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.
9 #include <asm/siginfo.h>
10 #define __have_siginfo_t 1
11 #define __have_sigval_t 1
12 #define __have_sigevent_t 1
15 #include <linux/filter.h>
16 #include <sys/prctl.h>
17 #include <sys/ptrace.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 "../kselftest_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 start_tracer(struct __test_metadata
*_metadata
, int fd
, pid_t tracee
,
1025 tracer_func_t tracer_func
, void *args
, bool ptrace_syscall
)
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_syscall
?
1046 PTRACE_O_TRACESYSGOOD
:
1047 PTRACE_O_TRACESECCOMP
);
1049 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1050 kill(tracee
, SIGKILL
);
1052 ret
= ptrace(ptrace_syscall
? PTRACE_SYSCALL
: PTRACE_CONT
,
1056 /* Unblock the tracee */
1057 ASSERT_EQ(1, write(fd
, "A", 1));
1058 ASSERT_EQ(0, close(fd
));
1060 /* Run until we're shut down. Must assert to stop execution. */
1061 while (tracer_running
) {
1064 if (wait(&status
) != tracee
)
1066 if (WIFSIGNALED(status
) || WIFEXITED(status
))
1067 /* Child is dead. Time to go. */
1070 /* Check if this is a seccomp event. */
1071 ASSERT_EQ(!ptrace_syscall
, IS_SECCOMP_EVENT(status
));
1073 tracer_func(_metadata
, tracee
, status
, args
);
1075 ret
= ptrace(ptrace_syscall
? PTRACE_SYSCALL
: PTRACE_CONT
,
1079 /* Directly report the status of our test harness results. */
1080 syscall(__NR_exit
, _metadata
->passed
? EXIT_SUCCESS
: EXIT_FAILURE
);
1083 /* Common tracer setup/teardown functions. */
1084 void cont_handler(int num
)
1086 pid_t
setup_trace_fixture(struct __test_metadata
*_metadata
,
1087 tracer_func_t func
, void *args
, bool ptrace_syscall
)
1092 pid_t tracee
= getpid();
1094 /* Setup a pipe for clean synchronization. */
1095 ASSERT_EQ(0, pipe(pipefd
));
1097 /* Fork a child which we'll promote to tracer */
1098 tracer_pid
= fork();
1099 ASSERT_LE(0, tracer_pid
);
1100 signal(SIGALRM
, cont_handler
);
1101 if (tracer_pid
== 0) {
1103 start_tracer(_metadata
, pipefd
[1], tracee
, func
, args
,
1105 syscall(__NR_exit
, 0);
1108 prctl(PR_SET_PTRACER
, tracer_pid
, 0, 0, 0);
1109 read(pipefd
[0], &sync
, 1);
1114 void teardown_trace_fixture(struct __test_metadata
*_metadata
,
1120 * Extract the exit code from the other process and
1121 * adopt it for ourselves in case its asserts failed.
1123 ASSERT_EQ(0, kill(tracer
, SIGUSR1
));
1124 ASSERT_EQ(tracer
, waitpid(tracer
, &status
, 0));
1125 if (WEXITSTATUS(status
))
1126 _metadata
->passed
= 0;
1130 /* "poke" tracer arguments and function. */
1131 struct tracer_args_poke_t
{
1132 unsigned long poke_addr
;
1135 void tracer_poke(struct __test_metadata
*_metadata
, pid_t tracee
, int status
,
1140 struct tracer_args_poke_t
*info
= (struct tracer_args_poke_t
*)args
;
1142 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1144 /* If this fails, don't try to recover. */
1145 ASSERT_EQ(0x1001, msg
) {
1146 kill(tracee
, SIGKILL
);
1149 * Poke in the message.
1150 * Registers are not touched to try to keep this relatively arch
1153 ret
= ptrace(PTRACE_POKEDATA
, tracee
, info
->poke_addr
, 0x1001);
1157 FIXTURE_DATA(TRACE_poke
) {
1158 struct sock_fprog prog
;
1161 struct tracer_args_poke_t tracer_args
;
1164 FIXTURE_SETUP(TRACE_poke
)
1166 struct sock_filter filter
[] = {
1167 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1168 offsetof(struct seccomp_data
, nr
)),
1169 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 0, 1),
1170 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1001),
1171 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1175 memset(&self
->prog
, 0, sizeof(self
->prog
));
1176 self
->prog
.filter
= malloc(sizeof(filter
));
1177 ASSERT_NE(NULL
, self
->prog
.filter
);
1178 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
1179 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
1181 /* Set up tracer args. */
1182 self
->tracer_args
.poke_addr
= (unsigned long)&self
->poked
;
1184 /* Launch tracer. */
1185 self
->tracer
= setup_trace_fixture(_metadata
, tracer_poke
,
1186 &self
->tracer_args
, false);
1189 FIXTURE_TEARDOWN(TRACE_poke
)
1191 teardown_trace_fixture(_metadata
, self
->tracer
);
1192 if (self
->prog
.filter
)
1193 free(self
->prog
.filter
);
1196 TEST_F(TRACE_poke
, read_has_side_effects
)
1200 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1203 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1206 EXPECT_EQ(0, self
->poked
);
1207 ret
= read(-1, NULL
, 0);
1209 EXPECT_EQ(0x1001, self
->poked
);
1212 TEST_F(TRACE_poke
, getpid_runs_normally
)
1216 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1219 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1222 EXPECT_EQ(0, self
->poked
);
1223 EXPECT_NE(0, syscall(__NR_getpid
));
1224 EXPECT_EQ(0, self
->poked
);
1227 #if defined(__x86_64__)
1228 # define ARCH_REGS struct user_regs_struct
1229 # define SYSCALL_NUM orig_rax
1230 # define SYSCALL_RET rax
1231 #elif defined(__i386__)
1232 # define ARCH_REGS struct user_regs_struct
1233 # define SYSCALL_NUM orig_eax
1234 # define SYSCALL_RET eax
1235 #elif defined(__arm__)
1236 # define ARCH_REGS struct pt_regs
1237 # define SYSCALL_NUM ARM_r7
1238 # define SYSCALL_RET ARM_r0
1239 #elif defined(__aarch64__)
1240 # define ARCH_REGS struct user_pt_regs
1241 # define SYSCALL_NUM regs[8]
1242 # define SYSCALL_RET regs[0]
1243 #elif defined(__hppa__)
1244 # define ARCH_REGS struct user_regs_struct
1245 # define SYSCALL_NUM gr[20]
1246 # define SYSCALL_RET gr[28]
1247 #elif defined(__powerpc__)
1248 # define ARCH_REGS struct pt_regs
1249 # define SYSCALL_NUM gpr[0]
1250 # define SYSCALL_RET gpr[3]
1251 #elif defined(__s390__)
1252 # define ARCH_REGS s390_regs
1253 # define SYSCALL_NUM gprs[2]
1254 # define SYSCALL_RET gprs[2]
1255 #elif defined(__mips__)
1256 # define ARCH_REGS struct pt_regs
1257 # define SYSCALL_NUM regs[2]
1258 # define SYSCALL_SYSCALL_NUM regs[4]
1259 # define SYSCALL_RET regs[2]
1260 # define SYSCALL_NUM_RET_SHARE_REG
1262 # error "Do not know how to find your architecture's registers and syscalls"
1265 /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
1266 * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
1268 #if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
1269 #define HAVE_GETREGS
1272 /* Architecture-specific syscall fetching routine. */
1273 int get_syscall(struct __test_metadata
*_metadata
, pid_t tracee
)
1277 EXPECT_EQ(0, ptrace(PTRACE_GETREGS
, tracee
, 0, ®s
)) {
1278 TH_LOG("PTRACE_GETREGS failed");
1284 iov
.iov_base
= ®s
;
1285 iov
.iov_len
= sizeof(regs
);
1286 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET
, tracee
, NT_PRSTATUS
, &iov
)) {
1287 TH_LOG("PTRACE_GETREGSET failed");
1292 #if defined(__mips__)
1293 if (regs
.SYSCALL_NUM
== __NR_O32_Linux
)
1294 return regs
.SYSCALL_SYSCALL_NUM
;
1296 return regs
.SYSCALL_NUM
;
1299 /* Architecture-specific syscall changing routine. */
1300 void change_syscall(struct __test_metadata
*_metadata
,
1301 pid_t tracee
, int syscall
)
1306 ret
= ptrace(PTRACE_GETREGS
, tracee
, 0, ®s
);
1309 iov
.iov_base
= ®s
;
1310 iov
.iov_len
= sizeof(regs
);
1311 ret
= ptrace(PTRACE_GETREGSET
, tracee
, NT_PRSTATUS
, &iov
);
1313 EXPECT_EQ(0, ret
) {}
1315 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1316 defined(__s390__) || defined(__hppa__)
1318 regs
.SYSCALL_NUM
= syscall
;
1320 #elif defined(__mips__)
1322 if (regs
.SYSCALL_NUM
== __NR_O32_Linux
)
1323 regs
.SYSCALL_SYSCALL_NUM
= syscall
;
1325 regs
.SYSCALL_NUM
= syscall
;
1328 #elif defined(__arm__)
1329 # ifndef PTRACE_SET_SYSCALL
1330 # define PTRACE_SET_SYSCALL 23
1333 ret
= ptrace(PTRACE_SET_SYSCALL
, tracee
, NULL
, syscall
);
1337 #elif defined(__aarch64__)
1338 # ifndef NT_ARM_SYSTEM_CALL
1339 # define NT_ARM_SYSTEM_CALL 0x404
1342 iov
.iov_base
= &syscall
;
1343 iov
.iov_len
= sizeof(syscall
);
1344 ret
= ptrace(PTRACE_SETREGSET
, tracee
, NT_ARM_SYSTEM_CALL
,
1351 TH_LOG("How is the syscall changed on this architecture?");
1355 /* If syscall is skipped, change return value. */
1357 #ifdef SYSCALL_NUM_RET_SHARE_REG
1358 TH_LOG("Can't modify syscall return on this architecture");
1360 regs
.SYSCALL_RET
= 1;
1364 ret
= ptrace(PTRACE_SETREGS
, tracee
, 0, ®s
);
1366 iov
.iov_base
= ®s
;
1367 iov
.iov_len
= sizeof(regs
);
1368 ret
= ptrace(PTRACE_SETREGSET
, tracee
, NT_PRSTATUS
, &iov
);
1373 void tracer_syscall(struct __test_metadata
*_metadata
, pid_t tracee
,
1374 int status
, void *args
)
1379 /* Make sure we got the right message. */
1380 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1383 /* Validate and take action on expected syscalls. */
1386 /* change getpid to getppid. */
1387 EXPECT_EQ(__NR_getpid
, get_syscall(_metadata
, tracee
));
1388 change_syscall(_metadata
, tracee
, __NR_getppid
);
1392 EXPECT_EQ(__NR_gettid
, get_syscall(_metadata
, tracee
));
1393 change_syscall(_metadata
, tracee
, -1);
1396 /* do nothing (allow getppid) */
1397 EXPECT_EQ(__NR_getppid
, get_syscall(_metadata
, tracee
));
1401 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg
);
1402 kill(tracee
, SIGKILL
);
1408 void tracer_ptrace(struct __test_metadata
*_metadata
, pid_t tracee
,
1409 int status
, void *args
)
1415 /* Make sure we got an empty message. */
1416 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1420 /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
1425 nr
= get_syscall(_metadata
, tracee
);
1427 if (nr
== __NR_getpid
)
1428 change_syscall(_metadata
, tracee
, __NR_getppid
);
1431 FIXTURE_DATA(TRACE_syscall
) {
1432 struct sock_fprog prog
;
1433 pid_t tracer
, mytid
, mypid
, parent
;
1436 FIXTURE_SETUP(TRACE_syscall
)
1438 struct sock_filter filter
[] = {
1439 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1440 offsetof(struct seccomp_data
, nr
)),
1441 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
1442 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1002),
1443 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_gettid
, 0, 1),
1444 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1003),
1445 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1446 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1004),
1447 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1450 memset(&self
->prog
, 0, sizeof(self
->prog
));
1451 self
->prog
.filter
= malloc(sizeof(filter
));
1452 ASSERT_NE(NULL
, self
->prog
.filter
);
1453 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
1454 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
1456 /* Prepare some testable syscall results. */
1457 self
->mytid
= syscall(__NR_gettid
);
1458 ASSERT_GT(self
->mytid
, 0);
1459 ASSERT_NE(self
->mytid
, 1) {
1460 TH_LOG("Running this test as init is not supported. :)");
1463 self
->mypid
= getpid();
1464 ASSERT_GT(self
->mypid
, 0);
1465 ASSERT_EQ(self
->mytid
, self
->mypid
);
1467 self
->parent
= getppid();
1468 ASSERT_GT(self
->parent
, 0);
1469 ASSERT_NE(self
->parent
, self
->mypid
);
1471 /* Launch tracer. */
1472 self
->tracer
= setup_trace_fixture(_metadata
, tracer_syscall
, NULL
,
1476 FIXTURE_TEARDOWN(TRACE_syscall
)
1478 teardown_trace_fixture(_metadata
, self
->tracer
);
1479 if (self
->prog
.filter
)
1480 free(self
->prog
.filter
);
1483 TEST_F(TRACE_syscall
, syscall_allowed
)
1487 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1490 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1493 /* getppid works as expected (no changes). */
1494 EXPECT_EQ(self
->parent
, syscall(__NR_getppid
));
1495 EXPECT_NE(self
->mypid
, syscall(__NR_getppid
));
1498 TEST_F(TRACE_syscall
, syscall_redirected
)
1502 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1505 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1508 /* getpid has been redirected to getppid as expected. */
1509 EXPECT_EQ(self
->parent
, syscall(__NR_getpid
));
1510 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1513 TEST_F(TRACE_syscall
, syscall_dropped
)
1517 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1520 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1523 #ifdef SYSCALL_NUM_RET_SHARE_REG
1524 /* gettid has been skipped */
1525 EXPECT_EQ(-1, syscall(__NR_gettid
));
1527 /* gettid has been skipped and an altered return value stored. */
1528 EXPECT_EQ(1, syscall(__NR_gettid
));
1530 EXPECT_NE(self
->mytid
, syscall(__NR_gettid
));
1533 TEST_F(TRACE_syscall
, skip_after_RET_TRACE
)
1535 struct sock_filter filter
[] = {
1536 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1537 offsetof(struct seccomp_data
, nr
)),
1538 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1539 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EPERM
),
1540 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1542 struct sock_fprog prog
= {
1543 .len
= (unsigned short)ARRAY_SIZE(filter
),
1548 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1551 /* Install fixture filter. */
1552 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1555 /* Install "errno on getppid" filter. */
1556 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1559 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
1560 EXPECT_EQ(-1, syscall(__NR_getpid
));
1561 EXPECT_EQ(EPERM
, errno
);
1564 TEST_F_SIGNAL(TRACE_syscall
, kill_after_RET_TRACE
, SIGSYS
)
1566 struct sock_filter filter
[] = {
1567 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1568 offsetof(struct seccomp_data
, nr
)),
1569 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1570 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1571 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1573 struct sock_fprog prog
= {
1574 .len
= (unsigned short)ARRAY_SIZE(filter
),
1579 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1582 /* Install fixture filter. */
1583 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1586 /* Install "death on getppid" filter. */
1587 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1590 /* Tracer will redirect getpid to getppid, and we should die. */
1591 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1594 TEST_F(TRACE_syscall
, skip_after_ptrace
)
1596 struct sock_filter filter
[] = {
1597 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1598 offsetof(struct seccomp_data
, nr
)),
1599 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1600 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EPERM
),
1601 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1603 struct sock_fprog prog
= {
1604 .len
= (unsigned short)ARRAY_SIZE(filter
),
1609 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1610 teardown_trace_fixture(_metadata
, self
->tracer
);
1611 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1614 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1617 /* Install "errno on getppid" filter. */
1618 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1621 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
1622 EXPECT_EQ(-1, syscall(__NR_getpid
));
1623 EXPECT_EQ(EPERM
, errno
);
1626 TEST_F_SIGNAL(TRACE_syscall
, kill_after_ptrace
, SIGSYS
)
1628 struct sock_filter filter
[] = {
1629 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1630 offsetof(struct seccomp_data
, nr
)),
1631 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1632 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1633 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1635 struct sock_fprog prog
= {
1636 .len
= (unsigned short)ARRAY_SIZE(filter
),
1641 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1642 teardown_trace_fixture(_metadata
, self
->tracer
);
1643 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1646 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1649 /* Install "death on getppid" filter. */
1650 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1653 /* Tracer will redirect getpid to getppid, and we should die. */
1654 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1657 #ifndef __NR_seccomp
1658 # if defined(__i386__)
1659 # define __NR_seccomp 354
1660 # elif defined(__x86_64__)
1661 # define __NR_seccomp 317
1662 # elif defined(__arm__)
1663 # define __NR_seccomp 383
1664 # elif defined(__aarch64__)
1665 # define __NR_seccomp 277
1666 # elif defined(__hppa__)
1667 # define __NR_seccomp 338
1668 # elif defined(__powerpc__)
1669 # define __NR_seccomp 358
1670 # elif defined(__s390__)
1671 # define __NR_seccomp 348
1673 # warning "seccomp syscall number unknown for this architecture"
1674 # define __NR_seccomp 0xffff
1678 #ifndef SECCOMP_SET_MODE_STRICT
1679 #define SECCOMP_SET_MODE_STRICT 0
1682 #ifndef SECCOMP_SET_MODE_FILTER
1683 #define SECCOMP_SET_MODE_FILTER 1
1686 #ifndef SECCOMP_FILTER_FLAG_TSYNC
1687 #define SECCOMP_FILTER_FLAG_TSYNC 1
1691 int seccomp(unsigned int op
, unsigned int flags
, void *args
)
1694 return syscall(__NR_seccomp
, op
, flags
, args
);
1698 TEST(seccomp_syscall
)
1700 struct sock_filter filter
[] = {
1701 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1703 struct sock_fprog prog
= {
1704 .len
= (unsigned short)ARRAY_SIZE(filter
),
1709 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1711 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1714 /* Reject insane operation. */
1715 ret
= seccomp(-1, 0, &prog
);
1716 ASSERT_NE(ENOSYS
, errno
) {
1717 TH_LOG("Kernel does not support seccomp syscall!");
1719 EXPECT_EQ(EINVAL
, errno
) {
1720 TH_LOG("Did not reject crazy op value!");
1723 /* Reject strict with flags or pointer. */
1724 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, -1, NULL
);
1725 EXPECT_EQ(EINVAL
, errno
) {
1726 TH_LOG("Did not reject mode strict with flags!");
1728 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, 0, &prog
);
1729 EXPECT_EQ(EINVAL
, errno
) {
1730 TH_LOG("Did not reject mode strict with uargs!");
1733 /* Reject insane args for filter. */
1734 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, -1, &prog
);
1735 EXPECT_EQ(EINVAL
, errno
) {
1736 TH_LOG("Did not reject crazy filter flags!");
1738 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, NULL
);
1739 EXPECT_EQ(EFAULT
, errno
) {
1740 TH_LOG("Did not reject NULL filter!");
1743 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
1744 EXPECT_EQ(0, errno
) {
1745 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
1750 TEST(seccomp_syscall_mode_lock
)
1752 struct sock_filter filter
[] = {
1753 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1755 struct sock_fprog prog
= {
1756 .len
= (unsigned short)ARRAY_SIZE(filter
),
1761 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
1763 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1766 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
1767 ASSERT_NE(ENOSYS
, errno
) {
1768 TH_LOG("Kernel does not support seccomp syscall!");
1771 TH_LOG("Could not install filter!");
1774 /* Make sure neither entry point will switch to strict. */
1775 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, 0, 0, 0);
1776 EXPECT_EQ(EINVAL
, errno
) {
1777 TH_LOG("Switched to mode strict!");
1780 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, 0, NULL
);
1781 EXPECT_EQ(EINVAL
, errno
) {
1782 TH_LOG("Switched to mode strict!");
1788 struct sock_filter filter
[] = {
1789 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1791 struct sock_fprog prog
= {
1792 .len
= (unsigned short)ARRAY_SIZE(filter
),
1797 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
1799 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1802 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
1804 ASSERT_NE(ENOSYS
, errno
) {
1805 TH_LOG("Kernel does not support seccomp syscall!");
1808 TH_LOG("Could not install initial filter with TSYNC!");
1812 #define TSYNC_SIBLINGS 2
1813 struct tsync_sibling
{
1817 pthread_cond_t
*cond
;
1818 pthread_mutex_t
*mutex
;
1821 struct sock_fprog
*prog
;
1822 struct __test_metadata
*metadata
;
1826 * To avoid joining joined threads (which is not allowed by Bionic),
1827 * make sure we both successfully join and clear the tid to skip a
1828 * later join attempt during fixture teardown. Any remaining threads
1829 * will be directly killed during teardown.
1831 #define PTHREAD_JOIN(tid, status) \
1833 int _rc = pthread_join(tid, status); \
1835 TH_LOG("pthread_join of tid %u failed: %d\n", \
1836 (unsigned int)tid, _rc); \
1842 FIXTURE_DATA(TSYNC
) {
1843 struct sock_fprog root_prog
, apply_prog
;
1844 struct tsync_sibling sibling
[TSYNC_SIBLINGS
];
1846 pthread_cond_t cond
;
1847 pthread_mutex_t mutex
;
1851 FIXTURE_SETUP(TSYNC
)
1853 struct sock_filter root_filter
[] = {
1854 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1856 struct sock_filter apply_filter
[] = {
1857 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1858 offsetof(struct seccomp_data
, nr
)),
1859 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 0, 1),
1860 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1861 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1864 memset(&self
->root_prog
, 0, sizeof(self
->root_prog
));
1865 memset(&self
->apply_prog
, 0, sizeof(self
->apply_prog
));
1866 memset(&self
->sibling
, 0, sizeof(self
->sibling
));
1867 self
->root_prog
.filter
= malloc(sizeof(root_filter
));
1868 ASSERT_NE(NULL
, self
->root_prog
.filter
);
1869 memcpy(self
->root_prog
.filter
, &root_filter
, sizeof(root_filter
));
1870 self
->root_prog
.len
= (unsigned short)ARRAY_SIZE(root_filter
);
1872 self
->apply_prog
.filter
= malloc(sizeof(apply_filter
));
1873 ASSERT_NE(NULL
, self
->apply_prog
.filter
);
1874 memcpy(self
->apply_prog
.filter
, &apply_filter
, sizeof(apply_filter
));
1875 self
->apply_prog
.len
= (unsigned short)ARRAY_SIZE(apply_filter
);
1877 self
->sibling_count
= 0;
1878 pthread_mutex_init(&self
->mutex
, NULL
);
1879 pthread_cond_init(&self
->cond
, NULL
);
1880 sem_init(&self
->started
, 0, 0);
1881 self
->sibling
[0].tid
= 0;
1882 self
->sibling
[0].cond
= &self
->cond
;
1883 self
->sibling
[0].started
= &self
->started
;
1884 self
->sibling
[0].mutex
= &self
->mutex
;
1885 self
->sibling
[0].diverge
= 0;
1886 self
->sibling
[0].num_waits
= 1;
1887 self
->sibling
[0].prog
= &self
->root_prog
;
1888 self
->sibling
[0].metadata
= _metadata
;
1889 self
->sibling
[1].tid
= 0;
1890 self
->sibling
[1].cond
= &self
->cond
;
1891 self
->sibling
[1].started
= &self
->started
;
1892 self
->sibling
[1].mutex
= &self
->mutex
;
1893 self
->sibling
[1].diverge
= 0;
1894 self
->sibling
[1].prog
= &self
->root_prog
;
1895 self
->sibling
[1].num_waits
= 1;
1896 self
->sibling
[1].metadata
= _metadata
;
1899 FIXTURE_TEARDOWN(TSYNC
)
1903 if (self
->root_prog
.filter
)
1904 free(self
->root_prog
.filter
);
1905 if (self
->apply_prog
.filter
)
1906 free(self
->apply_prog
.filter
);
1908 for ( ; sib
< self
->sibling_count
; ++sib
) {
1909 struct tsync_sibling
*s
= &self
->sibling
[sib
];
1914 * If a thread is still running, it may be stuck, so hit
1915 * it over the head really hard.
1917 pthread_kill(s
->tid
, 9);
1919 pthread_mutex_destroy(&self
->mutex
);
1920 pthread_cond_destroy(&self
->cond
);
1921 sem_destroy(&self
->started
);
1924 void *tsync_sibling(void *data
)
1927 struct tsync_sibling
*me
= data
;
1929 me
->system_tid
= syscall(__NR_gettid
);
1931 pthread_mutex_lock(me
->mutex
);
1933 /* Just re-apply the root prog to fork the tree */
1934 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
,
1937 sem_post(me
->started
);
1938 /* Return outside of started so parent notices failures. */
1940 pthread_mutex_unlock(me
->mutex
);
1941 return (void *)SIBLING_EXIT_FAILURE
;
1944 pthread_cond_wait(me
->cond
, me
->mutex
);
1945 me
->num_waits
= me
->num_waits
- 1;
1946 } while (me
->num_waits
);
1947 pthread_mutex_unlock(me
->mutex
);
1949 ret
= prctl(PR_GET_NO_NEW_PRIVS
, 0, 0, 0, 0);
1951 return (void *)SIBLING_EXIT_NEWPRIVS
;
1953 return (void *)SIBLING_EXIT_UNKILLED
;
1956 void tsync_start_sibling(struct tsync_sibling
*sibling
)
1958 pthread_create(&sibling
->tid
, NULL
, tsync_sibling
, (void *)sibling
);
1961 TEST_F(TSYNC
, siblings_fail_prctl
)
1965 struct sock_filter filter
[] = {
1966 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1967 offsetof(struct seccomp_data
, nr
)),
1968 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
1969 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EINVAL
),
1970 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1972 struct sock_fprog prog
= {
1973 .len
= (unsigned short)ARRAY_SIZE(filter
),
1977 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
1978 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1981 /* Check prctl failure detection by requesting sib 0 diverge. */
1982 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
1983 ASSERT_NE(ENOSYS
, errno
) {
1984 TH_LOG("Kernel does not support seccomp syscall!");
1987 TH_LOG("setting filter failed");
1990 self
->sibling
[0].diverge
= 1;
1991 tsync_start_sibling(&self
->sibling
[0]);
1992 tsync_start_sibling(&self
->sibling
[1]);
1994 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
1995 sem_wait(&self
->started
);
1996 self
->sibling_count
++;
1999 /* Signal the threads to clean up*/
2000 pthread_mutex_lock(&self
->mutex
);
2001 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2002 TH_LOG("cond broadcast non-zero");
2004 pthread_mutex_unlock(&self
->mutex
);
2006 /* Ensure diverging sibling failed to call prctl. */
2007 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2008 EXPECT_EQ(SIBLING_EXIT_FAILURE
, (long)status
);
2009 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2010 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2013 TEST_F(TSYNC
, two_siblings_with_ancestor
)
2018 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2019 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2022 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2023 ASSERT_NE(ENOSYS
, errno
) {
2024 TH_LOG("Kernel does not support seccomp syscall!");
2027 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2029 tsync_start_sibling(&self
->sibling
[0]);
2030 tsync_start_sibling(&self
->sibling
[1]);
2032 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2033 sem_wait(&self
->started
);
2034 self
->sibling_count
++;
2037 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2040 TH_LOG("Could install filter on all threads!");
2042 /* Tell the siblings to test the policy */
2043 pthread_mutex_lock(&self
->mutex
);
2044 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2045 TH_LOG("cond broadcast non-zero");
2047 pthread_mutex_unlock(&self
->mutex
);
2048 /* Ensure they are both killed and don't exit cleanly. */
2049 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2050 EXPECT_EQ(0x0, (long)status
);
2051 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2052 EXPECT_EQ(0x0, (long)status
);
2055 TEST_F(TSYNC
, two_sibling_want_nnp
)
2059 /* start siblings before any prctl() operations */
2060 tsync_start_sibling(&self
->sibling
[0]);
2061 tsync_start_sibling(&self
->sibling
[1]);
2062 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2063 sem_wait(&self
->started
);
2064 self
->sibling_count
++;
2067 /* Tell the siblings to test no policy */
2068 pthread_mutex_lock(&self
->mutex
);
2069 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2070 TH_LOG("cond broadcast non-zero");
2072 pthread_mutex_unlock(&self
->mutex
);
2074 /* Ensure they are both upset about lacking nnp. */
2075 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2076 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS
, (long)status
);
2077 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2078 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS
, (long)status
);
2081 TEST_F(TSYNC
, two_siblings_with_no_filter
)
2086 /* start siblings before any prctl() operations */
2087 tsync_start_sibling(&self
->sibling
[0]);
2088 tsync_start_sibling(&self
->sibling
[1]);
2089 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2090 sem_wait(&self
->started
);
2091 self
->sibling_count
++;
2094 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2095 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2098 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2100 ASSERT_NE(ENOSYS
, errno
) {
2101 TH_LOG("Kernel does not support seccomp syscall!");
2104 TH_LOG("Could install filter on all threads!");
2107 /* Tell the siblings to test the policy */
2108 pthread_mutex_lock(&self
->mutex
);
2109 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2110 TH_LOG("cond broadcast non-zero");
2112 pthread_mutex_unlock(&self
->mutex
);
2114 /* Ensure they are both killed and don't exit cleanly. */
2115 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2116 EXPECT_EQ(0x0, (long)status
);
2117 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2118 EXPECT_EQ(0x0, (long)status
);
2121 TEST_F(TSYNC
, two_siblings_with_one_divergence
)
2126 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2127 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2130 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2131 ASSERT_NE(ENOSYS
, errno
) {
2132 TH_LOG("Kernel does not support seccomp syscall!");
2135 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2137 self
->sibling
[0].diverge
= 1;
2138 tsync_start_sibling(&self
->sibling
[0]);
2139 tsync_start_sibling(&self
->sibling
[1]);
2141 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2142 sem_wait(&self
->started
);
2143 self
->sibling_count
++;
2146 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2148 ASSERT_EQ(self
->sibling
[0].system_tid
, ret
) {
2149 TH_LOG("Did not fail on diverged sibling.");
2152 /* Wake the threads */
2153 pthread_mutex_lock(&self
->mutex
);
2154 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2155 TH_LOG("cond broadcast non-zero");
2157 pthread_mutex_unlock(&self
->mutex
);
2159 /* Ensure they are both unkilled. */
2160 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2161 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2162 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2163 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2166 TEST_F(TSYNC
, two_siblings_not_under_filter
)
2171 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2172 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2176 * Sibling 0 will have its own seccomp policy
2177 * and Sibling 1 will not be under seccomp at
2178 * all. Sibling 1 will enter seccomp and 0
2179 * will cause failure.
2181 self
->sibling
[0].diverge
= 1;
2182 tsync_start_sibling(&self
->sibling
[0]);
2183 tsync_start_sibling(&self
->sibling
[1]);
2185 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2186 sem_wait(&self
->started
);
2187 self
->sibling_count
++;
2190 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2191 ASSERT_NE(ENOSYS
, errno
) {
2192 TH_LOG("Kernel does not support seccomp syscall!");
2195 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2198 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2200 ASSERT_EQ(ret
, self
->sibling
[0].system_tid
) {
2201 TH_LOG("Did not fail on diverged sibling.");
2204 if (ret
== self
->sibling
[0].system_tid
)
2207 pthread_mutex_lock(&self
->mutex
);
2209 /* Increment the other siblings num_waits so we can clean up
2210 * the one we just saw.
2212 self
->sibling
[!sib
].num_waits
+= 1;
2214 /* Signal the thread to clean up*/
2215 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2216 TH_LOG("cond broadcast non-zero");
2218 pthread_mutex_unlock(&self
->mutex
);
2219 PTHREAD_JOIN(self
->sibling
[sib
].tid
, &status
);
2220 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2221 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2222 while (!kill(self
->sibling
[sib
].system_tid
, 0))
2224 /* Switch to the remaining sibling */
2227 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2230 TH_LOG("Expected the remaining sibling to sync");
2233 pthread_mutex_lock(&self
->mutex
);
2235 /* If remaining sibling didn't have a chance to wake up during
2236 * the first broadcast, manually reduce the num_waits now.
2238 if (self
->sibling
[sib
].num_waits
> 1)
2239 self
->sibling
[sib
].num_waits
= 1;
2240 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2241 TH_LOG("cond broadcast non-zero");
2243 pthread_mutex_unlock(&self
->mutex
);
2244 PTHREAD_JOIN(self
->sibling
[sib
].tid
, &status
);
2245 EXPECT_EQ(0, (long)status
);
2246 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2247 while (!kill(self
->sibling
[sib
].system_tid
, 0))
2250 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2252 ASSERT_EQ(0, ret
); /* just us chickens */
2255 /* Make sure restarted syscalls are seen directly as "restart_syscall". */
2256 TEST(syscall_restart
)
2263 siginfo_t info
= { };
2264 struct sock_filter filter
[] = {
2265 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2266 offsetof(struct seccomp_data
, nr
)),
2268 #ifdef __NR_sigreturn
2269 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_sigreturn
, 6, 0),
2271 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 5, 0),
2272 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_exit
, 4, 0),
2273 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_rt_sigreturn
, 3, 0),
2274 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_nanosleep
, 4, 0),
2275 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_restart_syscall
, 4, 0),
2277 /* Allow __NR_write for easy logging. */
2278 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_write
, 0, 1),
2279 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2280 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2281 /* The nanosleep jump target. */
2282 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
|0x100),
2283 /* The restart_syscall jump target. */
2284 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
|0x200),
2286 struct sock_fprog prog
= {
2287 .len
= (unsigned short)ARRAY_SIZE(filter
),
2290 #if defined(__arm__)
2291 struct utsname utsbuf
;
2294 ASSERT_EQ(0, pipe(pipefd
));
2297 ASSERT_LE(0, child_pid
);
2298 if (child_pid
== 0) {
2299 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2301 struct timespec timeout
= { };
2303 /* Attach parent as tracer and stop. */
2304 EXPECT_EQ(0, ptrace(PTRACE_TRACEME
));
2305 EXPECT_EQ(0, raise(SIGSTOP
));
2307 EXPECT_EQ(0, close(pipefd
[1]));
2309 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2310 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2313 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
2315 TH_LOG("Failed to install filter!");
2318 EXPECT_EQ(1, read(pipefd
[0], &buf
, 1)) {
2319 TH_LOG("Failed to read() sync from parent");
2321 EXPECT_EQ('.', buf
) {
2322 TH_LOG("Failed to get sync data from read()");
2325 /* Start nanosleep to be interrupted. */
2328 EXPECT_EQ(0, nanosleep(&timeout
, NULL
)) {
2329 TH_LOG("Call to nanosleep() failed (errno %d)", errno
);
2332 /* Read final sync from parent. */
2333 EXPECT_EQ(1, read(pipefd
[0], &buf
, 1)) {
2334 TH_LOG("Failed final read() from parent");
2336 EXPECT_EQ('!', buf
) {
2337 TH_LOG("Failed to get final data from read()");
2340 /* Directly report the status of our test harness results. */
2341 syscall(__NR_exit
, _metadata
->passed
? EXIT_SUCCESS
2344 EXPECT_EQ(0, close(pipefd
[0]));
2346 /* Attach to child, setup options, and release. */
2347 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2348 ASSERT_EQ(true, WIFSTOPPED(status
));
2349 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS
, child_pid
, NULL
,
2350 PTRACE_O_TRACESECCOMP
));
2351 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2352 ASSERT_EQ(1, write(pipefd
[1], ".", 1));
2354 /* Wait for nanosleep() to start. */
2355 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2356 ASSERT_EQ(true, WIFSTOPPED(status
));
2357 ASSERT_EQ(SIGTRAP
, WSTOPSIG(status
));
2358 ASSERT_EQ(PTRACE_EVENT_SECCOMP
, (status
>> 16));
2359 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG
, child_pid
, NULL
, &msg
));
2360 ASSERT_EQ(0x100, msg
);
2361 EXPECT_EQ(__NR_nanosleep
, get_syscall(_metadata
, child_pid
));
2363 /* Might as well check siginfo for sanity while we're here. */
2364 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO
, child_pid
, NULL
, &info
));
2365 ASSERT_EQ(SIGTRAP
, info
.si_signo
);
2366 ASSERT_EQ(SIGTRAP
| (PTRACE_EVENT_SECCOMP
<< 8), info
.si_code
);
2367 EXPECT_EQ(0, info
.si_errno
);
2368 EXPECT_EQ(getuid(), info
.si_uid
);
2369 /* Verify signal delivery came from child (seccomp-triggered). */
2370 EXPECT_EQ(child_pid
, info
.si_pid
);
2372 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
2373 ASSERT_EQ(0, kill(child_pid
, SIGSTOP
));
2374 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2375 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2376 ASSERT_EQ(true, WIFSTOPPED(status
));
2377 ASSERT_EQ(SIGSTOP
, WSTOPSIG(status
));
2378 /* Verify signal delivery came from parent now. */
2379 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO
, child_pid
, NULL
, &info
));
2380 EXPECT_EQ(getpid(), info
.si_pid
);
2382 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
2383 ASSERT_EQ(0, kill(child_pid
, SIGCONT
));
2384 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2385 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2386 ASSERT_EQ(true, WIFSTOPPED(status
));
2387 ASSERT_EQ(SIGCONT
, WSTOPSIG(status
));
2388 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2390 /* Wait for restart_syscall() to start. */
2391 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2392 ASSERT_EQ(true, WIFSTOPPED(status
));
2393 ASSERT_EQ(SIGTRAP
, WSTOPSIG(status
));
2394 ASSERT_EQ(PTRACE_EVENT_SECCOMP
, (status
>> 16));
2395 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG
, child_pid
, NULL
, &msg
));
2397 ASSERT_EQ(0x200, msg
);
2398 ret
= get_syscall(_metadata
, child_pid
);
2399 #if defined(__arm__)
2402 * - native ARM registers do NOT expose true syscall.
2403 * - compat ARM registers on ARM64 DO expose true syscall.
2405 ASSERT_EQ(0, uname(&utsbuf
));
2406 if (strncmp(utsbuf
.machine
, "arm", 3) == 0) {
2407 EXPECT_EQ(__NR_nanosleep
, ret
);
2411 EXPECT_EQ(__NR_restart_syscall
, ret
);
2414 /* Write again to end test. */
2415 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2416 ASSERT_EQ(1, write(pipefd
[1], "!", 1));
2417 EXPECT_EQ(0, close(pipefd
[1]));
2419 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2420 if (WIFSIGNALED(status
) || WEXITSTATUS(status
))
2421 _metadata
->passed
= 0;
2426 * - add microbenchmarks
2427 * - expand NNP testing
2428 * - better arch-specific TRACE and TRAP handlers.
2429 * - endianness checking when appropriate
2430 * - 64-bit arg prodding
2431 * - arch value testing (x86 modes especially)