976 EXPECT_EQ(ret, 0) {
2977 TH_LOG("Expected action (0x%X) not available!",
2978 actions[i]);
2979 }
2980 }
2981
2982
2983 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action);
2984 EXPECT_EQ(ret, -1);
2985 EXPECT_EQ(errno, EOPNOTSUPP);
2986}
2987
2988TEST(get_metadata)
2989{
2990 pid_t pid;
2991 int pipefd[2];
2992 char buf;
2993 struct seccomp_metadata md;
2994 long ret;
2995
2996
2997 if (geteuid()) {
2998 XFAIL(return, "get_metadata requires real root");
2999 return;
3000 }
3001
3002 ASSERT_EQ(0, pipe(pipefd));
3003
3004 pid = fork();
3005 ASSERT_GE(pid, 0);
3006 if (pid == 0) {
3007 struct sock_filter filter[] = {
3008 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
3009 };
3010 struct sock_fprog prog = {
3011 .len = (unsigned short)ARRAY_SIZE(filter),
3012 .filter = filter,
3013 };
3014
3015
3016 EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER,
3017 SECCOMP_FILTER_FLAG_LOG, &prog));
3018 EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog));
3019
3020 EXPECT_EQ(0, close(pipefd[0]));
3021 ASSERT_EQ(1, write(pipefd[1], "1", 1));
3022 ASSERT_EQ(0, close(pipefd[1]));
3023
3024 while (1)
3025 sleep(100);
3026 }
3027
3028 ASSERT_EQ(0, close(pipefd[1]));
3029 ASSERT_EQ(1, read(pipefd[0], &buf, 1));
3030
3031 ASSERT_EQ(0, ptrace(PTRACE_ATTACH, pid));
3032 ASSERT_EQ(pid, waitpid(pid, NULL, 0));
3033
3034
3035
3036 md.filter_off = 0;
3037 errno = 0;
3038 ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
3039 EXPECT_EQ(sizeof(md), ret) {
3040 if (errno == EINVAL)
3041 XFAIL(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
3042 }
3043
3044 EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG);
3045 EXPECT_EQ(md.filter_off, 0);
3046
3047 md.filter_off = 1;
3048 ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
3049 EXPECT_EQ(sizeof(md), ret);
3050 EXPECT_EQ(md.flags, 0);
3051 EXPECT_EQ(md.filter_off, 1);
3052
3053skip:
3054 ASSERT_EQ(0, kill(pid, SIGKILL));
3055}
3056
3057static int user_trap_syscall(int nr, unsigned int flags)
3058{
3059 struct sock_filter filter[] = {
3060 BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
3061 offsetof(struct seccomp_data, nr)),
3062 BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, nr, 0, 1),
3063 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_USER_NOTIF),
3064 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
3065 };
3066
3067 struct sock_fprog prog = {
3068 .len = (unsigned short)ARRAY_SIZE(filter),
3069 .filter = filter,
3070 };
3071
3072 return seccomp(SECCOMP_SET_MODE_FILTER, flags, &prog);
3073}
3074
3075#define USER_NOTIF_MAGIC 116983961184613L
3076TEST(user_notification_basic)
3077{
3078 pid_t pid;
3079 long ret;
3080 int status, listener;
3081 struct seccomp_notif req = {};
3082 struct seccomp_notif_resp resp = {};
3083 struct pollfd pollfd;
3084
3085 struct sock_filter filter[] = {
3086 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
3087 };
3088 struct sock_fprog prog = {
3089 .len = (unsigned short)ARRAY_SIZE(filter),
3090 .filter = filter,
3091 };
3092
3093 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3094 ASSERT_EQ(0, ret) {
3095 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3096 }
3097
3098 pid = fork();
3099 ASSERT_GE(pid, 0);
3100
3101
3102 if (pid == 0) {
3103 if (user_trap_syscall(__NR_getppid, 0) < 0)
3104 exit(1);
3105 ret = syscall(__NR_getppid);
3106 exit(ret >= 0 || errno != ENOSYS);
3107 }
3108
3109 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3110 EXPECT_EQ(true, WIFEXITED(status));
3111 EXPECT_EQ(0, WEXITSTATUS(status));
3112
3113
3114 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3115 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3116 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3117 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3118
3119
3120 listener = user_trap_syscall(__NR_getppid,
3121 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3122 ASSERT_GE(listener, 0);
3123
3124
3125 EXPECT_EQ(user_trap_syscall(__NR_getppid,
3126 SECCOMP_FILTER_FLAG_NEW_LISTENER),
3127 -1);
3128 EXPECT_EQ(errno, EBUSY);
3129
3130 pid = fork();
3131 ASSERT_GE(pid, 0);
3132
3133 if (pid == 0) {
3134 ret = syscall(__NR_getppid);
3135 exit(ret != USER_NOTIF_MAGIC);
3136 }
3137
3138 pollfd.fd = listener;
3139 pollfd.events = POLLIN | POLLOUT;
3140
3141 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3142 EXPECT_EQ(pollfd.revents, POLLIN);
3143
3144 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3145
3146 pollfd.fd = listener;
3147 pollfd.events = POLLIN | POLLOUT;
3148
3149 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3150 EXPECT_EQ(pollfd.revents, POLLOUT);
3151
3152 EXPECT_EQ(req.data.nr, __NR_getppid);
3153
3154 resp.id = req.id;
3155 resp.error = 0;
3156 resp.val = USER_NOTIF_MAGIC;
3157
3158
3159 resp.flags = 1;
3160 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3161 EXPECT_EQ(errno, EINVAL);
3162
3163 resp.flags = 0;
3164 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3165
3166 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3167 EXPECT_EQ(true, WIFEXITED(status));
3168 EXPECT_EQ(0, WEXITSTATUS(status));
3169}
3170
3171TEST(user_notification_kill_in_middle)
3172{
3173 pid_t pid;
3174 long ret;
3175 int listener;
3176 struct seccomp_notif req = {};
3177 struct seccomp_notif_resp resp = {};
3178
3179 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3180 ASSERT_EQ(0, ret) {
3181 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3182 }
3183
3184 listener = user_trap_syscall(__NR_getppid,
3185 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3186 ASSERT_GE(listener, 0);
3187
3188
3189
3190
3191
3192 pid = fork();
3193 ASSERT_GE(pid, 0);
3194
3195 if (pid == 0) {
3196 ret = syscall(__NR_getppid);
3197 exit(ret != USER_NOTIF_MAGIC);
3198 }
3199
3200 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3201 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), 0);
3202
3203 EXPECT_EQ(kill(pid, SIGKILL), 0);
3204 EXPECT_EQ(waitpid(pid, NULL, 0), pid);
3205
3206 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), -1);
3207
3208 resp.id = req.id;
3209 ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp);
3210 EXPECT_EQ(ret, -1);
3211 EXPECT_EQ(errno, ENOENT);
3212}
3213
3214static int handled = -1;
3215
3216static void signal_handler(int signal)
3217{
3218 if (write(handled, "c", 1) != 1)
3219 perror("write from signal");
3220}
3221
3222TEST(user_notification_signal)
3223{
3224 pid_t pid;
3225 long ret;
3226 int status, listener, sk_pair[2];
3227 struct seccomp_notif req = {};
3228 struct seccomp_notif_resp resp = {};
3229 char c;
3230
3231 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3232 ASSERT_EQ(0, ret) {
3233 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3234 }
3235
3236 ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0);
3237
3238 listener = user_trap_syscall(__NR_gettid,
3239 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3240 ASSERT_GE(listener, 0);
3241
3242 pid = fork();
3243 ASSERT_GE(pid, 0);
3244
3245 if (pid == 0) {
3246 close(sk_pair[0]);
3247 handled = sk_pair[1];
3248 if (signal(SIGUSR1, signal_handler) == SIG_ERR) {
3249 perror("signal");
3250 exit(1);
3251 }
3252
3253
3254
3255
3256
3257
3258 ret = syscall(__NR_gettid);
3259 exit(!(ret == -1 && errno == 512));
3260 }
3261
3262 close(sk_pair[1]);
3263
3264 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3265
3266 EXPECT_EQ(kill(pid, SIGUSR1), 0);
3267
3268
3269
3270
3271
3272
3273 EXPECT_EQ(read(sk_pair[0], &c, 1), 1);
3274
3275 resp.id = req.id;
3276 resp.error = -EPERM;
3277 resp.val = 0;
3278
3279 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3280 EXPECT_EQ(errno, ENOENT);
3281
3282 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3283
3284 resp.id = req.id;
3285 resp.error = -512;
3286 resp.val = 0;
3287
3288 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3289
3290 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3291 EXPECT_EQ(true, WIFEXITED(status));
3292 EXPECT_EQ(0, WEXITSTATUS(status));
3293}
3294
3295TEST(user_notification_closed_listener)
3296{
3297 pid_t pid;
3298 long ret;
3299 int status, listener;
3300
3301 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3302 ASSERT_EQ(0, ret) {
3303 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3304 }
3305
3306 listener = user_trap_syscall(__NR_getppid,
3307 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3308 ASSERT_GE(listener, 0);
3309
3310
3311
3312
3313 pid = fork();
3314 ASSERT_GE(pid, 0);
3315 if (pid == 0) {
3316 close(listener);
3317 ret = syscall(__NR_getppid);
3318 exit(ret != -1 && errno != ENOSYS);
3319 }
3320
3321 close(listener);
3322
3323 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3324 EXPECT_EQ(true, WIFEXITED(status));
3325 EXPECT_EQ(0, WEXITSTATUS(status));
3326}
3327
3328
3329
3330
3331TEST(user_notification_child_pid_ns)
3332{
3333 pid_t pid;
3334 int status, listener;
3335 struct seccomp_notif req = {};
3336 struct seccomp_notif_resp resp = {};
3337
3338 ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0);
3339
3340 listener = user_trap_syscall(__NR_getppid,
3341 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3342 ASSERT_GE(listener, 0);
3343
3344 pid = fork();
3345 ASSERT_GE(pid, 0);
3346
3347 if (pid == 0)
3348 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3349
3350 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3351 EXPECT_EQ(req.pid, pid);
3352
3353 resp.id = req.id;
3354 resp.error = 0;
3355 resp.val = USER_NOTIF_MAGIC;
3356
3357 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3358
3359 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3360 EXPECT_EQ(true, WIFEXITED(status));
3361 EXPECT_EQ(0, WEXITSTATUS(status));
3362 close(listener);
3363}
3364
3365
3366
3367
3368
3369TEST(user_notification_sibling_pid_ns)
3370{
3371 pid_t pid, pid2;
3372 int status, listener;
3373 struct seccomp_notif req = {};
3374 struct seccomp_notif_resp resp = {};
3375
3376 ASSERT_EQ(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0), 0) {
3377 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3378 }
3379
3380 listener = user_trap_syscall(__NR_getppid,
3381 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3382 ASSERT_GE(listener, 0);
3383
3384 pid = fork();
3385 ASSERT_GE(pid, 0);
3386
3387 if (pid == 0) {
3388 ASSERT_EQ(unshare(CLONE_NEWPID), 0);
3389
3390 pid2 = fork();
3391 ASSERT_GE(pid2, 0);
3392
3393 if (pid2 == 0)
3394 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3395
3396 EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
3397 EXPECT_EQ(true, WIFEXITED(status));
3398 EXPECT_EQ(0, WEXITSTATUS(status));
3399 exit(WEXITSTATUS(status));
3400 }
3401
3402
3403 ASSERT_EQ(unshare(CLONE_NEWPID), 0);
3404 ASSERT_EQ(errno, 0);
3405
3406 pid2 = fork();
3407 ASSERT_GE(pid2, 0);
3408
3409 if (pid2 == 0) {
3410 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3411
3412
3413
3414
3415 EXPECT_EQ(req.pid, 0);
3416
3417 resp.id = req.id;
3418 resp.error = 0;
3419 resp.val = USER_NOTIF_MAGIC;
3420
3421 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3422 exit(0);
3423 }
3424
3425 close(listener);
3426
3427 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3428 EXPECT_EQ(true, WIFEXITED(status));
3429 EXPECT_EQ(0, WEXITSTATUS(status));
3430
3431 EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
3432 EXPECT_EQ(true, WIFEXITED(status));
3433 EXPECT_EQ(0, WEXITSTATUS(status));
3434}
3435
3436TEST(user_notification_fault_recv)
3437{
3438 pid_t pid;
3439 int status, listener;
3440 struct seccomp_notif req = {};
3441 struct seccomp_notif_resp resp = {};
3442
3443 ASSERT_EQ(unshare(CLONE_NEWUSER), 0);
3444
3445 listener = user_trap_syscall(__NR_getppid,
3446 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3447 ASSERT_GE(listener, 0);
3448
3449 pid = fork();
3450 ASSERT_GE(pid, 0);
3451
3452 if (pid == 0)
3453 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
3454
3455
3456 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, NULL), -1);
3457 EXPECT_EQ(errno, EFAULT);
3458
3459
3460 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3461 EXPECT_EQ(req.pid, pid);
3462
3463 resp.id = req.id;
3464 resp.error = 0;
3465 resp.val = USER_NOTIF_MAGIC;
3466
3467 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3468
3469 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3470 EXPECT_EQ(true, WIFEXITED(status));
3471 EXPECT_EQ(0, WEXITSTATUS(status));
3472}
3473
3474TEST(seccomp_get_notif_sizes)
3475{
3476 struct seccomp_notif_sizes sizes;
3477
3478 ASSERT_EQ(seccomp(SECCOMP_GET_NOTIF_SIZES, 0, &sizes), 0);
3479 EXPECT_EQ(sizes.seccomp_notif, sizeof(struct seccomp_notif));
3480 EXPECT_EQ(sizes.seccomp_notif_resp, sizeof(struct seccomp_notif_resp));
3481}
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496TEST_HARNESS_MAIN
3497