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();
495 int page_size = sysconf(_SC_PAGESIZE);
497 ASSERT_LT(0, page_size);
499 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
502 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
505 fd = open("/dev/zero", O_RDONLY);
508 EXPECT_EQ(parent, syscall(__NR_getppid));
509 map1 = (void *)syscall(sysno,
510 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
511 EXPECT_NE(MAP_FAILED, map1);
512 /* mmap2() should never return. */
513 map2 = (void *)syscall(sysno,
514 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
515 EXPECT_EQ(MAP_FAILED, map2);
517 /* The test failed, so clean up the resources. */
518 munmap(map1, page_size);
519 munmap(map2, page_size);
523 /* TODO(wad) add 64-bit versus 32-bit arg tests. */
524 TEST(arg_out_of_range)
526 struct sock_filter filter[] = {
527 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
528 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
530 struct sock_fprog prog = {
531 .len = (unsigned short)ARRAY_SIZE(filter),
536 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
539 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
541 EXPECT_EQ(EINVAL, errno);
546 struct sock_filter filter[] = {
547 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
548 offsetof(struct seccomp_data, nr)),
549 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
550 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | E2BIG),
551 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
553 struct sock_fprog prog = {
554 .len = (unsigned short)ARRAY_SIZE(filter),
558 pid_t parent = getppid();
560 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
563 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
566 EXPECT_EQ(parent, syscall(__NR_getppid));
567 EXPECT_EQ(-1, read(0, NULL, 0));
568 EXPECT_EQ(E2BIG, errno);
573 struct sock_filter filter[] = {
574 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
575 offsetof(struct seccomp_data, nr)),
576 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
577 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | 0),
578 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
580 struct sock_fprog prog = {
581 .len = (unsigned short)ARRAY_SIZE(filter),
585 pid_t parent = getppid();
587 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
590 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
593 EXPECT_EQ(parent, syscall(__NR_getppid));
594 /* "errno" of 0 is ok. */
595 EXPECT_EQ(0, read(0, NULL, 0));
600 struct sock_filter filter[] = {
601 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
602 offsetof(struct seccomp_data, nr)),
603 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
604 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | 4096),
605 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
607 struct sock_fprog prog = {
608 .len = (unsigned short)ARRAY_SIZE(filter),
612 pid_t parent = getppid();
614 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
617 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
620 EXPECT_EQ(parent, syscall(__NR_getppid));
621 EXPECT_EQ(-1, read(0, NULL, 0));
622 EXPECT_EQ(4095, errno);
626 struct sock_fprog prog;
631 struct sock_filter filter[] = {
632 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
633 offsetof(struct seccomp_data, nr)),
634 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
635 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
636 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
639 memset(&self->prog, 0, sizeof(self->prog));
640 self->prog.filter = malloc(sizeof(filter));
641 ASSERT_NE(NULL, self->prog.filter);
642 memcpy(self->prog.filter, filter, sizeof(filter));
643 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
646 FIXTURE_TEARDOWN(TRAP)
648 if (self->prog.filter)
649 free(self->prog.filter);
652 TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
656 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
659 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
661 syscall(__NR_getpid);
664 /* Ensure that SIGSYS overrides SIG_IGN */
665 TEST_F_SIGNAL(TRAP, ign, SIGSYS)
669 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
672 signal(SIGSYS, SIG_IGN);
674 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
676 syscall(__NR_getpid);
679 static struct siginfo TRAP_info;
680 static volatile int TRAP_nr;
681 static void TRAP_action(int nr, siginfo_t *info, void *void_context)
683 memcpy(&TRAP_info, info, sizeof(TRAP_info));
687 TEST_F(TRAP, handler)
690 struct sigaction act;
693 memset(&act, 0, sizeof(act));
695 sigaddset(&mask, SIGSYS);
697 act.sa_sigaction = &TRAP_action;
698 act.sa_flags = SA_SIGINFO;
699 ret = sigaction(SIGSYS, &act, NULL);
701 TH_LOG("sigaction failed");
703 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
705 TH_LOG("sigprocmask failed");
708 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
710 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
713 memset(&TRAP_info, 0, sizeof(TRAP_info));
714 /* Expect the registers to be rolled back. (nr = error) may vary
716 ret = syscall(__NR_getpid);
717 /* Silence gcc warning about volatile. */
719 EXPECT_EQ(SIGSYS, test);
720 struct local_sigsys {
721 void *_call_addr; /* calling user insn */
722 int _syscall; /* triggering system call number */
723 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
724 } *sigsys = (struct local_sigsys *)
726 &(TRAP_info.si_call_addr);
730 EXPECT_EQ(__NR_getpid, sigsys->_syscall);
731 /* Make sure arch is non-zero. */
732 EXPECT_NE(0, sigsys->_arch);
733 EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
736 FIXTURE_DATA(precedence) {
737 struct sock_fprog allow;
738 struct sock_fprog trace;
739 struct sock_fprog error;
740 struct sock_fprog trap;
741 struct sock_fprog kill;
744 FIXTURE_SETUP(precedence)
746 struct sock_filter allow_insns[] = {
747 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
749 struct sock_filter trace_insns[] = {
750 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
751 offsetof(struct seccomp_data, nr)),
752 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
753 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
754 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
756 struct sock_filter error_insns[] = {
757 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
758 offsetof(struct seccomp_data, nr)),
759 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
760 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
761 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
763 struct sock_filter trap_insns[] = {
764 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
765 offsetof(struct seccomp_data, nr)),
766 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
767 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
768 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
770 struct sock_filter kill_insns[] = {
771 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
772 offsetof(struct seccomp_data, nr)),
773 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
774 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
775 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
778 memset(self, 0, sizeof(*self));
779 #define FILTER_ALLOC(_x) \
780 self->_x.filter = malloc(sizeof(_x##_insns)); \
781 ASSERT_NE(NULL, self->_x.filter); \
782 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
783 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
791 FIXTURE_TEARDOWN(precedence)
793 #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
801 TEST_F(precedence, allow_ok)
803 pid_t parent, res = 0;
807 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
810 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
812 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
814 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
816 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
818 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
820 /* Should work just fine. */
821 res = syscall(__NR_getppid);
822 EXPECT_EQ(parent, res);
825 TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
827 pid_t parent, res = 0;
831 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
834 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
836 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
838 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
840 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
842 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
844 /* Should work just fine. */
845 res = syscall(__NR_getppid);
846 EXPECT_EQ(parent, res);
847 /* getpid() should never return. */
848 res = syscall(__NR_getpid);
852 TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
858 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
861 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
863 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
865 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
867 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
869 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
871 /* Should work just fine. */
872 EXPECT_EQ(parent, syscall(__NR_getppid));
873 /* getpid() should never return. */
874 EXPECT_EQ(0, syscall(__NR_getpid));
877 TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
883 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
886 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
888 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
890 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
892 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
894 /* Should work just fine. */
895 EXPECT_EQ(parent, syscall(__NR_getppid));
896 /* getpid() should never return. */
897 EXPECT_EQ(0, syscall(__NR_getpid));
900 TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
906 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
909 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
911 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
913 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
915 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
917 /* Should work just fine. */
918 EXPECT_EQ(parent, syscall(__NR_getppid));
919 /* getpid() should never return. */
920 EXPECT_EQ(0, syscall(__NR_getpid));
923 TEST_F(precedence, errno_is_third)
929 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
932 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
934 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
936 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
938 /* Should work just fine. */
939 EXPECT_EQ(parent, syscall(__NR_getppid));
940 EXPECT_EQ(0, syscall(__NR_getpid));
943 TEST_F(precedence, errno_is_third_in_any_order)
949 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
952 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
954 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
956 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
958 /* Should work just fine. */
959 EXPECT_EQ(parent, syscall(__NR_getppid));
960 EXPECT_EQ(0, syscall(__NR_getpid));
963 TEST_F(precedence, trace_is_fourth)
969 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
972 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
974 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
976 /* Should work just fine. */
977 EXPECT_EQ(parent, syscall(__NR_getppid));
979 EXPECT_EQ(-1, syscall(__NR_getpid));
982 TEST_F(precedence, trace_is_fourth_in_any_order)
988 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
991 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
993 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
995 /* Should work just fine. */
996 EXPECT_EQ(parent, syscall(__NR_getppid));
998 EXPECT_EQ(-1, syscall(__NR_getpid));
1001 #ifndef PTRACE_O_TRACESECCOMP
1002 #define PTRACE_O_TRACESECCOMP 0x00000080
1005 /* Catch the Ubuntu 12.04 value error. */
1006 #if PTRACE_EVENT_SECCOMP != 7
1007 #undef PTRACE_EVENT_SECCOMP
1010 #ifndef PTRACE_EVENT_SECCOMP
1011 #define PTRACE_EVENT_SECCOMP 7
1014 #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1015 bool tracer_running;
1016 void tracer_stop(int sig)
1018 tracer_running = false;
1021 typedef void tracer_func_t(struct __test_metadata *_metadata,
1022 pid_t tracee, int status, void *args);
1024 void tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
1025 tracer_func_t tracer_func, void *args)
1028 struct sigaction action = {
1029 .sa_handler = tracer_stop,
1032 /* Allow external shutdown. */
1033 tracer_running = true;
1034 ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
1037 while (ret == -1 && errno != EINVAL)
1038 ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
1040 kill(tracee, SIGKILL);
1042 /* Wait for attach stop */
1045 ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, PTRACE_O_TRACESECCOMP);
1047 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1048 kill(tracee, SIGKILL);
1050 ptrace(PTRACE_CONT, tracee, NULL, 0);
1052 /* Unblock the tracee */
1053 ASSERT_EQ(1, write(fd, "A", 1));
1054 ASSERT_EQ(0, close(fd));
1056 /* Run until we're shut down. Must assert to stop execution. */
1057 while (tracer_running) {
1060 if (wait(&status) != tracee)
1062 if (WIFSIGNALED(status) || WIFEXITED(status))
1063 /* Child is dead. Time to go. */
1066 /* Make sure this is a seccomp event. */
1067 ASSERT_EQ(true, IS_SECCOMP_EVENT(status));
1069 tracer_func(_metadata, tracee, status, args);
1071 ret = ptrace(PTRACE_CONT, tracee, NULL, NULL);
1074 /* Directly report the status of our test harness results. */
1075 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
1078 /* Common tracer setup/teardown functions. */
1079 void cont_handler(int num)
1081 pid_t setup_trace_fixture(struct __test_metadata *_metadata,
1082 tracer_func_t func, void *args)
1087 pid_t tracee = getpid();
1089 /* Setup a pipe for clean synchronization. */
1090 ASSERT_EQ(0, pipe(pipefd));
1092 /* Fork a child which we'll promote to tracer */
1093 tracer_pid = fork();
1094 ASSERT_LE(0, tracer_pid);
1095 signal(SIGALRM, cont_handler);
1096 if (tracer_pid == 0) {
1098 tracer(_metadata, pipefd[1], tracee, func, args);
1099 syscall(__NR_exit, 0);
1102 prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
1103 read(pipefd[0], &sync, 1);
1108 void teardown_trace_fixture(struct __test_metadata *_metadata,
1114 * Extract the exit code from the other process and
1115 * adopt it for ourselves in case its asserts failed.
1117 ASSERT_EQ(0, kill(tracer, SIGUSR1));
1118 ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
1119 if (WEXITSTATUS(status))
1120 _metadata->passed = 0;
1124 /* "poke" tracer arguments and function. */
1125 struct tracer_args_poke_t {
1126 unsigned long poke_addr;
1129 void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
1134 struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
1136 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1138 /* If this fails, don't try to recover. */
1139 ASSERT_EQ(0x1001, msg) {
1140 kill(tracee, SIGKILL);
1143 * Poke in the message.
1144 * Registers are not touched to try to keep this relatively arch
1147 ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
1151 FIXTURE_DATA(TRACE_poke) {
1152 struct sock_fprog prog;
1155 struct tracer_args_poke_t tracer_args;
1158 FIXTURE_SETUP(TRACE_poke)
1160 struct sock_filter filter[] = {
1161 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1162 offsetof(struct seccomp_data, nr)),
1163 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1164 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
1165 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1169 memset(&self->prog, 0, sizeof(self->prog));
1170 self->prog.filter = malloc(sizeof(filter));
1171 ASSERT_NE(NULL, self->prog.filter);
1172 memcpy(self->prog.filter, filter, sizeof(filter));
1173 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1175 /* Set up tracer args. */
1176 self->tracer_args.poke_addr = (unsigned long)&self->poked;
1178 /* Launch tracer. */
1179 self->tracer = setup_trace_fixture(_metadata, tracer_poke,
1180 &self->tracer_args);
1183 FIXTURE_TEARDOWN(TRACE_poke)
1185 teardown_trace_fixture(_metadata, self->tracer);
1186 if (self->prog.filter)
1187 free(self->prog.filter);
1190 TEST_F(TRACE_poke, read_has_side_effects)
1194 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1197 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1200 EXPECT_EQ(0, self->poked);
1201 ret = read(-1, NULL, 0);
1203 EXPECT_EQ(0x1001, self->poked);
1206 TEST_F(TRACE_poke, getpid_runs_normally)
1210 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1213 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1216 EXPECT_EQ(0, self->poked);
1217 EXPECT_NE(0, syscall(__NR_getpid));
1218 EXPECT_EQ(0, self->poked);
1221 #if defined(__x86_64__)
1222 # define ARCH_REGS struct user_regs_struct
1223 # define SYSCALL_NUM orig_rax
1224 # define SYSCALL_RET rax
1225 #elif defined(__i386__)
1226 # define ARCH_REGS struct user_regs_struct
1227 # define SYSCALL_NUM orig_eax
1228 # define SYSCALL_RET eax
1229 #elif defined(__arm__)
1230 # define ARCH_REGS struct pt_regs
1231 # define SYSCALL_NUM ARM_r7
1232 # define SYSCALL_RET ARM_r0
1233 #elif defined(__aarch64__)
1234 # define ARCH_REGS struct user_pt_regs
1235 # define SYSCALL_NUM regs[8]
1236 # define SYSCALL_RET regs[0]
1237 #elif defined(__powerpc__)
1238 # define ARCH_REGS struct pt_regs
1239 # define SYSCALL_NUM gpr[0]
1240 # define SYSCALL_RET gpr[3]
1241 #elif defined(__s390__)
1242 # define ARCH_REGS s390_regs
1243 # define SYSCALL_NUM gprs[2]
1244 # define SYSCALL_RET gprs[2]
1246 # error "Do not know how to find your architecture's registers and syscalls"
1249 /* Architecture-specific syscall fetching routine. */
1250 int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
1255 iov.iov_base = ®s;
1256 iov.iov_len = sizeof(regs);
1257 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
1258 TH_LOG("PTRACE_GETREGSET failed");
1262 return regs.SYSCALL_NUM;
1265 /* Architecture-specific syscall changing routine. */
1266 void change_syscall(struct __test_metadata *_metadata,
1267 pid_t tracee, int syscall)
1273 iov.iov_base = ®s;
1274 iov.iov_len = sizeof(regs);
1275 ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
1278 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1281 regs.SYSCALL_NUM = syscall;
1284 #elif defined(__arm__)
1285 # ifndef PTRACE_SET_SYSCALL
1286 # define PTRACE_SET_SYSCALL 23
1289 ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
1293 #elif defined(__aarch64__)
1294 # ifndef NT_ARM_SYSTEM_CALL
1295 # define NT_ARM_SYSTEM_CALL 0x404
1298 iov.iov_base = &syscall;
1299 iov.iov_len = sizeof(syscall);
1300 ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
1307 TH_LOG("How is the syscall changed on this architecture?");
1311 /* If syscall is skipped, change return value. */
1313 regs.SYSCALL_RET = 1;
1315 iov.iov_base = ®s;
1316 iov.iov_len = sizeof(regs);
1317 ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
1321 void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
1322 int status, void *args)
1327 /* Make sure we got the right message. */
1328 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1331 /* Validate and take action on expected syscalls. */
1334 /* change getpid to getppid. */
1335 EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
1336 change_syscall(_metadata, tracee, __NR_getppid);
1340 EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
1341 change_syscall(_metadata, tracee, -1);
1344 /* do nothing (allow getppid) */
1345 EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
1349 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
1350 kill(tracee, SIGKILL);
1356 FIXTURE_DATA(TRACE_syscall) {
1357 struct sock_fprog prog;
1358 pid_t tracer, mytid, mypid, parent;
1361 FIXTURE_SETUP(TRACE_syscall)
1363 struct sock_filter filter[] = {
1364 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1365 offsetof(struct seccomp_data, nr)),
1366 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1367 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
1368 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
1369 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
1370 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1371 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
1372 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1375 memset(&self->prog, 0, sizeof(self->prog));
1376 self->prog.filter = malloc(sizeof(filter));
1377 ASSERT_NE(NULL, self->prog.filter);
1378 memcpy(self->prog.filter, filter, sizeof(filter));
1379 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1381 /* Prepare some testable syscall results. */
1382 self->mytid = syscall(__NR_gettid);
1383 ASSERT_GT(self->mytid, 0);
1384 ASSERT_NE(self->mytid, 1) {
1385 TH_LOG("Running this test as init is not supported. :)");
1388 self->mypid = getpid();
1389 ASSERT_GT(self->mypid, 0);
1390 ASSERT_EQ(self->mytid, self->mypid);
1392 self->parent = getppid();
1393 ASSERT_GT(self->parent, 0);
1394 ASSERT_NE(self->parent, self->mypid);
1396 /* Launch tracer. */
1397 self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL);
1400 FIXTURE_TEARDOWN(TRACE_syscall)
1402 teardown_trace_fixture(_metadata, self->tracer);
1403 if (self->prog.filter)
1404 free(self->prog.filter);
1407 TEST_F(TRACE_syscall, syscall_allowed)
1411 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1414 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1417 /* getppid works as expected (no changes). */
1418 EXPECT_EQ(self->parent, syscall(__NR_getppid));
1419 EXPECT_NE(self->mypid, syscall(__NR_getppid));
1422 TEST_F(TRACE_syscall, syscall_redirected)
1426 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1429 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1432 /* getpid has been redirected to getppid as expected. */
1433 EXPECT_EQ(self->parent, syscall(__NR_getpid));
1434 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1437 TEST_F(TRACE_syscall, syscall_dropped)
1441 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1444 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1447 /* gettid has been skipped and an altered return value stored. */
1448 EXPECT_EQ(1, syscall(__NR_gettid));
1449 EXPECT_NE(self->mytid, syscall(__NR_gettid));
1452 #ifndef __NR_seccomp
1453 # if defined(__i386__)
1454 # define __NR_seccomp 354
1455 # elif defined(__x86_64__)
1456 # define __NR_seccomp 317
1457 # elif defined(__arm__)
1458 # define __NR_seccomp 383
1459 # elif defined(__aarch64__)
1460 # define __NR_seccomp 277
1461 # elif defined(__powerpc__)
1462 # define __NR_seccomp 358
1463 # elif defined(__s390__)
1464 # define __NR_seccomp 348
1466 # warning "seccomp syscall number unknown for this architecture"
1467 # define __NR_seccomp 0xffff
1471 #ifndef SECCOMP_SET_MODE_STRICT
1472 #define SECCOMP_SET_MODE_STRICT 0
1475 #ifndef SECCOMP_SET_MODE_FILTER
1476 #define SECCOMP_SET_MODE_FILTER 1
1479 #ifndef SECCOMP_FILTER_FLAG_TSYNC
1480 #define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0)
1483 #ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW
1484 #define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2)
1488 int seccomp(unsigned int op, unsigned int flags, void *args)
1491 return syscall(__NR_seccomp, op, flags, args);
1495 TEST(seccomp_syscall)
1497 struct sock_filter filter[] = {
1498 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1500 struct sock_fprog prog = {
1501 .len = (unsigned short)ARRAY_SIZE(filter),
1506 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1508 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1511 /* Reject insane operation. */
1512 ret = seccomp(-1, 0, &prog);
1513 ASSERT_NE(ENOSYS, errno) {
1514 TH_LOG("Kernel does not support seccomp syscall!");
1516 EXPECT_EQ(EINVAL, errno) {
1517 TH_LOG("Did not reject crazy op value!");
1520 /* Reject strict with flags or pointer. */
1521 ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
1522 EXPECT_EQ(EINVAL, errno) {
1523 TH_LOG("Did not reject mode strict with flags!");
1525 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
1526 EXPECT_EQ(EINVAL, errno) {
1527 TH_LOG("Did not reject mode strict with uargs!");
1530 /* Reject insane args for filter. */
1531 ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
1532 EXPECT_EQ(EINVAL, errno) {
1533 TH_LOG("Did not reject crazy filter flags!");
1535 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
1536 EXPECT_EQ(EFAULT, errno) {
1537 TH_LOG("Did not reject NULL filter!");
1540 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1541 EXPECT_EQ(0, errno) {
1542 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
1547 TEST(seccomp_syscall_mode_lock)
1549 struct sock_filter filter[] = {
1550 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1552 struct sock_fprog prog = {
1553 .len = (unsigned short)ARRAY_SIZE(filter),
1558 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
1560 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1563 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1564 ASSERT_NE(ENOSYS, errno) {
1565 TH_LOG("Kernel does not support seccomp syscall!");
1568 TH_LOG("Could not install filter!");
1571 /* Make sure neither entry point will switch to strict. */
1572 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
1573 EXPECT_EQ(EINVAL, errno) {
1574 TH_LOG("Switched to mode strict!");
1577 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
1578 EXPECT_EQ(EINVAL, errno) {
1579 TH_LOG("Switched to mode strict!");
1584 * Test detection of known and unknown filter flags. Userspace needs to be able
1585 * to check if a filter flag is supported by the current kernel and a good way
1586 * of doing that is by attempting to enter filter mode, with the flag bit in
1587 * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
1588 * that the flag is valid and EINVAL indicates that the flag is invalid.
1590 TEST(detect_seccomp_filter_flags)
1592 unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC,
1593 SECCOMP_FILTER_FLAG_SPEC_ALLOW };
1594 unsigned int flag, all_flags;
1598 /* Test detection of known-good filter flags */
1599 for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) {
1603 /* Make sure the flag is a single bit! */
1612 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
1613 ASSERT_NE(ENOSYS, errno) {
1614 TH_LOG("Kernel does not support seccomp syscall!");
1617 EXPECT_EQ(EFAULT, errno) {
1618 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
1625 /* Test detection of all known-good filter flags */
1626 ret = seccomp(SECCOMP_SET_MODE_FILTER, all_flags, NULL);
1628 EXPECT_EQ(EFAULT, errno) {
1629 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
1633 /* Test detection of an unknown filter flag */
1635 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
1637 EXPECT_EQ(EINVAL, errno) {
1638 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
1643 * Test detection of an unknown filter flag that may simply need to be
1644 * added to this test
1646 flag = flags[ARRAY_SIZE(flags) - 1] << 1;
1647 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
1649 EXPECT_EQ(EINVAL, errno) {
1650 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?",
1657 struct sock_filter filter[] = {
1658 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1660 struct sock_fprog prog = {
1661 .len = (unsigned short)ARRAY_SIZE(filter),
1666 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
1668 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1671 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
1673 ASSERT_NE(ENOSYS, errno) {
1674 TH_LOG("Kernel does not support seccomp syscall!");
1677 TH_LOG("Could not install initial filter with TSYNC!");
1681 #define TSYNC_SIBLINGS 2
1682 struct tsync_sibling {
1686 pthread_cond_t *cond;
1687 pthread_mutex_t *mutex;
1690 struct sock_fprog *prog;
1691 struct __test_metadata *metadata;
1694 FIXTURE_DATA(TSYNC) {
1695 struct sock_fprog root_prog, apply_prog;
1696 struct tsync_sibling sibling[TSYNC_SIBLINGS];
1698 pthread_cond_t cond;
1699 pthread_mutex_t mutex;
1703 FIXTURE_SETUP(TSYNC)
1705 struct sock_filter root_filter[] = {
1706 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1708 struct sock_filter apply_filter[] = {
1709 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1710 offsetof(struct seccomp_data, nr)),
1711 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1712 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1713 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1716 memset(&self->root_prog, 0, sizeof(self->root_prog));
1717 memset(&self->apply_prog, 0, sizeof(self->apply_prog));
1718 memset(&self->sibling, 0, sizeof(self->sibling));
1719 self->root_prog.filter = malloc(sizeof(root_filter));
1720 ASSERT_NE(NULL, self->root_prog.filter);
1721 memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
1722 self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
1724 self->apply_prog.filter = malloc(sizeof(apply_filter));
1725 ASSERT_NE(NULL, self->apply_prog.filter);
1726 memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
1727 self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
1729 self->sibling_count = 0;
1730 pthread_mutex_init(&self->mutex, NULL);
1731 pthread_cond_init(&self->cond, NULL);
1732 sem_init(&self->started, 0, 0);
1733 self->sibling[0].tid = 0;
1734 self->sibling[0].cond = &self->cond;
1735 self->sibling[0].started = &self->started;
1736 self->sibling[0].mutex = &self->mutex;
1737 self->sibling[0].diverge = 0;
1738 self->sibling[0].num_waits = 1;
1739 self->sibling[0].prog = &self->root_prog;
1740 self->sibling[0].metadata = _metadata;
1741 self->sibling[1].tid = 0;
1742 self->sibling[1].cond = &self->cond;
1743 self->sibling[1].started = &self->started;
1744 self->sibling[1].mutex = &self->mutex;
1745 self->sibling[1].diverge = 0;
1746 self->sibling[1].prog = &self->root_prog;
1747 self->sibling[1].num_waits = 1;
1748 self->sibling[1].metadata = _metadata;
1751 FIXTURE_TEARDOWN(TSYNC)
1755 if (self->root_prog.filter)
1756 free(self->root_prog.filter);
1757 if (self->apply_prog.filter)
1758 free(self->apply_prog.filter);
1760 for ( ; sib < self->sibling_count; ++sib) {
1761 struct tsync_sibling *s = &self->sibling[sib];
1766 if (pthread_kill(s->tid, 0)) {
1767 pthread_cancel(s->tid);
1768 pthread_join(s->tid, &status);
1771 pthread_mutex_destroy(&self->mutex);
1772 pthread_cond_destroy(&self->cond);
1773 sem_destroy(&self->started);
1776 void *tsync_sibling(void *data)
1779 struct tsync_sibling *me = data;
1781 me->system_tid = syscall(__NR_gettid);
1783 pthread_mutex_lock(me->mutex);
1785 /* Just re-apply the root prog to fork the tree */
1786 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
1789 sem_post(me->started);
1790 /* Return outside of started so parent notices failures. */
1792 pthread_mutex_unlock(me->mutex);
1793 return (void *)SIBLING_EXIT_FAILURE;
1796 pthread_cond_wait(me->cond, me->mutex);
1797 me->num_waits = me->num_waits - 1;
1798 } while (me->num_waits);
1799 pthread_mutex_unlock(me->mutex);
1801 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
1803 return (void *)SIBLING_EXIT_NEWPRIVS;
1805 return (void *)SIBLING_EXIT_UNKILLED;
1808 void tsync_start_sibling(struct tsync_sibling *sibling)
1810 pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
1813 TEST_F(TSYNC, siblings_fail_prctl)
1817 struct sock_filter filter[] = {
1818 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1819 offsetof(struct seccomp_data, nr)),
1820 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
1821 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
1822 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1824 struct sock_fprog prog = {
1825 .len = (unsigned short)ARRAY_SIZE(filter),
1829 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1830 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1833 /* Check prctl failure detection by requesting sib 0 diverge. */
1834 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
1835 ASSERT_NE(ENOSYS, errno) {
1836 TH_LOG("Kernel does not support seccomp syscall!");
1839 TH_LOG("setting filter failed");
1842 self->sibling[0].diverge = 1;
1843 tsync_start_sibling(&self->sibling[0]);
1844 tsync_start_sibling(&self->sibling[1]);
1846 while (self->sibling_count < TSYNC_SIBLINGS) {
1847 sem_wait(&self->started);
1848 self->sibling_count++;
1851 /* Signal the threads to clean up*/
1852 pthread_mutex_lock(&self->mutex);
1853 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1854 TH_LOG("cond broadcast non-zero");
1856 pthread_mutex_unlock(&self->mutex);
1858 /* Ensure diverging sibling failed to call prctl. */
1859 pthread_join(self->sibling[0].tid, &status);
1860 EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
1861 pthread_join(self->sibling[1].tid, &status);
1862 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
1865 TEST_F(TSYNC, two_siblings_with_ancestor)
1870 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1871 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1874 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
1875 ASSERT_NE(ENOSYS, errno) {
1876 TH_LOG("Kernel does not support seccomp syscall!");
1879 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
1881 tsync_start_sibling(&self->sibling[0]);
1882 tsync_start_sibling(&self->sibling[1]);
1884 while (self->sibling_count < TSYNC_SIBLINGS) {
1885 sem_wait(&self->started);
1886 self->sibling_count++;
1889 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
1892 TH_LOG("Could install filter on all threads!");
1894 /* Tell the siblings to test the policy */
1895 pthread_mutex_lock(&self->mutex);
1896 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1897 TH_LOG("cond broadcast non-zero");
1899 pthread_mutex_unlock(&self->mutex);
1900 /* Ensure they are both killed and don't exit cleanly. */
1901 pthread_join(self->sibling[0].tid, &status);
1902 EXPECT_EQ(0x0, (long)status);
1903 pthread_join(self->sibling[1].tid, &status);
1904 EXPECT_EQ(0x0, (long)status);
1907 TEST_F(TSYNC, two_sibling_want_nnp)
1911 /* start siblings before any prctl() operations */
1912 tsync_start_sibling(&self->sibling[0]);
1913 tsync_start_sibling(&self->sibling[1]);
1914 while (self->sibling_count < TSYNC_SIBLINGS) {
1915 sem_wait(&self->started);
1916 self->sibling_count++;
1919 /* Tell the siblings to test no policy */
1920 pthread_mutex_lock(&self->mutex);
1921 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1922 TH_LOG("cond broadcast non-zero");
1924 pthread_mutex_unlock(&self->mutex);
1926 /* Ensure they are both upset about lacking nnp. */
1927 pthread_join(self->sibling[0].tid, &status);
1928 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
1929 pthread_join(self->sibling[1].tid, &status);
1930 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
1933 TEST_F(TSYNC, two_siblings_with_no_filter)
1938 /* start siblings before any prctl() operations */
1939 tsync_start_sibling(&self->sibling[0]);
1940 tsync_start_sibling(&self->sibling[1]);
1941 while (self->sibling_count < TSYNC_SIBLINGS) {
1942 sem_wait(&self->started);
1943 self->sibling_count++;
1946 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1947 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1950 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
1952 ASSERT_NE(ENOSYS, errno) {
1953 TH_LOG("Kernel does not support seccomp syscall!");
1956 TH_LOG("Could install filter on all threads!");
1959 /* Tell the siblings to test the policy */
1960 pthread_mutex_lock(&self->mutex);
1961 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
1962 TH_LOG("cond broadcast non-zero");
1964 pthread_mutex_unlock(&self->mutex);
1966 /* Ensure they are both killed and don't exit cleanly. */
1967 pthread_join(self->sibling[0].tid, &status);
1968 EXPECT_EQ(0x0, (long)status);
1969 pthread_join(self->sibling[1].tid, &status);
1970 EXPECT_EQ(0x0, (long)status);
1973 TEST_F(TSYNC, two_siblings_with_one_divergence)
1978 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
1979 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1982 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
1983 ASSERT_NE(ENOSYS, errno) {
1984 TH_LOG("Kernel does not support seccomp syscall!");
1987 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
1989 self->sibling[0].diverge = 1;
1990 tsync_start_sibling(&self->sibling[0]);
1991 tsync_start_sibling(&self->sibling[1]);
1993 while (self->sibling_count < TSYNC_SIBLINGS) {
1994 sem_wait(&self->started);
1995 self->sibling_count++;
1998 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2000 ASSERT_EQ(self->sibling[0].system_tid, ret) {
2001 TH_LOG("Did not fail on diverged sibling.");
2004 /* Wake the threads */
2005 pthread_mutex_lock(&self->mutex);
2006 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2007 TH_LOG("cond broadcast non-zero");
2009 pthread_mutex_unlock(&self->mutex);
2011 /* Ensure they are both unkilled. */
2012 pthread_join(self->sibling[0].tid, &status);
2013 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2014 pthread_join(self->sibling[1].tid, &status);
2015 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2018 TEST_F(TSYNC, two_siblings_not_under_filter)
2023 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2024 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2028 * Sibling 0 will have its own seccomp policy
2029 * and Sibling 1 will not be under seccomp at
2030 * all. Sibling 1 will enter seccomp and 0
2031 * will cause failure.
2033 self->sibling[0].diverge = 1;
2034 tsync_start_sibling(&self->sibling[0]);
2035 tsync_start_sibling(&self->sibling[1]);
2037 while (self->sibling_count < TSYNC_SIBLINGS) {
2038 sem_wait(&self->started);
2039 self->sibling_count++;
2042 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2043 ASSERT_NE(ENOSYS, errno) {
2044 TH_LOG("Kernel does not support seccomp syscall!");
2047 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2050 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2052 ASSERT_EQ(ret, self->sibling[0].system_tid) {
2053 TH_LOG("Did not fail on diverged sibling.");
2056 if (ret == self->sibling[0].system_tid)
2059 pthread_mutex_lock(&self->mutex);
2061 /* Increment the other siblings num_waits so we can clean up
2062 * the one we just saw.
2064 self->sibling[!sib].num_waits += 1;
2066 /* Signal the thread to clean up*/
2067 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2068 TH_LOG("cond broadcast non-zero");
2070 pthread_mutex_unlock(&self->mutex);
2071 pthread_join(self->sibling[sib].tid, &status);
2072 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2073 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2074 while (!kill(self->sibling[sib].system_tid, 0))
2076 /* Switch to the remaining sibling */
2079 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2082 TH_LOG("Expected the remaining sibling to sync");
2085 pthread_mutex_lock(&self->mutex);
2087 /* If remaining sibling didn't have a chance to wake up during
2088 * the first broadcast, manually reduce the num_waits now.
2090 if (self->sibling[sib].num_waits > 1)
2091 self->sibling[sib].num_waits = 1;
2092 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2093 TH_LOG("cond broadcast non-zero");
2095 pthread_mutex_unlock(&self->mutex);
2096 pthread_join(self->sibling[sib].tid, &status);
2097 EXPECT_EQ(0, (long)status);
2098 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2099 while (!kill(self->sibling[sib].system_tid, 0))
2102 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
2104 ASSERT_EQ(0, ret); /* just us chickens */
2107 /* Make sure restarted syscalls are seen directly as "restart_syscall". */
2108 TEST(syscall_restart)
2115 siginfo_t info = { };
2116 struct sock_filter filter[] = {
2117 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2118 offsetof(struct seccomp_data, nr)),
2120 #ifdef __NR_sigreturn
2121 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0),
2123 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0),
2124 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0),
2125 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0),
2126 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0),
2127 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
2129 /* Allow __NR_write for easy logging. */
2130 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
2131 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2132 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2133 /* The nanosleep jump target. */
2134 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
2135 /* The restart_syscall jump target. */
2136 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
2138 struct sock_fprog prog = {
2139 .len = (unsigned short)ARRAY_SIZE(filter),
2142 #if defined(__arm__)
2143 struct utsname utsbuf;
2146 ASSERT_EQ(0, pipe(pipefd));
2149 ASSERT_LE(0, child_pid);
2150 if (child_pid == 0) {
2151 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2153 struct timespec timeout = { };
2155 /* Attach parent as tracer and stop. */
2156 EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
2157 EXPECT_EQ(0, raise(SIGSTOP));
2159 EXPECT_EQ(0, close(pipefd[1]));
2161 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2162 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2165 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2167 TH_LOG("Failed to install filter!");
2170 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2171 TH_LOG("Failed to read() sync from parent");
2173 EXPECT_EQ('.', buf) {
2174 TH_LOG("Failed to get sync data from read()");
2177 /* Start nanosleep to be interrupted. */
2180 EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
2181 TH_LOG("Call to nanosleep() failed (errno %d)", errno);
2184 /* Read final sync from parent. */
2185 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2186 TH_LOG("Failed final read() from parent");
2188 EXPECT_EQ('!', buf) {
2189 TH_LOG("Failed to get final data from read()");
2192 /* Directly report the status of our test harness results. */
2193 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
2196 EXPECT_EQ(0, close(pipefd[0]));
2198 /* Attach to child, setup options, and release. */
2199 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2200 ASSERT_EQ(true, WIFSTOPPED(status));
2201 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
2202 PTRACE_O_TRACESECCOMP));
2203 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2204 ASSERT_EQ(1, write(pipefd[1], ".", 1));
2206 /* Wait for nanosleep() to start. */
2207 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2208 ASSERT_EQ(true, WIFSTOPPED(status));
2209 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2210 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2211 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2212 ASSERT_EQ(0x100, msg);
2213 EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid));
2215 /* Might as well check siginfo for sanity while we're here. */
2216 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2217 ASSERT_EQ(SIGTRAP, info.si_signo);
2218 ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
2219 EXPECT_EQ(0, info.si_errno);
2220 EXPECT_EQ(getuid(), info.si_uid);
2221 /* Verify signal delivery came from child (seccomp-triggered). */
2222 EXPECT_EQ(child_pid, info.si_pid);
2224 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
2225 ASSERT_EQ(0, kill(child_pid, SIGSTOP));
2226 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2227 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2228 ASSERT_EQ(true, WIFSTOPPED(status));
2229 ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
2230 /* Verify signal delivery came from parent now. */
2231 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2232 EXPECT_EQ(getpid(), info.si_pid);
2234 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
2235 ASSERT_EQ(0, kill(child_pid, SIGCONT));
2236 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2237 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2238 ASSERT_EQ(true, WIFSTOPPED(status));
2239 ASSERT_EQ(SIGCONT, WSTOPSIG(status));
2240 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2242 /* Wait for restart_syscall() to start. */
2243 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2244 ASSERT_EQ(true, WIFSTOPPED(status));
2245 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2246 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2247 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2249 ASSERT_EQ(0x200, msg);
2250 ret = get_syscall(_metadata, child_pid);
2251 #if defined(__arm__)
2254 * - native ARM registers do NOT expose true syscall.
2255 * - compat ARM registers on ARM64 DO expose true syscall.
2257 ASSERT_EQ(0, uname(&utsbuf));
2258 if (strncmp(utsbuf.machine, "arm", 3) == 0) {
2259 EXPECT_EQ(__NR_nanosleep, ret);
2263 EXPECT_EQ(__NR_restart_syscall, ret);
2266 /* Write again to end test. */
2267 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2268 ASSERT_EQ(1, write(pipefd[1], "!", 1));
2269 EXPECT_EQ(0, close(pipefd[1]));
2271 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2272 if (WIFSIGNALED(status) || WEXITSTATUS(status))
2273 _metadata->passed = 0;
2278 * - add microbenchmarks
2279 * - expand NNP testing
2280 * - better arch-specific TRACE and TRAP handlers.
2281 * - endianness checking when appropriate
2282 * - 64-bit arg prodding
2283 * - arch value testing (x86 modes especially)