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f5e04665 LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2012 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
5430f7f2 LP |
9 | under the terms of the GNU Lesser General Public License as published by |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
f5e04665 LP |
11 | (at your option) any later version. |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
5430f7f2 | 16 | Lesser General Public License for more details. |
f5e04665 | 17 | |
5430f7f2 | 18 | You should have received a copy of the GNU Lesser General Public License |
f5e04665 LP |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. |
20 | ***/ | |
21 | ||
22 | #include <errno.h> | |
803a3464 LP |
23 | #include <stdio.h> |
24 | #include <sys/prctl.h> | |
cacd6403 | 25 | #include <sys/xattr.h> |
4f5dd394 | 26 | #include <unistd.h> |
f5e04665 | 27 | |
4d229b31 UTL |
28 | #ifdef HAVE_ELFUTILS |
29 | # include <dwarf.h> | |
30 | # include <elfutils/libdwfl.h> | |
31 | #endif | |
32 | ||
f11943c5 LP |
33 | #include "sd-journal.h" |
34 | #include "sd-login.h" | |
4f5dd394 LP |
35 | |
36 | #include "acl-util.h" | |
37 | #include "capability.h" | |
ba1261bc | 38 | #include "cgroup-util.h" |
4f5dd394 | 39 | #include "compress.h" |
34c10968 LP |
40 | #include "conf-parser.h" |
41 | #include "copy.h" | |
f11943c5 | 42 | #include "coredump-vacuum.h" |
a0956174 | 43 | #include "dirent-util.h" |
4f5dd394 | 44 | #include "escape.h" |
3ffd4af2 | 45 | #include "fd-util.h" |
4f5dd394 | 46 | #include "fileio.h" |
f4f15635 | 47 | #include "fs-util.h" |
4f5dd394 LP |
48 | #include "journald-native.h" |
49 | #include "log.h" | |
50 | #include "macro.h" | |
51 | #include "mkdir.h" | |
6bedfcbb | 52 | #include "parse-util.h" |
0b452006 | 53 | #include "process-util.h" |
4f5dd394 LP |
54 | #include "special.h" |
55 | #include "stacktrace.h" | |
07630cea | 56 | #include "string-util.h" |
4f5dd394 | 57 | #include "strv.h" |
b1d4f8e1 | 58 | #include "user-util.h" |
4f5dd394 | 59 | #include "util.h" |
34727273 | 60 | |
34c10968 | 61 | /* The maximum size up to which we process coredumps */ |
59f448cf | 62 | #define PROCESS_SIZE_MAX ((uint64_t) (2LLU*1024LLU*1024LLU*1024LLU)) |
34c10968 LP |
63 | |
64 | /* The maximum size up to which we leave the coredump around on | |
65 | * disk */ | |
66 | #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX | |
67 | ||
68 | /* The maximum size up to which we store the coredump in the | |
69 | * journal */ | |
70 | #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) | |
f5e04665 | 71 | |
c4aa09b0 | 72 | /* Make sure to not make this larger than the maximum journal entry |
874bc134 ZJS |
73 | * size. See DATA_SIZE_MAX in journald-native.c. */ |
74 | assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); | |
f5e04665 LP |
75 | |
76 | enum { | |
1eef15b1 ZJS |
77 | INFO_PID, |
78 | INFO_UID, | |
79 | INFO_GID, | |
80 | INFO_SIGNAL, | |
81 | INFO_TIMESTAMP, | |
82 | INFO_COMM, | |
83 | INFO_EXE, | |
84 | _INFO_LEN | |
f5e04665 LP |
85 | }; |
86 | ||
34c10968 LP |
87 | typedef enum CoredumpStorage { |
88 | COREDUMP_STORAGE_NONE, | |
89 | COREDUMP_STORAGE_EXTERNAL, | |
90 | COREDUMP_STORAGE_JOURNAL, | |
91 | COREDUMP_STORAGE_BOTH, | |
92 | _COREDUMP_STORAGE_MAX, | |
93 | _COREDUMP_STORAGE_INVALID = -1 | |
94 | } CoredumpStorage; | |
95 | ||
34c10968 LP |
96 | static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { |
97 | [COREDUMP_STORAGE_NONE] = "none", | |
98 | [COREDUMP_STORAGE_EXTERNAL] = "external", | |
99 | [COREDUMP_STORAGE_JOURNAL] = "journal", | |
100 | [COREDUMP_STORAGE_BOTH] = "both", | |
101 | }; | |
102 | ||
103 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); | |
8c9571d0 | 104 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); |
34727273 ZJS |
105 | |
106 | static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
8c9571d0 | 107 | static bool arg_compress = true; |
59f448cf LP |
108 | static uint64_t arg_process_size_max = PROCESS_SIZE_MAX; |
109 | static uint64_t arg_external_size_max = EXTERNAL_SIZE_MAX; | |
34727273 | 110 | static size_t arg_journal_size_max = JOURNAL_SIZE_MAX; |
59f448cf LP |
111 | static uint64_t arg_keep_free = (uint64_t) -1; |
112 | static uint64_t arg_max_use = (uint64_t) -1; | |
34c10968 LP |
113 | |
114 | static int parse_config(void) { | |
34c10968 | 115 | static const ConfigTableItem items[] = { |
8c9571d0 LP |
116 | { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
117 | { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, | |
59f448cf LP |
118 | { "Coredump", "ProcessSizeMax", config_parse_iec_uint64, 0, &arg_process_size_max }, |
119 | { "Coredump", "ExternalSizeMax", config_parse_iec_uint64, 0, &arg_external_size_max }, | |
8c9571d0 | 120 | { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, |
59f448cf LP |
121 | { "Coredump", "KeepFree", config_parse_iec_uint64, 0, &arg_keep_free }, |
122 | { "Coredump", "MaxUse", config_parse_iec_uint64, 0, &arg_max_use }, | |
34c10968 LP |
123 | {} |
124 | }; | |
125 | ||
301af7e4 JT |
126 | return config_parse_many("/etc/systemd/coredump.conf", |
127 | CONF_DIRS_NULSTR("systemd/coredump.conf"), | |
128 | "Coredump\0", | |
129 | config_item_table_lookup, items, | |
130 | false, NULL); | |
34c10968 LP |
131 | } |
132 | ||
133 | static int fix_acl(int fd, uid_t uid) { | |
134 | ||
135 | #ifdef HAVE_ACL | |
136 | _cleanup_(acl_freep) acl_t acl = NULL; | |
137 | acl_entry_t entry; | |
138 | acl_permset_t permset; | |
139 | ||
b59233e6 LP |
140 | assert(fd >= 0); |
141 | ||
34c10968 LP |
142 | if (uid <= SYSTEM_UID_MAX) |
143 | return 0; | |
144 | ||
145 | /* Make sure normal users can read (but not write or delete) | |
146 | * their own coredumps */ | |
147 | ||
148 | acl = acl_get_fd(fd); | |
4a62c710 MS |
149 | if (!acl) |
150 | return log_error_errno(errno, "Failed to get ACL: %m"); | |
34c10968 LP |
151 | |
152 | if (acl_create_entry(&acl, &entry) < 0 || | |
153 | acl_set_tag_type(entry, ACL_USER) < 0 || | |
154 | acl_set_qualifier(entry, &uid) < 0) { | |
56f64d95 | 155 | log_error_errno(errno, "Failed to patch ACL: %m"); |
34c10968 LP |
156 | return -errno; |
157 | } | |
158 | ||
159 | if (acl_get_permset(entry, &permset) < 0 || | |
160 | acl_add_perm(permset, ACL_READ) < 0 || | |
161 | calc_acl_mask_if_needed(&acl) < 0) { | |
56f64d95 | 162 | log_warning_errno(errno, "Failed to patch ACL: %m"); |
34c10968 LP |
163 | return -errno; |
164 | } | |
165 | ||
4a62c710 MS |
166 | if (acl_set_fd(fd, acl) < 0) |
167 | return log_error_errno(errno, "Failed to apply ACL: %m"); | |
34c10968 LP |
168 | #endif |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
1eef15b1 | 173 | static int fix_xattr(int fd, const char *info[_INFO_LEN]) { |
0cd77f97 | 174 | |
1eef15b1 ZJS |
175 | static const char * const xattrs[_INFO_LEN] = { |
176 | [INFO_PID] = "user.coredump.pid", | |
177 | [INFO_UID] = "user.coredump.uid", | |
178 | [INFO_GID] = "user.coredump.gid", | |
179 | [INFO_SIGNAL] = "user.coredump.signal", | |
180 | [INFO_TIMESTAMP] = "user.coredump.timestamp", | |
181 | [INFO_COMM] = "user.coredump.comm", | |
182 | [INFO_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
183 | }; |
184 | ||
34c10968 | 185 | int r = 0; |
0cd77f97 | 186 | unsigned i; |
34c10968 | 187 | |
b59233e6 LP |
188 | assert(fd >= 0); |
189 | ||
1eef15b1 | 190 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
191 | * attributes. Just because we can. */ |
192 | ||
1eef15b1 ZJS |
193 | for (i = 0; i < _INFO_LEN; i++) { |
194 | int k; | |
195 | ||
196 | if (isempty(info[i]) || !xattrs[i]) | |
0cd77f97 | 197 | continue; |
34c10968 | 198 | |
1eef15b1 ZJS |
199 | k = fsetxattr(fd, xattrs[i], info[i], strlen(info[i]), XATTR_CREATE); |
200 | if (k < 0 && r == 0) | |
34c10968 | 201 | r = -errno; |
0cd77f97 | 202 | } |
34c10968 LP |
203 | |
204 | return r; | |
205 | } | |
206 | ||
b0b21dce | 207 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 208 | |
b59233e6 LP |
209 | static int fix_permissions( |
210 | int fd, | |
211 | const char *filename, | |
212 | const char *target, | |
213 | const char *info[_INFO_LEN], | |
214 | uid_t uid) { | |
215 | ||
216 | assert(fd >= 0); | |
217 | assert(filename); | |
218 | assert(target); | |
219 | assert(info); | |
cfd652ed ZJS |
220 | |
221 | /* Ignore errors on these */ | |
222 | fchmod(fd, 0640); | |
223 | fix_acl(fd, uid); | |
224 | fix_xattr(fd, info); | |
225 | ||
4a62c710 MS |
226 | if (fsync(fd) < 0) |
227 | return log_error_errno(errno, "Failed to sync coredump %s: %m", filename); | |
cfd652ed | 228 | |
4a62c710 MS |
229 | if (rename(filename, target) < 0) |
230 | return log_error_errno(errno, "Failed to rename coredump %s -> %s: %m", filename, target); | |
cfd652ed ZJS |
231 | |
232 | return 0; | |
233 | } | |
234 | ||
59f448cf | 235 | static int maybe_remove_external_coredump(const char *filename, uint64_t size) { |
cfd652ed | 236 | |
b59233e6 | 237 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed ZJS |
238 | |
239 | if (IN_SET(arg_storage, COREDUMP_STORAGE_EXTERNAL, COREDUMP_STORAGE_BOTH) && | |
240 | size <= arg_external_size_max) | |
241 | return 0; | |
242 | ||
243 | if (!filename) | |
244 | return 1; | |
245 | ||
4a62c710 MS |
246 | if (unlink(filename) < 0 && errno != ENOENT) |
247 | return log_error_errno(errno, "Failed to unlink %s: %m", filename); | |
cfd652ed ZJS |
248 | |
249 | return 1; | |
250 | } | |
251 | ||
b59233e6 LP |
252 | static int make_filename(const char *info[_INFO_LEN], char **ret) { |
253 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; | |
a7f7d1bd | 254 | sd_id128_t boot = {}; |
34c10968 LP |
255 | int r; |
256 | ||
1eef15b1 | 257 | assert(info); |
34c10968 | 258 | |
1eef15b1 | 259 | c = filename_escape(info[INFO_COMM]); |
34c10968 | 260 | if (!c) |
b59233e6 | 261 | return -ENOMEM; |
34c10968 | 262 | |
0dc5d23c LP |
263 | u = filename_escape(info[INFO_UID]); |
264 | if (!u) | |
b59233e6 | 265 | return -ENOMEM; |
34c10968 LP |
266 | |
267 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 268 | if (r < 0) |
34c10968 | 269 | return r; |
34c10968 | 270 | |
b59233e6 LP |
271 | p = filename_escape(info[INFO_PID]); |
272 | if (!p) | |
273 | return -ENOMEM; | |
274 | ||
275 | t = filename_escape(info[INFO_TIMESTAMP]); | |
276 | if (!t) | |
277 | return -ENOMEM; | |
278 | ||
279 | if (asprintf(ret, | |
0dc5d23c | 280 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s000000", |
34c10968 | 281 | c, |
0dc5d23c | 282 | u, |
34c10968 LP |
283 | SD_ID128_FORMAT_VAL(boot), |
284 | p, | |
b59233e6 LP |
285 | t) < 0) |
286 | return -ENOMEM; | |
287 | ||
288 | return 0; | |
289 | } | |
290 | ||
291 | static int save_external_coredump( | |
292 | const char *info[_INFO_LEN], | |
293 | uid_t uid, | |
294 | char **ret_filename, | |
295 | int *ret_fd, | |
59f448cf | 296 | uint64_t *ret_size) { |
b59233e6 LP |
297 | |
298 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
299 | _cleanup_close_ int fd = -1; | |
300 | struct stat st; | |
301 | int r; | |
302 | ||
303 | assert(info); | |
304 | assert(ret_filename); | |
305 | assert(ret_fd); | |
306 | assert(ret_size); | |
307 | ||
308 | r = make_filename(info, &fn); | |
23bbb0de MS |
309 | if (r < 0) |
310 | return log_error_errno(r, "Failed to determine coredump file name: %m"); | |
34c10968 | 311 | |
14bcf25c | 312 | r = tempfn_random(fn, NULL, &tmp); |
ae6c3cc0 LP |
313 | if (r < 0) |
314 | return log_error_errno(r, "Failed to determine temporary file name: %m"); | |
803a3464 | 315 | |
d2e54fae | 316 | mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 317 | |
34c10968 | 318 | fd = open(tmp, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
4a62c710 MS |
319 | if (fd < 0) |
320 | return log_error_errno(errno, "Failed to create coredump file %s: %m", tmp); | |
803a3464 | 321 | |
7430ec6a | 322 | r = copy_bytes(STDIN_FILENO, fd, arg_process_size_max, false); |
84ee0960 | 323 | if (r == -EFBIG) { |
0dc5d23c | 324 | log_error("Coredump of %s (%s) is larger than configured processing limit, refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
325 | goto fail; |
326 | } else if (IN_SET(r, -EDQUOT, -ENOSPC)) { | |
0dc5d23c | 327 | log_error("Not enough disk space for coredump of %s (%s), refusing.", info[INFO_PID], info[INFO_COMM]); |
93240d3a LP |
328 | goto fail; |
329 | } else if (r < 0) { | |
da927ba9 | 330 | log_error_errno(r, "Failed to dump coredump to file: %m"); |
34c10968 LP |
331 | goto fail; |
332 | } | |
803a3464 | 333 | |
34c10968 | 334 | if (fstat(fd, &st) < 0) { |
56f64d95 | 335 | log_error_errno(errno, "Failed to fstat coredump %s: %m", tmp); |
34c10968 LP |
336 | goto fail; |
337 | } | |
338 | ||
7849c2ac | 339 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
56f64d95 | 340 | log_error_errno(errno, "Failed to seek on %s: %m", tmp); |
b59233e6 | 341 | goto fail; |
7849c2ac TA |
342 | } |
343 | ||
d89c8fdf | 344 | #if defined(HAVE_XZ) || defined(HAVE_LZ4) |
cfd652ed | 345 | /* If we will remove the coredump anyway, do not compress. */ |
34727273 | 346 | if (maybe_remove_external_coredump(NULL, st.st_size) == 0 |
8c9571d0 | 347 | && arg_compress) { |
cfd652ed | 348 | |
b59233e6 LP |
349 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
350 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 351 | |
d89c8fdf | 352 | fn_compressed = strappend(fn, COMPRESSED_EXT); |
b59233e6 | 353 | if (!fn_compressed) { |
d89c8fdf | 354 | log_oom(); |
cfd652ed ZJS |
355 | goto uncompressed; |
356 | } | |
357 | ||
14bcf25c | 358 | r = tempfn_random(fn_compressed, NULL, &tmp_compressed); |
ae6c3cc0 LP |
359 | if (r < 0) { |
360 | log_error_errno(r, "Failed to determine temporary file name for %s: %m", fn_compressed); | |
b59233e6 | 361 | goto uncompressed; |
cfd652ed ZJS |
362 | } |
363 | ||
b59233e6 LP |
364 | fd_compressed = open(tmp_compressed, O_CREAT|O_EXCL|O_RDWR|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0640); |
365 | if (fd_compressed < 0) { | |
56f64d95 | 366 | log_error_errno(errno, "Failed to create file %s: %m", tmp_compressed); |
b59233e6 | 367 | goto uncompressed; |
cfd652ed ZJS |
368 | } |
369 | ||
d89c8fdf | 370 | r = compress_stream(fd, fd_compressed, -1); |
b59233e6 | 371 | if (r < 0) { |
da927ba9 | 372 | log_error_errno(r, "Failed to compress %s: %m", tmp_compressed); |
b59233e6 LP |
373 | goto fail_compressed; |
374 | } | |
375 | ||
376 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, info, uid); | |
cfd652ed | 377 | if (r < 0) |
b59233e6 LP |
378 | goto fail_compressed; |
379 | ||
380 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
381 | unlink_noerrno(tmp); | |
cfd652ed | 382 | |
59f448cf LP |
383 | *ret_filename = fn_compressed; /* compressed */ |
384 | *ret_fd = fd; /* uncompressed */ | |
385 | *ret_size = (uint64_t) st.st_size; /* uncompressed */ | |
cfd652ed | 386 | |
b59233e6 | 387 | fn_compressed = NULL; |
cfd652ed ZJS |
388 | fd = -1; |
389 | ||
390 | return 0; | |
391 | ||
b59233e6 LP |
392 | fail_compressed: |
393 | unlink_noerrno(tmp_compressed); | |
34c10968 | 394 | } |
cfd652ed ZJS |
395 | |
396 | uncompressed: | |
3b1a55e1 | 397 | #endif |
cfd652ed ZJS |
398 | r = fix_permissions(fd, tmp, fn, info, uid); |
399 | if (r < 0) | |
400 | goto fail; | |
34c10968 LP |
401 | |
402 | *ret_filename = fn; | |
403 | *ret_fd = fd; | |
59f448cf | 404 | *ret_size = (uint64_t) st.st_size; |
34c10968 LP |
405 | |
406 | fn = NULL; | |
407 | fd = -1; | |
408 | ||
409 | return 0; | |
410 | ||
411 | fail: | |
412 | unlink_noerrno(tmp); | |
413 | return r; | |
414 | } | |
415 | ||
416 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
417 | _cleanup_free_ char *field = NULL; | |
418 | ssize_t n; | |
419 | ||
8d4e028f | 420 | assert(fd >= 0); |
34c10968 LP |
421 | assert(ret); |
422 | assert(ret_size); | |
423 | ||
4a62c710 MS |
424 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
425 | return log_warning_errno(errno, "Failed to seek: %m"); | |
803a3464 | 426 | |
34c10968 LP |
427 | field = malloc(9 + size); |
428 | if (!field) { | |
cfd652ed | 429 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
430 | return -ENOMEM; |
431 | } | |
432 | ||
433 | memcpy(field, "COREDUMP=", 9); | |
434 | ||
435 | n = read(fd, field + 9, size); | |
23bbb0de MS |
436 | if (n < 0) |
437 | return log_error_errno((int) n, "Failed to read core data: %m"); | |
34c10968 LP |
438 | if ((size_t) n < size) { |
439 | log_error("Core data too short."); | |
440 | return -EIO; | |
441 | } | |
442 | ||
443 | *ret = field; | |
444 | *ret_size = size + 9; | |
445 | ||
446 | field = NULL; | |
447 | ||
448 | return 0; | |
449 | } | |
803a3464 | 450 | |
3f132692 JF |
451 | /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: |
452 | * 0:/dev/pts/23 | |
453 | * pos: 0 | |
454 | * flags: 0100002 | |
455 | * | |
456 | * 1:/dev/pts/23 | |
457 | * pos: 0 | |
458 | * flags: 0100002 | |
459 | * | |
460 | * 2:/dev/pts/23 | |
461 | * pos: 0 | |
462 | * flags: 0100002 | |
463 | * EOF | |
464 | */ | |
465 | static int compose_open_fds(pid_t pid, char **open_fds) { | |
4d84bc2f LP |
466 | _cleanup_closedir_ DIR *proc_fd_dir = NULL; |
467 | _cleanup_close_ int proc_fdinfo_fd = -1; | |
468 | _cleanup_free_ char *buffer = NULL; | |
3f132692 | 469 | _cleanup_fclose_ FILE *stream = NULL; |
59059b4a | 470 | const char *fddelim = "", *path; |
3f132692 | 471 | struct dirent *dent = NULL; |
4d84bc2f | 472 | size_t size = 0; |
3f132692 JF |
473 | int r = 0; |
474 | ||
475 | assert(pid >= 0); | |
476 | assert(open_fds != NULL); | |
477 | ||
59059b4a | 478 | path = procfs_file_alloca(pid, "fd"); |
3f132692 | 479 | proc_fd_dir = opendir(path); |
59059b4a ZJS |
480 | if (!proc_fd_dir) |
481 | return -errno; | |
3f132692 | 482 | |
4d84bc2f | 483 | proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH); |
59059b4a ZJS |
484 | if (proc_fdinfo_fd < 0) |
485 | return -errno; | |
3f132692 | 486 | |
4d84bc2f | 487 | stream = open_memstream(&buffer, &size); |
3f132692 JF |
488 | if (!stream) |
489 | return -ENOMEM; | |
490 | ||
4d84bc2f | 491 | FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { |
3f132692 | 492 | _cleanup_fclose_ FILE *fdinfo = NULL; |
4d84bc2f | 493 | _cleanup_free_ char *fdname = NULL; |
59059b4a | 494 | char line[LINE_MAX]; |
4d84bc2f | 495 | int fd; |
3f132692 | 496 | |
59059b4a | 497 | r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname); |
3f132692 JF |
498 | if (r < 0) |
499 | return r; | |
500 | ||
501 | fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); | |
502 | fddelim = "\n"; | |
503 | ||
504 | /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ | |
59059b4a ZJS |
505 | fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY); |
506 | if (fd < 0) | |
3f132692 JF |
507 | continue; |
508 | ||
59059b4a ZJS |
509 | fdinfo = fdopen(fd, "re"); |
510 | if (fdinfo == NULL) { | |
511 | close(fd); | |
3f132692 | 512 | continue; |
59059b4a | 513 | } |
3f132692 | 514 | |
4d84bc2f LP |
515 | FOREACH_LINE(line, fdinfo, break) { |
516 | fputs(line, stream); | |
517 | if (!endswith(line, "\n")) | |
518 | fputc('\n', stream); | |
519 | } | |
3f132692 JF |
520 | } |
521 | ||
4d84bc2f | 522 | errno = 0; |
74ca738f | 523 | stream = safe_fclose(stream); |
4d84bc2f LP |
524 | |
525 | if (errno != 0) | |
526 | return -errno; | |
527 | ||
528 | *open_fds = buffer; | |
529 | buffer = NULL; | |
530 | ||
3f132692 JF |
531 | return 0; |
532 | } | |
533 | ||
f5e04665 | 534 | int main(int argc, char* argv[]) { |
34c10968 | 535 | |
8c8549db LP |
536 | /* The small core field we allocate on the stack, to keep things simple */ |
537 | char | |
538 | *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
539 | *core_session = NULL, *core_exe = NULL, *core_comm = NULL, *core_cmdline = NULL, | |
540 | *core_cgroup = NULL, *core_cwd = NULL, *core_root = NULL, *core_unit = NULL, | |
541 | *core_slice = NULL; | |
542 | ||
543 | /* The larger ones we allocate on the heap */ | |
544 | _cleanup_free_ char | |
545 | *core_timestamp = NULL, *core_message = NULL, *coredump_data = NULL, *core_owner_uid = NULL, | |
546 | *core_open_fds = NULL, *core_proc_status = NULL, *core_proc_maps = NULL, *core_proc_limits = NULL, | |
547 | *core_proc_cgroup = NULL, *core_environ = NULL; | |
548 | ||
549 | _cleanup_free_ char *exe = NULL, *comm = NULL, *filename = NULL; | |
1eef15b1 | 550 | const char *info[_INFO_LEN]; |
34c10968 LP |
551 | |
552 | _cleanup_close_ int coredump_fd = -1; | |
553 | ||
3f132692 | 554 | struct iovec iovec[26]; |
59f448cf | 555 | uint64_t coredump_size; |
f5e04665 | 556 | int r, j = 0; |
a035f819 | 557 | uid_t uid, owner_uid; |
fee80f69 | 558 | gid_t gid; |
a035f819 | 559 | pid_t pid; |
34c10968 | 560 | char *t; |
3f132692 | 561 | const char *p; |
f5e04665 | 562 | |
34c10968 | 563 | /* Make sure we never enter a loop */ |
803a3464 | 564 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 | 565 | |
34c10968 LP |
566 | /* First, log to a safe place, since we don't know what |
567 | * crashed and it might be journald which we'd rather not log | |
568 | * to then. */ | |
569 | log_set_target(LOG_TARGET_KMSG); | |
34c10968 | 570 | log_open(); |
803a3464 | 571 | |
1eef15b1 ZJS |
572 | if (argc < INFO_COMM + 1) { |
573 | log_error("Not enough arguments passed from kernel (%d, expected %d).", | |
574 | argc - 1, INFO_COMM + 1 - 1); | |
f5e04665 LP |
575 | r = -EINVAL; |
576 | goto finish; | |
577 | } | |
578 | ||
34c10968 LP |
579 | /* Ignore all parse errors */ |
580 | parse_config(); | |
8c9571d0 LP |
581 | |
582 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); | |
583 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
34c10968 | 584 | |
1eef15b1 | 585 | r = parse_uid(argv[INFO_UID + 1], &uid); |
f5e04665 | 586 | if (r < 0) { |
34c10968 LP |
587 | log_error("Failed to parse UID."); |
588 | goto finish; | |
589 | } | |
803a3464 | 590 | |
1eef15b1 | 591 | r = parse_pid(argv[INFO_PID + 1], &pid); |
34c10968 | 592 | if (r < 0) { |
f5e04665 | 593 | log_error("Failed to parse PID."); |
f5e04665 LP |
594 | goto finish; |
595 | } | |
596 | ||
1eef15b1 | 597 | r = parse_gid(argv[INFO_GID + 1], &gid); |
34c10968 LP |
598 | if (r < 0) { |
599 | log_error("Failed to parse GID."); | |
600 | goto finish; | |
601 | } | |
602 | ||
1eef15b1 | 603 | if (get_process_comm(pid, &comm) < 0) { |
3f85ef0f | 604 | log_warning("Failed to get COMM, falling back to the command line."); |
1eef15b1 ZJS |
605 | comm = strv_join(argv + INFO_COMM + 1, " "); |
606 | } | |
607 | ||
608 | if (get_process_exe(pid, &exe) < 0) | |
609 | log_warning("Failed to get EXE."); | |
610 | ||
611 | info[INFO_PID] = argv[INFO_PID + 1]; | |
612 | info[INFO_UID] = argv[INFO_UID + 1]; | |
613 | info[INFO_GID] = argv[INFO_GID + 1]; | |
614 | info[INFO_SIGNAL] = argv[INFO_SIGNAL + 1]; | |
615 | info[INFO_TIMESTAMP] = argv[INFO_TIMESTAMP + 1]; | |
616 | info[INFO_COMM] = comm; | |
617 | info[INFO_EXE] = exe; | |
618 | ||
ba1261bc | 619 | if (cg_pid_get_unit(pid, &t) >= 0) { |
803a3464 LP |
620 | |
621 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
8c8549db | 622 | free(t); |
803a3464 | 623 | |
34c10968 LP |
624 | /* If we are journald, we cut things short, |
625 | * don't write to the journal, but still | |
626 | * create a coredump. */ | |
627 | ||
628 | if (arg_storage != COREDUMP_STORAGE_NONE) | |
629 | arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
630 | ||
9fe13294 | 631 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 LP |
632 | if (r < 0) |
633 | goto finish; | |
634 | ||
9fe13294 | 635 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
636 | if (r < 0) |
637 | goto finish; | |
638 | ||
9fe13294 | 639 | log_info("Detected coredump of the journal daemon itself, diverted to %s.", filename); |
803a3464 LP |
640 | goto finish; |
641 | } | |
642 | ||
63c372cb | 643 | core_unit = strjoina("COREDUMP_UNIT=", t); |
8c8549db LP |
644 | free(t); |
645 | ||
646 | } else if (cg_pid_get_user_unit(pid, &t) >= 0) { | |
63c372cb | 647 | core_unit = strjoina("COREDUMP_USER_UNIT=", t); |
8c8549db LP |
648 | free(t); |
649 | } | |
803a3464 | 650 | |
f9045468 MT |
651 | if (core_unit) |
652 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
653 | ||
34c10968 LP |
654 | /* OK, now we know it's not the journal, hence we can make use |
655 | * of it now. */ | |
803a3464 LP |
656 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
657 | log_open(); | |
658 | ||
63c372cb | 659 | core_pid = strjoina("COREDUMP_PID=", info[INFO_PID]); |
8c8549db | 660 | IOVEC_SET_STRING(iovec[j++], core_pid); |
f5e04665 | 661 | |
63c372cb | 662 | core_uid = strjoina("COREDUMP_UID=", info[INFO_UID]); |
8c8549db | 663 | IOVEC_SET_STRING(iovec[j++], core_uid); |
f5e04665 | 664 | |
63c372cb | 665 | core_gid = strjoina("COREDUMP_GID=", info[INFO_GID]); |
8c8549db | 666 | IOVEC_SET_STRING(iovec[j++], core_gid); |
f5e04665 | 667 | |
63c372cb | 668 | core_signal = strjoina("COREDUMP_SIGNAL=", info[INFO_SIGNAL]); |
8c8549db | 669 | IOVEC_SET_STRING(iovec[j++], core_signal); |
f5e04665 | 670 | |
f5e04665 | 671 | if (sd_pid_get_session(pid, &t) >= 0) { |
63c372cb | 672 | core_session = strjoina("COREDUMP_SESSION=", t); |
f5e04665 LP |
673 | free(t); |
674 | ||
8c8549db | 675 | IOVEC_SET_STRING(iovec[j++], core_session); |
f5e04665 LP |
676 | } |
677 | ||
a035f819 | 678 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
7de80bfe KZ |
679 | r = asprintf(&core_owner_uid, |
680 | "COREDUMP_OWNER_UID=" UID_FMT, owner_uid); | |
681 | if (r > 0) | |
a035f819 LP |
682 | IOVEC_SET_STRING(iovec[j++], core_owner_uid); |
683 | } | |
684 | ||
685 | if (sd_pid_get_slice(pid, &t) >= 0) { | |
63c372cb | 686 | core_slice = strjoina("COREDUMP_SLICE=", t); |
a035f819 LP |
687 | free(t); |
688 | ||
8c8549db | 689 | IOVEC_SET_STRING(iovec[j++], core_slice); |
a035f819 LP |
690 | } |
691 | ||
1eef15b1 | 692 | if (comm) { |
63c372cb | 693 | core_comm = strjoina("COREDUMP_COMM=", comm); |
8c8549db | 694 | IOVEC_SET_STRING(iovec[j++], core_comm); |
1eef15b1 ZJS |
695 | } |
696 | ||
697 | if (exe) { | |
63c372cb | 698 | core_exe = strjoina("COREDUMP_EXE=", exe); |
8c8549db | 699 | IOVEC_SET_STRING(iovec[j++], core_exe); |
f5e04665 LP |
700 | } |
701 | ||
9bdbc2e2 | 702 | if (get_process_cmdline(pid, 0, false, &t) >= 0) { |
63c372cb | 703 | core_cmdline = strjoina("COREDUMP_CMDLINE=", t); |
f5e04665 LP |
704 | free(t); |
705 | ||
8c8549db | 706 | IOVEC_SET_STRING(iovec[j++], core_cmdline); |
f5e04665 LP |
707 | } |
708 | ||
a035f819 | 709 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) { |
63c372cb | 710 | core_cgroup = strjoina("COREDUMP_CGROUP=", t); |
a035f819 LP |
711 | free(t); |
712 | ||
8c8549db | 713 | IOVEC_SET_STRING(iovec[j++], core_cgroup); |
a035f819 LP |
714 | } |
715 | ||
3f132692 JF |
716 | if (compose_open_fds(pid, &t) >= 0) { |
717 | core_open_fds = strappend("COREDUMP_OPEN_FDS=", t); | |
718 | free(t); | |
719 | ||
720 | if (core_open_fds) | |
721 | IOVEC_SET_STRING(iovec[j++], core_open_fds); | |
722 | } | |
723 | ||
724 | p = procfs_file_alloca(pid, "status"); | |
725 | if (read_full_file(p, &t, NULL) >= 0) { | |
726 | core_proc_status = strappend("COREDUMP_PROC_STATUS=", t); | |
727 | free(t); | |
728 | ||
729 | if (core_proc_status) | |
730 | IOVEC_SET_STRING(iovec[j++], core_proc_status); | |
731 | } | |
732 | ||
733 | p = procfs_file_alloca(pid, "maps"); | |
734 | if (read_full_file(p, &t, NULL) >= 0) { | |
735 | core_proc_maps = strappend("COREDUMP_PROC_MAPS=", t); | |
736 | free(t); | |
737 | ||
738 | if (core_proc_maps) | |
739 | IOVEC_SET_STRING(iovec[j++], core_proc_maps); | |
740 | } | |
741 | ||
742 | p = procfs_file_alloca(pid, "limits"); | |
743 | if (read_full_file(p, &t, NULL) >= 0) { | |
744 | core_proc_limits = strappend("COREDUMP_PROC_LIMITS=", t); | |
745 | free(t); | |
746 | ||
747 | if (core_proc_limits) | |
748 | IOVEC_SET_STRING(iovec[j++], core_proc_limits); | |
749 | } | |
750 | ||
751 | p = procfs_file_alloca(pid, "cgroup"); | |
752 | if (read_full_file(p, &t, NULL) >=0) { | |
753 | core_proc_cgroup = strappend("COREDUMP_PROC_CGROUP=", t); | |
754 | free(t); | |
755 | ||
756 | if (core_proc_cgroup) | |
757 | IOVEC_SET_STRING(iovec[j++], core_proc_cgroup); | |
758 | } | |
759 | ||
760 | if (get_process_cwd(pid, &t) >= 0) { | |
63c372cb | 761 | core_cwd = strjoina("COREDUMP_CWD=", t); |
3f132692 JF |
762 | free(t); |
763 | ||
8c8549db | 764 | IOVEC_SET_STRING(iovec[j++], core_cwd); |
3f132692 JF |
765 | } |
766 | ||
767 | if (get_process_root(pid, &t) >= 0) { | |
63c372cb | 768 | core_root = strjoina("COREDUMP_ROOT=", t); |
3f132692 JF |
769 | free(t); |
770 | ||
8c8549db | 771 | IOVEC_SET_STRING(iovec[j++], core_root); |
3f132692 JF |
772 | } |
773 | ||
774 | if (get_process_environ(pid, &t) >= 0) { | |
775 | core_environ = strappend("COREDUMP_ENVIRON=", t); | |
776 | free(t); | |
777 | ||
778 | if (core_environ) | |
779 | IOVEC_SET_STRING(iovec[j++], core_environ); | |
780 | } | |
781 | ||
1eef15b1 | 782 | core_timestamp = strjoin("COREDUMP_TIMESTAMP=", info[INFO_TIMESTAMP], "000000", NULL); |
f5e04665 LP |
783 | if (core_timestamp) |
784 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
785 | ||
786 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
787 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
788 | ||
0dc5d23c LP |
789 | /* Vacuum before we write anything again */ |
790 | coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
791 | ||
34c10968 | 792 | /* Always stream the coredump to disk, if that's possible */ |
9fe13294 | 793 | r = save_external_coredump(info, uid, &filename, &coredump_fd, &coredump_size); |
34c10968 | 794 | if (r < 0) |
2424a475 ZJS |
795 | /* skip whole core dumping part */ |
796 | goto log; | |
34c10968 LP |
797 | |
798 | /* If we don't want to keep the coredump on disk, remove it | |
8d4e028f LP |
799 | * now, as later on we will lack the privileges for |
800 | * it. However, we keep the fd to it, so that we can still | |
801 | * process it and log it. */ | |
9fe13294 | 802 | r = maybe_remove_external_coredump(filename, coredump_size); |
34c10968 LP |
803 | if (r < 0) |
804 | goto finish; | |
9fe13294 ZJS |
805 | if (r == 0) { |
806 | const char *coredump_filename; | |
807 | ||
63c372cb | 808 | coredump_filename = strjoina("COREDUMP_FILENAME=", filename); |
9fe13294 ZJS |
809 | IOVEC_SET_STRING(iovec[j++], coredump_filename); |
810 | } | |
34c10968 | 811 | |
0dc5d23c LP |
812 | /* Vacuum again, but exclude the coredump we just created */ |
813 | coredump_vacuum(coredump_fd, arg_keep_free, arg_max_use); | |
814 | ||
fee80f69 LP |
815 | /* Now, let's drop privileges to become the user who owns the |
816 | * segfaulted process and allocate the coredump memory under | |
b26c631a KP |
817 | * the user's uid. This also ensures that the credentials |
818 | * journald will see are the ones of the coredumping user, | |
f11943c5 LP |
819 | * thus making sure the user gets access to the core |
820 | * dump. Let's also get rid of all capabilities, if we run as | |
821 | * root, we won't need them anymore. */ | |
822 | r = drop_privileges(uid, gid, 0); | |
823 | if (r < 0) { | |
824 | log_error_errno(r, "Failed to drop privileges: %m"); | |
fee80f69 LP |
825 | goto finish; |
826 | } | |
827 | ||
8d4e028f LP |
828 | #ifdef HAVE_ELFUTILS |
829 | /* Try to get a strack trace if we can */ | |
830 | if (coredump_size <= arg_process_size_max) { | |
831 | _cleanup_free_ char *stacktrace = NULL; | |
832 | ||
833 | r = coredump_make_stack_trace(coredump_fd, exe, &stacktrace); | |
834 | if (r >= 0) | |
1eef15b1 | 835 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.\n\n", stacktrace, NULL); |
4d229b31 UTL |
836 | else if (r == -EINVAL) |
837 | log_warning("Failed to generate stack trace: %s", dwfl_errmsg(dwfl_errno())); | |
8d4e028f | 838 | else |
da927ba9 | 839 | log_warning_errno(r, "Failed to generate stack trace: %m"); |
8d4e028f LP |
840 | } |
841 | ||
842 | if (!core_message) | |
843 | #endif | |
2424a475 | 844 | log: |
1eef15b1 | 845 | core_message = strjoin("MESSAGE=Process ", info[INFO_PID], " (", comm, ") of user ", info[INFO_UID], " dumped core.", NULL); |
8d4e028f LP |
846 | if (core_message) |
847 | IOVEC_SET_STRING(iovec[j++], core_message); | |
848 | ||
34c10968 LP |
849 | /* Optionally store the entire coredump in the journal */ |
850 | if (IN_SET(arg_storage, COREDUMP_STORAGE_JOURNAL, COREDUMP_STORAGE_BOTH) && | |
59f448cf | 851 | coredump_size <= arg_journal_size_max) { |
a7f7d1bd | 852 | size_t sz = 0; |
fee80f69 | 853 | |
34c10968 | 854 | /* Store the coredump itself in the journal */ |
fee80f69 | 855 | |
34c10968 LP |
856 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); |
857 | if (r >= 0) { | |
858 | iovec[j].iov_base = coredump_data; | |
859 | iovec[j].iov_len = sz; | |
860 | j++; | |
ca0ceb6f | 861 | } |
fee80f69 LP |
862 | } |
863 | ||
f5e04665 LP |
864 | r = sd_journal_sendv(iovec, j); |
865 | if (r < 0) | |
da927ba9 | 866 | log_error_errno(r, "Failed to log coredump: %m"); |
f5e04665 LP |
867 | |
868 | finish: | |
f5e04665 LP |
869 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; |
870 | } |