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_ALLOW
75 __u64 instruction_pointer
;
80 #ifndef SECCOMP_RET_KILL_PROCESS
81 #define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */
82 #define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */
84 #ifndef SECCOMP_RET_KILL
85 #define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
86 #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
87 #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
88 #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
89 #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
91 #ifndef SECCOMP_RET_LOG
92 #define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */
96 # if defined(__i386__)
97 # define __NR_seccomp 354
98 # elif defined(__x86_64__)
99 # define __NR_seccomp 317
100 # elif defined(__arm__)
101 # define __NR_seccomp 383
102 # elif defined(__aarch64__)
103 # define __NR_seccomp 277
104 # elif defined(__hppa__)
105 # define __NR_seccomp 338
106 # elif defined(__powerpc__)
107 # define __NR_seccomp 358
108 # elif defined(__s390__)
109 # define __NR_seccomp 348
111 # warning "seccomp syscall number unknown for this architecture"
112 # define __NR_seccomp 0xffff
116 #ifndef SECCOMP_SET_MODE_STRICT
117 #define SECCOMP_SET_MODE_STRICT 0
120 #ifndef SECCOMP_SET_MODE_FILTER
121 #define SECCOMP_SET_MODE_FILTER 1
124 #ifndef SECCOMP_GET_ACTION_AVAIL
125 #define SECCOMP_GET_ACTION_AVAIL 2
128 #ifndef SECCOMP_FILTER_FLAG_TSYNC
129 #define SECCOMP_FILTER_FLAG_TSYNC 1
132 #ifndef SECCOMP_FILTER_FLAG_LOG
133 #define SECCOMP_FILTER_FLAG_LOG 2
137 int seccomp(unsigned int op
, unsigned int flags
, void *args
)
140 return syscall(__NR_seccomp
, op
, flags
, args
);
144 #if __BYTE_ORDER == __LITTLE_ENDIAN
145 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
146 #elif __BYTE_ORDER == __BIG_ENDIAN
147 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
149 #error "wut? Unknown __BYTE_ORDER?!"
152 #define SIBLING_EXIT_UNKILLED 0xbadbeef
153 #define SIBLING_EXIT_FAILURE 0xbadface
154 #define SIBLING_EXIT_NEWPRIVS 0xbadfeed
156 TEST(mode_strict_support
)
160 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, NULL
, NULL
, NULL
);
162 TH_LOG("Kernel does not support CONFIG_SECCOMP");
164 syscall(__NR_exit
, 0);
167 TEST_SIGNAL(mode_strict_cannot_call_prctl
, SIGKILL
)
171 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, NULL
, NULL
, NULL
);
173 TH_LOG("Kernel does not support CONFIG_SECCOMP");
175 syscall(__NR_prctl
, PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
,
178 TH_LOG("Unreachable!");
182 /* Note! This doesn't test no new privs behavior */
183 TEST(no_new_privs_support
)
187 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
189 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
193 /* Tests kernel support by checking for a copy_from_user() fault on NULL. */
194 TEST(mode_filter_support
)
198 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
200 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
202 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, NULL
, NULL
, NULL
);
204 EXPECT_EQ(EFAULT
, errno
) {
205 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
209 TEST(mode_filter_without_nnp
)
211 struct sock_filter filter
[] = {
212 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
214 struct sock_fprog prog
= {
215 .len
= (unsigned short)ARRAY_SIZE(filter
),
220 ret
= prctl(PR_GET_NO_NEW_PRIVS
, 0, NULL
, 0, 0);
222 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
225 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
226 /* Succeeds with CAP_SYS_ADMIN, fails without */
227 /* TODO(wad) check caps not euid */
230 EXPECT_EQ(EACCES
, errno
);
236 #define MAX_INSNS_PER_PATH 32768
238 TEST(filter_size_limits
)
241 int count
= BPF_MAXINSNS
+ 1;
242 struct sock_filter allow
[] = {
243 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
245 struct sock_filter
*filter
;
246 struct sock_fprog prog
= { };
249 filter
= calloc(count
, sizeof(*filter
));
250 ASSERT_NE(NULL
, filter
);
252 for (i
= 0; i
< count
; i
++)
253 filter
[i
] = allow
[0];
255 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
258 prog
.filter
= filter
;
261 /* Too many filter instructions in a single filter. */
262 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
264 TH_LOG("Installing %d insn filter was allowed", prog
.len
);
267 /* One less is okay, though. */
269 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
271 TH_LOG("Installing %d insn filter wasn't allowed", prog
.len
);
275 TEST(filter_chain_limits
)
278 int count
= BPF_MAXINSNS
;
279 struct sock_filter allow
[] = {
280 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
282 struct sock_filter
*filter
;
283 struct sock_fprog prog
= { };
286 filter
= calloc(count
, sizeof(*filter
));
287 ASSERT_NE(NULL
, filter
);
289 for (i
= 0; i
< count
; i
++)
290 filter
[i
] = allow
[0];
292 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
295 prog
.filter
= filter
;
298 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
303 /* Too many total filter instructions. */
304 for (i
= 0; i
< MAX_INSNS_PER_PATH
; i
++) {
305 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
310 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
311 i
, count
, i
* (count
+ 4));
315 TEST(mode_filter_cannot_move_to_strict
)
317 struct sock_filter filter
[] = {
318 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
320 struct sock_fprog prog
= {
321 .len
= (unsigned short)ARRAY_SIZE(filter
),
326 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
329 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
332 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, NULL
, 0, 0);
334 EXPECT_EQ(EINVAL
, errno
);
338 TEST(mode_filter_get_seccomp
)
340 struct sock_filter filter
[] = {
341 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
343 struct sock_fprog prog
= {
344 .len
= (unsigned short)ARRAY_SIZE(filter
),
349 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
352 ret
= prctl(PR_GET_SECCOMP
, 0, 0, 0, 0);
355 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
358 ret
= prctl(PR_GET_SECCOMP
, 0, 0, 0, 0);
365 struct sock_filter filter
[] = {
366 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
368 struct sock_fprog prog
= {
369 .len
= (unsigned short)ARRAY_SIZE(filter
),
374 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
377 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
383 struct sock_filter filter
[] = {
385 struct sock_fprog prog
= {
386 .len
= (unsigned short)ARRAY_SIZE(filter
),
391 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
394 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
396 EXPECT_EQ(EINVAL
, errno
);
401 struct sock_filter filter
[] = {
402 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_LOG
),
404 struct sock_fprog prog
= {
405 .len
= (unsigned short)ARRAY_SIZE(filter
),
409 pid_t parent
= getppid();
411 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
414 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
417 /* getppid() should succeed and be logged (no check for logging) */
418 EXPECT_EQ(parent
, syscall(__NR_getppid
));
421 TEST_SIGNAL(unknown_ret_is_kill_inside
, SIGSYS
)
423 struct sock_filter filter
[] = {
424 BPF_STMT(BPF_RET
|BPF_K
, 0x10000000U
),
426 struct sock_fprog prog
= {
427 .len
= (unsigned short)ARRAY_SIZE(filter
),
432 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
435 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
437 EXPECT_EQ(0, syscall(__NR_getpid
)) {
438 TH_LOG("getpid() shouldn't ever return");
442 /* return code >= 0x80000000 is unused. */
443 TEST_SIGNAL(unknown_ret_is_kill_above_allow
, SIGSYS
)
445 struct sock_filter filter
[] = {
446 BPF_STMT(BPF_RET
|BPF_K
, 0x90000000U
),
448 struct sock_fprog prog
= {
449 .len
= (unsigned short)ARRAY_SIZE(filter
),
454 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
457 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
459 EXPECT_EQ(0, syscall(__NR_getpid
)) {
460 TH_LOG("getpid() shouldn't ever return");
464 TEST_SIGNAL(KILL_all
, SIGSYS
)
466 struct sock_filter filter
[] = {
467 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
469 struct sock_fprog prog
= {
470 .len
= (unsigned short)ARRAY_SIZE(filter
),
475 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
478 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
482 TEST_SIGNAL(KILL_one
, SIGSYS
)
484 struct sock_filter filter
[] = {
485 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
486 offsetof(struct seccomp_data
, nr
)),
487 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
488 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
489 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
491 struct sock_fprog prog
= {
492 .len
= (unsigned short)ARRAY_SIZE(filter
),
496 pid_t parent
= getppid();
498 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
501 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
504 EXPECT_EQ(parent
, syscall(__NR_getppid
));
505 /* getpid() should never return. */
506 EXPECT_EQ(0, syscall(__NR_getpid
));
509 TEST_SIGNAL(KILL_one_arg_one
, SIGSYS
)
512 struct sock_filter filter
[] = {
513 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
514 offsetof(struct seccomp_data
, nr
)),
515 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_times
, 1, 0),
516 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
517 /* Only both with lower 32-bit for now. */
518 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
, syscall_arg(0)),
519 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
,
520 (unsigned long)&fatal_address
, 0, 1),
521 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
522 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
524 struct sock_fprog prog
= {
525 .len
= (unsigned short)ARRAY_SIZE(filter
),
529 pid_t parent
= getppid();
531 clock_t clock
= times(&timebuf
);
533 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
536 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
539 EXPECT_EQ(parent
, syscall(__NR_getppid
));
540 EXPECT_LE(clock
, syscall(__NR_times
, &timebuf
));
541 /* times() should never return. */
542 EXPECT_EQ(0, syscall(__NR_times
, &fatal_address
));
545 TEST_SIGNAL(KILL_one_arg_six
, SIGSYS
)
548 int sysno
= __NR_mmap
;
550 int sysno
= __NR_mmap2
;
552 struct sock_filter filter
[] = {
553 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
554 offsetof(struct seccomp_data
, nr
)),
555 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, sysno
, 1, 0),
556 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
557 /* Only both with lower 32-bit for now. */
558 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
, syscall_arg(5)),
559 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, 0x0C0FFEE, 0, 1),
560 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
561 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
563 struct sock_fprog prog
= {
564 .len
= (unsigned short)ARRAY_SIZE(filter
),
568 pid_t parent
= getppid();
571 int page_size
= sysconf(_SC_PAGESIZE
);
573 ASSERT_LT(0, page_size
);
575 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
578 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
581 fd
= open("/dev/zero", O_RDONLY
);
584 EXPECT_EQ(parent
, syscall(__NR_getppid
));
585 map1
= (void *)syscall(sysno
,
586 NULL
, page_size
, PROT_READ
, MAP_PRIVATE
, fd
, page_size
);
587 EXPECT_NE(MAP_FAILED
, map1
);
588 /* mmap2() should never return. */
589 map2
= (void *)syscall(sysno
,
590 NULL
, page_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0x0C0FFEE);
591 EXPECT_EQ(MAP_FAILED
, map2
);
593 /* The test failed, so clean up the resources. */
594 munmap(map1
, page_size
);
595 munmap(map2
, page_size
);
599 /* This is a thread task to die via seccomp filter violation. */
600 void *kill_thread(void *data
)
602 bool die
= (bool)data
;
605 prctl(PR_GET_SECCOMP
, 0, 0, 0, 0);
606 return (void *)SIBLING_EXIT_FAILURE
;
609 return (void *)SIBLING_EXIT_UNKILLED
;
612 /* Prepare a thread that will kill itself or both of us. */
613 void kill_thread_or_group(struct __test_metadata
*_metadata
, bool kill_process
)
617 /* Kill only when calling __NR_prctl. */
618 struct sock_filter filter_thread
[] = {
619 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
620 offsetof(struct seccomp_data
, nr
)),
621 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
622 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL_THREAD
),
623 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
625 struct sock_fprog prog_thread
= {
626 .len
= (unsigned short)ARRAY_SIZE(filter_thread
),
627 .filter
= filter_thread
,
629 struct sock_filter filter_process
[] = {
630 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
631 offsetof(struct seccomp_data
, nr
)),
632 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
633 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL_PROCESS
),
634 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
636 struct sock_fprog prog_process
= {
637 .len
= (unsigned short)ARRAY_SIZE(filter_process
),
638 .filter
= filter_process
,
641 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
642 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
645 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER
, 0,
646 kill_process
? &prog_process
: &prog_thread
));
649 * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS
650 * flag cannot be downgraded by a new filter.
652 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog_thread
));
654 /* Start a thread that will exit immediately. */
655 ASSERT_EQ(0, pthread_create(&thread
, NULL
, kill_thread
, (void *)false));
656 ASSERT_EQ(0, pthread_join(thread
, &status
));
657 ASSERT_EQ(SIBLING_EXIT_UNKILLED
, (unsigned long)status
);
659 /* Start a thread that will die immediately. */
660 ASSERT_EQ(0, pthread_create(&thread
, NULL
, kill_thread
, (void *)true));
661 ASSERT_EQ(0, pthread_join(thread
, &status
));
662 ASSERT_NE(SIBLING_EXIT_FAILURE
, (unsigned long)status
);
665 * If we get here, only the spawned thread died. Let the parent know
666 * the whole process didn't die (i.e. this thread, the spawner,
678 ASSERT_LE(0, child_pid
);
679 if (child_pid
== 0) {
680 kill_thread_or_group(_metadata
, false);
684 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
686 /* If only the thread was killed, we'll see exit 42. */
687 ASSERT_TRUE(WIFEXITED(status
));
688 ASSERT_EQ(42, WEXITSTATUS(status
));
697 ASSERT_LE(0, child_pid
);
698 if (child_pid
== 0) {
699 kill_thread_or_group(_metadata
, true);
703 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
705 /* If the entire process was killed, we'll see SIGSYS. */
706 ASSERT_TRUE(WIFSIGNALED(status
));
707 ASSERT_EQ(SIGSYS
, WTERMSIG(status
));
710 /* TODO(wad) add 64-bit versus 32-bit arg tests. */
711 TEST(arg_out_of_range
)
713 struct sock_filter filter
[] = {
714 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
, syscall_arg(6)),
715 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
717 struct sock_fprog prog
= {
718 .len
= (unsigned short)ARRAY_SIZE(filter
),
723 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
726 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
728 EXPECT_EQ(EINVAL
, errno
);
731 #define ERRNO_FILTER(name, errno) \
732 struct sock_filter _read_filter_##name[] = { \
733 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
734 offsetof(struct seccomp_data, nr)), \
735 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
736 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
737 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
739 struct sock_fprog prog_##name = { \
740 .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
741 .filter = _read_filter_##name, \
744 /* Make sure basic errno values are correctly passed through a filter. */
747 ERRNO_FILTER(valid
, E2BIG
);
749 pid_t parent
= getppid();
751 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
754 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_valid
);
757 EXPECT_EQ(parent
, syscall(__NR_getppid
));
758 EXPECT_EQ(-1, read(0, NULL
, 0));
759 EXPECT_EQ(E2BIG
, errno
);
762 /* Make sure an errno of zero is correctly handled by the arch code. */
765 ERRNO_FILTER(zero
, 0);
767 pid_t parent
= getppid();
769 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
772 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_zero
);
775 EXPECT_EQ(parent
, syscall(__NR_getppid
));
776 /* "errno" of 0 is ok. */
777 EXPECT_EQ(0, read(0, NULL
, 0));
781 * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller.
782 * This tests that the errno value gets capped correctly, fixed by
783 * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO").
787 ERRNO_FILTER(capped
, 4096);
789 pid_t parent
= getppid();
791 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
794 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_capped
);
797 EXPECT_EQ(parent
, syscall(__NR_getppid
));
798 EXPECT_EQ(-1, read(0, NULL
, 0));
799 EXPECT_EQ(4095, errno
);
803 * Filters are processed in reverse order: last applied is executed first.
804 * Since only the SECCOMP_RET_ACTION mask is tested for return values, the
805 * SECCOMP_RET_DATA mask results will follow the most recently applied
806 * matching filter return (and not the lowest or highest value).
810 ERRNO_FILTER(first
, 11);
811 ERRNO_FILTER(second
, 13);
812 ERRNO_FILTER(third
, 12);
814 pid_t parent
= getppid();
816 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
819 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_first
);
822 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_second
);
825 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_third
);
828 EXPECT_EQ(parent
, syscall(__NR_getppid
));
829 EXPECT_EQ(-1, read(0, NULL
, 0));
830 EXPECT_EQ(12, errno
);
834 struct sock_fprog prog
;
839 struct sock_filter filter
[] = {
840 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
841 offsetof(struct seccomp_data
, nr
)),
842 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
843 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRAP
),
844 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
847 memset(&self
->prog
, 0, sizeof(self
->prog
));
848 self
->prog
.filter
= malloc(sizeof(filter
));
849 ASSERT_NE(NULL
, self
->prog
.filter
);
850 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
851 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
854 FIXTURE_TEARDOWN(TRAP
)
856 if (self
->prog
.filter
)
857 free(self
->prog
.filter
);
860 TEST_F_SIGNAL(TRAP
, dfl
, SIGSYS
)
864 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
867 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
);
869 syscall(__NR_getpid
);
872 /* Ensure that SIGSYS overrides SIG_IGN */
873 TEST_F_SIGNAL(TRAP
, ign
, SIGSYS
)
877 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
880 signal(SIGSYS
, SIG_IGN
);
882 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
);
884 syscall(__NR_getpid
);
887 static struct siginfo TRAP_info
;
888 static volatile int TRAP_nr
;
889 static void TRAP_action(int nr
, siginfo_t
*info
, void *void_context
)
891 memcpy(&TRAP_info
, info
, sizeof(TRAP_info
));
895 TEST_F(TRAP
, handler
)
898 struct sigaction act
;
901 memset(&act
, 0, sizeof(act
));
903 sigaddset(&mask
, SIGSYS
);
905 act
.sa_sigaction
= &TRAP_action
;
906 act
.sa_flags
= SA_SIGINFO
;
907 ret
= sigaction(SIGSYS
, &act
, NULL
);
909 TH_LOG("sigaction failed");
911 ret
= sigprocmask(SIG_UNBLOCK
, &mask
, NULL
);
913 TH_LOG("sigprocmask failed");
916 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
918 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
);
921 memset(&TRAP_info
, 0, sizeof(TRAP_info
));
922 /* Expect the registers to be rolled back. (nr = error) may vary
924 ret
= syscall(__NR_getpid
);
925 /* Silence gcc warning about volatile. */
927 EXPECT_EQ(SIGSYS
, test
);
928 struct local_sigsys
{
929 void *_call_addr
; /* calling user insn */
930 int _syscall
; /* triggering system call number */
931 unsigned int _arch
; /* AUDIT_ARCH_* of syscall */
932 } *sigsys
= (struct local_sigsys
*)
934 &(TRAP_info
.si_call_addr
);
938 EXPECT_EQ(__NR_getpid
, sigsys
->_syscall
);
939 /* Make sure arch is non-zero. */
940 EXPECT_NE(0, sigsys
->_arch
);
941 EXPECT_NE(0, (unsigned long)sigsys
->_call_addr
);
944 FIXTURE_DATA(precedence
) {
945 struct sock_fprog allow
;
946 struct sock_fprog log
;
947 struct sock_fprog trace
;
948 struct sock_fprog error
;
949 struct sock_fprog trap
;
950 struct sock_fprog kill
;
953 FIXTURE_SETUP(precedence
)
955 struct sock_filter allow_insns
[] = {
956 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
958 struct sock_filter log_insns
[] = {
959 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
960 offsetof(struct seccomp_data
, nr
)),
961 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
962 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
963 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_LOG
),
965 struct sock_filter trace_insns
[] = {
966 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
967 offsetof(struct seccomp_data
, nr
)),
968 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
969 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
970 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
),
972 struct sock_filter error_insns
[] = {
973 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
974 offsetof(struct seccomp_data
, nr
)),
975 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
976 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
977 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
),
979 struct sock_filter trap_insns
[] = {
980 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
981 offsetof(struct seccomp_data
, nr
)),
982 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
983 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
984 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRAP
),
986 struct sock_filter kill_insns
[] = {
987 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
988 offsetof(struct seccomp_data
, nr
)),
989 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
990 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
991 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
994 memset(self
, 0, sizeof(*self
));
995 #define FILTER_ALLOC(_x) \
996 self->_x.filter = malloc(sizeof(_x##_insns)); \
997 ASSERT_NE(NULL, self->_x.filter); \
998 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
999 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
1000 FILTER_ALLOC(allow
);
1002 FILTER_ALLOC(trace
);
1003 FILTER_ALLOC(error
);
1008 FIXTURE_TEARDOWN(precedence
)
1010 #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
1019 TEST_F(precedence
, allow_ok
)
1021 pid_t parent
, res
= 0;
1025 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1028 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1030 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1032 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1034 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1036 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1038 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->kill
);
1040 /* Should work just fine. */
1041 res
= syscall(__NR_getppid
);
1042 EXPECT_EQ(parent
, res
);
1045 TEST_F_SIGNAL(precedence
, kill_is_highest
, SIGSYS
)
1047 pid_t parent
, res
= 0;
1051 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1054 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1056 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1058 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1060 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1062 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1064 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->kill
);
1066 /* Should work just fine. */
1067 res
= syscall(__NR_getppid
);
1068 EXPECT_EQ(parent
, res
);
1069 /* getpid() should never return. */
1070 res
= syscall(__NR_getpid
);
1074 TEST_F_SIGNAL(precedence
, kill_is_highest_in_any_order
, SIGSYS
)
1080 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1083 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1085 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->kill
);
1087 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1089 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1091 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1093 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1095 /* Should work just fine. */
1096 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1097 /* getpid() should never return. */
1098 EXPECT_EQ(0, syscall(__NR_getpid
));
1101 TEST_F_SIGNAL(precedence
, trap_is_second
, SIGSYS
)
1107 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1110 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1112 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1114 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1116 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1118 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1120 /* Should work just fine. */
1121 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1122 /* getpid() should never return. */
1123 EXPECT_EQ(0, syscall(__NR_getpid
));
1126 TEST_F_SIGNAL(precedence
, trap_is_second_in_any_order
, SIGSYS
)
1132 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1135 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1137 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1139 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1141 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1143 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1145 /* Should work just fine. */
1146 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1147 /* getpid() should never return. */
1148 EXPECT_EQ(0, syscall(__NR_getpid
));
1151 TEST_F(precedence
, errno_is_third
)
1157 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1160 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1162 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1164 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1166 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1168 /* Should work just fine. */
1169 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1170 EXPECT_EQ(0, syscall(__NR_getpid
));
1173 TEST_F(precedence
, errno_is_third_in_any_order
)
1179 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1182 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1184 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1186 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1188 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1190 /* Should work just fine. */
1191 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1192 EXPECT_EQ(0, syscall(__NR_getpid
));
1195 TEST_F(precedence
, trace_is_fourth
)
1201 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1204 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1206 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1208 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1210 /* Should work just fine. */
1211 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1213 EXPECT_EQ(-1, syscall(__NR_getpid
));
1216 TEST_F(precedence
, trace_is_fourth_in_any_order
)
1222 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1225 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1227 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1229 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1231 /* Should work just fine. */
1232 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1234 EXPECT_EQ(-1, syscall(__NR_getpid
));
1237 TEST_F(precedence
, log_is_fifth
)
1239 pid_t mypid
, parent
;
1244 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1247 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1249 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1251 /* Should work just fine. */
1252 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1253 /* Should also work just fine */
1254 EXPECT_EQ(mypid
, syscall(__NR_getpid
));
1257 TEST_F(precedence
, log_is_fifth_in_any_order
)
1259 pid_t mypid
, parent
;
1264 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1267 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1269 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1271 /* Should work just fine. */
1272 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1273 /* Should also work just fine */
1274 EXPECT_EQ(mypid
, syscall(__NR_getpid
));
1277 #ifndef PTRACE_O_TRACESECCOMP
1278 #define PTRACE_O_TRACESECCOMP 0x00000080
1281 /* Catch the Ubuntu 12.04 value error. */
1282 #if PTRACE_EVENT_SECCOMP != 7
1283 #undef PTRACE_EVENT_SECCOMP
1286 #ifndef PTRACE_EVENT_SECCOMP
1287 #define PTRACE_EVENT_SECCOMP 7
1290 #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1291 bool tracer_running
;
1292 void tracer_stop(int sig
)
1294 tracer_running
= false;
1297 typedef void tracer_func_t(struct __test_metadata
*_metadata
,
1298 pid_t tracee
, int status
, void *args
);
1300 void start_tracer(struct __test_metadata
*_metadata
, int fd
, pid_t tracee
,
1301 tracer_func_t tracer_func
, void *args
, bool ptrace_syscall
)
1304 struct sigaction action
= {
1305 .sa_handler
= tracer_stop
,
1308 /* Allow external shutdown. */
1309 tracer_running
= true;
1310 ASSERT_EQ(0, sigaction(SIGUSR1
, &action
, NULL
));
1313 while (ret
== -1 && errno
!= EINVAL
)
1314 ret
= ptrace(PTRACE_ATTACH
, tracee
, NULL
, 0);
1316 kill(tracee
, SIGKILL
);
1318 /* Wait for attach stop */
1321 ret
= ptrace(PTRACE_SETOPTIONS
, tracee
, NULL
, ptrace_syscall
?
1322 PTRACE_O_TRACESYSGOOD
:
1323 PTRACE_O_TRACESECCOMP
);
1325 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1326 kill(tracee
, SIGKILL
);
1328 ret
= ptrace(ptrace_syscall
? PTRACE_SYSCALL
: PTRACE_CONT
,
1332 /* Unblock the tracee */
1333 ASSERT_EQ(1, write(fd
, "A", 1));
1334 ASSERT_EQ(0, close(fd
));
1336 /* Run until we're shut down. Must assert to stop execution. */
1337 while (tracer_running
) {
1340 if (wait(&status
) != tracee
)
1342 if (WIFSIGNALED(status
) || WIFEXITED(status
))
1343 /* Child is dead. Time to go. */
1346 /* Check if this is a seccomp event. */
1347 ASSERT_EQ(!ptrace_syscall
, IS_SECCOMP_EVENT(status
));
1349 tracer_func(_metadata
, tracee
, status
, args
);
1351 ret
= ptrace(ptrace_syscall
? PTRACE_SYSCALL
: PTRACE_CONT
,
1355 /* Directly report the status of our test harness results. */
1356 syscall(__NR_exit
, _metadata
->passed
? EXIT_SUCCESS
: EXIT_FAILURE
);
1359 /* Common tracer setup/teardown functions. */
1360 void cont_handler(int num
)
1362 pid_t
setup_trace_fixture(struct __test_metadata
*_metadata
,
1363 tracer_func_t func
, void *args
, bool ptrace_syscall
)
1368 pid_t tracee
= getpid();
1370 /* Setup a pipe for clean synchronization. */
1371 ASSERT_EQ(0, pipe(pipefd
));
1373 /* Fork a child which we'll promote to tracer */
1374 tracer_pid
= fork();
1375 ASSERT_LE(0, tracer_pid
);
1376 signal(SIGALRM
, cont_handler
);
1377 if (tracer_pid
== 0) {
1379 start_tracer(_metadata
, pipefd
[1], tracee
, func
, args
,
1381 syscall(__NR_exit
, 0);
1384 prctl(PR_SET_PTRACER
, tracer_pid
, 0, 0, 0);
1385 read(pipefd
[0], &sync
, 1);
1390 void teardown_trace_fixture(struct __test_metadata
*_metadata
,
1396 * Extract the exit code from the other process and
1397 * adopt it for ourselves in case its asserts failed.
1399 ASSERT_EQ(0, kill(tracer
, SIGUSR1
));
1400 ASSERT_EQ(tracer
, waitpid(tracer
, &status
, 0));
1401 if (WEXITSTATUS(status
))
1402 _metadata
->passed
= 0;
1406 /* "poke" tracer arguments and function. */
1407 struct tracer_args_poke_t
{
1408 unsigned long poke_addr
;
1411 void tracer_poke(struct __test_metadata
*_metadata
, pid_t tracee
, int status
,
1416 struct tracer_args_poke_t
*info
= (struct tracer_args_poke_t
*)args
;
1418 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1420 /* If this fails, don't try to recover. */
1421 ASSERT_EQ(0x1001, msg
) {
1422 kill(tracee
, SIGKILL
);
1425 * Poke in the message.
1426 * Registers are not touched to try to keep this relatively arch
1429 ret
= ptrace(PTRACE_POKEDATA
, tracee
, info
->poke_addr
, 0x1001);
1433 FIXTURE_DATA(TRACE_poke
) {
1434 struct sock_fprog prog
;
1437 struct tracer_args_poke_t tracer_args
;
1440 FIXTURE_SETUP(TRACE_poke
)
1442 struct sock_filter filter
[] = {
1443 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1444 offsetof(struct seccomp_data
, nr
)),
1445 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 0, 1),
1446 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1001),
1447 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1451 memset(&self
->prog
, 0, sizeof(self
->prog
));
1452 self
->prog
.filter
= malloc(sizeof(filter
));
1453 ASSERT_NE(NULL
, self
->prog
.filter
);
1454 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
1455 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
1457 /* Set up tracer args. */
1458 self
->tracer_args
.poke_addr
= (unsigned long)&self
->poked
;
1460 /* Launch tracer. */
1461 self
->tracer
= setup_trace_fixture(_metadata
, tracer_poke
,
1462 &self
->tracer_args
, false);
1465 FIXTURE_TEARDOWN(TRACE_poke
)
1467 teardown_trace_fixture(_metadata
, self
->tracer
);
1468 if (self
->prog
.filter
)
1469 free(self
->prog
.filter
);
1472 TEST_F(TRACE_poke
, read_has_side_effects
)
1476 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1479 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1482 EXPECT_EQ(0, self
->poked
);
1483 ret
= read(-1, NULL
, 0);
1485 EXPECT_EQ(0x1001, self
->poked
);
1488 TEST_F(TRACE_poke
, getpid_runs_normally
)
1492 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1495 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1498 EXPECT_EQ(0, self
->poked
);
1499 EXPECT_NE(0, syscall(__NR_getpid
));
1500 EXPECT_EQ(0, self
->poked
);
1503 #if defined(__x86_64__)
1504 # define ARCH_REGS struct user_regs_struct
1505 # define SYSCALL_NUM orig_rax
1506 # define SYSCALL_RET rax
1507 #elif defined(__i386__)
1508 # define ARCH_REGS struct user_regs_struct
1509 # define SYSCALL_NUM orig_eax
1510 # define SYSCALL_RET eax
1511 #elif defined(__arm__)
1512 # define ARCH_REGS struct pt_regs
1513 # define SYSCALL_NUM ARM_r7
1514 # define SYSCALL_RET ARM_r0
1515 #elif defined(__aarch64__)
1516 # define ARCH_REGS struct user_pt_regs
1517 # define SYSCALL_NUM regs[8]
1518 # define SYSCALL_RET regs[0]
1519 #elif defined(__hppa__)
1520 # define ARCH_REGS struct user_regs_struct
1521 # define SYSCALL_NUM gr[20]
1522 # define SYSCALL_RET gr[28]
1523 #elif defined(__powerpc__)
1524 # define ARCH_REGS struct pt_regs
1525 # define SYSCALL_NUM gpr[0]
1526 # define SYSCALL_RET gpr[3]
1527 #elif defined(__s390__)
1528 # define ARCH_REGS s390_regs
1529 # define SYSCALL_NUM gprs[2]
1530 # define SYSCALL_RET gprs[2]
1531 #elif defined(__mips__)
1532 # define ARCH_REGS struct pt_regs
1533 # define SYSCALL_NUM regs[2]
1534 # define SYSCALL_SYSCALL_NUM regs[4]
1535 # define SYSCALL_RET regs[2]
1536 # define SYSCALL_NUM_RET_SHARE_REG
1538 # error "Do not know how to find your architecture's registers and syscalls"
1541 /* When the syscall return can't be changed, stub out the tests for it. */
1542 #ifdef SYSCALL_NUM_RET_SHARE_REG
1543 # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
1545 # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(val, action)
1548 /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
1549 * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
1551 #if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
1552 #define HAVE_GETREGS
1555 /* Architecture-specific syscall fetching routine. */
1556 int get_syscall(struct __test_metadata
*_metadata
, pid_t tracee
)
1560 EXPECT_EQ(0, ptrace(PTRACE_GETREGS
, tracee
, 0, ®s
)) {
1561 TH_LOG("PTRACE_GETREGS failed");
1567 iov
.iov_base
= ®s
;
1568 iov
.iov_len
= sizeof(regs
);
1569 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET
, tracee
, NT_PRSTATUS
, &iov
)) {
1570 TH_LOG("PTRACE_GETREGSET failed");
1575 #if defined(__mips__)
1576 if (regs
.SYSCALL_NUM
== __NR_O32_Linux
)
1577 return regs
.SYSCALL_SYSCALL_NUM
;
1579 return regs
.SYSCALL_NUM
;
1582 /* Architecture-specific syscall changing routine. */
1583 void change_syscall(struct __test_metadata
*_metadata
,
1584 pid_t tracee
, int syscall
)
1589 ret
= ptrace(PTRACE_GETREGS
, tracee
, 0, ®s
);
1592 iov
.iov_base
= ®s
;
1593 iov
.iov_len
= sizeof(regs
);
1594 ret
= ptrace(PTRACE_GETREGSET
, tracee
, NT_PRSTATUS
, &iov
);
1596 EXPECT_EQ(0, ret
) {}
1598 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1599 defined(__s390__) || defined(__hppa__)
1601 regs
.SYSCALL_NUM
= syscall
;
1603 #elif defined(__mips__)
1605 if (regs
.SYSCALL_NUM
== __NR_O32_Linux
)
1606 regs
.SYSCALL_SYSCALL_NUM
= syscall
;
1608 regs
.SYSCALL_NUM
= syscall
;
1611 #elif defined(__arm__)
1612 # ifndef PTRACE_SET_SYSCALL
1613 # define PTRACE_SET_SYSCALL 23
1616 ret
= ptrace(PTRACE_SET_SYSCALL
, tracee
, NULL
, syscall
);
1620 #elif defined(__aarch64__)
1621 # ifndef NT_ARM_SYSTEM_CALL
1622 # define NT_ARM_SYSTEM_CALL 0x404
1625 iov
.iov_base
= &syscall
;
1626 iov
.iov_len
= sizeof(syscall
);
1627 ret
= ptrace(PTRACE_SETREGSET
, tracee
, NT_ARM_SYSTEM_CALL
,
1634 TH_LOG("How is the syscall changed on this architecture?");
1638 /* If syscall is skipped, change return value. */
1640 #ifdef SYSCALL_NUM_RET_SHARE_REG
1641 TH_LOG("Can't modify syscall return on this architecture");
1643 regs
.SYSCALL_RET
= EPERM
;
1647 ret
= ptrace(PTRACE_SETREGS
, tracee
, 0, ®s
);
1649 iov
.iov_base
= ®s
;
1650 iov
.iov_len
= sizeof(regs
);
1651 ret
= ptrace(PTRACE_SETREGSET
, tracee
, NT_PRSTATUS
, &iov
);
1656 void tracer_syscall(struct __test_metadata
*_metadata
, pid_t tracee
,
1657 int status
, void *args
)
1662 /* Make sure we got the right message. */
1663 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1666 /* Validate and take action on expected syscalls. */
1669 /* change getpid to getppid. */
1670 EXPECT_EQ(__NR_getpid
, get_syscall(_metadata
, tracee
));
1671 change_syscall(_metadata
, tracee
, __NR_getppid
);
1675 EXPECT_EQ(__NR_gettid
, get_syscall(_metadata
, tracee
));
1676 change_syscall(_metadata
, tracee
, -1);
1679 /* do nothing (allow getppid) */
1680 EXPECT_EQ(__NR_getppid
, get_syscall(_metadata
, tracee
));
1684 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg
);
1685 kill(tracee
, SIGKILL
);
1691 void tracer_ptrace(struct __test_metadata
*_metadata
, pid_t tracee
,
1692 int status
, void *args
)
1698 /* Make sure we got an empty message. */
1699 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1703 /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
1708 nr
= get_syscall(_metadata
, tracee
);
1710 if (nr
== __NR_getpid
)
1711 change_syscall(_metadata
, tracee
, __NR_getppid
);
1712 if (nr
== __NR_open
)
1713 change_syscall(_metadata
, tracee
, -1);
1716 FIXTURE_DATA(TRACE_syscall
) {
1717 struct sock_fprog prog
;
1718 pid_t tracer
, mytid
, mypid
, parent
;
1721 FIXTURE_SETUP(TRACE_syscall
)
1723 struct sock_filter filter
[] = {
1724 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1725 offsetof(struct seccomp_data
, nr
)),
1726 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
1727 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1002),
1728 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_gettid
, 0, 1),
1729 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1003),
1730 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1731 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1004),
1732 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1735 memset(&self
->prog
, 0, sizeof(self
->prog
));
1736 self
->prog
.filter
= malloc(sizeof(filter
));
1737 ASSERT_NE(NULL
, self
->prog
.filter
);
1738 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
1739 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
1741 /* Prepare some testable syscall results. */
1742 self
->mytid
= syscall(__NR_gettid
);
1743 ASSERT_GT(self
->mytid
, 0);
1744 ASSERT_NE(self
->mytid
, 1) {
1745 TH_LOG("Running this test as init is not supported. :)");
1748 self
->mypid
= getpid();
1749 ASSERT_GT(self
->mypid
, 0);
1750 ASSERT_EQ(self
->mytid
, self
->mypid
);
1752 self
->parent
= getppid();
1753 ASSERT_GT(self
->parent
, 0);
1754 ASSERT_NE(self
->parent
, self
->mypid
);
1756 /* Launch tracer. */
1757 self
->tracer
= setup_trace_fixture(_metadata
, tracer_syscall
, NULL
,
1761 FIXTURE_TEARDOWN(TRACE_syscall
)
1763 teardown_trace_fixture(_metadata
, self
->tracer
);
1764 if (self
->prog
.filter
)
1765 free(self
->prog
.filter
);
1768 TEST_F(TRACE_syscall
, ptrace_syscall_redirected
)
1770 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1771 teardown_trace_fixture(_metadata
, self
->tracer
);
1772 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1775 /* Tracer will redirect getpid to getppid. */
1776 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1779 TEST_F(TRACE_syscall
, ptrace_syscall_dropped
)
1781 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1782 teardown_trace_fixture(_metadata
, self
->tracer
);
1783 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1786 /* Tracer should skip the open syscall, resulting in EPERM. */
1787 EXPECT_SYSCALL_RETURN(EPERM
, syscall(__NR_open
));
1790 TEST_F(TRACE_syscall
, syscall_allowed
)
1794 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1797 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1800 /* getppid works as expected (no changes). */
1801 EXPECT_EQ(self
->parent
, syscall(__NR_getppid
));
1802 EXPECT_NE(self
->mypid
, syscall(__NR_getppid
));
1805 TEST_F(TRACE_syscall
, syscall_redirected
)
1809 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1812 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1815 /* getpid has been redirected to getppid as expected. */
1816 EXPECT_EQ(self
->parent
, syscall(__NR_getpid
));
1817 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1820 TEST_F(TRACE_syscall
, syscall_dropped
)
1824 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1827 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1830 /* gettid has been skipped and an altered return value stored. */
1831 EXPECT_SYSCALL_RETURN(EPERM
, syscall(__NR_gettid
));
1832 EXPECT_NE(self
->mytid
, syscall(__NR_gettid
));
1835 TEST_F(TRACE_syscall
, skip_after_RET_TRACE
)
1837 struct sock_filter filter
[] = {
1838 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1839 offsetof(struct seccomp_data
, nr
)),
1840 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1841 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EPERM
),
1842 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1844 struct sock_fprog prog
= {
1845 .len
= (unsigned short)ARRAY_SIZE(filter
),
1850 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1853 /* Install fixture filter. */
1854 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1857 /* Install "errno on getppid" filter. */
1858 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1861 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
1863 EXPECT_EQ(-1, syscall(__NR_getpid
));
1864 EXPECT_EQ(EPERM
, errno
);
1867 TEST_F_SIGNAL(TRACE_syscall
, kill_after_RET_TRACE
, SIGSYS
)
1869 struct sock_filter filter
[] = {
1870 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1871 offsetof(struct seccomp_data
, nr
)),
1872 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1873 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1874 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1876 struct sock_fprog prog
= {
1877 .len
= (unsigned short)ARRAY_SIZE(filter
),
1882 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1885 /* Install fixture filter. */
1886 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1889 /* Install "death on getppid" filter. */
1890 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1893 /* Tracer will redirect getpid to getppid, and we should die. */
1894 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1897 TEST_F(TRACE_syscall
, skip_after_ptrace
)
1899 struct sock_filter filter
[] = {
1900 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1901 offsetof(struct seccomp_data
, nr
)),
1902 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1903 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EPERM
),
1904 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1906 struct sock_fprog prog
= {
1907 .len
= (unsigned short)ARRAY_SIZE(filter
),
1912 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1913 teardown_trace_fixture(_metadata
, self
->tracer
);
1914 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1917 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1920 /* Install "errno on getppid" filter. */
1921 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1924 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
1925 EXPECT_EQ(-1, syscall(__NR_getpid
));
1926 EXPECT_EQ(EPERM
, errno
);
1929 TEST_F_SIGNAL(TRACE_syscall
, kill_after_ptrace
, SIGSYS
)
1931 struct sock_filter filter
[] = {
1932 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1933 offsetof(struct seccomp_data
, nr
)),
1934 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1935 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1936 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1938 struct sock_fprog prog
= {
1939 .len
= (unsigned short)ARRAY_SIZE(filter
),
1944 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1945 teardown_trace_fixture(_metadata
, self
->tracer
);
1946 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1949 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1952 /* Install "death on getppid" filter. */
1953 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1956 /* Tracer will redirect getpid to getppid, and we should die. */
1957 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1960 TEST(seccomp_syscall
)
1962 struct sock_filter filter
[] = {
1963 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1965 struct sock_fprog prog
= {
1966 .len
= (unsigned short)ARRAY_SIZE(filter
),
1971 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1973 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
1976 /* Reject insane operation. */
1977 ret
= seccomp(-1, 0, &prog
);
1978 ASSERT_NE(ENOSYS
, errno
) {
1979 TH_LOG("Kernel does not support seccomp syscall!");
1981 EXPECT_EQ(EINVAL
, errno
) {
1982 TH_LOG("Did not reject crazy op value!");
1985 /* Reject strict with flags or pointer. */
1986 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, -1, NULL
);
1987 EXPECT_EQ(EINVAL
, errno
) {
1988 TH_LOG("Did not reject mode strict with flags!");
1990 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, 0, &prog
);
1991 EXPECT_EQ(EINVAL
, errno
) {
1992 TH_LOG("Did not reject mode strict with uargs!");
1995 /* Reject insane args for filter. */
1996 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, -1, &prog
);
1997 EXPECT_EQ(EINVAL
, errno
) {
1998 TH_LOG("Did not reject crazy filter flags!");
2000 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, NULL
);
2001 EXPECT_EQ(EFAULT
, errno
) {
2002 TH_LOG("Did not reject NULL filter!");
2005 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
2006 EXPECT_EQ(0, errno
) {
2007 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
2012 TEST(seccomp_syscall_mode_lock
)
2014 struct sock_filter filter
[] = {
2015 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2017 struct sock_fprog prog
= {
2018 .len
= (unsigned short)ARRAY_SIZE(filter
),
2023 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
2025 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2028 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
2029 ASSERT_NE(ENOSYS
, errno
) {
2030 TH_LOG("Kernel does not support seccomp syscall!");
2033 TH_LOG("Could not install filter!");
2036 /* Make sure neither entry point will switch to strict. */
2037 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, 0, 0, 0);
2038 EXPECT_EQ(EINVAL
, errno
) {
2039 TH_LOG("Switched to mode strict!");
2042 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, 0, NULL
);
2043 EXPECT_EQ(EINVAL
, errno
) {
2044 TH_LOG("Switched to mode strict!");
2049 * Test detection of known and unknown filter flags. Userspace needs to be able
2050 * to check if a filter flag is supported by the current kernel and a good way
2051 * of doing that is by attempting to enter filter mode, with the flag bit in
2052 * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
2053 * that the flag is valid and EINVAL indicates that the flag is invalid.
2055 TEST(detect_seccomp_filter_flags
)
2057 unsigned int flags
[] = { SECCOMP_FILTER_FLAG_TSYNC
,
2058 SECCOMP_FILTER_FLAG_LOG
};
2059 unsigned int flag
, all_flags
;
2063 /* Test detection of known-good filter flags */
2064 for (i
= 0, all_flags
= 0; i
< ARRAY_SIZE(flags
); i
++) {
2066 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2067 ASSERT_NE(ENOSYS
, errno
) {
2068 TH_LOG("Kernel does not support seccomp syscall!");
2071 EXPECT_EQ(EFAULT
, errno
) {
2072 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
2079 /* Test detection of all known-good filter flags */
2080 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, all_flags
, NULL
);
2082 EXPECT_EQ(EFAULT
, errno
) {
2083 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
2087 /* Test detection of an unknown filter flag */
2089 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2091 EXPECT_EQ(EINVAL
, errno
) {
2092 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
2097 * Test detection of an unknown filter flag that may simply need to be
2098 * added to this test
2100 flag
= flags
[ARRAY_SIZE(flags
) - 1] << 1;
2101 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2103 EXPECT_EQ(EINVAL
, errno
) {
2104 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?",
2111 struct sock_filter filter
[] = {
2112 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2114 struct sock_fprog prog
= {
2115 .len
= (unsigned short)ARRAY_SIZE(filter
),
2120 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
2122 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2125 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2127 ASSERT_NE(ENOSYS
, errno
) {
2128 TH_LOG("Kernel does not support seccomp syscall!");
2131 TH_LOG("Could not install initial filter with TSYNC!");
2135 #define TSYNC_SIBLINGS 2
2136 struct tsync_sibling
{
2140 pthread_cond_t
*cond
;
2141 pthread_mutex_t
*mutex
;
2144 struct sock_fprog
*prog
;
2145 struct __test_metadata
*metadata
;
2149 * To avoid joining joined threads (which is not allowed by Bionic),
2150 * make sure we both successfully join and clear the tid to skip a
2151 * later join attempt during fixture teardown. Any remaining threads
2152 * will be directly killed during teardown.
2154 #define PTHREAD_JOIN(tid, status) \
2156 int _rc = pthread_join(tid, status); \
2158 TH_LOG("pthread_join of tid %u failed: %d\n", \
2159 (unsigned int)tid, _rc); \
2165 FIXTURE_DATA(TSYNC
) {
2166 struct sock_fprog root_prog
, apply_prog
;
2167 struct tsync_sibling sibling
[TSYNC_SIBLINGS
];
2169 pthread_cond_t cond
;
2170 pthread_mutex_t mutex
;
2174 FIXTURE_SETUP(TSYNC
)
2176 struct sock_filter root_filter
[] = {
2177 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2179 struct sock_filter apply_filter
[] = {
2180 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2181 offsetof(struct seccomp_data
, nr
)),
2182 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 0, 1),
2183 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2184 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2187 memset(&self
->root_prog
, 0, sizeof(self
->root_prog
));
2188 memset(&self
->apply_prog
, 0, sizeof(self
->apply_prog
));
2189 memset(&self
->sibling
, 0, sizeof(self
->sibling
));
2190 self
->root_prog
.filter
= malloc(sizeof(root_filter
));
2191 ASSERT_NE(NULL
, self
->root_prog
.filter
);
2192 memcpy(self
->root_prog
.filter
, &root_filter
, sizeof(root_filter
));
2193 self
->root_prog
.len
= (unsigned short)ARRAY_SIZE(root_filter
);
2195 self
->apply_prog
.filter
= malloc(sizeof(apply_filter
));
2196 ASSERT_NE(NULL
, self
->apply_prog
.filter
);
2197 memcpy(self
->apply_prog
.filter
, &apply_filter
, sizeof(apply_filter
));
2198 self
->apply_prog
.len
= (unsigned short)ARRAY_SIZE(apply_filter
);
2200 self
->sibling_count
= 0;
2201 pthread_mutex_init(&self
->mutex
, NULL
);
2202 pthread_cond_init(&self
->cond
, NULL
);
2203 sem_init(&self
->started
, 0, 0);
2204 self
->sibling
[0].tid
= 0;
2205 self
->sibling
[0].cond
= &self
->cond
;
2206 self
->sibling
[0].started
= &self
->started
;
2207 self
->sibling
[0].mutex
= &self
->mutex
;
2208 self
->sibling
[0].diverge
= 0;
2209 self
->sibling
[0].num_waits
= 1;
2210 self
->sibling
[0].prog
= &self
->root_prog
;
2211 self
->sibling
[0].metadata
= _metadata
;
2212 self
->sibling
[1].tid
= 0;
2213 self
->sibling
[1].cond
= &self
->cond
;
2214 self
->sibling
[1].started
= &self
->started
;
2215 self
->sibling
[1].mutex
= &self
->mutex
;
2216 self
->sibling
[1].diverge
= 0;
2217 self
->sibling
[1].prog
= &self
->root_prog
;
2218 self
->sibling
[1].num_waits
= 1;
2219 self
->sibling
[1].metadata
= _metadata
;
2222 FIXTURE_TEARDOWN(TSYNC
)
2226 if (self
->root_prog
.filter
)
2227 free(self
->root_prog
.filter
);
2228 if (self
->apply_prog
.filter
)
2229 free(self
->apply_prog
.filter
);
2231 for ( ; sib
< self
->sibling_count
; ++sib
) {
2232 struct tsync_sibling
*s
= &self
->sibling
[sib
];
2237 * If a thread is still running, it may be stuck, so hit
2238 * it over the head really hard.
2240 pthread_kill(s
->tid
, 9);
2242 pthread_mutex_destroy(&self
->mutex
);
2243 pthread_cond_destroy(&self
->cond
);
2244 sem_destroy(&self
->started
);
2247 void *tsync_sibling(void *data
)
2250 struct tsync_sibling
*me
= data
;
2252 me
->system_tid
= syscall(__NR_gettid
);
2254 pthread_mutex_lock(me
->mutex
);
2256 /* Just re-apply the root prog to fork the tree */
2257 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
,
2260 sem_post(me
->started
);
2261 /* Return outside of started so parent notices failures. */
2263 pthread_mutex_unlock(me
->mutex
);
2264 return (void *)SIBLING_EXIT_FAILURE
;
2267 pthread_cond_wait(me
->cond
, me
->mutex
);
2268 me
->num_waits
= me
->num_waits
- 1;
2269 } while (me
->num_waits
);
2270 pthread_mutex_unlock(me
->mutex
);
2272 ret
= prctl(PR_GET_NO_NEW_PRIVS
, 0, 0, 0, 0);
2274 return (void *)SIBLING_EXIT_NEWPRIVS
;
2276 return (void *)SIBLING_EXIT_UNKILLED
;
2279 void tsync_start_sibling(struct tsync_sibling
*sibling
)
2281 pthread_create(&sibling
->tid
, NULL
, tsync_sibling
, (void *)sibling
);
2284 TEST_F(TSYNC
, siblings_fail_prctl
)
2288 struct sock_filter filter
[] = {
2289 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2290 offsetof(struct seccomp_data
, nr
)),
2291 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
2292 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EINVAL
),
2293 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2295 struct sock_fprog prog
= {
2296 .len
= (unsigned short)ARRAY_SIZE(filter
),
2300 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2301 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2304 /* Check prctl failure detection by requesting sib 0 diverge. */
2305 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
2306 ASSERT_NE(ENOSYS
, errno
) {
2307 TH_LOG("Kernel does not support seccomp syscall!");
2310 TH_LOG("setting filter failed");
2313 self
->sibling
[0].diverge
= 1;
2314 tsync_start_sibling(&self
->sibling
[0]);
2315 tsync_start_sibling(&self
->sibling
[1]);
2317 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2318 sem_wait(&self
->started
);
2319 self
->sibling_count
++;
2322 /* Signal the threads to clean up*/
2323 pthread_mutex_lock(&self
->mutex
);
2324 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2325 TH_LOG("cond broadcast non-zero");
2327 pthread_mutex_unlock(&self
->mutex
);
2329 /* Ensure diverging sibling failed to call prctl. */
2330 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2331 EXPECT_EQ(SIBLING_EXIT_FAILURE
, (long)status
);
2332 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2333 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2336 TEST_F(TSYNC
, two_siblings_with_ancestor
)
2341 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2342 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2345 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2346 ASSERT_NE(ENOSYS
, errno
) {
2347 TH_LOG("Kernel does not support seccomp syscall!");
2350 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2352 tsync_start_sibling(&self
->sibling
[0]);
2353 tsync_start_sibling(&self
->sibling
[1]);
2355 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2356 sem_wait(&self
->started
);
2357 self
->sibling_count
++;
2360 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2363 TH_LOG("Could install filter on all threads!");
2365 /* Tell the siblings to test the policy */
2366 pthread_mutex_lock(&self
->mutex
);
2367 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2368 TH_LOG("cond broadcast non-zero");
2370 pthread_mutex_unlock(&self
->mutex
);
2371 /* Ensure they are both killed and don't exit cleanly. */
2372 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2373 EXPECT_EQ(0x0, (long)status
);
2374 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2375 EXPECT_EQ(0x0, (long)status
);
2378 TEST_F(TSYNC
, two_sibling_want_nnp
)
2382 /* start siblings before any prctl() operations */
2383 tsync_start_sibling(&self
->sibling
[0]);
2384 tsync_start_sibling(&self
->sibling
[1]);
2385 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2386 sem_wait(&self
->started
);
2387 self
->sibling_count
++;
2390 /* Tell the siblings to test no policy */
2391 pthread_mutex_lock(&self
->mutex
);
2392 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2393 TH_LOG("cond broadcast non-zero");
2395 pthread_mutex_unlock(&self
->mutex
);
2397 /* Ensure they are both upset about lacking nnp. */
2398 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2399 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS
, (long)status
);
2400 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2401 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS
, (long)status
);
2404 TEST_F(TSYNC
, two_siblings_with_no_filter
)
2409 /* start siblings before any prctl() operations */
2410 tsync_start_sibling(&self
->sibling
[0]);
2411 tsync_start_sibling(&self
->sibling
[1]);
2412 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2413 sem_wait(&self
->started
);
2414 self
->sibling_count
++;
2417 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2418 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2421 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2423 ASSERT_NE(ENOSYS
, errno
) {
2424 TH_LOG("Kernel does not support seccomp syscall!");
2427 TH_LOG("Could install filter on all threads!");
2430 /* Tell the siblings to test the policy */
2431 pthread_mutex_lock(&self
->mutex
);
2432 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2433 TH_LOG("cond broadcast non-zero");
2435 pthread_mutex_unlock(&self
->mutex
);
2437 /* Ensure they are both killed and don't exit cleanly. */
2438 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2439 EXPECT_EQ(0x0, (long)status
);
2440 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2441 EXPECT_EQ(0x0, (long)status
);
2444 TEST_F(TSYNC
, two_siblings_with_one_divergence
)
2449 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2450 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2453 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2454 ASSERT_NE(ENOSYS
, errno
) {
2455 TH_LOG("Kernel does not support seccomp syscall!");
2458 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2460 self
->sibling
[0].diverge
= 1;
2461 tsync_start_sibling(&self
->sibling
[0]);
2462 tsync_start_sibling(&self
->sibling
[1]);
2464 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2465 sem_wait(&self
->started
);
2466 self
->sibling_count
++;
2469 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2471 ASSERT_EQ(self
->sibling
[0].system_tid
, ret
) {
2472 TH_LOG("Did not fail on diverged sibling.");
2475 /* Wake the threads */
2476 pthread_mutex_lock(&self
->mutex
);
2477 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2478 TH_LOG("cond broadcast non-zero");
2480 pthread_mutex_unlock(&self
->mutex
);
2482 /* Ensure they are both unkilled. */
2483 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2484 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2485 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2486 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2489 TEST_F(TSYNC
, two_siblings_not_under_filter
)
2494 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2495 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2499 * Sibling 0 will have its own seccomp policy
2500 * and Sibling 1 will not be under seccomp at
2501 * all. Sibling 1 will enter seccomp and 0
2502 * will cause failure.
2504 self
->sibling
[0].diverge
= 1;
2505 tsync_start_sibling(&self
->sibling
[0]);
2506 tsync_start_sibling(&self
->sibling
[1]);
2508 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2509 sem_wait(&self
->started
);
2510 self
->sibling_count
++;
2513 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2514 ASSERT_NE(ENOSYS
, errno
) {
2515 TH_LOG("Kernel does not support seccomp syscall!");
2518 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2521 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2523 ASSERT_EQ(ret
, self
->sibling
[0].system_tid
) {
2524 TH_LOG("Did not fail on diverged sibling.");
2527 if (ret
== self
->sibling
[0].system_tid
)
2530 pthread_mutex_lock(&self
->mutex
);
2532 /* Increment the other siblings num_waits so we can clean up
2533 * the one we just saw.
2535 self
->sibling
[!sib
].num_waits
+= 1;
2537 /* Signal the thread to clean up*/
2538 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2539 TH_LOG("cond broadcast non-zero");
2541 pthread_mutex_unlock(&self
->mutex
);
2542 PTHREAD_JOIN(self
->sibling
[sib
].tid
, &status
);
2543 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2544 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2545 while (!kill(self
->sibling
[sib
].system_tid
, 0))
2547 /* Switch to the remaining sibling */
2550 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2553 TH_LOG("Expected the remaining sibling to sync");
2556 pthread_mutex_lock(&self
->mutex
);
2558 /* If remaining sibling didn't have a chance to wake up during
2559 * the first broadcast, manually reduce the num_waits now.
2561 if (self
->sibling
[sib
].num_waits
> 1)
2562 self
->sibling
[sib
].num_waits
= 1;
2563 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2564 TH_LOG("cond broadcast non-zero");
2566 pthread_mutex_unlock(&self
->mutex
);
2567 PTHREAD_JOIN(self
->sibling
[sib
].tid
, &status
);
2568 EXPECT_EQ(0, (long)status
);
2569 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2570 while (!kill(self
->sibling
[sib
].system_tid
, 0))
2573 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2575 ASSERT_EQ(0, ret
); /* just us chickens */
2578 /* Make sure restarted syscalls are seen directly as "restart_syscall". */
2579 TEST(syscall_restart
)
2586 siginfo_t info
= { };
2587 struct sock_filter filter
[] = {
2588 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2589 offsetof(struct seccomp_data
, nr
)),
2591 #ifdef __NR_sigreturn
2592 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_sigreturn
, 6, 0),
2594 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 5, 0),
2595 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_exit
, 4, 0),
2596 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_rt_sigreturn
, 3, 0),
2597 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_nanosleep
, 4, 0),
2598 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_restart_syscall
, 4, 0),
2600 /* Allow __NR_write for easy logging. */
2601 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_write
, 0, 1),
2602 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2603 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2604 /* The nanosleep jump target. */
2605 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
|0x100),
2606 /* The restart_syscall jump target. */
2607 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
|0x200),
2609 struct sock_fprog prog
= {
2610 .len
= (unsigned short)ARRAY_SIZE(filter
),
2613 #if defined(__arm__)
2614 struct utsname utsbuf
;
2617 ASSERT_EQ(0, pipe(pipefd
));
2620 ASSERT_LE(0, child_pid
);
2621 if (child_pid
== 0) {
2622 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2624 struct timespec timeout
= { };
2626 /* Attach parent as tracer and stop. */
2627 EXPECT_EQ(0, ptrace(PTRACE_TRACEME
));
2628 EXPECT_EQ(0, raise(SIGSTOP
));
2630 EXPECT_EQ(0, close(pipefd
[1]));
2632 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2633 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2636 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
2638 TH_LOG("Failed to install filter!");
2641 EXPECT_EQ(1, read(pipefd
[0], &buf
, 1)) {
2642 TH_LOG("Failed to read() sync from parent");
2644 EXPECT_EQ('.', buf
) {
2645 TH_LOG("Failed to get sync data from read()");
2648 /* Start nanosleep to be interrupted. */
2651 EXPECT_EQ(0, nanosleep(&timeout
, NULL
)) {
2652 TH_LOG("Call to nanosleep() failed (errno %d)", errno
);
2655 /* Read final sync from parent. */
2656 EXPECT_EQ(1, read(pipefd
[0], &buf
, 1)) {
2657 TH_LOG("Failed final read() from parent");
2659 EXPECT_EQ('!', buf
) {
2660 TH_LOG("Failed to get final data from read()");
2663 /* Directly report the status of our test harness results. */
2664 syscall(__NR_exit
, _metadata
->passed
? EXIT_SUCCESS
2667 EXPECT_EQ(0, close(pipefd
[0]));
2669 /* Attach to child, setup options, and release. */
2670 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2671 ASSERT_EQ(true, WIFSTOPPED(status
));
2672 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS
, child_pid
, NULL
,
2673 PTRACE_O_TRACESECCOMP
));
2674 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2675 ASSERT_EQ(1, write(pipefd
[1], ".", 1));
2677 /* Wait for nanosleep() to start. */
2678 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2679 ASSERT_EQ(true, WIFSTOPPED(status
));
2680 ASSERT_EQ(SIGTRAP
, WSTOPSIG(status
));
2681 ASSERT_EQ(PTRACE_EVENT_SECCOMP
, (status
>> 16));
2682 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG
, child_pid
, NULL
, &msg
));
2683 ASSERT_EQ(0x100, msg
);
2684 EXPECT_EQ(__NR_nanosleep
, get_syscall(_metadata
, child_pid
));
2686 /* Might as well check siginfo for sanity while we're here. */
2687 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO
, child_pid
, NULL
, &info
));
2688 ASSERT_EQ(SIGTRAP
, info
.si_signo
);
2689 ASSERT_EQ(SIGTRAP
| (PTRACE_EVENT_SECCOMP
<< 8), info
.si_code
);
2690 EXPECT_EQ(0, info
.si_errno
);
2691 EXPECT_EQ(getuid(), info
.si_uid
);
2692 /* Verify signal delivery came from child (seccomp-triggered). */
2693 EXPECT_EQ(child_pid
, info
.si_pid
);
2695 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
2696 ASSERT_EQ(0, kill(child_pid
, SIGSTOP
));
2697 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2698 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2699 ASSERT_EQ(true, WIFSTOPPED(status
));
2700 ASSERT_EQ(SIGSTOP
, WSTOPSIG(status
));
2701 /* Verify signal delivery came from parent now. */
2702 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO
, child_pid
, NULL
, &info
));
2703 EXPECT_EQ(getpid(), info
.si_pid
);
2705 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
2706 ASSERT_EQ(0, kill(child_pid
, SIGCONT
));
2707 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2708 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2709 ASSERT_EQ(true, WIFSTOPPED(status
));
2710 ASSERT_EQ(SIGCONT
, WSTOPSIG(status
));
2711 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2713 /* Wait for restart_syscall() to start. */
2714 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2715 ASSERT_EQ(true, WIFSTOPPED(status
));
2716 ASSERT_EQ(SIGTRAP
, WSTOPSIG(status
));
2717 ASSERT_EQ(PTRACE_EVENT_SECCOMP
, (status
>> 16));
2718 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG
, child_pid
, NULL
, &msg
));
2720 ASSERT_EQ(0x200, msg
);
2721 ret
= get_syscall(_metadata
, child_pid
);
2722 #if defined(__arm__)
2725 * - native ARM registers do NOT expose true syscall.
2726 * - compat ARM registers on ARM64 DO expose true syscall.
2728 ASSERT_EQ(0, uname(&utsbuf
));
2729 if (strncmp(utsbuf
.machine
, "arm", 3) == 0) {
2730 EXPECT_EQ(__NR_nanosleep
, ret
);
2734 EXPECT_EQ(__NR_restart_syscall
, ret
);
2737 /* Write again to end test. */
2738 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2739 ASSERT_EQ(1, write(pipefd
[1], "!", 1));
2740 EXPECT_EQ(0, close(pipefd
[1]));
2742 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2743 if (WIFSIGNALED(status
) || WEXITSTATUS(status
))
2744 _metadata
->passed
= 0;
2747 TEST_SIGNAL(filter_flag_log
, SIGSYS
)
2749 struct sock_filter allow_filter
[] = {
2750 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2752 struct sock_filter kill_filter
[] = {
2753 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2754 offsetof(struct seccomp_data
, nr
)),
2755 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
2756 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2757 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2759 struct sock_fprog allow_prog
= {
2760 .len
= (unsigned short)ARRAY_SIZE(allow_filter
),
2761 .filter
= allow_filter
,
2763 struct sock_fprog kill_prog
= {
2764 .len
= (unsigned short)ARRAY_SIZE(kill_filter
),
2765 .filter
= kill_filter
,
2768 pid_t parent
= getppid();
2770 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
2773 /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */
2774 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, SECCOMP_FILTER_FLAG_LOG
,
2776 ASSERT_NE(ENOSYS
, errno
) {
2777 TH_LOG("Kernel does not support seccomp syscall!");
2780 TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
2782 EXPECT_EQ(EINVAL
, errno
) {
2783 TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
2786 /* Verify that a simple, permissive filter can be added with no flags */
2787 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &allow_prog
);
2790 /* See if the same filter can be added with the FILTER_FLAG_LOG flag */
2791 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_LOG
,
2793 ASSERT_NE(EINVAL
, errno
) {
2794 TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
2798 /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */
2799 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_LOG
,
2803 EXPECT_EQ(parent
, syscall(__NR_getppid
));
2804 /* getpid() should never return. */
2805 EXPECT_EQ(0, syscall(__NR_getpid
));
2808 TEST(get_action_avail
)
2810 __u32 actions
[] = { SECCOMP_RET_KILL_THREAD
, SECCOMP_RET_TRAP
,
2811 SECCOMP_RET_ERRNO
, SECCOMP_RET_TRACE
,
2812 SECCOMP_RET_LOG
, SECCOMP_RET_ALLOW
};
2813 __u32 unknown_action
= 0x10000000U
;
2817 ret
= seccomp(SECCOMP_GET_ACTION_AVAIL
, 0, &actions
[0]);
2818 ASSERT_NE(ENOSYS
, errno
) {
2819 TH_LOG("Kernel does not support seccomp syscall!");
2821 ASSERT_NE(EINVAL
, errno
) {
2822 TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
2826 for (i
= 0; i
< ARRAY_SIZE(actions
); i
++) {
2827 ret
= seccomp(SECCOMP_GET_ACTION_AVAIL
, 0, &actions
[i
]);
2829 TH_LOG("Expected action (0x%X) not available!",
2834 /* Check that an unknown action is handled properly (EOPNOTSUPP) */
2835 ret
= seccomp(SECCOMP_GET_ACTION_AVAIL
, 0, &unknown_action
);
2837 EXPECT_EQ(errno
, EOPNOTSUPP
);
2842 * - add microbenchmarks
2843 * - expand NNP testing
2844 * - better arch-specific TRACE and TRAP handlers.
2845 * - endianness checking when appropriate
2846 * - 64-bit arg prodding
2847 * - arch value testing (x86 modes especially)
2848 * - verify that FILTER_FLAG_LOG filters generate log messages
2849 * - verify that RET_LOG generates log messages