2 * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
3 * Use of this source code is governed by the GPLv2 license.
5 * Test code for seccomp bpf.
8 #include <asm/siginfo.h>
9 #define __have_siginfo_t 1
10 #define __have_sigval_t 1
11 #define __have_sigevent_t 1
14 #include <linux/filter.h>
15 #include <sys/prctl.h>
16 #include <sys/ptrace.h>
17 #include <sys/types.h>
19 #include <linux/prctl.h>
20 #include <linux/ptrace.h>
21 #include <linux/seccomp.h>
23 #include <semaphore.h>
29 #include <linux/elf.h>
31 #include <sys/utsname.h>
32 #include <sys/fcntl.h>
34 #include <sys/times.h>
38 #include <sys/syscall.h>
40 #include "test_harness.h"
42 #ifndef PR_SET_PTRACER
43 # define PR_SET_PTRACER 0x59616d61
46 #ifndef PR_SET_NO_NEW_PRIVS
47 #define PR_SET_NO_NEW_PRIVS 38
48 #define PR_GET_NO_NEW_PRIVS 39
51 #ifndef PR_SECCOMP_EXT
52 #define PR_SECCOMP_EXT 43
55 #ifndef SECCOMP_EXT_ACT
56 #define SECCOMP_EXT_ACT 1
59 #ifndef SECCOMP_EXT_ACT_TSYNC
60 #define SECCOMP_EXT_ACT_TSYNC 1
63 #ifndef SECCOMP_MODE_STRICT
64 #define SECCOMP_MODE_STRICT 1
67 #ifndef SECCOMP_MODE_FILTER
68 #define SECCOMP_MODE_FILTER 2
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 */
78 /* Masks for the return value sections. */
79 #define SECCOMP_RET_ACTION 0x7fff0000U
80 #define SECCOMP_RET_DATA 0x0000ffffU
85 __u64 instruction_pointer;
90 #if __BYTE_ORDER == __LITTLE_ENDIAN
91 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
92 #elif __BYTE_ORDER == __BIG_ENDIAN
93 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
95 #error "wut? Unknown __BYTE_ORDER?!"
98 #define SIBLING_EXIT_UNKILLED 0xbadbeef
99 #define SIBLING_EXIT_FAILURE 0xbadface
100 #define SIBLING_EXIT_NEWPRIVS 0xbadfeed
102 TEST(mode_strict_support)
106 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
108 TH_LOG("Kernel does not support CONFIG_SECCOMP");
110 syscall(__NR_exit, 1);
113 TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
117 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
119 TH_LOG("Kernel does not support CONFIG_SECCOMP");
121 syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
124 TH_LOG("Unreachable!");
128 /* Note! This doesn't test no new privs behavior */
129 TEST(no_new_privs_support)
133 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
135 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
139 /* Tests kernel support by checking for a copy_from_user() fault on * NULL. */
140 TEST(mode_filter_support)
144 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
146 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
148 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL);
150 EXPECT_EQ(EFAULT, errno) {
151 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
155 TEST(mode_filter_without_nnp)
157 struct sock_filter filter[] = {
158 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
160 struct sock_fprog prog = {
161 .len = (unsigned short)ARRAY_SIZE(filter),
166 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
168 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
171 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
172 /* Succeeds with CAP_SYS_ADMIN, fails without */
173 /* TODO(wad) check caps not euid */
176 EXPECT_EQ(EACCES, errno);
182 #define MAX_INSNS_PER_PATH 32768
184 TEST(filter_size_limits)
187 int count = BPF_MAXINSNS + 1;
188 struct sock_filter allow[] = {
189 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
191 struct sock_filter *filter;
192 struct sock_fprog prog = { };
195 filter = calloc(count, sizeof(*filter));
196 ASSERT_NE(NULL, filter);
198 for (i = 0; i < count; i++)
199 filter[i] = allow[0];
201 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
204 prog.filter = filter;
207 /* Too many filter instructions in a single filter. */
208 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
210 TH_LOG("Installing %d insn filter was allowed", prog.len);
213 /* One less is okay, though. */
215 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
217 TH_LOG("Installing %d insn filter wasn't allowed", prog.len);
221 TEST(filter_chain_limits)
224 int count = BPF_MAXINSNS;
225 struct sock_filter allow[] = {
226 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
228 struct sock_filter *filter;
229 struct sock_fprog prog = { };
232 filter = calloc(count, sizeof(*filter));
233 ASSERT_NE(NULL, filter);
235 for (i = 0; i < count; i++)
236 filter[i] = allow[0];
238 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
241 prog.filter = filter;
244 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
249 /* Too many total filter instructions. */
250 for (i = 0; i < MAX_INSNS_PER_PATH; i++) {
251 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
256 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
257 i, count, i * (count + 4));
261 TEST(mode_filter_cannot_move_to_strict)
263 struct sock_filter filter[] = {
264 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
266 struct sock_fprog prog = {
267 .len = (unsigned short)ARRAY_SIZE(filter),
272 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
275 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
278 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0);
280 EXPECT_EQ(EINVAL, errno);
284 TEST(mode_filter_get_seccomp)
286 struct sock_filter filter[] = {
287 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
289 struct sock_fprog prog = {
290 .len = (unsigned short)ARRAY_SIZE(filter),
295 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
298 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
301 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
304 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
311 struct sock_filter filter[] = {
312 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
314 struct sock_fprog prog = {
315 .len = (unsigned short)ARRAY_SIZE(filter),
320 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
323 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
329 struct sock_filter filter[] = {
331 struct sock_fprog prog = {
332 .len = (unsigned short)ARRAY_SIZE(filter),
337 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
340 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
342 EXPECT_EQ(EINVAL, errno);
345 TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS)
347 struct sock_filter filter[] = {
348 BPF_STMT(BPF_RET|BPF_K, 0x10000000U),
350 struct sock_fprog prog = {
351 .len = (unsigned short)ARRAY_SIZE(filter),
356 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
359 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
361 EXPECT_EQ(0, syscall(__NR_getpid)) {
362 TH_LOG("getpid() shouldn't ever return");
366 /* return code >= 0x80000000 is unused. */
367 TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS)
369 struct sock_filter filter[] = {
370 BPF_STMT(BPF_RET|BPF_K, 0x90000000U),
372 struct sock_fprog prog = {
373 .len = (unsigned short)ARRAY_SIZE(filter),
378 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
381 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
383 EXPECT_EQ(0, syscall(__NR_getpid)) {
384 TH_LOG("getpid() shouldn't ever return");
388 TEST_SIGNAL(KILL_all, SIGSYS)
390 struct sock_filter filter[] = {
391 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
393 struct sock_fprog prog = {
394 .len = (unsigned short)ARRAY_SIZE(filter),
399 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
402 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
406 TEST_SIGNAL(KILL_one, SIGSYS)
408 struct sock_filter filter[] = {
409 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
410 offsetof(struct seccomp_data, nr)),
411 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
412 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
413 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
415 struct sock_fprog prog = {
416 .len = (unsigned short)ARRAY_SIZE(filter),
420 pid_t parent = getppid();
422 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
425 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
428 EXPECT_EQ(parent, syscall(__NR_getppid));
429 /* getpid() should never return. */
430 EXPECT_EQ(0, syscall(__NR_getpid));
433 TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
436 struct sock_filter filter[] = {
437 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
438 offsetof(struct seccomp_data, nr)),
439 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
440 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
441 /* Only both with lower 32-bit for now. */
442 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
443 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
444 (unsigned long)&fatal_address, 0, 1),
445 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
446 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
448 struct sock_fprog prog = {
449 .len = (unsigned short)ARRAY_SIZE(filter),
453 pid_t parent = getppid();
455 clock_t clock = times(&timebuf);
457 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
460 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
463 EXPECT_EQ(parent, syscall(__NR_getppid));
464 EXPECT_LE(clock, syscall(__NR_times, &timebuf));
465 /* times() should never return. */
466 EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
469 TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
472 int sysno = __NR_mmap;
474 int sysno = __NR_mmap2;
476 struct sock_filter filter[] = {
477 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
478 offsetof(struct seccomp_data, nr)),
479 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
480 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
481 /* Only both with lower 32-bit for now. */
482 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
483 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
484 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
485 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
487 struct sock_fprog prog = {
488 .len = (unsigned short)ARRAY_SIZE(filter),
492 pid_t parent = getppid();
496 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
499 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
502 fd = open("/dev/zero", O_RDONLY);
505 EXPECT_EQ(parent, syscall(__NR_getppid));
506 map1 = (void *)syscall(sysno,
507 NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, PAGE_SIZE);
508 EXPECT_NE(MAP_FAILED, map1);
509 /* mmap2() should never return. */
510 map2 = (void *)syscall(sysno,
511 NULL, PAGE_SIZE, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
512 EXPECT_EQ(MAP_FAILED, map2);
514 /* The test failed, so clean up the resources. */
515 munmap(map1, PAGE_SIZE);
516 munmap(map2, PAGE_SIZE);
520 /* TODO(wad) add 64-bit versus 32-bit arg tests. */
521 TEST(arg_out_of_range)
523 struct sock_filter filter[] = {
524 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
525 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
527 struct sock_fprog prog = {
528 .len = (unsigned short)ARRAY_SIZE(filter),
533 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
536 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
538 EXPECT_EQ(EINVAL, errno);
543 struct sock_filter filter[] = {
544 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
545 offsetof(struct seccomp_data, nr)),
546 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
547 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | E2BIG),
548 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
550 struct sock_fprog prog = {
551 .len = (unsigned short)ARRAY_SIZE(filter),
555 pid_t parent = getppid();
557 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
560 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
563 EXPECT_EQ(parent, syscall(__NR_getppid));
564 EXPECT_EQ(-1, read(0, NULL, 0));
565 EXPECT_EQ(E2BIG, errno);
570 struct sock_filter filter[] = {
571 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
572 offsetof(struct seccomp_data, nr)),
573 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
574 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | 0),
575 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
577 struct sock_fprog prog = {
578 .len = (unsigned short)ARRAY_SIZE(filter),
582 pid_t parent = getppid();
584 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
587 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
590 EXPECT_EQ(parent, syscall(__NR_getppid));
591 /* "errno" of 0 is ok. */
592 EXPECT_EQ(0, read(0, NULL, 0));
597 struct sock_filter filter[] = {
598 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
599 offsetof(struct seccomp_data, nr)),
600 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
601 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | 4096),
602 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
604 struct sock_fprog prog = {
605 .len = (unsigned short)ARRAY_SIZE(filter),
609 pid_t parent = getppid();
611 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
614 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
617 EXPECT_EQ(parent, syscall(__NR_getppid));
618 EXPECT_EQ(-1, read(0, NULL, 0));
619 EXPECT_EQ(4095, errno);
623 struct sock_fprog prog;
628 struct sock_filter filter[] = {
629 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
630 offsetof(struct seccomp_data, nr)),
631 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
632 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
633 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
636 memset(&self->prog, 0, sizeof(self->prog));
637 self->prog.filter = malloc(sizeof(filter));
638 ASSERT_NE(NULL, self->prog.filter);
639 memcpy(self->prog.filter, filter, sizeof(filter));
640 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
643 FIXTURE_TEARDOWN(TRAP)
645 if (self->prog.filter)
646 free(self->prog.filter);
649 TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
653 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
656 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
658 syscall(__NR_getpid);
661 /* Ensure that SIGSYS overrides SIG_IGN */
662 TEST_F_SIGNAL(TRAP, ign, SIGSYS)
666 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
669 signal(SIGSYS, SIG_IGN);
671 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
673 syscall(__NR_getpid);
676 static struct siginfo TRAP_info;
677 static volatile int TRAP_nr;
678 static void TRAP_action(int nr, siginfo_t *info, void *void_context)
680 memcpy(&TRAP_info, info, sizeof(TRAP_info));
684 TEST_F(TRAP, handler)
687 struct sigaction act;
690 memset(&act, 0, sizeof(act));
692 sigaddset(&mask, SIGSYS);
694 act.sa_sigaction = &TRAP_action;
695 act.sa_flags = SA_SIGINFO;
696 ret = sigaction(SIGSYS, &act, NULL);
698 TH_LOG("sigaction failed");
700 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
702 TH_LOG("sigprocmask failed");
705 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
707 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
710 memset(&TRAP_info, 0, sizeof(TRAP_info));
711 /* Expect the registers to be rolled back. (nr = error) may vary
713 ret = syscall(__NR_getpid);
714 /* Silence gcc warning about volatile. */
716 EXPECT_EQ(SIGSYS, test);
717 struct local_sigsys {
718 void *_call_addr; /* calling user insn */
719 int _syscall; /* triggering system call number */
720 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
721 } *sigsys = (struct local_sigsys *)
723 &(TRAP_info.si_call_addr);
727 EXPECT_EQ(__NR_getpid, sigsys->_syscall);
728 /* Make sure arch is non-zero. */
729 EXPECT_NE(0, sigsys->_arch);
730 EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
733 FIXTURE_DATA(precedence) {
734 struct sock_fprog allow;
735 struct sock_fprog trace;
736 struct sock_fprog error;
737 struct sock_fprog trap;
738 struct sock_fprog kill;
741 FIXTURE_SETUP(precedence)
743 struct sock_filter allow_insns[] = {
744 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
746 struct sock_filter trace_insns[] = {
747 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
748 offsetof(struct seccomp_data, nr)),
749 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
750 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
751 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
753 struct sock_filter error_insns[] = {
754 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
755 offsetof(struct seccomp_data, nr)),
756 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
757 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
758 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
760 struct sock_filter trap_insns[] = {
761 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
762 offsetof(struct seccomp_data, nr)),
763 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
764 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
765 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
767 struct sock_filter kill_insns[] = {
768 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
769 offsetof(struct seccomp_data, nr)),
770 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
771 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
772 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
775 memset(self, 0, sizeof(*self));
776 #define FILTER_ALLOC(_x) \
777 self->_x.filter = malloc(sizeof(_x##_insns)); \
778 ASSERT_NE(NULL, self->_x.filter); \
779 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
780 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
788 FIXTURE_TEARDOWN(precedence)
790 #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
798 TEST_F(precedence, allow_ok)
800 pid_t parent, res = 0;
804 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
807 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
809 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
811 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
813 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
815 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
817 /* Should work just fine. */
818 res = syscall(__NR_getppid);
819 EXPECT_EQ(parent, res);
822 TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
824 pid_t parent, res = 0;
828 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
831 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
833 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
835 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
837 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
839 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
841 /* Should work just fine. */
842 res = syscall(__NR_getppid);
843 EXPECT_EQ(parent, res);
844 /* getpid() should never return. */
845 res = syscall(__NR_getpid);
849 TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
855 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
858 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
860 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
862 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
864 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
866 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
868 /* Should work just fine. */
869 EXPECT_EQ(parent, syscall(__NR_getppid));
870 /* getpid() should never return. */
871 EXPECT_EQ(0, syscall(__NR_getpid));
874 TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
880 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
883 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
885 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
887 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
889 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
891 /* Should work just fine. */
892 EXPECT_EQ(parent, syscall(__NR_getppid));
893 /* getpid() should never return. */
894 EXPECT_EQ(0, syscall(__NR_getpid));
897 TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
903 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
906 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
908 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
910 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
912 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
914 /* Should work just fine. */
915 EXPECT_EQ(parent, syscall(__NR_getppid));
916 /* getpid() should never return. */
917 EXPECT_EQ(0, syscall(__NR_getpid));
920 TEST_F(precedence, errno_is_third)
926 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
929 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
931 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
933 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
935 /* Should work just fine. */
936 EXPECT_EQ(parent, syscall(__NR_getppid));
937 EXPECT_EQ(0, syscall(__NR_getpid));
940 TEST_F(precedence, errno_is_third_in_any_order)
946 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
949 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
951 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
953 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
955 /* Should work just fine. */
956 EXPECT_EQ(parent, syscall(__NR_getppid));
957 EXPECT_EQ(0, syscall(__NR_getpid));
960 TEST_F(precedence, trace_is_fourth)
966 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
969 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
971 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
973 /* Should work just fine. */
974 EXPECT_EQ(parent, syscall(__NR_getppid));
976 EXPECT_EQ(-1, syscall(__NR_getpid));
979 TEST_F(precedence, trace_is_fourth_in_any_order)
985 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
988 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
990 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
992 /* Should work just fine. */
993 EXPECT_EQ(parent, syscall(__NR_getppid));
995 EXPECT_EQ(-1, syscall(__NR_getpid));
998 #ifndef PTRACE_O_TRACESECCOMP
999 #define PTRACE_O_TRACESECCOMP 0x00000080
1002 /* Catch the Ubuntu 12.04 value error. */
1003 #if PTRACE_EVENT_SECCOMP != 7
1004 #undef PTRACE_EVENT_SECCOMP
1007 #ifndef PTRACE_EVENT_SECCOMP
1008 #define PTRACE_EVENT_SECCOMP 7
1011 #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1012 bool tracer_running;
1013 void tracer_stop(int sig)
1015 tracer_running = false;
1018 typedef void tracer_func_t(struct __test_metadata *_metadata,
1019 pid_t tracee, int status, void *args);
1021 void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
1022 tracer_func_t tracer_func, void *args)
1025 struct sigaction action = {
1026 .sa_handler = tracer_stop,
1029 /* Allow external shutdown. */
1030 tracer_running = true;
1031 ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
1034 while (ret == -1 && errno != EINVAL)
1035 ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
1037 kill(tracee, SIGKILL);
1039 /* Wait for attach stop */
1042 ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, PTRACE_O_TRACESECCOMP);
1044 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1045 kill(tracee, SIGKILL);
1047 ptrace(PTRACE_CONT, tracee, NULL, 0);
1049 /* Unblock the tracee */
1050 ASSERT_EQ(1, write(fd, "A", 1));
1051 ASSERT_EQ(0, close(fd));
1053 /* Run until we're shut down. Must assert to stop execution. */
1054 while (tracer_running) {
1057 if (wait(&status) != tracee)
1059 if (WIFSIGNALED(status) || WIFEXITED(status))
1060 /* Child is dead. Time to go. */
1063 /* Make sure this is a seccomp event. */
1064 ASSERT_EQ(true, IS_SECCOMP_EVENT(status));
1066 tracer_func(_metadata, tracee, status, args);
1068 ret = ptrace(PTRACE_CONT, tracee, NULL, NULL);
1071 /* Directly report the status of our test harness results. */
1072 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
1075 /* Common tracer setup/teardown functions. */
1076 void cont_handler(int num)
1078 pid_t setup_trace_fixture(struct __test_metadata *_metadata,
1079 tracer_func_t func, void *args)
1084 pid_t tracee = getpid();
1086 /* Setup a pipe for clean synchronization. */
1087 ASSERT_EQ(0, pipe(pipefd));
1089 /* Fork a child which we'll promote to tracer */
1090 tracer_pid = fork();
1091 ASSERT_LE(0, tracer_pid);
1092 signal(SIGALRM, cont_handler);
1093 if (tracer_pid == 0) {
1095 tracer(_metadata, pipefd[1], tracee, func, args);
1096 syscall(__NR_exit, 0);
1099 prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
1100 read(pipefd[0], &sync, 1);
1105 void teardown_trace_fixture(struct __test_metadata *_metadata,
1111 * Extract the exit code from the other process and
1112 * adopt it for ourselves in case its asserts failed.
1114 ASSERT_EQ(0, kill(tracer, SIGUSR1));
1115 ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
1116 if (WEXITSTATUS(status))
1117 _metadata->passed = 0;
1121 /* "poke" tracer arguments and function. */
1122 struct tracer_args_poke_t {
1123 unsigned long poke_addr;
1126 void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
1131 struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
1133 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1135 /* If this fails, don't try to recover. */
1136 ASSERT_EQ(0x1001, msg) {
1137 kill(tracee, SIGKILL);
1140 * Poke in the message.
1141 * Registers are not touched to try to keep this relatively arch
1144 ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
1148 FIXTURE_DATA(TRACE_poke) {
1149 struct sock_fprog prog;
1152 struct tracer_args_poke_t tracer_args;
1155 FIXTURE_SETUP(TRACE_poke)
1157 struct sock_filter filter[] = {
1158 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1159 offsetof(struct seccomp_data, nr)),
1160 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1161 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
1162 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1166 memset(&self->prog, 0, sizeof(self->prog));
1167 self->prog.filter = malloc(sizeof(filter));
1168 ASSERT_NE(NULL, self->prog.filter);
1169 memcpy(self->prog.filter, filter, sizeof(filter));
1170 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1172 /* Set up tracer args. */
1173 self->tracer_args.poke_addr = (unsigned long)&self->poked;
1175 /* Launch tracer. */
1176 self->tracer = setup_trace_fixture(_metadata, tracer_poke,
1177 &self->tracer_args);
1180 FIXTURE_TEARDOWN(TRACE_poke)
1182 teardown_trace_fixture(_metadata, self->tracer);
1183 if (self->prog.filter)
1184 free(self->prog.filter);
1187 TEST_F(TRACE_poke, read_has_side_effects)
1191 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1194 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1197 EXPECT_EQ(0, self->poked);
1198 ret = read(-1, NULL, 0);
1200 EXPECT_EQ(0x1001, self->poked);
1203 TEST_F(TRACE_poke, getpid_runs_normally)
1207 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1210 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1213 EXPECT_EQ(0, self->poked);
1214 EXPECT_NE(0, syscall(__NR_getpid));
1215 EXPECT_EQ(0, self->poked);
1218 #if defined(__x86_64__)
1219 # define ARCH_REGS struct user_regs_struct
1220 # define SYSCALL_NUM orig_rax
1221 # define SYSCALL_RET rax
1222 #elif defined(__i386__)
1223 # define ARCH_REGS struct user_regs_struct
1224 # define SYSCALL_NUM orig_eax
1225 # define SYSCALL_RET eax
1226 #elif defined(__arm__)
1227 # define ARCH_REGS struct pt_regs
1228 # define SYSCALL_NUM ARM_r7
1229 # define SYSCALL_RET ARM_r0
1230 #elif defined(__aarch64__)
1231 # define ARCH_REGS struct user_pt_regs
1232 # define SYSCALL_NUM regs[8]
1233 # define SYSCALL_RET regs[0]
1234 #elif defined(__powerpc__)
1235 # define ARCH_REGS struct pt_regs
1236 # define SYSCALL_NUM gpr[0]
1237 # define SYSCALL_RET gpr[3]
1238 #elif defined(__s390__)
1239 # define ARCH_REGS s390_regs
1240 # define SYSCALL_NUM gprs[2]
1241 # define SYSCALL_RET gprs[2]
1243 # error "Do not know how to find your architecture's registers and syscalls"
1246 /* Architecture-specific syscall fetching routine. */
1247 int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
1252 iov.iov_base = ®s;
1253 iov.iov_len = sizeof(regs);
1254 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
1255 TH_LOG("PTRACE_GETREGSET failed");
1259 return regs.SYSCALL_NUM;
1262 /* Architecture-specific syscall changing routine. */
1263 void change_syscall(struct __test_metadata *_metadata,
1264 pid_t tracee, int syscall)
1270 iov.iov_base = ®s;
1271 iov.iov_len = sizeof(regs);
1272 ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
1275 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1278 regs.SYSCALL_NUM = syscall;
1281 #elif defined(__arm__)
1282 # ifndef PTRACE_SET_SYSCALL
1283 # define PTRACE_SET_SYSCALL 23
1286 ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
1290 #elif defined(__aarch64__)
1291 # ifndef NT_ARM_SYSTEM_CALL
1292 # define NT_ARM_SYSTEM_CALL 0x404
1295 iov.iov_base = &syscall;
1296 iov.iov_len = sizeof(syscall);
1297 ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
1304 TH_LOG("How is the syscall changed on this architecture?");
1308 /* If syscall is skipped, change return value. */
1310 regs.SYSCALL_RET = 1;
1312 iov.iov_base = ®s;
1313 iov.iov_len = sizeof(regs);
1314 ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
1318 void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
1319 int status, void *args)
1324 /* Make sure we got the right message. */
1325 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1328 /* Validate and take action on expected syscalls. */
1331 /* change getpid to getppid. */
1332 EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
1333 change_syscall(_metadata, tracee, __NR_getppid);
1337 EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
1338 change_syscall(_metadata, tracee, -1);
1341 /* do nothing (allow getppid) */
1342 EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
1346 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
1347 kill(tracee, SIGKILL);
1353 FIXTURE_DATA(TRACE_syscall) {
1354 struct sock_fprog prog;
1355 pid_t tracer, mytid, mypid, parent;
1358 FIXTURE_SETUP(TRACE_syscall)
1360 struct sock_filter filter[] = {
1361 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1362 offsetof(struct seccomp_data, nr)),
1363 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1364 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
1365 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
1366 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
1367 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1368 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
1369 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1372 memset(&self->prog, 0, sizeof(self->prog));
1373 self->prog.filter = malloc(sizeof(filter));
1374 ASSERT_NE(NULL, self->prog.filter);
1375 memcpy(self->prog.filter, filter, sizeof(filter));
1376 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1378 /* Prepare some testable syscall results. */
1379 self->mytid = syscall(__NR_gettid);
1380 ASSERT_GT(self->mytid, 0);
1381 ASSERT_NE(self->mytid, 1) {
1382 TH_LOG("Running this test as init is not supported. :)");
1385 self->mypid = getpid();
1386 ASSERT_GT(self->mypid, 0);
1387 ASSERT_EQ(self->mytid, self->mypid);
1389 self->parent = getppid();
1390 ASSERT_GT(self->parent, 0);
1391 ASSERT_NE(self->parent, self->mypid);
1393 /* Launch tracer. */
1394 self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL);
1397 FIXTURE_TEARDOWN(TRACE_syscall)
1399 teardown_trace_fixture(_metadata, self->tracer);
1400 if (self->prog.filter)
1401 free(self->prog.filter);
1404 TEST_F(TRACE_syscall, syscall_allowed)
1408 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1411 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1414 /* getppid works as expected (no changes). */
1415 EXPECT_EQ(self->parent, syscall(__NR_getppid));
1416 EXPECT_NE(self->mypid, syscall(__NR_getppid));
1419 TEST_F(TRACE_syscall, syscall_redirected)
1423 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1426 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1429 /* getpid has been redirected to getppid as expected. */
1430 EXPECT_EQ(self->parent, syscall(__NR_getpid));
1431 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1434 TEST_F(TRACE_syscall, syscall_dropped)
1438 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1441 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1444 /* gettid has been skipped and an altered return value stored. */
1445 EXPECT_EQ(1, syscall(__NR_gettid));
1446 EXPECT_NE(self->mytid, syscall(__NR_gettid));
1449 #ifndef __NR_seccomp
1450 # if defined(__i386__)
1451 # define __NR_seccomp 354
1452 # elif defined(__x86_64__)
1453 # define __NR_seccomp 317
1454 # elif defined(__arm__)
1455 # define __NR_seccomp 383
1456 # elif defined(__aarch64__)
1457 # define __NR_seccomp 277
1458 # elif defined(__powerpc__)
1459 # define __NR_seccomp 358
1460 # elif defined(__s390__)
1461 # define __NR_seccomp 348
1463 # warning "seccomp syscall number unknown for this architecture"
1464 # define __NR_seccomp 0xffff
1468 #ifndef SECCOMP_SET_MODE_STRICT
1469 #define SECCOMP_SET_MODE_STRICT 0
1472 #ifndef SECCOMP_SET_MODE_FILTER
1473 #define SECCOMP_SET_MODE_FILTER 1
1476 #ifndef SECCOMP_FLAG_FILTER_TSYNC
1477 #define SECCOMP_FLAG_FILTER_TSYNC 1
1481 int seccomp(unsigned int op, unsigned int flags, struct sock_fprog *filter)
1484 return syscall(__NR_seccomp, op, flags, filter);
1488 TEST(seccomp_syscall)
1490 struct sock_filter filter[] = {
1491 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1493 struct sock_fprog prog = {
1494 .len = (unsigned short)ARRAY_SIZE(filter),
1499 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1501 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1504 /* Reject insane operation. */
1505 ret = seccomp(-1, 0, &prog);
1506 ASSERT_NE(ENOSYS, errno) {
1507 TH_LOG("Kernel does not support seccomp syscall!");
1509 EXPECT_EQ(EINVAL, errno) {
1510 TH_LOG("Did not reject crazy op value!");
1513 /* Reject strict with flags or pointer. */
1514 ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
1515 EXPECT_EQ(EINVAL, errno) {
1516 TH_LOG("Did not reject mode strict with flags!");
1518 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
1519 EXPECT_EQ(EINVAL, errno) {
1520 TH_LOG("Did not reject mode strict with uargs!");
1523 /* Reject insane args for filter. */
1524 ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
1525 EXPECT_EQ(EINVAL, errno) {
1526 TH_LOG("Did not reject crazy filter flags!");
1528 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
1529 EXPECT_EQ(EFAULT, errno) {
1530 TH_LOG("Did not reject NULL filter!");
1533 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1534 EXPECT_EQ(0, errno) {
1535 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
1540 TEST(seccomp_syscall_mode_lock)
1542 struct sock_filter filter[] = {
1543 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1545 struct sock_fprog prog = {
1546 .len = (unsigned short)ARRAY_SIZE(filter),
1551 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
1553 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1556 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1557 ASSERT_NE(ENOSYS, errno) {
1558 TH_LOG("Kernel does not support seccomp syscall!");
1561 TH_LOG("Could not install filter!");
1564 /* Make sure neither entry point will switch to strict. */
1565 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
1566 EXPECT_EQ(EINVAL, errno) {
1567 TH_LOG("Switched to mode strict!");
1570 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
1571 EXPECT_EQ(EINVAL, errno) {
1572 TH_LOG("Switched to mode strict!");
1578 struct sock_filter filter[] = {
1579 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1581 struct sock_fprog prog = {
1582 .len = (unsigned short)ARRAY_SIZE(filter),
1587 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
1589 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1592 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
1594 ASSERT_NE(ENOSYS, errno) {
1595 TH_LOG("Kernel does not support seccomp syscall!");
1598 TH_LOG("Could not install initial filter with TSYNC!");
1602 #define TSYNC_SIBLINGS 2
1603 struct tsync_sibling {
1607 pthread_cond_t *cond;
1608 pthread_mutex_t *mutex;
1611 struct sock_fprog *prog;
1612 struct __test_metadata *metadata;
1615 FIXTURE_DATA(TSYNC) {
1616 struct sock_fprog root_prog, apply_prog;
1617 struct tsync_sibling sibling[TSYNC_SIBLINGS];
1619 pthread_cond_t cond;
1620 pthread_mutex_t mutex;
1624 FIXTURE_SETUP(TSYNC)
1626 struct sock_filter root_filter[] = {
1627 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1629 struct sock_filter apply_filter[] = {
1630 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1631 offsetof(struct seccomp_data, nr)),
1632 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1633 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1634 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1637 memset(&self->root_prog, 0, sizeof(self->root_prog));
1638 memset(&self->apply_prog, 0, sizeof(self->apply_prog));
1639 memset(&self->sibling, 0, sizeof(self->sibling));
1640 self->root_prog.filter = malloc(sizeof(root_filter));
1641 ASSERT_NE(NULL, self->root_prog.filter);
1642 memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
1643 self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
1645 self->apply_prog.filter = malloc(sizeof(apply_filter));
1646 ASSERT_NE(NULL, self->apply_prog.filter);
1647 memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
1648 self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
1650 self->sibling_count = 0;
1651 pthread_mutex_init(&self->mutex, NULL);
1652 pthread_cond_init(&self->cond, NULL);
1653 sem_init(&self->started, 0, 0);
1654 self->sibling[0].tid = 0;
1655 self->sibling[0].cond = &self->cond;
1656 self->sibling[0].started = &self->started;
1657 self->sibling[0].mutex = &self->mutex;
1658 self->sibling[0].diverge = 0;
1659 self->sibling[0].num_waits = 1;
1660 self->sibling[0].prog = &self->root_prog;
1661 self->sibling[0].metadata = _metadata;
1662 self->sibling[1].tid = 0;
1663 self->sibling[1].cond = &self->cond;
1664 self->sibling[1].started = &self->started;
1665 self->sibling[1].mutex = &self->mutex;
1666 self->sibling[1].diverge = 0;
1667 self->sibling[1].prog = &self->root_prog;
1668 self->sibling[1].num_waits = 1;
1669 self->sibling[1].metadata = _metadata;
1672 FIXTURE_TEARDOWN(TSYNC)
1676 if (self->root_prog.filter)
1677 free(self->root_prog.filter);
1678 if (self->apply_prog.filter)
1679 free(self->apply_prog.filter);
1681 for ( ; sib < self->sibling_count; ++sib) {
1682 struct tsync_sibling *s = &self->sibling[sib];
1687 if (pthread_kill(s->tid, 0)) {
1688 pthread_cancel(s->tid);
1689 pthread_join(s->tid, &status);
1692 pthread_mutex_destroy(&self->mutex);
1693 pthread_cond_destroy(&self->cond);
1694 sem_destroy(&self->started);
1697 void *tsync_sibling(void *data)
1700 struct tsync_sibling *me = data;
1702 me->system_tid = syscall(__NR_gettid);
1704 pthread_mutex_lock(me->mutex);
1706 /* Just re-apply the root prog to fork the tree */
1707 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
1710 sem_post(me->started);
1711 /* Return outside of started so parent notices failures. */
1713 pthread_mutex_unlock(me->mutex);
1714 return (void *)SIBLING_EXIT_FAILURE;
1717 pthread_cond_wait(me->cond, me->mutex);
1718 me->num_waits = me->num_waits - 1;
1719 } while (me->num_waits);
1720 pthread_mutex_unlock(me->mutex);
1722 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
1724 return (void *)SIBLING_EXIT_NEWPRIVS;
1726 return (void *)SIBLING_EXIT_UNKILLED;
1729 void tsync_start_sibling(struct tsync_sibling *sibling)
1731 pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
1734 TEST_F(TSYNC, siblings_fail_prctl)
1738 struct sock_filter filter[] = {
1739 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1740 offsetof(struct seccomp_data, nr)),
1741 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
1742 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
1743 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1745 struct sock_fprog prog = {
1746 .len = (unsigned short)ARRAY_SIZE(filter),
1750 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1751 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1754 /* Check prctl failure detection by requesting sib 0 diverge. */
1755 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1756 ASSERT_NE(ENOSYS, errno) {
1757 TH_LOG("Kernel does not support seccomp syscall!");
1760 TH_LOG("setting filter failed");
1763 self->sibling[0].diverge = 1;
1764 tsync_start_sibling(&self->sibling[0]);
1765 tsync_start_sibling(&self->sibling[1]);
1767 while (self->sibling_count < TSYNC_SIBLINGS) {
1768 sem_wait(&self->started);
1769 self->sibling_count++;
1772 /* Signal the threads to clean up*/
1773 pthread_mutex_lock(&self->mutex);
1774 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1775 TH_LOG("cond broadcast non-zero");
1777 pthread_mutex_unlock(&self->mutex);
1779 /* Ensure diverging sibling failed to call prctl. */
1780 pthread_join(self->sibling[0].tid, &status);
1781 EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
1782 pthread_join(self->sibling[1].tid, &status);
1783 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
1786 TEST_F(TSYNC, two_siblings_with_ancestor)
1791 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1792 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1795 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
1796 ASSERT_NE(ENOSYS, errno) {
1797 TH_LOG("Kernel does not support seccomp syscall!");
1800 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
1802 tsync_start_sibling(&self->sibling[0]);
1803 tsync_start_sibling(&self->sibling[1]);
1805 while (self->sibling_count < TSYNC_SIBLINGS) {
1806 sem_wait(&self->started);
1807 self->sibling_count++;
1810 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
1813 TH_LOG("Could install filter on all threads!");
1815 /* Tell the siblings to test the policy */
1816 pthread_mutex_lock(&self->mutex);
1817 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1818 TH_LOG("cond broadcast non-zero");
1820 pthread_mutex_unlock(&self->mutex);
1821 /* Ensure they are both killed and don't exit cleanly. */
1822 pthread_join(self->sibling[0].tid, &status);
1823 EXPECT_EQ(0x0, (long)status);
1824 pthread_join(self->sibling[1].tid, &status);
1825 EXPECT_EQ(0x0, (long)status);
1828 TEST_F(TSYNC, two_sibling_want_nnp)
1832 /* start siblings before any prctl() operations */
1833 tsync_start_sibling(&self->sibling[0]);
1834 tsync_start_sibling(&self->sibling[1]);
1835 while (self->sibling_count < TSYNC_SIBLINGS) {
1836 sem_wait(&self->started);
1837 self->sibling_count++;
1840 /* Tell the siblings to test no policy */
1841 pthread_mutex_lock(&self->mutex);
1842 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1843 TH_LOG("cond broadcast non-zero");
1845 pthread_mutex_unlock(&self->mutex);
1847 /* Ensure they are both upset about lacking nnp. */
1848 pthread_join(self->sibling[0].tid, &status);
1849 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
1850 pthread_join(self->sibling[1].tid, &status);
1851 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
1854 TEST_F(TSYNC, two_siblings_with_no_filter)
1859 /* start siblings before any prctl() operations */
1860 tsync_start_sibling(&self->sibling[0]);
1861 tsync_start_sibling(&self->sibling[1]);
1862 while (self->sibling_count < TSYNC_SIBLINGS) {
1863 sem_wait(&self->started);
1864 self->sibling_count++;
1867 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1868 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1871 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
1873 ASSERT_NE(ENOSYS, errno) {
1874 TH_LOG("Kernel does not support seccomp syscall!");
1877 TH_LOG("Could install filter on all threads!");
1880 /* Tell the siblings to test the policy */
1881 pthread_mutex_lock(&self->mutex);
1882 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1883 TH_LOG("cond broadcast non-zero");
1885 pthread_mutex_unlock(&self->mutex);
1887 /* Ensure they are both killed and don't exit cleanly. */
1888 pthread_join(self->sibling[0].tid, &status);
1889 EXPECT_EQ(0x0, (long)status);
1890 pthread_join(self->sibling[1].tid, &status);
1891 EXPECT_EQ(0x0, (long)status);
1894 TEST_F(TSYNC, two_siblings_with_one_divergence)
1899 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1900 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1903 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
1904 ASSERT_NE(ENOSYS, errno) {
1905 TH_LOG("Kernel does not support seccomp syscall!");
1908 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
1910 self->sibling[0].diverge = 1;
1911 tsync_start_sibling(&self->sibling[0]);
1912 tsync_start_sibling(&self->sibling[1]);
1914 while (self->sibling_count < TSYNC_SIBLINGS) {
1915 sem_wait(&self->started);
1916 self->sibling_count++;
1919 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
1921 ASSERT_EQ(self->sibling[0].system_tid, ret) {
1922 TH_LOG("Did not fail on diverged sibling.");
1925 /* Wake the threads */
1926 pthread_mutex_lock(&self->mutex);
1927 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1928 TH_LOG("cond broadcast non-zero");
1930 pthread_mutex_unlock(&self->mutex);
1932 /* Ensure they are both unkilled. */
1933 pthread_join(self->sibling[0].tid, &status);
1934 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
1935 pthread_join(self->sibling[1].tid, &status);
1936 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
1939 TEST_F(TSYNC, two_siblings_not_under_filter)
1944 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1945 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1949 * Sibling 0 will have its own seccomp policy
1950 * and Sibling 1 will not be under seccomp at
1951 * all. Sibling 1 will enter seccomp and 0
1952 * will cause failure.
1954 self->sibling[0].diverge = 1;
1955 tsync_start_sibling(&self->sibling[0]);
1956 tsync_start_sibling(&self->sibling[1]);
1958 while (self->sibling_count < TSYNC_SIBLINGS) {
1959 sem_wait(&self->started);
1960 self->sibling_count++;
1963 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
1964 ASSERT_NE(ENOSYS, errno) {
1965 TH_LOG("Kernel does not support seccomp syscall!");
1968 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
1971 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
1973 ASSERT_EQ(ret, self->sibling[0].system_tid) {
1974 TH_LOG("Did not fail on diverged sibling.");
1977 if (ret == self->sibling[0].system_tid)
1980 pthread_mutex_lock(&self->mutex);
1982 /* Increment the other siblings num_waits so we can clean up
1983 * the one we just saw.
1985 self->sibling[!sib].num_waits += 1;
1987 /* Signal the thread to clean up*/
1988 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1989 TH_LOG("cond broadcast non-zero");
1991 pthread_mutex_unlock(&self->mutex);
1992 pthread_join(self->sibling[sib].tid, &status);
1993 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
1994 /* Poll for actual task death. pthread_join doesn't guarantee it. */
1995 while (!kill(self->sibling[sib].system_tid, 0))
1997 /* Switch to the remaining sibling */
2000 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
2003 TH_LOG("Expected the remaining sibling to sync");
2006 pthread_mutex_lock(&self->mutex);
2008 /* If remaining sibling didn't have a chance to wake up during
2009 * the first broadcast, manually reduce the num_waits now.
2011 if (self->sibling[sib].num_waits > 1)
2012 self->sibling[sib].num_waits = 1;
2013 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2014 TH_LOG("cond broadcast non-zero");
2016 pthread_mutex_unlock(&self->mutex);
2017 pthread_join(self->sibling[sib].tid, &status);
2018 EXPECT_EQ(0, (long)status);
2019 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2020 while (!kill(self->sibling[sib].system_tid, 0))
2023 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FLAG_FILTER_TSYNC,
2025 ASSERT_EQ(0, ret); /* just us chickens */
2028 /* Make sure restarted syscalls are seen directly as "restart_syscall". */
2029 TEST(syscall_restart)
2036 siginfo_t info = { };
2037 struct sock_filter filter[] = {
2038 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2039 offsetof(struct seccomp_data, nr)),
2041 #ifdef __NR_sigreturn
2042 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0),
2044 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0),
2045 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0),
2046 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0),
2047 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0),
2048 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
2050 /* Allow __NR_write for easy logging. */
2051 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
2052 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2053 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2054 /* The nanosleep jump target. */
2055 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
2056 /* The restart_syscall jump target. */
2057 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
2059 struct sock_fprog prog = {
2060 .len = (unsigned short)ARRAY_SIZE(filter),
2063 #if defined(__arm__)
2064 struct utsname utsbuf;
2067 ASSERT_EQ(0, pipe(pipefd));
2070 ASSERT_LE(0, child_pid);
2071 if (child_pid == 0) {
2072 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2074 struct timespec timeout = { };
2076 /* Attach parent as tracer and stop. */
2077 EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
2078 EXPECT_EQ(0, raise(SIGSTOP));
2080 EXPECT_EQ(0, close(pipefd[1]));
2082 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2083 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2086 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2088 TH_LOG("Failed to install filter!");
2091 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2092 TH_LOG("Failed to read() sync from parent");
2094 EXPECT_EQ('.', buf) {
2095 TH_LOG("Failed to get sync data from read()");
2098 /* Start nanosleep to be interrupted. */
2101 EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
2102 TH_LOG("Call to nanosleep() failed (errno %d)", errno);
2105 /* Read final sync from parent. */
2106 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2107 TH_LOG("Failed final read() from parent");
2109 EXPECT_EQ('!', buf) {
2110 TH_LOG("Failed to get final data from read()");
2113 /* Directly report the status of our test harness results. */
2114 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
2117 EXPECT_EQ(0, close(pipefd[0]));
2119 /* Attach to child, setup options, and release. */
2120 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2121 ASSERT_EQ(true, WIFSTOPPED(status));
2122 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
2123 PTRACE_O_TRACESECCOMP));
2124 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2125 ASSERT_EQ(1, write(pipefd[1], ".", 1));
2127 /* Wait for nanosleep() to start. */
2128 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2129 ASSERT_EQ(true, WIFSTOPPED(status));
2130 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2131 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2132 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2133 ASSERT_EQ(0x100, msg);
2134 EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid));
2136 /* Might as well check siginfo for sanity while we're here. */
2137 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2138 ASSERT_EQ(SIGTRAP, info.si_signo);
2139 ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
2140 EXPECT_EQ(0, info.si_errno);
2141 EXPECT_EQ(getuid(), info.si_uid);
2142 /* Verify signal delivery came from child (seccomp-triggered). */
2143 EXPECT_EQ(child_pid, info.si_pid);
2145 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
2146 ASSERT_EQ(0, kill(child_pid, SIGSTOP));
2147 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2148 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2149 ASSERT_EQ(true, WIFSTOPPED(status));
2150 ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
2151 /* Verify signal delivery came from parent now. */
2152 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2153 EXPECT_EQ(getpid(), info.si_pid);
2155 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
2156 ASSERT_EQ(0, kill(child_pid, SIGCONT));
2157 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2158 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2159 ASSERT_EQ(true, WIFSTOPPED(status));
2160 ASSERT_EQ(SIGCONT, WSTOPSIG(status));
2161 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2163 /* Wait for restart_syscall() to start. */
2164 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2165 ASSERT_EQ(true, WIFSTOPPED(status));
2166 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2167 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2168 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2170 ASSERT_EQ(0x200, msg);
2171 ret = get_syscall(_metadata, child_pid);
2172 #if defined(__arm__)
2175 * - native ARM registers do NOT expose true syscall.
2176 * - compat ARM registers on ARM64 DO expose true syscall.
2178 ASSERT_EQ(0, uname(&utsbuf));
2179 if (strncmp(utsbuf.machine, "arm", 3) == 0) {
2180 EXPECT_EQ(__NR_nanosleep, ret);
2184 EXPECT_EQ(__NR_restart_syscall, ret);
2187 /* Write again to end test. */
2188 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2189 ASSERT_EQ(1, write(pipefd[1], "!", 1));
2190 EXPECT_EQ(0, close(pipefd[1]));
2192 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2193 if (WIFSIGNALED(status) || WEXITSTATUS(status))
2194 _metadata->passed = 0;
2199 * - add microbenchmarks
2200 * - expand NNP testing
2201 * - better arch-specific TRACE and TRAP handlers.
2202 * - endianness checking when appropriate
2203 * - 64-bit arg prodding
2204 * - arch value testing (x86 modes especially)