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c99ee51a KC |
1 | /* |
2 | * Copyright (c) 2012 The Chromium OS Authors. All rights reserved. | |
3 | * Use of this source code is governed by the GPLv2 license. | |
4 | * | |
5 | * Test code for seccomp bpf. | |
6 | */ | |
7 | ||
0ce105bf | 8 | #include <sys/types.h> |
10859f38 KC |
9 | |
10 | /* | |
11 | * glibc 2.26 and later have SIGSYS in siginfo_t. Before that, | |
12 | * we need to use the kernel's siginfo.h file and trick glibc | |
13 | * into accepting it. | |
14 | */ | |
15 | #if !__GLIBC_PREREQ(2, 26) | |
16 | # include <asm/siginfo.h> | |
17 | # define __have_siginfo_t 1 | |
18 | # define __have_sigval_t 1 | |
19 | # define __have_sigevent_t 1 | |
20 | #endif | |
c99ee51a KC |
21 | |
22 | #include <errno.h> | |
23 | #include <linux/filter.h> | |
24 | #include <sys/prctl.h> | |
25 | #include <sys/ptrace.h> | |
26 | #include <sys/user.h> | |
27 | #include <linux/prctl.h> | |
28 | #include <linux/ptrace.h> | |
29 | #include <linux/seccomp.h> | |
c99ee51a KC |
30 | #include <pthread.h> |
31 | #include <semaphore.h> | |
32 | #include <signal.h> | |
33 | #include <stddef.h> | |
34 | #include <stdbool.h> | |
35 | #include <string.h> | |
256d0afb | 36 | #include <time.h> |
c99ee51a KC |
37 | #include <linux/elf.h> |
38 | #include <sys/uio.h> | |
256d0afb | 39 | #include <sys/utsname.h> |
fd88d16c RS |
40 | #include <sys/fcntl.h> |
41 | #include <sys/mman.h> | |
42 | #include <sys/times.h> | |
c99ee51a KC |
43 | |
44 | #define _GNU_SOURCE | |
45 | #include <unistd.h> | |
46 | #include <sys/syscall.h> | |
47 | ||
0b40808a | 48 | #include "../kselftest_harness.h" |
c99ee51a KC |
49 | |
50 | #ifndef PR_SET_PTRACER | |
51 | # define PR_SET_PTRACER 0x59616d61 | |
52 | #endif | |
53 | ||
54 | #ifndef PR_SET_NO_NEW_PRIVS | |
55 | #define PR_SET_NO_NEW_PRIVS 38 | |
56 | #define PR_GET_NO_NEW_PRIVS 39 | |
57 | #endif | |
58 | ||
59 | #ifndef PR_SECCOMP_EXT | |
60 | #define PR_SECCOMP_EXT 43 | |
61 | #endif | |
62 | ||
63 | #ifndef SECCOMP_EXT_ACT | |
64 | #define SECCOMP_EXT_ACT 1 | |
65 | #endif | |
66 | ||
67 | #ifndef SECCOMP_EXT_ACT_TSYNC | |
68 | #define SECCOMP_EXT_ACT_TSYNC 1 | |
69 | #endif | |
70 | ||
71 | #ifndef SECCOMP_MODE_STRICT | |
72 | #define SECCOMP_MODE_STRICT 1 | |
73 | #endif | |
74 | ||
75 | #ifndef SECCOMP_MODE_FILTER | |
76 | #define SECCOMP_MODE_FILTER 2 | |
77 | #endif | |
78 | ||
f3e1821d | 79 | #ifndef SECCOMP_RET_ALLOW |
c99ee51a KC |
80 | struct seccomp_data { |
81 | int nr; | |
82 | __u32 arch; | |
83 | __u64 instruction_pointer; | |
84 | __u64 args[6]; | |
85 | }; | |
86 | #endif | |
87 | ||
f3e1821d KC |
88 | #ifndef SECCOMP_RET_KILL_PROCESS |
89 | #define SECCOMP_RET_KILL_PROCESS 0x80000000U /* kill the process */ | |
fd76875c KC |
90 | #define SECCOMP_RET_KILL_THREAD 0x00000000U /* kill the thread */ |
91 | #endif | |
c99ee51a | 92 | #ifndef SECCOMP_RET_KILL |
fd76875c KC |
93 | #define SECCOMP_RET_KILL SECCOMP_RET_KILL_THREAD |
94 | #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */ | |
95 | #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */ | |
96 | #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */ | |
97 | #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */ | |
59f5cf44 TH |
98 | #endif |
99 | #ifndef SECCOMP_RET_LOG | |
fd76875c | 100 | #define SECCOMP_RET_LOG 0x7ffc0000U /* allow after logging */ |
59f5cf44 | 101 | #endif |
c99ee51a | 102 | |
f3e1821d KC |
103 | #ifndef __NR_seccomp |
104 | # if defined(__i386__) | |
105 | # define __NR_seccomp 354 | |
106 | # elif defined(__x86_64__) | |
107 | # define __NR_seccomp 317 | |
108 | # elif defined(__arm__) | |
109 | # define __NR_seccomp 383 | |
110 | # elif defined(__aarch64__) | |
111 | # define __NR_seccomp 277 | |
112 | # elif defined(__hppa__) | |
113 | # define __NR_seccomp 338 | |
114 | # elif defined(__powerpc__) | |
115 | # define __NR_seccomp 358 | |
116 | # elif defined(__s390__) | |
117 | # define __NR_seccomp 348 | |
118 | # else | |
119 | # warning "seccomp syscall number unknown for this architecture" | |
120 | # define __NR_seccomp 0xffff | |
121 | # endif | |
122 | #endif | |
c99ee51a | 123 | |
f3e1821d KC |
124 | #ifndef SECCOMP_SET_MODE_STRICT |
125 | #define SECCOMP_SET_MODE_STRICT 0 | |
126 | #endif | |
127 | ||
128 | #ifndef SECCOMP_SET_MODE_FILTER | |
129 | #define SECCOMP_SET_MODE_FILTER 1 | |
130 | #endif | |
131 | ||
132 | #ifndef SECCOMP_GET_ACTION_AVAIL | |
133 | #define SECCOMP_GET_ACTION_AVAIL 2 | |
134 | #endif | |
135 | ||
136 | #ifndef SECCOMP_FILTER_FLAG_TSYNC | |
00a02d0c | 137 | #define SECCOMP_FILTER_FLAG_TSYNC (1UL << 0) |
f3e1821d KC |
138 | #endif |
139 | ||
140 | #ifndef SECCOMP_FILTER_FLAG_LOG | |
00a02d0c KC |
141 | #define SECCOMP_FILTER_FLAG_LOG (1UL << 1) |
142 | #endif | |
143 | ||
144 | #ifndef SECCOMP_FILTER_FLAG_SPEC_ALLOW | |
145 | #define SECCOMP_FILTER_FLAG_SPEC_ALLOW (1UL << 2) | |
f3e1821d KC |
146 | #endif |
147 | ||
d057dc4e TA |
148 | #ifndef PTRACE_SECCOMP_GET_METADATA |
149 | #define PTRACE_SECCOMP_GET_METADATA 0x420d | |
150 | ||
151 | struct seccomp_metadata { | |
152 | __u64 filter_off; /* Input: which filter */ | |
153 | __u64 flags; /* Output: filter's flags */ | |
154 | }; | |
155 | #endif | |
156 | ||
f3e1821d KC |
157 | #ifndef seccomp |
158 | int seccomp(unsigned int op, unsigned int flags, void *args) | |
159 | { | |
160 | errno = 0; | |
161 | return syscall(__NR_seccomp, op, flags, args); | |
162 | } | |
c99ee51a KC |
163 | #endif |
164 | ||
c385d0db | 165 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
c99ee51a | 166 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n])) |
c385d0db ME |
167 | #elif __BYTE_ORDER == __BIG_ENDIAN |
168 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32)) | |
169 | #else | |
170 | #error "wut? Unknown __BYTE_ORDER?!" | |
171 | #endif | |
c99ee51a KC |
172 | |
173 | #define SIBLING_EXIT_UNKILLED 0xbadbeef | |
174 | #define SIBLING_EXIT_FAILURE 0xbadface | |
175 | #define SIBLING_EXIT_NEWPRIVS 0xbadfeed | |
176 | ||
177 | TEST(mode_strict_support) | |
178 | { | |
179 | long ret; | |
180 | ||
181 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
182 | ASSERT_EQ(0, ret) { | |
183 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
184 | } | |
369130b6 | 185 | syscall(__NR_exit, 0); |
c99ee51a KC |
186 | } |
187 | ||
188 | TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL) | |
189 | { | |
190 | long ret; | |
191 | ||
192 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
193 | ASSERT_EQ(0, ret) { | |
194 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
195 | } | |
196 | syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
197 | NULL, NULL, NULL); | |
198 | EXPECT_FALSE(true) { | |
199 | TH_LOG("Unreachable!"); | |
200 | } | |
201 | } | |
202 | ||
203 | /* Note! This doesn't test no new privs behavior */ | |
204 | TEST(no_new_privs_support) | |
205 | { | |
206 | long ret; | |
207 | ||
208 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
209 | EXPECT_EQ(0, ret) { | |
210 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
211 | } | |
212 | } | |
213 | ||
f3f6e306 | 214 | /* Tests kernel support by checking for a copy_from_user() fault on NULL. */ |
c99ee51a KC |
215 | TEST(mode_filter_support) |
216 | { | |
217 | long ret; | |
218 | ||
219 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
220 | ASSERT_EQ(0, ret) { | |
221 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
222 | } | |
223 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL); | |
224 | EXPECT_EQ(-1, ret); | |
225 | EXPECT_EQ(EFAULT, errno) { | |
226 | TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!"); | |
227 | } | |
228 | } | |
229 | ||
230 | TEST(mode_filter_without_nnp) | |
231 | { | |
232 | struct sock_filter filter[] = { | |
233 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
234 | }; | |
235 | struct sock_fprog prog = { | |
236 | .len = (unsigned short)ARRAY_SIZE(filter), | |
237 | .filter = filter, | |
238 | }; | |
239 | long ret; | |
240 | ||
241 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0); | |
242 | ASSERT_LE(0, ret) { | |
243 | TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS"); | |
244 | } | |
245 | errno = 0; | |
246 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
247 | /* Succeeds with CAP_SYS_ADMIN, fails without */ | |
248 | /* TODO(wad) check caps not euid */ | |
249 | if (geteuid()) { | |
250 | EXPECT_EQ(-1, ret); | |
251 | EXPECT_EQ(EACCES, errno); | |
252 | } else { | |
253 | EXPECT_EQ(0, ret); | |
254 | } | |
255 | } | |
256 | ||
257 | #define MAX_INSNS_PER_PATH 32768 | |
258 | ||
259 | TEST(filter_size_limits) | |
260 | { | |
261 | int i; | |
262 | int count = BPF_MAXINSNS + 1; | |
263 | struct sock_filter allow[] = { | |
264 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
265 | }; | |
266 | struct sock_filter *filter; | |
267 | struct sock_fprog prog = { }; | |
268 | long ret; | |
269 | ||
270 | filter = calloc(count, sizeof(*filter)); | |
271 | ASSERT_NE(NULL, filter); | |
272 | ||
273 | for (i = 0; i < count; i++) | |
274 | filter[i] = allow[0]; | |
275 | ||
276 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
277 | ASSERT_EQ(0, ret); | |
278 | ||
279 | prog.filter = filter; | |
280 | prog.len = count; | |
281 | ||
282 | /* Too many filter instructions in a single filter. */ | |
283 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
284 | ASSERT_NE(0, ret) { | |
285 | TH_LOG("Installing %d insn filter was allowed", prog.len); | |
286 | } | |
287 | ||
288 | /* One less is okay, though. */ | |
289 | prog.len -= 1; | |
290 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
291 | ASSERT_EQ(0, ret) { | |
292 | TH_LOG("Installing %d insn filter wasn't allowed", prog.len); | |
293 | } | |
294 | } | |
295 | ||
296 | TEST(filter_chain_limits) | |
297 | { | |
298 | int i; | |
299 | int count = BPF_MAXINSNS; | |
300 | struct sock_filter allow[] = { | |
301 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
302 | }; | |
303 | struct sock_filter *filter; | |
304 | struct sock_fprog prog = { }; | |
305 | long ret; | |
306 | ||
307 | filter = calloc(count, sizeof(*filter)); | |
308 | ASSERT_NE(NULL, filter); | |
309 | ||
310 | for (i = 0; i < count; i++) | |
311 | filter[i] = allow[0]; | |
312 | ||
313 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
314 | ASSERT_EQ(0, ret); | |
315 | ||
316 | prog.filter = filter; | |
317 | prog.len = 1; | |
318 | ||
319 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
320 | ASSERT_EQ(0, ret); | |
321 | ||
322 | prog.len = count; | |
323 | ||
324 | /* Too many total filter instructions. */ | |
325 | for (i = 0; i < MAX_INSNS_PER_PATH; i++) { | |
326 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
327 | if (ret != 0) | |
328 | break; | |
329 | } | |
330 | ASSERT_NE(0, ret) { | |
331 | TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)", | |
332 | i, count, i * (count + 4)); | |
333 | } | |
334 | } | |
335 | ||
336 | TEST(mode_filter_cannot_move_to_strict) | |
337 | { | |
338 | struct sock_filter filter[] = { | |
339 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
340 | }; | |
341 | struct sock_fprog prog = { | |
342 | .len = (unsigned short)ARRAY_SIZE(filter), | |
343 | .filter = filter, | |
344 | }; | |
345 | long ret; | |
346 | ||
347 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
348 | ASSERT_EQ(0, ret); | |
349 | ||
350 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
351 | ASSERT_EQ(0, ret); | |
352 | ||
353 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0); | |
354 | EXPECT_EQ(-1, ret); | |
355 | EXPECT_EQ(EINVAL, errno); | |
356 | } | |
357 | ||
358 | ||
359 | TEST(mode_filter_get_seccomp) | |
360 | { | |
361 | struct sock_filter filter[] = { | |
362 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
363 | }; | |
364 | struct sock_fprog prog = { | |
365 | .len = (unsigned short)ARRAY_SIZE(filter), | |
366 | .filter = filter, | |
367 | }; | |
368 | long ret; | |
369 | ||
370 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
371 | ASSERT_EQ(0, ret); | |
372 | ||
373 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
374 | EXPECT_EQ(0, ret); | |
375 | ||
376 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
377 | ASSERT_EQ(0, ret); | |
378 | ||
379 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
380 | EXPECT_EQ(2, ret); | |
381 | } | |
382 | ||
383 | ||
384 | TEST(ALLOW_all) | |
385 | { | |
386 | struct sock_filter filter[] = { | |
387 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
388 | }; | |
389 | struct sock_fprog prog = { | |
390 | .len = (unsigned short)ARRAY_SIZE(filter), | |
391 | .filter = filter, | |
392 | }; | |
393 | long ret; | |
394 | ||
395 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
396 | ASSERT_EQ(0, ret); | |
397 | ||
398 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
399 | ASSERT_EQ(0, ret); | |
400 | } | |
401 | ||
402 | TEST(empty_prog) | |
403 | { | |
404 | struct sock_filter filter[] = { | |
405 | }; | |
406 | struct sock_fprog prog = { | |
407 | .len = (unsigned short)ARRAY_SIZE(filter), | |
408 | .filter = filter, | |
409 | }; | |
410 | long ret; | |
411 | ||
412 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
413 | ASSERT_EQ(0, ret); | |
414 | ||
415 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
416 | EXPECT_EQ(-1, ret); | |
417 | EXPECT_EQ(EINVAL, errno); | |
418 | } | |
419 | ||
59f5cf44 TH |
420 | TEST(log_all) |
421 | { | |
422 | struct sock_filter filter[] = { | |
423 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG), | |
424 | }; | |
425 | struct sock_fprog prog = { | |
426 | .len = (unsigned short)ARRAY_SIZE(filter), | |
427 | .filter = filter, | |
428 | }; | |
429 | long ret; | |
430 | pid_t parent = getppid(); | |
431 | ||
432 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
433 | ASSERT_EQ(0, ret); | |
434 | ||
435 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
436 | ASSERT_EQ(0, ret); | |
437 | ||
438 | /* getppid() should succeed and be logged (no check for logging) */ | |
439 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
440 | } | |
441 | ||
c99ee51a KC |
442 | TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS) |
443 | { | |
444 | struct sock_filter filter[] = { | |
445 | BPF_STMT(BPF_RET|BPF_K, 0x10000000U), | |
446 | }; | |
447 | struct sock_fprog prog = { | |
448 | .len = (unsigned short)ARRAY_SIZE(filter), | |
449 | .filter = filter, | |
450 | }; | |
451 | long ret; | |
452 | ||
453 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
454 | ASSERT_EQ(0, ret); | |
455 | ||
456 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
457 | ASSERT_EQ(0, ret); | |
458 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
459 | TH_LOG("getpid() shouldn't ever return"); | |
460 | } | |
461 | } | |
462 | ||
463 | /* return code >= 0x80000000 is unused. */ | |
464 | TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS) | |
465 | { | |
466 | struct sock_filter filter[] = { | |
467 | BPF_STMT(BPF_RET|BPF_K, 0x90000000U), | |
468 | }; | |
469 | struct sock_fprog prog = { | |
470 | .len = (unsigned short)ARRAY_SIZE(filter), | |
471 | .filter = filter, | |
472 | }; | |
473 | long ret; | |
474 | ||
475 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
476 | ASSERT_EQ(0, ret); | |
477 | ||
478 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
479 | ASSERT_EQ(0, ret); | |
480 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
481 | TH_LOG("getpid() shouldn't ever return"); | |
482 | } | |
483 | } | |
484 | ||
485 | TEST_SIGNAL(KILL_all, SIGSYS) | |
486 | { | |
487 | struct sock_filter filter[] = { | |
488 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
489 | }; | |
490 | struct sock_fprog prog = { | |
491 | .len = (unsigned short)ARRAY_SIZE(filter), | |
492 | .filter = filter, | |
493 | }; | |
494 | long ret; | |
495 | ||
496 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
497 | ASSERT_EQ(0, ret); | |
498 | ||
499 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
500 | ASSERT_EQ(0, ret); | |
501 | } | |
502 | ||
503 | TEST_SIGNAL(KILL_one, SIGSYS) | |
504 | { | |
505 | struct sock_filter filter[] = { | |
506 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
507 | offsetof(struct seccomp_data, nr)), | |
508 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
509 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
510 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
511 | }; | |
512 | struct sock_fprog prog = { | |
513 | .len = (unsigned short)ARRAY_SIZE(filter), | |
514 | .filter = filter, | |
515 | }; | |
516 | long ret; | |
517 | pid_t parent = getppid(); | |
518 | ||
519 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
520 | ASSERT_EQ(0, ret); | |
521 | ||
522 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
523 | ASSERT_EQ(0, ret); | |
524 | ||
525 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
526 | /* getpid() should never return. */ | |
527 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
528 | } | |
529 | ||
530 | TEST_SIGNAL(KILL_one_arg_one, SIGSYS) | |
531 | { | |
fd88d16c | 532 | void *fatal_address; |
c99ee51a KC |
533 | struct sock_filter filter[] = { |
534 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
535 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 536 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0), |
c99ee51a KC |
537 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
538 | /* Only both with lower 32-bit for now. */ | |
539 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)), | |
fd88d16c RS |
540 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, |
541 | (unsigned long)&fatal_address, 0, 1), | |
c99ee51a KC |
542 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), |
543 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
544 | }; | |
545 | struct sock_fprog prog = { | |
546 | .len = (unsigned short)ARRAY_SIZE(filter), | |
547 | .filter = filter, | |
548 | }; | |
549 | long ret; | |
550 | pid_t parent = getppid(); | |
fd88d16c RS |
551 | struct tms timebuf; |
552 | clock_t clock = times(&timebuf); | |
c99ee51a KC |
553 | |
554 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
555 | ASSERT_EQ(0, ret); | |
556 | ||
557 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
558 | ASSERT_EQ(0, ret); | |
559 | ||
560 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
fd88d16c RS |
561 | EXPECT_LE(clock, syscall(__NR_times, &timebuf)); |
562 | /* times() should never return. */ | |
563 | EXPECT_EQ(0, syscall(__NR_times, &fatal_address)); | |
c99ee51a KC |
564 | } |
565 | ||
566 | TEST_SIGNAL(KILL_one_arg_six, SIGSYS) | |
567 | { | |
fd88d16c RS |
568 | #ifndef __NR_mmap2 |
569 | int sysno = __NR_mmap; | |
570 | #else | |
571 | int sysno = __NR_mmap2; | |
572 | #endif | |
c99ee51a KC |
573 | struct sock_filter filter[] = { |
574 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
575 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 576 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0), |
c99ee51a KC |
577 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
578 | /* Only both with lower 32-bit for now. */ | |
579 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)), | |
580 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1), | |
581 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
582 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
583 | }; | |
584 | struct sock_fprog prog = { | |
585 | .len = (unsigned short)ARRAY_SIZE(filter), | |
586 | .filter = filter, | |
587 | }; | |
588 | long ret; | |
589 | pid_t parent = getppid(); | |
fd88d16c RS |
590 | int fd; |
591 | void *map1, *map2; | |
2ce47b44 BJZ |
592 | int page_size = sysconf(_SC_PAGESIZE); |
593 | ||
594 | ASSERT_LT(0, page_size); | |
c99ee51a KC |
595 | |
596 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
597 | ASSERT_EQ(0, ret); | |
598 | ||
599 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
600 | ASSERT_EQ(0, ret); | |
601 | ||
fd88d16c RS |
602 | fd = open("/dev/zero", O_RDONLY); |
603 | ASSERT_NE(-1, fd); | |
604 | ||
c99ee51a | 605 | EXPECT_EQ(parent, syscall(__NR_getppid)); |
fd88d16c | 606 | map1 = (void *)syscall(sysno, |
2ce47b44 | 607 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size); |
fd88d16c RS |
608 | EXPECT_NE(MAP_FAILED, map1); |
609 | /* mmap2() should never return. */ | |
610 | map2 = (void *)syscall(sysno, | |
2ce47b44 | 611 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE); |
fd88d16c RS |
612 | EXPECT_EQ(MAP_FAILED, map2); |
613 | ||
614 | /* The test failed, so clean up the resources. */ | |
2ce47b44 BJZ |
615 | munmap(map1, page_size); |
616 | munmap(map2, page_size); | |
fd88d16c | 617 | close(fd); |
c99ee51a KC |
618 | } |
619 | ||
f3e1821d KC |
620 | /* This is a thread task to die via seccomp filter violation. */ |
621 | void *kill_thread(void *data) | |
622 | { | |
623 | bool die = (bool)data; | |
624 | ||
625 | if (die) { | |
626 | prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
627 | return (void *)SIBLING_EXIT_FAILURE; | |
628 | } | |
629 | ||
630 | return (void *)SIBLING_EXIT_UNKILLED; | |
631 | } | |
632 | ||
633 | /* Prepare a thread that will kill itself or both of us. */ | |
634 | void kill_thread_or_group(struct __test_metadata *_metadata, bool kill_process) | |
635 | { | |
636 | pthread_t thread; | |
637 | void *status; | |
638 | /* Kill only when calling __NR_prctl. */ | |
639 | struct sock_filter filter_thread[] = { | |
640 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
641 | offsetof(struct seccomp_data, nr)), | |
642 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
643 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_THREAD), | |
644 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
645 | }; | |
646 | struct sock_fprog prog_thread = { | |
647 | .len = (unsigned short)ARRAY_SIZE(filter_thread), | |
648 | .filter = filter_thread, | |
649 | }; | |
650 | struct sock_filter filter_process[] = { | |
651 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
652 | offsetof(struct seccomp_data, nr)), | |
653 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
654 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL_PROCESS), | |
655 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
656 | }; | |
657 | struct sock_fprog prog_process = { | |
658 | .len = (unsigned short)ARRAY_SIZE(filter_process), | |
659 | .filter = filter_process, | |
660 | }; | |
661 | ||
662 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
663 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
664 | } | |
665 | ||
666 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, | |
667 | kill_process ? &prog_process : &prog_thread)); | |
668 | ||
669 | /* | |
670 | * Add the KILL_THREAD rule again to make sure that the KILL_PROCESS | |
671 | * flag cannot be downgraded by a new filter. | |
672 | */ | |
673 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog_thread)); | |
674 | ||
675 | /* Start a thread that will exit immediately. */ | |
676 | ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)false)); | |
677 | ASSERT_EQ(0, pthread_join(thread, &status)); | |
678 | ASSERT_EQ(SIBLING_EXIT_UNKILLED, (unsigned long)status); | |
679 | ||
680 | /* Start a thread that will die immediately. */ | |
681 | ASSERT_EQ(0, pthread_create(&thread, NULL, kill_thread, (void *)true)); | |
682 | ASSERT_EQ(0, pthread_join(thread, &status)); | |
683 | ASSERT_NE(SIBLING_EXIT_FAILURE, (unsigned long)status); | |
684 | ||
685 | /* | |
686 | * If we get here, only the spawned thread died. Let the parent know | |
687 | * the whole process didn't die (i.e. this thread, the spawner, | |
688 | * stayed running). | |
689 | */ | |
690 | exit(42); | |
691 | } | |
692 | ||
693 | TEST(KILL_thread) | |
694 | { | |
695 | int status; | |
696 | pid_t child_pid; | |
697 | ||
698 | child_pid = fork(); | |
699 | ASSERT_LE(0, child_pid); | |
700 | if (child_pid == 0) { | |
701 | kill_thread_or_group(_metadata, false); | |
702 | _exit(38); | |
703 | } | |
704 | ||
705 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
706 | ||
707 | /* If only the thread was killed, we'll see exit 42. */ | |
708 | ASSERT_TRUE(WIFEXITED(status)); | |
709 | ASSERT_EQ(42, WEXITSTATUS(status)); | |
710 | } | |
711 | ||
712 | TEST(KILL_process) | |
713 | { | |
714 | int status; | |
715 | pid_t child_pid; | |
716 | ||
717 | child_pid = fork(); | |
718 | ASSERT_LE(0, child_pid); | |
719 | if (child_pid == 0) { | |
720 | kill_thread_or_group(_metadata, true); | |
721 | _exit(38); | |
722 | } | |
723 | ||
724 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
725 | ||
726 | /* If the entire process was killed, we'll see SIGSYS. */ | |
727 | ASSERT_TRUE(WIFSIGNALED(status)); | |
728 | ASSERT_EQ(SIGSYS, WTERMSIG(status)); | |
729 | } | |
730 | ||
c99ee51a KC |
731 | /* TODO(wad) add 64-bit versus 32-bit arg tests. */ |
732 | TEST(arg_out_of_range) | |
733 | { | |
734 | struct sock_filter filter[] = { | |
735 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)), | |
736 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
737 | }; | |
738 | struct sock_fprog prog = { | |
739 | .len = (unsigned short)ARRAY_SIZE(filter), | |
740 | .filter = filter, | |
741 | }; | |
742 | long ret; | |
743 | ||
744 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
745 | ASSERT_EQ(0, ret); | |
746 | ||
747 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
748 | EXPECT_EQ(-1, ret); | |
749 | EXPECT_EQ(EINVAL, errno); | |
750 | } | |
751 | ||
f3f6e306 KC |
752 | #define ERRNO_FILTER(name, errno) \ |
753 | struct sock_filter _read_filter_##name[] = { \ | |
754 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \ | |
755 | offsetof(struct seccomp_data, nr)), \ | |
756 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \ | |
757 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \ | |
758 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \ | |
759 | }; \ | |
760 | struct sock_fprog prog_##name = { \ | |
761 | .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \ | |
762 | .filter = _read_filter_##name, \ | |
763 | } | |
764 | ||
765 | /* Make sure basic errno values are correctly passed through a filter. */ | |
c99ee51a KC |
766 | TEST(ERRNO_valid) |
767 | { | |
f3f6e306 | 768 | ERRNO_FILTER(valid, E2BIG); |
c99ee51a KC |
769 | long ret; |
770 | pid_t parent = getppid(); | |
771 | ||
772 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
773 | ASSERT_EQ(0, ret); | |
774 | ||
f3f6e306 | 775 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid); |
c99ee51a KC |
776 | ASSERT_EQ(0, ret); |
777 | ||
778 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
779 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
780 | EXPECT_EQ(E2BIG, errno); | |
781 | } | |
782 | ||
f3f6e306 | 783 | /* Make sure an errno of zero is correctly handled by the arch code. */ |
c99ee51a KC |
784 | TEST(ERRNO_zero) |
785 | { | |
f3f6e306 | 786 | ERRNO_FILTER(zero, 0); |
c99ee51a KC |
787 | long ret; |
788 | pid_t parent = getppid(); | |
789 | ||
790 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
791 | ASSERT_EQ(0, ret); | |
792 | ||
f3f6e306 | 793 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero); |
c99ee51a KC |
794 | ASSERT_EQ(0, ret); |
795 | ||
796 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
797 | /* "errno" of 0 is ok. */ | |
798 | EXPECT_EQ(0, read(0, NULL, 0)); | |
799 | } | |
800 | ||
f3f6e306 KC |
801 | /* |
802 | * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller. | |
803 | * This tests that the errno value gets capped correctly, fixed by | |
804 | * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO"). | |
805 | */ | |
c99ee51a KC |
806 | TEST(ERRNO_capped) |
807 | { | |
f3f6e306 | 808 | ERRNO_FILTER(capped, 4096); |
c99ee51a KC |
809 | long ret; |
810 | pid_t parent = getppid(); | |
811 | ||
812 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
813 | ASSERT_EQ(0, ret); | |
814 | ||
f3f6e306 | 815 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped); |
c99ee51a KC |
816 | ASSERT_EQ(0, ret); |
817 | ||
818 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
819 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
820 | EXPECT_EQ(4095, errno); | |
821 | } | |
822 | ||
f3f6e306 KC |
823 | /* |
824 | * Filters are processed in reverse order: last applied is executed first. | |
825 | * Since only the SECCOMP_RET_ACTION mask is tested for return values, the | |
826 | * SECCOMP_RET_DATA mask results will follow the most recently applied | |
827 | * matching filter return (and not the lowest or highest value). | |
828 | */ | |
829 | TEST(ERRNO_order) | |
830 | { | |
831 | ERRNO_FILTER(first, 11); | |
832 | ERRNO_FILTER(second, 13); | |
833 | ERRNO_FILTER(third, 12); | |
834 | long ret; | |
835 | pid_t parent = getppid(); | |
836 | ||
837 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
838 | ASSERT_EQ(0, ret); | |
839 | ||
840 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first); | |
841 | ASSERT_EQ(0, ret); | |
842 | ||
843 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second); | |
844 | ASSERT_EQ(0, ret); | |
845 | ||
846 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third); | |
847 | ASSERT_EQ(0, ret); | |
848 | ||
849 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
850 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
851 | EXPECT_EQ(12, errno); | |
852 | } | |
853 | ||
c99ee51a KC |
854 | FIXTURE_DATA(TRAP) { |
855 | struct sock_fprog prog; | |
856 | }; | |
857 | ||
858 | FIXTURE_SETUP(TRAP) | |
859 | { | |
860 | struct sock_filter filter[] = { | |
861 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
862 | offsetof(struct seccomp_data, nr)), | |
863 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
864 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
865 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
866 | }; | |
867 | ||
868 | memset(&self->prog, 0, sizeof(self->prog)); | |
869 | self->prog.filter = malloc(sizeof(filter)); | |
870 | ASSERT_NE(NULL, self->prog.filter); | |
871 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
872 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
873 | } | |
874 | ||
875 | FIXTURE_TEARDOWN(TRAP) | |
876 | { | |
877 | if (self->prog.filter) | |
878 | free(self->prog.filter); | |
879 | } | |
880 | ||
881 | TEST_F_SIGNAL(TRAP, dfl, SIGSYS) | |
882 | { | |
883 | long ret; | |
884 | ||
885 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
886 | ASSERT_EQ(0, ret); | |
887 | ||
888 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
889 | ASSERT_EQ(0, ret); | |
890 | syscall(__NR_getpid); | |
891 | } | |
892 | ||
893 | /* Ensure that SIGSYS overrides SIG_IGN */ | |
894 | TEST_F_SIGNAL(TRAP, ign, SIGSYS) | |
895 | { | |
896 | long ret; | |
897 | ||
898 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
899 | ASSERT_EQ(0, ret); | |
900 | ||
901 | signal(SIGSYS, SIG_IGN); | |
902 | ||
903 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
904 | ASSERT_EQ(0, ret); | |
905 | syscall(__NR_getpid); | |
906 | } | |
907 | ||
10859f38 | 908 | static siginfo_t TRAP_info; |
c99ee51a KC |
909 | static volatile int TRAP_nr; |
910 | static void TRAP_action(int nr, siginfo_t *info, void *void_context) | |
911 | { | |
912 | memcpy(&TRAP_info, info, sizeof(TRAP_info)); | |
913 | TRAP_nr = nr; | |
914 | } | |
915 | ||
916 | TEST_F(TRAP, handler) | |
917 | { | |
918 | int ret, test; | |
919 | struct sigaction act; | |
920 | sigset_t mask; | |
921 | ||
922 | memset(&act, 0, sizeof(act)); | |
923 | sigemptyset(&mask); | |
924 | sigaddset(&mask, SIGSYS); | |
925 | ||
926 | act.sa_sigaction = &TRAP_action; | |
927 | act.sa_flags = SA_SIGINFO; | |
928 | ret = sigaction(SIGSYS, &act, NULL); | |
929 | ASSERT_EQ(0, ret) { | |
930 | TH_LOG("sigaction failed"); | |
931 | } | |
932 | ret = sigprocmask(SIG_UNBLOCK, &mask, NULL); | |
933 | ASSERT_EQ(0, ret) { | |
934 | TH_LOG("sigprocmask failed"); | |
935 | } | |
936 | ||
937 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
938 | ASSERT_EQ(0, ret); | |
939 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
940 | ASSERT_EQ(0, ret); | |
941 | TRAP_nr = 0; | |
942 | memset(&TRAP_info, 0, sizeof(TRAP_info)); | |
943 | /* Expect the registers to be rolled back. (nr = error) may vary | |
944 | * based on arch. */ | |
945 | ret = syscall(__NR_getpid); | |
946 | /* Silence gcc warning about volatile. */ | |
947 | test = TRAP_nr; | |
948 | EXPECT_EQ(SIGSYS, test); | |
949 | struct local_sigsys { | |
950 | void *_call_addr; /* calling user insn */ | |
951 | int _syscall; /* triggering system call number */ | |
952 | unsigned int _arch; /* AUDIT_ARCH_* of syscall */ | |
953 | } *sigsys = (struct local_sigsys *) | |
954 | #ifdef si_syscall | |
955 | &(TRAP_info.si_call_addr); | |
956 | #else | |
957 | &TRAP_info.si_pid; | |
958 | #endif | |
959 | EXPECT_EQ(__NR_getpid, sigsys->_syscall); | |
960 | /* Make sure arch is non-zero. */ | |
961 | EXPECT_NE(0, sigsys->_arch); | |
962 | EXPECT_NE(0, (unsigned long)sigsys->_call_addr); | |
963 | } | |
964 | ||
965 | FIXTURE_DATA(precedence) { | |
966 | struct sock_fprog allow; | |
59f5cf44 | 967 | struct sock_fprog log; |
c99ee51a KC |
968 | struct sock_fprog trace; |
969 | struct sock_fprog error; | |
970 | struct sock_fprog trap; | |
971 | struct sock_fprog kill; | |
972 | }; | |
973 | ||
974 | FIXTURE_SETUP(precedence) | |
975 | { | |
976 | struct sock_filter allow_insns[] = { | |
977 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
978 | }; | |
59f5cf44 TH |
979 | struct sock_filter log_insns[] = { |
980 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
981 | offsetof(struct seccomp_data, nr)), | |
982 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
983 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
984 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_LOG), | |
985 | }; | |
c99ee51a KC |
986 | struct sock_filter trace_insns[] = { |
987 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
988 | offsetof(struct seccomp_data, nr)), | |
989 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
990 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
991 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE), | |
992 | }; | |
993 | struct sock_filter error_insns[] = { | |
994 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
995 | offsetof(struct seccomp_data, nr)), | |
996 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
997 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
998 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO), | |
999 | }; | |
1000 | struct sock_filter trap_insns[] = { | |
1001 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1002 | offsetof(struct seccomp_data, nr)), | |
1003 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1004 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1005 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
1006 | }; | |
1007 | struct sock_filter kill_insns[] = { | |
1008 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1009 | offsetof(struct seccomp_data, nr)), | |
1010 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
1011 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1012 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1013 | }; | |
1014 | ||
1015 | memset(self, 0, sizeof(*self)); | |
1016 | #define FILTER_ALLOC(_x) \ | |
1017 | self->_x.filter = malloc(sizeof(_x##_insns)); \ | |
1018 | ASSERT_NE(NULL, self->_x.filter); \ | |
1019 | memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \ | |
1020 | self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns) | |
1021 | FILTER_ALLOC(allow); | |
59f5cf44 | 1022 | FILTER_ALLOC(log); |
c99ee51a KC |
1023 | FILTER_ALLOC(trace); |
1024 | FILTER_ALLOC(error); | |
1025 | FILTER_ALLOC(trap); | |
1026 | FILTER_ALLOC(kill); | |
1027 | } | |
1028 | ||
1029 | FIXTURE_TEARDOWN(precedence) | |
1030 | { | |
1031 | #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter) | |
1032 | FILTER_FREE(allow); | |
59f5cf44 | 1033 | FILTER_FREE(log); |
c99ee51a KC |
1034 | FILTER_FREE(trace); |
1035 | FILTER_FREE(error); | |
1036 | FILTER_FREE(trap); | |
1037 | FILTER_FREE(kill); | |
1038 | } | |
1039 | ||
1040 | TEST_F(precedence, allow_ok) | |
1041 | { | |
1042 | pid_t parent, res = 0; | |
1043 | long ret; | |
1044 | ||
1045 | parent = getppid(); | |
1046 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1047 | ASSERT_EQ(0, ret); | |
1048 | ||
1049 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1050 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1051 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1052 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1053 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1054 | ASSERT_EQ(0, ret); | |
1055 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1056 | ASSERT_EQ(0, ret); | |
1057 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1058 | ASSERT_EQ(0, ret); | |
1059 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
1060 | ASSERT_EQ(0, ret); | |
1061 | /* Should work just fine. */ | |
1062 | res = syscall(__NR_getppid); | |
1063 | EXPECT_EQ(parent, res); | |
1064 | } | |
1065 | ||
1066 | TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS) | |
1067 | { | |
1068 | pid_t parent, res = 0; | |
1069 | long ret; | |
1070 | ||
1071 | parent = getppid(); | |
1072 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1073 | ASSERT_EQ(0, ret); | |
1074 | ||
1075 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1076 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1077 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1078 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1079 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1080 | ASSERT_EQ(0, ret); | |
1081 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1082 | ASSERT_EQ(0, ret); | |
1083 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1084 | ASSERT_EQ(0, ret); | |
1085 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
1086 | ASSERT_EQ(0, ret); | |
1087 | /* Should work just fine. */ | |
1088 | res = syscall(__NR_getppid); | |
1089 | EXPECT_EQ(parent, res); | |
1090 | /* getpid() should never return. */ | |
1091 | res = syscall(__NR_getpid); | |
1092 | EXPECT_EQ(0, res); | |
1093 | } | |
1094 | ||
1095 | TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS) | |
1096 | { | |
1097 | pid_t parent; | |
1098 | long ret; | |
1099 | ||
1100 | parent = getppid(); | |
1101 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1102 | ASSERT_EQ(0, ret); | |
1103 | ||
1104 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1105 | ASSERT_EQ(0, ret); | |
1106 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
1107 | ASSERT_EQ(0, ret); | |
1108 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1109 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1110 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1111 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1112 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1113 | ASSERT_EQ(0, ret); | |
1114 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1115 | ASSERT_EQ(0, ret); | |
1116 | /* Should work just fine. */ | |
1117 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1118 | /* getpid() should never return. */ | |
1119 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1120 | } | |
1121 | ||
1122 | TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS) | |
1123 | { | |
1124 | pid_t parent; | |
1125 | long ret; | |
1126 | ||
1127 | parent = getppid(); | |
1128 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1129 | ASSERT_EQ(0, ret); | |
1130 | ||
1131 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1132 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1133 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1134 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1135 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1136 | ASSERT_EQ(0, ret); | |
1137 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1138 | ASSERT_EQ(0, ret); | |
1139 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1140 | ASSERT_EQ(0, ret); | |
1141 | /* Should work just fine. */ | |
1142 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1143 | /* getpid() should never return. */ | |
1144 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1145 | } | |
1146 | ||
1147 | TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS) | |
1148 | { | |
1149 | pid_t parent; | |
1150 | long ret; | |
1151 | ||
1152 | parent = getppid(); | |
1153 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1154 | ASSERT_EQ(0, ret); | |
1155 | ||
1156 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1157 | ASSERT_EQ(0, ret); | |
1158 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
1159 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1160 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1161 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1162 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1163 | ASSERT_EQ(0, ret); | |
1164 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1165 | ASSERT_EQ(0, ret); | |
1166 | /* Should work just fine. */ | |
1167 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1168 | /* getpid() should never return. */ | |
1169 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1170 | } | |
1171 | ||
1172 | TEST_F(precedence, errno_is_third) | |
1173 | { | |
1174 | pid_t parent; | |
1175 | long ret; | |
1176 | ||
1177 | parent = getppid(); | |
1178 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1179 | ASSERT_EQ(0, ret); | |
1180 | ||
1181 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1182 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1183 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1184 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1185 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1186 | ASSERT_EQ(0, ret); | |
1187 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
1188 | ASSERT_EQ(0, ret); | |
1189 | /* Should work just fine. */ | |
1190 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1191 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1192 | } | |
1193 | ||
1194 | TEST_F(precedence, errno_is_third_in_any_order) | |
1195 | { | |
1196 | pid_t parent; | |
1197 | long ret; | |
1198 | ||
1199 | parent = getppid(); | |
1200 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1201 | ASSERT_EQ(0, ret); | |
1202 | ||
59f5cf44 TH |
1203 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1204 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1205 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); |
1206 | ASSERT_EQ(0, ret); | |
1207 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
1208 | ASSERT_EQ(0, ret); | |
1209 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1210 | ASSERT_EQ(0, ret); | |
1211 | /* Should work just fine. */ | |
1212 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1213 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
1214 | } | |
1215 | ||
1216 | TEST_F(precedence, trace_is_fourth) | |
1217 | { | |
1218 | pid_t parent; | |
1219 | long ret; | |
1220 | ||
1221 | parent = getppid(); | |
1222 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1223 | ASSERT_EQ(0, ret); | |
1224 | ||
1225 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1226 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1227 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1228 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1229 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); |
1230 | ASSERT_EQ(0, ret); | |
1231 | /* Should work just fine. */ | |
1232 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1233 | /* No ptracer */ | |
1234 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1235 | } | |
1236 | ||
1237 | TEST_F(precedence, trace_is_fourth_in_any_order) | |
1238 | { | |
1239 | pid_t parent; | |
1240 | long ret; | |
1241 | ||
1242 | parent = getppid(); | |
1243 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1244 | ASSERT_EQ(0, ret); | |
1245 | ||
1246 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
1247 | ASSERT_EQ(0, ret); | |
1248 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1249 | ASSERT_EQ(0, ret); | |
59f5cf44 TH |
1250 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); |
1251 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1252 | /* Should work just fine. */ |
1253 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1254 | /* No ptracer */ | |
1255 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1256 | } | |
1257 | ||
59f5cf44 TH |
1258 | TEST_F(precedence, log_is_fifth) |
1259 | { | |
1260 | pid_t mypid, parent; | |
1261 | long ret; | |
1262 | ||
1263 | mypid = getpid(); | |
1264 | parent = getppid(); | |
1265 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1266 | ASSERT_EQ(0, ret); | |
1267 | ||
1268 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1269 | ASSERT_EQ(0, ret); | |
1270 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); | |
1271 | ASSERT_EQ(0, ret); | |
1272 | /* Should work just fine. */ | |
1273 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1274 | /* Should also work just fine */ | |
1275 | EXPECT_EQ(mypid, syscall(__NR_getpid)); | |
1276 | } | |
1277 | ||
1278 | TEST_F(precedence, log_is_fifth_in_any_order) | |
1279 | { | |
1280 | pid_t mypid, parent; | |
1281 | long ret; | |
1282 | ||
1283 | mypid = getpid(); | |
1284 | parent = getppid(); | |
1285 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1286 | ASSERT_EQ(0, ret); | |
1287 | ||
1288 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->log); | |
1289 | ASSERT_EQ(0, ret); | |
1290 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1291 | ASSERT_EQ(0, ret); | |
1292 | /* Should work just fine. */ | |
1293 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1294 | /* Should also work just fine */ | |
1295 | EXPECT_EQ(mypid, syscall(__NR_getpid)); | |
1296 | } | |
1297 | ||
c99ee51a KC |
1298 | #ifndef PTRACE_O_TRACESECCOMP |
1299 | #define PTRACE_O_TRACESECCOMP 0x00000080 | |
1300 | #endif | |
1301 | ||
1302 | /* Catch the Ubuntu 12.04 value error. */ | |
1303 | #if PTRACE_EVENT_SECCOMP != 7 | |
1304 | #undef PTRACE_EVENT_SECCOMP | |
1305 | #endif | |
1306 | ||
1307 | #ifndef PTRACE_EVENT_SECCOMP | |
1308 | #define PTRACE_EVENT_SECCOMP 7 | |
1309 | #endif | |
1310 | ||
1311 | #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP) | |
1312 | bool tracer_running; | |
1313 | void tracer_stop(int sig) | |
1314 | { | |
1315 | tracer_running = false; | |
1316 | } | |
1317 | ||
1318 | typedef void tracer_func_t(struct __test_metadata *_metadata, | |
1319 | pid_t tracee, int status, void *args); | |
1320 | ||
58d0a862 KC |
1321 | void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee, |
1322 | tracer_func_t tracer_func, void *args, bool ptrace_syscall) | |
c99ee51a KC |
1323 | { |
1324 | int ret = -1; | |
1325 | struct sigaction action = { | |
1326 | .sa_handler = tracer_stop, | |
1327 | }; | |
1328 | ||
1329 | /* Allow external shutdown. */ | |
1330 | tracer_running = true; | |
1331 | ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL)); | |
1332 | ||
1333 | errno = 0; | |
1334 | while (ret == -1 && errno != EINVAL) | |
1335 | ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0); | |
1336 | ASSERT_EQ(0, ret) { | |
1337 | kill(tracee, SIGKILL); | |
1338 | } | |
1339 | /* Wait for attach stop */ | |
1340 | wait(NULL); | |
1341 | ||
58d0a862 KC |
1342 | ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ? |
1343 | PTRACE_O_TRACESYSGOOD : | |
1344 | PTRACE_O_TRACESECCOMP); | |
c99ee51a KC |
1345 | ASSERT_EQ(0, ret) { |
1346 | TH_LOG("Failed to set PTRACE_O_TRACESECCOMP"); | |
1347 | kill(tracee, SIGKILL); | |
1348 | } | |
58d0a862 KC |
1349 | ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT, |
1350 | tracee, NULL, 0); | |
1351 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1352 | |
1353 | /* Unblock the tracee */ | |
1354 | ASSERT_EQ(1, write(fd, "A", 1)); | |
1355 | ASSERT_EQ(0, close(fd)); | |
1356 | ||
1357 | /* Run until we're shut down. Must assert to stop execution. */ | |
1358 | while (tracer_running) { | |
1359 | int status; | |
1360 | ||
1361 | if (wait(&status) != tracee) | |
1362 | continue; | |
1363 | if (WIFSIGNALED(status) || WIFEXITED(status)) | |
1364 | /* Child is dead. Time to go. */ | |
1365 | return; | |
1366 | ||
58d0a862 KC |
1367 | /* Check if this is a seccomp event. */ |
1368 | ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status)); | |
c99ee51a KC |
1369 | |
1370 | tracer_func(_metadata, tracee, status, args); | |
1371 | ||
58d0a862 KC |
1372 | ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT, |
1373 | tracee, NULL, 0); | |
c99ee51a KC |
1374 | ASSERT_EQ(0, ret); |
1375 | } | |
1376 | /* Directly report the status of our test harness results. */ | |
1377 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); | |
1378 | } | |
1379 | ||
1380 | /* Common tracer setup/teardown functions. */ | |
1381 | void cont_handler(int num) | |
1382 | { } | |
1383 | pid_t setup_trace_fixture(struct __test_metadata *_metadata, | |
58d0a862 | 1384 | tracer_func_t func, void *args, bool ptrace_syscall) |
c99ee51a KC |
1385 | { |
1386 | char sync; | |
1387 | int pipefd[2]; | |
1388 | pid_t tracer_pid; | |
1389 | pid_t tracee = getpid(); | |
1390 | ||
1391 | /* Setup a pipe for clean synchronization. */ | |
1392 | ASSERT_EQ(0, pipe(pipefd)); | |
1393 | ||
1394 | /* Fork a child which we'll promote to tracer */ | |
1395 | tracer_pid = fork(); | |
1396 | ASSERT_LE(0, tracer_pid); | |
1397 | signal(SIGALRM, cont_handler); | |
1398 | if (tracer_pid == 0) { | |
1399 | close(pipefd[0]); | |
58d0a862 KC |
1400 | start_tracer(_metadata, pipefd[1], tracee, func, args, |
1401 | ptrace_syscall); | |
c99ee51a KC |
1402 | syscall(__NR_exit, 0); |
1403 | } | |
1404 | close(pipefd[1]); | |
1405 | prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0); | |
1406 | read(pipefd[0], &sync, 1); | |
1407 | close(pipefd[0]); | |
1408 | ||
1409 | return tracer_pid; | |
1410 | } | |
1411 | void teardown_trace_fixture(struct __test_metadata *_metadata, | |
1412 | pid_t tracer) | |
1413 | { | |
1414 | if (tracer) { | |
1415 | int status; | |
1416 | /* | |
1417 | * Extract the exit code from the other process and | |
1418 | * adopt it for ourselves in case its asserts failed. | |
1419 | */ | |
1420 | ASSERT_EQ(0, kill(tracer, SIGUSR1)); | |
1421 | ASSERT_EQ(tracer, waitpid(tracer, &status, 0)); | |
1422 | if (WEXITSTATUS(status)) | |
1423 | _metadata->passed = 0; | |
1424 | } | |
1425 | } | |
1426 | ||
1427 | /* "poke" tracer arguments and function. */ | |
1428 | struct tracer_args_poke_t { | |
1429 | unsigned long poke_addr; | |
1430 | }; | |
1431 | ||
1432 | void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status, | |
1433 | void *args) | |
1434 | { | |
1435 | int ret; | |
1436 | unsigned long msg; | |
1437 | struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args; | |
1438 | ||
1439 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1440 | EXPECT_EQ(0, ret); | |
1441 | /* If this fails, don't try to recover. */ | |
1442 | ASSERT_EQ(0x1001, msg) { | |
1443 | kill(tracee, SIGKILL); | |
1444 | } | |
1445 | /* | |
1446 | * Poke in the message. | |
1447 | * Registers are not touched to try to keep this relatively arch | |
1448 | * agnostic. | |
1449 | */ | |
1450 | ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001); | |
1451 | EXPECT_EQ(0, ret); | |
1452 | } | |
1453 | ||
1454 | FIXTURE_DATA(TRACE_poke) { | |
1455 | struct sock_fprog prog; | |
1456 | pid_t tracer; | |
1457 | long poked; | |
1458 | struct tracer_args_poke_t tracer_args; | |
1459 | }; | |
1460 | ||
1461 | FIXTURE_SETUP(TRACE_poke) | |
1462 | { | |
1463 | struct sock_filter filter[] = { | |
1464 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1465 | offsetof(struct seccomp_data, nr)), | |
1466 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
1467 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001), | |
1468 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1469 | }; | |
1470 | ||
1471 | self->poked = 0; | |
1472 | memset(&self->prog, 0, sizeof(self->prog)); | |
1473 | self->prog.filter = malloc(sizeof(filter)); | |
1474 | ASSERT_NE(NULL, self->prog.filter); | |
1475 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1476 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1477 | ||
1478 | /* Set up tracer args. */ | |
1479 | self->tracer_args.poke_addr = (unsigned long)&self->poked; | |
1480 | ||
1481 | /* Launch tracer. */ | |
1482 | self->tracer = setup_trace_fixture(_metadata, tracer_poke, | |
58d0a862 | 1483 | &self->tracer_args, false); |
c99ee51a KC |
1484 | } |
1485 | ||
1486 | FIXTURE_TEARDOWN(TRACE_poke) | |
1487 | { | |
1488 | teardown_trace_fixture(_metadata, self->tracer); | |
1489 | if (self->prog.filter) | |
1490 | free(self->prog.filter); | |
1491 | } | |
1492 | ||
1493 | TEST_F(TRACE_poke, read_has_side_effects) | |
1494 | { | |
1495 | ssize_t ret; | |
1496 | ||
1497 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1498 | ASSERT_EQ(0, ret); | |
1499 | ||
1500 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1501 | ASSERT_EQ(0, ret); | |
1502 | ||
1503 | EXPECT_EQ(0, self->poked); | |
1504 | ret = read(-1, NULL, 0); | |
1505 | EXPECT_EQ(-1, ret); | |
1506 | EXPECT_EQ(0x1001, self->poked); | |
1507 | } | |
1508 | ||
1509 | TEST_F(TRACE_poke, getpid_runs_normally) | |
1510 | { | |
1511 | long ret; | |
1512 | ||
1513 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1514 | ASSERT_EQ(0, ret); | |
1515 | ||
1516 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1517 | ASSERT_EQ(0, ret); | |
1518 | ||
1519 | EXPECT_EQ(0, self->poked); | |
1520 | EXPECT_NE(0, syscall(__NR_getpid)); | |
1521 | EXPECT_EQ(0, self->poked); | |
1522 | } | |
1523 | ||
1524 | #if defined(__x86_64__) | |
1525 | # define ARCH_REGS struct user_regs_struct | |
1526 | # define SYSCALL_NUM orig_rax | |
1527 | # define SYSCALL_RET rax | |
1528 | #elif defined(__i386__) | |
1529 | # define ARCH_REGS struct user_regs_struct | |
1530 | # define SYSCALL_NUM orig_eax | |
1531 | # define SYSCALL_RET eax | |
1532 | #elif defined(__arm__) | |
1533 | # define ARCH_REGS struct pt_regs | |
1534 | # define SYSCALL_NUM ARM_r7 | |
1535 | # define SYSCALL_RET ARM_r0 | |
1536 | #elif defined(__aarch64__) | |
1537 | # define ARCH_REGS struct user_pt_regs | |
1538 | # define SYSCALL_NUM regs[8] | |
1539 | # define SYSCALL_RET regs[0] | |
64e2a42b HD |
1540 | #elif defined(__hppa__) |
1541 | # define ARCH_REGS struct user_regs_struct | |
1542 | # define SYSCALL_NUM gr[20] | |
1543 | # define SYSCALL_RET gr[28] | |
5d83c2b3 ME |
1544 | #elif defined(__powerpc__) |
1545 | # define ARCH_REGS struct pt_regs | |
1546 | # define SYSCALL_NUM gpr[0] | |
1547 | # define SYSCALL_RET gpr[3] | |
b623c4da KC |
1548 | #elif defined(__s390__) |
1549 | # define ARCH_REGS s390_regs | |
1550 | # define SYSCALL_NUM gprs[2] | |
1551 | # define SYSCALL_RET gprs[2] | |
0ce105bf MR |
1552 | #elif defined(__mips__) |
1553 | # define ARCH_REGS struct pt_regs | |
1554 | # define SYSCALL_NUM regs[2] | |
1555 | # define SYSCALL_SYSCALL_NUM regs[4] | |
1556 | # define SYSCALL_RET regs[2] | |
1557 | # define SYSCALL_NUM_RET_SHARE_REG | |
c99ee51a KC |
1558 | #else |
1559 | # error "Do not know how to find your architecture's registers and syscalls" | |
1560 | #endif | |
1561 | ||
a33b2d03 KC |
1562 | /* When the syscall return can't be changed, stub out the tests for it. */ |
1563 | #ifdef SYSCALL_NUM_RET_SHARE_REG | |
1564 | # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action) | |
1565 | #else | |
1566 | # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(val, action) | |
1567 | #endif | |
1568 | ||
4a0b8807 MS |
1569 | /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for |
1570 | * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux). | |
1571 | */ | |
0ce105bf | 1572 | #if defined(__x86_64__) || defined(__i386__) || defined(__mips__) |
4a0b8807 MS |
1573 | #define HAVE_GETREGS |
1574 | #endif | |
1575 | ||
c99ee51a KC |
1576 | /* Architecture-specific syscall fetching routine. */ |
1577 | int get_syscall(struct __test_metadata *_metadata, pid_t tracee) | |
1578 | { | |
c99ee51a | 1579 | ARCH_REGS regs; |
4a0b8807 MS |
1580 | #ifdef HAVE_GETREGS |
1581 | EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, ®s)) { | |
1582 | TH_LOG("PTRACE_GETREGS failed"); | |
1583 | return -1; | |
1584 | } | |
1585 | #else | |
1586 | struct iovec iov; | |
c99ee51a KC |
1587 | |
1588 | iov.iov_base = ®s; | |
1589 | iov.iov_len = sizeof(regs); | |
1590 | EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) { | |
1591 | TH_LOG("PTRACE_GETREGSET failed"); | |
1592 | return -1; | |
1593 | } | |
4a0b8807 | 1594 | #endif |
c99ee51a | 1595 | |
0ce105bf MR |
1596 | #if defined(__mips__) |
1597 | if (regs.SYSCALL_NUM == __NR_O32_Linux) | |
1598 | return regs.SYSCALL_SYSCALL_NUM; | |
1599 | #endif | |
c99ee51a KC |
1600 | return regs.SYSCALL_NUM; |
1601 | } | |
1602 | ||
1603 | /* Architecture-specific syscall changing routine. */ | |
1604 | void change_syscall(struct __test_metadata *_metadata, | |
1605 | pid_t tracee, int syscall) | |
1606 | { | |
c99ee51a KC |
1607 | int ret; |
1608 | ARCH_REGS regs; | |
4a0b8807 MS |
1609 | #ifdef HAVE_GETREGS |
1610 | ret = ptrace(PTRACE_GETREGS, tracee, 0, ®s); | |
1611 | #else | |
1612 | struct iovec iov; | |
c99ee51a KC |
1613 | iov.iov_base = ®s; |
1614 | iov.iov_len = sizeof(regs); | |
1615 | ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov); | |
4a0b8807 | 1616 | #endif |
34a048cc | 1617 | EXPECT_EQ(0, ret) {} |
c99ee51a | 1618 | |
256d0afb | 1619 | #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \ |
64e2a42b | 1620 | defined(__s390__) || defined(__hppa__) |
c99ee51a KC |
1621 | { |
1622 | regs.SYSCALL_NUM = syscall; | |
1623 | } | |
0ce105bf MR |
1624 | #elif defined(__mips__) |
1625 | { | |
1626 | if (regs.SYSCALL_NUM == __NR_O32_Linux) | |
1627 | regs.SYSCALL_SYSCALL_NUM = syscall; | |
1628 | else | |
1629 | regs.SYSCALL_NUM = syscall; | |
1630 | } | |
c99ee51a KC |
1631 | |
1632 | #elif defined(__arm__) | |
1633 | # ifndef PTRACE_SET_SYSCALL | |
1634 | # define PTRACE_SET_SYSCALL 23 | |
1635 | # endif | |
1636 | { | |
1637 | ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall); | |
1638 | EXPECT_EQ(0, ret); | |
1639 | } | |
1640 | ||
256d0afb KC |
1641 | #elif defined(__aarch64__) |
1642 | # ifndef NT_ARM_SYSTEM_CALL | |
1643 | # define NT_ARM_SYSTEM_CALL 0x404 | |
1644 | # endif | |
1645 | { | |
1646 | iov.iov_base = &syscall; | |
1647 | iov.iov_len = sizeof(syscall); | |
1648 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL, | |
1649 | &iov); | |
1650 | EXPECT_EQ(0, ret); | |
1651 | } | |
1652 | ||
c99ee51a KC |
1653 | #else |
1654 | ASSERT_EQ(1, 0) { | |
1655 | TH_LOG("How is the syscall changed on this architecture?"); | |
1656 | } | |
1657 | #endif | |
1658 | ||
1659 | /* If syscall is skipped, change return value. */ | |
1660 | if (syscall == -1) | |
0ce105bf MR |
1661 | #ifdef SYSCALL_NUM_RET_SHARE_REG |
1662 | TH_LOG("Can't modify syscall return on this architecture"); | |
1663 | #else | |
a33b2d03 | 1664 | regs.SYSCALL_RET = EPERM; |
0ce105bf | 1665 | #endif |
c99ee51a | 1666 | |
4a0b8807 MS |
1667 | #ifdef HAVE_GETREGS |
1668 | ret = ptrace(PTRACE_SETREGS, tracee, 0, ®s); | |
1669 | #else | |
256d0afb KC |
1670 | iov.iov_base = ®s; |
1671 | iov.iov_len = sizeof(regs); | |
c99ee51a | 1672 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov); |
4a0b8807 | 1673 | #endif |
c99ee51a KC |
1674 | EXPECT_EQ(0, ret); |
1675 | } | |
1676 | ||
1677 | void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee, | |
1678 | int status, void *args) | |
1679 | { | |
1680 | int ret; | |
1681 | unsigned long msg; | |
1682 | ||
1683 | /* Make sure we got the right message. */ | |
1684 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1685 | EXPECT_EQ(0, ret); | |
1686 | ||
b623c4da | 1687 | /* Validate and take action on expected syscalls. */ |
c99ee51a KC |
1688 | switch (msg) { |
1689 | case 0x1002: | |
1690 | /* change getpid to getppid. */ | |
b623c4da | 1691 | EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1692 | change_syscall(_metadata, tracee, __NR_getppid); |
1693 | break; | |
1694 | case 0x1003: | |
1695 | /* skip gettid. */ | |
b623c4da | 1696 | EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1697 | change_syscall(_metadata, tracee, -1); |
1698 | break; | |
1699 | case 0x1004: | |
1700 | /* do nothing (allow getppid) */ | |
b623c4da | 1701 | EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1702 | break; |
1703 | default: | |
1704 | EXPECT_EQ(0, msg) { | |
1705 | TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg); | |
1706 | kill(tracee, SIGKILL); | |
1707 | } | |
1708 | } | |
1709 | ||
1710 | } | |
1711 | ||
58d0a862 KC |
1712 | void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee, |
1713 | int status, void *args) | |
1714 | { | |
1715 | int ret, nr; | |
1716 | unsigned long msg; | |
1717 | static bool entry; | |
1718 | ||
1719 | /* Make sure we got an empty message. */ | |
1720 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1721 | EXPECT_EQ(0, ret); | |
1722 | EXPECT_EQ(0, msg); | |
1723 | ||
1724 | /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */ | |
1725 | entry = !entry; | |
1726 | if (!entry) | |
1727 | return; | |
1728 | ||
1729 | nr = get_syscall(_metadata, tracee); | |
1730 | ||
1731 | if (nr == __NR_getpid) | |
1732 | change_syscall(_metadata, tracee, __NR_getppid); | |
912ec316 | 1733 | if (nr == __NR_openat) |
a33b2d03 | 1734 | change_syscall(_metadata, tracee, -1); |
58d0a862 KC |
1735 | } |
1736 | ||
c99ee51a KC |
1737 | FIXTURE_DATA(TRACE_syscall) { |
1738 | struct sock_fprog prog; | |
1739 | pid_t tracer, mytid, mypid, parent; | |
1740 | }; | |
1741 | ||
1742 | FIXTURE_SETUP(TRACE_syscall) | |
1743 | { | |
1744 | struct sock_filter filter[] = { | |
1745 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1746 | offsetof(struct seccomp_data, nr)), | |
1747 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
1748 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002), | |
1749 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1), | |
1750 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003), | |
1751 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1752 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004), | |
1753 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1754 | }; | |
1755 | ||
1756 | memset(&self->prog, 0, sizeof(self->prog)); | |
1757 | self->prog.filter = malloc(sizeof(filter)); | |
1758 | ASSERT_NE(NULL, self->prog.filter); | |
1759 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1760 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1761 | ||
1762 | /* Prepare some testable syscall results. */ | |
1763 | self->mytid = syscall(__NR_gettid); | |
1764 | ASSERT_GT(self->mytid, 0); | |
1765 | ASSERT_NE(self->mytid, 1) { | |
1766 | TH_LOG("Running this test as init is not supported. :)"); | |
1767 | } | |
1768 | ||
1769 | self->mypid = getpid(); | |
1770 | ASSERT_GT(self->mypid, 0); | |
1771 | ASSERT_EQ(self->mytid, self->mypid); | |
1772 | ||
1773 | self->parent = getppid(); | |
1774 | ASSERT_GT(self->parent, 0); | |
1775 | ASSERT_NE(self->parent, self->mypid); | |
1776 | ||
1777 | /* Launch tracer. */ | |
58d0a862 KC |
1778 | self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL, |
1779 | false); | |
c99ee51a KC |
1780 | } |
1781 | ||
1782 | FIXTURE_TEARDOWN(TRACE_syscall) | |
1783 | { | |
1784 | teardown_trace_fixture(_metadata, self->tracer); | |
1785 | if (self->prog.filter) | |
1786 | free(self->prog.filter); | |
1787 | } | |
1788 | ||
a33b2d03 KC |
1789 | TEST_F(TRACE_syscall, ptrace_syscall_redirected) |
1790 | { | |
1791 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1792 | teardown_trace_fixture(_metadata, self->tracer); | |
1793 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1794 | true); | |
1795 | ||
1796 | /* Tracer will redirect getpid to getppid. */ | |
1797 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1798 | } | |
1799 | ||
1800 | TEST_F(TRACE_syscall, ptrace_syscall_dropped) | |
1801 | { | |
1802 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1803 | teardown_trace_fixture(_metadata, self->tracer); | |
1804 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1805 | true); | |
1806 | ||
1807 | /* Tracer should skip the open syscall, resulting in EPERM. */ | |
912ec316 | 1808 | EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_openat)); |
a33b2d03 KC |
1809 | } |
1810 | ||
c99ee51a KC |
1811 | TEST_F(TRACE_syscall, syscall_allowed) |
1812 | { | |
1813 | long ret; | |
1814 | ||
1815 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1816 | ASSERT_EQ(0, ret); | |
1817 | ||
1818 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1819 | ASSERT_EQ(0, ret); | |
1820 | ||
1821 | /* getppid works as expected (no changes). */ | |
1822 | EXPECT_EQ(self->parent, syscall(__NR_getppid)); | |
1823 | EXPECT_NE(self->mypid, syscall(__NR_getppid)); | |
1824 | } | |
1825 | ||
1826 | TEST_F(TRACE_syscall, syscall_redirected) | |
1827 | { | |
1828 | long ret; | |
1829 | ||
1830 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1831 | ASSERT_EQ(0, ret); | |
1832 | ||
1833 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1834 | ASSERT_EQ(0, ret); | |
1835 | ||
1836 | /* getpid has been redirected to getppid as expected. */ | |
1837 | EXPECT_EQ(self->parent, syscall(__NR_getpid)); | |
1838 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1839 | } | |
1840 | ||
1841 | TEST_F(TRACE_syscall, syscall_dropped) | |
1842 | { | |
1843 | long ret; | |
1844 | ||
1845 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1846 | ASSERT_EQ(0, ret); | |
1847 | ||
1848 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1849 | ASSERT_EQ(0, ret); | |
1850 | ||
1851 | /* gettid has been skipped and an altered return value stored. */ | |
a33b2d03 | 1852 | EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_gettid)); |
c99ee51a KC |
1853 | EXPECT_NE(self->mytid, syscall(__NR_gettid)); |
1854 | } | |
1855 | ||
58d0a862 KC |
1856 | TEST_F(TRACE_syscall, skip_after_RET_TRACE) |
1857 | { | |
1858 | struct sock_filter filter[] = { | |
1859 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1860 | offsetof(struct seccomp_data, nr)), | |
1861 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1862 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM), | |
1863 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1864 | }; | |
1865 | struct sock_fprog prog = { | |
1866 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1867 | .filter = filter, | |
1868 | }; | |
1869 | long ret; | |
1870 | ||
1871 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1872 | ASSERT_EQ(0, ret); | |
1873 | ||
1874 | /* Install fixture filter. */ | |
1875 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1876 | ASSERT_EQ(0, ret); | |
1877 | ||
1878 | /* Install "errno on getppid" filter. */ | |
1879 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1880 | ASSERT_EQ(0, ret); | |
1881 | ||
1882 | /* Tracer will redirect getpid to getppid, and we should see EPERM. */ | |
a33b2d03 | 1883 | errno = 0; |
58d0a862 KC |
1884 | EXPECT_EQ(-1, syscall(__NR_getpid)); |
1885 | EXPECT_EQ(EPERM, errno); | |
1886 | } | |
1887 | ||
1888 | TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS) | |
1889 | { | |
1890 | struct sock_filter filter[] = { | |
1891 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1892 | offsetof(struct seccomp_data, nr)), | |
1893 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1894 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1895 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1896 | }; | |
1897 | struct sock_fprog prog = { | |
1898 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1899 | .filter = filter, | |
1900 | }; | |
1901 | long ret; | |
1902 | ||
1903 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1904 | ASSERT_EQ(0, ret); | |
1905 | ||
1906 | /* Install fixture filter. */ | |
1907 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1908 | ASSERT_EQ(0, ret); | |
1909 | ||
1910 | /* Install "death on getppid" filter. */ | |
1911 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1912 | ASSERT_EQ(0, ret); | |
1913 | ||
1914 | /* Tracer will redirect getpid to getppid, and we should die. */ | |
1915 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1916 | } | |
1917 | ||
1918 | TEST_F(TRACE_syscall, skip_after_ptrace) | |
1919 | { | |
1920 | struct sock_filter filter[] = { | |
1921 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1922 | offsetof(struct seccomp_data, nr)), | |
1923 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1924 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM), | |
1925 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1926 | }; | |
1927 | struct sock_fprog prog = { | |
1928 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1929 | .filter = filter, | |
1930 | }; | |
1931 | long ret; | |
1932 | ||
1933 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1934 | teardown_trace_fixture(_metadata, self->tracer); | |
1935 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1936 | true); | |
1937 | ||
1938 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1939 | ASSERT_EQ(0, ret); | |
1940 | ||
1941 | /* Install "errno on getppid" filter. */ | |
1942 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1943 | ASSERT_EQ(0, ret); | |
1944 | ||
1945 | /* Tracer will redirect getpid to getppid, and we should see EPERM. */ | |
1946 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1947 | EXPECT_EQ(EPERM, errno); | |
1948 | } | |
1949 | ||
1950 | TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS) | |
1951 | { | |
1952 | struct sock_filter filter[] = { | |
1953 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1954 | offsetof(struct seccomp_data, nr)), | |
1955 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1956 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1957 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1958 | }; | |
1959 | struct sock_fprog prog = { | |
1960 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1961 | .filter = filter, | |
1962 | }; | |
1963 | long ret; | |
1964 | ||
1965 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1966 | teardown_trace_fixture(_metadata, self->tracer); | |
1967 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1968 | true); | |
1969 | ||
1970 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1971 | ASSERT_EQ(0, ret); | |
1972 | ||
1973 | /* Install "death on getppid" filter. */ | |
1974 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1975 | ASSERT_EQ(0, ret); | |
1976 | ||
1977 | /* Tracer will redirect getpid to getppid, and we should die. */ | |
1978 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1979 | } | |
1980 | ||
c99ee51a KC |
1981 | TEST(seccomp_syscall) |
1982 | { | |
1983 | struct sock_filter filter[] = { | |
1984 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1985 | }; | |
1986 | struct sock_fprog prog = { | |
1987 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1988 | .filter = filter, | |
1989 | }; | |
1990 | long ret; | |
1991 | ||
1992 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1993 | ASSERT_EQ(0, ret) { | |
1994 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1995 | } | |
1996 | ||
1997 | /* Reject insane operation. */ | |
1998 | ret = seccomp(-1, 0, &prog); | |
b623c4da KC |
1999 | ASSERT_NE(ENOSYS, errno) { |
2000 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2001 | } | |
c99ee51a KC |
2002 | EXPECT_EQ(EINVAL, errno) { |
2003 | TH_LOG("Did not reject crazy op value!"); | |
2004 | } | |
2005 | ||
2006 | /* Reject strict with flags or pointer. */ | |
2007 | ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL); | |
2008 | EXPECT_EQ(EINVAL, errno) { | |
2009 | TH_LOG("Did not reject mode strict with flags!"); | |
2010 | } | |
2011 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog); | |
2012 | EXPECT_EQ(EINVAL, errno) { | |
2013 | TH_LOG("Did not reject mode strict with uargs!"); | |
2014 | } | |
2015 | ||
2016 | /* Reject insane args for filter. */ | |
2017 | ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog); | |
2018 | EXPECT_EQ(EINVAL, errno) { | |
2019 | TH_LOG("Did not reject crazy filter flags!"); | |
2020 | } | |
2021 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL); | |
2022 | EXPECT_EQ(EFAULT, errno) { | |
2023 | TH_LOG("Did not reject NULL filter!"); | |
2024 | } | |
2025 | ||
2026 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
2027 | EXPECT_EQ(0, errno) { | |
2028 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s", | |
2029 | strerror(errno)); | |
2030 | } | |
2031 | } | |
2032 | ||
2033 | TEST(seccomp_syscall_mode_lock) | |
2034 | { | |
2035 | struct sock_filter filter[] = { | |
2036 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2037 | }; | |
2038 | struct sock_fprog prog = { | |
2039 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2040 | .filter = filter, | |
2041 | }; | |
2042 | long ret; | |
2043 | ||
2044 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
2045 | ASSERT_EQ(0, ret) { | |
2046 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2047 | } | |
2048 | ||
2049 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
2050 | ASSERT_NE(ENOSYS, errno) { |
2051 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2052 | } | |
c99ee51a KC |
2053 | EXPECT_EQ(0, ret) { |
2054 | TH_LOG("Could not install filter!"); | |
2055 | } | |
2056 | ||
2057 | /* Make sure neither entry point will switch to strict. */ | |
2058 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0); | |
2059 | EXPECT_EQ(EINVAL, errno) { | |
2060 | TH_LOG("Switched to mode strict!"); | |
2061 | } | |
2062 | ||
2063 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL); | |
2064 | EXPECT_EQ(EINVAL, errno) { | |
2065 | TH_LOG("Switched to mode strict!"); | |
2066 | } | |
2067 | } | |
2068 | ||
2b7ea5b5 TH |
2069 | /* |
2070 | * Test detection of known and unknown filter flags. Userspace needs to be able | |
2071 | * to check if a filter flag is supported by the current kernel and a good way | |
2072 | * of doing that is by attempting to enter filter mode, with the flag bit in | |
2073 | * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates | |
2074 | * that the flag is valid and EINVAL indicates that the flag is invalid. | |
2075 | */ | |
2076 | TEST(detect_seccomp_filter_flags) | |
2077 | { | |
e66a3997 | 2078 | unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC, |
00a02d0c KC |
2079 | SECCOMP_FILTER_FLAG_LOG, |
2080 | SECCOMP_FILTER_FLAG_SPEC_ALLOW }; | |
2b7ea5b5 TH |
2081 | unsigned int flag, all_flags; |
2082 | int i; | |
2083 | long ret; | |
2084 | ||
2085 | /* Test detection of known-good filter flags */ | |
2086 | for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) { | |
00a02d0c KC |
2087 | int bits = 0; |
2088 | ||
2b7ea5b5 | 2089 | flag = flags[i]; |
00a02d0c KC |
2090 | /* Make sure the flag is a single bit! */ |
2091 | while (flag) { | |
2092 | if (flag & 0x1) | |
2093 | bits ++; | |
2094 | flag >>= 1; | |
2095 | } | |
2096 | ASSERT_EQ(1, bits); | |
2097 | flag = flags[i]; | |
2098 | ||
2b7ea5b5 TH |
2099 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); |
2100 | ASSERT_NE(ENOSYS, errno) { | |
2101 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2102 | } | |
2103 | EXPECT_EQ(-1, ret); | |
2104 | EXPECT_EQ(EFAULT, errno) { | |
2105 | TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!", | |
2106 | flag); | |
2107 | } | |
2108 | ||
2109 | all_flags |= flag; | |
2110 | } | |
2111 | ||
2112 | /* Test detection of all known-good filter flags */ | |
2113 | ret = seccomp(SECCOMP_SET_MODE_FILTER, all_flags, NULL); | |
2114 | EXPECT_EQ(-1, ret); | |
2115 | EXPECT_EQ(EFAULT, errno) { | |
2116 | TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!", | |
2117 | all_flags); | |
2118 | } | |
2119 | ||
2120 | /* Test detection of an unknown filter flag */ | |
2121 | flag = -1; | |
2122 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
2123 | EXPECT_EQ(-1, ret); | |
2124 | EXPECT_EQ(EINVAL, errno) { | |
2125 | TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!", | |
2126 | flag); | |
2127 | } | |
2128 | ||
2129 | /* | |
2130 | * Test detection of an unknown filter flag that may simply need to be | |
2131 | * added to this test | |
2132 | */ | |
2133 | flag = flags[ARRAY_SIZE(flags) - 1] << 1; | |
2134 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
2135 | EXPECT_EQ(-1, ret); | |
2136 | EXPECT_EQ(EINVAL, errno) { | |
2137 | 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?", | |
2138 | flag); | |
2139 | } | |
2140 | } | |
2141 | ||
c99ee51a KC |
2142 | TEST(TSYNC_first) |
2143 | { | |
2144 | struct sock_filter filter[] = { | |
2145 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2146 | }; | |
2147 | struct sock_fprog prog = { | |
2148 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2149 | .filter = filter, | |
2150 | }; | |
2151 | long ret; | |
2152 | ||
2153 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
2154 | ASSERT_EQ(0, ret) { | |
2155 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2156 | } | |
2157 | ||
6c045d07 | 2158 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a | 2159 | &prog); |
b623c4da KC |
2160 | ASSERT_NE(ENOSYS, errno) { |
2161 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2162 | } | |
c99ee51a KC |
2163 | EXPECT_EQ(0, ret) { |
2164 | TH_LOG("Could not install initial filter with TSYNC!"); | |
2165 | } | |
2166 | } | |
2167 | ||
2168 | #define TSYNC_SIBLINGS 2 | |
2169 | struct tsync_sibling { | |
2170 | pthread_t tid; | |
2171 | pid_t system_tid; | |
2172 | sem_t *started; | |
2173 | pthread_cond_t *cond; | |
2174 | pthread_mutex_t *mutex; | |
2175 | int diverge; | |
2176 | int num_waits; | |
2177 | struct sock_fprog *prog; | |
2178 | struct __test_metadata *metadata; | |
2179 | }; | |
2180 | ||
93bd70e3 KC |
2181 | /* |
2182 | * To avoid joining joined threads (which is not allowed by Bionic), | |
2183 | * make sure we both successfully join and clear the tid to skip a | |
2184 | * later join attempt during fixture teardown. Any remaining threads | |
2185 | * will be directly killed during teardown. | |
2186 | */ | |
2187 | #define PTHREAD_JOIN(tid, status) \ | |
2188 | do { \ | |
2189 | int _rc = pthread_join(tid, status); \ | |
2190 | if (_rc) { \ | |
2191 | TH_LOG("pthread_join of tid %u failed: %d\n", \ | |
2192 | (unsigned int)tid, _rc); \ | |
2193 | } else { \ | |
2194 | tid = 0; \ | |
2195 | } \ | |
2196 | } while (0) | |
2197 | ||
c99ee51a KC |
2198 | FIXTURE_DATA(TSYNC) { |
2199 | struct sock_fprog root_prog, apply_prog; | |
2200 | struct tsync_sibling sibling[TSYNC_SIBLINGS]; | |
2201 | sem_t started; | |
2202 | pthread_cond_t cond; | |
2203 | pthread_mutex_t mutex; | |
2204 | int sibling_count; | |
2205 | }; | |
2206 | ||
2207 | FIXTURE_SETUP(TSYNC) | |
2208 | { | |
2209 | struct sock_filter root_filter[] = { | |
2210 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2211 | }; | |
2212 | struct sock_filter apply_filter[] = { | |
2213 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2214 | offsetof(struct seccomp_data, nr)), | |
2215 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
2216 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
2217 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2218 | }; | |
2219 | ||
2220 | memset(&self->root_prog, 0, sizeof(self->root_prog)); | |
2221 | memset(&self->apply_prog, 0, sizeof(self->apply_prog)); | |
2222 | memset(&self->sibling, 0, sizeof(self->sibling)); | |
2223 | self->root_prog.filter = malloc(sizeof(root_filter)); | |
2224 | ASSERT_NE(NULL, self->root_prog.filter); | |
2225 | memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter)); | |
2226 | self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter); | |
2227 | ||
2228 | self->apply_prog.filter = malloc(sizeof(apply_filter)); | |
2229 | ASSERT_NE(NULL, self->apply_prog.filter); | |
2230 | memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter)); | |
2231 | self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter); | |
2232 | ||
2233 | self->sibling_count = 0; | |
2234 | pthread_mutex_init(&self->mutex, NULL); | |
2235 | pthread_cond_init(&self->cond, NULL); | |
2236 | sem_init(&self->started, 0, 0); | |
2237 | self->sibling[0].tid = 0; | |
2238 | self->sibling[0].cond = &self->cond; | |
2239 | self->sibling[0].started = &self->started; | |
2240 | self->sibling[0].mutex = &self->mutex; | |
2241 | self->sibling[0].diverge = 0; | |
2242 | self->sibling[0].num_waits = 1; | |
2243 | self->sibling[0].prog = &self->root_prog; | |
2244 | self->sibling[0].metadata = _metadata; | |
2245 | self->sibling[1].tid = 0; | |
2246 | self->sibling[1].cond = &self->cond; | |
2247 | self->sibling[1].started = &self->started; | |
2248 | self->sibling[1].mutex = &self->mutex; | |
2249 | self->sibling[1].diverge = 0; | |
2250 | self->sibling[1].prog = &self->root_prog; | |
2251 | self->sibling[1].num_waits = 1; | |
2252 | self->sibling[1].metadata = _metadata; | |
2253 | } | |
2254 | ||
2255 | FIXTURE_TEARDOWN(TSYNC) | |
2256 | { | |
2257 | int sib = 0; | |
2258 | ||
2259 | if (self->root_prog.filter) | |
2260 | free(self->root_prog.filter); | |
2261 | if (self->apply_prog.filter) | |
2262 | free(self->apply_prog.filter); | |
2263 | ||
2264 | for ( ; sib < self->sibling_count; ++sib) { | |
2265 | struct tsync_sibling *s = &self->sibling[sib]; | |
c99ee51a KC |
2266 | |
2267 | if (!s->tid) | |
2268 | continue; | |
93bd70e3 KC |
2269 | /* |
2270 | * If a thread is still running, it may be stuck, so hit | |
2271 | * it over the head really hard. | |
2272 | */ | |
2273 | pthread_kill(s->tid, 9); | |
c99ee51a KC |
2274 | } |
2275 | pthread_mutex_destroy(&self->mutex); | |
2276 | pthread_cond_destroy(&self->cond); | |
2277 | sem_destroy(&self->started); | |
2278 | } | |
2279 | ||
2280 | void *tsync_sibling(void *data) | |
2281 | { | |
2282 | long ret = 0; | |
2283 | struct tsync_sibling *me = data; | |
2284 | ||
2285 | me->system_tid = syscall(__NR_gettid); | |
2286 | ||
2287 | pthread_mutex_lock(me->mutex); | |
2288 | if (me->diverge) { | |
2289 | /* Just re-apply the root prog to fork the tree */ | |
2290 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
2291 | me->prog, 0, 0); | |
2292 | } | |
2293 | sem_post(me->started); | |
2294 | /* Return outside of started so parent notices failures. */ | |
2295 | if (ret) { | |
2296 | pthread_mutex_unlock(me->mutex); | |
2297 | return (void *)SIBLING_EXIT_FAILURE; | |
2298 | } | |
2299 | do { | |
2300 | pthread_cond_wait(me->cond, me->mutex); | |
2301 | me->num_waits = me->num_waits - 1; | |
2302 | } while (me->num_waits); | |
2303 | pthread_mutex_unlock(me->mutex); | |
2304 | ||
2305 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0); | |
2306 | if (!ret) | |
2307 | return (void *)SIBLING_EXIT_NEWPRIVS; | |
2308 | read(0, NULL, 0); | |
2309 | return (void *)SIBLING_EXIT_UNKILLED; | |
2310 | } | |
2311 | ||
2312 | void tsync_start_sibling(struct tsync_sibling *sibling) | |
2313 | { | |
2314 | pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling); | |
2315 | } | |
2316 | ||
2317 | TEST_F(TSYNC, siblings_fail_prctl) | |
2318 | { | |
2319 | long ret; | |
2320 | void *status; | |
2321 | struct sock_filter filter[] = { | |
2322 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2323 | offsetof(struct seccomp_data, nr)), | |
2324 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
2325 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL), | |
2326 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2327 | }; | |
2328 | struct sock_fprog prog = { | |
2329 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2330 | .filter = filter, | |
2331 | }; | |
2332 | ||
2333 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2334 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2335 | } | |
2336 | ||
2337 | /* Check prctl failure detection by requesting sib 0 diverge. */ | |
2338 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
2339 | ASSERT_NE(ENOSYS, errno) { |
2340 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2341 | } | |
c99ee51a KC |
2342 | ASSERT_EQ(0, ret) { |
2343 | TH_LOG("setting filter failed"); | |
2344 | } | |
2345 | ||
2346 | self->sibling[0].diverge = 1; | |
2347 | tsync_start_sibling(&self->sibling[0]); | |
2348 | tsync_start_sibling(&self->sibling[1]); | |
2349 | ||
2350 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2351 | sem_wait(&self->started); | |
2352 | self->sibling_count++; | |
2353 | } | |
2354 | ||
2355 | /* Signal the threads to clean up*/ | |
2356 | pthread_mutex_lock(&self->mutex); | |
2357 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2358 | TH_LOG("cond broadcast non-zero"); | |
2359 | } | |
2360 | pthread_mutex_unlock(&self->mutex); | |
2361 | ||
2362 | /* Ensure diverging sibling failed to call prctl. */ | |
93bd70e3 | 2363 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2364 | EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status); |
93bd70e3 | 2365 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2366 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2367 | } | |
2368 | ||
2369 | TEST_F(TSYNC, two_siblings_with_ancestor) | |
2370 | { | |
2371 | long ret; | |
2372 | void *status; | |
2373 | ||
2374 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2375 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2376 | } | |
2377 | ||
2378 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2379 | ASSERT_NE(ENOSYS, errno) { |
2380 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2381 | } | |
c99ee51a KC |
2382 | ASSERT_EQ(0, ret) { |
2383 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2384 | } | |
2385 | tsync_start_sibling(&self->sibling[0]); | |
2386 | tsync_start_sibling(&self->sibling[1]); | |
2387 | ||
2388 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2389 | sem_wait(&self->started); | |
2390 | self->sibling_count++; | |
2391 | } | |
2392 | ||
6c045d07 | 2393 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2394 | &self->apply_prog); |
2395 | ASSERT_EQ(0, ret) { | |
2396 | TH_LOG("Could install filter on all threads!"); | |
2397 | } | |
2398 | /* Tell the siblings to test the policy */ | |
2399 | pthread_mutex_lock(&self->mutex); | |
2400 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2401 | TH_LOG("cond broadcast non-zero"); | |
2402 | } | |
2403 | pthread_mutex_unlock(&self->mutex); | |
2404 | /* Ensure they are both killed and don't exit cleanly. */ | |
93bd70e3 | 2405 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2406 | EXPECT_EQ(0x0, (long)status); |
93bd70e3 | 2407 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2408 | EXPECT_EQ(0x0, (long)status); |
2409 | } | |
2410 | ||
2411 | TEST_F(TSYNC, two_sibling_want_nnp) | |
2412 | { | |
2413 | void *status; | |
2414 | ||
2415 | /* start siblings before any prctl() operations */ | |
2416 | tsync_start_sibling(&self->sibling[0]); | |
2417 | tsync_start_sibling(&self->sibling[1]); | |
2418 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2419 | sem_wait(&self->started); | |
2420 | self->sibling_count++; | |
2421 | } | |
2422 | ||
2423 | /* Tell the siblings to test no policy */ | |
2424 | pthread_mutex_lock(&self->mutex); | |
2425 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2426 | TH_LOG("cond broadcast non-zero"); | |
2427 | } | |
2428 | pthread_mutex_unlock(&self->mutex); | |
2429 | ||
2430 | /* Ensure they are both upset about lacking nnp. */ | |
93bd70e3 | 2431 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2432 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); |
93bd70e3 | 2433 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2434 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); |
2435 | } | |
2436 | ||
2437 | TEST_F(TSYNC, two_siblings_with_no_filter) | |
2438 | { | |
2439 | long ret; | |
2440 | void *status; | |
2441 | ||
2442 | /* start siblings before any prctl() operations */ | |
2443 | tsync_start_sibling(&self->sibling[0]); | |
2444 | tsync_start_sibling(&self->sibling[1]); | |
2445 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2446 | sem_wait(&self->started); | |
2447 | self->sibling_count++; | |
2448 | } | |
2449 | ||
2450 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2451 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2452 | } | |
2453 | ||
6c045d07 | 2454 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a | 2455 | &self->apply_prog); |
b623c4da KC |
2456 | ASSERT_NE(ENOSYS, errno) { |
2457 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2458 | } | |
c99ee51a KC |
2459 | ASSERT_EQ(0, ret) { |
2460 | TH_LOG("Could install filter on all threads!"); | |
2461 | } | |
2462 | ||
2463 | /* Tell the siblings to test the policy */ | |
2464 | pthread_mutex_lock(&self->mutex); | |
2465 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2466 | TH_LOG("cond broadcast non-zero"); | |
2467 | } | |
2468 | pthread_mutex_unlock(&self->mutex); | |
2469 | ||
2470 | /* Ensure they are both killed and don't exit cleanly. */ | |
93bd70e3 | 2471 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2472 | EXPECT_EQ(0x0, (long)status); |
93bd70e3 | 2473 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2474 | EXPECT_EQ(0x0, (long)status); |
2475 | } | |
2476 | ||
2477 | TEST_F(TSYNC, two_siblings_with_one_divergence) | |
2478 | { | |
2479 | long ret; | |
2480 | void *status; | |
2481 | ||
2482 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2483 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2484 | } | |
2485 | ||
2486 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2487 | ASSERT_NE(ENOSYS, errno) { |
2488 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2489 | } | |
c99ee51a KC |
2490 | ASSERT_EQ(0, ret) { |
2491 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2492 | } | |
2493 | self->sibling[0].diverge = 1; | |
2494 | tsync_start_sibling(&self->sibling[0]); | |
2495 | tsync_start_sibling(&self->sibling[1]); | |
2496 | ||
2497 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2498 | sem_wait(&self->started); | |
2499 | self->sibling_count++; | |
2500 | } | |
2501 | ||
6c045d07 | 2502 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2503 | &self->apply_prog); |
2504 | ASSERT_EQ(self->sibling[0].system_tid, ret) { | |
2505 | TH_LOG("Did not fail on diverged sibling."); | |
2506 | } | |
2507 | ||
2508 | /* Wake the threads */ | |
2509 | pthread_mutex_lock(&self->mutex); | |
2510 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2511 | TH_LOG("cond broadcast non-zero"); | |
2512 | } | |
2513 | pthread_mutex_unlock(&self->mutex); | |
2514 | ||
2515 | /* Ensure they are both unkilled. */ | |
93bd70e3 | 2516 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2517 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
93bd70e3 | 2518 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2519 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2520 | } | |
2521 | ||
2522 | TEST_F(TSYNC, two_siblings_not_under_filter) | |
2523 | { | |
2524 | long ret, sib; | |
2525 | void *status; | |
2526 | ||
2527 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2528 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2529 | } | |
2530 | ||
2531 | /* | |
2532 | * Sibling 0 will have its own seccomp policy | |
2533 | * and Sibling 1 will not be under seccomp at | |
2534 | * all. Sibling 1 will enter seccomp and 0 | |
2535 | * will cause failure. | |
2536 | */ | |
2537 | self->sibling[0].diverge = 1; | |
2538 | tsync_start_sibling(&self->sibling[0]); | |
2539 | tsync_start_sibling(&self->sibling[1]); | |
2540 | ||
2541 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2542 | sem_wait(&self->started); | |
2543 | self->sibling_count++; | |
2544 | } | |
2545 | ||
2546 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2547 | ASSERT_NE(ENOSYS, errno) { |
2548 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2549 | } | |
c99ee51a KC |
2550 | ASSERT_EQ(0, ret) { |
2551 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2552 | } | |
2553 | ||
6c045d07 | 2554 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2555 | &self->apply_prog); |
2556 | ASSERT_EQ(ret, self->sibling[0].system_tid) { | |
2557 | TH_LOG("Did not fail on diverged sibling."); | |
2558 | } | |
2559 | sib = 1; | |
2560 | if (ret == self->sibling[0].system_tid) | |
2561 | sib = 0; | |
2562 | ||
2563 | pthread_mutex_lock(&self->mutex); | |
2564 | ||
2565 | /* Increment the other siblings num_waits so we can clean up | |
2566 | * the one we just saw. | |
2567 | */ | |
2568 | self->sibling[!sib].num_waits += 1; | |
2569 | ||
2570 | /* Signal the thread to clean up*/ | |
2571 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2572 | TH_LOG("cond broadcast non-zero"); | |
2573 | } | |
2574 | pthread_mutex_unlock(&self->mutex); | |
93bd70e3 | 2575 | PTHREAD_JOIN(self->sibling[sib].tid, &status); |
c99ee51a KC |
2576 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2577 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2578 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2579 | sleep(0.1); | |
2580 | /* Switch to the remaining sibling */ | |
2581 | sib = !sib; | |
2582 | ||
6c045d07 | 2583 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2584 | &self->apply_prog); |
2585 | ASSERT_EQ(0, ret) { | |
2586 | TH_LOG("Expected the remaining sibling to sync"); | |
2587 | }; | |
2588 | ||
2589 | pthread_mutex_lock(&self->mutex); | |
2590 | ||
2591 | /* If remaining sibling didn't have a chance to wake up during | |
2592 | * the first broadcast, manually reduce the num_waits now. | |
2593 | */ | |
2594 | if (self->sibling[sib].num_waits > 1) | |
2595 | self->sibling[sib].num_waits = 1; | |
2596 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2597 | TH_LOG("cond broadcast non-zero"); | |
2598 | } | |
2599 | pthread_mutex_unlock(&self->mutex); | |
93bd70e3 | 2600 | PTHREAD_JOIN(self->sibling[sib].tid, &status); |
c99ee51a KC |
2601 | EXPECT_EQ(0, (long)status); |
2602 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2603 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2604 | sleep(0.1); | |
2605 | ||
6c045d07 | 2606 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2607 | &self->apply_prog); |
2608 | ASSERT_EQ(0, ret); /* just us chickens */ | |
2609 | } | |
2610 | ||
2611 | /* Make sure restarted syscalls are seen directly as "restart_syscall". */ | |
2612 | TEST(syscall_restart) | |
2613 | { | |
2614 | long ret; | |
2615 | unsigned long msg; | |
2616 | pid_t child_pid; | |
2617 | int pipefd[2]; | |
2618 | int status; | |
2619 | siginfo_t info = { }; | |
2620 | struct sock_filter filter[] = { | |
2621 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2622 | offsetof(struct seccomp_data, nr)), | |
2623 | ||
2624 | #ifdef __NR_sigreturn | |
2625 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0), | |
2626 | #endif | |
2627 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0), | |
2628 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0), | |
2629 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0), | |
256d0afb | 2630 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0), |
c99ee51a KC |
2631 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0), |
2632 | ||
2633 | /* Allow __NR_write for easy logging. */ | |
2634 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1), | |
2635 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2636 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
256d0afb KC |
2637 | /* The nanosleep jump target. */ |
2638 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100), | |
2639 | /* The restart_syscall jump target. */ | |
2640 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200), | |
c99ee51a KC |
2641 | }; |
2642 | struct sock_fprog prog = { | |
2643 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2644 | .filter = filter, | |
2645 | }; | |
256d0afb KC |
2646 | #if defined(__arm__) |
2647 | struct utsname utsbuf; | |
2648 | #endif | |
c99ee51a KC |
2649 | |
2650 | ASSERT_EQ(0, pipe(pipefd)); | |
2651 | ||
2652 | child_pid = fork(); | |
2653 | ASSERT_LE(0, child_pid); | |
2654 | if (child_pid == 0) { | |
2655 | /* Child uses EXPECT not ASSERT to deliver status correctly. */ | |
2656 | char buf = ' '; | |
256d0afb | 2657 | struct timespec timeout = { }; |
c99ee51a KC |
2658 | |
2659 | /* Attach parent as tracer and stop. */ | |
2660 | EXPECT_EQ(0, ptrace(PTRACE_TRACEME)); | |
2661 | EXPECT_EQ(0, raise(SIGSTOP)); | |
2662 | ||
2663 | EXPECT_EQ(0, close(pipefd[1])); | |
2664 | ||
2665 | EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2666 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2667 | } | |
2668 | ||
2669 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
2670 | EXPECT_EQ(0, ret) { | |
2671 | TH_LOG("Failed to install filter!"); | |
2672 | } | |
2673 | ||
2674 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2675 | TH_LOG("Failed to read() sync from parent"); | |
2676 | } | |
2677 | EXPECT_EQ('.', buf) { | |
2678 | TH_LOG("Failed to get sync data from read()"); | |
2679 | } | |
2680 | ||
256d0afb KC |
2681 | /* Start nanosleep to be interrupted. */ |
2682 | timeout.tv_sec = 1; | |
c99ee51a | 2683 | errno = 0; |
256d0afb KC |
2684 | EXPECT_EQ(0, nanosleep(&timeout, NULL)) { |
2685 | TH_LOG("Call to nanosleep() failed (errno %d)", errno); | |
c99ee51a KC |
2686 | } |
2687 | ||
2688 | /* Read final sync from parent. */ | |
2689 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2690 | TH_LOG("Failed final read() from parent"); | |
2691 | } | |
2692 | EXPECT_EQ('!', buf) { | |
2693 | TH_LOG("Failed to get final data from read()"); | |
2694 | } | |
2695 | ||
2696 | /* Directly report the status of our test harness results. */ | |
2697 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS | |
2698 | : EXIT_FAILURE); | |
2699 | } | |
2700 | EXPECT_EQ(0, close(pipefd[0])); | |
2701 | ||
2702 | /* Attach to child, setup options, and release. */ | |
2703 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2704 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2705 | ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL, | |
2706 | PTRACE_O_TRACESECCOMP)); | |
2707 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2708 | ASSERT_EQ(1, write(pipefd[1], ".", 1)); | |
2709 | ||
256d0afb | 2710 | /* Wait for nanosleep() to start. */ |
c99ee51a KC |
2711 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); |
2712 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2713 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2714 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2715 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
2716 | ASSERT_EQ(0x100, msg); | |
256d0afb | 2717 | EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid)); |
c99ee51a KC |
2718 | |
2719 | /* Might as well check siginfo for sanity while we're here. */ | |
2720 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2721 | ASSERT_EQ(SIGTRAP, info.si_signo); | |
2722 | ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code); | |
2723 | EXPECT_EQ(0, info.si_errno); | |
2724 | EXPECT_EQ(getuid(), info.si_uid); | |
2725 | /* Verify signal delivery came from child (seccomp-triggered). */ | |
2726 | EXPECT_EQ(child_pid, info.si_pid); | |
2727 | ||
256d0afb | 2728 | /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */ |
c99ee51a KC |
2729 | ASSERT_EQ(0, kill(child_pid, SIGSTOP)); |
2730 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2731 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2732 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2733 | ASSERT_EQ(SIGSTOP, WSTOPSIG(status)); | |
2734 | /* Verify signal delivery came from parent now. */ | |
2735 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2736 | EXPECT_EQ(getpid(), info.si_pid); | |
2737 | ||
256d0afb | 2738 | /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */ |
c99ee51a KC |
2739 | ASSERT_EQ(0, kill(child_pid, SIGCONT)); |
2740 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2741 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2742 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2743 | ASSERT_EQ(SIGCONT, WSTOPSIG(status)); | |
2744 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2745 | ||
2746 | /* Wait for restart_syscall() to start. */ | |
2747 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2748 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2749 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2750 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2751 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
256d0afb | 2752 | |
c99ee51a KC |
2753 | ASSERT_EQ(0x200, msg); |
2754 | ret = get_syscall(_metadata, child_pid); | |
2755 | #if defined(__arm__) | |
256d0afb KC |
2756 | /* |
2757 | * FIXME: | |
2758 | * - native ARM registers do NOT expose true syscall. | |
2759 | * - compat ARM registers on ARM64 DO expose true syscall. | |
2760 | */ | |
2761 | ASSERT_EQ(0, uname(&utsbuf)); | |
2762 | if (strncmp(utsbuf.machine, "arm", 3) == 0) { | |
2763 | EXPECT_EQ(__NR_nanosleep, ret); | |
2764 | } else | |
c99ee51a | 2765 | #endif |
256d0afb KC |
2766 | { |
2767 | EXPECT_EQ(__NR_restart_syscall, ret); | |
2768 | } | |
c99ee51a | 2769 | |
256d0afb | 2770 | /* Write again to end test. */ |
c99ee51a KC |
2771 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); |
2772 | ASSERT_EQ(1, write(pipefd[1], "!", 1)); | |
2773 | EXPECT_EQ(0, close(pipefd[1])); | |
2774 | ||
2775 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2776 | if (WIFSIGNALED(status) || WEXITSTATUS(status)) | |
2777 | _metadata->passed = 0; | |
2778 | } | |
2779 | ||
e66a3997 TH |
2780 | TEST_SIGNAL(filter_flag_log, SIGSYS) |
2781 | { | |
2782 | struct sock_filter allow_filter[] = { | |
2783 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2784 | }; | |
2785 | struct sock_filter kill_filter[] = { | |
2786 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2787 | offsetof(struct seccomp_data, nr)), | |
2788 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
2789 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
2790 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2791 | }; | |
2792 | struct sock_fprog allow_prog = { | |
2793 | .len = (unsigned short)ARRAY_SIZE(allow_filter), | |
2794 | .filter = allow_filter, | |
2795 | }; | |
2796 | struct sock_fprog kill_prog = { | |
2797 | .len = (unsigned short)ARRAY_SIZE(kill_filter), | |
2798 | .filter = kill_filter, | |
2799 | }; | |
2800 | long ret; | |
2801 | pid_t parent = getppid(); | |
2802 | ||
2803 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
2804 | ASSERT_EQ(0, ret); | |
2805 | ||
2806 | /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */ | |
2807 | ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG, | |
2808 | &allow_prog); | |
2809 | ASSERT_NE(ENOSYS, errno) { | |
2810 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2811 | } | |
2812 | EXPECT_NE(0, ret) { | |
2813 | TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!"); | |
2814 | } | |
2815 | EXPECT_EQ(EINVAL, errno) { | |
2816 | TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!"); | |
2817 | } | |
2818 | ||
2819 | /* Verify that a simple, permissive filter can be added with no flags */ | |
2820 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog); | |
2821 | EXPECT_EQ(0, ret); | |
2822 | ||
2823 | /* See if the same filter can be added with the FILTER_FLAG_LOG flag */ | |
2824 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, | |
2825 | &allow_prog); | |
2826 | ASSERT_NE(EINVAL, errno) { | |
2827 | TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!"); | |
2828 | } | |
2829 | EXPECT_EQ(0, ret); | |
2830 | ||
2831 | /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */ | |
2832 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, | |
2833 | &kill_prog); | |
2834 | EXPECT_EQ(0, ret); | |
2835 | ||
2836 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
2837 | /* getpid() should never return. */ | |
2838 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
2839 | } | |
2840 | ||
d612b1fd TH |
2841 | TEST(get_action_avail) |
2842 | { | |
fd76875c | 2843 | __u32 actions[] = { SECCOMP_RET_KILL_THREAD, SECCOMP_RET_TRAP, |
d612b1fd | 2844 | SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE, |
59f5cf44 | 2845 | SECCOMP_RET_LOG, SECCOMP_RET_ALLOW }; |
d612b1fd TH |
2846 | __u32 unknown_action = 0x10000000U; |
2847 | int i; | |
2848 | long ret; | |
2849 | ||
2850 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]); | |
2851 | ASSERT_NE(ENOSYS, errno) { | |
2852 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2853 | } | |
2854 | ASSERT_NE(EINVAL, errno) { | |
2855 | TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!"); | |
2856 | } | |
2857 | EXPECT_EQ(ret, 0); | |
2858 | ||
2859 | for (i = 0; i < ARRAY_SIZE(actions); i++) { | |
2860 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]); | |
2861 | EXPECT_EQ(ret, 0) { | |
2862 | TH_LOG("Expected action (0x%X) not available!", | |
2863 | actions[i]); | |
2864 | } | |
2865 | } | |
2866 | ||
2867 | /* Check that an unknown action is handled properly (EOPNOTSUPP) */ | |
2868 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action); | |
2869 | EXPECT_EQ(ret, -1); | |
2870 | EXPECT_EQ(errno, EOPNOTSUPP); | |
2871 | } | |
2872 | ||
d057dc4e TA |
2873 | TEST(get_metadata) |
2874 | { | |
2875 | pid_t pid; | |
2876 | int pipefd[2]; | |
2877 | char buf; | |
2878 | struct seccomp_metadata md; | |
6c3b6d50 | 2879 | long ret; |
d057dc4e TA |
2880 | |
2881 | ASSERT_EQ(0, pipe(pipefd)); | |
2882 | ||
2883 | pid = fork(); | |
2884 | ASSERT_GE(pid, 0); | |
2885 | if (pid == 0) { | |
2886 | struct sock_filter filter[] = { | |
2887 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2888 | }; | |
2889 | struct sock_fprog prog = { | |
2890 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2891 | .filter = filter, | |
2892 | }; | |
2893 | ||
2894 | /* one with log, one without */ | |
2895 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, | |
2896 | SECCOMP_FILTER_FLAG_LOG, &prog)); | |
2897 | ASSERT_EQ(0, seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog)); | |
2898 | ||
2899 | ASSERT_EQ(0, close(pipefd[0])); | |
2900 | ASSERT_EQ(1, write(pipefd[1], "1", 1)); | |
2901 | ASSERT_EQ(0, close(pipefd[1])); | |
2902 | ||
2903 | while (1) | |
2904 | sleep(100); | |
2905 | } | |
2906 | ||
2907 | ASSERT_EQ(0, close(pipefd[1])); | |
2908 | ASSERT_EQ(1, read(pipefd[0], &buf, 1)); | |
2909 | ||
2910 | ASSERT_EQ(0, ptrace(PTRACE_ATTACH, pid)); | |
2911 | ASSERT_EQ(pid, waitpid(pid, NULL, 0)); | |
2912 | ||
6c3b6d50 KC |
2913 | /* Past here must not use ASSERT or child process is never killed. */ |
2914 | ||
d057dc4e | 2915 | md.filter_off = 0; |
6c3b6d50 KC |
2916 | errno = 0; |
2917 | ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md); | |
2918 | EXPECT_EQ(sizeof(md), ret) { | |
2919 | if (errno == EINVAL) | |
2920 | XFAIL(goto skip, "Kernel does not support PTRACE_SECCOMP_GET_METADATA (missing CONFIG_CHECKPOINT_RESTORE?)"); | |
2921 | } | |
2922 | ||
d057dc4e TA |
2923 | EXPECT_EQ(md.flags, SECCOMP_FILTER_FLAG_LOG); |
2924 | EXPECT_EQ(md.filter_off, 0); | |
2925 | ||
2926 | md.filter_off = 1; | |
6c3b6d50 KC |
2927 | ret = ptrace(PTRACE_SECCOMP_GET_METADATA, pid, sizeof(md), &md); |
2928 | EXPECT_EQ(sizeof(md), ret); | |
d057dc4e TA |
2929 | EXPECT_EQ(md.flags, 0); |
2930 | EXPECT_EQ(md.filter_off, 1); | |
2931 | ||
6c3b6d50 | 2932 | skip: |
d057dc4e TA |
2933 | ASSERT_EQ(0, kill(pid, SIGKILL)); |
2934 | } | |
2935 | ||
c99ee51a KC |
2936 | /* |
2937 | * TODO: | |
2938 | * - add microbenchmarks | |
2939 | * - expand NNP testing | |
2940 | * - better arch-specific TRACE and TRAP handlers. | |
2941 | * - endianness checking when appropriate | |
2942 | * - 64-bit arg prodding | |
2943 | * - arch value testing (x86 modes especially) | |
e66a3997 | 2944 | * - verify that FILTER_FLAG_LOG filters generate log messages |
59f5cf44 | 2945 | * - verify that RET_LOG generates log messages |
c99ee51a KC |
2946 | * - ... |
2947 | */ | |
2948 | ||
2949 | TEST_HARNESS_MAIN |