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.
12 * glibc 2.26 and later have SIGSYS in siginfo_t. Before that,
13 * we need to use the kernel's siginfo.h file and trick glibc
16 #if !__GLIBC_PREREQ(2, 26)
17 # include <asm/siginfo.h>
18 # define __have_siginfo_t 1
19 # define __have_sigval_t 1
20 # define __have_sigevent_t 1
24 #include <linux/filter.h>
25 #include <sys/prctl.h>
26 #include <sys/ptrace.h>
28 #include <linux/prctl.h>
29 #include <linux/ptrace.h>
30 #include <linux/seccomp.h>
32 #include <semaphore.h>
38 #include <linux/elf.h>
40 #include <sys/utsname.h>
41 #include <sys/fcntl.h>
43 #include <sys/times.h>
44 #include <sys/socket.h>
45 #include <sys/ioctl.h>
48 #include <sys/syscall.h>
51 #include "../kselftest_harness.h"
53 #ifndef PR_SET_PTRACER
54 # define PR_SET_PTRACER 0x59616d61
57 #ifndef PR_SET_NO_NEW_PRIVS
58 #define PR_SET_NO_NEW_PRIVS 38
59 #define PR_GET_NO_NEW_PRIVS 39
62 #ifndef PR_SECCOMP_EXT
63 #define PR_SECCOMP_EXT 43
66 #ifndef SECCOMP_EXT_ACT
67 #define SECCOMP_EXT_ACT 1
70 #ifndef SECCOMP_EXT_ACT_TSYNC
71 #define SECCOMP_EXT_ACT_TSYNC 1
74 #ifndef SECCOMP_MODE_STRICT
75 #define SECCOMP_MODE_STRICT 1
78 #ifndef SECCOMP_MODE_FILTER
79 #define SECCOMP_MODE_FILTER 2
82 #ifndef SECCOMP_RET_ALLOW
86 __u64 instruction_pointer
;
91 #ifndef SECCOMP_RET_KILL_PROCESS
92 #define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */
93 #define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */
95 #ifndef SECCOMP_RET_KILL
96 #define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
97 #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
98 #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
99 #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
100 #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
102 #ifndef SECCOMP_RET_LOG
103 #define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */
107 # if defined(__i386__)
108 # define __NR_seccomp 354
109 # elif defined(__x86_64__)
110 # define __NR_seccomp 317
111 # elif defined(__arm__)
112 # define __NR_seccomp 383
113 # elif defined(__aarch64__)
114 # define __NR_seccomp 277
115 # elif defined(__hppa__)
116 # define __NR_seccomp 338
117 # elif defined(__powerpc__)
118 # define __NR_seccomp 358
119 # elif defined(__s390__)
120 # define __NR_seccomp 348
122 # warning "seccomp syscall number unknown for this architecture"
123 # define __NR_seccomp 0xffff
127 #ifndef SECCOMP_SET_MODE_STRICT
128 #define SECCOMP_SET_MODE_STRICT 0
131 #ifndef SECCOMP_SET_MODE_FILTER
132 #define SECCOMP_SET_MODE_FILTER 1
135 #ifndef SECCOMP_GET_ACTION_AVAIL
136 #define SECCOMP_GET_ACTION_AVAIL 2
139 #ifndef SECCOMP_GET_NOTIF_SIZES
140 #define SECCOMP_GET_NOTIF_SIZES 3
143 #ifndef SECCOMP_FILTER_FLAG_TSYNC
144 #define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0)
147 #ifndef SECCOMP_FILTER_FLAG_LOG
148 #define SECCOMP_FILTER_FLAG_LOG (1UL << 1)
151 #ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW
152 #define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2)
155 #ifndef PTRACE_SECCOMP_GET_METADATA
156 #define PTRACE_SECCOMP_GET_METADATA 0x420d
158 struct seccomp_metadata
{
159 __u64 filter_off
; /* Input: which filter */
160 __u64 flags
; /* Output: filter's flags */
164 #ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER
165 #define SECCOMP_FILTER_FLAG_NEW_LISTENER (1UL << 3)
167 #define SECCOMP_RET_USER_NOTIF 0x7fc00000U
169 #define SECCOMP_IOC_MAGIC '!'
170 #define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr)
171 #define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type)
172 #define SECCOMP_IOW(nr, type) _IOW(SECCOMP_IOC_MAGIC, nr, type)
173 #define SECCOMP_IOWR(nr, type) _IOWR(SECCOMP_IOC_MAGIC, nr, type)
175 /* Flags for seccomp notification fd ioctl. */
176 #define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
177 #define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
178 struct seccomp_notif_resp)
179 #define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
181 struct seccomp_notif
{
185 struct seccomp_data data
;
188 struct seccomp_notif_resp
{
195 struct seccomp_notif_sizes
{
197 __u16 seccomp_notif_resp
;
203 int seccomp(unsigned int op
, unsigned int flags
, void *args
)
206 return syscall(__NR_seccomp
, op
, flags
, args
);
210 #if __BYTE_ORDER == __LITTLE_ENDIAN
211 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
212 #elif __BYTE_ORDER == __BIG_ENDIAN
213 #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
215 #error "wut? Unknown __BYTE_ORDER?!"
218 #define SIBLING_EXIT_UNKILLED 0xbadbeef
219 #define SIBLING_EXIT_FAILURE 0xbadface
220 #define SIBLING_EXIT_NEWPRIVS 0xbadfeed
222 TEST(mode_strict_support
)
226 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, NULL
, NULL
, NULL
);
228 TH_LOG("Kernel does not support CONFIG_SECCOMP");
230 syscall(__NR_exit
, 0);
233 TEST_SIGNAL(mode_strict_cannot_call_prctl
, SIGKILL
)
237 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, NULL
, NULL
, NULL
);
239 TH_LOG("Kernel does not support CONFIG_SECCOMP");
241 syscall(__NR_prctl
, PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
,
244 TH_LOG("Unreachable!");
248 /* Note! This doesn't test no new privs behavior */
249 TEST(no_new_privs_support
)
253 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
255 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
259 /* Tests kernel support by checking for a copy_from_user() fault on NULL. */
260 TEST(mode_filter_support
)
264 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
266 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
268 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, NULL
, NULL
, NULL
);
270 EXPECT_EQ(EFAULT
, errno
) {
271 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
275 TEST(mode_filter_without_nnp
)
277 struct sock_filter filter
[] = {
278 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
280 struct sock_fprog prog
= {
281 .len
= (unsigned short)ARRAY_SIZE(filter
),
286 ret
= prctl(PR_GET_NO_NEW_PRIVS
, 0, NULL
, 0, 0);
288 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
291 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
292 /* Succeeds with CAP_SYS_ADMIN, fails without */
293 /* TODO(wad) check caps not euid */
296 EXPECT_EQ(EACCES
, errno
);
302 #define MAX_INSNS_PER_PATH 32768
304 TEST(filter_size_limits
)
307 int count
= BPF_MAXINSNS
+ 1;
308 struct sock_filter allow
[] = {
309 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
311 struct sock_filter
*filter
;
312 struct sock_fprog prog
= { };
315 filter
= calloc(count
, sizeof(*filter
));
316 ASSERT_NE(NULL
, filter
);
318 for (i
= 0; i
< count
; i
++)
319 filter
[i
] = allow
[0];
321 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
324 prog
.filter
= filter
;
327 /* Too many filter instructions in a single filter. */
328 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
330 TH_LOG("Installing %d insn filter was allowed", prog
.len
);
333 /* One less is okay, though. */
335 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
337 TH_LOG("Installing %d insn filter wasn't allowed", prog
.len
);
341 TEST(filter_chain_limits
)
344 int count
= BPF_MAXINSNS
;
345 struct sock_filter allow
[] = {
346 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
348 struct sock_filter
*filter
;
349 struct sock_fprog prog
= { };
352 filter
= calloc(count
, sizeof(*filter
));
353 ASSERT_NE(NULL
, filter
);
355 for (i
= 0; i
< count
; i
++)
356 filter
[i
] = allow
[0];
358 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
361 prog
.filter
= filter
;
364 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
369 /* Too many total filter instructions. */
370 for (i
= 0; i
< MAX_INSNS_PER_PATH
; i
++) {
371 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
376 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
377 i
, count
, i
* (count
+ 4));
381 TEST(mode_filter_cannot_move_to_strict
)
383 struct sock_filter filter
[] = {
384 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
386 struct sock_fprog prog
= {
387 .len
= (unsigned short)ARRAY_SIZE(filter
),
392 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
395 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
398 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, NULL
, 0, 0);
400 EXPECT_EQ(EINVAL
, errno
);
404 TEST(mode_filter_get_seccomp
)
406 struct sock_filter filter
[] = {
407 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
409 struct sock_fprog prog
= {
410 .len
= (unsigned short)ARRAY_SIZE(filter
),
415 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
418 ret
= prctl(PR_GET_SECCOMP
, 0, 0, 0, 0);
421 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
424 ret
= prctl(PR_GET_SECCOMP
, 0, 0, 0, 0);
431 struct sock_filter filter
[] = {
432 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
434 struct sock_fprog prog
= {
435 .len
= (unsigned short)ARRAY_SIZE(filter
),
440 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
443 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
449 struct sock_filter filter
[] = {
451 struct sock_fprog prog
= {
452 .len
= (unsigned short)ARRAY_SIZE(filter
),
457 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
460 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
462 EXPECT_EQ(EINVAL
, errno
);
467 struct sock_filter filter
[] = {
468 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_LOG
),
470 struct sock_fprog prog
= {
471 .len
= (unsigned short)ARRAY_SIZE(filter
),
475 pid_t parent
= getppid();
477 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
480 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
483 /* getppid() should succeed and be logged (no check for logging) */
484 EXPECT_EQ(parent
, syscall(__NR_getppid
));
487 TEST_SIGNAL(unknown_ret_is_kill_inside
, SIGSYS
)
489 struct sock_filter filter
[] = {
490 BPF_STMT(BPF_RET
|BPF_K
, 0x10000000U
),
492 struct sock_fprog prog
= {
493 .len
= (unsigned short)ARRAY_SIZE(filter
),
498 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
501 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
503 EXPECT_EQ(0, syscall(__NR_getpid
)) {
504 TH_LOG("getpid() shouldn't ever return");
508 /* return code >= 0x80000000 is unused. */
509 TEST_SIGNAL(unknown_ret_is_kill_above_allow
, SIGSYS
)
511 struct sock_filter filter
[] = {
512 BPF_STMT(BPF_RET
|BPF_K
, 0x90000000U
),
514 struct sock_fprog prog
= {
515 .len
= (unsigned short)ARRAY_SIZE(filter
),
520 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
523 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
525 EXPECT_EQ(0, syscall(__NR_getpid
)) {
526 TH_LOG("getpid() shouldn't ever return");
530 TEST_SIGNAL(KILL_all
, SIGSYS
)
532 struct sock_filter filter
[] = {
533 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
535 struct sock_fprog prog
= {
536 .len
= (unsigned short)ARRAY_SIZE(filter
),
541 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
544 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
548 TEST_SIGNAL(KILL_one
, SIGSYS
)
550 struct sock_filter filter
[] = {
551 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
552 offsetof(struct seccomp_data
, nr
)),
553 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
554 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
555 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
557 struct sock_fprog prog
= {
558 .len
= (unsigned short)ARRAY_SIZE(filter
),
562 pid_t parent
= getppid();
564 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
567 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
570 EXPECT_EQ(parent
, syscall(__NR_getppid
));
571 /* getpid() should never return. */
572 EXPECT_EQ(0, syscall(__NR_getpid
));
575 TEST_SIGNAL(KILL_one_arg_one
, SIGSYS
)
578 struct sock_filter filter
[] = {
579 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
580 offsetof(struct seccomp_data
, nr
)),
581 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_times
, 1, 0),
582 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
583 /* Only both with lower 32-bit for now. */
584 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
, syscall_arg(0)),
585 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
,
586 (unsigned long)&fatal_address
, 0, 1),
587 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
588 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
590 struct sock_fprog prog
= {
591 .len
= (unsigned short)ARRAY_SIZE(filter
),
595 pid_t parent
= getppid();
597 clock_t clock
= times(&timebuf
);
599 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
602 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
605 EXPECT_EQ(parent
, syscall(__NR_getppid
));
606 EXPECT_LE(clock
, syscall(__NR_times
, &timebuf
));
607 /* times() should never return. */
608 EXPECT_EQ(0, syscall(__NR_times
, &fatal_address
));
611 TEST_SIGNAL(KILL_one_arg_six
, SIGSYS
)
614 int sysno
= __NR_mmap
;
616 int sysno
= __NR_mmap2
;
618 struct sock_filter filter
[] = {
619 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
620 offsetof(struct seccomp_data
, nr
)),
621 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, sysno
, 1, 0),
622 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
623 /* Only both with lower 32-bit for now. */
624 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
, syscall_arg(5)),
625 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, 0x0C0FFEE, 0, 1),
626 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
627 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
629 struct sock_fprog prog
= {
630 .len
= (unsigned short)ARRAY_SIZE(filter
),
634 pid_t parent
= getppid();
637 int page_size
= sysconf(_SC_PAGESIZE
);
639 ASSERT_LT(0, page_size
);
641 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
644 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
647 fd
= open("/dev/zero", O_RDONLY
);
650 EXPECT_EQ(parent
, syscall(__NR_getppid
));
651 map1
= (void *)syscall(sysno
,
652 NULL
, page_size
, PROT_READ
, MAP_PRIVATE
, fd
, page_size
);
653 EXPECT_NE(MAP_FAILED
, map1
);
654 /* mmap2() should never return. */
655 map2
= (void *)syscall(sysno
,
656 NULL
, page_size
, PROT_READ
, MAP_PRIVATE
, fd
, 0x0C0FFEE);
657 EXPECT_EQ(MAP_FAILED
, map2
);
659 /* The test failed, so clean up the resources. */
660 munmap(map1
, page_size
);
661 munmap(map2
, page_size
);
665 /* This is a thread task to die via seccomp filter violation. */
666 void *kill_thread(void *data
)
668 bool die
= (bool)data
;
671 prctl(PR_GET_SECCOMP
, 0, 0, 0, 0);
672 return (void *)SIBLING_EXIT_FAILURE
;
675 return (void *)SIBLING_EXIT_UNKILLED
;
678 /* Prepare a thread that will kill itself or both of us. */
679 void kill_thread_or_group(struct __test_metadata
*_metadata
, bool kill_process
)
683 /* Kill only when calling __NR_prctl. */
684 struct sock_filter filter_thread
[] = {
685 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
686 offsetof(struct seccomp_data
, nr
)),
687 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
688 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL_THREAD
),
689 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
691 struct sock_fprog prog_thread
= {
692 .len
= (unsigned short)ARRAY_SIZE(filter_thread
),
693 .filter
= filter_thread
,
695 struct sock_filter filter_process
[] = {
696 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
697 offsetof(struct seccomp_data
, nr
)),
698 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
699 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL_PROCESS
),
700 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
702 struct sock_fprog prog_process
= {
703 .len
= (unsigned short)ARRAY_SIZE(filter_process
),
704 .filter
= filter_process
,
707 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
708 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
711 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER
, 0,
712 kill_process
? &prog_process
: &prog_thread
));
715 * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS
716 * flag cannot be downgraded by a new filter.
718 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog_thread
));
720 /* Start a thread that will exit immediately. */
721 ASSERT_EQ(0, pthread_create(&thread
, NULL
, kill_thread
, (void *)false));
722 ASSERT_EQ(0, pthread_join(thread
, &status
));
723 ASSERT_EQ(SIBLING_EXIT_UNKILLED
, (unsigned long)status
);
725 /* Start a thread that will die immediately. */
726 ASSERT_EQ(0, pthread_create(&thread
, NULL
, kill_thread
, (void *)true));
727 ASSERT_EQ(0, pthread_join(thread
, &status
));
728 ASSERT_NE(SIBLING_EXIT_FAILURE
, (unsigned long)status
);
731 * If we get here, only the spawned thread died. Let the parent know
732 * the whole process didn't die (i.e. this thread, the spawner,
744 ASSERT_LE(0, child_pid
);
745 if (child_pid
== 0) {
746 kill_thread_or_group(_metadata
, false);
750 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
752 /* If only the thread was killed, we'll see exit 42. */
753 ASSERT_TRUE(WIFEXITED(status
));
754 ASSERT_EQ(42, WEXITSTATUS(status
));
763 ASSERT_LE(0, child_pid
);
764 if (child_pid
== 0) {
765 kill_thread_or_group(_metadata
, true);
769 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
771 /* If the entire process was killed, we'll see SIGSYS. */
772 ASSERT_TRUE(WIFSIGNALED(status
));
773 ASSERT_EQ(SIGSYS
, WTERMSIG(status
));
776 /* TODO(wad) add 64-bit versus 32-bit arg tests. */
777 TEST(arg_out_of_range
)
779 struct sock_filter filter
[] = {
780 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
, syscall_arg(6)),
781 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
783 struct sock_fprog prog
= {
784 .len
= (unsigned short)ARRAY_SIZE(filter
),
789 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
792 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
);
794 EXPECT_EQ(EINVAL
, errno
);
797 #define ERRNO_FILTER(name, errno) \
798 struct sock_filter _read_filter_##name[] = { \
799 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
800 offsetof(struct seccomp_data, nr)), \
801 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
802 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
803 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
805 struct sock_fprog prog_##name = { \
806 .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
807 .filter = _read_filter_##name, \
810 /* Make sure basic errno values are correctly passed through a filter. */
813 ERRNO_FILTER(valid
, E2BIG
);
815 pid_t parent
= getppid();
817 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
820 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_valid
);
823 EXPECT_EQ(parent
, syscall(__NR_getppid
));
824 EXPECT_EQ(-1, read(0, NULL
, 0));
825 EXPECT_EQ(E2BIG
, errno
);
828 /* Make sure an errno of zero is correctly handled by the arch code. */
831 ERRNO_FILTER(zero
, 0);
833 pid_t parent
= getppid();
835 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
838 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_zero
);
841 EXPECT_EQ(parent
, syscall(__NR_getppid
));
842 /* "errno" of 0 is ok. */
843 EXPECT_EQ(0, read(0, NULL
, 0));
847 * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller.
848 * This tests that the errno value gets capped correctly, fixed by
849 * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO").
853 ERRNO_FILTER(capped
, 4096);
855 pid_t parent
= getppid();
857 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
860 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_capped
);
863 EXPECT_EQ(parent
, syscall(__NR_getppid
));
864 EXPECT_EQ(-1, read(0, NULL
, 0));
865 EXPECT_EQ(4095, errno
);
869 * Filters are processed in reverse order: last applied is executed first.
870 * Since only the SECCOMP_RET_ACTION mask is tested for return values, the
871 * SECCOMP_RET_DATA mask results will follow the most recently applied
872 * matching filter return (and not the lowest or highest value).
876 ERRNO_FILTER(first
, 11);
877 ERRNO_FILTER(second
, 13);
878 ERRNO_FILTER(third
, 12);
880 pid_t parent
= getppid();
882 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
885 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_first
);
888 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_second
);
891 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog_third
);
894 EXPECT_EQ(parent
, syscall(__NR_getppid
));
895 EXPECT_EQ(-1, read(0, NULL
, 0));
896 EXPECT_EQ(12, errno
);
900 struct sock_fprog prog
;
905 struct sock_filter filter
[] = {
906 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
907 offsetof(struct seccomp_data
, nr
)),
908 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
909 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRAP
),
910 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
913 memset(&self
->prog
, 0, sizeof(self
->prog
));
914 self
->prog
.filter
= malloc(sizeof(filter
));
915 ASSERT_NE(NULL
, self
->prog
.filter
);
916 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
917 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
920 FIXTURE_TEARDOWN(TRAP
)
922 if (self
->prog
.filter
)
923 free(self
->prog
.filter
);
926 TEST_F_SIGNAL(TRAP
, dfl
, SIGSYS
)
930 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
933 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
);
935 syscall(__NR_getpid
);
938 /* Ensure that SIGSYS overrides SIG_IGN */
939 TEST_F_SIGNAL(TRAP
, ign
, SIGSYS
)
943 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
946 signal(SIGSYS
, SIG_IGN
);
948 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
);
950 syscall(__NR_getpid
);
953 static siginfo_t TRAP_info
;
954 static volatile int TRAP_nr
;
955 static void TRAP_action(int nr
, siginfo_t
*info
, void *void_context
)
957 memcpy(&TRAP_info
, info
, sizeof(TRAP_info
));
961 TEST_F(TRAP
, handler
)
964 struct sigaction act
;
967 memset(&act
, 0, sizeof(act
));
969 sigaddset(&mask
, SIGSYS
);
971 act
.sa_sigaction
= &TRAP_action
;
972 act
.sa_flags
= SA_SIGINFO
;
973 ret
= sigaction(SIGSYS
, &act
, NULL
);
975 TH_LOG("sigaction failed");
977 ret
= sigprocmask(SIG_UNBLOCK
, &mask
, NULL
);
979 TH_LOG("sigprocmask failed");
982 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
984 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
);
987 memset(&TRAP_info
, 0, sizeof(TRAP_info
));
988 /* Expect the registers to be rolled back. (nr = error) may vary
990 ret
= syscall(__NR_getpid
);
991 /* Silence gcc warning about volatile. */
993 EXPECT_EQ(SIGSYS
, test
);
994 struct local_sigsys
{
995 void *_call_addr
; /* calling user insn */
996 int _syscall
; /* triggering system call number */
997 unsigned int _arch
; /* AUDIT_ARCH_* of syscall */
998 } *sigsys
= (struct local_sigsys
*)
1000 &(TRAP_info
.si_call_addr
);
1004 EXPECT_EQ(__NR_getpid
, sigsys
->_syscall
);
1005 /* Make sure arch is non-zero. */
1006 EXPECT_NE(0, sigsys
->_arch
);
1007 EXPECT_NE(0, (unsigned long)sigsys
->_call_addr
);
1010 FIXTURE_DATA(precedence
) {
1011 struct sock_fprog allow
;
1012 struct sock_fprog log
;
1013 struct sock_fprog trace
;
1014 struct sock_fprog error
;
1015 struct sock_fprog trap
;
1016 struct sock_fprog kill
;
1019 FIXTURE_SETUP(precedence
)
1021 struct sock_filter allow_insns
[] = {
1022 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1024 struct sock_filter log_insns
[] = {
1025 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1026 offsetof(struct seccomp_data
, nr
)),
1027 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
1028 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1029 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_LOG
),
1031 struct sock_filter trace_insns
[] = {
1032 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1033 offsetof(struct seccomp_data
, nr
)),
1034 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
1035 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1036 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
),
1038 struct sock_filter error_insns
[] = {
1039 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1040 offsetof(struct seccomp_data
, nr
)),
1041 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
1042 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1043 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
),
1045 struct sock_filter trap_insns
[] = {
1046 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1047 offsetof(struct seccomp_data
, nr
)),
1048 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
1049 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1050 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRAP
),
1052 struct sock_filter kill_insns
[] = {
1053 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1054 offsetof(struct seccomp_data
, nr
)),
1055 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 1, 0),
1056 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1057 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1060 memset(self
, 0, sizeof(*self
));
1061 #define FILTER_ALLOC(_x) \
1062 self->_x.filter = malloc(sizeof(_x##_insns)); \
1063 ASSERT_NE(NULL, self->_x.filter); \
1064 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
1065 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
1066 FILTER_ALLOC(allow
);
1068 FILTER_ALLOC(trace
);
1069 FILTER_ALLOC(error
);
1074 FIXTURE_TEARDOWN(precedence
)
1076 #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
1085 TEST_F(precedence
, allow_ok
)
1087 pid_t parent
, res
= 0;
1091 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1094 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1096 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1098 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1100 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1102 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1104 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->kill
);
1106 /* Should work just fine. */
1107 res
= syscall(__NR_getppid
);
1108 EXPECT_EQ(parent
, res
);
1111 TEST_F_SIGNAL(precedence
, kill_is_highest
, SIGSYS
)
1113 pid_t parent
, res
= 0;
1117 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1120 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1122 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1124 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1126 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1128 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1130 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->kill
);
1132 /* Should work just fine. */
1133 res
= syscall(__NR_getppid
);
1134 EXPECT_EQ(parent
, res
);
1135 /* getpid() should never return. */
1136 res
= syscall(__NR_getpid
);
1140 TEST_F_SIGNAL(precedence
, kill_is_highest_in_any_order
, SIGSYS
)
1146 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1149 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1151 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->kill
);
1153 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1155 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1157 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1159 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1161 /* Should work just fine. */
1162 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1163 /* getpid() should never return. */
1164 EXPECT_EQ(0, syscall(__NR_getpid
));
1167 TEST_F_SIGNAL(precedence
, trap_is_second
, SIGSYS
)
1173 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1176 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1178 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1180 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1182 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1184 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1186 /* Should work just fine. */
1187 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1188 /* getpid() should never return. */
1189 EXPECT_EQ(0, syscall(__NR_getpid
));
1192 TEST_F_SIGNAL(precedence
, trap_is_second_in_any_order
, SIGSYS
)
1198 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1201 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1203 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trap
);
1205 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1207 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1209 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1211 /* Should work just fine. */
1212 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1213 /* getpid() should never return. */
1214 EXPECT_EQ(0, syscall(__NR_getpid
));
1217 TEST_F(precedence
, errno_is_third
)
1223 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1226 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1228 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1230 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1232 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1234 /* Should work just fine. */
1235 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1236 EXPECT_EQ(0, syscall(__NR_getpid
));
1239 TEST_F(precedence
, errno_is_third_in_any_order
)
1245 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1248 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1250 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->error
);
1252 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1254 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1256 /* Should work just fine. */
1257 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1258 EXPECT_EQ(0, syscall(__NR_getpid
));
1261 TEST_F(precedence
, trace_is_fourth
)
1267 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1270 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1272 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1274 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1276 /* Should work just fine. */
1277 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1279 EXPECT_EQ(-1, syscall(__NR_getpid
));
1282 TEST_F(precedence
, trace_is_fourth_in_any_order
)
1288 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1291 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->trace
);
1293 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1295 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1297 /* Should work just fine. */
1298 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1300 EXPECT_EQ(-1, syscall(__NR_getpid
));
1303 TEST_F(precedence
, log_is_fifth
)
1305 pid_t mypid
, parent
;
1310 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1313 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1315 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1317 /* Should work just fine. */
1318 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1319 /* Should also work just fine */
1320 EXPECT_EQ(mypid
, syscall(__NR_getpid
));
1323 TEST_F(precedence
, log_is_fifth_in_any_order
)
1325 pid_t mypid
, parent
;
1330 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1333 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->log
);
1335 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->allow
);
1337 /* Should work just fine. */
1338 EXPECT_EQ(parent
, syscall(__NR_getppid
));
1339 /* Should also work just fine */
1340 EXPECT_EQ(mypid
, syscall(__NR_getpid
));
1343 #ifndef PTRACE_O_TRACESECCOMP
1344 #define PTRACE_O_TRACESECCOMP 0x00000080
1347 /* Catch the Ubuntu 12.04 value error. */
1348 #if PTRACE_EVENT_SECCOMP != 7
1349 #undef PTRACE_EVENT_SECCOMP
1352 #ifndef PTRACE_EVENT_SECCOMP
1353 #define PTRACE_EVENT_SECCOMP 7
1356 #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1357 bool tracer_running
;
1358 void tracer_stop(int sig
)
1360 tracer_running
= false;
1363 typedef void tracer_func_t(struct __test_metadata
*_metadata
,
1364 pid_t tracee
, int status
, void *args
);
1366 void start_tracer(struct __test_metadata
*_metadata
, int fd
, pid_t tracee
,
1367 tracer_func_t tracer_func
, void *args
, bool ptrace_syscall
)
1370 struct sigaction action
= {
1371 .sa_handler
= tracer_stop
,
1374 /* Allow external shutdown. */
1375 tracer_running
= true;
1376 ASSERT_EQ(0, sigaction(SIGUSR1
, &action
, NULL
));
1379 while (ret
== -1 && errno
!= EINVAL
)
1380 ret
= ptrace(PTRACE_ATTACH
, tracee
, NULL
, 0);
1382 kill(tracee
, SIGKILL
);
1384 /* Wait for attach stop */
1387 ret
= ptrace(PTRACE_SETOPTIONS
, tracee
, NULL
, ptrace_syscall
?
1388 PTRACE_O_TRACESYSGOOD
:
1389 PTRACE_O_TRACESECCOMP
);
1391 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1392 kill(tracee
, SIGKILL
);
1394 ret
= ptrace(ptrace_syscall
? PTRACE_SYSCALL
: PTRACE_CONT
,
1398 /* Unblock the tracee */
1399 ASSERT_EQ(1, write(fd
, "A", 1));
1400 ASSERT_EQ(0, close(fd
));
1402 /* Run until we're shut down. Must assert to stop execution. */
1403 while (tracer_running
) {
1406 if (wait(&status
) != tracee
)
1408 if (WIFSIGNALED(status
) || WIFEXITED(status
))
1409 /* Child is dead. Time to go. */
1412 /* Check if this is a seccomp event. */
1413 ASSERT_EQ(!ptrace_syscall
, IS_SECCOMP_EVENT(status
));
1415 tracer_func(_metadata
, tracee
, status
, args
);
1417 ret
= ptrace(ptrace_syscall
? PTRACE_SYSCALL
: PTRACE_CONT
,
1421 /* Directly report the status of our test harness results. */
1422 syscall(__NR_exit
, _metadata
->passed
? EXIT_SUCCESS
: EXIT_FAILURE
);
1425 /* Common tracer setup/teardown functions. */
1426 void cont_handler(int num
)
1428 pid_t
setup_trace_fixture(struct __test_metadata
*_metadata
,
1429 tracer_func_t func
, void *args
, bool ptrace_syscall
)
1434 pid_t tracee
= getpid();
1436 /* Setup a pipe for clean synchronization. */
1437 ASSERT_EQ(0, pipe(pipefd
));
1439 /* Fork a child which we'll promote to tracer */
1440 tracer_pid
= fork();
1441 ASSERT_LE(0, tracer_pid
);
1442 signal(SIGALRM
, cont_handler
);
1443 if (tracer_pid
== 0) {
1445 start_tracer(_metadata
, pipefd
[1], tracee
, func
, args
,
1447 syscall(__NR_exit
, 0);
1450 prctl(PR_SET_PTRACER
, tracer_pid
, 0, 0, 0);
1451 read(pipefd
[0], &sync
, 1);
1456 void teardown_trace_fixture(struct __test_metadata
*_metadata
,
1462 * Extract the exit code from the other process and
1463 * adopt it for ourselves in case its asserts failed.
1465 ASSERT_EQ(0, kill(tracer
, SIGUSR1
));
1466 ASSERT_EQ(tracer
, waitpid(tracer
, &status
, 0));
1467 if (WEXITSTATUS(status
))
1468 _metadata
->passed
= 0;
1472 /* "poke" tracer arguments and function. */
1473 struct tracer_args_poke_t
{
1474 unsigned long poke_addr
;
1477 void tracer_poke(struct __test_metadata
*_metadata
, pid_t tracee
, int status
,
1482 struct tracer_args_poke_t
*info
= (struct tracer_args_poke_t
*)args
;
1484 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1486 /* If this fails, don't try to recover. */
1487 ASSERT_EQ(0x1001, msg
) {
1488 kill(tracee
, SIGKILL
);
1491 * Poke in the message.
1492 * Registers are not touched to try to keep this relatively arch
1495 ret
= ptrace(PTRACE_POKEDATA
, tracee
, info
->poke_addr
, 0x1001);
1499 FIXTURE_DATA(TRACE_poke
) {
1500 struct sock_fprog prog
;
1503 struct tracer_args_poke_t tracer_args
;
1506 FIXTURE_SETUP(TRACE_poke
)
1508 struct sock_filter filter
[] = {
1509 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1510 offsetof(struct seccomp_data
, nr
)),
1511 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 0, 1),
1512 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1001),
1513 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1517 memset(&self
->prog
, 0, sizeof(self
->prog
));
1518 self
->prog
.filter
= malloc(sizeof(filter
));
1519 ASSERT_NE(NULL
, self
->prog
.filter
);
1520 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
1521 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
1523 /* Set up tracer args. */
1524 self
->tracer_args
.poke_addr
= (unsigned long)&self
->poked
;
1526 /* Launch tracer. */
1527 self
->tracer
= setup_trace_fixture(_metadata
, tracer_poke
,
1528 &self
->tracer_args
, false);
1531 FIXTURE_TEARDOWN(TRACE_poke
)
1533 teardown_trace_fixture(_metadata
, self
->tracer
);
1534 if (self
->prog
.filter
)
1535 free(self
->prog
.filter
);
1538 TEST_F(TRACE_poke
, read_has_side_effects
)
1542 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1545 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1548 EXPECT_EQ(0, self
->poked
);
1549 ret
= read(-1, NULL
, 0);
1551 EXPECT_EQ(0x1001, self
->poked
);
1554 TEST_F(TRACE_poke
, getpid_runs_normally
)
1558 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1561 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1564 EXPECT_EQ(0, self
->poked
);
1565 EXPECT_NE(0, syscall(__NR_getpid
));
1566 EXPECT_EQ(0, self
->poked
);
1569 #if defined(__x86_64__)
1570 # define ARCH_REGS struct user_regs_struct
1571 # define SYSCALL_NUM orig_rax
1572 # define SYSCALL_RET rax
1573 #elif defined(__i386__)
1574 # define ARCH_REGS struct user_regs_struct
1575 # define SYSCALL_NUM orig_eax
1576 # define SYSCALL_RET eax
1577 #elif defined(__arm__)
1578 # define ARCH_REGS struct pt_regs
1579 # define SYSCALL_NUM ARM_r7
1580 # define SYSCALL_RET ARM_r0
1581 #elif defined(__aarch64__)
1582 # define ARCH_REGS struct user_pt_regs
1583 # define SYSCALL_NUM regs[8]
1584 # define SYSCALL_RET regs[0]
1585 #elif defined(__hppa__)
1586 # define ARCH_REGS struct user_regs_struct
1587 # define SYSCALL_NUM gr[20]
1588 # define SYSCALL_RET gr[28]
1589 #elif defined(__powerpc__)
1590 # define ARCH_REGS struct pt_regs
1591 # define SYSCALL_NUM gpr[0]
1592 # define SYSCALL_RET gpr[3]
1593 #elif defined(__s390__)
1594 # define ARCH_REGS s390_regs
1595 # define SYSCALL_NUM gprs[2]
1596 # define SYSCALL_RET gprs[2]
1597 #elif defined(__mips__)
1598 # define ARCH_REGS struct pt_regs
1599 # define SYSCALL_NUM regs[2]
1600 # define SYSCALL_SYSCALL_NUM regs[4]
1601 # define SYSCALL_RET regs[2]
1602 # define SYSCALL_NUM_RET_SHARE_REG
1604 # error "Do not know how to find your architecture's registers and syscalls"
1607 /* When the syscall return can't be changed, stub out the tests for it. */
1608 #ifdef SYSCALL_NUM_RET_SHARE_REG
1609 # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
1611 # define EXPECT_SYSCALL_RETURN(val, action) \
1615 EXPECT_EQ(-1, action); \
1616 EXPECT_EQ(-(val), errno); \
1618 EXPECT_EQ(val, action); \
1623 /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
1624 * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
1626 #if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
1627 #define HAVE_GETREGS
1630 /* Architecture-specific syscall fetching routine. */
1631 int get_syscall(struct __test_metadata
*_metadata
, pid_t tracee
)
1635 EXPECT_EQ(0, ptrace(PTRACE_GETREGS
, tracee
, 0, ®s
)) {
1636 TH_LOG("PTRACE_GETREGS failed");
1642 iov
.iov_base
= ®s
;
1643 iov
.iov_len
= sizeof(regs
);
1644 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET
, tracee
, NT_PRSTATUS
, &iov
)) {
1645 TH_LOG("PTRACE_GETREGSET failed");
1650 #if defined(__mips__)
1651 if (regs
.SYSCALL_NUM
== __NR_O32_Linux
)
1652 return regs
.SYSCALL_SYSCALL_NUM
;
1654 return regs
.SYSCALL_NUM
;
1657 /* Architecture-specific syscall changing routine. */
1658 void change_syscall(struct __test_metadata
*_metadata
,
1659 pid_t tracee
, int syscall
, int result
)
1664 ret
= ptrace(PTRACE_GETREGS
, tracee
, 0, ®s
);
1667 iov
.iov_base
= ®s
;
1668 iov
.iov_len
= sizeof(regs
);
1669 ret
= ptrace(PTRACE_GETREGSET
, tracee
, NT_PRSTATUS
, &iov
);
1671 EXPECT_EQ(0, ret
) {}
1673 #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
1674 defined(__s390__) || defined(__hppa__)
1676 regs
.SYSCALL_NUM
= syscall
;
1678 #elif defined(__mips__)
1680 if (regs
.SYSCALL_NUM
== __NR_O32_Linux
)
1681 regs
.SYSCALL_SYSCALL_NUM
= syscall
;
1683 regs
.SYSCALL_NUM
= syscall
;
1686 #elif defined(__arm__)
1687 # ifndef PTRACE_SET_SYSCALL
1688 # define PTRACE_SET_SYSCALL 23
1691 ret
= ptrace(PTRACE_SET_SYSCALL
, tracee
, NULL
, syscall
);
1695 #elif defined(__aarch64__)
1696 # ifndef NT_ARM_SYSTEM_CALL
1697 # define NT_ARM_SYSTEM_CALL 0x404
1700 iov
.iov_base
= &syscall
;
1701 iov
.iov_len
= sizeof(syscall
);
1702 ret
= ptrace(PTRACE_SETREGSET
, tracee
, NT_ARM_SYSTEM_CALL
,
1709 TH_LOG("How is the syscall changed on this architecture?");
1713 /* If syscall is skipped, change return value. */
1715 #ifdef SYSCALL_NUM_RET_SHARE_REG
1716 TH_LOG("Can't modify syscall return on this architecture");
1718 regs
.SYSCALL_RET
= result
;
1722 ret
= ptrace(PTRACE_SETREGS
, tracee
, 0, ®s
);
1724 iov
.iov_base
= ®s
;
1725 iov
.iov_len
= sizeof(regs
);
1726 ret
= ptrace(PTRACE_SETREGSET
, tracee
, NT_PRSTATUS
, &iov
);
1731 void tracer_syscall(struct __test_metadata
*_metadata
, pid_t tracee
,
1732 int status
, void *args
)
1737 /* Make sure we got the right message. */
1738 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1741 /* Validate and take action on expected syscalls. */
1744 /* change getpid to getppid. */
1745 EXPECT_EQ(__NR_getpid
, get_syscall(_metadata
, tracee
));
1746 change_syscall(_metadata
, tracee
, __NR_getppid
, 0);
1749 /* skip gettid with valid return code. */
1750 EXPECT_EQ(__NR_gettid
, get_syscall(_metadata
, tracee
));
1751 change_syscall(_metadata
, tracee
, -1, 45000);
1754 /* skip openat with error. */
1755 EXPECT_EQ(__NR_openat
, get_syscall(_metadata
, tracee
));
1756 change_syscall(_metadata
, tracee
, -1, -ESRCH
);
1759 /* do nothing (allow getppid) */
1760 EXPECT_EQ(__NR_getppid
, get_syscall(_metadata
, tracee
));
1764 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg
);
1765 kill(tracee
, SIGKILL
);
1771 void tracer_ptrace(struct __test_metadata
*_metadata
, pid_t tracee
,
1772 int status
, void *args
)
1778 /* Make sure we got an empty message. */
1779 ret
= ptrace(PTRACE_GETEVENTMSG
, tracee
, NULL
, &msg
);
1783 /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */
1788 nr
= get_syscall(_metadata
, tracee
);
1790 if (nr
== __NR_getpid
)
1791 change_syscall(_metadata
, tracee
, __NR_getppid
, 0);
1792 if (nr
== __NR_gettid
)
1793 change_syscall(_metadata
, tracee
, -1, 45000);
1794 if (nr
== __NR_openat
)
1795 change_syscall(_metadata
, tracee
, -1, -ESRCH
);
1798 FIXTURE_DATA(TRACE_syscall
) {
1799 struct sock_fprog prog
;
1800 pid_t tracer
, mytid
, mypid
, parent
;
1803 FIXTURE_SETUP(TRACE_syscall
)
1805 struct sock_filter filter
[] = {
1806 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1807 offsetof(struct seccomp_data
, nr
)),
1808 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
1809 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1002),
1810 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_gettid
, 0, 1),
1811 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1003),
1812 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_openat
, 0, 1),
1813 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1004),
1814 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1815 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
| 0x1005),
1816 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1819 memset(&self
->prog
, 0, sizeof(self
->prog
));
1820 self
->prog
.filter
= malloc(sizeof(filter
));
1821 ASSERT_NE(NULL
, self
->prog
.filter
);
1822 memcpy(self
->prog
.filter
, filter
, sizeof(filter
));
1823 self
->prog
.len
= (unsigned short)ARRAY_SIZE(filter
);
1825 /* Prepare some testable syscall results. */
1826 self
->mytid
= syscall(__NR_gettid
);
1827 ASSERT_GT(self
->mytid
, 0);
1828 ASSERT_NE(self
->mytid
, 1) {
1829 TH_LOG("Running this test as init is not supported. :)");
1832 self
->mypid
= getpid();
1833 ASSERT_GT(self
->mypid
, 0);
1834 ASSERT_EQ(self
->mytid
, self
->mypid
);
1836 self
->parent
= getppid();
1837 ASSERT_GT(self
->parent
, 0);
1838 ASSERT_NE(self
->parent
, self
->mypid
);
1840 /* Launch tracer. */
1841 self
->tracer
= setup_trace_fixture(_metadata
, tracer_syscall
, NULL
,
1845 FIXTURE_TEARDOWN(TRACE_syscall
)
1847 teardown_trace_fixture(_metadata
, self
->tracer
);
1848 if (self
->prog
.filter
)
1849 free(self
->prog
.filter
);
1852 TEST_F(TRACE_syscall
, ptrace_syscall_redirected
)
1854 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1855 teardown_trace_fixture(_metadata
, self
->tracer
);
1856 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1859 /* Tracer will redirect getpid to getppid. */
1860 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1863 TEST_F(TRACE_syscall
, ptrace_syscall_errno
)
1865 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1866 teardown_trace_fixture(_metadata
, self
->tracer
);
1867 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1870 /* Tracer should skip the open syscall, resulting in ESRCH. */
1871 EXPECT_SYSCALL_RETURN(-ESRCH
, syscall(__NR_openat
));
1874 TEST_F(TRACE_syscall
, ptrace_syscall_faked
)
1876 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1877 teardown_trace_fixture(_metadata
, self
->tracer
);
1878 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
1881 /* Tracer should skip the gettid syscall, resulting fake pid. */
1882 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid
));
1885 TEST_F(TRACE_syscall
, syscall_allowed
)
1889 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1892 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1895 /* getppid works as expected (no changes). */
1896 EXPECT_EQ(self
->parent
, syscall(__NR_getppid
));
1897 EXPECT_NE(self
->mypid
, syscall(__NR_getppid
));
1900 TEST_F(TRACE_syscall
, syscall_redirected
)
1904 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1907 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1910 /* getpid has been redirected to getppid as expected. */
1911 EXPECT_EQ(self
->parent
, syscall(__NR_getpid
));
1912 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
1915 TEST_F(TRACE_syscall
, syscall_errno
)
1919 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1922 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1925 /* openat has been skipped and an errno return. */
1926 EXPECT_SYSCALL_RETURN(-ESRCH
, syscall(__NR_openat
));
1929 TEST_F(TRACE_syscall
, syscall_faked
)
1933 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1936 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1939 /* gettid has been skipped and an altered return value stored. */
1940 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid
));
1943 TEST_F(TRACE_syscall
, skip_after_RET_TRACE
)
1945 struct sock_filter filter
[] = {
1946 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1947 offsetof(struct seccomp_data
, nr
)),
1948 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1949 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EPERM
),
1950 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1952 struct sock_fprog prog
= {
1953 .len
= (unsigned short)ARRAY_SIZE(filter
),
1958 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1961 /* Install fixture filter. */
1962 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1965 /* Install "errno on getppid" filter. */
1966 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
1969 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
1971 EXPECT_EQ(-1, syscall(__NR_getpid
));
1972 EXPECT_EQ(EPERM
, errno
);
1975 TEST_F_SIGNAL(TRACE_syscall
, kill_after_RET_TRACE
, SIGSYS
)
1977 struct sock_filter filter
[] = {
1978 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
1979 offsetof(struct seccomp_data
, nr
)),
1980 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
1981 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
1982 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
1984 struct sock_fprog prog
= {
1985 .len
= (unsigned short)ARRAY_SIZE(filter
),
1990 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
1993 /* Install fixture filter. */
1994 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &self
->prog
, 0, 0);
1997 /* Install "death on getppid" filter. */
1998 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
2001 /* Tracer will redirect getpid to getppid, and we should die. */
2002 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
2005 TEST_F(TRACE_syscall
, skip_after_ptrace
)
2007 struct sock_filter filter
[] = {
2008 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2009 offsetof(struct seccomp_data
, nr
)),
2010 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
2011 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EPERM
),
2012 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2014 struct sock_fprog prog
= {
2015 .len
= (unsigned short)ARRAY_SIZE(filter
),
2020 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
2021 teardown_trace_fixture(_metadata
, self
->tracer
);
2022 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
2025 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
2028 /* Install "errno on getppid" filter. */
2029 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
2032 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
2033 EXPECT_EQ(-1, syscall(__NR_getpid
));
2034 EXPECT_EQ(EPERM
, errno
);
2037 TEST_F_SIGNAL(TRACE_syscall
, kill_after_ptrace
, SIGSYS
)
2039 struct sock_filter filter
[] = {
2040 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2041 offsetof(struct seccomp_data
, nr
)),
2042 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getppid
, 0, 1),
2043 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2044 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2046 struct sock_fprog prog
= {
2047 .len
= (unsigned short)ARRAY_SIZE(filter
),
2052 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
2053 teardown_trace_fixture(_metadata
, self
->tracer
);
2054 self
->tracer
= setup_trace_fixture(_metadata
, tracer_ptrace
, NULL
,
2057 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
2060 /* Install "death on getppid" filter. */
2061 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
2064 /* Tracer will redirect getpid to getppid, and we should die. */
2065 EXPECT_NE(self
->mypid
, syscall(__NR_getpid
));
2068 TEST(seccomp_syscall
)
2070 struct sock_filter filter
[] = {
2071 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2073 struct sock_fprog prog
= {
2074 .len
= (unsigned short)ARRAY_SIZE(filter
),
2079 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
2081 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2084 /* Reject insane operation. */
2085 ret
= seccomp(-1, 0, &prog
);
2086 ASSERT_NE(ENOSYS
, errno
) {
2087 TH_LOG("Kernel does not support seccomp syscall!");
2089 EXPECT_EQ(EINVAL
, errno
) {
2090 TH_LOG("Did not reject crazy op value!");
2093 /* Reject strict with flags or pointer. */
2094 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, -1, NULL
);
2095 EXPECT_EQ(EINVAL
, errno
) {
2096 TH_LOG("Did not reject mode strict with flags!");
2098 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, 0, &prog
);
2099 EXPECT_EQ(EINVAL
, errno
) {
2100 TH_LOG("Did not reject mode strict with uargs!");
2103 /* Reject insane args for filter. */
2104 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, -1, &prog
);
2105 EXPECT_EQ(EINVAL
, errno
) {
2106 TH_LOG("Did not reject crazy filter flags!");
2108 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, NULL
);
2109 EXPECT_EQ(EFAULT
, errno
) {
2110 TH_LOG("Did not reject NULL filter!");
2113 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
2114 EXPECT_EQ(0, errno
) {
2115 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
2120 TEST(seccomp_syscall_mode_lock
)
2122 struct sock_filter filter
[] = {
2123 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2125 struct sock_fprog prog
= {
2126 .len
= (unsigned short)ARRAY_SIZE(filter
),
2131 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
2133 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2136 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
2137 ASSERT_NE(ENOSYS
, errno
) {
2138 TH_LOG("Kernel does not support seccomp syscall!");
2141 TH_LOG("Could not install filter!");
2144 /* Make sure neither entry point will switch to strict. */
2145 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_STRICT
, 0, 0, 0);
2146 EXPECT_EQ(EINVAL
, errno
) {
2147 TH_LOG("Switched to mode strict!");
2150 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, 0, NULL
);
2151 EXPECT_EQ(EINVAL
, errno
) {
2152 TH_LOG("Switched to mode strict!");
2157 * Test detection of known and unknown filter flags. Userspace needs to be able
2158 * to check if a filter flag is supported by the current kernel and a good way
2159 * of doing that is by attempting to enter filter mode, with the flag bit in
2160 * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
2161 * that the flag is valid and EINVAL indicates that the flag is invalid.
2163 TEST(detect_seccomp_filter_flags
)
2165 unsigned int flags
[] = { SECCOMP_FILTER_FLAG_TSYNC
,
2166 SECCOMP_FILTER_FLAG_LOG
,
2167 SECCOMP_FILTER_FLAG_SPEC_ALLOW
,
2168 SECCOMP_FILTER_FLAG_NEW_LISTENER
};
2169 unsigned int exclusive
[] = {
2170 SECCOMP_FILTER_FLAG_TSYNC
,
2171 SECCOMP_FILTER_FLAG_NEW_LISTENER
};
2172 unsigned int flag
, all_flags
, exclusive_mask
;
2176 /* Test detection of individual known-good filter flags */
2177 for (i
= 0, all_flags
= 0; i
< ARRAY_SIZE(flags
); i
++) {
2181 /* Make sure the flag is a single bit! */
2190 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2191 ASSERT_NE(ENOSYS
, errno
) {
2192 TH_LOG("Kernel does not support seccomp syscall!");
2195 EXPECT_EQ(EFAULT
, errno
) {
2196 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
2204 * Test detection of all known-good filter flags combined. But
2205 * for the exclusive flags we need to mask them out and try them
2206 * individually for the "all flags" testing.
2209 for (i
= 0; i
< ARRAY_SIZE(exclusive
); i
++)
2210 exclusive_mask
|= exclusive
[i
];
2211 for (i
= 0; i
< ARRAY_SIZE(exclusive
); i
++) {
2212 flag
= all_flags
& ~exclusive_mask
;
2213 flag
|= exclusive
[i
];
2215 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2217 EXPECT_EQ(EFAULT
, errno
) {
2218 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
2223 /* Test detection of an unknown filter flags, without exclusives. */
2225 flag
&= ~exclusive_mask
;
2226 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2228 EXPECT_EQ(EINVAL
, errno
) {
2229 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
2234 * Test detection of an unknown filter flag that may simply need to be
2235 * added to this test
2237 flag
= flags
[ARRAY_SIZE(flags
) - 1] << 1;
2238 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, flag
, NULL
);
2240 EXPECT_EQ(EINVAL
, errno
) {
2241 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?",
2248 struct sock_filter filter
[] = {
2249 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2251 struct sock_fprog prog
= {
2252 .len
= (unsigned short)ARRAY_SIZE(filter
),
2257 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, NULL
, 0, 0);
2259 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2262 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2264 ASSERT_NE(ENOSYS
, errno
) {
2265 TH_LOG("Kernel does not support seccomp syscall!");
2268 TH_LOG("Could not install initial filter with TSYNC!");
2272 #define TSYNC_SIBLINGS 2
2273 struct tsync_sibling
{
2277 pthread_cond_t
*cond
;
2278 pthread_mutex_t
*mutex
;
2281 struct sock_fprog
*prog
;
2282 struct __test_metadata
*metadata
;
2286 * To avoid joining joined threads (which is not allowed by Bionic),
2287 * make sure we both successfully join and clear the tid to skip a
2288 * later join attempt during fixture teardown. Any remaining threads
2289 * will be directly killed during teardown.
2291 #define PTHREAD_JOIN(tid, status) \
2293 int _rc = pthread_join(tid, status); \
2295 TH_LOG("pthread_join of tid %u failed: %d\n", \
2296 (unsigned int)tid, _rc); \
2302 FIXTURE_DATA(TSYNC
) {
2303 struct sock_fprog root_prog
, apply_prog
;
2304 struct tsync_sibling sibling
[TSYNC_SIBLINGS
];
2306 pthread_cond_t cond
;
2307 pthread_mutex_t mutex
;
2311 FIXTURE_SETUP(TSYNC
)
2313 struct sock_filter root_filter
[] = {
2314 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2316 struct sock_filter apply_filter
[] = {
2317 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2318 offsetof(struct seccomp_data
, nr
)),
2319 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 0, 1),
2320 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2321 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2324 memset(&self
->root_prog
, 0, sizeof(self
->root_prog
));
2325 memset(&self
->apply_prog
, 0, sizeof(self
->apply_prog
));
2326 memset(&self
->sibling
, 0, sizeof(self
->sibling
));
2327 self
->root_prog
.filter
= malloc(sizeof(root_filter
));
2328 ASSERT_NE(NULL
, self
->root_prog
.filter
);
2329 memcpy(self
->root_prog
.filter
, &root_filter
, sizeof(root_filter
));
2330 self
->root_prog
.len
= (unsigned short)ARRAY_SIZE(root_filter
);
2332 self
->apply_prog
.filter
= malloc(sizeof(apply_filter
));
2333 ASSERT_NE(NULL
, self
->apply_prog
.filter
);
2334 memcpy(self
->apply_prog
.filter
, &apply_filter
, sizeof(apply_filter
));
2335 self
->apply_prog
.len
= (unsigned short)ARRAY_SIZE(apply_filter
);
2337 self
->sibling_count
= 0;
2338 pthread_mutex_init(&self
->mutex
, NULL
);
2339 pthread_cond_init(&self
->cond
, NULL
);
2340 sem_init(&self
->started
, 0, 0);
2341 self
->sibling
[0].tid
= 0;
2342 self
->sibling
[0].cond
= &self
->cond
;
2343 self
->sibling
[0].started
= &self
->started
;
2344 self
->sibling
[0].mutex
= &self
->mutex
;
2345 self
->sibling
[0].diverge
= 0;
2346 self
->sibling
[0].num_waits
= 1;
2347 self
->sibling
[0].prog
= &self
->root_prog
;
2348 self
->sibling
[0].metadata
= _metadata
;
2349 self
->sibling
[1].tid
= 0;
2350 self
->sibling
[1].cond
= &self
->cond
;
2351 self
->sibling
[1].started
= &self
->started
;
2352 self
->sibling
[1].mutex
= &self
->mutex
;
2353 self
->sibling
[1].diverge
= 0;
2354 self
->sibling
[1].prog
= &self
->root_prog
;
2355 self
->sibling
[1].num_waits
= 1;
2356 self
->sibling
[1].metadata
= _metadata
;
2359 FIXTURE_TEARDOWN(TSYNC
)
2363 if (self
->root_prog
.filter
)
2364 free(self
->root_prog
.filter
);
2365 if (self
->apply_prog
.filter
)
2366 free(self
->apply_prog
.filter
);
2368 for ( ; sib
< self
->sibling_count
; ++sib
) {
2369 struct tsync_sibling
*s
= &self
->sibling
[sib
];
2374 * If a thread is still running, it may be stuck, so hit
2375 * it over the head really hard.
2377 pthread_kill(s
->tid
, 9);
2379 pthread_mutex_destroy(&self
->mutex
);
2380 pthread_cond_destroy(&self
->cond
);
2381 sem_destroy(&self
->started
);
2384 void *tsync_sibling(void *data
)
2387 struct tsync_sibling
*me
= data
;
2389 me
->system_tid
= syscall(__NR_gettid
);
2391 pthread_mutex_lock(me
->mutex
);
2393 /* Just re-apply the root prog to fork the tree */
2394 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
,
2397 sem_post(me
->started
);
2398 /* Return outside of started so parent notices failures. */
2400 pthread_mutex_unlock(me
->mutex
);
2401 return (void *)SIBLING_EXIT_FAILURE
;
2404 pthread_cond_wait(me
->cond
, me
->mutex
);
2405 me
->num_waits
= me
->num_waits
- 1;
2406 } while (me
->num_waits
);
2407 pthread_mutex_unlock(me
->mutex
);
2409 ret
= prctl(PR_GET_NO_NEW_PRIVS
, 0, 0, 0, 0);
2411 return (void *)SIBLING_EXIT_NEWPRIVS
;
2413 return (void *)SIBLING_EXIT_UNKILLED
;
2416 void tsync_start_sibling(struct tsync_sibling
*sibling
)
2418 pthread_create(&sibling
->tid
, NULL
, tsync_sibling
, (void *)sibling
);
2421 TEST_F(TSYNC
, siblings_fail_prctl
)
2425 struct sock_filter filter
[] = {
2426 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2427 offsetof(struct seccomp_data
, nr
)),
2428 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_prctl
, 0, 1),
2429 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ERRNO
| EINVAL
),
2430 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2432 struct sock_fprog prog
= {
2433 .len
= (unsigned short)ARRAY_SIZE(filter
),
2437 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2438 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2441 /* Check prctl failure detection by requesting sib 0 diverge. */
2442 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
);
2443 ASSERT_NE(ENOSYS
, errno
) {
2444 TH_LOG("Kernel does not support seccomp syscall!");
2447 TH_LOG("setting filter failed");
2450 self
->sibling
[0].diverge
= 1;
2451 tsync_start_sibling(&self
->sibling
[0]);
2452 tsync_start_sibling(&self
->sibling
[1]);
2454 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2455 sem_wait(&self
->started
);
2456 self
->sibling_count
++;
2459 /* Signal the threads to clean up*/
2460 pthread_mutex_lock(&self
->mutex
);
2461 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2462 TH_LOG("cond broadcast non-zero");
2464 pthread_mutex_unlock(&self
->mutex
);
2466 /* Ensure diverging sibling failed to call prctl. */
2467 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2468 EXPECT_EQ(SIBLING_EXIT_FAILURE
, (long)status
);
2469 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2470 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2473 TEST_F(TSYNC
, two_siblings_with_ancestor
)
2478 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2479 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2482 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2483 ASSERT_NE(ENOSYS
, errno
) {
2484 TH_LOG("Kernel does not support seccomp syscall!");
2487 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2489 tsync_start_sibling(&self
->sibling
[0]);
2490 tsync_start_sibling(&self
->sibling
[1]);
2492 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2493 sem_wait(&self
->started
);
2494 self
->sibling_count
++;
2497 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2500 TH_LOG("Could install filter on all threads!");
2502 /* Tell the siblings to test the policy */
2503 pthread_mutex_lock(&self
->mutex
);
2504 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2505 TH_LOG("cond broadcast non-zero");
2507 pthread_mutex_unlock(&self
->mutex
);
2508 /* Ensure they are both killed and don't exit cleanly. */
2509 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2510 EXPECT_EQ(0x0, (long)status
);
2511 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2512 EXPECT_EQ(0x0, (long)status
);
2515 TEST_F(TSYNC
, two_sibling_want_nnp
)
2519 /* start siblings before any prctl() operations */
2520 tsync_start_sibling(&self
->sibling
[0]);
2521 tsync_start_sibling(&self
->sibling
[1]);
2522 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2523 sem_wait(&self
->started
);
2524 self
->sibling_count
++;
2527 /* Tell the siblings to test no policy */
2528 pthread_mutex_lock(&self
->mutex
);
2529 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2530 TH_LOG("cond broadcast non-zero");
2532 pthread_mutex_unlock(&self
->mutex
);
2534 /* Ensure they are both upset about lacking nnp. */
2535 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2536 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS
, (long)status
);
2537 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2538 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS
, (long)status
);
2541 TEST_F(TSYNC
, two_siblings_with_no_filter
)
2546 /* start siblings before any prctl() operations */
2547 tsync_start_sibling(&self
->sibling
[0]);
2548 tsync_start_sibling(&self
->sibling
[1]);
2549 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2550 sem_wait(&self
->started
);
2551 self
->sibling_count
++;
2554 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2555 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2558 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2560 ASSERT_NE(ENOSYS
, errno
) {
2561 TH_LOG("Kernel does not support seccomp syscall!");
2564 TH_LOG("Could install filter on all threads!");
2567 /* Tell the siblings to test the policy */
2568 pthread_mutex_lock(&self
->mutex
);
2569 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2570 TH_LOG("cond broadcast non-zero");
2572 pthread_mutex_unlock(&self
->mutex
);
2574 /* Ensure they are both killed and don't exit cleanly. */
2575 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2576 EXPECT_EQ(0x0, (long)status
);
2577 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2578 EXPECT_EQ(0x0, (long)status
);
2581 TEST_F(TSYNC
, two_siblings_with_one_divergence
)
2586 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2587 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2590 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2591 ASSERT_NE(ENOSYS
, errno
) {
2592 TH_LOG("Kernel does not support seccomp syscall!");
2595 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2597 self
->sibling
[0].diverge
= 1;
2598 tsync_start_sibling(&self
->sibling
[0]);
2599 tsync_start_sibling(&self
->sibling
[1]);
2601 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2602 sem_wait(&self
->started
);
2603 self
->sibling_count
++;
2606 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2608 ASSERT_EQ(self
->sibling
[0].system_tid
, ret
) {
2609 TH_LOG("Did not fail on diverged sibling.");
2612 /* Wake the threads */
2613 pthread_mutex_lock(&self
->mutex
);
2614 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2615 TH_LOG("cond broadcast non-zero");
2617 pthread_mutex_unlock(&self
->mutex
);
2619 /* Ensure they are both unkilled. */
2620 PTHREAD_JOIN(self
->sibling
[0].tid
, &status
);
2621 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2622 PTHREAD_JOIN(self
->sibling
[1].tid
, &status
);
2623 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2626 TEST_F(TSYNC
, two_siblings_not_under_filter
)
2631 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2632 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2636 * Sibling 0 will have its own seccomp policy
2637 * and Sibling 1 will not be under seccomp at
2638 * all. Sibling 1 will enter seccomp and 0
2639 * will cause failure.
2641 self
->sibling
[0].diverge
= 1;
2642 tsync_start_sibling(&self
->sibling
[0]);
2643 tsync_start_sibling(&self
->sibling
[1]);
2645 while (self
->sibling_count
< TSYNC_SIBLINGS
) {
2646 sem_wait(&self
->started
);
2647 self
->sibling_count
++;
2650 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &self
->root_prog
);
2651 ASSERT_NE(ENOSYS
, errno
) {
2652 TH_LOG("Kernel does not support seccomp syscall!");
2655 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2658 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2660 ASSERT_EQ(ret
, self
->sibling
[0].system_tid
) {
2661 TH_LOG("Did not fail on diverged sibling.");
2664 if (ret
== self
->sibling
[0].system_tid
)
2667 pthread_mutex_lock(&self
->mutex
);
2669 /* Increment the other siblings num_waits so we can clean up
2670 * the one we just saw.
2672 self
->sibling
[!sib
].num_waits
+= 1;
2674 /* Signal the thread to clean up*/
2675 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2676 TH_LOG("cond broadcast non-zero");
2678 pthread_mutex_unlock(&self
->mutex
);
2679 PTHREAD_JOIN(self
->sibling
[sib
].tid
, &status
);
2680 EXPECT_EQ(SIBLING_EXIT_UNKILLED
, (long)status
);
2681 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2682 while (!kill(self
->sibling
[sib
].system_tid
, 0))
2684 /* Switch to the remaining sibling */
2687 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2690 TH_LOG("Expected the remaining sibling to sync");
2693 pthread_mutex_lock(&self
->mutex
);
2695 /* If remaining sibling didn't have a chance to wake up during
2696 * the first broadcast, manually reduce the num_waits now.
2698 if (self
->sibling
[sib
].num_waits
> 1)
2699 self
->sibling
[sib
].num_waits
= 1;
2700 ASSERT_EQ(0, pthread_cond_broadcast(&self
->cond
)) {
2701 TH_LOG("cond broadcast non-zero");
2703 pthread_mutex_unlock(&self
->mutex
);
2704 PTHREAD_JOIN(self
->sibling
[sib
].tid
, &status
);
2705 EXPECT_EQ(0, (long)status
);
2706 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2707 while (!kill(self
->sibling
[sib
].system_tid
, 0))
2710 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_TSYNC
,
2712 ASSERT_EQ(0, ret
); /* just us chickens */
2715 /* Make sure restarted syscalls are seen directly as "restart_syscall". */
2716 TEST(syscall_restart
)
2723 siginfo_t info
= { };
2724 struct sock_filter filter
[] = {
2725 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2726 offsetof(struct seccomp_data
, nr
)),
2728 #ifdef __NR_sigreturn
2729 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_sigreturn
, 6, 0),
2731 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_read
, 5, 0),
2732 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_exit
, 4, 0),
2733 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_rt_sigreturn
, 3, 0),
2734 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_nanosleep
, 4, 0),
2735 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_restart_syscall
, 4, 0),
2737 /* Allow __NR_write for easy logging. */
2738 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_write
, 0, 1),
2739 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2740 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2741 /* The nanosleep jump target. */
2742 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
|0x100),
2743 /* The restart_syscall jump target. */
2744 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_TRACE
|0x200),
2746 struct sock_fprog prog
= {
2747 .len
= (unsigned short)ARRAY_SIZE(filter
),
2750 #if defined(__arm__)
2751 struct utsname utsbuf
;
2754 ASSERT_EQ(0, pipe(pipefd
));
2757 ASSERT_LE(0, child_pid
);
2758 if (child_pid
== 0) {
2759 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2761 struct timespec timeout
= { };
2763 /* Attach parent as tracer and stop. */
2764 EXPECT_EQ(0, ptrace(PTRACE_TRACEME
));
2765 EXPECT_EQ(0, raise(SIGSTOP
));
2767 EXPECT_EQ(0, close(pipefd
[1]));
2769 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0)) {
2770 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2773 ret
= prctl(PR_SET_SECCOMP
, SECCOMP_MODE_FILTER
, &prog
, 0, 0);
2775 TH_LOG("Failed to install filter!");
2778 EXPECT_EQ(1, read(pipefd
[0], &buf
, 1)) {
2779 TH_LOG("Failed to read() sync from parent");
2781 EXPECT_EQ('.', buf
) {
2782 TH_LOG("Failed to get sync data from read()");
2785 /* Start nanosleep to be interrupted. */
2788 EXPECT_EQ(0, nanosleep(&timeout
, NULL
)) {
2789 TH_LOG("Call to nanosleep() failed (errno %d)", errno
);
2792 /* Read final sync from parent. */
2793 EXPECT_EQ(1, read(pipefd
[0], &buf
, 1)) {
2794 TH_LOG("Failed final read() from parent");
2796 EXPECT_EQ('!', buf
) {
2797 TH_LOG("Failed to get final data from read()");
2800 /* Directly report the status of our test harness results. */
2801 syscall(__NR_exit
, _metadata
->passed
? EXIT_SUCCESS
2804 EXPECT_EQ(0, close(pipefd
[0]));
2806 /* Attach to child, setup options, and release. */
2807 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2808 ASSERT_EQ(true, WIFSTOPPED(status
));
2809 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS
, child_pid
, NULL
,
2810 PTRACE_O_TRACESECCOMP
));
2811 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2812 ASSERT_EQ(1, write(pipefd
[1], ".", 1));
2814 /* Wait for nanosleep() to start. */
2815 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2816 ASSERT_EQ(true, WIFSTOPPED(status
));
2817 ASSERT_EQ(SIGTRAP
, WSTOPSIG(status
));
2818 ASSERT_EQ(PTRACE_EVENT_SECCOMP
, (status
>> 16));
2819 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG
, child_pid
, NULL
, &msg
));
2820 ASSERT_EQ(0x100, msg
);
2821 EXPECT_EQ(__NR_nanosleep
, get_syscall(_metadata
, child_pid
));
2823 /* Might as well check siginfo for sanity while we're here. */
2824 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO
, child_pid
, NULL
, &info
));
2825 ASSERT_EQ(SIGTRAP
, info
.si_signo
);
2826 ASSERT_EQ(SIGTRAP
| (PTRACE_EVENT_SECCOMP
<< 8), info
.si_code
);
2827 EXPECT_EQ(0, info
.si_errno
);
2828 EXPECT_EQ(getuid(), info
.si_uid
);
2829 /* Verify signal delivery came from child (seccomp-triggered). */
2830 EXPECT_EQ(child_pid
, info
.si_pid
);
2832 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
2833 ASSERT_EQ(0, kill(child_pid
, SIGSTOP
));
2834 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2835 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2836 ASSERT_EQ(true, WIFSTOPPED(status
));
2837 ASSERT_EQ(SIGSTOP
, WSTOPSIG(status
));
2838 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO
, child_pid
, NULL
, &info
));
2840 * There is no siginfo on SIGSTOP any more, so we can't verify
2841 * signal delivery came from parent now (getpid() == info.si_pid).
2842 * https://lkml.kernel.org/r/CAGXu5jJaZAOzP1qFz66tYrtbuywqb+UN2SOA1VLHpCCOiYvYeg@mail.gmail.com
2843 * At least verify the SIGSTOP via PTRACE_GETSIGINFO.
2845 EXPECT_EQ(SIGSTOP
, info
.si_signo
);
2847 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
2848 ASSERT_EQ(0, kill(child_pid
, SIGCONT
));
2849 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2850 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2851 ASSERT_EQ(true, WIFSTOPPED(status
));
2852 ASSERT_EQ(SIGCONT
, WSTOPSIG(status
));
2853 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2855 /* Wait for restart_syscall() to start. */
2856 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2857 ASSERT_EQ(true, WIFSTOPPED(status
));
2858 ASSERT_EQ(SIGTRAP
, WSTOPSIG(status
));
2859 ASSERT_EQ(PTRACE_EVENT_SECCOMP
, (status
>> 16));
2860 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG
, child_pid
, NULL
, &msg
));
2862 ASSERT_EQ(0x200, msg
);
2863 ret
= get_syscall(_metadata
, child_pid
);
2864 #if defined(__arm__)
2867 * - native ARM registers do NOT expose true syscall.
2868 * - compat ARM registers on ARM64 DO expose true syscall.
2870 ASSERT_EQ(0, uname(&utsbuf
));
2871 if (strncmp(utsbuf
.machine
, "arm", 3) == 0) {
2872 EXPECT_EQ(__NR_nanosleep
, ret
);
2876 EXPECT_EQ(__NR_restart_syscall
, ret
);
2879 /* Write again to end test. */
2880 ASSERT_EQ(0, ptrace(PTRACE_CONT
, child_pid
, NULL
, 0));
2881 ASSERT_EQ(1, write(pipefd
[1], "!", 1));
2882 EXPECT_EQ(0, close(pipefd
[1]));
2884 ASSERT_EQ(child_pid
, waitpid(child_pid
, &status
, 0));
2885 if (WIFSIGNALED(status
) || WEXITSTATUS(status
))
2886 _metadata
->passed
= 0;
2889 TEST_SIGNAL(filter_flag_log
, SIGSYS
)
2891 struct sock_filter allow_filter
[] = {
2892 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2894 struct sock_filter kill_filter
[] = {
2895 BPF_STMT(BPF_LD
|BPF_W
|BPF_ABS
,
2896 offsetof(struct seccomp_data
, nr
)),
2897 BPF_JUMP(BPF_JMP
|BPF_JEQ
|BPF_K
, __NR_getpid
, 0, 1),
2898 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_KILL
),
2899 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
2901 struct sock_fprog allow_prog
= {
2902 .len
= (unsigned short)ARRAY_SIZE(allow_filter
),
2903 .filter
= allow_filter
,
2905 struct sock_fprog kill_prog
= {
2906 .len
= (unsigned short)ARRAY_SIZE(kill_filter
),
2907 .filter
= kill_filter
,
2910 pid_t parent
= getppid();
2912 ret
= prctl(PR_SET_NO_NEW_PRIVS
, 1, 0, 0, 0);
2915 /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */
2916 ret
= seccomp(SECCOMP_SET_MODE_STRICT
, SECCOMP_FILTER_FLAG_LOG
,
2918 ASSERT_NE(ENOSYS
, errno
) {
2919 TH_LOG("Kernel does not support seccomp syscall!");
2922 TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
2924 EXPECT_EQ(EINVAL
, errno
) {
2925 TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
2928 /* Verify that a simple, permissive filter can be added with no flags */
2929 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, 0, &allow_prog
);
2932 /* See if the same filter can be added with the FILTER_FLAG_LOG flag */
2933 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_LOG
,
2935 ASSERT_NE(EINVAL
, errno
) {
2936 TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
2940 /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */
2941 ret
= seccomp(SECCOMP_SET_MODE_FILTER
, SECCOMP_FILTER_FLAG_LOG
,
2945 EXPECT_EQ(parent
, syscall(__NR_getppid
));
2946 /* getpid() should never return. */
2947 EXPECT_EQ(0, syscall(__NR_getpid
));
2950 TEST(get_action_avail
)
2952 __u32 actions
[] = { SECCOMP_RET_KILL_THREAD
, SECCOMP_RET_TRAP
,
2953 SECCOMP_RET_ERRNO
, SECCOMP_RET_TRACE
,
2954 SECCOMP_RET_LOG
, SECCOMP_RET_ALLOW
};
2955 __u32 unknown_action
= 0x10000000U
;
2959 ret
= seccomp(SECCOMP_GET_ACTION_AVAIL
, 0, &actions
[0]);
2960 ASSERT_NE(ENOSYS
, errno
) {
2961 TH_LOG("Kernel does not support seccomp syscall!");
2963 ASSERT_NE(EINVAL
, errno
) {
2964 TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
2968 for (i
= 0; i
< ARRAY_SIZE(actions
); i
++) {
2969 ret
= seccomp(SECCOMP_GET_ACTION_AVAIL
, 0, &actions
[i
]);
2971 TH_LOG("Expected action (0x%X) not available!",
2976 /* Check that an unknown action is handled properly (EOPNOTSUPP) */
2977 ret
= seccomp(SECCOMP_GET_ACTION_AVAIL
, 0, &unknown_action
);
2979 EXPECT_EQ(errno
, EOPNOTSUPP
);
2987 struct seccomp_metadata md
;
2990 /* Only real root can get metadata. */
2992 XFAIL(return, "get_metadata requires real root");
2996 ASSERT_EQ(0, pipe(pipefd
));
3001 struct sock_filter filter
[] = {
3002 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
3004 struct sock_fprog prog
= {
3005 .len
= (unsigned short)ARRAY_SIZE(filter
),
3009 /* one with log, one without */
3010 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER
,
3011 SECCOMP_FILTER_FLAG_LOG
, &prog
));
3012 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
));
3014 ASSERT_EQ(0, close(pipefd
[0]));
3015 ASSERT_EQ(1, write(pipefd
[1], "1", 1));
3016 ASSERT_EQ(0, close(pipefd
[1]));
3022 ASSERT_EQ(0, close(pipefd
[1]));
3023 ASSERT_EQ(1, read(pipefd
[0], &buf
, 1));
3025 ASSERT_EQ(0, ptrace(PTRACE_ATTACH
, pid
));
3026 ASSERT_EQ(pid
, waitpid(pid
, NULL
, 0));
3028 /* Past here must not use ASSERT or child process is never killed. */
3032 ret
= ptrace(PTRACE_SECCOMP_GET_METADATA
, pid
, sizeof(md
), &md
);
3033 EXPECT_EQ(sizeof(md
), ret
) {
3034 if (errno
== EINVAL
)
3035 XFAIL(goto skip
, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
3038 EXPECT_EQ(md
.flags
, SECCOMP_FILTER_FLAG_LOG
);
3039 EXPECT_EQ(md
.filter_off
, 0);
3042 ret
= ptrace(PTRACE_SECCOMP_GET_METADATA
, pid
, sizeof(md
), &md
);
3043 EXPECT_EQ(sizeof(md
), ret
);
3044 EXPECT_EQ(md
.flags
, 0);
3045 EXPECT_EQ(md
.filter_off
, 1);
3048 ASSERT_EQ(0, kill(pid
, SIGKILL
));
3051 static int user_trap_syscall(int nr
, unsigned int flags
)
3053 struct sock_filter filter
[] = {
3054 BPF_STMT(BPF_LD
+BPF_W
+BPF_ABS
,
3055 offsetof(struct seccomp_data
, nr
)),
3056 BPF_JUMP(BPF_JMP
+BPF_JEQ
+BPF_K
, nr
, 0, 1),
3057 BPF_STMT(BPF_RET
+BPF_K
, SECCOMP_RET_USER_NOTIF
),
3058 BPF_STMT(BPF_RET
+BPF_K
, SECCOMP_RET_ALLOW
),
3061 struct sock_fprog prog
= {
3062 .len
= (unsigned short)ARRAY_SIZE(filter
),
3066 return seccomp(SECCOMP_SET_MODE_FILTER
, flags
, &prog
);
3069 #define USER_NOTIF_MAGIC 116983961184613L
3070 TEST(user_notification_basic
)
3074 int status
, listener
;
3075 struct seccomp_notif req
= {};
3076 struct seccomp_notif_resp resp
= {};
3077 struct pollfd pollfd
;
3079 struct sock_filter filter
[] = {
3080 BPF_STMT(BPF_RET
|BPF_K
, SECCOMP_RET_ALLOW
),
3082 struct sock_fprog prog
= {
3083 .len
= (unsigned short)ARRAY_SIZE(filter
),
3090 /* Check that we get -ENOSYS with no listener attached */
3092 if (user_trap_syscall(__NR_getppid
, 0) < 0)
3094 ret
= syscall(__NR_getppid
);
3095 exit(ret
>= 0 || errno
!= ENOSYS
);
3098 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3099 EXPECT_EQ(true, WIFEXITED(status
));
3100 EXPECT_EQ(0, WEXITSTATUS(status
));
3102 /* Add some no-op filters so for grins. */
3103 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
), 0);
3104 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
), 0);
3105 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
), 0);
3106 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER
, 0, &prog
), 0);
3108 /* Check that the basic notification machinery works */
3109 listener
= user_trap_syscall(__NR_getppid
,
3110 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3111 ASSERT_GE(listener
, 0);
3113 /* Installing a second listener in the chain should EBUSY */
3114 EXPECT_EQ(user_trap_syscall(__NR_getppid
,
3115 SECCOMP_FILTER_FLAG_NEW_LISTENER
),
3117 EXPECT_EQ(errno
, EBUSY
);
3123 ret
= syscall(__NR_getppid
);
3124 exit(ret
!= USER_NOTIF_MAGIC
);
3127 pollfd
.fd
= listener
;
3128 pollfd
.events
= POLLIN
| POLLOUT
;
3130 EXPECT_GT(poll(&pollfd
, 1, -1), 0);
3131 EXPECT_EQ(pollfd
.revents
, POLLIN
);
3133 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3135 pollfd
.fd
= listener
;
3136 pollfd
.events
= POLLIN
| POLLOUT
;
3138 EXPECT_GT(poll(&pollfd
, 1, -1), 0);
3139 EXPECT_EQ(pollfd
.revents
, POLLOUT
);
3141 EXPECT_EQ(req
.data
.nr
, __NR_getppid
);
3145 resp
.val
= USER_NOTIF_MAGIC
;
3147 /* check that we make sure flags == 0 */
3149 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), -1);
3150 EXPECT_EQ(errno
, EINVAL
);
3153 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), 0);
3155 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3156 EXPECT_EQ(true, WIFEXITED(status
));
3157 EXPECT_EQ(0, WEXITSTATUS(status
));
3160 TEST(user_notification_kill_in_middle
)
3165 struct seccomp_notif req
= {};
3166 struct seccomp_notif_resp resp
= {};
3168 listener
= user_trap_syscall(__NR_getppid
,
3169 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3170 ASSERT_GE(listener
, 0);
3173 * Check that nothing bad happens when we kill the task in the middle
3180 ret
= syscall(__NR_getppid
);
3181 exit(ret
!= USER_NOTIF_MAGIC
);
3184 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3185 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_ID_VALID
, &req
.id
), 0);
3187 EXPECT_EQ(kill(pid
, SIGKILL
), 0);
3188 EXPECT_EQ(waitpid(pid
, NULL
, 0), pid
);
3190 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_ID_VALID
, &req
.id
), -1);
3193 ret
= ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
);
3195 EXPECT_EQ(errno
, ENOENT
);
3198 static int handled
= -1;
3200 static void signal_handler(int signal
)
3202 if (write(handled
, "c", 1) != 1)
3203 perror("write from signal");
3206 TEST(user_notification_signal
)
3210 int status
, listener
, sk_pair
[2];
3211 struct seccomp_notif req
= {};
3212 struct seccomp_notif_resp resp
= {};
3215 ASSERT_EQ(socketpair(PF_LOCAL
, SOCK_SEQPACKET
, 0, sk_pair
), 0);
3217 listener
= user_trap_syscall(__NR_gettid
,
3218 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3219 ASSERT_GE(listener
, 0);
3226 handled
= sk_pair
[1];
3227 if (signal(SIGUSR1
, signal_handler
) == SIG_ERR
) {
3232 * ERESTARTSYS behavior is a bit hard to test, because we need
3233 * to rely on a signal that has not yet been handled. Let's at
3234 * least check that the error code gets propagated through, and
3235 * hope that it doesn't break when there is actually a signal :)
3237 ret
= syscall(__NR_gettid
);
3238 exit(!(ret
== -1 && errno
== 512));
3243 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3245 EXPECT_EQ(kill(pid
, SIGUSR1
), 0);
3248 * Make sure the signal really is delivered, which means we're not
3249 * stuck in the user notification code any more and the notification
3252 EXPECT_EQ(read(sk_pair
[0], &c
, 1), 1);
3255 resp
.error
= -EPERM
;
3258 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), -1);
3259 EXPECT_EQ(errno
, ENOENT
);
3261 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3264 resp
.error
= -512; /* -ERESTARTSYS */
3267 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), 0);
3269 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3270 EXPECT_EQ(true, WIFEXITED(status
));
3271 EXPECT_EQ(0, WEXITSTATUS(status
));
3274 TEST(user_notification_closed_listener
)
3278 int status
, listener
;
3280 listener
= user_trap_syscall(__NR_getppid
,
3281 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3282 ASSERT_GE(listener
, 0);
3285 * Check that we get an ENOSYS when the listener is closed.
3291 ret
= syscall(__NR_getppid
);
3292 exit(ret
!= -1 && errno
!= ENOSYS
);
3297 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3298 EXPECT_EQ(true, WIFEXITED(status
));
3299 EXPECT_EQ(0, WEXITSTATUS(status
));
3303 * Check that a pid in a child namespace still shows up as valid in ours.
3305 TEST(user_notification_child_pid_ns
)
3308 int status
, listener
;
3309 struct seccomp_notif req
= {};
3310 struct seccomp_notif_resp resp
= {};
3312 ASSERT_EQ(unshare(CLONE_NEWPID
), 0);
3314 listener
= user_trap_syscall(__NR_getppid
,
3315 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3316 ASSERT_GE(listener
, 0);
3322 exit(syscall(__NR_getppid
) != USER_NOTIF_MAGIC
);
3324 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3325 EXPECT_EQ(req
.pid
, pid
);
3329 resp
.val
= USER_NOTIF_MAGIC
;
3331 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), 0);
3333 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3334 EXPECT_EQ(true, WIFEXITED(status
));
3335 EXPECT_EQ(0, WEXITSTATUS(status
));
3340 * Check that a pid in a sibling (i.e. unrelated) namespace shows up as 0, i.e.
3343 TEST(user_notification_sibling_pid_ns
)
3346 int status
, listener
;
3347 struct seccomp_notif req
= {};
3348 struct seccomp_notif_resp resp
= {};
3350 listener
= user_trap_syscall(__NR_getppid
,
3351 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3352 ASSERT_GE(listener
, 0);
3358 ASSERT_EQ(unshare(CLONE_NEWPID
), 0);
3364 exit(syscall(__NR_getppid
) != USER_NOTIF_MAGIC
);
3366 EXPECT_EQ(waitpid(pid2
, &status
, 0), pid2
);
3367 EXPECT_EQ(true, WIFEXITED(status
));
3368 EXPECT_EQ(0, WEXITSTATUS(status
));
3369 exit(WEXITSTATUS(status
));
3372 /* Create the sibling ns, and sibling in it. */
3373 ASSERT_EQ(unshare(CLONE_NEWPID
), 0);
3374 ASSERT_EQ(errno
, 0);
3380 ASSERT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3382 * The pid should be 0, i.e. the task is in some namespace that
3385 EXPECT_EQ(req
.pid
, 0);
3389 resp
.val
= USER_NOTIF_MAGIC
;
3391 ASSERT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), 0);
3397 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3398 EXPECT_EQ(true, WIFEXITED(status
));
3399 EXPECT_EQ(0, WEXITSTATUS(status
));
3401 EXPECT_EQ(waitpid(pid2
, &status
, 0), pid2
);
3402 EXPECT_EQ(true, WIFEXITED(status
));
3403 EXPECT_EQ(0, WEXITSTATUS(status
));
3406 TEST(user_notification_fault_recv
)
3409 int status
, listener
;
3410 struct seccomp_notif req
= {};
3411 struct seccomp_notif_resp resp
= {};
3413 listener
= user_trap_syscall(__NR_getppid
,
3414 SECCOMP_FILTER_FLAG_NEW_LISTENER
);
3415 ASSERT_GE(listener
, 0);
3421 exit(syscall(__NR_getppid
) != USER_NOTIF_MAGIC
);
3423 /* Do a bad recv() */
3424 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, NULL
), -1);
3425 EXPECT_EQ(errno
, EFAULT
);
3427 /* We should still be able to receive this notification, though. */
3428 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_RECV
, &req
), 0);
3429 EXPECT_EQ(req
.pid
, pid
);
3433 resp
.val
= USER_NOTIF_MAGIC
;
3435 EXPECT_EQ(ioctl(listener
, SECCOMP_IOCTL_NOTIF_SEND
, &resp
), 0);
3437 EXPECT_EQ(waitpid(pid
, &status
, 0), pid
);
3438 EXPECT_EQ(true, WIFEXITED(status
));
3439 EXPECT_EQ(0, WEXITSTATUS(status
));
3442 TEST(seccomp_get_notif_sizes
)
3444 struct seccomp_notif_sizes sizes
;
3446 ASSERT_EQ(seccomp(SECCOMP_GET_NOTIF_SIZES
, 0, &sizes
), 0);
3447 EXPECT_EQ(sizes
.seccomp_notif
, sizeof(struct seccomp_notif
));
3448 EXPECT_EQ(sizes
.seccomp_notif_resp
, sizeof(struct seccomp_notif_resp
));
3453 * - add microbenchmarks
3454 * - expand NNP testing
3455 * - better arch-specific TRACE and TRAP handlers.
3456 * - endianness checking when appropriate
3457 * - 64-bit arg prodding
3458 * - arch value testing (x86 modes especially)
3459 * - verify that FILTER_FLAG_LOG filters generate log messages
3460 * - verify that RET_LOG generates log messages