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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> |
c99ee51a KC |
9 | #include <asm/siginfo.h> |
10 | #define __have_siginfo_t 1 | |
11 | #define __have_sigval_t 1 | |
12 | #define __have_sigevent_t 1 | |
13 | ||
14 | #include <errno.h> | |
15 | #include <linux/filter.h> | |
16 | #include <sys/prctl.h> | |
17 | #include <sys/ptrace.h> | |
18 | #include <sys/user.h> | |
19 | #include <linux/prctl.h> | |
20 | #include <linux/ptrace.h> | |
21 | #include <linux/seccomp.h> | |
c99ee51a KC |
22 | #include <pthread.h> |
23 | #include <semaphore.h> | |
24 | #include <signal.h> | |
25 | #include <stddef.h> | |
26 | #include <stdbool.h> | |
27 | #include <string.h> | |
256d0afb | 28 | #include <time.h> |
c99ee51a KC |
29 | #include <linux/elf.h> |
30 | #include <sys/uio.h> | |
256d0afb | 31 | #include <sys/utsname.h> |
fd88d16c RS |
32 | #include <sys/fcntl.h> |
33 | #include <sys/mman.h> | |
34 | #include <sys/times.h> | |
c99ee51a KC |
35 | |
36 | #define _GNU_SOURCE | |
37 | #include <unistd.h> | |
38 | #include <sys/syscall.h> | |
39 | ||
0b40808a | 40 | #include "../kselftest_harness.h" |
c99ee51a KC |
41 | |
42 | #ifndef PR_SET_PTRACER | |
43 | # define PR_SET_PTRACER 0x59616d61 | |
44 | #endif | |
45 | ||
46 | #ifndef PR_SET_NO_NEW_PRIVS | |
47 | #define PR_SET_NO_NEW_PRIVS 38 | |
48 | #define PR_GET_NO_NEW_PRIVS 39 | |
49 | #endif | |
50 | ||
51 | #ifndef PR_SECCOMP_EXT | |
52 | #define PR_SECCOMP_EXT 43 | |
53 | #endif | |
54 | ||
55 | #ifndef SECCOMP_EXT_ACT | |
56 | #define SECCOMP_EXT_ACT 1 | |
57 | #endif | |
58 | ||
59 | #ifndef SECCOMP_EXT_ACT_TSYNC | |
60 | #define SECCOMP_EXT_ACT_TSYNC 1 | |
61 | #endif | |
62 | ||
63 | #ifndef SECCOMP_MODE_STRICT | |
64 | #define SECCOMP_MODE_STRICT 1 | |
65 | #endif | |
66 | ||
67 | #ifndef SECCOMP_MODE_FILTER | |
68 | #define SECCOMP_MODE_FILTER 2 | |
69 | #endif | |
70 | ||
71 | #ifndef SECCOMP_RET_KILL | |
72 | #define SECCOMP_RET_KILL 0x00000000U /* kill the task immediately */ | |
73 | #define SECCOMP_RET_TRAP 0x00030000U /* disallow and force a SIGSYS */ | |
74 | #define SECCOMP_RET_ERRNO 0x00050000U /* returns an errno */ | |
75 | #define SECCOMP_RET_TRACE 0x7ff00000U /* pass to a tracer or disallow */ | |
76 | #define SECCOMP_RET_ALLOW 0x7fff0000U /* allow */ | |
77 | ||
78 | /* Masks for the return value sections. */ | |
79 | #define SECCOMP_RET_ACTION 0x7fff0000U | |
80 | #define SECCOMP_RET_DATA 0x0000ffffU | |
81 | ||
82 | struct seccomp_data { | |
83 | int nr; | |
84 | __u32 arch; | |
85 | __u64 instruction_pointer; | |
86 | __u64 args[6]; | |
87 | }; | |
88 | #endif | |
89 | ||
c385d0db | 90 | #if __BYTE_ORDER == __LITTLE_ENDIAN |
c99ee51a | 91 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n])) |
c385d0db ME |
92 | #elif __BYTE_ORDER == __BIG_ENDIAN |
93 | #define syscall_arg(_n) (offsetof(struct seccomp_data, args[_n]) + sizeof(__u32)) | |
94 | #else | |
95 | #error "wut? Unknown __BYTE_ORDER?!" | |
96 | #endif | |
c99ee51a KC |
97 | |
98 | #define SIBLING_EXIT_UNKILLED 0xbadbeef | |
99 | #define SIBLING_EXIT_FAILURE 0xbadface | |
100 | #define SIBLING_EXIT_NEWPRIVS 0xbadfeed | |
101 | ||
102 | TEST(mode_strict_support) | |
103 | { | |
104 | long ret; | |
105 | ||
106 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
107 | ASSERT_EQ(0, ret) { | |
108 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
109 | } | |
110 | syscall(__NR_exit, 1); | |
111 | } | |
112 | ||
113 | TEST_SIGNAL(mode_strict_cannot_call_prctl, SIGKILL) | |
114 | { | |
115 | long ret; | |
116 | ||
117 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, NULL, NULL); | |
118 | ASSERT_EQ(0, ret) { | |
119 | TH_LOG("Kernel does not support CONFIG_SECCOMP"); | |
120 | } | |
121 | syscall(__NR_prctl, PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
122 | NULL, NULL, NULL); | |
123 | EXPECT_FALSE(true) { | |
124 | TH_LOG("Unreachable!"); | |
125 | } | |
126 | } | |
127 | ||
128 | /* Note! This doesn't test no new privs behavior */ | |
129 | TEST(no_new_privs_support) | |
130 | { | |
131 | long ret; | |
132 | ||
133 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
134 | EXPECT_EQ(0, ret) { | |
135 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
136 | } | |
137 | } | |
138 | ||
f3f6e306 | 139 | /* Tests kernel support by checking for a copy_from_user() fault on NULL. */ |
c99ee51a KC |
140 | TEST(mode_filter_support) |
141 | { | |
142 | long ret; | |
143 | ||
144 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
145 | ASSERT_EQ(0, ret) { | |
146 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
147 | } | |
148 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, NULL, NULL, NULL); | |
149 | EXPECT_EQ(-1, ret); | |
150 | EXPECT_EQ(EFAULT, errno) { | |
151 | TH_LOG("Kernel does not support CONFIG_SECCOMP_FILTER!"); | |
152 | } | |
153 | } | |
154 | ||
155 | TEST(mode_filter_without_nnp) | |
156 | { | |
157 | struct sock_filter filter[] = { | |
158 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
159 | }; | |
160 | struct sock_fprog prog = { | |
161 | .len = (unsigned short)ARRAY_SIZE(filter), | |
162 | .filter = filter, | |
163 | }; | |
164 | long ret; | |
165 | ||
166 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, NULL, 0, 0); | |
167 | ASSERT_LE(0, ret) { | |
168 | TH_LOG("Expected 0 or unsupported for NO_NEW_PRIVS"); | |
169 | } | |
170 | errno = 0; | |
171 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
172 | /* Succeeds with CAP_SYS_ADMIN, fails without */ | |
173 | /* TODO(wad) check caps not euid */ | |
174 | if (geteuid()) { | |
175 | EXPECT_EQ(-1, ret); | |
176 | EXPECT_EQ(EACCES, errno); | |
177 | } else { | |
178 | EXPECT_EQ(0, ret); | |
179 | } | |
180 | } | |
181 | ||
182 | #define MAX_INSNS_PER_PATH 32768 | |
183 | ||
184 | TEST(filter_size_limits) | |
185 | { | |
186 | int i; | |
187 | int count = BPF_MAXINSNS + 1; | |
188 | struct sock_filter allow[] = { | |
189 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
190 | }; | |
191 | struct sock_filter *filter; | |
192 | struct sock_fprog prog = { }; | |
193 | long ret; | |
194 | ||
195 | filter = calloc(count, sizeof(*filter)); | |
196 | ASSERT_NE(NULL, filter); | |
197 | ||
198 | for (i = 0; i < count; i++) | |
199 | filter[i] = allow[0]; | |
200 | ||
201 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
202 | ASSERT_EQ(0, ret); | |
203 | ||
204 | prog.filter = filter; | |
205 | prog.len = count; | |
206 | ||
207 | /* Too many filter instructions in a single filter. */ | |
208 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
209 | ASSERT_NE(0, ret) { | |
210 | TH_LOG("Installing %d insn filter was allowed", prog.len); | |
211 | } | |
212 | ||
213 | /* One less is okay, though. */ | |
214 | prog.len -= 1; | |
215 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
216 | ASSERT_EQ(0, ret) { | |
217 | TH_LOG("Installing %d insn filter wasn't allowed", prog.len); | |
218 | } | |
219 | } | |
220 | ||
221 | TEST(filter_chain_limits) | |
222 | { | |
223 | int i; | |
224 | int count = BPF_MAXINSNS; | |
225 | struct sock_filter allow[] = { | |
226 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
227 | }; | |
228 | struct sock_filter *filter; | |
229 | struct sock_fprog prog = { }; | |
230 | long ret; | |
231 | ||
232 | filter = calloc(count, sizeof(*filter)); | |
233 | ASSERT_NE(NULL, filter); | |
234 | ||
235 | for (i = 0; i < count; i++) | |
236 | filter[i] = allow[0]; | |
237 | ||
238 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
239 | ASSERT_EQ(0, ret); | |
240 | ||
241 | prog.filter = filter; | |
242 | prog.len = 1; | |
243 | ||
244 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
245 | ASSERT_EQ(0, ret); | |
246 | ||
247 | prog.len = count; | |
248 | ||
249 | /* Too many total filter instructions. */ | |
250 | for (i = 0; i < MAX_INSNS_PER_PATH; i++) { | |
251 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
252 | if (ret != 0) | |
253 | break; | |
254 | } | |
255 | ASSERT_NE(0, ret) { | |
256 | TH_LOG("Allowed %d %d-insn filters (total with penalties:%d)", | |
257 | i, count, i * (count + 4)); | |
258 | } | |
259 | } | |
260 | ||
261 | TEST(mode_filter_cannot_move_to_strict) | |
262 | { | |
263 | struct sock_filter filter[] = { | |
264 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
265 | }; | |
266 | struct sock_fprog prog = { | |
267 | .len = (unsigned short)ARRAY_SIZE(filter), | |
268 | .filter = filter, | |
269 | }; | |
270 | long ret; | |
271 | ||
272 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
273 | ASSERT_EQ(0, ret); | |
274 | ||
275 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
276 | ASSERT_EQ(0, ret); | |
277 | ||
278 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, NULL, 0, 0); | |
279 | EXPECT_EQ(-1, ret); | |
280 | EXPECT_EQ(EINVAL, errno); | |
281 | } | |
282 | ||
283 | ||
284 | TEST(mode_filter_get_seccomp) | |
285 | { | |
286 | struct sock_filter filter[] = { | |
287 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
288 | }; | |
289 | struct sock_fprog prog = { | |
290 | .len = (unsigned short)ARRAY_SIZE(filter), | |
291 | .filter = filter, | |
292 | }; | |
293 | long ret; | |
294 | ||
295 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
296 | ASSERT_EQ(0, ret); | |
297 | ||
298 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
299 | EXPECT_EQ(0, ret); | |
300 | ||
301 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
302 | ASSERT_EQ(0, ret); | |
303 | ||
304 | ret = prctl(PR_GET_SECCOMP, 0, 0, 0, 0); | |
305 | EXPECT_EQ(2, ret); | |
306 | } | |
307 | ||
308 | ||
309 | TEST(ALLOW_all) | |
310 | { | |
311 | struct sock_filter filter[] = { | |
312 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
313 | }; | |
314 | struct sock_fprog prog = { | |
315 | .len = (unsigned short)ARRAY_SIZE(filter), | |
316 | .filter = filter, | |
317 | }; | |
318 | long ret; | |
319 | ||
320 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
321 | ASSERT_EQ(0, ret); | |
322 | ||
323 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
324 | ASSERT_EQ(0, ret); | |
325 | } | |
326 | ||
327 | TEST(empty_prog) | |
328 | { | |
329 | struct sock_filter filter[] = { | |
330 | }; | |
331 | struct sock_fprog prog = { | |
332 | .len = (unsigned short)ARRAY_SIZE(filter), | |
333 | .filter = filter, | |
334 | }; | |
335 | long ret; | |
336 | ||
337 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
338 | ASSERT_EQ(0, ret); | |
339 | ||
340 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
341 | EXPECT_EQ(-1, ret); | |
342 | EXPECT_EQ(EINVAL, errno); | |
343 | } | |
344 | ||
345 | TEST_SIGNAL(unknown_ret_is_kill_inside, SIGSYS) | |
346 | { | |
347 | struct sock_filter filter[] = { | |
348 | BPF_STMT(BPF_RET|BPF_K, 0x10000000U), | |
349 | }; | |
350 | struct sock_fprog prog = { | |
351 | .len = (unsigned short)ARRAY_SIZE(filter), | |
352 | .filter = filter, | |
353 | }; | |
354 | long ret; | |
355 | ||
356 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
357 | ASSERT_EQ(0, ret); | |
358 | ||
359 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
360 | ASSERT_EQ(0, ret); | |
361 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
362 | TH_LOG("getpid() shouldn't ever return"); | |
363 | } | |
364 | } | |
365 | ||
366 | /* return code >= 0x80000000 is unused. */ | |
367 | TEST_SIGNAL(unknown_ret_is_kill_above_allow, SIGSYS) | |
368 | { | |
369 | struct sock_filter filter[] = { | |
370 | BPF_STMT(BPF_RET|BPF_K, 0x90000000U), | |
371 | }; | |
372 | struct sock_fprog prog = { | |
373 | .len = (unsigned short)ARRAY_SIZE(filter), | |
374 | .filter = filter, | |
375 | }; | |
376 | long ret; | |
377 | ||
378 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
379 | ASSERT_EQ(0, ret); | |
380 | ||
381 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
382 | ASSERT_EQ(0, ret); | |
383 | EXPECT_EQ(0, syscall(__NR_getpid)) { | |
384 | TH_LOG("getpid() shouldn't ever return"); | |
385 | } | |
386 | } | |
387 | ||
388 | TEST_SIGNAL(KILL_all, SIGSYS) | |
389 | { | |
390 | struct sock_filter filter[] = { | |
391 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
392 | }; | |
393 | struct sock_fprog prog = { | |
394 | .len = (unsigned short)ARRAY_SIZE(filter), | |
395 | .filter = filter, | |
396 | }; | |
397 | long ret; | |
398 | ||
399 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
400 | ASSERT_EQ(0, ret); | |
401 | ||
402 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
403 | ASSERT_EQ(0, ret); | |
404 | } | |
405 | ||
406 | TEST_SIGNAL(KILL_one, SIGSYS) | |
407 | { | |
408 | struct sock_filter filter[] = { | |
409 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
410 | offsetof(struct seccomp_data, nr)), | |
411 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
412 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
413 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
414 | }; | |
415 | struct sock_fprog prog = { | |
416 | .len = (unsigned short)ARRAY_SIZE(filter), | |
417 | .filter = filter, | |
418 | }; | |
419 | long ret; | |
420 | pid_t parent = getppid(); | |
421 | ||
422 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
423 | ASSERT_EQ(0, ret); | |
424 | ||
425 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
426 | ASSERT_EQ(0, ret); | |
427 | ||
428 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
429 | /* getpid() should never return. */ | |
430 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
431 | } | |
432 | ||
433 | TEST_SIGNAL(KILL_one_arg_one, SIGSYS) | |
434 | { | |
fd88d16c | 435 | void *fatal_address; |
c99ee51a KC |
436 | struct sock_filter filter[] = { |
437 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
438 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 439 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_times, 1, 0), |
c99ee51a KC |
440 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
441 | /* Only both with lower 32-bit for now. */ | |
442 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(0)), | |
fd88d16c RS |
443 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, |
444 | (unsigned long)&fatal_address, 0, 1), | |
c99ee51a KC |
445 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), |
446 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
447 | }; | |
448 | struct sock_fprog prog = { | |
449 | .len = (unsigned short)ARRAY_SIZE(filter), | |
450 | .filter = filter, | |
451 | }; | |
452 | long ret; | |
453 | pid_t parent = getppid(); | |
fd88d16c RS |
454 | struct tms timebuf; |
455 | clock_t clock = times(&timebuf); | |
c99ee51a KC |
456 | |
457 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
458 | ASSERT_EQ(0, ret); | |
459 | ||
460 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
461 | ASSERT_EQ(0, ret); | |
462 | ||
463 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
fd88d16c RS |
464 | EXPECT_LE(clock, syscall(__NR_times, &timebuf)); |
465 | /* times() should never return. */ | |
466 | EXPECT_EQ(0, syscall(__NR_times, &fatal_address)); | |
c99ee51a KC |
467 | } |
468 | ||
469 | TEST_SIGNAL(KILL_one_arg_six, SIGSYS) | |
470 | { | |
fd88d16c RS |
471 | #ifndef __NR_mmap2 |
472 | int sysno = __NR_mmap; | |
473 | #else | |
474 | int sysno = __NR_mmap2; | |
475 | #endif | |
c99ee51a KC |
476 | struct sock_filter filter[] = { |
477 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
478 | offsetof(struct seccomp_data, nr)), | |
fd88d16c | 479 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, sysno, 1, 0), |
c99ee51a KC |
480 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), |
481 | /* Only both with lower 32-bit for now. */ | |
482 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(5)), | |
483 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 0x0C0FFEE, 0, 1), | |
484 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
485 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
486 | }; | |
487 | struct sock_fprog prog = { | |
488 | .len = (unsigned short)ARRAY_SIZE(filter), | |
489 | .filter = filter, | |
490 | }; | |
491 | long ret; | |
492 | pid_t parent = getppid(); | |
fd88d16c RS |
493 | int fd; |
494 | void *map1, *map2; | |
2ce47b44 BJZ |
495 | int page_size = sysconf(_SC_PAGESIZE); |
496 | ||
497 | ASSERT_LT(0, page_size); | |
c99ee51a KC |
498 | |
499 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
500 | ASSERT_EQ(0, ret); | |
501 | ||
502 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
503 | ASSERT_EQ(0, ret); | |
504 | ||
fd88d16c RS |
505 | fd = open("/dev/zero", O_RDONLY); |
506 | ASSERT_NE(-1, fd); | |
507 | ||
c99ee51a | 508 | EXPECT_EQ(parent, syscall(__NR_getppid)); |
fd88d16c | 509 | map1 = (void *)syscall(sysno, |
2ce47b44 | 510 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, page_size); |
fd88d16c RS |
511 | EXPECT_NE(MAP_FAILED, map1); |
512 | /* mmap2() should never return. */ | |
513 | map2 = (void *)syscall(sysno, | |
2ce47b44 | 514 | NULL, page_size, PROT_READ, MAP_PRIVATE, fd, 0x0C0FFEE); |
fd88d16c RS |
515 | EXPECT_EQ(MAP_FAILED, map2); |
516 | ||
517 | /* The test failed, so clean up the resources. */ | |
2ce47b44 BJZ |
518 | munmap(map1, page_size); |
519 | munmap(map2, page_size); | |
fd88d16c | 520 | close(fd); |
c99ee51a KC |
521 | } |
522 | ||
523 | /* TODO(wad) add 64-bit versus 32-bit arg tests. */ | |
524 | TEST(arg_out_of_range) | |
525 | { | |
526 | struct sock_filter filter[] = { | |
527 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, syscall_arg(6)), | |
528 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
529 | }; | |
530 | struct sock_fprog prog = { | |
531 | .len = (unsigned short)ARRAY_SIZE(filter), | |
532 | .filter = filter, | |
533 | }; | |
534 | long ret; | |
535 | ||
536 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
537 | ASSERT_EQ(0, ret); | |
538 | ||
539 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog); | |
540 | EXPECT_EQ(-1, ret); | |
541 | EXPECT_EQ(EINVAL, errno); | |
542 | } | |
543 | ||
f3f6e306 KC |
544 | #define ERRNO_FILTER(name, errno) \ |
545 | struct sock_filter _read_filter_##name[] = { \ | |
546 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, \ | |
547 | offsetof(struct seccomp_data, nr)), \ | |
548 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), \ | |
549 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | errno), \ | |
550 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), \ | |
551 | }; \ | |
552 | struct sock_fprog prog_##name = { \ | |
553 | .len = (unsigned short)ARRAY_SIZE(_read_filter_##name), \ | |
554 | .filter = _read_filter_##name, \ | |
555 | } | |
556 | ||
557 | /* Make sure basic errno values are correctly passed through a filter. */ | |
c99ee51a KC |
558 | TEST(ERRNO_valid) |
559 | { | |
f3f6e306 | 560 | ERRNO_FILTER(valid, E2BIG); |
c99ee51a KC |
561 | long ret; |
562 | pid_t parent = getppid(); | |
563 | ||
564 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
565 | ASSERT_EQ(0, ret); | |
566 | ||
f3f6e306 | 567 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_valid); |
c99ee51a KC |
568 | ASSERT_EQ(0, ret); |
569 | ||
570 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
571 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
572 | EXPECT_EQ(E2BIG, errno); | |
573 | } | |
574 | ||
f3f6e306 | 575 | /* Make sure an errno of zero is correctly handled by the arch code. */ |
c99ee51a KC |
576 | TEST(ERRNO_zero) |
577 | { | |
f3f6e306 | 578 | ERRNO_FILTER(zero, 0); |
c99ee51a KC |
579 | long ret; |
580 | pid_t parent = getppid(); | |
581 | ||
582 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
583 | ASSERT_EQ(0, ret); | |
584 | ||
f3f6e306 | 585 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_zero); |
c99ee51a KC |
586 | ASSERT_EQ(0, ret); |
587 | ||
588 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
589 | /* "errno" of 0 is ok. */ | |
590 | EXPECT_EQ(0, read(0, NULL, 0)); | |
591 | } | |
592 | ||
f3f6e306 KC |
593 | /* |
594 | * The SECCOMP_RET_DATA mask is 16 bits wide, but errno is smaller. | |
595 | * This tests that the errno value gets capped correctly, fixed by | |
596 | * 580c57f10768 ("seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO"). | |
597 | */ | |
c99ee51a KC |
598 | TEST(ERRNO_capped) |
599 | { | |
f3f6e306 | 600 | ERRNO_FILTER(capped, 4096); |
c99ee51a KC |
601 | long ret; |
602 | pid_t parent = getppid(); | |
603 | ||
604 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
605 | ASSERT_EQ(0, ret); | |
606 | ||
f3f6e306 | 607 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_capped); |
c99ee51a KC |
608 | ASSERT_EQ(0, ret); |
609 | ||
610 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
611 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
612 | EXPECT_EQ(4095, errno); | |
613 | } | |
614 | ||
f3f6e306 KC |
615 | /* |
616 | * Filters are processed in reverse order: last applied is executed first. | |
617 | * Since only the SECCOMP_RET_ACTION mask is tested for return values, the | |
618 | * SECCOMP_RET_DATA mask results will follow the most recently applied | |
619 | * matching filter return (and not the lowest or highest value). | |
620 | */ | |
621 | TEST(ERRNO_order) | |
622 | { | |
623 | ERRNO_FILTER(first, 11); | |
624 | ERRNO_FILTER(second, 13); | |
625 | ERRNO_FILTER(third, 12); | |
626 | long ret; | |
627 | pid_t parent = getppid(); | |
628 | ||
629 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
630 | ASSERT_EQ(0, ret); | |
631 | ||
632 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_first); | |
633 | ASSERT_EQ(0, ret); | |
634 | ||
635 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_second); | |
636 | ASSERT_EQ(0, ret); | |
637 | ||
638 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog_third); | |
639 | ASSERT_EQ(0, ret); | |
640 | ||
641 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
642 | EXPECT_EQ(-1, read(0, NULL, 0)); | |
643 | EXPECT_EQ(12, errno); | |
644 | } | |
645 | ||
c99ee51a KC |
646 | FIXTURE_DATA(TRAP) { |
647 | struct sock_fprog prog; | |
648 | }; | |
649 | ||
650 | FIXTURE_SETUP(TRAP) | |
651 | { | |
652 | struct sock_filter filter[] = { | |
653 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
654 | offsetof(struct seccomp_data, nr)), | |
655 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
656 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
657 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
658 | }; | |
659 | ||
660 | memset(&self->prog, 0, sizeof(self->prog)); | |
661 | self->prog.filter = malloc(sizeof(filter)); | |
662 | ASSERT_NE(NULL, self->prog.filter); | |
663 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
664 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
665 | } | |
666 | ||
667 | FIXTURE_TEARDOWN(TRAP) | |
668 | { | |
669 | if (self->prog.filter) | |
670 | free(self->prog.filter); | |
671 | } | |
672 | ||
673 | TEST_F_SIGNAL(TRAP, dfl, SIGSYS) | |
674 | { | |
675 | long ret; | |
676 | ||
677 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
678 | ASSERT_EQ(0, ret); | |
679 | ||
680 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
681 | ASSERT_EQ(0, ret); | |
682 | syscall(__NR_getpid); | |
683 | } | |
684 | ||
685 | /* Ensure that SIGSYS overrides SIG_IGN */ | |
686 | TEST_F_SIGNAL(TRAP, ign, SIGSYS) | |
687 | { | |
688 | long ret; | |
689 | ||
690 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
691 | ASSERT_EQ(0, ret); | |
692 | ||
693 | signal(SIGSYS, SIG_IGN); | |
694 | ||
695 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
696 | ASSERT_EQ(0, ret); | |
697 | syscall(__NR_getpid); | |
698 | } | |
699 | ||
700 | static struct siginfo TRAP_info; | |
701 | static volatile int TRAP_nr; | |
702 | static void TRAP_action(int nr, siginfo_t *info, void *void_context) | |
703 | { | |
704 | memcpy(&TRAP_info, info, sizeof(TRAP_info)); | |
705 | TRAP_nr = nr; | |
706 | } | |
707 | ||
708 | TEST_F(TRAP, handler) | |
709 | { | |
710 | int ret, test; | |
711 | struct sigaction act; | |
712 | sigset_t mask; | |
713 | ||
714 | memset(&act, 0, sizeof(act)); | |
715 | sigemptyset(&mask); | |
716 | sigaddset(&mask, SIGSYS); | |
717 | ||
718 | act.sa_sigaction = &TRAP_action; | |
719 | act.sa_flags = SA_SIGINFO; | |
720 | ret = sigaction(SIGSYS, &act, NULL); | |
721 | ASSERT_EQ(0, ret) { | |
722 | TH_LOG("sigaction failed"); | |
723 | } | |
724 | ret = sigprocmask(SIG_UNBLOCK, &mask, NULL); | |
725 | ASSERT_EQ(0, ret) { | |
726 | TH_LOG("sigprocmask failed"); | |
727 | } | |
728 | ||
729 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
730 | ASSERT_EQ(0, ret); | |
731 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog); | |
732 | ASSERT_EQ(0, ret); | |
733 | TRAP_nr = 0; | |
734 | memset(&TRAP_info, 0, sizeof(TRAP_info)); | |
735 | /* Expect the registers to be rolled back. (nr = error) may vary | |
736 | * based on arch. */ | |
737 | ret = syscall(__NR_getpid); | |
738 | /* Silence gcc warning about volatile. */ | |
739 | test = TRAP_nr; | |
740 | EXPECT_EQ(SIGSYS, test); | |
741 | struct local_sigsys { | |
742 | void *_call_addr; /* calling user insn */ | |
743 | int _syscall; /* triggering system call number */ | |
744 | unsigned int _arch; /* AUDIT_ARCH_* of syscall */ | |
745 | } *sigsys = (struct local_sigsys *) | |
746 | #ifdef si_syscall | |
747 | &(TRAP_info.si_call_addr); | |
748 | #else | |
749 | &TRAP_info.si_pid; | |
750 | #endif | |
751 | EXPECT_EQ(__NR_getpid, sigsys->_syscall); | |
752 | /* Make sure arch is non-zero. */ | |
753 | EXPECT_NE(0, sigsys->_arch); | |
754 | EXPECT_NE(0, (unsigned long)sigsys->_call_addr); | |
755 | } | |
756 | ||
757 | FIXTURE_DATA(precedence) { | |
758 | struct sock_fprog allow; | |
759 | struct sock_fprog trace; | |
760 | struct sock_fprog error; | |
761 | struct sock_fprog trap; | |
762 | struct sock_fprog kill; | |
763 | }; | |
764 | ||
765 | FIXTURE_SETUP(precedence) | |
766 | { | |
767 | struct sock_filter allow_insns[] = { | |
768 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
769 | }; | |
770 | struct sock_filter trace_insns[] = { | |
771 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
772 | offsetof(struct seccomp_data, nr)), | |
773 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
774 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
775 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE), | |
776 | }; | |
777 | struct sock_filter error_insns[] = { | |
778 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
779 | offsetof(struct seccomp_data, nr)), | |
780 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
781 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
782 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO), | |
783 | }; | |
784 | struct sock_filter trap_insns[] = { | |
785 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
786 | offsetof(struct seccomp_data, nr)), | |
787 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
788 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
789 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP), | |
790 | }; | |
791 | struct sock_filter kill_insns[] = { | |
792 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
793 | offsetof(struct seccomp_data, nr)), | |
794 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 1, 0), | |
795 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
796 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
797 | }; | |
798 | ||
799 | memset(self, 0, sizeof(*self)); | |
800 | #define FILTER_ALLOC(_x) \ | |
801 | self->_x.filter = malloc(sizeof(_x##_insns)); \ | |
802 | ASSERT_NE(NULL, self->_x.filter); \ | |
803 | memcpy(self->_x.filter, &_x##_insns, sizeof(_x##_insns)); \ | |
804 | self->_x.len = (unsigned short)ARRAY_SIZE(_x##_insns) | |
805 | FILTER_ALLOC(allow); | |
806 | FILTER_ALLOC(trace); | |
807 | FILTER_ALLOC(error); | |
808 | FILTER_ALLOC(trap); | |
809 | FILTER_ALLOC(kill); | |
810 | } | |
811 | ||
812 | FIXTURE_TEARDOWN(precedence) | |
813 | { | |
814 | #define FILTER_FREE(_x) if (self->_x.filter) free(self->_x.filter) | |
815 | FILTER_FREE(allow); | |
816 | FILTER_FREE(trace); | |
817 | FILTER_FREE(error); | |
818 | FILTER_FREE(trap); | |
819 | FILTER_FREE(kill); | |
820 | } | |
821 | ||
822 | TEST_F(precedence, allow_ok) | |
823 | { | |
824 | pid_t parent, res = 0; | |
825 | long ret; | |
826 | ||
827 | parent = getppid(); | |
828 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
829 | ASSERT_EQ(0, ret); | |
830 | ||
831 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
832 | ASSERT_EQ(0, ret); | |
833 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
834 | ASSERT_EQ(0, ret); | |
835 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
836 | ASSERT_EQ(0, ret); | |
837 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
838 | ASSERT_EQ(0, ret); | |
839 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
840 | ASSERT_EQ(0, ret); | |
841 | /* Should work just fine. */ | |
842 | res = syscall(__NR_getppid); | |
843 | EXPECT_EQ(parent, res); | |
844 | } | |
845 | ||
846 | TEST_F_SIGNAL(precedence, kill_is_highest, SIGSYS) | |
847 | { | |
848 | pid_t parent, res = 0; | |
849 | long ret; | |
850 | ||
851 | parent = getppid(); | |
852 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
853 | ASSERT_EQ(0, ret); | |
854 | ||
855 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
856 | ASSERT_EQ(0, ret); | |
857 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
858 | ASSERT_EQ(0, ret); | |
859 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
860 | ASSERT_EQ(0, ret); | |
861 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
862 | ASSERT_EQ(0, ret); | |
863 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
864 | ASSERT_EQ(0, ret); | |
865 | /* Should work just fine. */ | |
866 | res = syscall(__NR_getppid); | |
867 | EXPECT_EQ(parent, res); | |
868 | /* getpid() should never return. */ | |
869 | res = syscall(__NR_getpid); | |
870 | EXPECT_EQ(0, res); | |
871 | } | |
872 | ||
873 | TEST_F_SIGNAL(precedence, kill_is_highest_in_any_order, SIGSYS) | |
874 | { | |
875 | pid_t parent; | |
876 | long ret; | |
877 | ||
878 | parent = getppid(); | |
879 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
880 | ASSERT_EQ(0, ret); | |
881 | ||
882 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
883 | ASSERT_EQ(0, ret); | |
884 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->kill); | |
885 | ASSERT_EQ(0, ret); | |
886 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
887 | ASSERT_EQ(0, ret); | |
888 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
889 | ASSERT_EQ(0, ret); | |
890 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
891 | ASSERT_EQ(0, ret); | |
892 | /* Should work just fine. */ | |
893 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
894 | /* getpid() should never return. */ | |
895 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
896 | } | |
897 | ||
898 | TEST_F_SIGNAL(precedence, trap_is_second, SIGSYS) | |
899 | { | |
900 | pid_t parent; | |
901 | long ret; | |
902 | ||
903 | parent = getppid(); | |
904 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
905 | ASSERT_EQ(0, ret); | |
906 | ||
907 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
908 | ASSERT_EQ(0, ret); | |
909 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
910 | ASSERT_EQ(0, ret); | |
911 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
912 | ASSERT_EQ(0, ret); | |
913 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
914 | ASSERT_EQ(0, ret); | |
915 | /* Should work just fine. */ | |
916 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
917 | /* getpid() should never return. */ | |
918 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
919 | } | |
920 | ||
921 | TEST_F_SIGNAL(precedence, trap_is_second_in_any_order, SIGSYS) | |
922 | { | |
923 | pid_t parent; | |
924 | long ret; | |
925 | ||
926 | parent = getppid(); | |
927 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
928 | ASSERT_EQ(0, ret); | |
929 | ||
930 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
931 | ASSERT_EQ(0, ret); | |
932 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trap); | |
933 | ASSERT_EQ(0, ret); | |
934 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
935 | ASSERT_EQ(0, ret); | |
936 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
937 | ASSERT_EQ(0, ret); | |
938 | /* Should work just fine. */ | |
939 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
940 | /* getpid() should never return. */ | |
941 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
942 | } | |
943 | ||
944 | TEST_F(precedence, errno_is_third) | |
945 | { | |
946 | pid_t parent; | |
947 | long ret; | |
948 | ||
949 | parent = getppid(); | |
950 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
951 | ASSERT_EQ(0, ret); | |
952 | ||
953 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
954 | ASSERT_EQ(0, ret); | |
955 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
956 | ASSERT_EQ(0, ret); | |
957 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
958 | ASSERT_EQ(0, ret); | |
959 | /* Should work just fine. */ | |
960 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
961 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
962 | } | |
963 | ||
964 | TEST_F(precedence, errno_is_third_in_any_order) | |
965 | { | |
966 | pid_t parent; | |
967 | long ret; | |
968 | ||
969 | parent = getppid(); | |
970 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
971 | ASSERT_EQ(0, ret); | |
972 | ||
973 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->error); | |
974 | ASSERT_EQ(0, ret); | |
975 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
976 | ASSERT_EQ(0, ret); | |
977 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
978 | ASSERT_EQ(0, ret); | |
979 | /* Should work just fine. */ | |
980 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
981 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
982 | } | |
983 | ||
984 | TEST_F(precedence, trace_is_fourth) | |
985 | { | |
986 | pid_t parent; | |
987 | long ret; | |
988 | ||
989 | parent = getppid(); | |
990 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
991 | ASSERT_EQ(0, ret); | |
992 | ||
993 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
994 | ASSERT_EQ(0, ret); | |
995 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
996 | ASSERT_EQ(0, ret); | |
997 | /* Should work just fine. */ | |
998 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
999 | /* No ptracer */ | |
1000 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1001 | } | |
1002 | ||
1003 | TEST_F(precedence, trace_is_fourth_in_any_order) | |
1004 | { | |
1005 | pid_t parent; | |
1006 | long ret; | |
1007 | ||
1008 | parent = getppid(); | |
1009 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1010 | ASSERT_EQ(0, ret); | |
1011 | ||
1012 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->trace); | |
1013 | ASSERT_EQ(0, ret); | |
1014 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->allow); | |
1015 | ASSERT_EQ(0, ret); | |
1016 | /* Should work just fine. */ | |
1017 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
1018 | /* No ptracer */ | |
1019 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1020 | } | |
1021 | ||
1022 | #ifndef PTRACE_O_TRACESECCOMP | |
1023 | #define PTRACE_O_TRACESECCOMP 0x00000080 | |
1024 | #endif | |
1025 | ||
1026 | /* Catch the Ubuntu 12.04 value error. */ | |
1027 | #if PTRACE_EVENT_SECCOMP != 7 | |
1028 | #undef PTRACE_EVENT_SECCOMP | |
1029 | #endif | |
1030 | ||
1031 | #ifndef PTRACE_EVENT_SECCOMP | |
1032 | #define PTRACE_EVENT_SECCOMP 7 | |
1033 | #endif | |
1034 | ||
1035 | #define IS_SECCOMP_EVENT(status) ((status >> 16) == PTRACE_EVENT_SECCOMP) | |
1036 | bool tracer_running; | |
1037 | void tracer_stop(int sig) | |
1038 | { | |
1039 | tracer_running = false; | |
1040 | } | |
1041 | ||
1042 | typedef void tracer_func_t(struct __test_metadata *_metadata, | |
1043 | pid_t tracee, int status, void *args); | |
1044 | ||
58d0a862 KC |
1045 | void start_tracer(struct __test_metadata *_metadata, int fd, pid_t tracee, |
1046 | tracer_func_t tracer_func, void *args, bool ptrace_syscall) | |
c99ee51a KC |
1047 | { |
1048 | int ret = -1; | |
1049 | struct sigaction action = { | |
1050 | .sa_handler = tracer_stop, | |
1051 | }; | |
1052 | ||
1053 | /* Allow external shutdown. */ | |
1054 | tracer_running = true; | |
1055 | ASSERT_EQ(0, sigaction(SIGUSR1, &action, NULL)); | |
1056 | ||
1057 | errno = 0; | |
1058 | while (ret == -1 && errno != EINVAL) | |
1059 | ret = ptrace(PTRACE_ATTACH, tracee, NULL, 0); | |
1060 | ASSERT_EQ(0, ret) { | |
1061 | kill(tracee, SIGKILL); | |
1062 | } | |
1063 | /* Wait for attach stop */ | |
1064 | wait(NULL); | |
1065 | ||
58d0a862 KC |
1066 | ret = ptrace(PTRACE_SETOPTIONS, tracee, NULL, ptrace_syscall ? |
1067 | PTRACE_O_TRACESYSGOOD : | |
1068 | PTRACE_O_TRACESECCOMP); | |
c99ee51a KC |
1069 | ASSERT_EQ(0, ret) { |
1070 | TH_LOG("Failed to set PTRACE_O_TRACESECCOMP"); | |
1071 | kill(tracee, SIGKILL); | |
1072 | } | |
58d0a862 KC |
1073 | ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT, |
1074 | tracee, NULL, 0); | |
1075 | ASSERT_EQ(0, ret); | |
c99ee51a KC |
1076 | |
1077 | /* Unblock the tracee */ | |
1078 | ASSERT_EQ(1, write(fd, "A", 1)); | |
1079 | ASSERT_EQ(0, close(fd)); | |
1080 | ||
1081 | /* Run until we're shut down. Must assert to stop execution. */ | |
1082 | while (tracer_running) { | |
1083 | int status; | |
1084 | ||
1085 | if (wait(&status) != tracee) | |
1086 | continue; | |
1087 | if (WIFSIGNALED(status) || WIFEXITED(status)) | |
1088 | /* Child is dead. Time to go. */ | |
1089 | return; | |
1090 | ||
58d0a862 KC |
1091 | /* Check if this is a seccomp event. */ |
1092 | ASSERT_EQ(!ptrace_syscall, IS_SECCOMP_EVENT(status)); | |
c99ee51a KC |
1093 | |
1094 | tracer_func(_metadata, tracee, status, args); | |
1095 | ||
58d0a862 KC |
1096 | ret = ptrace(ptrace_syscall ? PTRACE_SYSCALL : PTRACE_CONT, |
1097 | tracee, NULL, 0); | |
c99ee51a KC |
1098 | ASSERT_EQ(0, ret); |
1099 | } | |
1100 | /* Directly report the status of our test harness results. */ | |
1101 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS : EXIT_FAILURE); | |
1102 | } | |
1103 | ||
1104 | /* Common tracer setup/teardown functions. */ | |
1105 | void cont_handler(int num) | |
1106 | { } | |
1107 | pid_t setup_trace_fixture(struct __test_metadata *_metadata, | |
58d0a862 | 1108 | tracer_func_t func, void *args, bool ptrace_syscall) |
c99ee51a KC |
1109 | { |
1110 | char sync; | |
1111 | int pipefd[2]; | |
1112 | pid_t tracer_pid; | |
1113 | pid_t tracee = getpid(); | |
1114 | ||
1115 | /* Setup a pipe for clean synchronization. */ | |
1116 | ASSERT_EQ(0, pipe(pipefd)); | |
1117 | ||
1118 | /* Fork a child which we'll promote to tracer */ | |
1119 | tracer_pid = fork(); | |
1120 | ASSERT_LE(0, tracer_pid); | |
1121 | signal(SIGALRM, cont_handler); | |
1122 | if (tracer_pid == 0) { | |
1123 | close(pipefd[0]); | |
58d0a862 KC |
1124 | start_tracer(_metadata, pipefd[1], tracee, func, args, |
1125 | ptrace_syscall); | |
c99ee51a KC |
1126 | syscall(__NR_exit, 0); |
1127 | } | |
1128 | close(pipefd[1]); | |
1129 | prctl(PR_SET_PTRACER, tracer_pid, 0, 0, 0); | |
1130 | read(pipefd[0], &sync, 1); | |
1131 | close(pipefd[0]); | |
1132 | ||
1133 | return tracer_pid; | |
1134 | } | |
1135 | void teardown_trace_fixture(struct __test_metadata *_metadata, | |
1136 | pid_t tracer) | |
1137 | { | |
1138 | if (tracer) { | |
1139 | int status; | |
1140 | /* | |
1141 | * Extract the exit code from the other process and | |
1142 | * adopt it for ourselves in case its asserts failed. | |
1143 | */ | |
1144 | ASSERT_EQ(0, kill(tracer, SIGUSR1)); | |
1145 | ASSERT_EQ(tracer, waitpid(tracer, &status, 0)); | |
1146 | if (WEXITSTATUS(status)) | |
1147 | _metadata->passed = 0; | |
1148 | } | |
1149 | } | |
1150 | ||
1151 | /* "poke" tracer arguments and function. */ | |
1152 | struct tracer_args_poke_t { | |
1153 | unsigned long poke_addr; | |
1154 | }; | |
1155 | ||
1156 | void tracer_poke(struct __test_metadata *_metadata, pid_t tracee, int status, | |
1157 | void *args) | |
1158 | { | |
1159 | int ret; | |
1160 | unsigned long msg; | |
1161 | struct tracer_args_poke_t *info = (struct tracer_args_poke_t *)args; | |
1162 | ||
1163 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1164 | EXPECT_EQ(0, ret); | |
1165 | /* If this fails, don't try to recover. */ | |
1166 | ASSERT_EQ(0x1001, msg) { | |
1167 | kill(tracee, SIGKILL); | |
1168 | } | |
1169 | /* | |
1170 | * Poke in the message. | |
1171 | * Registers are not touched to try to keep this relatively arch | |
1172 | * agnostic. | |
1173 | */ | |
1174 | ret = ptrace(PTRACE_POKEDATA, tracee, info->poke_addr, 0x1001); | |
1175 | EXPECT_EQ(0, ret); | |
1176 | } | |
1177 | ||
1178 | FIXTURE_DATA(TRACE_poke) { | |
1179 | struct sock_fprog prog; | |
1180 | pid_t tracer; | |
1181 | long poked; | |
1182 | struct tracer_args_poke_t tracer_args; | |
1183 | }; | |
1184 | ||
1185 | FIXTURE_SETUP(TRACE_poke) | |
1186 | { | |
1187 | struct sock_filter filter[] = { | |
1188 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1189 | offsetof(struct seccomp_data, nr)), | |
1190 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
1191 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1001), | |
1192 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1193 | }; | |
1194 | ||
1195 | self->poked = 0; | |
1196 | memset(&self->prog, 0, sizeof(self->prog)); | |
1197 | self->prog.filter = malloc(sizeof(filter)); | |
1198 | ASSERT_NE(NULL, self->prog.filter); | |
1199 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1200 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1201 | ||
1202 | /* Set up tracer args. */ | |
1203 | self->tracer_args.poke_addr = (unsigned long)&self->poked; | |
1204 | ||
1205 | /* Launch tracer. */ | |
1206 | self->tracer = setup_trace_fixture(_metadata, tracer_poke, | |
58d0a862 | 1207 | &self->tracer_args, false); |
c99ee51a KC |
1208 | } |
1209 | ||
1210 | FIXTURE_TEARDOWN(TRACE_poke) | |
1211 | { | |
1212 | teardown_trace_fixture(_metadata, self->tracer); | |
1213 | if (self->prog.filter) | |
1214 | free(self->prog.filter); | |
1215 | } | |
1216 | ||
1217 | TEST_F(TRACE_poke, read_has_side_effects) | |
1218 | { | |
1219 | ssize_t ret; | |
1220 | ||
1221 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1222 | ASSERT_EQ(0, ret); | |
1223 | ||
1224 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1225 | ASSERT_EQ(0, ret); | |
1226 | ||
1227 | EXPECT_EQ(0, self->poked); | |
1228 | ret = read(-1, NULL, 0); | |
1229 | EXPECT_EQ(-1, ret); | |
1230 | EXPECT_EQ(0x1001, self->poked); | |
1231 | } | |
1232 | ||
1233 | TEST_F(TRACE_poke, getpid_runs_normally) | |
1234 | { | |
1235 | long ret; | |
1236 | ||
1237 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1238 | ASSERT_EQ(0, ret); | |
1239 | ||
1240 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1241 | ASSERT_EQ(0, ret); | |
1242 | ||
1243 | EXPECT_EQ(0, self->poked); | |
1244 | EXPECT_NE(0, syscall(__NR_getpid)); | |
1245 | EXPECT_EQ(0, self->poked); | |
1246 | } | |
1247 | ||
1248 | #if defined(__x86_64__) | |
1249 | # define ARCH_REGS struct user_regs_struct | |
1250 | # define SYSCALL_NUM orig_rax | |
1251 | # define SYSCALL_RET rax | |
1252 | #elif defined(__i386__) | |
1253 | # define ARCH_REGS struct user_regs_struct | |
1254 | # define SYSCALL_NUM orig_eax | |
1255 | # define SYSCALL_RET eax | |
1256 | #elif defined(__arm__) | |
1257 | # define ARCH_REGS struct pt_regs | |
1258 | # define SYSCALL_NUM ARM_r7 | |
1259 | # define SYSCALL_RET ARM_r0 | |
1260 | #elif defined(__aarch64__) | |
1261 | # define ARCH_REGS struct user_pt_regs | |
1262 | # define SYSCALL_NUM regs[8] | |
1263 | # define SYSCALL_RET regs[0] | |
64e2a42b HD |
1264 | #elif defined(__hppa__) |
1265 | # define ARCH_REGS struct user_regs_struct | |
1266 | # define SYSCALL_NUM gr[20] | |
1267 | # define SYSCALL_RET gr[28] | |
5d83c2b3 ME |
1268 | #elif defined(__powerpc__) |
1269 | # define ARCH_REGS struct pt_regs | |
1270 | # define SYSCALL_NUM gpr[0] | |
1271 | # define SYSCALL_RET gpr[3] | |
b623c4da KC |
1272 | #elif defined(__s390__) |
1273 | # define ARCH_REGS s390_regs | |
1274 | # define SYSCALL_NUM gprs[2] | |
1275 | # define SYSCALL_RET gprs[2] | |
0ce105bf MR |
1276 | #elif defined(__mips__) |
1277 | # define ARCH_REGS struct pt_regs | |
1278 | # define SYSCALL_NUM regs[2] | |
1279 | # define SYSCALL_SYSCALL_NUM regs[4] | |
1280 | # define SYSCALL_RET regs[2] | |
1281 | # define SYSCALL_NUM_RET_SHARE_REG | |
c99ee51a KC |
1282 | #else |
1283 | # error "Do not know how to find your architecture's registers and syscalls" | |
1284 | #endif | |
1285 | ||
a33b2d03 KC |
1286 | /* When the syscall return can't be changed, stub out the tests for it. */ |
1287 | #ifdef SYSCALL_NUM_RET_SHARE_REG | |
1288 | # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(-1, action) | |
1289 | #else | |
1290 | # define EXPECT_SYSCALL_RETURN(val, action) EXPECT_EQ(val, action) | |
1291 | #endif | |
1292 | ||
4a0b8807 MS |
1293 | /* Use PTRACE_GETREGS and PTRACE_SETREGS when available. This is useful for |
1294 | * architectures without HAVE_ARCH_TRACEHOOK (e.g. User-mode Linux). | |
1295 | */ | |
0ce105bf | 1296 | #if defined(__x86_64__) || defined(__i386__) || defined(__mips__) |
4a0b8807 MS |
1297 | #define HAVE_GETREGS |
1298 | #endif | |
1299 | ||
c99ee51a KC |
1300 | /* Architecture-specific syscall fetching routine. */ |
1301 | int get_syscall(struct __test_metadata *_metadata, pid_t tracee) | |
1302 | { | |
c99ee51a | 1303 | ARCH_REGS regs; |
4a0b8807 MS |
1304 | #ifdef HAVE_GETREGS |
1305 | EXPECT_EQ(0, ptrace(PTRACE_GETREGS, tracee, 0, ®s)) { | |
1306 | TH_LOG("PTRACE_GETREGS failed"); | |
1307 | return -1; | |
1308 | } | |
1309 | #else | |
1310 | struct iovec iov; | |
c99ee51a KC |
1311 | |
1312 | iov.iov_base = ®s; | |
1313 | iov.iov_len = sizeof(regs); | |
1314 | EXPECT_EQ(0, ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov)) { | |
1315 | TH_LOG("PTRACE_GETREGSET failed"); | |
1316 | return -1; | |
1317 | } | |
4a0b8807 | 1318 | #endif |
c99ee51a | 1319 | |
0ce105bf MR |
1320 | #if defined(__mips__) |
1321 | if (regs.SYSCALL_NUM == __NR_O32_Linux) | |
1322 | return regs.SYSCALL_SYSCALL_NUM; | |
1323 | #endif | |
c99ee51a KC |
1324 | return regs.SYSCALL_NUM; |
1325 | } | |
1326 | ||
1327 | /* Architecture-specific syscall changing routine. */ | |
1328 | void change_syscall(struct __test_metadata *_metadata, | |
1329 | pid_t tracee, int syscall) | |
1330 | { | |
c99ee51a KC |
1331 | int ret; |
1332 | ARCH_REGS regs; | |
4a0b8807 MS |
1333 | #ifdef HAVE_GETREGS |
1334 | ret = ptrace(PTRACE_GETREGS, tracee, 0, ®s); | |
1335 | #else | |
1336 | struct iovec iov; | |
c99ee51a KC |
1337 | iov.iov_base = ®s; |
1338 | iov.iov_len = sizeof(regs); | |
1339 | ret = ptrace(PTRACE_GETREGSET, tracee, NT_PRSTATUS, &iov); | |
4a0b8807 | 1340 | #endif |
34a048cc | 1341 | EXPECT_EQ(0, ret) {} |
c99ee51a | 1342 | |
256d0afb | 1343 | #if defined(__x86_64__) || defined(__i386__) || defined(__powerpc__) || \ |
64e2a42b | 1344 | defined(__s390__) || defined(__hppa__) |
c99ee51a KC |
1345 | { |
1346 | regs.SYSCALL_NUM = syscall; | |
1347 | } | |
0ce105bf MR |
1348 | #elif defined(__mips__) |
1349 | { | |
1350 | if (regs.SYSCALL_NUM == __NR_O32_Linux) | |
1351 | regs.SYSCALL_SYSCALL_NUM = syscall; | |
1352 | else | |
1353 | regs.SYSCALL_NUM = syscall; | |
1354 | } | |
c99ee51a KC |
1355 | |
1356 | #elif defined(__arm__) | |
1357 | # ifndef PTRACE_SET_SYSCALL | |
1358 | # define PTRACE_SET_SYSCALL 23 | |
1359 | # endif | |
1360 | { | |
1361 | ret = ptrace(PTRACE_SET_SYSCALL, tracee, NULL, syscall); | |
1362 | EXPECT_EQ(0, ret); | |
1363 | } | |
1364 | ||
256d0afb KC |
1365 | #elif defined(__aarch64__) |
1366 | # ifndef NT_ARM_SYSTEM_CALL | |
1367 | # define NT_ARM_SYSTEM_CALL 0x404 | |
1368 | # endif | |
1369 | { | |
1370 | iov.iov_base = &syscall; | |
1371 | iov.iov_len = sizeof(syscall); | |
1372 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_ARM_SYSTEM_CALL, | |
1373 | &iov); | |
1374 | EXPECT_EQ(0, ret); | |
1375 | } | |
1376 | ||
c99ee51a KC |
1377 | #else |
1378 | ASSERT_EQ(1, 0) { | |
1379 | TH_LOG("How is the syscall changed on this architecture?"); | |
1380 | } | |
1381 | #endif | |
1382 | ||
1383 | /* If syscall is skipped, change return value. */ | |
1384 | if (syscall == -1) | |
0ce105bf MR |
1385 | #ifdef SYSCALL_NUM_RET_SHARE_REG |
1386 | TH_LOG("Can't modify syscall return on this architecture"); | |
1387 | #else | |
a33b2d03 | 1388 | regs.SYSCALL_RET = EPERM; |
0ce105bf | 1389 | #endif |
c99ee51a | 1390 | |
4a0b8807 MS |
1391 | #ifdef HAVE_GETREGS |
1392 | ret = ptrace(PTRACE_SETREGS, tracee, 0, ®s); | |
1393 | #else | |
256d0afb KC |
1394 | iov.iov_base = ®s; |
1395 | iov.iov_len = sizeof(regs); | |
c99ee51a | 1396 | ret = ptrace(PTRACE_SETREGSET, tracee, NT_PRSTATUS, &iov); |
4a0b8807 | 1397 | #endif |
c99ee51a KC |
1398 | EXPECT_EQ(0, ret); |
1399 | } | |
1400 | ||
1401 | void tracer_syscall(struct __test_metadata *_metadata, pid_t tracee, | |
1402 | int status, void *args) | |
1403 | { | |
1404 | int ret; | |
1405 | unsigned long msg; | |
1406 | ||
1407 | /* Make sure we got the right message. */ | |
1408 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1409 | EXPECT_EQ(0, ret); | |
1410 | ||
b623c4da | 1411 | /* Validate and take action on expected syscalls. */ |
c99ee51a KC |
1412 | switch (msg) { |
1413 | case 0x1002: | |
1414 | /* change getpid to getppid. */ | |
b623c4da | 1415 | EXPECT_EQ(__NR_getpid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1416 | change_syscall(_metadata, tracee, __NR_getppid); |
1417 | break; | |
1418 | case 0x1003: | |
1419 | /* skip gettid. */ | |
b623c4da | 1420 | EXPECT_EQ(__NR_gettid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1421 | change_syscall(_metadata, tracee, -1); |
1422 | break; | |
1423 | case 0x1004: | |
1424 | /* do nothing (allow getppid) */ | |
b623c4da | 1425 | EXPECT_EQ(__NR_getppid, get_syscall(_metadata, tracee)); |
c99ee51a KC |
1426 | break; |
1427 | default: | |
1428 | EXPECT_EQ(0, msg) { | |
1429 | TH_LOG("Unknown PTRACE_GETEVENTMSG: 0x%lx", msg); | |
1430 | kill(tracee, SIGKILL); | |
1431 | } | |
1432 | } | |
1433 | ||
1434 | } | |
1435 | ||
58d0a862 KC |
1436 | void tracer_ptrace(struct __test_metadata *_metadata, pid_t tracee, |
1437 | int status, void *args) | |
1438 | { | |
1439 | int ret, nr; | |
1440 | unsigned long msg; | |
1441 | static bool entry; | |
1442 | ||
1443 | /* Make sure we got an empty message. */ | |
1444 | ret = ptrace(PTRACE_GETEVENTMSG, tracee, NULL, &msg); | |
1445 | EXPECT_EQ(0, ret); | |
1446 | EXPECT_EQ(0, msg); | |
1447 | ||
1448 | /* The only way to tell PTRACE_SYSCALL entry/exit is by counting. */ | |
1449 | entry = !entry; | |
1450 | if (!entry) | |
1451 | return; | |
1452 | ||
1453 | nr = get_syscall(_metadata, tracee); | |
1454 | ||
1455 | if (nr == __NR_getpid) | |
1456 | change_syscall(_metadata, tracee, __NR_getppid); | |
a33b2d03 KC |
1457 | if (nr == __NR_open) |
1458 | change_syscall(_metadata, tracee, -1); | |
58d0a862 KC |
1459 | } |
1460 | ||
c99ee51a KC |
1461 | FIXTURE_DATA(TRACE_syscall) { |
1462 | struct sock_fprog prog; | |
1463 | pid_t tracer, mytid, mypid, parent; | |
1464 | }; | |
1465 | ||
1466 | FIXTURE_SETUP(TRACE_syscall) | |
1467 | { | |
1468 | struct sock_filter filter[] = { | |
1469 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1470 | offsetof(struct seccomp_data, nr)), | |
1471 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
1472 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1002), | |
1473 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_gettid, 0, 1), | |
1474 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1003), | |
1475 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1476 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE | 0x1004), | |
1477 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1478 | }; | |
1479 | ||
1480 | memset(&self->prog, 0, sizeof(self->prog)); | |
1481 | self->prog.filter = malloc(sizeof(filter)); | |
1482 | ASSERT_NE(NULL, self->prog.filter); | |
1483 | memcpy(self->prog.filter, filter, sizeof(filter)); | |
1484 | self->prog.len = (unsigned short)ARRAY_SIZE(filter); | |
1485 | ||
1486 | /* Prepare some testable syscall results. */ | |
1487 | self->mytid = syscall(__NR_gettid); | |
1488 | ASSERT_GT(self->mytid, 0); | |
1489 | ASSERT_NE(self->mytid, 1) { | |
1490 | TH_LOG("Running this test as init is not supported. :)"); | |
1491 | } | |
1492 | ||
1493 | self->mypid = getpid(); | |
1494 | ASSERT_GT(self->mypid, 0); | |
1495 | ASSERT_EQ(self->mytid, self->mypid); | |
1496 | ||
1497 | self->parent = getppid(); | |
1498 | ASSERT_GT(self->parent, 0); | |
1499 | ASSERT_NE(self->parent, self->mypid); | |
1500 | ||
1501 | /* Launch tracer. */ | |
58d0a862 KC |
1502 | self->tracer = setup_trace_fixture(_metadata, tracer_syscall, NULL, |
1503 | false); | |
c99ee51a KC |
1504 | } |
1505 | ||
1506 | FIXTURE_TEARDOWN(TRACE_syscall) | |
1507 | { | |
1508 | teardown_trace_fixture(_metadata, self->tracer); | |
1509 | if (self->prog.filter) | |
1510 | free(self->prog.filter); | |
1511 | } | |
1512 | ||
a33b2d03 KC |
1513 | TEST_F(TRACE_syscall, ptrace_syscall_redirected) |
1514 | { | |
1515 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1516 | teardown_trace_fixture(_metadata, self->tracer); | |
1517 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1518 | true); | |
1519 | ||
1520 | /* Tracer will redirect getpid to getppid. */ | |
1521 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1522 | } | |
1523 | ||
1524 | TEST_F(TRACE_syscall, ptrace_syscall_dropped) | |
1525 | { | |
1526 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1527 | teardown_trace_fixture(_metadata, self->tracer); | |
1528 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1529 | true); | |
1530 | ||
1531 | /* Tracer should skip the open syscall, resulting in EPERM. */ | |
1532 | EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_open)); | |
1533 | } | |
1534 | ||
c99ee51a KC |
1535 | TEST_F(TRACE_syscall, syscall_allowed) |
1536 | { | |
1537 | long ret; | |
1538 | ||
1539 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1540 | ASSERT_EQ(0, ret); | |
1541 | ||
1542 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1543 | ASSERT_EQ(0, ret); | |
1544 | ||
1545 | /* getppid works as expected (no changes). */ | |
1546 | EXPECT_EQ(self->parent, syscall(__NR_getppid)); | |
1547 | EXPECT_NE(self->mypid, syscall(__NR_getppid)); | |
1548 | } | |
1549 | ||
1550 | TEST_F(TRACE_syscall, syscall_redirected) | |
1551 | { | |
1552 | long ret; | |
1553 | ||
1554 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1555 | ASSERT_EQ(0, ret); | |
1556 | ||
1557 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1558 | ASSERT_EQ(0, ret); | |
1559 | ||
1560 | /* getpid has been redirected to getppid as expected. */ | |
1561 | EXPECT_EQ(self->parent, syscall(__NR_getpid)); | |
1562 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1563 | } | |
1564 | ||
1565 | TEST_F(TRACE_syscall, syscall_dropped) | |
1566 | { | |
1567 | long ret; | |
1568 | ||
1569 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1570 | ASSERT_EQ(0, ret); | |
1571 | ||
1572 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1573 | ASSERT_EQ(0, ret); | |
1574 | ||
1575 | /* gettid has been skipped and an altered return value stored. */ | |
a33b2d03 | 1576 | EXPECT_SYSCALL_RETURN(EPERM, syscall(__NR_gettid)); |
c99ee51a KC |
1577 | EXPECT_NE(self->mytid, syscall(__NR_gettid)); |
1578 | } | |
1579 | ||
58d0a862 KC |
1580 | TEST_F(TRACE_syscall, skip_after_RET_TRACE) |
1581 | { | |
1582 | struct sock_filter filter[] = { | |
1583 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1584 | offsetof(struct seccomp_data, nr)), | |
1585 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1586 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM), | |
1587 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1588 | }; | |
1589 | struct sock_fprog prog = { | |
1590 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1591 | .filter = filter, | |
1592 | }; | |
1593 | long ret; | |
1594 | ||
1595 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1596 | ASSERT_EQ(0, ret); | |
1597 | ||
1598 | /* Install fixture filter. */ | |
1599 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1600 | ASSERT_EQ(0, ret); | |
1601 | ||
1602 | /* Install "errno on getppid" filter. */ | |
1603 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1604 | ASSERT_EQ(0, ret); | |
1605 | ||
1606 | /* Tracer will redirect getpid to getppid, and we should see EPERM. */ | |
a33b2d03 | 1607 | errno = 0; |
58d0a862 KC |
1608 | EXPECT_EQ(-1, syscall(__NR_getpid)); |
1609 | EXPECT_EQ(EPERM, errno); | |
1610 | } | |
1611 | ||
1612 | TEST_F_SIGNAL(TRACE_syscall, kill_after_RET_TRACE, SIGSYS) | |
1613 | { | |
1614 | struct sock_filter filter[] = { | |
1615 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1616 | offsetof(struct seccomp_data, nr)), | |
1617 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1618 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1619 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1620 | }; | |
1621 | struct sock_fprog prog = { | |
1622 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1623 | .filter = filter, | |
1624 | }; | |
1625 | long ret; | |
1626 | ||
1627 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1628 | ASSERT_EQ(0, ret); | |
1629 | ||
1630 | /* Install fixture filter. */ | |
1631 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &self->prog, 0, 0); | |
1632 | ASSERT_EQ(0, ret); | |
1633 | ||
1634 | /* Install "death on getppid" filter. */ | |
1635 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1636 | ASSERT_EQ(0, ret); | |
1637 | ||
1638 | /* Tracer will redirect getpid to getppid, and we should die. */ | |
1639 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1640 | } | |
1641 | ||
1642 | TEST_F(TRACE_syscall, skip_after_ptrace) | |
1643 | { | |
1644 | struct sock_filter filter[] = { | |
1645 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1646 | offsetof(struct seccomp_data, nr)), | |
1647 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1648 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EPERM), | |
1649 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1650 | }; | |
1651 | struct sock_fprog prog = { | |
1652 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1653 | .filter = filter, | |
1654 | }; | |
1655 | long ret; | |
1656 | ||
1657 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1658 | teardown_trace_fixture(_metadata, self->tracer); | |
1659 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1660 | true); | |
1661 | ||
1662 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1663 | ASSERT_EQ(0, ret); | |
1664 | ||
1665 | /* Install "errno on getppid" filter. */ | |
1666 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1667 | ASSERT_EQ(0, ret); | |
1668 | ||
1669 | /* Tracer will redirect getpid to getppid, and we should see EPERM. */ | |
1670 | EXPECT_EQ(-1, syscall(__NR_getpid)); | |
1671 | EXPECT_EQ(EPERM, errno); | |
1672 | } | |
1673 | ||
1674 | TEST_F_SIGNAL(TRACE_syscall, kill_after_ptrace, SIGSYS) | |
1675 | { | |
1676 | struct sock_filter filter[] = { | |
1677 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1678 | offsetof(struct seccomp_data, nr)), | |
1679 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getppid, 0, 1), | |
1680 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1681 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1682 | }; | |
1683 | struct sock_fprog prog = { | |
1684 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1685 | .filter = filter, | |
1686 | }; | |
1687 | long ret; | |
1688 | ||
1689 | /* Swap SECCOMP_RET_TRACE tracer for PTRACE_SYSCALL tracer. */ | |
1690 | teardown_trace_fixture(_metadata, self->tracer); | |
1691 | self->tracer = setup_trace_fixture(_metadata, tracer_ptrace, NULL, | |
1692 | true); | |
1693 | ||
1694 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1695 | ASSERT_EQ(0, ret); | |
1696 | ||
1697 | /* Install "death on getppid" filter. */ | |
1698 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
1699 | ASSERT_EQ(0, ret); | |
1700 | ||
1701 | /* Tracer will redirect getpid to getppid, and we should die. */ | |
1702 | EXPECT_NE(self->mypid, syscall(__NR_getpid)); | |
1703 | } | |
1704 | ||
c99ee51a KC |
1705 | #ifndef __NR_seccomp |
1706 | # if defined(__i386__) | |
1707 | # define __NR_seccomp 354 | |
1708 | # elif defined(__x86_64__) | |
1709 | # define __NR_seccomp 317 | |
1710 | # elif defined(__arm__) | |
1711 | # define __NR_seccomp 383 | |
1712 | # elif defined(__aarch64__) | |
1713 | # define __NR_seccomp 277 | |
64e2a42b HD |
1714 | # elif defined(__hppa__) |
1715 | # define __NR_seccomp 338 | |
5d83c2b3 ME |
1716 | # elif defined(__powerpc__) |
1717 | # define __NR_seccomp 358 | |
b623c4da KC |
1718 | # elif defined(__s390__) |
1719 | # define __NR_seccomp 348 | |
c99ee51a KC |
1720 | # else |
1721 | # warning "seccomp syscall number unknown for this architecture" | |
1722 | # define __NR_seccomp 0xffff | |
1723 | # endif | |
1724 | #endif | |
1725 | ||
1726 | #ifndef SECCOMP_SET_MODE_STRICT | |
1727 | #define SECCOMP_SET_MODE_STRICT 0 | |
1728 | #endif | |
1729 | ||
1730 | #ifndef SECCOMP_SET_MODE_FILTER | |
1731 | #define SECCOMP_SET_MODE_FILTER 1 | |
1732 | #endif | |
1733 | ||
d612b1fd TH |
1734 | #ifndef SECCOMP_GET_ACTION_AVAIL |
1735 | #define SECCOMP_GET_ACTION_AVAIL 2 | |
1736 | #endif | |
1737 | ||
6c045d07 MS |
1738 | #ifndef SECCOMP_FILTER_FLAG_TSYNC |
1739 | #define SECCOMP_FILTER_FLAG_TSYNC 1 | |
c99ee51a KC |
1740 | #endif |
1741 | ||
e66a3997 TH |
1742 | #ifndef SECCOMP_FILTER_FLAG_LOG |
1743 | #define SECCOMP_FILTER_FLAG_LOG 2 | |
1744 | #endif | |
1745 | ||
c99ee51a | 1746 | #ifndef seccomp |
505ce68c | 1747 | int seccomp(unsigned int op, unsigned int flags, void *args) |
c99ee51a KC |
1748 | { |
1749 | errno = 0; | |
505ce68c | 1750 | return syscall(__NR_seccomp, op, flags, args); |
c99ee51a KC |
1751 | } |
1752 | #endif | |
1753 | ||
1754 | TEST(seccomp_syscall) | |
1755 | { | |
1756 | struct sock_filter filter[] = { | |
1757 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1758 | }; | |
1759 | struct sock_fprog prog = { | |
1760 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1761 | .filter = filter, | |
1762 | }; | |
1763 | long ret; | |
1764 | ||
1765 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
1766 | ASSERT_EQ(0, ret) { | |
1767 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1768 | } | |
1769 | ||
1770 | /* Reject insane operation. */ | |
1771 | ret = seccomp(-1, 0, &prog); | |
b623c4da KC |
1772 | ASSERT_NE(ENOSYS, errno) { |
1773 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1774 | } | |
c99ee51a KC |
1775 | EXPECT_EQ(EINVAL, errno) { |
1776 | TH_LOG("Did not reject crazy op value!"); | |
1777 | } | |
1778 | ||
1779 | /* Reject strict with flags or pointer. */ | |
1780 | ret = seccomp(SECCOMP_SET_MODE_STRICT, -1, NULL); | |
1781 | EXPECT_EQ(EINVAL, errno) { | |
1782 | TH_LOG("Did not reject mode strict with flags!"); | |
1783 | } | |
1784 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, &prog); | |
1785 | EXPECT_EQ(EINVAL, errno) { | |
1786 | TH_LOG("Did not reject mode strict with uargs!"); | |
1787 | } | |
1788 | ||
1789 | /* Reject insane args for filter. */ | |
1790 | ret = seccomp(SECCOMP_SET_MODE_FILTER, -1, &prog); | |
1791 | EXPECT_EQ(EINVAL, errno) { | |
1792 | TH_LOG("Did not reject crazy filter flags!"); | |
1793 | } | |
1794 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, NULL); | |
1795 | EXPECT_EQ(EFAULT, errno) { | |
1796 | TH_LOG("Did not reject NULL filter!"); | |
1797 | } | |
1798 | ||
1799 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
1800 | EXPECT_EQ(0, errno) { | |
1801 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER: %s", | |
1802 | strerror(errno)); | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | TEST(seccomp_syscall_mode_lock) | |
1807 | { | |
1808 | struct sock_filter filter[] = { | |
1809 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1810 | }; | |
1811 | struct sock_fprog prog = { | |
1812 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1813 | .filter = filter, | |
1814 | }; | |
1815 | long ret; | |
1816 | ||
1817 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
1818 | ASSERT_EQ(0, ret) { | |
1819 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1820 | } | |
1821 | ||
1822 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
1823 | ASSERT_NE(ENOSYS, errno) { |
1824 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1825 | } | |
c99ee51a KC |
1826 | EXPECT_EQ(0, ret) { |
1827 | TH_LOG("Could not install filter!"); | |
1828 | } | |
1829 | ||
1830 | /* Make sure neither entry point will switch to strict. */ | |
1831 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT, 0, 0, 0); | |
1832 | EXPECT_EQ(EINVAL, errno) { | |
1833 | TH_LOG("Switched to mode strict!"); | |
1834 | } | |
1835 | ||
1836 | ret = seccomp(SECCOMP_SET_MODE_STRICT, 0, NULL); | |
1837 | EXPECT_EQ(EINVAL, errno) { | |
1838 | TH_LOG("Switched to mode strict!"); | |
1839 | } | |
1840 | } | |
1841 | ||
2b7ea5b5 TH |
1842 | /* |
1843 | * Test detection of known and unknown filter flags. Userspace needs to be able | |
1844 | * to check if a filter flag is supported by the current kernel and a good way | |
1845 | * of doing that is by attempting to enter filter mode, with the flag bit in | |
1846 | * question set, and a NULL pointer for the _args_ parameter. EFAULT indicates | |
1847 | * that the flag is valid and EINVAL indicates that the flag is invalid. | |
1848 | */ | |
1849 | TEST(detect_seccomp_filter_flags) | |
1850 | { | |
e66a3997 TH |
1851 | unsigned int flags[] = { SECCOMP_FILTER_FLAG_TSYNC, |
1852 | SECCOMP_FILTER_FLAG_LOG }; | |
2b7ea5b5 TH |
1853 | unsigned int flag, all_flags; |
1854 | int i; | |
1855 | long ret; | |
1856 | ||
1857 | /* Test detection of known-good filter flags */ | |
1858 | for (i = 0, all_flags = 0; i < ARRAY_SIZE(flags); i++) { | |
1859 | flag = flags[i]; | |
1860 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
1861 | ASSERT_NE(ENOSYS, errno) { | |
1862 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1863 | } | |
1864 | EXPECT_EQ(-1, ret); | |
1865 | EXPECT_EQ(EFAULT, errno) { | |
1866 | TH_LOG("Failed to detect that a known-good filter flag (0x%X) is supported!", | |
1867 | flag); | |
1868 | } | |
1869 | ||
1870 | all_flags |= flag; | |
1871 | } | |
1872 | ||
1873 | /* Test detection of all known-good filter flags */ | |
1874 | ret = seccomp(SECCOMP_SET_MODE_FILTER, all_flags, NULL); | |
1875 | EXPECT_EQ(-1, ret); | |
1876 | EXPECT_EQ(EFAULT, errno) { | |
1877 | TH_LOG("Failed to detect that all known-good filter flags (0x%X) are supported!", | |
1878 | all_flags); | |
1879 | } | |
1880 | ||
1881 | /* Test detection of an unknown filter flag */ | |
1882 | flag = -1; | |
1883 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
1884 | EXPECT_EQ(-1, ret); | |
1885 | EXPECT_EQ(EINVAL, errno) { | |
1886 | TH_LOG("Failed to detect that an unknown filter flag (0x%X) is unsupported!", | |
1887 | flag); | |
1888 | } | |
1889 | ||
1890 | /* | |
1891 | * Test detection of an unknown filter flag that may simply need to be | |
1892 | * added to this test | |
1893 | */ | |
1894 | flag = flags[ARRAY_SIZE(flags) - 1] << 1; | |
1895 | ret = seccomp(SECCOMP_SET_MODE_FILTER, flag, NULL); | |
1896 | EXPECT_EQ(-1, ret); | |
1897 | EXPECT_EQ(EINVAL, errno) { | |
1898 | 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?", | |
1899 | flag); | |
1900 | } | |
1901 | } | |
1902 | ||
c99ee51a KC |
1903 | TEST(TSYNC_first) |
1904 | { | |
1905 | struct sock_filter filter[] = { | |
1906 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1907 | }; | |
1908 | struct sock_fprog prog = { | |
1909 | .len = (unsigned short)ARRAY_SIZE(filter), | |
1910 | .filter = filter, | |
1911 | }; | |
1912 | long ret; | |
1913 | ||
1914 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, NULL, 0, 0); | |
1915 | ASSERT_EQ(0, ret) { | |
1916 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
1917 | } | |
1918 | ||
6c045d07 | 1919 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a | 1920 | &prog); |
b623c4da KC |
1921 | ASSERT_NE(ENOSYS, errno) { |
1922 | TH_LOG("Kernel does not support seccomp syscall!"); | |
1923 | } | |
c99ee51a KC |
1924 | EXPECT_EQ(0, ret) { |
1925 | TH_LOG("Could not install initial filter with TSYNC!"); | |
1926 | } | |
1927 | } | |
1928 | ||
1929 | #define TSYNC_SIBLINGS 2 | |
1930 | struct tsync_sibling { | |
1931 | pthread_t tid; | |
1932 | pid_t system_tid; | |
1933 | sem_t *started; | |
1934 | pthread_cond_t *cond; | |
1935 | pthread_mutex_t *mutex; | |
1936 | int diverge; | |
1937 | int num_waits; | |
1938 | struct sock_fprog *prog; | |
1939 | struct __test_metadata *metadata; | |
1940 | }; | |
1941 | ||
93bd70e3 KC |
1942 | /* |
1943 | * To avoid joining joined threads (which is not allowed by Bionic), | |
1944 | * make sure we both successfully join and clear the tid to skip a | |
1945 | * later join attempt during fixture teardown. Any remaining threads | |
1946 | * will be directly killed during teardown. | |
1947 | */ | |
1948 | #define PTHREAD_JOIN(tid, status) \ | |
1949 | do { \ | |
1950 | int _rc = pthread_join(tid, status); \ | |
1951 | if (_rc) { \ | |
1952 | TH_LOG("pthread_join of tid %u failed: %d\n", \ | |
1953 | (unsigned int)tid, _rc); \ | |
1954 | } else { \ | |
1955 | tid = 0; \ | |
1956 | } \ | |
1957 | } while (0) | |
1958 | ||
c99ee51a KC |
1959 | FIXTURE_DATA(TSYNC) { |
1960 | struct sock_fprog root_prog, apply_prog; | |
1961 | struct tsync_sibling sibling[TSYNC_SIBLINGS]; | |
1962 | sem_t started; | |
1963 | pthread_cond_t cond; | |
1964 | pthread_mutex_t mutex; | |
1965 | int sibling_count; | |
1966 | }; | |
1967 | ||
1968 | FIXTURE_SETUP(TSYNC) | |
1969 | { | |
1970 | struct sock_filter root_filter[] = { | |
1971 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1972 | }; | |
1973 | struct sock_filter apply_filter[] = { | |
1974 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
1975 | offsetof(struct seccomp_data, nr)), | |
1976 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 0, 1), | |
1977 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
1978 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
1979 | }; | |
1980 | ||
1981 | memset(&self->root_prog, 0, sizeof(self->root_prog)); | |
1982 | memset(&self->apply_prog, 0, sizeof(self->apply_prog)); | |
1983 | memset(&self->sibling, 0, sizeof(self->sibling)); | |
1984 | self->root_prog.filter = malloc(sizeof(root_filter)); | |
1985 | ASSERT_NE(NULL, self->root_prog.filter); | |
1986 | memcpy(self->root_prog.filter, &root_filter, sizeof(root_filter)); | |
1987 | self->root_prog.len = (unsigned short)ARRAY_SIZE(root_filter); | |
1988 | ||
1989 | self->apply_prog.filter = malloc(sizeof(apply_filter)); | |
1990 | ASSERT_NE(NULL, self->apply_prog.filter); | |
1991 | memcpy(self->apply_prog.filter, &apply_filter, sizeof(apply_filter)); | |
1992 | self->apply_prog.len = (unsigned short)ARRAY_SIZE(apply_filter); | |
1993 | ||
1994 | self->sibling_count = 0; | |
1995 | pthread_mutex_init(&self->mutex, NULL); | |
1996 | pthread_cond_init(&self->cond, NULL); | |
1997 | sem_init(&self->started, 0, 0); | |
1998 | self->sibling[0].tid = 0; | |
1999 | self->sibling[0].cond = &self->cond; | |
2000 | self->sibling[0].started = &self->started; | |
2001 | self->sibling[0].mutex = &self->mutex; | |
2002 | self->sibling[0].diverge = 0; | |
2003 | self->sibling[0].num_waits = 1; | |
2004 | self->sibling[0].prog = &self->root_prog; | |
2005 | self->sibling[0].metadata = _metadata; | |
2006 | self->sibling[1].tid = 0; | |
2007 | self->sibling[1].cond = &self->cond; | |
2008 | self->sibling[1].started = &self->started; | |
2009 | self->sibling[1].mutex = &self->mutex; | |
2010 | self->sibling[1].diverge = 0; | |
2011 | self->sibling[1].prog = &self->root_prog; | |
2012 | self->sibling[1].num_waits = 1; | |
2013 | self->sibling[1].metadata = _metadata; | |
2014 | } | |
2015 | ||
2016 | FIXTURE_TEARDOWN(TSYNC) | |
2017 | { | |
2018 | int sib = 0; | |
2019 | ||
2020 | if (self->root_prog.filter) | |
2021 | free(self->root_prog.filter); | |
2022 | if (self->apply_prog.filter) | |
2023 | free(self->apply_prog.filter); | |
2024 | ||
2025 | for ( ; sib < self->sibling_count; ++sib) { | |
2026 | struct tsync_sibling *s = &self->sibling[sib]; | |
c99ee51a KC |
2027 | |
2028 | if (!s->tid) | |
2029 | continue; | |
93bd70e3 KC |
2030 | /* |
2031 | * If a thread is still running, it may be stuck, so hit | |
2032 | * it over the head really hard. | |
2033 | */ | |
2034 | pthread_kill(s->tid, 9); | |
c99ee51a KC |
2035 | } |
2036 | pthread_mutex_destroy(&self->mutex); | |
2037 | pthread_cond_destroy(&self->cond); | |
2038 | sem_destroy(&self->started); | |
2039 | } | |
2040 | ||
2041 | void *tsync_sibling(void *data) | |
2042 | { | |
2043 | long ret = 0; | |
2044 | struct tsync_sibling *me = data; | |
2045 | ||
2046 | me->system_tid = syscall(__NR_gettid); | |
2047 | ||
2048 | pthread_mutex_lock(me->mutex); | |
2049 | if (me->diverge) { | |
2050 | /* Just re-apply the root prog to fork the tree */ | |
2051 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, | |
2052 | me->prog, 0, 0); | |
2053 | } | |
2054 | sem_post(me->started); | |
2055 | /* Return outside of started so parent notices failures. */ | |
2056 | if (ret) { | |
2057 | pthread_mutex_unlock(me->mutex); | |
2058 | return (void *)SIBLING_EXIT_FAILURE; | |
2059 | } | |
2060 | do { | |
2061 | pthread_cond_wait(me->cond, me->mutex); | |
2062 | me->num_waits = me->num_waits - 1; | |
2063 | } while (me->num_waits); | |
2064 | pthread_mutex_unlock(me->mutex); | |
2065 | ||
2066 | ret = prctl(PR_GET_NO_NEW_PRIVS, 0, 0, 0, 0); | |
2067 | if (!ret) | |
2068 | return (void *)SIBLING_EXIT_NEWPRIVS; | |
2069 | read(0, NULL, 0); | |
2070 | return (void *)SIBLING_EXIT_UNKILLED; | |
2071 | } | |
2072 | ||
2073 | void tsync_start_sibling(struct tsync_sibling *sibling) | |
2074 | { | |
2075 | pthread_create(&sibling->tid, NULL, tsync_sibling, (void *)sibling); | |
2076 | } | |
2077 | ||
2078 | TEST_F(TSYNC, siblings_fail_prctl) | |
2079 | { | |
2080 | long ret; | |
2081 | void *status; | |
2082 | struct sock_filter filter[] = { | |
2083 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2084 | offsetof(struct seccomp_data, nr)), | |
2085 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_prctl, 0, 1), | |
2086 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ERRNO | EINVAL), | |
2087 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2088 | }; | |
2089 | struct sock_fprog prog = { | |
2090 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2091 | .filter = filter, | |
2092 | }; | |
2093 | ||
2094 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2095 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2096 | } | |
2097 | ||
2098 | /* Check prctl failure detection by requesting sib 0 diverge. */ | |
2099 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &prog); | |
b623c4da KC |
2100 | ASSERT_NE(ENOSYS, errno) { |
2101 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2102 | } | |
c99ee51a KC |
2103 | ASSERT_EQ(0, ret) { |
2104 | TH_LOG("setting filter failed"); | |
2105 | } | |
2106 | ||
2107 | self->sibling[0].diverge = 1; | |
2108 | tsync_start_sibling(&self->sibling[0]); | |
2109 | tsync_start_sibling(&self->sibling[1]); | |
2110 | ||
2111 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2112 | sem_wait(&self->started); | |
2113 | self->sibling_count++; | |
2114 | } | |
2115 | ||
2116 | /* Signal the threads to clean up*/ | |
2117 | pthread_mutex_lock(&self->mutex); | |
2118 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2119 | TH_LOG("cond broadcast non-zero"); | |
2120 | } | |
2121 | pthread_mutex_unlock(&self->mutex); | |
2122 | ||
2123 | /* Ensure diverging sibling failed to call prctl. */ | |
93bd70e3 | 2124 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2125 | EXPECT_EQ(SIBLING_EXIT_FAILURE, (long)status); |
93bd70e3 | 2126 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2127 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2128 | } | |
2129 | ||
2130 | TEST_F(TSYNC, two_siblings_with_ancestor) | |
2131 | { | |
2132 | long ret; | |
2133 | void *status; | |
2134 | ||
2135 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2136 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2137 | } | |
2138 | ||
2139 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2140 | ASSERT_NE(ENOSYS, errno) { |
2141 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2142 | } | |
c99ee51a KC |
2143 | ASSERT_EQ(0, ret) { |
2144 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2145 | } | |
2146 | tsync_start_sibling(&self->sibling[0]); | |
2147 | tsync_start_sibling(&self->sibling[1]); | |
2148 | ||
2149 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2150 | sem_wait(&self->started); | |
2151 | self->sibling_count++; | |
2152 | } | |
2153 | ||
6c045d07 | 2154 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2155 | &self->apply_prog); |
2156 | ASSERT_EQ(0, ret) { | |
2157 | TH_LOG("Could install filter on all threads!"); | |
2158 | } | |
2159 | /* Tell the siblings to test the policy */ | |
2160 | pthread_mutex_lock(&self->mutex); | |
2161 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2162 | TH_LOG("cond broadcast non-zero"); | |
2163 | } | |
2164 | pthread_mutex_unlock(&self->mutex); | |
2165 | /* Ensure they are both killed and don't exit cleanly. */ | |
93bd70e3 | 2166 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2167 | EXPECT_EQ(0x0, (long)status); |
93bd70e3 | 2168 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2169 | EXPECT_EQ(0x0, (long)status); |
2170 | } | |
2171 | ||
2172 | TEST_F(TSYNC, two_sibling_want_nnp) | |
2173 | { | |
2174 | void *status; | |
2175 | ||
2176 | /* start siblings before any prctl() operations */ | |
2177 | tsync_start_sibling(&self->sibling[0]); | |
2178 | tsync_start_sibling(&self->sibling[1]); | |
2179 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2180 | sem_wait(&self->started); | |
2181 | self->sibling_count++; | |
2182 | } | |
2183 | ||
2184 | /* Tell the siblings to test no policy */ | |
2185 | pthread_mutex_lock(&self->mutex); | |
2186 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2187 | TH_LOG("cond broadcast non-zero"); | |
2188 | } | |
2189 | pthread_mutex_unlock(&self->mutex); | |
2190 | ||
2191 | /* Ensure they are both upset about lacking nnp. */ | |
93bd70e3 | 2192 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2193 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); |
93bd70e3 | 2194 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2195 | EXPECT_EQ(SIBLING_EXIT_NEWPRIVS, (long)status); |
2196 | } | |
2197 | ||
2198 | TEST_F(TSYNC, two_siblings_with_no_filter) | |
2199 | { | |
2200 | long ret; | |
2201 | void *status; | |
2202 | ||
2203 | /* start siblings before any prctl() operations */ | |
2204 | tsync_start_sibling(&self->sibling[0]); | |
2205 | tsync_start_sibling(&self->sibling[1]); | |
2206 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2207 | sem_wait(&self->started); | |
2208 | self->sibling_count++; | |
2209 | } | |
2210 | ||
2211 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2212 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2213 | } | |
2214 | ||
6c045d07 | 2215 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a | 2216 | &self->apply_prog); |
b623c4da KC |
2217 | ASSERT_NE(ENOSYS, errno) { |
2218 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2219 | } | |
c99ee51a KC |
2220 | ASSERT_EQ(0, ret) { |
2221 | TH_LOG("Could install filter on all threads!"); | |
2222 | } | |
2223 | ||
2224 | /* Tell the siblings to test the policy */ | |
2225 | pthread_mutex_lock(&self->mutex); | |
2226 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2227 | TH_LOG("cond broadcast non-zero"); | |
2228 | } | |
2229 | pthread_mutex_unlock(&self->mutex); | |
2230 | ||
2231 | /* Ensure they are both killed and don't exit cleanly. */ | |
93bd70e3 | 2232 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2233 | EXPECT_EQ(0x0, (long)status); |
93bd70e3 | 2234 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2235 | EXPECT_EQ(0x0, (long)status); |
2236 | } | |
2237 | ||
2238 | TEST_F(TSYNC, two_siblings_with_one_divergence) | |
2239 | { | |
2240 | long ret; | |
2241 | void *status; | |
2242 | ||
2243 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2244 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2245 | } | |
2246 | ||
2247 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2248 | ASSERT_NE(ENOSYS, errno) { |
2249 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2250 | } | |
c99ee51a KC |
2251 | ASSERT_EQ(0, ret) { |
2252 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2253 | } | |
2254 | self->sibling[0].diverge = 1; | |
2255 | tsync_start_sibling(&self->sibling[0]); | |
2256 | tsync_start_sibling(&self->sibling[1]); | |
2257 | ||
2258 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2259 | sem_wait(&self->started); | |
2260 | self->sibling_count++; | |
2261 | } | |
2262 | ||
6c045d07 | 2263 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2264 | &self->apply_prog); |
2265 | ASSERT_EQ(self->sibling[0].system_tid, ret) { | |
2266 | TH_LOG("Did not fail on diverged sibling."); | |
2267 | } | |
2268 | ||
2269 | /* Wake the threads */ | |
2270 | pthread_mutex_lock(&self->mutex); | |
2271 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2272 | TH_LOG("cond broadcast non-zero"); | |
2273 | } | |
2274 | pthread_mutex_unlock(&self->mutex); | |
2275 | ||
2276 | /* Ensure they are both unkilled. */ | |
93bd70e3 | 2277 | PTHREAD_JOIN(self->sibling[0].tid, &status); |
c99ee51a | 2278 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
93bd70e3 | 2279 | PTHREAD_JOIN(self->sibling[1].tid, &status); |
c99ee51a KC |
2280 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2281 | } | |
2282 | ||
2283 | TEST_F(TSYNC, two_siblings_not_under_filter) | |
2284 | { | |
2285 | long ret, sib; | |
2286 | void *status; | |
2287 | ||
2288 | ASSERT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2289 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2290 | } | |
2291 | ||
2292 | /* | |
2293 | * Sibling 0 will have its own seccomp policy | |
2294 | * and Sibling 1 will not be under seccomp at | |
2295 | * all. Sibling 1 will enter seccomp and 0 | |
2296 | * will cause failure. | |
2297 | */ | |
2298 | self->sibling[0].diverge = 1; | |
2299 | tsync_start_sibling(&self->sibling[0]); | |
2300 | tsync_start_sibling(&self->sibling[1]); | |
2301 | ||
2302 | while (self->sibling_count < TSYNC_SIBLINGS) { | |
2303 | sem_wait(&self->started); | |
2304 | self->sibling_count++; | |
2305 | } | |
2306 | ||
2307 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &self->root_prog); | |
b623c4da KC |
2308 | ASSERT_NE(ENOSYS, errno) { |
2309 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2310 | } | |
c99ee51a KC |
2311 | ASSERT_EQ(0, ret) { |
2312 | TH_LOG("Kernel does not support SECCOMP_SET_MODE_FILTER!"); | |
2313 | } | |
2314 | ||
6c045d07 | 2315 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2316 | &self->apply_prog); |
2317 | ASSERT_EQ(ret, self->sibling[0].system_tid) { | |
2318 | TH_LOG("Did not fail on diverged sibling."); | |
2319 | } | |
2320 | sib = 1; | |
2321 | if (ret == self->sibling[0].system_tid) | |
2322 | sib = 0; | |
2323 | ||
2324 | pthread_mutex_lock(&self->mutex); | |
2325 | ||
2326 | /* Increment the other siblings num_waits so we can clean up | |
2327 | * the one we just saw. | |
2328 | */ | |
2329 | self->sibling[!sib].num_waits += 1; | |
2330 | ||
2331 | /* Signal the thread to clean up*/ | |
2332 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2333 | TH_LOG("cond broadcast non-zero"); | |
2334 | } | |
2335 | pthread_mutex_unlock(&self->mutex); | |
93bd70e3 | 2336 | PTHREAD_JOIN(self->sibling[sib].tid, &status); |
c99ee51a KC |
2337 | EXPECT_EQ(SIBLING_EXIT_UNKILLED, (long)status); |
2338 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2339 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2340 | sleep(0.1); | |
2341 | /* Switch to the remaining sibling */ | |
2342 | sib = !sib; | |
2343 | ||
6c045d07 | 2344 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2345 | &self->apply_prog); |
2346 | ASSERT_EQ(0, ret) { | |
2347 | TH_LOG("Expected the remaining sibling to sync"); | |
2348 | }; | |
2349 | ||
2350 | pthread_mutex_lock(&self->mutex); | |
2351 | ||
2352 | /* If remaining sibling didn't have a chance to wake up during | |
2353 | * the first broadcast, manually reduce the num_waits now. | |
2354 | */ | |
2355 | if (self->sibling[sib].num_waits > 1) | |
2356 | self->sibling[sib].num_waits = 1; | |
2357 | ASSERT_EQ(0, pthread_cond_broadcast(&self->cond)) { | |
2358 | TH_LOG("cond broadcast non-zero"); | |
2359 | } | |
2360 | pthread_mutex_unlock(&self->mutex); | |
93bd70e3 | 2361 | PTHREAD_JOIN(self->sibling[sib].tid, &status); |
c99ee51a KC |
2362 | EXPECT_EQ(0, (long)status); |
2363 | /* Poll for actual task death. pthread_join doesn't guarantee it. */ | |
2364 | while (!kill(self->sibling[sib].system_tid, 0)) | |
2365 | sleep(0.1); | |
2366 | ||
6c045d07 | 2367 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_TSYNC, |
c99ee51a KC |
2368 | &self->apply_prog); |
2369 | ASSERT_EQ(0, ret); /* just us chickens */ | |
2370 | } | |
2371 | ||
2372 | /* Make sure restarted syscalls are seen directly as "restart_syscall". */ | |
2373 | TEST(syscall_restart) | |
2374 | { | |
2375 | long ret; | |
2376 | unsigned long msg; | |
2377 | pid_t child_pid; | |
2378 | int pipefd[2]; | |
2379 | int status; | |
2380 | siginfo_t info = { }; | |
2381 | struct sock_filter filter[] = { | |
2382 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2383 | offsetof(struct seccomp_data, nr)), | |
2384 | ||
2385 | #ifdef __NR_sigreturn | |
2386 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_sigreturn, 6, 0), | |
2387 | #endif | |
2388 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_read, 5, 0), | |
2389 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_exit, 4, 0), | |
2390 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_rt_sigreturn, 3, 0), | |
256d0afb | 2391 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_nanosleep, 4, 0), |
c99ee51a KC |
2392 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_restart_syscall, 4, 0), |
2393 | ||
2394 | /* Allow __NR_write for easy logging. */ | |
2395 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_write, 0, 1), | |
2396 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2397 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
256d0afb KC |
2398 | /* The nanosleep jump target. */ |
2399 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x100), | |
2400 | /* The restart_syscall jump target. */ | |
2401 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRACE|0x200), | |
c99ee51a KC |
2402 | }; |
2403 | struct sock_fprog prog = { | |
2404 | .len = (unsigned short)ARRAY_SIZE(filter), | |
2405 | .filter = filter, | |
2406 | }; | |
256d0afb KC |
2407 | #if defined(__arm__) |
2408 | struct utsname utsbuf; | |
2409 | #endif | |
c99ee51a KC |
2410 | |
2411 | ASSERT_EQ(0, pipe(pipefd)); | |
2412 | ||
2413 | child_pid = fork(); | |
2414 | ASSERT_LE(0, child_pid); | |
2415 | if (child_pid == 0) { | |
2416 | /* Child uses EXPECT not ASSERT to deliver status correctly. */ | |
2417 | char buf = ' '; | |
256d0afb | 2418 | struct timespec timeout = { }; |
c99ee51a KC |
2419 | |
2420 | /* Attach parent as tracer and stop. */ | |
2421 | EXPECT_EQ(0, ptrace(PTRACE_TRACEME)); | |
2422 | EXPECT_EQ(0, raise(SIGSTOP)); | |
2423 | ||
2424 | EXPECT_EQ(0, close(pipefd[1])); | |
2425 | ||
2426 | EXPECT_EQ(0, prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0)) { | |
2427 | TH_LOG("Kernel does not support PR_SET_NO_NEW_PRIVS!"); | |
2428 | } | |
2429 | ||
2430 | ret = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &prog, 0, 0); | |
2431 | EXPECT_EQ(0, ret) { | |
2432 | TH_LOG("Failed to install filter!"); | |
2433 | } | |
2434 | ||
2435 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2436 | TH_LOG("Failed to read() sync from parent"); | |
2437 | } | |
2438 | EXPECT_EQ('.', buf) { | |
2439 | TH_LOG("Failed to get sync data from read()"); | |
2440 | } | |
2441 | ||
256d0afb KC |
2442 | /* Start nanosleep to be interrupted. */ |
2443 | timeout.tv_sec = 1; | |
c99ee51a | 2444 | errno = 0; |
256d0afb KC |
2445 | EXPECT_EQ(0, nanosleep(&timeout, NULL)) { |
2446 | TH_LOG("Call to nanosleep() failed (errno %d)", errno); | |
c99ee51a KC |
2447 | } |
2448 | ||
2449 | /* Read final sync from parent. */ | |
2450 | EXPECT_EQ(1, read(pipefd[0], &buf, 1)) { | |
2451 | TH_LOG("Failed final read() from parent"); | |
2452 | } | |
2453 | EXPECT_EQ('!', buf) { | |
2454 | TH_LOG("Failed to get final data from read()"); | |
2455 | } | |
2456 | ||
2457 | /* Directly report the status of our test harness results. */ | |
2458 | syscall(__NR_exit, _metadata->passed ? EXIT_SUCCESS | |
2459 | : EXIT_FAILURE); | |
2460 | } | |
2461 | EXPECT_EQ(0, close(pipefd[0])); | |
2462 | ||
2463 | /* Attach to child, setup options, and release. */ | |
2464 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2465 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2466 | ASSERT_EQ(0, ptrace(PTRACE_SETOPTIONS, child_pid, NULL, | |
2467 | PTRACE_O_TRACESECCOMP)); | |
2468 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2469 | ASSERT_EQ(1, write(pipefd[1], ".", 1)); | |
2470 | ||
256d0afb | 2471 | /* Wait for nanosleep() to start. */ |
c99ee51a KC |
2472 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); |
2473 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2474 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2475 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2476 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
2477 | ASSERT_EQ(0x100, msg); | |
256d0afb | 2478 | EXPECT_EQ(__NR_nanosleep, get_syscall(_metadata, child_pid)); |
c99ee51a KC |
2479 | |
2480 | /* Might as well check siginfo for sanity while we're here. */ | |
2481 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2482 | ASSERT_EQ(SIGTRAP, info.si_signo); | |
2483 | ASSERT_EQ(SIGTRAP | (PTRACE_EVENT_SECCOMP << 8), info.si_code); | |
2484 | EXPECT_EQ(0, info.si_errno); | |
2485 | EXPECT_EQ(getuid(), info.si_uid); | |
2486 | /* Verify signal delivery came from child (seccomp-triggered). */ | |
2487 | EXPECT_EQ(child_pid, info.si_pid); | |
2488 | ||
256d0afb | 2489 | /* Interrupt nanosleep with SIGSTOP (which we'll need to handle). */ |
c99ee51a KC |
2490 | ASSERT_EQ(0, kill(child_pid, SIGSTOP)); |
2491 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2492 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2493 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2494 | ASSERT_EQ(SIGSTOP, WSTOPSIG(status)); | |
2495 | /* Verify signal delivery came from parent now. */ | |
2496 | ASSERT_EQ(0, ptrace(PTRACE_GETSIGINFO, child_pid, NULL, &info)); | |
2497 | EXPECT_EQ(getpid(), info.si_pid); | |
2498 | ||
256d0afb | 2499 | /* Restart nanosleep with SIGCONT, which triggers restart_syscall. */ |
c99ee51a KC |
2500 | ASSERT_EQ(0, kill(child_pid, SIGCONT)); |
2501 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2502 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2503 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2504 | ASSERT_EQ(SIGCONT, WSTOPSIG(status)); | |
2505 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); | |
2506 | ||
2507 | /* Wait for restart_syscall() to start. */ | |
2508 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2509 | ASSERT_EQ(true, WIFSTOPPED(status)); | |
2510 | ASSERT_EQ(SIGTRAP, WSTOPSIG(status)); | |
2511 | ASSERT_EQ(PTRACE_EVENT_SECCOMP, (status >> 16)); | |
2512 | ASSERT_EQ(0, ptrace(PTRACE_GETEVENTMSG, child_pid, NULL, &msg)); | |
256d0afb | 2513 | |
c99ee51a KC |
2514 | ASSERT_EQ(0x200, msg); |
2515 | ret = get_syscall(_metadata, child_pid); | |
2516 | #if defined(__arm__) | |
256d0afb KC |
2517 | /* |
2518 | * FIXME: | |
2519 | * - native ARM registers do NOT expose true syscall. | |
2520 | * - compat ARM registers on ARM64 DO expose true syscall. | |
2521 | */ | |
2522 | ASSERT_EQ(0, uname(&utsbuf)); | |
2523 | if (strncmp(utsbuf.machine, "arm", 3) == 0) { | |
2524 | EXPECT_EQ(__NR_nanosleep, ret); | |
2525 | } else | |
c99ee51a | 2526 | #endif |
256d0afb KC |
2527 | { |
2528 | EXPECT_EQ(__NR_restart_syscall, ret); | |
2529 | } | |
c99ee51a | 2530 | |
256d0afb | 2531 | /* Write again to end test. */ |
c99ee51a KC |
2532 | ASSERT_EQ(0, ptrace(PTRACE_CONT, child_pid, NULL, 0)); |
2533 | ASSERT_EQ(1, write(pipefd[1], "!", 1)); | |
2534 | EXPECT_EQ(0, close(pipefd[1])); | |
2535 | ||
2536 | ASSERT_EQ(child_pid, waitpid(child_pid, &status, 0)); | |
2537 | if (WIFSIGNALED(status) || WEXITSTATUS(status)) | |
2538 | _metadata->passed = 0; | |
2539 | } | |
2540 | ||
e66a3997 TH |
2541 | TEST_SIGNAL(filter_flag_log, SIGSYS) |
2542 | { | |
2543 | struct sock_filter allow_filter[] = { | |
2544 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2545 | }; | |
2546 | struct sock_filter kill_filter[] = { | |
2547 | BPF_STMT(BPF_LD|BPF_W|BPF_ABS, | |
2548 | offsetof(struct seccomp_data, nr)), | |
2549 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, __NR_getpid, 0, 1), | |
2550 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL), | |
2551 | BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW), | |
2552 | }; | |
2553 | struct sock_fprog allow_prog = { | |
2554 | .len = (unsigned short)ARRAY_SIZE(allow_filter), | |
2555 | .filter = allow_filter, | |
2556 | }; | |
2557 | struct sock_fprog kill_prog = { | |
2558 | .len = (unsigned short)ARRAY_SIZE(kill_filter), | |
2559 | .filter = kill_filter, | |
2560 | }; | |
2561 | long ret; | |
2562 | pid_t parent = getppid(); | |
2563 | ||
2564 | ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0); | |
2565 | ASSERT_EQ(0, ret); | |
2566 | ||
2567 | /* Verify that the FILTER_FLAG_LOG flag isn't accepted in strict mode */ | |
2568 | ret = seccomp(SECCOMP_SET_MODE_STRICT, SECCOMP_FILTER_FLAG_LOG, | |
2569 | &allow_prog); | |
2570 | ASSERT_NE(ENOSYS, errno) { | |
2571 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2572 | } | |
2573 | EXPECT_NE(0, ret) { | |
2574 | TH_LOG("Kernel accepted FILTER_FLAG_LOG flag in strict mode!"); | |
2575 | } | |
2576 | EXPECT_EQ(EINVAL, errno) { | |
2577 | TH_LOG("Kernel returned unexpected errno for FILTER_FLAG_LOG flag in strict mode!"); | |
2578 | } | |
2579 | ||
2580 | /* Verify that a simple, permissive filter can be added with no flags */ | |
2581 | ret = seccomp(SECCOMP_SET_MODE_FILTER, 0, &allow_prog); | |
2582 | EXPECT_EQ(0, ret); | |
2583 | ||
2584 | /* See if the same filter can be added with the FILTER_FLAG_LOG flag */ | |
2585 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, | |
2586 | &allow_prog); | |
2587 | ASSERT_NE(EINVAL, errno) { | |
2588 | TH_LOG("Kernel does not support the FILTER_FLAG_LOG flag!"); | |
2589 | } | |
2590 | EXPECT_EQ(0, ret); | |
2591 | ||
2592 | /* Ensure that the kill filter works with the FILTER_FLAG_LOG flag */ | |
2593 | ret = seccomp(SECCOMP_SET_MODE_FILTER, SECCOMP_FILTER_FLAG_LOG, | |
2594 | &kill_prog); | |
2595 | EXPECT_EQ(0, ret); | |
2596 | ||
2597 | EXPECT_EQ(parent, syscall(__NR_getppid)); | |
2598 | /* getpid() should never return. */ | |
2599 | EXPECT_EQ(0, syscall(__NR_getpid)); | |
2600 | } | |
2601 | ||
d612b1fd TH |
2602 | TEST(get_action_avail) |
2603 | { | |
2604 | __u32 actions[] = { SECCOMP_RET_KILL, SECCOMP_RET_TRAP, | |
2605 | SECCOMP_RET_ERRNO, SECCOMP_RET_TRACE, | |
2606 | SECCOMP_RET_ALLOW }; | |
2607 | __u32 unknown_action = 0x10000000U; | |
2608 | int i; | |
2609 | long ret; | |
2610 | ||
2611 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[0]); | |
2612 | ASSERT_NE(ENOSYS, errno) { | |
2613 | TH_LOG("Kernel does not support seccomp syscall!"); | |
2614 | } | |
2615 | ASSERT_NE(EINVAL, errno) { | |
2616 | TH_LOG("Kernel does not support SECCOMP_GET_ACTION_AVAIL operation!"); | |
2617 | } | |
2618 | EXPECT_EQ(ret, 0); | |
2619 | ||
2620 | for (i = 0; i < ARRAY_SIZE(actions); i++) { | |
2621 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &actions[i]); | |
2622 | EXPECT_EQ(ret, 0) { | |
2623 | TH_LOG("Expected action (0x%X) not available!", | |
2624 | actions[i]); | |
2625 | } | |
2626 | } | |
2627 | ||
2628 | /* Check that an unknown action is handled properly (EOPNOTSUPP) */ | |
2629 | ret = seccomp(SECCOMP_GET_ACTION_AVAIL, 0, &unknown_action); | |
2630 | EXPECT_EQ(ret, -1); | |
2631 | EXPECT_EQ(errno, EOPNOTSUPP); | |
2632 | } | |
2633 | ||
c99ee51a KC |
2634 | /* |
2635 | * TODO: | |
2636 | * - add microbenchmarks | |
2637 | * - expand NNP testing | |
2638 | * - better arch-specific TRACE and TRAP handlers. | |
2639 | * - endianness checking when appropriate | |
2640 | * - 64-bit arg prodding | |
2641 | * - arch value testing (x86 modes especially) | |
e66a3997 | 2642 | * - verify that FILTER_FLAG_LOG filters generate log messages |
c99ee51a KC |
2643 | * - ... |
2644 | */ | |
2645 | ||
2646 | TEST_HARNESS_MAIN |