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Merge tag 'riscv-for-linus-5.7-rc4' of git://git.kernel.org/pub/scm/linux/kernel...
[thirdparty/linux.git] / tools / testing / selftests / seccomp / seccomp_bpf.c
CommitLineData
e500db3f 1// SPDX-License-Identifier: GPL-2.0-only
c99ee51a
KC		 2/*
3 * Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
c99ee51a
KC		 4 *
5 * Test code for seccomp bpf.
6 */
7
6a21cc50 8#define _GNU_SOURCE
0ce105bf 9#include <sys/types.h>
10859f38
KC		 10
11/*
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
14 * into accepting it.
15 */
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
21#endif
c99ee51a
KC		 22
23#include <errno.h>
24#include <linux/filter.h>
25#include <sys/prctl.h>
26#include <sys/ptrace.h>
27#include <sys/user.h>
28#include <linux/prctl.h>
29#include <linux/ptrace.h>
30#include <linux/seccomp.h>
c99ee51a
KC		 31#include <pthread.h>
32#include <semaphore.h>
33#include <signal.h>
34#include <stddef.h>
35#include <stdbool.h>
36#include <string.h>
256d0afb 37#include <time.h>
223e660b 38#include <limits.h>
c99ee51a
KC		 39#include <linux/elf.h>
40#include <sys/uio.h>
256d0afb 41#include <sys/utsname.h>
fd88d16c
RS		 42#include <sys/fcntl.h>
43#include <sys/mman.h>
44#include <sys/times.h>
6a21cc50
TA		 45#include <sys/socket.h>
46#include <sys/ioctl.h>
0eebfed2 47#include <linux/kcmp.h>
c99ee51a 48
c99ee51a
KC		 49#include <unistd.h>
50#include <sys/syscall.h>
6a21cc50 51#include <poll.h>
c99ee51a 52
0b40808a 53#include "../kselftest_harness.h"
c99ee51a
KC		 54
55#ifndef PR_SET_PTRACER
56# define PR_SET_PTRACER 0x59616d61
57#endif
58
59#ifndef PR_SET_NO_NEW_PRIVS
60#define PR_SET_NO_NEW_PRIVS 38
61#define PR_GET_NO_NEW_PRIVS 39
62#endif
63
64#ifndef PR_SECCOMP_EXT
65#define PR_SECCOMP_EXT 43
66#endif
67
68#ifndef SECCOMP_EXT_ACT
69#define SECCOMP_EXT_ACT 1
70#endif
71
72#ifndef SECCOMP_EXT_ACT_TSYNC
73#define SECCOMP_EXT_ACT_TSYNC 1
74#endif
75
76#ifndef SECCOMP_MODE_STRICT
77#define SECCOMP_MODE_STRICT 1
78#endif
79
80#ifndef SECCOMP_MODE_FILTER
81#define SECCOMP_MODE_FILTER 2
82#endif
83
f3e1821d 84#ifndef SECCOMP_RET_ALLOW
c99ee51a
KC		 85struct seccomp_data {
86 int nr;
87 __u32 arch;
88 __u64 instruction_pointer;
89 __u64 args[6];
90};
91#endif
92
f3e1821d
KC		 93#ifndef SECCOMP_RET_KILL_PROCESS
94#define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */
fd76875c
KC		 95#define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */
96#endif
c99ee51a 97#ifndef SECCOMP_RET_KILL
fd76875c
KC		 98#define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD
99#define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */
100#define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */
101#define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */
102#define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */
59f5cf44
TH		 103#endif
104#ifndef SECCOMP_RET_LOG
fd76875c 105#define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */
59f5cf44 106#endif
c99ee51a 107
f3e1821d
KC		 108#ifndef __NR_seccomp
109# if defined(__i386__)
110# define __NR_seccomp 354
111# elif defined(__x86_64__)
112# define __NR_seccomp 317
113# elif defined(__arm__)
114# define __NR_seccomp 383
115# elif defined(__aarch64__)
116# define __NR_seccomp 277
5340627e
DA		 117# elif defined(__riscv)
118# define __NR_seccomp 277
f3e1821d
KC		 119# elif defined(__hppa__)
120# define __NR_seccomp 338
121# elif defined(__powerpc__)
122# define __NR_seccomp 358
123# elif defined(__s390__)
124# define __NR_seccomp 348
125# else
126# warning "seccomp syscall number unknown for this architecture"
127# define __NR_seccomp 0xffff
128# endif
129#endif
c99ee51a 130
f3e1821d
KC		 131#ifndef SECCOMP_SET_MODE_STRICT
132#define SECCOMP_SET_MODE_STRICT 0
133#endif
134
135#ifndef SECCOMP_SET_MODE_FILTER
136#define SECCOMP_SET_MODE_FILTER 1
137#endif
138
139#ifndef SECCOMP_GET_ACTION_AVAIL
140#define SECCOMP_GET_ACTION_AVAIL 2
141#endif
142
6a21cc50
TA		 143#ifndef SECCOMP_GET_NOTIF_SIZES
144#define SECCOMP_GET_NOTIF_SIZES 3
145#endif
146
f3e1821d 147#ifndef SECCOMP_FILTER_FLAG_TSYNC
00a02d0c 148#define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0)
f3e1821d
KC		 149#endif
150
151#ifndef SECCOMP_FILTER_FLAG_LOG
00a02d0c
KC		 152#define SECCOMP_FILTER_FLAG_LOG (1UL << 1)
153#endif
154
155#ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW
156#define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2)
f3e1821d
KC		 157#endif
158
d057dc4e
TA		 159#ifndef PTRACE_SECCOMP_GET_METADATA
160#define PTRACE_SECCOMP_GET_METADATA 0x420d
161
162struct seccomp_metadata {
163 __u64 filter_off; /* Input: which filter */
164 __u64 flags; /* Output: filter's flags */
165};
166#endif
167
6a21cc50
TA		 168#ifndef SECCOMP_FILTER_FLAG_NEW_LISTENER
169#define SECCOMP_FILTER_FLAG_NEW_LISTENER (1UL << 3)
170
171#define SECCOMP_RET_USER_NOTIF 0x7fc00000U
172
173#define SECCOMP_IOC_MAGIC '!'
174#define SECCOMP_IO(nr) _IO(SECCOMP_IOC_MAGIC, nr)
175#define SECCOMP_IOR(nr, type) _IOR(SECCOMP_IOC_MAGIC, nr, type)
176#define SECCOMP_IOW(nr, type) _IOW(SECCOMP_IOC_MAGIC, nr, type)
177#define SECCOMP_IOWR(nr, type) _IOWR(SECCOMP_IOC_MAGIC, nr, type)
178
179/* Flags for seccomp notification fd ioctl. */
180#define SECCOMP_IOCTL_NOTIF_RECV SECCOMP_IOWR(0, struct seccomp_notif)
181#define SECCOMP_IOCTL_NOTIF_SEND SECCOMP_IOWR(1, \
182 struct seccomp_notif_resp)
183#define SECCOMP_IOCTL_NOTIF_ID_VALID SECCOMP_IOR(2, __u64)
184
185struct seccomp_notif {
186 __u64 id;
187 __u32 pid;
188 __u32 flags;
189 struct seccomp_data data;
190};
191
192struct seccomp_notif_resp {
193 __u64 id;
194 __s64 val;
195 __s32 error;
196 __u32 flags;
197};
198
199struct seccomp_notif_sizes {
200 __u16 seccomp_notif;
201 __u16 seccomp_notif_resp;
202 __u16 seccomp_data;
203};
204#endif
205
88282297
TA		 206#ifndef PTRACE_EVENTMSG_SYSCALL_ENTRY
207#define PTRACE_EVENTMSG_SYSCALL_ENTRY 1
208#define PTRACE_EVENTMSG_SYSCALL_EXIT 2
209#endif
210
2aa8d8d0
CB		 211#ifndef SECCOMP_USER_NOTIF_FLAG_CONTINUE
212#define SECCOMP_USER_NOTIF_FLAG_CONTINUE 0x00000001
213#endif
214
51891498
TA		 215#ifndef SECCOMP_FILTER_FLAG_TSYNC_ESRCH
216#define SECCOMP_FILTER_FLAG_TSYNC_ESRCH (1UL << 4)
217#endif
218
f3e1821d
KC		 219#ifndef seccomp
220int seccomp(unsigned int op, unsigned int flags, void *args)
221{
222 errno = 0;
223 return syscall(__NR_seccomp, op, flags, args);
224}
c99ee51a
KC		 225#endif
226
c385d0db 227#if __BYTE_ORDER == __LITTLE_ENDIAN
c99ee51a 228#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]))
c385d0db
ME		 229#elif __BYTE_ORDER == __BIG_ENDIAN
230#define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32))
231#else
232#error "wut? Unknown __BYTE_ORDER?!"
233#endif
c99ee51a
KC		 234
235#define SIBLING_EXIT_UNKILLED 0xbadbeef
236#define SIBLING_EXIT_FAILURE 0xbadface
237#define SIBLING_EXIT_NEWPRIVS 0xbadfeed
238
239TEST(mode_strict_support)
240{
241 long ret;
242
243 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
244 ASSERT_EQ(0, ret) {
245 TH_LOG("Kernel does not support CONFIG_SECCOMP");
246 }
369130b6 247 syscall(__NR_exit, 0);
c99ee51a
KC		 248}
249
250TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL)
251{
252 long ret;
253
254 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL);
255 ASSERT_EQ(0, ret) {
256 TH_LOG("Kernel does not support CONFIG_SECCOMP");
257 }
258 syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
259 NULL, NULL, NULL);
260 EXPECT_FALSE(true) {
261 TH_LOG("Unreachable!");
262 }
263}
264
265/* Note! This doesn't test no new privs behavior */
266TEST(no_new_privs_support)
267{
268 long ret;
269
270 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
271 EXPECT_EQ(0, ret) {
272 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
273 }
274}
275
f3f6e306 276/* Tests kernel support by checking for a copy_from_user() fault on NULL. */
c99ee51a
KC		 277TEST(mode_filter_support)
278{
279 long ret;
280
281 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
282 ASSERT_EQ(0, ret) {
283 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
284 }
285 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL);
286 EXPECT_EQ(-1, ret);
287 EXPECT_EQ(EFAULT, errno) {
288 TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!");
289 }
290}
291
292TEST(mode_filter_without_nnp)
293{
294 struct sock_filter filter[] = {
295 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
296 };
297 struct sock_fprog prog = {
298 .len = (unsigned short)ARRAY_SIZE(filter),
299 .filter = filter,
300 };
301 long ret;
302
303 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0);
304 ASSERT_LE(0, ret) {
305 TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS");
306 }
307 errno = 0;
308 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
309 /* Succeeds with CAP_SYS_ADMIN, fails without */
310 /* TODO(wad) check caps not euid */
311 if (geteuid()) {
312 EXPECT_EQ(-1, ret);
313 EXPECT_EQ(EACCES, errno);
314 } else {
315 EXPECT_EQ(0, ret);
316 }
317}
318
319#define MAX_INSNS_PER_PATH 32768
320
321TEST(filter_size_limits)
322{
323 int i;
324 int count = BPF_MAXINSNS + 1;
325 struct sock_filter allow[] = {
326 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
327 };
328 struct sock_filter *filter;
329 struct sock_fprog prog = { };
330 long ret;
331
332 filter = calloc(count, sizeof(*filter));
333 ASSERT_NE(NULL, filter);
334
335 for (i = 0; i < count; i++)
336 filter[i] = allow[0];
337
338 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
339 ASSERT_EQ(0, ret);
340
341 prog.filter = filter;
342 prog.len = count;
343
344 /* Too many filter instructions in a single filter. */
345 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
346 ASSERT_NE(0, ret) {
347 TH_LOG("Installing %d insn filter was allowed", prog.len);
348 }
349
350 /* One less is okay, though. */
351 prog.len -= 1;
352 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
353 ASSERT_EQ(0, ret) {
354 TH_LOG("Installing %d insn filter wasn't allowed", prog.len);
355 }
356}
357
358TEST(filter_chain_limits)
359{
360 int i;
361 int count = BPF_MAXINSNS;
362 struct sock_filter allow[] = {
363 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
364 };
365 struct sock_filter *filter;
366 struct sock_fprog prog = { };
367 long ret;
368
369 filter = calloc(count, sizeof(*filter));
370 ASSERT_NE(NULL, filter);
371
372 for (i = 0; i < count; i++)
373 filter[i] = allow[0];
374
375 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
376 ASSERT_EQ(0, ret);
377
378 prog.filter = filter;
379 prog.len = 1;
380
381 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
382 ASSERT_EQ(0, ret);
383
384 prog.len = count;
385
386 /* Too many total filter instructions. */
387 for (i = 0; i < MAX_INSNS_PER_PATH; i++) {
388 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
389 if (ret != 0)
390 break;
391 }
392 ASSERT_NE(0, ret) {
393 TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)",
394 i, count, i * (count + 4));
395 }
396}
397
398TEST(mode_filter_cannot_move_to_strict)
399{
400 struct sock_filter filter[] = {
401 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
402 };
403 struct sock_fprog prog = {
404 .len = (unsigned short)ARRAY_SIZE(filter),
405 .filter = filter,
406 };
407 long ret;
408
409 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
410 ASSERT_EQ(0, ret);
411
412 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
413 ASSERT_EQ(0, ret);
414
415 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0);
416 EXPECT_EQ(-1, ret);
417 EXPECT_EQ(EINVAL, errno);
418}
419
420
421TEST(mode_filter_get_seccomp)
422{
423 struct sock_filter filter[] = {
424 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
425 };
426 struct sock_fprog prog = {
427 .len = (unsigned short)ARRAY_SIZE(filter),
428 .filter = filter,
429 };
430 long ret;
431
432 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
433 ASSERT_EQ(0, ret);
434
435 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
436 EXPECT_EQ(0, ret);
437
438 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
439 ASSERT_EQ(0, ret);
440
441 ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
442 EXPECT_EQ(2, ret);
443}
444
445
446TEST(ALLOW_all)
447{
448 struct sock_filter filter[] = {
449 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
450 };
451 struct sock_fprog prog = {
452 .len = (unsigned short)ARRAY_SIZE(filter),
453 .filter = filter,
454 };
455 long ret;
456
457 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
458 ASSERT_EQ(0, ret);
459
460 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
461 ASSERT_EQ(0, ret);
462}
463
464TEST(empty_prog)
465{
466 struct sock_filter filter[] = {
467 };
468 struct sock_fprog prog = {
469 .len = (unsigned short)ARRAY_SIZE(filter),
470 .filter = filter,
471 };
472 long ret;
473
474 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
475 ASSERT_EQ(0, ret);
476
477 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
478 EXPECT_EQ(-1, ret);
479 EXPECT_EQ(EINVAL, errno);
480}
481
59f5cf44
TH		 482TEST(log_all)
483{
484 struct sock_filter filter[] = {
485 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
486 };
487 struct sock_fprog prog = {
488 .len = (unsigned short)ARRAY_SIZE(filter),
489 .filter = filter,
490 };
491 long ret;
492 pid_t parent = getppid();
493
494 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
495 ASSERT_EQ(0, ret);
496
497 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
498 ASSERT_EQ(0, ret);
499
500 /* getppid() should succeed and be logged (no check for logging) */
501 EXPECT_EQ(parent, syscall(__NR_getppid));
502}
503
c99ee51a
KC		 504TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS)
505{
506 struct sock_filter filter[] = {
507 BPF_STMT(BPF_RET|BPF_K, 0x10000000U),
508 };
509 struct sock_fprog prog = {
510 .len = (unsigned short)ARRAY_SIZE(filter),
511 .filter = filter,
512 };
513 long ret;
514
515 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
516 ASSERT_EQ(0, ret);
517
518 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
519 ASSERT_EQ(0, ret);
520 EXPECT_EQ(0, syscall(__NR_getpid)) {
521 TH_LOG("getpid() shouldn't ever return");
522 }
523}
524
525/* return code >= 0x80000000 is unused. */
526TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS)
527{
528 struct sock_filter filter[] = {
529 BPF_STMT(BPF_RET|BPF_K, 0x90000000U),
530 };
531 struct sock_fprog prog = {
532 .len = (unsigned short)ARRAY_SIZE(filter),
533 .filter = filter,
534 };
535 long ret;
536
537 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
538 ASSERT_EQ(0, ret);
539
540 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
541 ASSERT_EQ(0, ret);
542 EXPECT_EQ(0, syscall(__NR_getpid)) {
543 TH_LOG("getpid() shouldn't ever return");
544 }
545}
546
547TEST_SIGNAL(KILL_all, SIGSYS)
548{
549 struct sock_filter filter[] = {
550 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
551 };
552 struct sock_fprog prog = {
553 .len = (unsigned short)ARRAY_SIZE(filter),
554 .filter = filter,
555 };
556 long ret;
557
558 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
559 ASSERT_EQ(0, ret);
560
561 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
562 ASSERT_EQ(0, ret);
563}
564
565TEST_SIGNAL(KILL_one, SIGSYS)
566{
567 struct sock_filter filter[] = {
568 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
569 offsetof(struct seccomp_data, nr)),
570 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
571 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
572 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
573 };
574 struct sock_fprog prog = {
575 .len = (unsigned short)ARRAY_SIZE(filter),
576 .filter = filter,
577 };
578 long ret;
579 pid_t parent = getppid();
580
581 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
582 ASSERT_EQ(0, ret);
583
584 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
585 ASSERT_EQ(0, ret);
586
587 EXPECT_EQ(parent, syscall(__NR_getppid));
588 /* getpid() should never return. */
589 EXPECT_EQ(0, syscall(__NR_getpid));
590}
591
592TEST_SIGNAL(KILL_one_arg_one, SIGSYS)
593{
fd88d16c 594 void *fatal_address;
c99ee51a
KC		 595 struct sock_filter filter[] = {
596 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
597 offsetof(struct seccomp_data, nr)),
fd88d16c 598 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0),
c99ee51a
KC		 599 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
600 /* Only both with lower 32-bit for now. */
601 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)),
fd88d16c
RS		 602 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K,
603 (unsigned long)&fatal_address, 0, 1),
c99ee51a
KC		 604 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
605 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
606 };
607 struct sock_fprog prog = {
608 .len = (unsigned short)ARRAY_SIZE(filter),
609 .filter = filter,
610 };
611 long ret;
612 pid_t parent = getppid();
fd88d16c
RS		 613 struct tms timebuf;
614 clock_t clock = times(&timebuf);
c99ee51a
KC		 615
616 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
617 ASSERT_EQ(0, ret);
618
619 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
620 ASSERT_EQ(0, ret);
621
622 EXPECT_EQ(parent, syscall(__NR_getppid));
fd88d16c
RS		 623 EXPECT_LE(clock, syscall(__NR_times, &timebuf));
624 /* times() should never return. */
625 EXPECT_EQ(0, syscall(__NR_times, &fatal_address));
c99ee51a
KC		 626}
627
628TEST_SIGNAL(KILL_one_arg_six, SIGSYS)
629{
fd88d16c
RS		 630#ifndef __NR_mmap2
631 int sysno = __NR_mmap;
632#else
633 int sysno = __NR_mmap2;
634#endif
c99ee51a
KC		 635 struct sock_filter filter[] = {
636 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
637 offsetof(struct seccomp_data, nr)),
fd88d16c 638 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0),
c99ee51a
KC		 639 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
640 /* Only both with lower 32-bit for now. */
641 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)),
642 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1),
643 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
644 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
645 };
646 struct sock_fprog prog = {
647 .len = (unsigned short)ARRAY_SIZE(filter),
648 .filter = filter,
649 };
650 long ret;
651 pid_t parent = getppid();
fd88d16c
RS		 652 int fd;
653 void *map1, *map2;
2ce47b44
BJZ		 654 int page_size = sysconf(_SC_PAGESIZE);
655
656 ASSERT_LT(0, page_size);
c99ee51a
KC		 657
658 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
659 ASSERT_EQ(0, ret);
660
661 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
662 ASSERT_EQ(0, ret);
663
fd88d16c
RS		 664 fd = open("/dev/zero", O_RDONLY);
665 ASSERT_NE(-1, fd);
666
c99ee51a 667 EXPECT_EQ(parent, syscall(__NR_getppid));
fd88d16c 668 map1 = (void *)syscall(sysno,
2ce47b44 669 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size);
fd88d16c
RS		 670 EXPECT_NE(MAP_FAILED, map1);
671 /* mmap2() should never return. */
672 map2 = (void *)syscall(sysno,
2ce47b44 673 NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE);
fd88d16c
RS		 674 EXPECT_EQ(MAP_FAILED, map2);
675
676 /* The test failed, so clean up the resources. */
2ce47b44
BJZ		 677 munmap(map1, page_size);
678 munmap(map2, page_size);
fd88d16c 679 close(fd);
c99ee51a
KC		 680}
681
f3e1821d
KC		 682/* This is a thread task to die via seccomp filter violation. */
683void *kill_thread(void *data)
684{
685 bool die = (bool)data;
686
687 if (die) {
688 prctl(PR_GET_SECCOMP, 0, 0, 0, 0);
689 return (void *)SIBLING_EXIT_FAILURE;
690 }
691
692 return (void *)SIBLING_EXIT_UNKILLED;
693}
694
695/* Prepare a thread that will kill itself or both of us. */
696void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process)
697{
698 pthread_t thread;
699 void *status;
700 /* Kill only when calling __NR_prctl. */
701 struct sock_filter filter_thread[] = {
702 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
703 offsetof(struct seccomp_data, nr)),
704 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
705 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD),
706 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
707 };
708 struct sock_fprog prog_thread = {
709 .len = (unsigned short)ARRAY_SIZE(filter_thread),
710 .filter = filter_thread,
711 };
712 struct sock_filter filter_process[] = {
713 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
714 offsetof(struct seccomp_data, nr)),
715 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
716 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS),
717 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
718 };
719 struct sock_fprog prog_process = {
720 .len = (unsigned short)ARRAY_SIZE(filter_process),
721 .filter = filter_process,
722 };
723
724 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
725 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
726 }
727
728 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0,
729 kill_process ? &prog_process : &prog_thread));
730
731 /*
732 * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS
733 * flag cannot be downgraded by a new filter.
734 */
735 ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread));
736
737 /* Start a thread that will exit immediately. */
738 ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false));
739 ASSERT_EQ(0, pthread_join(thread, &status));
740 ASSERT_EQ(SIBLING_EXIT_UNKILLED, (unsigned long)status);
741
742 /* Start a thread that will die immediately. */
743 ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)true));
744 ASSERT_EQ(0, pthread_join(thread, &status));
745 ASSERT_NE(SIBLING_EXIT_FAILURE, (unsigned long)status);
746
747 /*
748 * If we get here, only the spawned thread died. Let the parent know
749 * the whole process didn't die (i.e. this thread, the spawner,
750 * stayed running).
751 */
752 exit(42);
753}
754
755TEST(KILL_thread)
756{
757 int status;
758 pid_t child_pid;
759
760 child_pid = fork();
761 ASSERT_LE(0, child_pid);
762 if (child_pid == 0) {
763 kill_thread_or_group(_metadata, false);
764 _exit(38);
765 }
766
767 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
768
769 /* If only the thread was killed, we'll see exit 42. */
770 ASSERT_TRUE(WIFEXITED(status));
771 ASSERT_EQ(42, WEXITSTATUS(status));
772}
773
774TEST(KILL_process)
775{
776 int status;
777 pid_t child_pid;
778
779 child_pid = fork();
780 ASSERT_LE(0, child_pid);
781 if (child_pid == 0) {
782 kill_thread_or_group(_metadata, true);
783 _exit(38);
784 }
785
786 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
787
788 /* If the entire process was killed, we'll see SIGSYS. */
789 ASSERT_TRUE(WIFSIGNALED(status));
790 ASSERT_EQ(SIGSYS, WTERMSIG(status));
791}
792
c99ee51a
KC		 793/* TODO(wad) add 64-bit versus 32-bit arg tests. */
794TEST(arg_out_of_range)
795{
796 struct sock_filter filter[] = {
797 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)),
798 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
799 };
800 struct sock_fprog prog = {
801 .len = (unsigned short)ARRAY_SIZE(filter),
802 .filter = filter,
803 };
804 long ret;
805
806 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
807 ASSERT_EQ(0, ret);
808
809 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog);
810 EXPECT_EQ(-1, ret);
811 EXPECT_EQ(EINVAL, errno);
812}
813
f3f6e306
KC		 814#define ERRNO_FILTER(name, errno) \
815 struct sock_filter _read_filter_##name[] = { \
816 BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \
817 offsetof(struct seccomp_data, nr)), \
818 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \
819 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \
820 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \
821 }; \
822 struct sock_fprog prog_##name = { \
823 .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \
824 .filter = _read_filter_##name, \
825 }
826
827/* Make sure basic errno values are correctly passed through a filter. */
c99ee51a
KC		 828TEST(ERRNO_valid)
829{
f3f6e306 830 ERRNO_FILTER(valid, E2BIG);
c99ee51a
KC		 831 long ret;
832 pid_t parent = getppid();
833
834 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
835 ASSERT_EQ(0, ret);
836
f3f6e306 837 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid);
c99ee51a
KC		 838 ASSERT_EQ(0, ret);
839
840 EXPECT_EQ(parent, syscall(__NR_getppid));
841 EXPECT_EQ(-1, read(0, NULL, 0));
842 EXPECT_EQ(E2BIG, errno);
843}
844
f3f6e306 845/* Make sure an errno of zero is correctly handled by the arch code. */
c99ee51a
KC		 846TEST(ERRNO_zero)
847{
f3f6e306 848 ERRNO_FILTER(zero, 0);
c99ee51a
KC		 849 long ret;
850 pid_t parent = getppid();
851
852 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
853 ASSERT_EQ(0, ret);
854
f3f6e306 855 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero);
c99ee51a
KC		 856 ASSERT_EQ(0, ret);
857
858 EXPECT_EQ(parent, syscall(__NR_getppid));
859 /* "errno" of 0 is ok. */
860 EXPECT_EQ(0, read(0, NULL, 0));
861}
862
f3f6e306
KC		 863/*
864 * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller.
865 * This tests that the errno value gets capped correctly, fixed by
866 * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO").
867 */
c99ee51a
KC		 868TEST(ERRNO_capped)
869{
f3f6e306 870 ERRNO_FILTER(capped, 4096);
c99ee51a
KC		 871 long ret;
872 pid_t parent = getppid();
873
874 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
875 ASSERT_EQ(0, ret);
876
f3f6e306 877 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped);
c99ee51a
KC		 878 ASSERT_EQ(0, ret);
879
880 EXPECT_EQ(parent, syscall(__NR_getppid));
881 EXPECT_EQ(-1, read(0, NULL, 0));
882 EXPECT_EQ(4095, errno);
883}
884
f3f6e306
KC		 885/*
886 * Filters are processed in reverse order: last applied is executed first.
887 * Since only the SECCOMP_RET_ACTION mask is tested for return values, the
888 * SECCOMP_RET_DATA mask results will follow the most recently applied
889 * matching filter return (and not the lowest or highest value).
890 */
891TEST(ERRNO_order)
892{
893 ERRNO_FILTER(first, 11);
894 ERRNO_FILTER(second, 13);
895 ERRNO_FILTER(third, 12);
896 long ret;
897 pid_t parent = getppid();
898
899 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
900 ASSERT_EQ(0, ret);
901
902 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first);
903 ASSERT_EQ(0, ret);
904
905 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second);
906 ASSERT_EQ(0, ret);
907
908 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third);
909 ASSERT_EQ(0, ret);
910
911 EXPECT_EQ(parent, syscall(__NR_getppid));
912 EXPECT_EQ(-1, read(0, NULL, 0));
913 EXPECT_EQ(12, errno);
914}
915
1ae81d78 916FIXTURE(TRAP) {
c99ee51a
KC		 917 struct sock_fprog prog;
918};
919
920FIXTURE_SETUP(TRAP)
921{
922 struct sock_filter filter[] = {
923 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
924 offsetof(struct seccomp_data, nr)),
925 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
926 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
927 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
928 };
929
930 memset(&self->prog, 0, sizeof(self->prog));
931 self->prog.filter = malloc(sizeof(filter));
932 ASSERT_NE(NULL, self->prog.filter);
933 memcpy(self->prog.filter, filter, sizeof(filter));
934 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
935}
936
937FIXTURE_TEARDOWN(TRAP)
938{
939 if (self->prog.filter)
940 free(self->prog.filter);
941}
942
943TEST_F_SIGNAL(TRAP, dfl, SIGSYS)
944{
945 long ret;
946
947 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
948 ASSERT_EQ(0, ret);
949
950 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
951 ASSERT_EQ(0, ret);
952 syscall(__NR_getpid);
953}
954
955/* Ensure that SIGSYS overrides SIG_IGN */
956TEST_F_SIGNAL(TRAP, ign, SIGSYS)
957{
958 long ret;
959
960 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
961 ASSERT_EQ(0, ret);
962
963 signal(SIGSYS, SIG_IGN);
964
965 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
966 ASSERT_EQ(0, ret);
967 syscall(__NR_getpid);
968}
969
10859f38 970static siginfo_t TRAP_info;
c99ee51a
KC		 971static volatile int TRAP_nr;
972static void TRAP_action(int nr, siginfo_t *info, void *void_context)
973{
974 memcpy(&TRAP_info, info, sizeof(TRAP_info));
975 TRAP_nr = nr;
976}
977
978TEST_F(TRAP, handler)
979{
980 int ret, test;
981 struct sigaction act;
982 sigset_t mask;
983
984 memset(&act, 0, sizeof(act));
985 sigemptyset(&mask);
986 sigaddset(&mask, SIGSYS);
987
988 act.sa_sigaction = &TRAP_action;
989 act.sa_flags = SA_SIGINFO;
990 ret = sigaction(SIGSYS, &act, NULL);
991 ASSERT_EQ(0, ret) {
992 TH_LOG("sigaction failed");
993 }
994 ret = sigprocmask(SIG_UNBLOCK, &mask, NULL);
995 ASSERT_EQ(0, ret) {
996 TH_LOG("sigprocmask failed");
997 }
998
999 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1000 ASSERT_EQ(0, ret);
1001 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog);
1002 ASSERT_EQ(0, ret);
1003 TRAP_nr = 0;
1004 memset(&TRAP_info, 0, sizeof(TRAP_info));
1005 /* Expect the registers to be rolled back. (nr = error) may vary
1006 * based on arch. */
1007 ret = syscall(__NR_getpid);
1008 /* Silence gcc warning about volatile. */
1009 test = TRAP_nr;
1010 EXPECT_EQ(SIGSYS, test);
1011 struct local_sigsys {
1012 void *_call_addr; /* calling user insn */
1013 int _syscall; /* triggering system call number */
1014 unsigned int _arch; /* AUDIT_ARCH_* of syscall */
1015 } *sigsys = (struct local_sigsys *)
1016#ifdef si_syscall
1017 &(TRAP_info.si_call_addr);
1018#else
1019 &TRAP_info.si_pid;
1020#endif
1021 EXPECT_EQ(__NR_getpid, sigsys->_syscall);
1022 /* Make sure arch is non-zero. */
1023 EXPECT_NE(0, sigsys->_arch);
1024 EXPECT_NE(0, (unsigned long)sigsys->_call_addr);
1025}
1026
1ae81d78 1027FIXTURE(precedence) {
c99ee51a 1028 struct sock_fprog allow;
59f5cf44 1029 struct sock_fprog log;
c99ee51a
KC		 1030 struct sock_fprog trace;
1031 struct sock_fprog error;
1032 struct sock_fprog trap;
1033 struct sock_fprog kill;
1034};
1035
1036FIXTURE_SETUP(precedence)
1037{
1038 struct sock_filter allow_insns[] = {
1039 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1040 };
59f5cf44
TH		 1041 struct sock_filter log_insns[] = {
1042 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1043 offsetof(struct seccomp_data, nr)),
1044 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1045 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1046 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG),
1047 };
c99ee51a
KC		 1048 struct sock_filter trace_insns[] = {
1049 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1050 offsetof(struct seccomp_data, nr)),
1051 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1052 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1053 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE),
1054 };
1055 struct sock_filter error_insns[] = {
1056 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1057 offsetof(struct seccomp_data, nr)),
1058 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1059 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1060 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO),
1061 };
1062 struct sock_filter trap_insns[] = {
1063 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1064 offsetof(struct seccomp_data, nr)),
1065 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1066 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1067 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),
1068 };
1069 struct sock_filter kill_insns[] = {
1070 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1071 offsetof(struct seccomp_data, nr)),
1072 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0),
1073 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1074 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
1075 };
1076
1077 memset(self, 0, sizeof(*self));
1078#define FILTER_ALLOC(_x) \
1079 self->_x.filter = malloc(sizeof(_x##_insns)); \
1080 ASSERT_NE(NULL, self->_x.filter); \
1081 memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \
1082 self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns)
1083 FILTER_ALLOC(allow);
59f5cf44 1084 FILTER_ALLOC(log);
c99ee51a
KC		 1085 FILTER_ALLOC(trace);
1086 FILTER_ALLOC(error);
1087 FILTER_ALLOC(trap);
1088 FILTER_ALLOC(kill);
1089}
1090
1091FIXTURE_TEARDOWN(precedence)
1092{
1093#define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter)
1094 FILTER_FREE(allow);
59f5cf44 1095 FILTER_FREE(log);
c99ee51a
KC		 1096 FILTER_FREE(trace);
1097 FILTER_FREE(error);
1098 FILTER_FREE(trap);
1099 FILTER_FREE(kill);
1100}
1101
1102TEST_F(precedence, allow_ok)
1103{
1104 pid_t parent, res = 0;
1105 long ret;
1106
1107 parent = getppid();
1108 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1109 ASSERT_EQ(0, ret);
1110
1111 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1112 ASSERT_EQ(0, ret);
59f5cf44
TH		 1113 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1114 ASSERT_EQ(0, ret);
c99ee51a
KC		 1115 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1116 ASSERT_EQ(0, ret);
1117 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1118 ASSERT_EQ(0, ret);
1119 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1120 ASSERT_EQ(0, ret);
1121 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1122 ASSERT_EQ(0, ret);
1123 /* Should work just fine. */
1124 res = syscall(__NR_getppid);
1125 EXPECT_EQ(parent, res);
1126}
1127
1128TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS)
1129{
1130 pid_t parent, res = 0;
1131 long ret;
1132
1133 parent = getppid();
1134 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1135 ASSERT_EQ(0, ret);
1136
1137 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1138 ASSERT_EQ(0, ret);
59f5cf44
TH		 1139 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1140 ASSERT_EQ(0, ret);
c99ee51a
KC		 1141 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1142 ASSERT_EQ(0, ret);
1143 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1144 ASSERT_EQ(0, ret);
1145 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1146 ASSERT_EQ(0, ret);
1147 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1148 ASSERT_EQ(0, ret);
1149 /* Should work just fine. */
1150 res = syscall(__NR_getppid);
1151 EXPECT_EQ(parent, res);
1152 /* getpid() should never return. */
1153 res = syscall(__NR_getpid);
1154 EXPECT_EQ(0, res);
1155}
1156
1157TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS)
1158{
1159 pid_t parent;
1160 long ret;
1161
1162 parent = getppid();
1163 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1164 ASSERT_EQ(0, ret);
1165
1166 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1167 ASSERT_EQ(0, ret);
1168 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill);
1169 ASSERT_EQ(0, ret);
1170 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1171 ASSERT_EQ(0, ret);
59f5cf44
TH		 1172 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1173 ASSERT_EQ(0, ret);
c99ee51a
KC		 1174 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1175 ASSERT_EQ(0, ret);
1176 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1177 ASSERT_EQ(0, ret);
1178 /* Should work just fine. */
1179 EXPECT_EQ(parent, syscall(__NR_getppid));
1180 /* getpid() should never return. */
1181 EXPECT_EQ(0, syscall(__NR_getpid));
1182}
1183
1184TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS)
1185{
1186 pid_t parent;
1187 long ret;
1188
1189 parent = getppid();
1190 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1191 ASSERT_EQ(0, ret);
1192
1193 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1194 ASSERT_EQ(0, ret);
59f5cf44
TH		 1195 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1196 ASSERT_EQ(0, ret);
c99ee51a
KC		 1197 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1198 ASSERT_EQ(0, ret);
1199 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1200 ASSERT_EQ(0, ret);
1201 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1202 ASSERT_EQ(0, ret);
1203 /* Should work just fine. */
1204 EXPECT_EQ(parent, syscall(__NR_getppid));
1205 /* getpid() should never return. */
1206 EXPECT_EQ(0, syscall(__NR_getpid));
1207}
1208
1209TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS)
1210{
1211 pid_t parent;
1212 long ret;
1213
1214 parent = getppid();
1215 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1216 ASSERT_EQ(0, ret);
1217
1218 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1219 ASSERT_EQ(0, ret);
1220 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap);
1221 ASSERT_EQ(0, ret);
59f5cf44
TH		 1222 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1223 ASSERT_EQ(0, ret);
c99ee51a
KC		 1224 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1225 ASSERT_EQ(0, ret);
1226 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1227 ASSERT_EQ(0, ret);
1228 /* Should work just fine. */
1229 EXPECT_EQ(parent, syscall(__NR_getppid));
1230 /* getpid() should never return. */
1231 EXPECT_EQ(0, syscall(__NR_getpid));
1232}
1233
1234TEST_F(precedence, errno_is_third)
1235{
1236 pid_t parent;
1237 long ret;
1238
1239 parent = getppid();
1240 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1241 ASSERT_EQ(0, ret);
1242
1243 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1244 ASSERT_EQ(0, ret);
59f5cf44
TH		 1245 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1246 ASSERT_EQ(0, ret);
c99ee51a
KC		 1247 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1248 ASSERT_EQ(0, ret);
1249 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1250 ASSERT_EQ(0, ret);
1251 /* Should work just fine. */
1252 EXPECT_EQ(parent, syscall(__NR_getppid));
1253 EXPECT_EQ(0, syscall(__NR_getpid));
1254}
1255
1256TEST_F(precedence, errno_is_third_in_any_order)
1257{
1258 pid_t parent;
1259 long ret;
1260
1261 parent = getppid();
1262 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1263 ASSERT_EQ(0, ret);
1264
59f5cf44
TH		 1265 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1266 ASSERT_EQ(0, ret);
c99ee51a
KC		 1267 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error);
1268 ASSERT_EQ(0, ret);
1269 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1270 ASSERT_EQ(0, ret);
1271 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1272 ASSERT_EQ(0, ret);
1273 /* Should work just fine. */
1274 EXPECT_EQ(parent, syscall(__NR_getppid));
1275 EXPECT_EQ(0, syscall(__NR_getpid));
1276}
1277
1278TEST_F(precedence, trace_is_fourth)
1279{
1280 pid_t parent;
1281 long ret;
1282
1283 parent = getppid();
1284 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1285 ASSERT_EQ(0, ret);
1286
1287 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1288 ASSERT_EQ(0, ret);
59f5cf44
TH		 1289 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1290 ASSERT_EQ(0, ret);
c99ee51a
KC		 1291 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1292 ASSERT_EQ(0, ret);
1293 /* Should work just fine. */
1294 EXPECT_EQ(parent, syscall(__NR_getppid));
1295 /* No ptracer */
1296 EXPECT_EQ(-1, syscall(__NR_getpid));
1297}
1298
1299TEST_F(precedence, trace_is_fourth_in_any_order)
1300{
1301 pid_t parent;
1302 long ret;
1303
1304 parent = getppid();
1305 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1306 ASSERT_EQ(0, ret);
1307
1308 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace);
1309 ASSERT_EQ(0, ret);
1310 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1311 ASSERT_EQ(0, ret);
59f5cf44
TH		 1312 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1313 ASSERT_EQ(0, ret);
c99ee51a
KC		 1314 /* Should work just fine. */
1315 EXPECT_EQ(parent, syscall(__NR_getppid));
1316 /* No ptracer */
1317 EXPECT_EQ(-1, syscall(__NR_getpid));
1318}
1319
59f5cf44
TH		 1320TEST_F(precedence, log_is_fifth)
1321{
1322 pid_t mypid, parent;
1323 long ret;
1324
1325 mypid = getpid();
1326 parent = getppid();
1327 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1328 ASSERT_EQ(0, ret);
1329
1330 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1331 ASSERT_EQ(0, ret);
1332 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1333 ASSERT_EQ(0, ret);
1334 /* Should work just fine. */
1335 EXPECT_EQ(parent, syscall(__NR_getppid));
1336 /* Should also work just fine */
1337 EXPECT_EQ(mypid, syscall(__NR_getpid));
1338}
1339
1340TEST_F(precedence, log_is_fifth_in_any_order)
1341{
1342 pid_t mypid, parent;
1343 long ret;
1344
1345 mypid = getpid();
1346 parent = getppid();
1347 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1348 ASSERT_EQ(0, ret);
1349
1350 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log);
1351 ASSERT_EQ(0, ret);
1352 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow);
1353 ASSERT_EQ(0, ret);
1354 /* Should work just fine. */
1355 EXPECT_EQ(parent, syscall(__NR_getppid));
1356 /* Should also work just fine */
1357 EXPECT_EQ(mypid, syscall(__NR_getpid));
1358}
1359
c99ee51a
KC		 1360#ifndef PTRACE_O_TRACESECCOMP
1361#define PTRACE_O_TRACESECCOMP 0x00000080
1362#endif
1363
1364/* Catch the Ubuntu 12.04 value error. */
1365#if PTRACE_EVENT_SECCOMP != 7
1366#undef PTRACE_EVENT_SECCOMP
1367#endif
1368
1369#ifndef PTRACE_EVENT_SECCOMP
1370#define PTRACE_EVENT_SECCOMP 7
1371#endif
1372
1373#define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP)
1374bool tracer_running;
1375void tracer_stop(int sig)
1376{
1377 tracer_running = false;
1378}
1379
1380typedef void tracer_func_t(struct __test_metadata *_metadata,
1381 pid_t tracee, int status, void *args);
1382
58d0a862
KC		 1383void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee,
1384 tracer_func_t tracer_func, void *args, bool ptrace_syscall)
c99ee51a
KC		 1385{
1386 int ret = -1;
1387 struct sigaction action = {
1388 .sa_handler = tracer_stop,
1389 };
1390
1391 /* Allow external shutdown. */
1392 tracer_running = true;
1393 ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL));
1394
1395 errno = 0;
1396 while (ret == -1 && errno != EINVAL)
1397 ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0);
1398 ASSERT_EQ(0, ret) {
1399 kill(tracee, SIGKILL);
1400 }
1401 /* Wait for attach stop */
1402 wait(NULL);
1403
58d0a862
KC		 1404 ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ?
1405 PTRACE_O_TRACESYSGOOD :
1406 PTRACE_O_TRACESECCOMP);
c99ee51a
KC		 1407 ASSERT_EQ(0, ret) {
1408 TH_LOG("Failed to set PTRACE_O_TRACESECCOMP");
1409 kill(tracee, SIGKILL);
1410 }
58d0a862
KC		 1411 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1412 tracee, NULL, 0);
1413 ASSERT_EQ(0, ret);
c99ee51a
KC		 1414
1415 /* Unblock the tracee */
1416 ASSERT_EQ(1, write(fd, "A", 1));
1417 ASSERT_EQ(0, close(fd));
1418
1419 /* Run until we're shut down. Must assert to stop execution. */
1420 while (tracer_running) {
1421 int status;
1422
1423 if (wait(&status) != tracee)
1424 continue;
1425 if (WIFSIGNALED(status) || WIFEXITED(status))
1426 /* Child is dead. Time to go. */
1427 return;
1428
58d0a862
KC		 1429 /* Check if this is a seccomp event. */
1430 ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status));
c99ee51a
KC		 1431
1432 tracer_func(_metadata, tracee, status, args);
1433
58d0a862
KC		 1434 ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT,
1435 tracee, NULL, 0);
c99ee51a
KC		 1436 ASSERT_EQ(0, ret);
1437 }
1438 /* Directly report the status of our test harness results. */
1439 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE);
1440}
1441
1442/* Common tracer setup/teardown functions. */
1443void cont_handler(int num)
1444{ }
1445pid_t setup_trace_fixture(struct __test_metadata *_metadata,
58d0a862 1446 tracer_func_t func, void *args, bool ptrace_syscall)
c99ee51a
KC		 1447{
1448 char sync;
1449 int pipefd[2];
1450 pid_t tracer_pid;
1451 pid_t tracee = getpid();
1452
1453 /* Setup a pipe for clean synchronization. */
1454 ASSERT_EQ(0, pipe(pipefd));
1455
1456 /* Fork a child which we'll promote to tracer */
1457 tracer_pid = fork();
1458 ASSERT_LE(0, tracer_pid);
1459 signal(SIGALRM, cont_handler);
1460 if (tracer_pid == 0) {
1461 close(pipefd[0]);
58d0a862
KC		 1462 start_tracer(_metadata, pipefd[1], tracee, func, args,
1463 ptrace_syscall);
c99ee51a
KC		 1464 syscall(__NR_exit, 0);
1465 }
1466 close(pipefd[1]);
1467 prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0);
1468 read(pipefd[0], &sync, 1);
1469 close(pipefd[0]);
1470
1471 return tracer_pid;
1472}
1473void teardown_trace_fixture(struct __test_metadata *_metadata,
1474 pid_t tracer)
1475{
1476 if (tracer) {
1477 int status;
1478 /*
1479 * Extract the exit code from the other process and
1480 * adopt it for ourselves in case its asserts failed.
1481 */
1482 ASSERT_EQ(0, kill(tracer, SIGUSR1));
1483 ASSERT_EQ(tracer, waitpid(tracer, &status, 0));
1484 if (WEXITSTATUS(status))
1485 _metadata->passed = 0;
1486 }
1487}
1488
1489/* "poke" tracer arguments and function. */
1490struct tracer_args_poke_t {
1491 unsigned long poke_addr;
1492};
1493
1494void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status,
1495 void *args)
1496{
1497 int ret;
1498 unsigned long msg;
1499 struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args;
1500
1501 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1502 EXPECT_EQ(0, ret);
1503 /* If this fails, don't try to recover. */
1504 ASSERT_EQ(0x1001, msg) {
1505 kill(tracee, SIGKILL);
1506 }
1507 /*
1508 * Poke in the message.
1509 * Registers are not touched to try to keep this relatively arch
1510 * agnostic.
1511 */
1512 ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001);
1513 EXPECT_EQ(0, ret);
1514}
1515
1ae81d78 1516FIXTURE(TRACE_poke) {
c99ee51a
KC		 1517 struct sock_fprog prog;
1518 pid_t tracer;
1519 long poked;
1520 struct tracer_args_poke_t tracer_args;
1521};
1522
1523FIXTURE_SETUP(TRACE_poke)
1524{
1525 struct sock_filter filter[] = {
1526 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1527 offsetof(struct seccomp_data, nr)),
1528 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
1529 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001),
1530 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1531 };
1532
1533 self->poked = 0;
1534 memset(&self->prog, 0, sizeof(self->prog));
1535 self->prog.filter = malloc(sizeof(filter));
1536 ASSERT_NE(NULL, self->prog.filter);
1537 memcpy(self->prog.filter, filter, sizeof(filter));
1538 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1539
1540 /* Set up tracer args. */
1541 self->tracer_args.poke_addr = (unsigned long)&self->poked;
1542
1543 /* Launch tracer. */
1544 self->tracer = setup_trace_fixture(_metadata, tracer_poke,
58d0a862 1545 &self->tracer_args, false);
c99ee51a
KC		 1546}
1547
1548FIXTURE_TEARDOWN(TRACE_poke)
1549{
1550 teardown_trace_fixture(_metadata, self->tracer);
1551 if (self->prog.filter)
1552 free(self->prog.filter);
1553}
1554
1555TEST_F(TRACE_poke, read_has_side_effects)
1556{
1557 ssize_t ret;
1558
1559 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1560 ASSERT_EQ(0, ret);
1561
1562 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1563 ASSERT_EQ(0, ret);
1564
1565 EXPECT_EQ(0, self->poked);
1566 ret = read(-1, NULL, 0);
1567 EXPECT_EQ(-1, ret);
1568 EXPECT_EQ(0x1001, self->poked);
1569}
1570
1571TEST_F(TRACE_poke, getpid_runs_normally)
1572{
1573 long ret;
1574
1575 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1576 ASSERT_EQ(0, ret);
1577
1578 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1579 ASSERT_EQ(0, ret);
1580
1581 EXPECT_EQ(0, self->poked);
1582 EXPECT_NE(0, syscall(__NR_getpid));
1583 EXPECT_EQ(0, self->poked);
1584}
1585
1586#if defined(__x86_64__)
1587# define ARCH_REGS struct user_regs_struct
1588# define SYSCALL_NUM orig_rax
1589# define SYSCALL_RET rax
1590#elif defined(__i386__)
1591# define ARCH_REGS struct user_regs_struct
1592# define SYSCALL_NUM orig_eax
1593# define SYSCALL_RET eax
1594#elif defined(__arm__)
1595# define ARCH_REGS struct pt_regs
1596# define SYSCALL_NUM ARM_r7
1597# define SYSCALL_RET ARM_r0
1598#elif defined(__aarch64__)
1599# define ARCH_REGS struct user_pt_regs
1600# define SYSCALL_NUM regs[8]
1601# define SYSCALL_RET regs[0]
5340627e
DA		 1602#elif defined(__riscv) && __riscv_xlen == 64
1603# define ARCH_REGS struct user_regs_struct
1604# define SYSCALL_NUM a7
1605# define SYSCALL_RET a0
64e2a42b
HD		 1606#elif defined(__hppa__)
1607# define ARCH_REGS struct user_regs_struct
1608# define SYSCALL_NUM gr[20]
1609# define SYSCALL_RET gr[28]
5d83c2b3
ME		 1610#elif defined(__powerpc__)
1611# define ARCH_REGS struct pt_regs
1612# define SYSCALL_NUM gpr[0]
1613# define SYSCALL_RET gpr[3]
b623c4da
KC		 1614#elif defined(__s390__)
1615# define ARCH_REGS s390_regs
1616# define SYSCALL_NUM gprs[2]
1617# define SYSCALL_RET gprs[2]
0ce105bf
MR		 1618#elif defined(__mips__)
1619# define ARCH_REGS struct pt_regs
1620# define SYSCALL_NUM regs[2]
1621# define SYSCALL_SYSCALL_NUM regs[4]
1622# define SYSCALL_RET regs[2]
1623# define SYSCALL_NUM_RET_SHARE_REG
c99ee51a
KC		 1624#else
1625# error "Do not know how to find your architecture's registers and syscalls"
1626#endif
1627
a33b2d03
KC		 1628/* When the syscall return can't be changed, stub out the tests for it. */
1629#ifdef SYSCALL_NUM_RET_SHARE_REG
1630# define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action)
1631#else
ed5f1326
KC		 1632# define EXPECT_SYSCALL_RETURN(val, action) \
1633 do { \
1634 errno = 0; \
1635 if (val < 0) { \
1636 EXPECT_EQ(-1, action); \
1637 EXPECT_EQ(-(val), errno); \
1638 } else { \
1639 EXPECT_EQ(val, action); \
1640 } \
1641 } while (0)
a33b2d03
KC		 1642#endif
1643
4a0b8807
MS		 1644/* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for
1645 * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux).
1646 */
0ce105bf 1647#if defined(__x86_64__) || defined(__i386__) || defined(__mips__)
4a0b8807
MS		 1648#define HAVE_GETREGS
1649#endif
1650
c99ee51a
KC		 1651/* Architecture-specific syscall fetching routine. */
1652int get_syscall(struct __test_metadata *_metadata, pid_t tracee)
1653{
c99ee51a 1654 ARCH_REGS regs;
4a0b8807
MS		 1655#ifdef HAVE_GETREGS
1656 EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, &regs)) {
1657 TH_LOG("PTRACE_GETREGS failed");
1658 return -1;
1659 }
1660#else
1661 struct iovec iov;
c99ee51a
KC		 1662
1663 iov.iov_base = &regs;
1664 iov.iov_len = sizeof(regs);
1665 EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) {
1666 TH_LOG("PTRACE_GETREGSET failed");
1667 return -1;
1668 }
4a0b8807 1669#endif
c99ee51a 1670
0ce105bf
MR		 1671#if defined(__mips__)
1672 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1673 return regs.SYSCALL_SYSCALL_NUM;
1674#endif
c99ee51a
KC		 1675 return regs.SYSCALL_NUM;
1676}
1677
1678/* Architecture-specific syscall changing routine. */
1679void change_syscall(struct __test_metadata *_metadata,
ed5f1326 1680 pid_t tracee, int syscall, int result)
c99ee51a 1681{
c99ee51a
KC		 1682 int ret;
1683 ARCH_REGS regs;
4a0b8807
MS		 1684#ifdef HAVE_GETREGS
1685 ret = ptrace(PTRACE_GETREGS, tracee, 0, &regs);
1686#else
1687 struct iovec iov;
c99ee51a
KC		 1688 iov.iov_base = &regs;
1689 iov.iov_len = sizeof(regs);
1690 ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov);
4a0b8807 1691#endif
34a048cc 1692 EXPECT_EQ(0, ret) {}
c99ee51a 1693
256d0afb 1694#if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \
5340627e 1695 defined(__s390__) || defined(__hppa__) || defined(__riscv)
c99ee51a
KC		 1696 {
1697 regs.SYSCALL_NUM = syscall;
1698 }
0ce105bf
MR		 1699#elif defined(__mips__)
1700 {
1701 if (regs.SYSCALL_NUM == __NR_O32_Linux)
1702 regs.SYSCALL_SYSCALL_NUM = syscall;
1703 else
1704 regs.SYSCALL_NUM = syscall;
1705 }
c99ee51a
KC		 1706
1707#elif defined(__arm__)
1708# ifndef PTRACE_SET_SYSCALL
1709# define PTRACE_SET_SYSCALL 23
1710# endif
1711 {
1712 ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall);
1713 EXPECT_EQ(0, ret);
1714 }
1715
256d0afb
KC		 1716#elif defined(__aarch64__)
1717# ifndef NT_ARM_SYSTEM_CALL
1718# define NT_ARM_SYSTEM_CALL 0x404
1719# endif
1720 {
1721 iov.iov_base = &syscall;
1722 iov.iov_len = sizeof(syscall);
1723 ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL,
1724 &iov);
1725 EXPECT_EQ(0, ret);
1726 }
1727
c99ee51a
KC		 1728#else
1729 ASSERT_EQ(1, 0) {
1730 TH_LOG("How is the syscall changed on this architecture?");
1731 }
1732#endif
1733
1734 /* If syscall is skipped, change return value. */
1735 if (syscall == -1)
0ce105bf
MR		 1736#ifdef SYSCALL_NUM_RET_SHARE_REG
1737 TH_LOG("Can't modify syscall return on this architecture");
1738#else
ed5f1326 1739 regs.SYSCALL_RET = result;
0ce105bf 1740#endif
c99ee51a 1741
4a0b8807
MS		 1742#ifdef HAVE_GETREGS
1743 ret = ptrace(PTRACE_SETREGS, tracee, 0, &regs);
1744#else
256d0afb
KC		 1745 iov.iov_base = &regs;
1746 iov.iov_len = sizeof(regs);
c99ee51a 1747 ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov);
4a0b8807 1748#endif
c99ee51a
KC		 1749 EXPECT_EQ(0, ret);
1750}
1751
1752void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee,
1753 int status, void *args)
1754{
1755 int ret;
1756 unsigned long msg;
1757
1758 /* Make sure we got the right message. */
1759 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1760 EXPECT_EQ(0, ret);
1761
b623c4da 1762 /* Validate and take action on expected syscalls. */
c99ee51a
KC		 1763 switch (msg) {
1764 case 0x1002:
1765 /* change getpid to getppid. */
b623c4da 1766 EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee));
ed5f1326 1767 change_syscall(_metadata, tracee, __NR_getppid, 0);
c99ee51a
KC		 1768 break;
1769 case 0x1003:
ed5f1326 1770 /* skip gettid with valid return code. */
b623c4da 1771 EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee));
ed5f1326 1772 change_syscall(_metadata, tracee, -1, 45000);
c99ee51a
KC		 1773 break;
1774 case 0x1004:
ed5f1326
KC		 1775 /* skip openat with error. */
1776 EXPECT_EQ(__NR_openat, get_syscall(_metadata, tracee));
1777 change_syscall(_metadata, tracee, -1, -ESRCH);
1778 break;
1779 case 0x1005:
c99ee51a 1780 /* do nothing (allow getppid) */
b623c4da 1781 EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee));
c99ee51a
KC		 1782 break;
1783 default:
1784 EXPECT_EQ(0, msg) {
1785 TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg);
1786 kill(tracee, SIGKILL);
1787 }
1788 }
1789
1790}
1791
58d0a862
KC		 1792void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee,
1793 int status, void *args)
1794{
1795 int ret, nr;
1796 unsigned long msg;
1797 static bool entry;
1798
201766a2
EK		 1799 /*
1800 * The traditional way to tell PTRACE_SYSCALL entry/exit
1801 * is by counting.
1802 */
1803 entry = !entry;
1804
1805 /* Make sure we got an appropriate message. */
58d0a862
KC		 1806 ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg);
1807 EXPECT_EQ(0, ret);
201766a2
EK		 1808 EXPECT_EQ(entry ? PTRACE_EVENTMSG_SYSCALL_ENTRY
1809 : PTRACE_EVENTMSG_SYSCALL_EXIT, msg);
58d0a862 1810
58d0a862
KC		 1811 if (!entry)
1812 return;
1813
1814 nr = get_syscall(_metadata, tracee);
1815
1816 if (nr == __NR_getpid)
ed5f1326
KC		 1817 change_syscall(_metadata, tracee, __NR_getppid, 0);
1818 if (nr == __NR_gettid)
1819 change_syscall(_metadata, tracee, -1, 45000);
912ec316 1820 if (nr == __NR_openat)
ed5f1326 1821 change_syscall(_metadata, tracee, -1, -ESRCH);
58d0a862
KC		 1822}
1823
1ae81d78 1824FIXTURE(TRACE_syscall) {
c99ee51a
KC		 1825 struct sock_fprog prog;
1826 pid_t tracer, mytid, mypid, parent;
1827};
1828
1829FIXTURE_SETUP(TRACE_syscall)
1830{
1831 struct sock_filter filter[] = {
1832 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1833 offsetof(struct seccomp_data, nr)),
1834 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
1835 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002),
1836 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1),
1837 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003),
ed5f1326 1838 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_openat, 0, 1),
c99ee51a 1839 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004),
ed5f1326
KC		 1840 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1841 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1005),
c99ee51a
KC		 1842 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1843 };
1844
1845 memset(&self->prog, 0, sizeof(self->prog));
1846 self->prog.filter = malloc(sizeof(filter));
1847 ASSERT_NE(NULL, self->prog.filter);
1848 memcpy(self->prog.filter, filter, sizeof(filter));
1849 self->prog.len = (unsigned short)ARRAY_SIZE(filter);
1850
1851 /* Prepare some testable syscall results. */
1852 self->mytid = syscall(__NR_gettid);
1853 ASSERT_GT(self->mytid, 0);
1854 ASSERT_NE(self->mytid, 1) {
1855 TH_LOG("Running this test as init is not supported. :)");
1856 }
1857
1858 self->mypid = getpid();
1859 ASSERT_GT(self->mypid, 0);
1860 ASSERT_EQ(self->mytid, self->mypid);
1861
1862 self->parent = getppid();
1863 ASSERT_GT(self->parent, 0);
1864 ASSERT_NE(self->parent, self->mypid);
1865
1866 /* Launch tracer. */
58d0a862
KC		 1867 self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL,
1868 false);
c99ee51a
KC		 1869}
1870
1871FIXTURE_TEARDOWN(TRACE_syscall)
1872{
1873 teardown_trace_fixture(_metadata, self->tracer);
1874 if (self->prog.filter)
1875 free(self->prog.filter);
1876}
1877
a33b2d03
KC		 1878TEST_F(TRACE_syscall, ptrace_syscall_redirected)
1879{
1880 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1881 teardown_trace_fixture(_metadata, self->tracer);
1882 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1883 true);
1884
1885 /* Tracer will redirect getpid to getppid. */
1886 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1887}
1888
ed5f1326
KC		 1889TEST_F(TRACE_syscall, ptrace_syscall_errno)
1890{
1891 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1892 teardown_trace_fixture(_metadata, self->tracer);
1893 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1894 true);
1895
1896 /* Tracer should skip the open syscall, resulting in ESRCH. */
1897 EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
1898}
1899
1900TEST_F(TRACE_syscall, ptrace_syscall_faked)
a33b2d03
KC		 1901{
1902 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
1903 teardown_trace_fixture(_metadata, self->tracer);
1904 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
1905 true);
1906
ed5f1326
KC		 1907 /* Tracer should skip the gettid syscall, resulting fake pid. */
1908 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
a33b2d03
KC		 1909}
1910
c99ee51a
KC		 1911TEST_F(TRACE_syscall, syscall_allowed)
1912{
1913 long ret;
1914
1915 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1916 ASSERT_EQ(0, ret);
1917
1918 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1919 ASSERT_EQ(0, ret);
1920
1921 /* getppid works as expected (no changes). */
1922 EXPECT_EQ(self->parent, syscall(__NR_getppid));
1923 EXPECT_NE(self->mypid, syscall(__NR_getppid));
1924}
1925
1926TEST_F(TRACE_syscall, syscall_redirected)
1927{
1928 long ret;
1929
1930 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1931 ASSERT_EQ(0, ret);
1932
1933 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1934 ASSERT_EQ(0, ret);
1935
1936 /* getpid has been redirected to getppid as expected. */
1937 EXPECT_EQ(self->parent, syscall(__NR_getpid));
1938 EXPECT_NE(self->mypid, syscall(__NR_getpid));
1939}
1940
ed5f1326
KC		 1941TEST_F(TRACE_syscall, syscall_errno)
1942{
1943 long ret;
1944
1945 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1946 ASSERT_EQ(0, ret);
1947
1948 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1949 ASSERT_EQ(0, ret);
1950
1951 /* openat has been skipped and an errno return. */
1952 EXPECT_SYSCALL_RETURN(-ESRCH, syscall(__NR_openat));
1953}
1954
1955TEST_F(TRACE_syscall, syscall_faked)
c99ee51a
KC		 1956{
1957 long ret;
1958
1959 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1960 ASSERT_EQ(0, ret);
1961
1962 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1963 ASSERT_EQ(0, ret);
1964
1965 /* gettid has been skipped and an altered return value stored. */
ed5f1326 1966 EXPECT_SYSCALL_RETURN(45000, syscall(__NR_gettid));
c99ee51a
KC		 1967}
1968
58d0a862
KC		 1969TEST_F(TRACE_syscall, skip_after_RET_TRACE)
1970{
1971 struct sock_filter filter[] = {
1972 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
1973 offsetof(struct seccomp_data, nr)),
1974 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
1975 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
1976 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
1977 };
1978 struct sock_fprog prog = {
1979 .len = (unsigned short)ARRAY_SIZE(filter),
1980 .filter = filter,
1981 };
1982 long ret;
1983
1984 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
1985 ASSERT_EQ(0, ret);
1986
1987 /* Install fixture filter. */
1988 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
1989 ASSERT_EQ(0, ret);
1990
1991 /* Install "errno on getppid" filter. */
1992 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
1993 ASSERT_EQ(0, ret);
1994
1995 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
a33b2d03 1996 errno = 0;
58d0a862
KC		 1997 EXPECT_EQ(-1, syscall(__NR_getpid));
1998 EXPECT_EQ(EPERM, errno);
1999}
2000
2001TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS)
2002{
2003 struct sock_filter filter[] = {
2004 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2005 offsetof(struct seccomp_data, nr)),
2006 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2007 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2008 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2009 };
2010 struct sock_fprog prog = {
2011 .len = (unsigned short)ARRAY_SIZE(filter),
2012 .filter = filter,
2013 };
2014 long ret;
2015
2016 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2017 ASSERT_EQ(0, ret);
2018
2019 /* Install fixture filter. */
2020 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0);
2021 ASSERT_EQ(0, ret);
2022
2023 /* Install "death on getppid" filter. */
2024 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2025 ASSERT_EQ(0, ret);
2026
2027 /* Tracer will redirect getpid to getppid, and we should die. */
2028 EXPECT_NE(self->mypid, syscall(__NR_getpid));
2029}
2030
2031TEST_F(TRACE_syscall, skip_after_ptrace)
2032{
2033 struct sock_filter filter[] = {
2034 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2035 offsetof(struct seccomp_data, nr)),
2036 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2037 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM),
2038 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2039 };
2040 struct sock_fprog prog = {
2041 .len = (unsigned short)ARRAY_SIZE(filter),
2042 .filter = filter,
2043 };
2044 long ret;
2045
2046 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
2047 teardown_trace_fixture(_metadata, self->tracer);
2048 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
2049 true);
2050
2051 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2052 ASSERT_EQ(0, ret);
2053
2054 /* Install "errno on getppid" filter. */
2055 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2056 ASSERT_EQ(0, ret);
2057
2058 /* Tracer will redirect getpid to getppid, and we should see EPERM. */
2059 EXPECT_EQ(-1, syscall(__NR_getpid));
2060 EXPECT_EQ(EPERM, errno);
2061}
2062
2063TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS)
2064{
2065 struct sock_filter filter[] = {
2066 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2067 offsetof(struct seccomp_data, nr)),
2068 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1),
2069 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2070 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2071 };
2072 struct sock_fprog prog = {
2073 .len = (unsigned short)ARRAY_SIZE(filter),
2074 .filter = filter,
2075 };
2076 long ret;
2077
2078 /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */
2079 teardown_trace_fixture(_metadata, self->tracer);
2080 self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL,
2081 true);
2082
2083 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2084 ASSERT_EQ(0, ret);
2085
2086 /* Install "death on getppid" filter. */
2087 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2088 ASSERT_EQ(0, ret);
2089
2090 /* Tracer will redirect getpid to getppid, and we should die. */
2091 EXPECT_NE(self->mypid, syscall(__NR_getpid));
2092}
2093
c99ee51a
KC		 2094TEST(seccomp_syscall)
2095{
2096 struct sock_filter filter[] = {
2097 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2098 };
2099 struct sock_fprog prog = {
2100 .len = (unsigned short)ARRAY_SIZE(filter),
2101 .filter = filter,
2102 };
2103 long ret;
2104
2105 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2106 ASSERT_EQ(0, ret) {
2107 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2108 }
2109
2110 /* Reject insane operation. */
2111 ret = seccomp(-1, 0, &prog);
b623c4da
KC		 2112 ASSERT_NE(ENOSYS, errno) {
2113 TH_LOG("Kernel does not support seccomp syscall!");
2114 }
c99ee51a
KC		 2115 EXPECT_EQ(EINVAL, errno) {
2116 TH_LOG("Did not reject crazy op value!");
2117 }
2118
2119 /* Reject strict with flags or pointer. */
2120 ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL);
2121 EXPECT_EQ(EINVAL, errno) {
2122 TH_LOG("Did not reject mode strict with flags!");
2123 }
2124 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog);
2125 EXPECT_EQ(EINVAL, errno) {
2126 TH_LOG("Did not reject mode strict with uargs!");
2127 }
2128
2129 /* Reject insane args for filter. */
2130 ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog);
2131 EXPECT_EQ(EINVAL, errno) {
2132 TH_LOG("Did not reject crazy filter flags!");
2133 }
2134 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL);
2135 EXPECT_EQ(EFAULT, errno) {
2136 TH_LOG("Did not reject NULL filter!");
2137 }
2138
2139 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
2140 EXPECT_EQ(0, errno) {
2141 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s",
2142 strerror(errno));
2143 }
2144}
2145
2146TEST(seccomp_syscall_mode_lock)
2147{
2148 struct sock_filter filter[] = {
2149 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2150 };
2151 struct sock_fprog prog = {
2152 .len = (unsigned short)ARRAY_SIZE(filter),
2153 .filter = filter,
2154 };
2155 long ret;
2156
2157 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2158 ASSERT_EQ(0, ret) {
2159 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2160 }
2161
2162 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
b623c4da
KC		 2163 ASSERT_NE(ENOSYS, errno) {
2164 TH_LOG("Kernel does not support seccomp syscall!");
2165 }
c99ee51a
KC		 2166 EXPECT_EQ(0, ret) {
2167 TH_LOG("Could not install filter!");
2168 }
2169
2170 /* Make sure neither entry point will switch to strict. */
2171 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0);
2172 EXPECT_EQ(EINVAL, errno) {
2173 TH_LOG("Switched to mode strict!");
2174 }
2175
2176 ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL);
2177 EXPECT_EQ(EINVAL, errno) {
2178 TH_LOG("Switched to mode strict!");
2179 }
2180}
2181
2b7ea5b5
TH		 2182/*
2183 * Test detection of known and unknown filter flags. Userspace needs to be able
2184 * to check if a filter flag is supported by the current kernel and a good way
2185 * of doing that is by attempting to enter filter mode, with the flag bit in
2186 * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates
2187 * that the flag is valid and EINVAL indicates that the flag is invalid.
2188 */
2189TEST(detect_seccomp_filter_flags)
2190{
e66a3997 2191 unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC,
00a02d0c 2192 SECCOMP_FILTER_FLAG_LOG,
6a21cc50 2193 SECCOMP_FILTER_FLAG_SPEC_ALLOW,
51891498
TA		 2194 SECCOMP_FILTER_FLAG_NEW_LISTENER,
2195 SECCOMP_FILTER_FLAG_TSYNC_ESRCH };
4ee07767
KC		 2196 unsigned int exclusive[] = {
2197 SECCOMP_FILTER_FLAG_TSYNC,
2198 SECCOMP_FILTER_FLAG_NEW_LISTENER };
2199 unsigned int flag, all_flags, exclusive_mask;
2b7ea5b5
TH		 2200 int i;
2201 long ret;
2202
4ee07767 2203 /* Test detection of individual known-good filter flags */
2b7ea5b5 2204 for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) {
00a02d0c
KC		 2205 int bits = 0;
2206
2b7ea5b5 2207 flag = flags[i];
00a02d0c
KC		 2208 /* Make sure the flag is a single bit! */
2209 while (flag) {
2210 if (flag & 0x1)
2211 bits ++;
2212 flag >>= 1;
2213 }
2214 ASSERT_EQ(1, bits);
2215 flag = flags[i];
2216
2b7ea5b5
TH		 2217 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2218 ASSERT_NE(ENOSYS, errno) {
2219 TH_LOG("Kernel does not support seccomp syscall!");
2220 }
2221 EXPECT_EQ(-1, ret);
2222 EXPECT_EQ(EFAULT, errno) {
2223 TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!",
2224 flag);
2225 }
2226
2227 all_flags |= flag;
2228 }
2229
4ee07767
KC		 2230 /*
2231 * Test detection of all known-good filter flags combined. But
2232 * for the exclusive flags we need to mask them out and try them
2233 * individually for the "all flags" testing.
2234 */
2235 exclusive_mask = 0;
2236 for (i = 0; i < ARRAY_SIZE(exclusive); i++)
2237 exclusive_mask |= exclusive[i];
2238 for (i = 0; i < ARRAY_SIZE(exclusive); i++) {
2239 flag = all_flags & ~exclusive_mask;
2240 flag |= exclusive[i];
2241
2242 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2243 EXPECT_EQ(-1, ret);
2244 EXPECT_EQ(EFAULT, errno) {
2245 TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!",
2246 flag);
2247 }
2b7ea5b5
TH		 2248 }
2249
4ee07767 2250 /* Test detection of an unknown filter flags, without exclusives. */
2b7ea5b5 2251 flag = -1;
4ee07767 2252 flag &= ~exclusive_mask;
2b7ea5b5
TH		 2253 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2254 EXPECT_EQ(-1, ret);
2255 EXPECT_EQ(EINVAL, errno) {
2256 TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!",
2257 flag);
2258 }
2259
2260 /*
2261 * Test detection of an unknown filter flag that may simply need to be
2262 * added to this test
2263 */
2264 flag = flags[ARRAY_SIZE(flags) - 1] << 1;
2265 ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL);
2266 EXPECT_EQ(-1, ret);
2267 EXPECT_EQ(EINVAL, errno) {
2268 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?",
2269 flag);
2270 }
2271}
2272
c99ee51a
KC		 2273TEST(TSYNC_first)
2274{
2275 struct sock_filter filter[] = {
2276 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2277 };
2278 struct sock_fprog prog = {
2279 .len = (unsigned short)ARRAY_SIZE(filter),
2280 .filter = filter,
2281 };
2282 long ret;
2283
2284 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0);
2285 ASSERT_EQ(0, ret) {
2286 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2287 }
2288
6c045d07 2289 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a 2290 &prog);
b623c4da
KC		 2291 ASSERT_NE(ENOSYS, errno) {
2292 TH_LOG("Kernel does not support seccomp syscall!");
2293 }
c99ee51a
KC		 2294 EXPECT_EQ(0, ret) {
2295 TH_LOG("Could not install initial filter with TSYNC!");
2296 }
2297}
2298
2299#define TSYNC_SIBLINGS 2
2300struct tsync_sibling {
2301 pthread_t tid;
2302 pid_t system_tid;
2303 sem_t *started;
2304 pthread_cond_t *cond;
2305 pthread_mutex_t *mutex;
2306 int diverge;
2307 int num_waits;
2308 struct sock_fprog *prog;
2309 struct __test_metadata *metadata;
2310};
2311
93bd70e3
KC		 2312/*
2313 * To avoid joining joined threads (which is not allowed by Bionic),
2314 * make sure we both successfully join and clear the tid to skip a
2315 * later join attempt during fixture teardown. Any remaining threads
2316 * will be directly killed during teardown.
2317 */
2318#define PTHREAD_JOIN(tid, status) \
2319 do { \
2320 int _rc = pthread_join(tid, status); \
2321 if (_rc) { \
2322 TH_LOG("pthread_join of tid %u failed: %d\n", \
2323 (unsigned int)tid, _rc); \
2324 } else { \
2325 tid = 0; \
2326 } \
2327 } while (0)
2328
1ae81d78 2329FIXTURE(TSYNC) {
c99ee51a
KC		 2330 struct sock_fprog root_prog, apply_prog;
2331 struct tsync_sibling sibling[TSYNC_SIBLINGS];
2332 sem_t started;
2333 pthread_cond_t cond;
2334 pthread_mutex_t mutex;
2335 int sibling_count;
2336};
2337
2338FIXTURE_SETUP(TSYNC)
2339{
2340 struct sock_filter root_filter[] = {
2341 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2342 };
2343 struct sock_filter apply_filter[] = {
2344 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2345 offsetof(struct seccomp_data, nr)),
2346 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1),
2347 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2348 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2349 };
2350
2351 memset(&self->root_prog, 0, sizeof(self->root_prog));
2352 memset(&self->apply_prog, 0, sizeof(self->apply_prog));
2353 memset(&self->sibling, 0, sizeof(self->sibling));
2354 self->root_prog.filter = malloc(sizeof(root_filter));
2355 ASSERT_NE(NULL, self->root_prog.filter);
2356 memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter));
2357 self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter);
2358
2359 self->apply_prog.filter = malloc(sizeof(apply_filter));
2360 ASSERT_NE(NULL, self->apply_prog.filter);
2361 memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter));
2362 self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter);
2363
2364 self->sibling_count = 0;
2365 pthread_mutex_init(&self->mutex, NULL);
2366 pthread_cond_init(&self->cond, NULL);
2367 sem_init(&self->started, 0, 0);
2368 self->sibling[0].tid = 0;
2369 self->sibling[0].cond = &self->cond;
2370 self->sibling[0].started = &self->started;
2371 self->sibling[0].mutex = &self->mutex;
2372 self->sibling[0].diverge = 0;
2373 self->sibling[0].num_waits = 1;
2374 self->sibling[0].prog = &self->root_prog;
2375 self->sibling[0].metadata = _metadata;
2376 self->sibling[1].tid = 0;
2377 self->sibling[1].cond = &self->cond;
2378 self->sibling[1].started = &self->started;
2379 self->sibling[1].mutex = &self->mutex;
2380 self->sibling[1].diverge = 0;
2381 self->sibling[1].prog = &self->root_prog;
2382 self->sibling[1].num_waits = 1;
2383 self->sibling[1].metadata = _metadata;
2384}
2385
2386FIXTURE_TEARDOWN(TSYNC)
2387{
2388 int sib = 0;
2389
2390 if (self->root_prog.filter)
2391 free(self->root_prog.filter);
2392 if (self->apply_prog.filter)
2393 free(self->apply_prog.filter);
2394
2395 for ( ; sib < self->sibling_count; ++sib) {
2396 struct tsync_sibling *s = &self->sibling[sib];
c99ee51a
KC		 2397
2398 if (!s->tid)
2399 continue;
93bd70e3
KC		 2400 /*
2401 * If a thread is still running, it may be stuck, so hit
2402 * it over the head really hard.
2403 */
2404 pthread_kill(s->tid, 9);
c99ee51a
KC		 2405 }
2406 pthread_mutex_destroy(&self->mutex);
2407 pthread_cond_destroy(&self->cond);
2408 sem_destroy(&self->started);
2409}
2410
2411void *tsync_sibling(void *data)
2412{
2413 long ret = 0;
2414 struct tsync_sibling *me = data;
2415
2416 me->system_tid = syscall(__NR_gettid);
2417
2418 pthread_mutex_lock(me->mutex);
2419 if (me->diverge) {
2420 /* Just re-apply the root prog to fork the tree */
2421 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
2422 me->prog, 0, 0);
2423 }
2424 sem_post(me->started);
2425 /* Return outside of started so parent notices failures. */
2426 if (ret) {
2427 pthread_mutex_unlock(me->mutex);
2428 return (void *)SIBLING_EXIT_FAILURE;
2429 }
2430 do {
2431 pthread_cond_wait(me->cond, me->mutex);
2432 me->num_waits = me->num_waits - 1;
2433 } while (me->num_waits);
2434 pthread_mutex_unlock(me->mutex);
2435
2436 ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0);
2437 if (!ret)
2438 return (void *)SIBLING_EXIT_NEWPRIVS;
2439 read(0, NULL, 0);
2440 return (void *)SIBLING_EXIT_UNKILLED;
2441}
2442
2443void tsync_start_sibling(struct tsync_sibling *sibling)
2444{
2445 pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling);
2446}
2447
2448TEST_F(TSYNC, siblings_fail_prctl)
2449{
2450 long ret;
2451 void *status;
2452 struct sock_filter filter[] = {
2453 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2454 offsetof(struct seccomp_data, nr)),
2455 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1),
2456 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL),
2457 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2458 };
2459 struct sock_fprog prog = {
2460 .len = (unsigned short)ARRAY_SIZE(filter),
2461 .filter = filter,
2462 };
2463
2464 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2465 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2466 }
2467
2468 /* Check prctl failure detection by requesting sib 0 diverge. */
2469 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog);
b623c4da
KC		 2470 ASSERT_NE(ENOSYS, errno) {
2471 TH_LOG("Kernel does not support seccomp syscall!");
2472 }
c99ee51a
KC		 2473 ASSERT_EQ(0, ret) {
2474 TH_LOG("setting filter failed");
2475 }
2476
2477 self->sibling[0].diverge = 1;
2478 tsync_start_sibling(&self->sibling[0]);
2479 tsync_start_sibling(&self->sibling[1]);
2480
2481 while (self->sibling_count < TSYNC_SIBLINGS) {
2482 sem_wait(&self->started);
2483 self->sibling_count++;
2484 }
2485
2486 /* Signal the threads to clean up*/
2487 pthread_mutex_lock(&self->mutex);
2488 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2489 TH_LOG("cond broadcast non-zero");
2490 }
2491 pthread_mutex_unlock(&self->mutex);
2492
2493 /* Ensure diverging sibling failed to call prctl. */
93bd70e3 2494 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2495 EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status);
93bd70e3 2496 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2497 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2498}
2499
2500TEST_F(TSYNC, two_siblings_with_ancestor)
2501{
2502 long ret;
2503 void *status;
2504
2505 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2506 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2507 }
2508
2509 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
b623c4da
KC		 2510 ASSERT_NE(ENOSYS, errno) {
2511 TH_LOG("Kernel does not support seccomp syscall!");
2512 }
c99ee51a
KC		 2513 ASSERT_EQ(0, ret) {
2514 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2515 }
2516 tsync_start_sibling(&self->sibling[0]);
2517 tsync_start_sibling(&self->sibling[1]);
2518
2519 while (self->sibling_count < TSYNC_SIBLINGS) {
2520 sem_wait(&self->started);
2521 self->sibling_count++;
2522 }
2523
6c045d07 2524 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2525 &self->apply_prog);
2526 ASSERT_EQ(0, ret) {
2527 TH_LOG("Could install filter on all threads!");
2528 }
2529 /* Tell the siblings to test the policy */
2530 pthread_mutex_lock(&self->mutex);
2531 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2532 TH_LOG("cond broadcast non-zero");
2533 }
2534 pthread_mutex_unlock(&self->mutex);
2535 /* Ensure they are both killed and don't exit cleanly. */
93bd70e3 2536 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2537 EXPECT_EQ(0x0, (long)status);
93bd70e3 2538 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2539 EXPECT_EQ(0x0, (long)status);
2540}
2541
2542TEST_F(TSYNC, two_sibling_want_nnp)
2543{
2544 void *status;
2545
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++;
2552 }
2553
2554 /* Tell the siblings to test no policy */
2555 pthread_mutex_lock(&self->mutex);
2556 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2557 TH_LOG("cond broadcast non-zero");
2558 }
2559 pthread_mutex_unlock(&self->mutex);
2560
2561 /* Ensure they are both upset about lacking nnp. */
93bd70e3 2562 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2563 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
93bd70e3 2564 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2565 EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status);
2566}
2567
2568TEST_F(TSYNC, two_siblings_with_no_filter)
2569{
2570 long ret;
2571 void *status;
2572
2573 /* start siblings before any prctl() operations */
2574 tsync_start_sibling(&self->sibling[0]);
2575 tsync_start_sibling(&self->sibling[1]);
2576 while (self->sibling_count < TSYNC_SIBLINGS) {
2577 sem_wait(&self->started);
2578 self->sibling_count++;
2579 }
2580
2581 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2582 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2583 }
2584
6c045d07 2585 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a 2586 &self->apply_prog);
b623c4da
KC		 2587 ASSERT_NE(ENOSYS, errno) {
2588 TH_LOG("Kernel does not support seccomp syscall!");
2589 }
c99ee51a
KC		 2590 ASSERT_EQ(0, ret) {
2591 TH_LOG("Could install filter on all threads!");
2592 }
2593
2594 /* Tell the siblings to test the policy */
2595 pthread_mutex_lock(&self->mutex);
2596 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2597 TH_LOG("cond broadcast non-zero");
2598 }
2599 pthread_mutex_unlock(&self->mutex);
2600
2601 /* Ensure they are both killed and don't exit cleanly. */
93bd70e3 2602 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2603 EXPECT_EQ(0x0, (long)status);
93bd70e3 2604 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2605 EXPECT_EQ(0x0, (long)status);
2606}
2607
2608TEST_F(TSYNC, two_siblings_with_one_divergence)
2609{
2610 long ret;
2611 void *status;
2612
2613 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2614 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2615 }
2616
2617 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
b623c4da
KC		 2618 ASSERT_NE(ENOSYS, errno) {
2619 TH_LOG("Kernel does not support seccomp syscall!");
2620 }
c99ee51a
KC		 2621 ASSERT_EQ(0, ret) {
2622 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2623 }
2624 self->sibling[0].diverge = 1;
2625 tsync_start_sibling(&self->sibling[0]);
2626 tsync_start_sibling(&self->sibling[1]);
2627
2628 while (self->sibling_count < TSYNC_SIBLINGS) {
2629 sem_wait(&self->started);
2630 self->sibling_count++;
2631 }
2632
6c045d07 2633 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2634 &self->apply_prog);
2635 ASSERT_EQ(self->sibling[0].system_tid, ret) {
2636 TH_LOG("Did not fail on diverged sibling.");
2637 }
2638
2639 /* Wake the threads */
2640 pthread_mutex_lock(&self->mutex);
2641 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2642 TH_LOG("cond broadcast non-zero");
2643 }
2644 pthread_mutex_unlock(&self->mutex);
2645
2646 /* Ensure they are both unkilled. */
93bd70e3 2647 PTHREAD_JOIN(self->sibling[0].tid, &status);
c99ee51a 2648 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
93bd70e3 2649 PTHREAD_JOIN(self->sibling[1].tid, &status);
c99ee51a
KC		 2650 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2651}
2652
51891498
TA		 2653TEST_F(TSYNC, two_siblings_with_one_divergence_no_tid_in_err)
2654{
2655 long ret, flags;
2656 void *status;
2657
2658 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2659 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2660 }
2661
2662 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
2663 ASSERT_NE(ENOSYS, errno) {
2664 TH_LOG("Kernel does not support seccomp syscall!");
2665 }
2666 ASSERT_EQ(0, ret) {
2667 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2668 }
2669 self->sibling[0].diverge = 1;
2670 tsync_start_sibling(&self->sibling[0]);
2671 tsync_start_sibling(&self->sibling[1]);
2672
2673 while (self->sibling_count < TSYNC_SIBLINGS) {
2674 sem_wait(&self->started);
2675 self->sibling_count++;
2676 }
2677
2678 flags = SECCOMP_FILTER_FLAG_TSYNC | \
2679 SECCOMP_FILTER_FLAG_TSYNC_ESRCH;
2680 ret = seccomp(SECCOMP_SET_MODE_FILTER, flags, &self->apply_prog);
2681 ASSERT_EQ(ESRCH, errno) {
2682 TH_LOG("Did not return ESRCH for diverged sibling.");
2683 }
2684 ASSERT_EQ(-1, ret) {
2685 TH_LOG("Did not fail on diverged sibling.");
2686 }
2687
2688 /* Wake the threads */
2689 pthread_mutex_lock(&self->mutex);
2690 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2691 TH_LOG("cond broadcast non-zero");
2692 }
2693 pthread_mutex_unlock(&self->mutex);
2694
2695 /* Ensure they are both unkilled. */
2696 PTHREAD_JOIN(self->sibling[0].tid, &status);
2697 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2698 PTHREAD_JOIN(self->sibling[1].tid, &status);
2699 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2700}
2701
c99ee51a
KC		 2702TEST_F(TSYNC, two_siblings_not_under_filter)
2703{
2704 long ret, sib;
2705 void *status;
ed492c2a 2706 struct timespec delay = { .tv_nsec = 100000000 };
c99ee51a
KC		 2707
2708 ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2709 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2710 }
2711
2712 /*
2713 * Sibling 0 will have its own seccomp policy
2714 * and Sibling 1 will not be under seccomp at
2715 * all. Sibling 1 will enter seccomp and 0
2716 * will cause failure.
2717 */
2718 self->sibling[0].diverge = 1;
2719 tsync_start_sibling(&self->sibling[0]);
2720 tsync_start_sibling(&self->sibling[1]);
2721
2722 while (self->sibling_count < TSYNC_SIBLINGS) {
2723 sem_wait(&self->started);
2724 self->sibling_count++;
2725 }
2726
2727 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog);
b623c4da
KC		 2728 ASSERT_NE(ENOSYS, errno) {
2729 TH_LOG("Kernel does not support seccomp syscall!");
2730 }
c99ee51a
KC		 2731 ASSERT_EQ(0, ret) {
2732 TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!");
2733 }
2734
6c045d07 2735 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2736 &self->apply_prog);
2737 ASSERT_EQ(ret, self->sibling[0].system_tid) {
2738 TH_LOG("Did not fail on diverged sibling.");
2739 }
2740 sib = 1;
2741 if (ret == self->sibling[0].system_tid)
2742 sib = 0;
2743
2744 pthread_mutex_lock(&self->mutex);
2745
2746 /* Increment the other siblings num_waits so we can clean up
2747 * the one we just saw.
2748 */
2749 self->sibling[!sib].num_waits += 1;
2750
2751 /* Signal the thread to clean up*/
2752 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2753 TH_LOG("cond broadcast non-zero");
2754 }
2755 pthread_mutex_unlock(&self->mutex);
93bd70e3 2756 PTHREAD_JOIN(self->sibling[sib].tid, &status);
c99ee51a
KC		 2757 EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status);
2758 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2759 while (!kill(self->sibling[sib].system_tid, 0))
ed492c2a 2760 nanosleep(&delay, NULL);
c99ee51a
KC		 2761 /* Switch to the remaining sibling */
2762 sib = !sib;
2763
6c045d07 2764 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2765 &self->apply_prog);
2766 ASSERT_EQ(0, ret) {
2767 TH_LOG("Expected the remaining sibling to sync");
2768 };
2769
2770 pthread_mutex_lock(&self->mutex);
2771
2772 /* If remaining sibling didn't have a chance to wake up during
2773 * the first broadcast, manually reduce the num_waits now.
2774 */
2775 if (self->sibling[sib].num_waits > 1)
2776 self->sibling[sib].num_waits = 1;
2777 ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) {
2778 TH_LOG("cond broadcast non-zero");
2779 }
2780 pthread_mutex_unlock(&self->mutex);
93bd70e3 2781 PTHREAD_JOIN(self->sibling[sib].tid, &status);
c99ee51a
KC		 2782 EXPECT_EQ(0, (long)status);
2783 /* Poll for actual task death. pthread_join doesn't guarantee it. */
2784 while (!kill(self->sibling[sib].system_tid, 0))
ed492c2a 2785 nanosleep(&delay, NULL);
c99ee51a 2786
6c045d07 2787 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC,
c99ee51a
KC		 2788 &self->apply_prog);
2789 ASSERT_EQ(0, ret); /* just us chickens */
2790}
2791
2792/* Make sure restarted syscalls are seen directly as "restart_syscall". */
2793TEST(syscall_restart)
2794{
2795 long ret;
2796 unsigned long msg;
2797 pid_t child_pid;
2798 int pipefd[2];
2799 int status;
2800 siginfo_t info = { };
2801 struct sock_filter filter[] = {
2802 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2803 offsetof(struct seccomp_data, nr)),
2804
2805#ifdef __NR_sigreturn
d42b8dbe 2806 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 7, 0),
c99ee51a 2807#endif
d42b8dbe
TLSC		 2808 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 6, 0),
2809 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 5, 0),
2810 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 4, 0),
2811 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 5, 0),
2812 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_clock_nanosleep, 4, 0),
c99ee51a
KC		 2813 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0),
2814
2815 /* Allow __NR_write for easy logging. */
2816 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1),
2817 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2818 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
256d0afb
KC		 2819 /* The nanosleep jump target. */
2820 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100),
2821 /* The restart_syscall jump target. */
2822 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200),
c99ee51a
KC		 2823 };
2824 struct sock_fprog prog = {
2825 .len = (unsigned short)ARRAY_SIZE(filter),
2826 .filter = filter,
2827 };
256d0afb
KC		 2828#if defined(__arm__)
2829 struct utsname utsbuf;
2830#endif
c99ee51a
KC		 2831
2832 ASSERT_EQ(0, pipe(pipefd));
2833
2834 child_pid = fork();
2835 ASSERT_LE(0, child_pid);
2836 if (child_pid == 0) {
2837 /* Child uses EXPECT not ASSERT to deliver status correctly. */
2838 char buf = ' ';
256d0afb 2839 struct timespec timeout = { };
c99ee51a
KC		 2840
2841 /* Attach parent as tracer and stop. */
2842 EXPECT_EQ(0, ptrace(PTRACE_TRACEME));
2843 EXPECT_EQ(0, raise(SIGSTOP));
2844
2845 EXPECT_EQ(0, close(pipefd[1]));
2846
2847 EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) {
2848 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
2849 }
2850
2851 ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0);
2852 EXPECT_EQ(0, ret) {
2853 TH_LOG("Failed to install filter!");
2854 }
2855
2856 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2857 TH_LOG("Failed to read() sync from parent");
2858 }
2859 EXPECT_EQ('.', buf) {
2860 TH_LOG("Failed to get sync data from read()");
2861 }
2862
256d0afb
KC		 2863 /* Start nanosleep to be interrupted. */
2864 timeout.tv_sec = 1;
c99ee51a 2865 errno = 0;
256d0afb
KC		 2866 EXPECT_EQ(0, nanosleep(&timeout, NULL)) {
2867 TH_LOG("Call to nanosleep() failed (errno %d)", errno);
c99ee51a
KC		 2868 }
2869
2870 /* Read final sync from parent. */
2871 EXPECT_EQ(1, read(pipefd[0], &buf, 1)) {
2872 TH_LOG("Failed final read() from parent");
2873 }
2874 EXPECT_EQ('!', buf) {
2875 TH_LOG("Failed to get final data from read()");
2876 }
2877
2878 /* Directly report the status of our test harness results. */
2879 syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS
2880 : EXIT_FAILURE);
2881 }
2882 EXPECT_EQ(0, close(pipefd[0]));
2883
2884 /* Attach to child, setup options, and release. */
2885 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2886 ASSERT_EQ(true, WIFSTOPPED(status));
2887 ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL,
2888 PTRACE_O_TRACESECCOMP));
2889 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2890 ASSERT_EQ(1, write(pipefd[1], ".", 1));
2891
256d0afb 2892 /* Wait for nanosleep() to start. */
c99ee51a
KC		 2893 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2894 ASSERT_EQ(true, WIFSTOPPED(status));
2895 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2896 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2897 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
2898 ASSERT_EQ(0x100, msg);
d42b8dbe
TLSC		 2899 ret = get_syscall(_metadata, child_pid);
2900 EXPECT_TRUE(ret == __NR_nanosleep || ret == __NR_clock_nanosleep);
c99ee51a
KC		 2901
2902 /* Might as well check siginfo for sanity while we're here. */
2903 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2904 ASSERT_EQ(SIGTRAP, info.si_signo);
2905 ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code);
2906 EXPECT_EQ(0, info.si_errno);
2907 EXPECT_EQ(getuid(), info.si_uid);
2908 /* Verify signal delivery came from child (seccomp-triggered). */
2909 EXPECT_EQ(child_pid, info.si_pid);
2910
256d0afb 2911 /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */
c99ee51a
KC		 2912 ASSERT_EQ(0, kill(child_pid, SIGSTOP));
2913 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2914 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2915 ASSERT_EQ(true, WIFSTOPPED(status));
2916 ASSERT_EQ(SIGSTOP, WSTOPSIG(status));
c99ee51a 2917 ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info));
2bd61abe
KC		 2918 /*
2919 * There is no siginfo on SIGSTOP any more, so we can't verify
2920 * signal delivery came from parent now (getpid() == info.si_pid).
2921 * https://lkml.kernel.org/r/CAGXu5jJaZAOzP1qFz66tYrtbuywqb+UN2SOA1VLHpCCOiYvYeg@mail.gmail.com
2922 * At least verify the SIGSTOP via PTRACE_GETSIGINFO.
2923 */
2924 EXPECT_EQ(SIGSTOP, info.si_signo);
c99ee51a 2925
256d0afb 2926 /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */
c99ee51a
KC		 2927 ASSERT_EQ(0, kill(child_pid, SIGCONT));
2928 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2929 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2930 ASSERT_EQ(true, WIFSTOPPED(status));
2931 ASSERT_EQ(SIGCONT, WSTOPSIG(status));
2932 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2933
2934 /* Wait for restart_syscall() to start. */
2935 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2936 ASSERT_EQ(true, WIFSTOPPED(status));
2937 ASSERT_EQ(SIGTRAP, WSTOPSIG(status));
2938 ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16));
2939 ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg));
256d0afb 2940
c99ee51a
KC		 2941 ASSERT_EQ(0x200, msg);
2942 ret = get_syscall(_metadata, child_pid);
2943#if defined(__arm__)
256d0afb
KC		 2944 /*
2945 * FIXME:
2946 * - native ARM registers do NOT expose true syscall.
2947 * - compat ARM registers on ARM64 DO expose true syscall.
2948 */
2949 ASSERT_EQ(0, uname(&utsbuf));
2950 if (strncmp(utsbuf.machine, "arm", 3) == 0) {
2951 EXPECT_EQ(__NR_nanosleep, ret);
2952 } else
c99ee51a 2953#endif
256d0afb
KC		 2954 {
2955 EXPECT_EQ(__NR_restart_syscall, ret);
2956 }
c99ee51a 2957
256d0afb 2958 /* Write again to end test. */
c99ee51a
KC		 2959 ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0));
2960 ASSERT_EQ(1, write(pipefd[1], "!", 1));
2961 EXPECT_EQ(0, close(pipefd[1]));
2962
2963 ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0));
2964 if (WIFSIGNALED(status) || WEXITSTATUS(status))
2965 _metadata->passed = 0;
2966}
2967
e66a3997
TH		 2968TEST_SIGNAL(filter_flag_log, SIGSYS)
2969{
2970 struct sock_filter allow_filter[] = {
2971 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2972 };
2973 struct sock_filter kill_filter[] = {
2974 BPF_STMT(BPF_LD|BPF_W|BPF_ABS,
2975 offsetof(struct seccomp_data, nr)),
2976 BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1),
2977 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),
2978 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
2979 };
2980 struct sock_fprog allow_prog = {
2981 .len = (unsigned short)ARRAY_SIZE(allow_filter),
2982 .filter = allow_filter,
2983 };
2984 struct sock_fprog kill_prog = {
2985 .len = (unsigned short)ARRAY_SIZE(kill_filter),
2986 .filter = kill_filter,
2987 };
2988 long ret;
2989 pid_t parent = getppid();
2990
2991 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
2992 ASSERT_EQ(0, ret);
2993
2994 /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */
2995 ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG,
2996 &allow_prog);
2997 ASSERT_NE(ENOSYS, errno) {
2998 TH_LOG("Kernel does not support seccomp syscall!");
2999 }
3000 EXPECT_NE(0, ret) {
3001 TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!");
3002 }
3003 EXPECT_EQ(EINVAL, errno) {
3004 TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!");
3005 }
3006
3007 /* Verify that a simple, permissive filter can be added with no flags */
3008 ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog);
3009 EXPECT_EQ(0, ret);
3010
3011 /* See if the same filter can be added with the FILTER_FLAG_LOG flag */
3012 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
3013 &allow_prog);
3014 ASSERT_NE(EINVAL, errno) {
3015 TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!");
3016 }
3017 EXPECT_EQ(0, ret);
3018
3019 /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */
3020 ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG,
3021 &kill_prog);
3022 EXPECT_EQ(0, ret);
3023
3024 EXPECT_EQ(parent, syscall(__NR_getppid));
3025 /* getpid() should never return. */
3026 EXPECT_EQ(0, syscall(__NR_getpid));
3027}
3028
d612b1fd
TH		 3029TEST(get_action_avail)
3030{
fd76875c 3031 __u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP,
d612b1fd 3032 SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE,
59f5cf44 3033 SECCOMP_RET_LOG, SECCOMP_RET_ALLOW };
d612b1fd
TH		 3034 __u32 unknown_action = 0x10000000U;
3035 int i;
3036 long ret;
3037
3038 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]);
3039 ASSERT_NE(ENOSYS, errno) {
3040 TH_LOG("Kernel does not support seccomp syscall!");
3041 }
3042 ASSERT_NE(EINVAL, errno) {
3043 TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!");
3044 }
3045 EXPECT_EQ(ret, 0);
3046
3047 for (i = 0; i < ARRAY_SIZE(actions); i++) {
3048 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]);
3049 EXPECT_EQ(ret, 0) {
3050 TH_LOG("Expected action (0x%X) not available!",
3051 actions[i]);
3052 }
3053 }
3054
3055 /* Check that an unknown action is handled properly (EOPNOTSUPP) */
3056 ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action);
3057 EXPECT_EQ(ret, -1);
3058 EXPECT_EQ(errno, EOPNOTSUPP);
3059}
3060
d057dc4e
TA		 3061TEST(get_metadata)
3062{
3063 pid_t pid;
3064 int pipefd[2];
3065 char buf;
3066 struct seccomp_metadata md;
6c3b6d50 3067 long ret;
d057dc4e 3068
3aa415dd
TA		 3069 /* Only real root can get metadata. */
3070 if (geteuid()) {
3071 XFAIL(return, "get_metadata requires real root");
3072 return;
3073 }
3074
d057dc4e
TA		 3075 ASSERT_EQ(0, pipe(pipefd));
3076
3077 pid = fork();
3078 ASSERT_GE(pid, 0);
3079 if (pid == 0) {
3080 struct sock_filter filter[] = {
3081 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
3082 };
3083 struct sock_fprog prog = {
3084 .len = (unsigned short)ARRAY_SIZE(filter),
3085 .filter = filter,
3086 };
3087
3088 /* one with log, one without */
fb024a07 3089 EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER,
d057dc4e 3090 SECCOMP_FILTER_FLAG_LOG, &prog));
fb024a07 3091 EXPECT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog));
d057dc4e 3092
fb024a07 3093 EXPECT_EQ(0, close(pipefd[0]));
d057dc4e
TA		 3094 ASSERT_EQ(1, write(pipefd[1], "1", 1));
3095 ASSERT_EQ(0, close(pipefd[1]));
3096
3097 while (1)
3098 sleep(100);
3099 }
3100
3101 ASSERT_EQ(0, close(pipefd[1]));
3102 ASSERT_EQ(1, read(pipefd[0], &buf, 1));
3103
3104 ASSERT_EQ(0, ptrace(PTRACE_ATTACH, pid));
3105 ASSERT_EQ(pid, waitpid(pid, NULL, 0));
3106
6c3b6d50
KC		 3107 /* Past here must not use ASSERT or child process is never killed. */
3108
d057dc4e 3109 md.filter_off = 0;
6c3b6d50
KC		 3110 errno = 0;
3111 ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
3112 EXPECT_EQ(sizeof(md), ret) {
3113 if (errno == EINVAL)
3114 XFAIL(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)");
3115 }
3116
d057dc4e
TA		 3117 EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG);
3118 EXPECT_EQ(md.filter_off, 0);
3119
3120 md.filter_off = 1;
6c3b6d50
KC		 3121 ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md);
3122 EXPECT_EQ(sizeof(md), ret);
d057dc4e
TA		 3123 EXPECT_EQ(md.flags, 0);
3124 EXPECT_EQ(md.filter_off, 1);
3125
6c3b6d50 3126skip:
d057dc4e
TA		 3127 ASSERT_EQ(0, kill(pid, SIGKILL));
3128}
3129
6a21cc50
TA		 3130static int user_trap_syscall(int nr, unsigned int flags)
3131{
3132 struct sock_filter filter[] = {
3133 BPF_STMT(BPF_LD+BPF_W+BPF_ABS,
3134 offsetof(struct seccomp_data, nr)),
3135 BPF_JUMP(BPF_JMP+BPF_JEQ+BPF_K, nr, 0, 1),
3136 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_USER_NOTIF),
3137 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
3138 };
3139
3140 struct sock_fprog prog = {
3141 .len = (unsigned short)ARRAY_SIZE(filter),
3142 .filter = filter,
3143 };
3144
3145 return seccomp(SECCOMP_SET_MODE_FILTER, flags, &prog);
3146}
3147
223e660b 3148#define USER_NOTIF_MAGIC INT_MAX
6a21cc50
TA		 3149TEST(user_notification_basic)
3150{
3151 pid_t pid;
3152 long ret;
3153 int status, listener;
3154 struct seccomp_notif req = {};
3155 struct seccomp_notif_resp resp = {};
3156 struct pollfd pollfd;
3157
3158 struct sock_filter filter[] = {
3159 BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),
3160 };
3161 struct sock_fprog prog = {
3162 .len = (unsigned short)ARRAY_SIZE(filter),
3163 .filter = filter,
3164 };
3165
c7140706
TA		 3166 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3167 ASSERT_EQ(0, ret) {
3168 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3169 }
3170
6a21cc50
TA		 3171 pid = fork();
3172 ASSERT_GE(pid, 0);
3173
3174 /* Check that we get -ENOSYS with no listener attached */
3175 if (pid == 0) {
9dd3fcb0 3176 if (user_trap_syscall(__NR_getppid, 0) < 0)
6a21cc50 3177 exit(1);
9dd3fcb0 3178 ret = syscall(__NR_getppid);
6a21cc50
TA		 3179 exit(ret >= 0 || errno != ENOSYS);
3180 }
3181
3182 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3183 EXPECT_EQ(true, WIFEXITED(status));
3184 EXPECT_EQ(0, WEXITSTATUS(status));
3185
0b54b443 3186 /* Add some no-op filters for grins. */
6a21cc50
TA		 3187 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3188 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3189 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3190 EXPECT_EQ(seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog), 0);
3191
3192 /* Check that the basic notification machinery works */
9dd3fcb0 3193 listener = user_trap_syscall(__NR_getppid,
6a21cc50 3194 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3d244c19 3195 ASSERT_GE(listener, 0);
6a21cc50
TA		 3196
3197 /* Installing a second listener in the chain should EBUSY */
9dd3fcb0 3198 EXPECT_EQ(user_trap_syscall(__NR_getppid,
6a21cc50
TA		 3199 SECCOMP_FILTER_FLAG_NEW_LISTENER),
3200 -1);
3201 EXPECT_EQ(errno, EBUSY);
3202
3203 pid = fork();
3204 ASSERT_GE(pid, 0);
3205
3206 if (pid == 0) {
9dd3fcb0 3207 ret = syscall(__NR_getppid);
6a21cc50
TA		 3208 exit(ret != USER_NOTIF_MAGIC);
3209 }
3210
3211 pollfd.fd = listener;
3212 pollfd.events = POLLIN | POLLOUT;
3213
3214 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3215 EXPECT_EQ(pollfd.revents, POLLIN);
3216
e4ab5ccc
SD		 3217 /* Test that we can't pass garbage to the kernel. */
3218 memset(&req, 0, sizeof(req));
3219 req.pid = -1;
3220 errno = 0;
3221 ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req);
3222 EXPECT_EQ(-1, ret);
3223 EXPECT_EQ(EINVAL, errno);
3224
3225 if (ret) {
3226 req.pid = 0;
3227 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3228 }
6a21cc50
TA		 3229
3230 pollfd.fd = listener;
3231 pollfd.events = POLLIN | POLLOUT;
3232
3233 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3234 EXPECT_EQ(pollfd.revents, POLLOUT);
3235
9dd3fcb0 3236 EXPECT_EQ(req.data.nr, __NR_getppid);
6a21cc50
TA		 3237
3238 resp.id = req.id;
3239 resp.error = 0;
3240 resp.val = USER_NOTIF_MAGIC;
3241
3242 /* check that we make sure flags == 0 */
3243 resp.flags = 1;
3244 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3245 EXPECT_EQ(errno, EINVAL);
3246
3247 resp.flags = 0;
3248 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3249
3250 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3251 EXPECT_EQ(true, WIFEXITED(status));
3252 EXPECT_EQ(0, WEXITSTATUS(status));
3253}
3254
51891498
TA		 3255TEST(user_notification_with_tsync)
3256{
3257 int ret;
3258 unsigned int flags;
3259
3260 /* these were exclusive */
3261 flags = SECCOMP_FILTER_FLAG_NEW_LISTENER |
3262 SECCOMP_FILTER_FLAG_TSYNC;
3263 ASSERT_EQ(-1, user_trap_syscall(__NR_getppid, flags));
3264 ASSERT_EQ(EINVAL, errno);
3265
3266 /* but now they're not */
3267 flags |= SECCOMP_FILTER_FLAG_TSYNC_ESRCH;
3268 ret = user_trap_syscall(__NR_getppid, flags);
3269 close(ret);
3270 ASSERT_LE(0, ret);
3271}
3272
6a21cc50
TA		 3273TEST(user_notification_kill_in_middle)
3274{
3275 pid_t pid;
3276 long ret;
3277 int listener;
3278 struct seccomp_notif req = {};
3279 struct seccomp_notif_resp resp = {};
3280
c7140706
TA		 3281 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3282 ASSERT_EQ(0, ret) {
3283 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3284 }
3285
9dd3fcb0 3286 listener = user_trap_syscall(__NR_getppid,
6a21cc50 3287 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3d244c19 3288 ASSERT_GE(listener, 0);
6a21cc50
TA		 3289
3290 /*
3291 * Check that nothing bad happens when we kill the task in the middle
3292 * of a syscall.
3293 */
3294 pid = fork();
3295 ASSERT_GE(pid, 0);
3296
3297 if (pid == 0) {
9dd3fcb0 3298 ret = syscall(__NR_getppid);
6a21cc50
TA		 3299 exit(ret != USER_NOTIF_MAGIC);
3300 }
3301
3302 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3303 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), 0);
3304
3305 EXPECT_EQ(kill(pid, SIGKILL), 0);
3306 EXPECT_EQ(waitpid(pid, NULL, 0), pid);
3307
3308 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_ID_VALID, &req.id), -1);
3309
3310 resp.id = req.id;
3311 ret = ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp);
3312 EXPECT_EQ(ret, -1);
3313 EXPECT_EQ(errno, ENOENT);
3314}
3315
3316static int handled = -1;
3317
3318static void signal_handler(int signal)
3319{
3320 if (write(handled, "c", 1) != 1)
3321 perror("write from signal");
3322}
3323
3324TEST(user_notification_signal)
3325{
3326 pid_t pid;
3327 long ret;
3328 int status, listener, sk_pair[2];
3329 struct seccomp_notif req = {};
3330 struct seccomp_notif_resp resp = {};
3331 char c;
3332
c7140706
TA		 3333 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3334 ASSERT_EQ(0, ret) {
3335 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3336 }
3337
6a21cc50
TA		 3338 ASSERT_EQ(socketpair(PF_LOCAL, SOCK_SEQPACKET, 0, sk_pair), 0);
3339
3340 listener = user_trap_syscall(__NR_gettid,
3341 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3d244c19 3342 ASSERT_GE(listener, 0);
6a21cc50
TA		 3343
3344 pid = fork();
3345 ASSERT_GE(pid, 0);
3346
3347 if (pid == 0) {
3348 close(sk_pair[0]);
3349 handled = sk_pair[1];
3350 if (signal(SIGUSR1, signal_handler) == SIG_ERR) {
3351 perror("signal");
3352 exit(1);
3353 }
3354 /*
3355 * ERESTARTSYS behavior is a bit hard to test, because we need
3356 * to rely on a signal that has not yet been handled. Let's at
3357 * least check that the error code gets propagated through, and
3358 * hope that it doesn't break when there is actually a signal :)
3359 */
3360 ret = syscall(__NR_gettid);
3361 exit(!(ret == -1 && errno == 512));
3362 }
3363
3364 close(sk_pair[1]);
3365
88c13f8b 3366 memset(&req, 0, sizeof(req));
6a21cc50
TA		 3367 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3368
3369 EXPECT_EQ(kill(pid, SIGUSR1), 0);
3370
3371 /*
3372 * Make sure the signal really is delivered, which means we're not
3373 * stuck in the user notification code any more and the notification
3374 * should be dead.
3375 */
3376 EXPECT_EQ(read(sk_pair[0], &c, 1), 1);
3377
3378 resp.id = req.id;
3379 resp.error = -EPERM;
3380 resp.val = 0;
3381
3382 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3383 EXPECT_EQ(errno, ENOENT);
3384
88c13f8b 3385 memset(&req, 0, sizeof(req));
6a21cc50
TA		 3386 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3387
3388 resp.id = req.id;
3389 resp.error = -512; /* -ERESTARTSYS */
3390 resp.val = 0;
3391
3392 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3393
3394 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3395 EXPECT_EQ(true, WIFEXITED(status));
3396 EXPECT_EQ(0, WEXITSTATUS(status));
3397}
3398
3399TEST(user_notification_closed_listener)
3400{
3401 pid_t pid;
3402 long ret;
3403 int status, listener;
3404
c7140706
TA		 3405 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3406 ASSERT_EQ(0, ret) {
3407 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3408 }
3409
9dd3fcb0 3410 listener = user_trap_syscall(__NR_getppid,
6a21cc50 3411 SECCOMP_FILTER_FLAG_NEW_LISTENER);
3d244c19 3412 ASSERT_GE(listener, 0);
6a21cc50
TA		 3413
3414 /*
3415 * Check that we get an ENOSYS when the listener is closed.
3416 */
3417 pid = fork();
3418 ASSERT_GE(pid, 0);
3419 if (pid == 0) {
3420 close(listener);
9dd3fcb0 3421 ret = syscall(__NR_getppid);
6a21cc50
TA		 3422 exit(ret != -1 && errno != ENOSYS);
3423 }
3424
3425 close(listener);
3426
3427 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3428 EXPECT_EQ(true, WIFEXITED(status));
3429 EXPECT_EQ(0, WEXITSTATUS(status));
3430}
3431
3432/*
3433 * Check that a pid in a child namespace still shows up as valid in ours.
3434 */
3435TEST(user_notification_child_pid_ns)
3436{
3437 pid_t pid;
3438 int status, listener;
3439 struct seccomp_notif req = {};
3440 struct seccomp_notif_resp resp = {};
3441
30d53a58 3442 ASSERT_EQ(unshare(CLONE_NEWUSER | CLONE_NEWPID), 0);
6a21cc50 3443
9dd3fcb0
KC		 3444 listener = user_trap_syscall(__NR_getppid,
3445 SECCOMP_FILTER_FLAG_NEW_LISTENER);
6a21cc50
TA		 3446 ASSERT_GE(listener, 0);
3447
3448 pid = fork();
3449 ASSERT_GE(pid, 0);
3450
3451 if (pid == 0)
9dd3fcb0 3452 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
6a21cc50
TA		 3453
3454 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3455 EXPECT_EQ(req.pid, pid);
3456
3457 resp.id = req.id;
3458 resp.error = 0;
3459 resp.val = USER_NOTIF_MAGIC;
3460
3461 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3462
3463 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3464 EXPECT_EQ(true, WIFEXITED(status));
3465 EXPECT_EQ(0, WEXITSTATUS(status));
3466 close(listener);
3467}
3468
3469/*
3470 * Check that a pid in a sibling (i.e. unrelated) namespace shows up as 0, i.e.
3471 * invalid.
3472 */
3473TEST(user_notification_sibling_pid_ns)
3474{
3475 pid_t pid, pid2;
3476 int status, listener;
3477 struct seccomp_notif req = {};
3478 struct seccomp_notif_resp resp = {};
3479
c7140706
TA		 3480 ASSERT_EQ(prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0), 0) {
3481 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3482 }
3483
9dd3fcb0
KC		 3484 listener = user_trap_syscall(__NR_getppid,
3485 SECCOMP_FILTER_FLAG_NEW_LISTENER);
6a21cc50
TA		 3486 ASSERT_GE(listener, 0);
3487
3488 pid = fork();
3489 ASSERT_GE(pid, 0);
3490
3491 if (pid == 0) {
3492 ASSERT_EQ(unshare(CLONE_NEWPID), 0);
3493
3494 pid2 = fork();
3495 ASSERT_GE(pid2, 0);
3496
3497 if (pid2 == 0)
9dd3fcb0 3498 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
6a21cc50
TA		 3499
3500 EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
3501 EXPECT_EQ(true, WIFEXITED(status));
3502 EXPECT_EQ(0, WEXITSTATUS(status));
3503 exit(WEXITSTATUS(status));
3504 }
3505
3506 /* Create the sibling ns, and sibling in it. */
9dd3fcb0
KC		 3507 ASSERT_EQ(unshare(CLONE_NEWPID), 0);
3508 ASSERT_EQ(errno, 0);
6a21cc50
TA		 3509
3510 pid2 = fork();
9dd3fcb0 3511 ASSERT_GE(pid2, 0);
6a21cc50
TA		 3512
3513 if (pid2 == 0) {
3514 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3515 /*
3516 * The pid should be 0, i.e. the task is in some namespace that
3517 * we can't "see".
3518 */
9dd3fcb0 3519 EXPECT_EQ(req.pid, 0);
6a21cc50
TA		 3520
3521 resp.id = req.id;
3522 resp.error = 0;
3523 resp.val = USER_NOTIF_MAGIC;
3524
3525 ASSERT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3526 exit(0);
3527 }
3528
3529 close(listener);
3530
3531 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3532 EXPECT_EQ(true, WIFEXITED(status));
3533 EXPECT_EQ(0, WEXITSTATUS(status));
3534
3535 EXPECT_EQ(waitpid(pid2, &status, 0), pid2);
3536 EXPECT_EQ(true, WIFEXITED(status));
3537 EXPECT_EQ(0, WEXITSTATUS(status));
3538}
3539
3540TEST(user_notification_fault_recv)
3541{
3542 pid_t pid;
3543 int status, listener;
3544 struct seccomp_notif req = {};
3545 struct seccomp_notif_resp resp = {};
3546
30d53a58
TA		 3547 ASSERT_EQ(unshare(CLONE_NEWUSER), 0);
3548
9dd3fcb0
KC		 3549 listener = user_trap_syscall(__NR_getppid,
3550 SECCOMP_FILTER_FLAG_NEW_LISTENER);
6a21cc50
TA		 3551 ASSERT_GE(listener, 0);
3552
3553 pid = fork();
3554 ASSERT_GE(pid, 0);
3555
3556 if (pid == 0)
9dd3fcb0 3557 exit(syscall(__NR_getppid) != USER_NOTIF_MAGIC);
6a21cc50
TA		 3558
3559 /* Do a bad recv() */
3560 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, NULL), -1);
3561 EXPECT_EQ(errno, EFAULT);
3562
3563 /* We should still be able to receive this notification, though. */
3564 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3565 EXPECT_EQ(req.pid, pid);
3566
3567 resp.id = req.id;
3568 resp.error = 0;
3569 resp.val = USER_NOTIF_MAGIC;
3570
3571 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0);
3572
3573 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3574 EXPECT_EQ(true, WIFEXITED(status));
3575 EXPECT_EQ(0, WEXITSTATUS(status));
3576}
3577
3578TEST(seccomp_get_notif_sizes)
3579{
3580 struct seccomp_notif_sizes sizes;
3581
3d244c19 3582 ASSERT_EQ(seccomp(SECCOMP_GET_NOTIF_SIZES, 0, &sizes), 0);
6a21cc50
TA		 3583 EXPECT_EQ(sizes.seccomp_notif, sizeof(struct seccomp_notif));
3584 EXPECT_EQ(sizes.seccomp_notif_resp, sizeof(struct seccomp_notif_resp));
3585}
3586
0eebfed2
CB		 3587static int filecmp(pid_t pid1, pid_t pid2, int fd1, int fd2)
3588{
3589#ifdef __NR_kcmp
3590 return syscall(__NR_kcmp, pid1, pid2, KCMP_FILE, fd1, fd2);
3591#else
3592 errno = ENOSYS;
3593 return -1;
3594#endif
3595}
3596
3597TEST(user_notification_continue)
3598{
3599 pid_t pid;
3600 long ret;
3601 int status, listener;
3602 struct seccomp_notif req = {};
3603 struct seccomp_notif_resp resp = {};
3604 struct pollfd pollfd;
3605
3606 ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
3607 ASSERT_EQ(0, ret) {
3608 TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!");
3609 }
3610
3611 listener = user_trap_syscall(__NR_dup, SECCOMP_FILTER_FLAG_NEW_LISTENER);
3612 ASSERT_GE(listener, 0);
3613
3614 pid = fork();
3615 ASSERT_GE(pid, 0);
3616
3617 if (pid == 0) {
3618 int dup_fd, pipe_fds[2];
3619 pid_t self;
3620
3621 ret = pipe(pipe_fds);
3622 if (ret < 0)
3623 exit(1);
3624
3625 dup_fd = dup(pipe_fds[0]);
3626 if (dup_fd < 0)
3627 exit(1);
3628
3629 self = getpid();
3630
3631 ret = filecmp(self, self, pipe_fds[0], dup_fd);
3632 if (ret)
3633 exit(2);
3634
3635 exit(0);
3636 }
3637
3638 pollfd.fd = listener;
3639 pollfd.events = POLLIN | POLLOUT;
3640
3641 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3642 EXPECT_EQ(pollfd.revents, POLLIN);
3643
3644 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_RECV, &req), 0);
3645
3646 pollfd.fd = listener;
3647 pollfd.events = POLLIN | POLLOUT;
3648
3649 EXPECT_GT(poll(&pollfd, 1, -1), 0);
3650 EXPECT_EQ(pollfd.revents, POLLOUT);
3651
3652 EXPECT_EQ(req.data.nr, __NR_dup);
3653
3654 resp.id = req.id;
3655 resp.flags = SECCOMP_USER_NOTIF_FLAG_CONTINUE;
3656
3657 /*
3658 * Verify that setting SECCOMP_USER_NOTIF_FLAG_CONTINUE enforces other
3659 * args be set to 0.
3660 */
3661 resp.error = 0;
3662 resp.val = USER_NOTIF_MAGIC;
3663 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3664 EXPECT_EQ(errno, EINVAL);
3665
3666 resp.error = USER_NOTIF_MAGIC;
3667 resp.val = 0;
3668 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), -1);
3669 EXPECT_EQ(errno, EINVAL);
3670
3671 resp.error = 0;
3672 resp.val = 0;
3673 EXPECT_EQ(ioctl(listener, SECCOMP_IOCTL_NOTIF_SEND, &resp), 0) {
3674 if (errno == EINVAL)
3675 XFAIL(goto skip, "Kernel does not support SECCOMP_USER_NOTIF_FLAG_CONTINUE");
3676 }
3677
3678skip:
3679 EXPECT_EQ(waitpid(pid, &status, 0), pid);
3680 EXPECT_EQ(true, WIFEXITED(status));
3681 EXPECT_EQ(0, WEXITSTATUS(status)) {
3682 if (WEXITSTATUS(status) == 2) {
3683 XFAIL(return, "Kernel does not support kcmp() syscall");
3684 return;
3685 }
3686 }
3687}
3688
c99ee51a
KC		 3689/*
3690 * TODO:
3691 * - add microbenchmarks
3692 * - expand NNP testing
3693 * - better arch-specific TRACE and TRAP handlers.
3694 * - endianness checking when appropriate
3695 * - 64-bit arg prodding
3696 * - arch value testing (x86 modes especially)
e66a3997 3697 * - verify that FILTER_FLAG_LOG filters generate log messages
59f5cf44 3698 * - verify that RET_LOG generates log messages
c99ee51a
KC		 3699 * - ...
3700 */
3701
3702TEST_HARNESS_MAIN
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