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Commit | Line | Data |
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db9ecf05 | 1 | /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
f5e04665 LP |
2 | |
3 | #include <errno.h> | |
803a3464 LP |
4 | #include <stdio.h> |
5 | #include <sys/prctl.h> | |
cacd6403 | 6 | #include <sys/xattr.h> |
4f5dd394 | 7 | #include <unistd.h> |
f5e04665 | 8 | |
349cc4a5 | 9 | #if HAVE_ELFUTILS |
3c171f0b LP |
10 | #include <dwarf.h> |
11 | #include <elfutils/libdwfl.h> | |
4d229b31 UTL |
12 | #endif |
13 | ||
73a99163 | 14 | #include "sd-daemon.h" |
f11943c5 LP |
15 | #include "sd-journal.h" |
16 | #include "sd-login.h" | |
73a99163 | 17 | #include "sd-messages.h" |
4f5dd394 LP |
18 | |
19 | #include "acl-util.h" | |
b5efdb8a | 20 | #include "alloc-util.h" |
430f0182 | 21 | #include "capability-util.h" |
ba1261bc | 22 | #include "cgroup-util.h" |
4f5dd394 | 23 | #include "compress.h" |
34c10968 LP |
24 | #include "conf-parser.h" |
25 | #include "copy.h" | |
f11943c5 | 26 | #include "coredump-vacuum.h" |
a0956174 | 27 | #include "dirent-util.h" |
4f5dd394 | 28 | #include "escape.h" |
3ffd4af2 | 29 | #include "fd-util.h" |
4f5dd394 | 30 | #include "fileio.h" |
f4f15635 | 31 | #include "fs-util.h" |
afc5dbf3 | 32 | #include "io-util.h" |
b18453ed | 33 | #include "journal-importer.h" |
4f5dd394 LP |
34 | #include "log.h" |
35 | #include "macro.h" | |
5e332028 | 36 | #include "main-func.h" |
0a970718 | 37 | #include "memory-util.h" |
4f5dd394 | 38 | #include "mkdir.h" |
6bedfcbb | 39 | #include "parse-util.h" |
0b452006 | 40 | #include "process-util.h" |
d14bcb4e | 41 | #include "signal-util.h" |
3c171f0b | 42 | #include "socket-util.h" |
4f5dd394 LP |
43 | #include "special.h" |
44 | #include "stacktrace.h" | |
8b43440b | 45 | #include "string-table.h" |
07630cea | 46 | #include "string-util.h" |
4f5dd394 | 47 | #include "strv.h" |
e4de7287 | 48 | #include "tmpfile-util.h" |
98dcb8f4 | 49 | #include "user-record.h" |
b1d4f8e1 | 50 | #include "user-util.h" |
34727273 | 51 | |
34c10968 | 52 | /* The maximum size up to which we process coredumps */ |
59f448cf | 53 | #define PROCESS_SIZE_MAX ((uint64_t) (2LLU*1024LLU*1024LLU*1024LLU)) |
34c10968 | 54 | |
bdfd7b2c | 55 | /* The maximum size up to which we leave the coredump around on disk */ |
34c10968 LP |
56 | #define EXTERNAL_SIZE_MAX PROCESS_SIZE_MAX |
57 | ||
bdfd7b2c | 58 | /* The maximum size up to which we store the coredump in the journal */ |
25cad95c | 59 | #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION |
34c10968 | 60 | #define JOURNAL_SIZE_MAX ((size_t) (767LU*1024LU*1024LU)) |
25cad95c YW |
61 | #else |
62 | /* oss-fuzz limits memory usage. */ | |
63 | #define JOURNAL_SIZE_MAX ((size_t) (10LU*1024LU*1024LU)) | |
64 | #endif | |
f5e04665 | 65 | |
c4aa09b0 | 66 | /* Make sure to not make this larger than the maximum journal entry |
27f931d1 | 67 | * size. See DATA_SIZE_MAX in journal-importer.h. */ |
874bc134 | 68 | assert_cc(JOURNAL_SIZE_MAX <= DATA_SIZE_MAX); |
f5e04665 LP |
69 | |
70 | enum { | |
f46c706b | 71 | /* We use these as array indexes for our process metadata cache. |
ea5cc2a8 | 72 | * |
f46c706b FB |
73 | * The first indices of the cache stores the same metadata as the ones passed by |
74 | * the kernel via argv[], ie the strings array passed by the kernel according to | |
75 | * our pattern defined in /proc/sys/kernel/core_pattern (see man:core(5)). */ | |
76 | ||
77 | META_ARGV_PID, /* %P: as seen in the initial pid namespace */ | |
78 | META_ARGV_UID, /* %u: as seen in the initial user namespace */ | |
79 | META_ARGV_GID, /* %g: as seen in the initial user namespace */ | |
80 | META_ARGV_SIGNAL, /* %s: number of signal causing dump */ | |
64a5384f | 81 | META_ARGV_TIMESTAMP, /* %t: time of dump, expressed as seconds since the Epoch (we expand this to µs granularity) */ |
f46c706b FB |
82 | META_ARGV_RLIMIT, /* %c: core file size soft resource limit */ |
83 | META_ARGV_HOSTNAME, /* %h: hostname */ | |
84 | _META_ARGV_MAX, | |
85 | ||
86 | /* The following indexes are cached for a couple of special fields we use (and | |
87 | * thereby need to be retrieved quickly) for naming coredump files, and attaching | |
88 | * xattrs. Unlike the previous ones they are retrieved from the runtime | |
89 | * environment. */ | |
90 | ||
91 | META_COMM = _META_ARGV_MAX, | |
92 | _META_MANDATORY_MAX, | |
93 | ||
94 | /* The rest are similar to the previous ones except that we won't fail if one of | |
95 | * them is missing. */ | |
96 | ||
97 | META_EXE = _META_MANDATORY_MAX, | |
98 | META_UNIT, | |
99 | _META_MAX | |
f5e04665 LP |
100 | }; |
101 | ||
f46c706b FB |
102 | static const char * const meta_field_names[_META_MAX] = { |
103 | [META_ARGV_PID] = "COREDUMP_PID=", | |
104 | [META_ARGV_UID] = "COREDUMP_UID=", | |
105 | [META_ARGV_GID] = "COREDUMP_GID=", | |
106 | [META_ARGV_SIGNAL] = "COREDUMP_SIGNAL=", | |
107 | [META_ARGV_TIMESTAMP] = "COREDUMP_TIMESTAMP=", | |
108 | [META_ARGV_RLIMIT] = "COREDUMP_RLIMIT=", | |
109 | [META_ARGV_HOSTNAME] = "COREDUMP_HOSTNAME=", | |
110 | [META_COMM] = "COREDUMP_COMM=", | |
111 | [META_EXE] = "COREDUMP_EXE=", | |
112 | [META_UNIT] = "COREDUMP_UNIT=", | |
113 | }; | |
114 | ||
115 | typedef struct Context { | |
116 | const char *meta[_META_MAX]; | |
117 | pid_t pid; | |
118 | bool is_pid1; | |
119 | bool is_journald; | |
120 | } Context; | |
121 | ||
34c10968 LP |
122 | typedef enum CoredumpStorage { |
123 | COREDUMP_STORAGE_NONE, | |
124 | COREDUMP_STORAGE_EXTERNAL, | |
125 | COREDUMP_STORAGE_JOURNAL, | |
34c10968 LP |
126 | _COREDUMP_STORAGE_MAX, |
127 | _COREDUMP_STORAGE_INVALID = -1 | |
128 | } CoredumpStorage; | |
129 | ||
34c10968 LP |
130 | static const char* const coredump_storage_table[_COREDUMP_STORAGE_MAX] = { |
131 | [COREDUMP_STORAGE_NONE] = "none", | |
132 | [COREDUMP_STORAGE_EXTERNAL] = "external", | |
133 | [COREDUMP_STORAGE_JOURNAL] = "journal", | |
34c10968 LP |
134 | }; |
135 | ||
136 | DEFINE_PRIVATE_STRING_TABLE_LOOKUP(coredump_storage, CoredumpStorage); | |
8c9571d0 | 137 | static DEFINE_CONFIG_PARSE_ENUM(config_parse_coredump_storage, coredump_storage, CoredumpStorage, "Failed to parse storage setting"); |
34727273 ZJS |
138 | |
139 | static CoredumpStorage arg_storage = COREDUMP_STORAGE_EXTERNAL; | |
8c9571d0 | 140 | static bool arg_compress = true; |
59f448cf LP |
141 | static uint64_t arg_process_size_max = PROCESS_SIZE_MAX; |
142 | static uint64_t arg_external_size_max = EXTERNAL_SIZE_MAX; | |
6e2b4a69 | 143 | static uint64_t arg_journal_size_max = JOURNAL_SIZE_MAX; |
59f448cf LP |
144 | static uint64_t arg_keep_free = (uint64_t) -1; |
145 | static uint64_t arg_max_use = (uint64_t) -1; | |
34c10968 LP |
146 | |
147 | static int parse_config(void) { | |
34c10968 | 148 | static const ConfigTableItem items[] = { |
8c9571d0 LP |
149 | { "Coredump", "Storage", config_parse_coredump_storage, 0, &arg_storage }, |
150 | { "Coredump", "Compress", config_parse_bool, 0, &arg_compress }, | |
59f448cf LP |
151 | { "Coredump", "ProcessSizeMax", config_parse_iec_uint64, 0, &arg_process_size_max }, |
152 | { "Coredump", "ExternalSizeMax", config_parse_iec_uint64, 0, &arg_external_size_max }, | |
8c9571d0 | 153 | { "Coredump", "JournalSizeMax", config_parse_iec_size, 0, &arg_journal_size_max }, |
59f448cf LP |
154 | { "Coredump", "KeepFree", config_parse_iec_uint64, 0, &arg_keep_free }, |
155 | { "Coredump", "MaxUse", config_parse_iec_uint64, 0, &arg_max_use }, | |
34c10968 LP |
156 | {} |
157 | }; | |
158 | ||
4f9ff96a LP |
159 | return config_parse_many_nulstr( |
160 | PKGSYSCONFDIR "/coredump.conf", | |
161 | CONF_PATHS_NULSTR("systemd/coredump.conf.d"), | |
162 | "Coredump\0", | |
163 | config_item_table_lookup, items, | |
164 | CONFIG_PARSE_WARN, | |
165 | NULL, | |
166 | NULL); | |
34c10968 LP |
167 | } |
168 | ||
a1e92eee | 169 | static uint64_t storage_size_max(void) { |
ee0449fd ZJS |
170 | if (arg_storage == COREDUMP_STORAGE_EXTERNAL) |
171 | return arg_external_size_max; | |
172 | if (arg_storage == COREDUMP_STORAGE_JOURNAL) | |
173 | return arg_journal_size_max; | |
174 | assert(arg_storage == COREDUMP_STORAGE_NONE); | |
175 | return 0; | |
73a99163 ZJS |
176 | } |
177 | ||
34c10968 LP |
178 | static int fix_acl(int fd, uid_t uid) { |
179 | ||
349cc4a5 | 180 | #if HAVE_ACL |
709f6e46 | 181 | int r; |
34c10968 | 182 | |
b59233e6 | 183 | assert(fd >= 0); |
d81be4e7 | 184 | assert(uid_is_valid(uid)); |
b59233e6 | 185 | |
05fd2156 | 186 | if (uid_is_system(uid) || uid_is_dynamic(uid) || uid == UID_NOBODY) |
34c10968 LP |
187 | return 0; |
188 | ||
d81be4e7 | 189 | /* Make sure normal users can read (but not write or delete) their own coredumps */ |
567aeb58 | 190 | r = fd_add_uid_acl_permission(fd, uid, ACL_READ); |
709f6e46 | 191 | if (r < 0) |
567aeb58 | 192 | return log_error_errno(r, "Failed to adjust ACL of the coredump: %m"); |
34c10968 LP |
193 | #endif |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
f46c706b FB |
198 | static int fix_xattr(int fd, const Context *context) { |
199 | ||
200 | static const char * const xattrs[_META_MAX] = { | |
201 | [META_ARGV_PID] = "user.coredump.pid", | |
202 | [META_ARGV_UID] = "user.coredump.uid", | |
203 | [META_ARGV_GID] = "user.coredump.gid", | |
204 | [META_ARGV_SIGNAL] = "user.coredump.signal", | |
205 | [META_ARGV_TIMESTAMP] = "user.coredump.timestamp", | |
206 | [META_ARGV_RLIMIT] = "user.coredump.rlimit", | |
207 | [META_ARGV_HOSTNAME] = "user.coredump.hostname", | |
208 | [META_COMM] = "user.coredump.comm", | |
209 | [META_EXE] = "user.coredump.exe", | |
0cd77f97 LP |
210 | }; |
211 | ||
34c10968 | 212 | int r = 0; |
0cd77f97 | 213 | unsigned i; |
34c10968 | 214 | |
b59233e6 LP |
215 | assert(fd >= 0); |
216 | ||
1eef15b1 | 217 | /* Attach some metadata to coredumps via extended |
34c10968 LP |
218 | * attributes. Just because we can. */ |
219 | ||
f46c706b | 220 | for (i = 0; i < _META_MAX; i++) { |
1eef15b1 ZJS |
221 | int k; |
222 | ||
f46c706b | 223 | if (isempty(context->meta[i]) || !xattrs[i]) |
0cd77f97 | 224 | continue; |
34c10968 | 225 | |
f46c706b | 226 | k = fsetxattr(fd, xattrs[i], context->meta[i], strlen(context->meta[i]), XATTR_CREATE); |
1eef15b1 | 227 | if (k < 0 && r == 0) |
34c10968 | 228 | r = -errno; |
0cd77f97 | 229 | } |
34c10968 LP |
230 | |
231 | return r; | |
232 | } | |
233 | ||
b0b21dce | 234 | #define filename_escape(s) xescape((s), "./ ") |
34c10968 | 235 | |
a1e92eee | 236 | static const char *coredump_tmpfile_name(const char *s) { |
0c773903 EV |
237 | return s ? s : "(unnamed temporary file)"; |
238 | } | |
239 | ||
b59233e6 LP |
240 | static int fix_permissions( |
241 | int fd, | |
242 | const char *filename, | |
243 | const char *target, | |
f46c706b | 244 | const Context *context, |
b59233e6 LP |
245 | uid_t uid) { |
246 | ||
03532f0a LP |
247 | int r; |
248 | ||
b59233e6 | 249 | assert(fd >= 0); |
b59233e6 | 250 | assert(target); |
3c171f0b | 251 | assert(context); |
cfd652ed ZJS |
252 | |
253 | /* Ignore errors on these */ | |
3c171f0b LP |
254 | (void) fchmod(fd, 0640); |
255 | (void) fix_acl(fd, uid); | |
256 | (void) fix_xattr(fd, context); | |
cfd652ed | 257 | |
4a62c710 | 258 | if (fsync(fd) < 0) |
0c773903 | 259 | return log_error_errno(errno, "Failed to sync coredump %s: %m", coredump_tmpfile_name(filename)); |
cfd652ed | 260 | |
8ac2f74f LP |
261 | (void) fsync_directory_of_file(fd); |
262 | ||
03532f0a LP |
263 | r = link_tmpfile(fd, filename, target); |
264 | if (r < 0) | |
265 | return log_error_errno(r, "Failed to move coredump %s into place: %m", target); | |
cfd652ed ZJS |
266 | |
267 | return 0; | |
268 | } | |
269 | ||
59f448cf | 270 | static int maybe_remove_external_coredump(const char *filename, uint64_t size) { |
cfd652ed | 271 | |
b59233e6 | 272 | /* Returns 1 if might remove, 0 if will not remove, < 0 on error. */ |
cfd652ed | 273 | |
fc6cec86 | 274 | if (arg_storage == COREDUMP_STORAGE_EXTERNAL && |
cfd652ed ZJS |
275 | size <= arg_external_size_max) |
276 | return 0; | |
277 | ||
278 | if (!filename) | |
279 | return 1; | |
280 | ||
4a62c710 MS |
281 | if (unlink(filename) < 0 && errno != ENOENT) |
282 | return log_error_errno(errno, "Failed to unlink %s: %m", filename); | |
cfd652ed ZJS |
283 | |
284 | return 1; | |
285 | } | |
286 | ||
f46c706b | 287 | static int make_filename(const Context *context, char **ret) { |
b59233e6 | 288 | _cleanup_free_ char *c = NULL, *u = NULL, *p = NULL, *t = NULL; |
a7f7d1bd | 289 | sd_id128_t boot = {}; |
34c10968 LP |
290 | int r; |
291 | ||
3c171f0b | 292 | assert(context); |
34c10968 | 293 | |
f46c706b | 294 | c = filename_escape(context->meta[META_COMM]); |
34c10968 | 295 | if (!c) |
b59233e6 | 296 | return -ENOMEM; |
34c10968 | 297 | |
f46c706b | 298 | u = filename_escape(context->meta[META_ARGV_UID]); |
0dc5d23c | 299 | if (!u) |
b59233e6 | 300 | return -ENOMEM; |
34c10968 LP |
301 | |
302 | r = sd_id128_get_boot(&boot); | |
b59233e6 | 303 | if (r < 0) |
34c10968 | 304 | return r; |
34c10968 | 305 | |
f46c706b | 306 | p = filename_escape(context->meta[META_ARGV_PID]); |
b59233e6 LP |
307 | if (!p) |
308 | return -ENOMEM; | |
309 | ||
f46c706b | 310 | t = filename_escape(context->meta[META_ARGV_TIMESTAMP]); |
b59233e6 LP |
311 | if (!t) |
312 | return -ENOMEM; | |
313 | ||
314 | if (asprintf(ret, | |
64a5384f | 315 | "/var/lib/systemd/coredump/core.%s.%s." SD_ID128_FORMAT_STR ".%s.%s", |
34c10968 | 316 | c, |
0dc5d23c | 317 | u, |
34c10968 LP |
318 | SD_ID128_FORMAT_VAL(boot), |
319 | p, | |
b59233e6 LP |
320 | t) < 0) |
321 | return -ENOMEM; | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static int save_external_coredump( | |
f46c706b | 327 | const Context *context, |
3c171f0b | 328 | int input_fd, |
b59233e6 | 329 | char **ret_filename, |
5f3e0a74 HW |
330 | int *ret_node_fd, |
331 | int *ret_data_fd, | |
0cd4e913 | 332 | uint64_t *ret_size, |
cc4419ed | 333 | bool *ret_truncated) { |
b59233e6 LP |
334 | |
335 | _cleanup_free_ char *fn = NULL, *tmp = NULL; | |
336 | _cleanup_close_ int fd = -1; | |
ee0449fd | 337 | uint64_t rlimit, process_limit, max_size; |
b59233e6 | 338 | struct stat st; |
3c171f0b | 339 | uid_t uid; |
b59233e6 LP |
340 | int r; |
341 | ||
3c171f0b | 342 | assert(context); |
b59233e6 | 343 | assert(ret_filename); |
5f3e0a74 HW |
344 | assert(ret_node_fd); |
345 | assert(ret_data_fd); | |
b59233e6 LP |
346 | assert(ret_size); |
347 | ||
f46c706b | 348 | r = parse_uid(context->meta[META_ARGV_UID], &uid); |
3c171f0b LP |
349 | if (r < 0) |
350 | return log_error_errno(r, "Failed to parse UID: %m"); | |
351 | ||
f46c706b | 352 | r = safe_atou64(context->meta[META_ARGV_RLIMIT], &rlimit); |
bdfd7b2c | 353 | if (r < 0) |
f46c706b FB |
354 | return log_error_errno(r, "Failed to parse resource limit '%s': %m", |
355 | context->meta[META_ARGV_RLIMIT]); | |
d7a0f1f4 | 356 | if (rlimit < page_size()) |
f46c706b FB |
357 | /* Is coredumping disabled? Then don't bother saving/processing the |
358 | * coredump. Anything below PAGE_SIZE cannot give a readable coredump | |
359 | * (the kernel uses ELF_EXEC_PAGESIZE which is not easily accessible, but | |
360 | * is usually the same as PAGE_SIZE. */ | |
baaa35ad ZJS |
361 | return log_info_errno(SYNTHETIC_ERRNO(EBADSLT), |
362 | "Resource limits disable core dumping for process %s (%s).", | |
f46c706b | 363 | context->meta[META_ARGV_PID], context->meta[META_COMM]); |
bdfd7b2c | 364 | |
ee0449fd | 365 | process_limit = MAX(arg_process_size_max, storage_size_max()); |
baaa35ad ZJS |
366 | if (process_limit == 0) |
367 | return log_debug_errno(SYNTHETIC_ERRNO(EBADSLT), | |
368 | "Limits for coredump processing and storage are both 0, not dumping core."); | |
ee0449fd | 369 | |
bdfd7b2c | 370 | /* Never store more than the process configured, or than we actually shall keep or process */ |
ee0449fd | 371 | max_size = MIN(rlimit, process_limit); |
bdfd7b2c | 372 | |
3c171f0b | 373 | r = make_filename(context, &fn); |
23bbb0de MS |
374 | if (r < 0) |
375 | return log_error_errno(r, "Failed to determine coredump file name: %m"); | |
34c10968 | 376 | |
6e5dcce4 | 377 | (void) mkdir_p_label("/var/lib/systemd/coredump", 0755); |
803a3464 | 378 | |
03532f0a | 379 | fd = open_tmpfile_linkable(fn, O_RDWR|O_CLOEXEC, &tmp); |
4a62c710 | 380 | if (fd < 0) |
03532f0a | 381 | return log_error_errno(fd, "Failed to create temporary file for coredump %s: %m", fn); |
803a3464 | 382 | |
1c876927 | 383 | r = copy_bytes(input_fd, fd, max_size, 0); |
73a99163 | 384 | if (r < 0) { |
f46c706b FB |
385 | log_error_errno(r, "Cannot store coredump of %s (%s): %m", |
386 | context->meta[META_ARGV_PID], context->meta[META_COMM]); | |
93240d3a | 387 | goto fail; |
0cd4e913 | 388 | } |
cc4419ed ZJS |
389 | *ret_truncated = r == 1; |
390 | if (*ret_truncated) | |
73a99163 ZJS |
391 | log_struct(LOG_INFO, |
392 | LOG_MESSAGE("Core file was truncated to %zu bytes.", max_size), | |
393 | "SIZE_LIMIT=%zu", max_size, | |
a1230ff9 | 394 | "MESSAGE_ID=" SD_MESSAGE_TRUNCATED_CORE_STR); |
803a3464 | 395 | |
34c10968 | 396 | if (fstat(fd, &st) < 0) { |
73a99163 | 397 | log_error_errno(errno, "Failed to fstat core file %s: %m", coredump_tmpfile_name(tmp)); |
34c10968 LP |
398 | goto fail; |
399 | } | |
400 | ||
7849c2ac | 401 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) { |
0c773903 | 402 | log_error_errno(errno, "Failed to seek on %s: %m", coredump_tmpfile_name(tmp)); |
b59233e6 | 403 | goto fail; |
7849c2ac TA |
404 | } |
405 | ||
d80b051c | 406 | #if HAVE_COMPRESSION |
cfd652ed | 407 | /* If we will remove the coredump anyway, do not compress. */ |
6e9ef603 | 408 | if (arg_compress && !maybe_remove_external_coredump(NULL, st.st_size)) { |
cfd652ed | 409 | |
b59233e6 LP |
410 | _cleanup_free_ char *fn_compressed = NULL, *tmp_compressed = NULL; |
411 | _cleanup_close_ int fd_compressed = -1; | |
cfd652ed | 412 | |
b910cc72 | 413 | fn_compressed = strjoin(fn, COMPRESSED_EXT); |
b59233e6 | 414 | if (!fn_compressed) { |
d89c8fdf | 415 | log_oom(); |
cfd652ed ZJS |
416 | goto uncompressed; |
417 | } | |
418 | ||
03532f0a LP |
419 | fd_compressed = open_tmpfile_linkable(fn_compressed, O_RDWR|O_CLOEXEC, &tmp_compressed); |
420 | if (fd_compressed < 0) { | |
421 | log_error_errno(fd_compressed, "Failed to create temporary file for coredump %s: %m", fn_compressed); | |
b59233e6 | 422 | goto uncompressed; |
03532f0a | 423 | } |
cfd652ed | 424 | |
d89c8fdf | 425 | r = compress_stream(fd, fd_compressed, -1); |
b59233e6 | 426 | if (r < 0) { |
0c773903 | 427 | log_error_errno(r, "Failed to compress %s: %m", coredump_tmpfile_name(tmp_compressed)); |
b59233e6 LP |
428 | goto fail_compressed; |
429 | } | |
430 | ||
3c171f0b | 431 | r = fix_permissions(fd_compressed, tmp_compressed, fn_compressed, context, uid); |
cfd652ed | 432 | if (r < 0) |
b59233e6 LP |
433 | goto fail_compressed; |
434 | ||
435 | /* OK, this worked, we can get rid of the uncompressed version now */ | |
0c773903 EV |
436 | if (tmp) |
437 | unlink_noerrno(tmp); | |
cfd652ed | 438 | |
1cc6c93a YW |
439 | *ret_filename = TAKE_PTR(fn_compressed); /* compressed */ |
440 | *ret_node_fd = TAKE_FD(fd_compressed); /* compressed */ | |
441 | *ret_data_fd = TAKE_FD(fd); /* uncompressed */ | |
59f448cf | 442 | *ret_size = (uint64_t) st.st_size; /* uncompressed */ |
cfd652ed | 443 | |
cfd652ed ZJS |
444 | return 0; |
445 | ||
b59233e6 | 446 | fail_compressed: |
0c773903 EV |
447 | if (tmp_compressed) |
448 | (void) unlink(tmp_compressed); | |
34c10968 | 449 | } |
cfd652ed ZJS |
450 | |
451 | uncompressed: | |
3b1a55e1 | 452 | #endif |
5f3e0a74 | 453 | |
3c171f0b | 454 | r = fix_permissions(fd, tmp, fn, context, uid); |
cfd652ed ZJS |
455 | if (r < 0) |
456 | goto fail; | |
34c10968 | 457 | |
1cc6c93a YW |
458 | *ret_filename = TAKE_PTR(fn); |
459 | *ret_data_fd = TAKE_FD(fd); | |
5f3e0a74 | 460 | *ret_node_fd = -1; |
59f448cf | 461 | *ret_size = (uint64_t) st.st_size; |
34c10968 | 462 | |
34c10968 LP |
463 | return 0; |
464 | ||
465 | fail: | |
0c773903 EV |
466 | if (tmp) |
467 | (void) unlink(tmp); | |
34c10968 LP |
468 | return r; |
469 | } | |
470 | ||
471 | static int allocate_journal_field(int fd, size_t size, char **ret, size_t *ret_size) { | |
472 | _cleanup_free_ char *field = NULL; | |
473 | ssize_t n; | |
474 | ||
8d4e028f | 475 | assert(fd >= 0); |
34c10968 LP |
476 | assert(ret); |
477 | assert(ret_size); | |
478 | ||
4a62c710 MS |
479 | if (lseek(fd, 0, SEEK_SET) == (off_t) -1) |
480 | return log_warning_errno(errno, "Failed to seek: %m"); | |
803a3464 | 481 | |
34c10968 LP |
482 | field = malloc(9 + size); |
483 | if (!field) { | |
cfd652ed | 484 | log_warning("Failed to allocate memory for coredump, coredump will not be stored."); |
34c10968 LP |
485 | return -ENOMEM; |
486 | } | |
487 | ||
488 | memcpy(field, "COREDUMP=", 9); | |
489 | ||
490 | n = read(fd, field + 9, size); | |
23bbb0de MS |
491 | if (n < 0) |
492 | return log_error_errno((int) n, "Failed to read core data: %m"); | |
baaa35ad ZJS |
493 | if ((size_t) n < size) |
494 | return log_error_errno(SYNTHETIC_ERRNO(EIO), | |
495 | "Core data too short."); | |
34c10968 | 496 | |
1cc6c93a | 497 | *ret = TAKE_PTR(field); |
34c10968 LP |
498 | *ret_size = size + 9; |
499 | ||
34c10968 LP |
500 | return 0; |
501 | } | |
803a3464 | 502 | |
3f132692 JF |
503 | /* Joins /proc/[pid]/fd/ and /proc/[pid]/fdinfo/ into the following lines: |
504 | * 0:/dev/pts/23 | |
505 | * pos: 0 | |
506 | * flags: 0100002 | |
507 | * | |
508 | * 1:/dev/pts/23 | |
509 | * pos: 0 | |
510 | * flags: 0100002 | |
511 | * | |
512 | * 2:/dev/pts/23 | |
513 | * pos: 0 | |
514 | * flags: 0100002 | |
515 | * EOF | |
516 | */ | |
517 | static int compose_open_fds(pid_t pid, char **open_fds) { | |
4d84bc2f LP |
518 | _cleanup_closedir_ DIR *proc_fd_dir = NULL; |
519 | _cleanup_close_ int proc_fdinfo_fd = -1; | |
520 | _cleanup_free_ char *buffer = NULL; | |
3f132692 | 521 | _cleanup_fclose_ FILE *stream = NULL; |
59059b4a | 522 | const char *fddelim = "", *path; |
3f132692 | 523 | struct dirent *dent = NULL; |
4d84bc2f | 524 | size_t size = 0; |
7b26ea6f | 525 | int r; |
3f132692 JF |
526 | |
527 | assert(pid >= 0); | |
528 | assert(open_fds != NULL); | |
529 | ||
59059b4a | 530 | path = procfs_file_alloca(pid, "fd"); |
3f132692 | 531 | proc_fd_dir = opendir(path); |
59059b4a ZJS |
532 | if (!proc_fd_dir) |
533 | return -errno; | |
3f132692 | 534 | |
4d84bc2f | 535 | proc_fdinfo_fd = openat(dirfd(proc_fd_dir), "../fdinfo", O_DIRECTORY|O_NOFOLLOW|O_CLOEXEC|O_PATH); |
59059b4a ZJS |
536 | if (proc_fdinfo_fd < 0) |
537 | return -errno; | |
3f132692 | 538 | |
2fe21124 | 539 | stream = open_memstream_unlocked(&buffer, &size); |
3f132692 JF |
540 | if (!stream) |
541 | return -ENOMEM; | |
542 | ||
4d84bc2f | 543 | FOREACH_DIRENT(dent, proc_fd_dir, return -errno) { |
3f132692 | 544 | _cleanup_fclose_ FILE *fdinfo = NULL; |
4d84bc2f | 545 | _cleanup_free_ char *fdname = NULL; |
b46c3e49 | 546 | _cleanup_close_ int fd = -1; |
3f132692 | 547 | |
59059b4a | 548 | r = readlinkat_malloc(dirfd(proc_fd_dir), dent->d_name, &fdname); |
3f132692 JF |
549 | if (r < 0) |
550 | return r; | |
551 | ||
552 | fprintf(stream, "%s%s:%s\n", fddelim, dent->d_name, fdname); | |
553 | fddelim = "\n"; | |
554 | ||
555 | /* Use the directory entry from /proc/[pid]/fd with /proc/[pid]/fdinfo */ | |
59059b4a ZJS |
556 | fd = openat(proc_fdinfo_fd, dent->d_name, O_NOFOLLOW|O_CLOEXEC|O_RDONLY); |
557 | if (fd < 0) | |
3f132692 JF |
558 | continue; |
559 | ||
b46c3e49 VC |
560 | fdinfo = take_fdopen(&fd, "r"); |
561 | if (!fdinfo) | |
3f132692 JF |
562 | continue; |
563 | ||
7b26ea6f LP |
564 | for (;;) { |
565 | _cleanup_free_ char *line = NULL; | |
566 | ||
567 | r = read_line(fdinfo, LONG_LINE_MAX, &line); | |
568 | if (r < 0) | |
569 | return r; | |
570 | if (r == 0) | |
571 | break; | |
572 | ||
0d536673 | 573 | fputs(line, stream); |
7b26ea6f | 574 | fputc('\n', stream); |
4d84bc2f | 575 | } |
3f132692 JF |
576 | } |
577 | ||
4d84bc2f | 578 | errno = 0; |
74ca738f | 579 | stream = safe_fclose(stream); |
4d84bc2f | 580 | |
b3267152 | 581 | if (errno > 0) |
4d84bc2f LP |
582 | return -errno; |
583 | ||
ae2a15bc | 584 | *open_fds = TAKE_PTR(buffer); |
4d84bc2f | 585 | |
3f132692 JF |
586 | return 0; |
587 | } | |
588 | ||
7ed03ce6 JF |
589 | static int get_process_ns(pid_t pid, const char *namespace, ino_t *ns) { |
590 | const char *p; | |
591 | struct stat stbuf; | |
592 | _cleanup_close_ int proc_ns_dir_fd; | |
593 | ||
594 | p = procfs_file_alloca(pid, "ns"); | |
595 | ||
596 | proc_ns_dir_fd = open(p, O_DIRECTORY | O_CLOEXEC | O_RDONLY); | |
597 | if (proc_ns_dir_fd < 0) | |
598 | return -errno; | |
599 | ||
600 | if (fstatat(proc_ns_dir_fd, namespace, &stbuf, /* flags */0) < 0) | |
601 | return -errno; | |
602 | ||
603 | *ns = stbuf.st_ino; | |
604 | return 0; | |
605 | } | |
606 | ||
607 | static int get_mount_namespace_leader(pid_t pid, pid_t *container_pid) { | |
608 | pid_t cpid = pid, ppid = 0; | |
609 | ino_t proc_mntns; | |
c53aafb7 | 610 | int r; |
7ed03ce6 JF |
611 | |
612 | r = get_process_ns(pid, "mnt", &proc_mntns); | |
613 | if (r < 0) | |
614 | return r; | |
615 | ||
aa7530d6 | 616 | for (;;) { |
7ed03ce6 JF |
617 | ino_t parent_mntns; |
618 | ||
619 | r = get_process_ppid(cpid, &ppid); | |
620 | if (r < 0) | |
621 | return r; | |
622 | ||
623 | r = get_process_ns(ppid, "mnt", &parent_mntns); | |
624 | if (r < 0) | |
625 | return r; | |
626 | ||
627 | if (proc_mntns != parent_mntns) | |
628 | break; | |
629 | ||
630 | if (ppid == 1) | |
631 | return -ENOENT; | |
632 | ||
633 | cpid = ppid; | |
634 | } | |
635 | ||
636 | *container_pid = ppid; | |
637 | return 0; | |
638 | } | |
639 | ||
640 | /* Returns 1 if the parent was found. | |
641 | * Returns 0 if there is not a process we can call the pid's | |
642 | * container parent (the pid's process isn't 'containerized'). | |
643 | * Returns a negative number on errors. | |
644 | */ | |
645 | static int get_process_container_parent_cmdline(pid_t pid, char** cmdline) { | |
646 | int r = 0; | |
647 | pid_t container_pid; | |
648 | const char *proc_root_path; | |
649 | struct stat root_stat, proc_root_stat; | |
650 | ||
651 | /* To compare inodes of / and /proc/[pid]/root */ | |
652 | if (stat("/", &root_stat) < 0) | |
653 | return -errno; | |
654 | ||
655 | proc_root_path = procfs_file_alloca(pid, "root"); | |
656 | if (stat(proc_root_path, &proc_root_stat) < 0) | |
657 | return -errno; | |
658 | ||
659 | /* The process uses system root. */ | |
660 | if (proc_root_stat.st_ino == root_stat.st_ino) { | |
661 | *cmdline = NULL; | |
662 | return 0; | |
663 | } | |
664 | ||
665 | r = get_mount_namespace_leader(pid, &container_pid); | |
666 | if (r < 0) | |
667 | return r; | |
668 | ||
09c1dcee | 669 | r = get_process_cmdline(container_pid, SIZE_MAX, 0, cmdline); |
d3cba4ea EV |
670 | if (r < 0) |
671 | return r; | |
672 | ||
673 | return 1; | |
7ed03ce6 JF |
674 | } |
675 | ||
f46c706b | 676 | static int change_uid_gid(const Context *context) { |
3c171f0b LP |
677 | uid_t uid; |
678 | gid_t gid; | |
679 | int r; | |
34c10968 | 680 | |
f46c706b | 681 | r = parse_uid(context->meta[META_ARGV_UID], &uid); |
3c171f0b LP |
682 | if (r < 0) |
683 | return r; | |
8c8549db | 684 | |
28add648 | 685 | if (uid_is_system(uid)) { |
888e378d LP |
686 | const char *user = "systemd-coredump"; |
687 | ||
fafff8f1 | 688 | r = get_user_creds(&user, &uid, &gid, NULL, NULL, 0); |
888e378d LP |
689 | if (r < 0) { |
690 | log_warning_errno(r, "Cannot resolve %s user. Proceeding to dump core as root: %m", user); | |
691 | uid = gid = 0; | |
692 | } | |
693 | } else { | |
f46c706b | 694 | r = parse_gid(context->meta[META_ARGV_GID], &gid); |
888e378d LP |
695 | if (r < 0) |
696 | return r; | |
697 | } | |
3c171f0b LP |
698 | |
699 | return drop_privileges(uid, gid, 0); | |
700 | } | |
8c8549db | 701 | |
3c171f0b | 702 | static int submit_coredump( |
f46c706b | 703 | Context *context, |
9a435388 | 704 | struct iovec_wrapper *iovw, |
3c171f0b | 705 | int input_fd) { |
34c10968 | 706 | |
5f3e0a74 | 707 | _cleanup_close_ int coredump_fd = -1, coredump_node_fd = -1; |
9a435388 | 708 | _cleanup_free_ char *filename = NULL, *coredump_data = NULL; |
51d3783d | 709 | _cleanup_free_ char *stacktrace = NULL; |
9a435388 | 710 | char *core_message; |
a5ca3649 | 711 | uint64_t coredump_size = UINT64_MAX; |
f46c706b | 712 | bool truncated = false; |
3c171f0b | 713 | int r; |
f5e04665 | 714 | |
3c171f0b | 715 | assert(context); |
9a435388 | 716 | assert(iovw); |
3c171f0b | 717 | assert(input_fd >= 0); |
f5e04665 | 718 | |
3c171f0b LP |
719 | /* Vacuum before we write anything again */ |
720 | (void) coredump_vacuum(-1, arg_keep_free, arg_max_use); | |
803a3464 | 721 | |
3c171f0b | 722 | /* Always stream the coredump to disk, if that's possible */ |
0cd4e913 ZJS |
723 | r = save_external_coredump(context, input_fd, |
724 | &filename, &coredump_node_fd, &coredump_fd, &coredump_size, &truncated); | |
3c171f0b LP |
725 | if (r < 0) |
726 | /* Skip whole core dumping part */ | |
727 | goto log; | |
728 | ||
51d3783d FB |
729 | /* If we don't want to keep the coredump on disk, remove it now, as later on we |
730 | * will lack the privileges for it. However, we keep the fd to it, so that we can | |
731 | * still process it and log it. */ | |
3c171f0b LP |
732 | r = maybe_remove_external_coredump(filename, coredump_size); |
733 | if (r < 0) | |
734 | return r; | |
735 | if (r == 0) { | |
2a3bebd0 | 736 | (void) iovw_put_string_field(iovw, "COREDUMP_FILENAME=", filename); |
3c171f0b | 737 | |
6e9ef603 | 738 | } else if (arg_storage == COREDUMP_STORAGE_EXTERNAL) |
5206a724 | 739 | log_info("The core will not be stored: size %"PRIu64" is greater than %"PRIu64" (the configured maximum)", |
6e9ef603 | 740 | coredump_size, arg_external_size_max); |
f5e04665 | 741 | |
3c171f0b LP |
742 | /* Vacuum again, but exclude the coredump we just created */ |
743 | (void) coredump_vacuum(coredump_node_fd >= 0 ? coredump_node_fd : coredump_fd, arg_keep_free, arg_max_use); | |
8c9571d0 | 744 | |
51d3783d FB |
745 | /* Now, let's drop privileges to become the user who owns the segfaulted process |
746 | * and allocate the coredump memory under the user's uid. This also ensures that | |
747 | * the credentials journald will see are the ones of the coredumping user, thus | |
748 | * making sure the user gets access to the core dump. Let's also get rid of all | |
3c171f0b LP |
749 | * capabilities, if we run as root, we won't need them anymore. */ |
750 | r = change_uid_gid(context); | |
751 | if (r < 0) | |
752 | return log_error_errno(r, "Failed to drop privileges: %m"); | |
34c10968 | 753 | |
349cc4a5 | 754 | #if HAVE_ELFUTILS |
5238e957 | 755 | /* Try to get a stack trace if we can */ |
51d3783d FB |
756 | if (coredump_size > arg_process_size_max) { |
757 | log_debug("Not generating stack trace: core size %"PRIu64" is greater " | |
758 | "than %"PRIu64" (the configured maximum)", | |
6e9ef603 | 759 | coredump_size, arg_process_size_max); |
51d3783d | 760 | } else |
f46c706b | 761 | coredump_make_stack_trace(coredump_fd, context->meta[META_EXE], &stacktrace); |
3c171f0b | 762 | #endif |
51d3783d | 763 | |
3c171f0b | 764 | log: |
f46c706b FB |
765 | core_message = strjoina("Process ", context->meta[META_ARGV_PID], |
766 | " (", context->meta[META_COMM], ") of user ", | |
767 | context->meta[META_ARGV_UID], " dumped core.", | |
768 | context->is_journald && filename ? "\nCoredump diverted to " : NULL, | |
769 | context->is_journald && filename ? filename : NULL); | |
51d3783d | 770 | |
9a435388 | 771 | core_message = strjoina(core_message, stacktrace ? "\n\n" : NULL, stacktrace); |
92e92d71 | 772 | |
f46c706b | 773 | if (context->is_journald) { |
4f62556d | 774 | /* We cannot log to the journal, so just print the message. |
92e92d71 | 775 | * The target was set previously to something safe. */ |
9a435388 | 776 | log_dispatch(LOG_ERR, 0, core_message); |
92e92d71 ZJS |
777 | return 0; |
778 | } | |
779 | ||
2a3bebd0 | 780 | (void) iovw_put_string_field(iovw, "MESSAGE=", core_message); |
3c171f0b | 781 | |
0cd4e913 | 782 | if (truncated) |
2a3bebd0 | 783 | (void) iovw_put_string_field(iovw, "COREDUMP_TRUNCATED=", "1"); |
0cd4e913 | 784 | |
3c171f0b | 785 | /* Optionally store the entire coredump in the journal */ |
6e9ef603 ZJS |
786 | if (arg_storage == COREDUMP_STORAGE_JOURNAL) { |
787 | if (coredump_size <= arg_journal_size_max) { | |
788 | size_t sz = 0; | |
789 | ||
790 | /* Store the coredump itself in the journal */ | |
791 | ||
792 | r = allocate_journal_field(coredump_fd, (size_t) coredump_size, &coredump_data, &sz); | |
9a435388 FB |
793 | if (r >= 0) { |
794 | if (iovw_put(iovw, coredump_data, sz) >= 0) | |
795 | TAKE_PTR(coredump_data); | |
796 | } else | |
6e9ef603 ZJS |
797 | log_warning_errno(r, "Failed to attach the core to the journal entry: %m"); |
798 | } else | |
5206a724 | 799 | log_info("The core will not be stored: size %"PRIu64" is greater than %"PRIu64" (the configured maximum)", |
6e9ef603 | 800 | coredump_size, arg_journal_size_max); |
f5e04665 LP |
801 | } |
802 | ||
9a435388 | 803 | r = sd_journal_sendv(iovw->iovec, iovw->count); |
3c171f0b LP |
804 | if (r < 0) |
805 | return log_error_errno(r, "Failed to log coredump: %m"); | |
806 | ||
807 | return 0; | |
808 | } | |
809 | ||
f46c706b FB |
810 | static int save_context(Context *context, const struct iovec_wrapper *iovw) { |
811 | unsigned n, i, count = 0; | |
812 | const char *unit; | |
813 | int r; | |
3c171f0b | 814 | |
3c171f0b | 815 | assert(context); |
f46c706b FB |
816 | assert(iovw); |
817 | assert(iovw->count >= _META_ARGV_MAX); | |
3c171f0b | 818 | |
f46c706b | 819 | /* The context does not allocate any memory on its own */ |
3c171f0b | 820 | |
f46c706b FB |
821 | for (n = 0; n < iovw->count; n++) { |
822 | struct iovec *iovec = iovw->iovec + n; | |
92e92d71 | 823 | |
f46c706b FB |
824 | for (i = 0; i < ELEMENTSOF(meta_field_names); i++) { |
825 | char *p; | |
826 | ||
827 | /* Note that these strings are NUL terminated, because we made sure that a | |
828 | * trailing NUL byte is in the buffer, though not included in the iov_len | |
829 | * count (see process_socket() and gather_pid_metadata_*()) */ | |
830 | assert(((char*) iovec->iov_base)[iovec->iov_len] == 0); | |
3c171f0b | 831 | |
f46c706b FB |
832 | p = startswith(iovec->iov_base, meta_field_names[i]); |
833 | if (p) { | |
834 | context->meta[i] = p; | |
835 | count++; | |
836 | break; | |
837 | } | |
838 | } | |
3c171f0b | 839 | } |
f46c706b FB |
840 | |
841 | if (!context->meta[META_ARGV_PID]) | |
842 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
843 | "Failed to find the PID of crashing process"); | |
844 | ||
845 | r = parse_pid(context->meta[META_ARGV_PID], &context->pid); | |
846 | if (r < 0) | |
847 | return log_error_errno(r, "Failed to parse PID \"%s\": %m", context->meta[META_ARGV_PID]); | |
848 | ||
849 | unit = context->meta[META_UNIT]; | |
850 | context->is_pid1 = streq(context->meta[META_ARGV_PID], "1") || streq_ptr(unit, SPECIAL_INIT_SCOPE); | |
851 | context->is_journald = streq_ptr(unit, SPECIAL_JOURNALD_SERVICE); | |
852 | ||
853 | return 0; | |
3c171f0b LP |
854 | } |
855 | ||
856 | static int process_socket(int fd) { | |
f8540bde | 857 | _cleanup_close_ int input_fd = -1; |
f46c706b | 858 | Context context = {}; |
9a435388 FB |
859 | struct iovec_wrapper iovw = {}; |
860 | struct iovec iovec; | |
f46c706b | 861 | int i, r; |
3c171f0b LP |
862 | |
863 | assert(fd >= 0); | |
864 | ||
6bf3c61c | 865 | log_setup_service(); |
3c171f0b | 866 | |
988e89ee ZJS |
867 | log_debug("Processing coredump received on stdin..."); |
868 | ||
3c171f0b | 869 | for (;;) { |
fb29cdbe | 870 | CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(int))) control; |
3c171f0b LP |
871 | struct msghdr mh = { |
872 | .msg_control = &control, | |
873 | .msg_controllen = sizeof(control), | |
874 | .msg_iovlen = 1, | |
875 | }; | |
876 | ssize_t n; | |
fe1ef0f8 | 877 | ssize_t l; |
3c171f0b | 878 | |
fe1ef0f8 EV |
879 | l = next_datagram_size_fd(fd); |
880 | if (l < 0) { | |
881 | r = log_error_errno(l, "Failed to determine datagram size to read: %m"); | |
3c171f0b LP |
882 | goto finish; |
883 | } | |
884 | ||
9a435388 FB |
885 | iovec.iov_len = l; |
886 | iovec.iov_base = malloc(l + 1); | |
887 | if (!iovec.iov_base) { | |
3c171f0b LP |
888 | r = log_oom(); |
889 | goto finish; | |
890 | } | |
891 | ||
9a435388 | 892 | mh.msg_iov = &iovec; |
3c171f0b | 893 | |
3691bcf3 | 894 | n = recvmsg_safe(fd, &mh, MSG_CMSG_CLOEXEC); |
3c171f0b | 895 | if (n < 0) { |
9a435388 | 896 | free(iovec.iov_base); |
3691bcf3 | 897 | r = log_error_errno(n, "Failed to receive datagram: %m"); |
3c171f0b LP |
898 | goto finish; |
899 | } | |
900 | ||
9a435388 FB |
901 | /* The final zero-length datagram carries the file descriptor and tells us |
902 | * that we're done. */ | |
3c171f0b | 903 | if (n == 0) { |
dac556fa | 904 | struct cmsghdr *found; |
3c171f0b | 905 | |
9a435388 | 906 | free(iovec.iov_base); |
3c171f0b | 907 | |
dac556fa | 908 | found = cmsg_find(&mh, SOL_SOCKET, SCM_RIGHTS, CMSG_LEN(sizeof(int))); |
3c171f0b | 909 | if (!found) { |
3691bcf3 LP |
910 | cmsg_close_all(&mh); |
911 | r = log_error_errno(SYNTHETIC_ERRNO(EBADMSG), | |
912 | "Coredump file descriptor missing."); | |
3c171f0b LP |
913 | goto finish; |
914 | } | |
915 | ||
f8540bde FB |
916 | assert(input_fd < 0); |
917 | input_fd = *(int*) CMSG_DATA(found); | |
3c171f0b | 918 | break; |
3691bcf3 LP |
919 | } else |
920 | cmsg_close_all(&mh); | |
3c171f0b LP |
921 | |
922 | /* Add trailing NUL byte, in case these are strings */ | |
9a435388 FB |
923 | ((char*) iovec.iov_base)[n] = 0; |
924 | iovec.iov_len = (size_t) n; | |
3c171f0b | 925 | |
9a435388 FB |
926 | r = iovw_put(&iovw, iovec.iov_base, iovec.iov_len); |
927 | if (r < 0) | |
928 | goto finish; | |
34c10968 LP |
929 | } |
930 | ||
61233823 | 931 | /* Make sure we got all data we really need */ |
f8540bde | 932 | assert(input_fd >= 0); |
3c171f0b | 933 | |
f46c706b FB |
934 | r = save_context(&context, &iovw); |
935 | if (r < 0) | |
936 | goto finish; | |
937 | ||
938 | /* Make sure we received at least all fields we need. */ | |
939 | for (i = 0; i < _META_MANDATORY_MAX; i++) | |
940 | if (!context.meta[i]) { | |
941 | r = log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
942 | "A mandatory argument (%i) has not been sent, aborting.", | |
943 | i); | |
944 | goto finish; | |
945 | } | |
80002f66 | 946 | |
f46c706b | 947 | r = submit_coredump(&context, &iovw, input_fd); |
3c171f0b LP |
948 | |
949 | finish: | |
9a435388 | 950 | iovw_free_contents(&iovw, true); |
3c171f0b LP |
951 | return r; |
952 | } | |
953 | ||
9a435388 | 954 | static int send_iovec(const struct iovec_wrapper *iovw, int input_fd) { |
3c171f0b LP |
955 | |
956 | static const union sockaddr_union sa = { | |
957 | .un.sun_family = AF_UNIX, | |
958 | .un.sun_path = "/run/systemd/coredump", | |
959 | }; | |
960 | _cleanup_close_ int fd = -1; | |
961 | size_t i; | |
962 | int r; | |
963 | ||
9a435388 | 964 | assert(iovw); |
3c171f0b LP |
965 | assert(input_fd >= 0); |
966 | ||
967 | fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_CLOEXEC, 0); | |
968 | if (fd < 0) | |
969 | return log_error_errno(errno, "Failed to create coredump socket: %m"); | |
970 | ||
fc2fffe7 | 971 | if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) |
3c171f0b LP |
972 | return log_error_errno(errno, "Failed to connect to coredump service: %m"); |
973 | ||
9a435388 | 974 | for (i = 0; i < iovw->count; i++) { |
fec603eb | 975 | struct msghdr mh = { |
9a435388 | 976 | .msg_iov = iovw->iovec + i, |
fec603eb LP |
977 | .msg_iovlen = 1, |
978 | }; | |
979 | struct iovec copy[2]; | |
980 | ||
981 | for (;;) { | |
982 | if (sendmsg(fd, &mh, MSG_NOSIGNAL) >= 0) | |
983 | break; | |
984 | ||
985 | if (errno == EMSGSIZE && mh.msg_iov[0].iov_len > 0) { | |
f46c706b FB |
986 | /* This field didn't fit? That's a pity. Given that this is |
987 | * just metadata, let's truncate the field at half, and try | |
988 | * again. We append three dots, in order to show that this is | |
989 | * truncated. */ | |
fec603eb LP |
990 | |
991 | if (mh.msg_iov != copy) { | |
f46c706b FB |
992 | /* We don't want to modify the caller's iovec, hence |
993 | * let's create our own array, consisting of two new | |
994 | * iovecs, where the first is a (truncated) copy of | |
995 | * what we want to send, and the second one contains | |
996 | * the trailing dots. */ | |
9a435388 | 997 | copy[0] = iovw->iovec[i]; |
ed0cb346 | 998 | copy[1] = IOVEC_MAKE(((char[]){'.', '.', '.'}), 3); |
fec603eb LP |
999 | |
1000 | mh.msg_iov = copy; | |
1001 | mh.msg_iovlen = 2; | |
1002 | } | |
1003 | ||
1004 | copy[0].iov_len /= 2; /* halve it, and try again */ | |
1005 | continue; | |
1006 | } | |
3c171f0b | 1007 | |
3c171f0b | 1008 | return log_error_errno(errno, "Failed to send coredump datagram: %m"); |
fec603eb | 1009 | } |
1eef15b1 ZJS |
1010 | } |
1011 | ||
3c171f0b LP |
1012 | r = send_one_fd(fd, input_fd, 0); |
1013 | if (r < 0) | |
1014 | return log_error_errno(r, "Failed to send coredump fd: %m"); | |
1eef15b1 | 1015 | |
3c171f0b LP |
1016 | return 0; |
1017 | } | |
1eef15b1 | 1018 | |
64a5384f LP |
1019 | static int gather_pid_metadata_from_argv( |
1020 | struct iovec_wrapper *iovw, | |
1021 | Context *context, | |
1022 | int argc, char **argv) { | |
1023 | ||
f46c706b FB |
1024 | _cleanup_free_ char *free_timestamp = NULL; |
1025 | int i, r, signo; | |
3c171f0b | 1026 | char *t; |
3c171f0b | 1027 | |
f46c706b FB |
1028 | /* We gather all metadata that were passed via argv[] into an array of iovecs that |
1029 | * we'll forward to the socket unit */ | |
3c171f0b | 1030 | |
f46c706b FB |
1031 | if (argc < _META_ARGV_MAX) |
1032 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), | |
1033 | "Not enough arguments passed by the kernel (%i, expected %i).", | |
1034 | argc, _META_ARGV_MAX); | |
3c171f0b | 1035 | |
f46c706b | 1036 | for (i = 0; i < _META_ARGV_MAX; i++) { |
3c171f0b | 1037 | |
f46c706b | 1038 | t = argv[i]; |
3c171f0b | 1039 | |
f46c706b | 1040 | switch (i) { |
64a5384f | 1041 | |
f46c706b FB |
1042 | case META_ARGV_TIMESTAMP: |
1043 | /* The journal fields contain the timestamp padded with six | |
1044 | * zeroes, so that the kernel-supplied 1s granularity timestamps | |
1045 | * becomes 1µs granularity, i.e. the granularity systemd usually | |
1046 | * operates in. */ | |
1047 | t = free_timestamp = strjoin(argv[i], "000000"); | |
1048 | if (!t) | |
1049 | return log_oom(); | |
1050 | break; | |
64a5384f | 1051 | |
f46c706b FB |
1052 | case META_ARGV_SIGNAL: |
1053 | /* For signal, record its pretty name too */ | |
1054 | if (safe_atoi(argv[i], &signo) >= 0 && SIGNAL_VALID(signo)) | |
2a3bebd0 FB |
1055 | (void) iovw_put_string_field(iovw, "COREDUMP_SIGNAL_NAME=SIG", |
1056 | signal_to_string(signo)); | |
f46c706b | 1057 | break; |
64a5384f | 1058 | |
f46c706b FB |
1059 | default: |
1060 | break; | |
c8091d92 LP |
1061 | } |
1062 | ||
f46c706b FB |
1063 | r = iovw_put_string_field(iovw, meta_field_names[i], t); |
1064 | if (r < 0) | |
1065 | return r; | |
8c8549db | 1066 | } |
803a3464 | 1067 | |
f46c706b FB |
1068 | /* Cache some of the process metadata we collected so far and that we'll need to |
1069 | * access soon */ | |
1070 | return save_context(context, iovw); | |
1071 | } | |
3c171f0b | 1072 | |
f46c706b FB |
1073 | static int gather_pid_metadata(struct iovec_wrapper *iovw, Context *context) { |
1074 | uid_t owner_uid; | |
1075 | pid_t pid; | |
1076 | char *t; | |
1077 | const char *p; | |
1078 | int r; | |
f5e04665 | 1079 | |
f46c706b FB |
1080 | /* Note that if we fail on oom later on, we do not roll-back changes to the iovec |
1081 | * structure. (It remains valid, with the first iovec fields initialized.) */ | |
f5e04665 | 1082 | |
f46c706b | 1083 | pid = context->pid; |
f5e04665 | 1084 | |
f46c706b FB |
1085 | /* The following is mandatory */ |
1086 | r = get_process_comm(pid, &t); | |
9a435388 | 1087 | if (r < 0) |
f46c706b | 1088 | return log_error_errno(r, "Failed to get COMM: %m"); |
f5e04665 | 1089 | |
f46c706b | 1090 | r = iovw_put_string_field_free(iovw, "COREDUMP_COMM=", t); |
9a435388 FB |
1091 | if (r < 0) |
1092 | return r; | |
f45b8015 | 1093 | |
f46c706b | 1094 | /* The following are optional but we used them if present */ |
2a3bebd0 FB |
1095 | r = get_process_exe(pid, &t); |
1096 | if (r >= 0) | |
1097 | r = iovw_put_string_field_free(iovw, "COREDUMP_EXE=", t); | |
1098 | if (r < 0) | |
f46c706b | 1099 | log_warning_errno(r, "Failed to get EXE, ignoring: %m"); |
bdfd7b2c | 1100 | |
f46c706b | 1101 | if (cg_pid_get_unit(pid, &t) >= 0) |
2a3bebd0 | 1102 | (void) iovw_put_string_field_free(iovw, "COREDUMP_UNIT=", t); |
f5e04665 | 1103 | |
9a435388 | 1104 | /* The next are optional */ |
f46c706b | 1105 | if (cg_pid_get_user_unit(pid, &t) >= 0) |
2a3bebd0 | 1106 | (void) iovw_put_string_field_free(iovw, "COREDUMP_USER_UNIT=", t); |
f46c706b | 1107 | |
9aa82023 | 1108 | if (sd_pid_get_session(pid, &t) >= 0) |
9a435388 | 1109 | (void) iovw_put_string_field_free(iovw, "COREDUMP_SESSION=", t); |
f5e04665 | 1110 | |
a035f819 | 1111 | if (sd_pid_get_owner_uid(pid, &owner_uid) >= 0) { |
9a435388 | 1112 | r = asprintf(&t, UID_FMT, owner_uid); |
7de80bfe | 1113 | if (r > 0) |
9a435388 | 1114 | (void) iovw_put_string_field_free(iovw, "COREDUMP_OWNER_UID=", t); |
f5e04665 LP |
1115 | } |
1116 | ||
9aa82023 | 1117 | if (sd_pid_get_slice(pid, &t) >= 0) |
2a3bebd0 | 1118 | (void) iovw_put_string_field_free(iovw, "COREDUMP_SLICE=", t); |
f5e04665 | 1119 | |
09c1dcee | 1120 | if (get_process_cmdline(pid, SIZE_MAX, 0, &t) >= 0) |
2a3bebd0 | 1121 | (void) iovw_put_string_field_free(iovw, "COREDUMP_CMDLINE=", t); |
a035f819 | 1122 | |
9aa82023 | 1123 | if (cg_pid_get_path_shifted(pid, NULL, &t) >= 0) |
2a3bebd0 | 1124 | (void) iovw_put_string_field_free(iovw, "COREDUMP_CGROUP=", t); |
a035f819 | 1125 | |
9aa82023 | 1126 | if (compose_open_fds(pid, &t) >= 0) |
2a3bebd0 | 1127 | (void) iovw_put_string_field_free(iovw, "COREDUMP_OPEN_FDS=", t); |
3f132692 JF |
1128 | |
1129 | p = procfs_file_alloca(pid, "status"); | |
9aa82023 | 1130 | if (read_full_file(p, &t, NULL) >= 0) |
2a3bebd0 | 1131 | (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_STATUS=", t); |
3f132692 JF |
1132 | |
1133 | p = procfs_file_alloca(pid, "maps"); | |
9aa82023 | 1134 | if (read_full_file(p, &t, NULL) >= 0) |
2a3bebd0 | 1135 | (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_MAPS=", t); |
3f132692 JF |
1136 | |
1137 | p = procfs_file_alloca(pid, "limits"); | |
9aa82023 | 1138 | if (read_full_file(p, &t, NULL) >= 0) |
2a3bebd0 | 1139 | (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_LIMITS=", t); |
3f132692 JF |
1140 | |
1141 | p = procfs_file_alloca(pid, "cgroup"); | |
9aa82023 | 1142 | if (read_full_file(p, &t, NULL) >=0) |
2a3bebd0 | 1143 | (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_CGROUP=", t); |
3f132692 | 1144 | |
d7032b1f | 1145 | p = procfs_file_alloca(pid, "mountinfo"); |
9aa82023 | 1146 | if (read_full_file(p, &t, NULL) >=0) |
2a3bebd0 | 1147 | (void) iovw_put_string_field_free(iovw, "COREDUMP_PROC_MOUNTINFO=", t); |
d7032b1f | 1148 | |
9aa82023 | 1149 | if (get_process_cwd(pid, &t) >= 0) |
2a3bebd0 | 1150 | (void) iovw_put_string_field_free(iovw, "COREDUMP_CWD=", t); |
3f132692 JF |
1151 | |
1152 | if (get_process_root(pid, &t) >= 0) { | |
9aa82023 ZJS |
1153 | bool proc_self_root_is_slash; |
1154 | ||
1155 | proc_self_root_is_slash = strcmp(t, "/") == 0; | |
3f132692 | 1156 | |
2a3bebd0 | 1157 | (void) iovw_put_string_field_free(iovw, "COREDUMP_ROOT=", t); |
7ed03ce6 JF |
1158 | |
1159 | /* If the process' root is "/", then there is a chance it has | |
1160 | * mounted own root and hence being containerized. */ | |
9aa82023 | 1161 | if (proc_self_root_is_slash && get_process_container_parent_cmdline(pid, &t) > 0) |
2a3bebd0 | 1162 | (void) iovw_put_string_field_free(iovw, "COREDUMP_CONTAINER_CMDLINE=", t); |
3f132692 JF |
1163 | } |
1164 | ||
9aa82023 | 1165 | if (get_process_environ(pid, &t) >= 0) |
2a3bebd0 | 1166 | (void) iovw_put_string_field_free(iovw, "COREDUMP_ENVIRON=", t); |
9aa82023 | 1167 | |
f46c706b FB |
1168 | /* we successfully acquired all metadata */ |
1169 | return save_context(context, iovw); | |
9aa82023 | 1170 | } |
3f132692 | 1171 | |
9aa82023 | 1172 | static int process_kernel(int argc, char* argv[]) { |
f46c706b | 1173 | Context context = {}; |
9a435388 | 1174 | struct iovec_wrapper *iovw; |
9aa82023 ZJS |
1175 | int r; |
1176 | ||
988e89ee ZJS |
1177 | log_debug("Processing coredump received from the kernel..."); |
1178 | ||
9a435388 FB |
1179 | iovw = iovw_new(); |
1180 | if (!iovw) | |
1181 | return log_oom(); | |
1182 | ||
2a3bebd0 FB |
1183 | (void) iovw_put_string_field(iovw, "MESSAGE_ID=", SD_MESSAGE_COREDUMP_STR); |
1184 | (void) iovw_put_string_field(iovw, "PRIORITY=", STRINGIFY(LOG_CRIT)); | |
f46c706b FB |
1185 | |
1186 | /* Collect all process metadata passed by the kernel through argv[] */ | |
1187 | r = gather_pid_metadata_from_argv(iovw, &context, argc - 1, argv + 1); | |
92e92d71 | 1188 | if (r < 0) |
86562420 | 1189 | goto finish; |
86562420 | 1190 | |
f46c706b FB |
1191 | /* Collect the rest of the process metadata retrieved from the runtime */ |
1192 | r = gather_pid_metadata(iovw, &context); | |
1193 | if (r < 0) | |
1194 | goto finish; | |
1195 | ||
1196 | if (!context.is_journald) { | |
1197 | /* OK, now we know it's not the journal, hence we can make use of it now. */ | |
1198 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); | |
1199 | log_open(); | |
1200 | } | |
1201 | ||
1202 | /* If this is PID 1 disable coredump collection, we'll unlikely be able to process | |
1203 | * it later on. | |
1204 | * | |
1205 | * FIXME: maybe we should disable coredumps generation from the beginning and | |
1206 | * re-enable it only when we know it's either safe (ie we're not running OOM) or | |
1207 | * it's not pid1 ? */ | |
1208 | if (context.is_pid1) { | |
1209 | log_notice("Due to PID 1 having crashed coredump collection will now be turned off."); | |
1210 | disable_coredumps(); | |
1211 | } | |
34c10968 | 1212 | |
f46c706b FB |
1213 | if (context.is_journald || context.is_pid1) |
1214 | r = submit_coredump(&context, iovw, STDIN_FILENO); | |
92e92d71 | 1215 | else |
9a435388 | 1216 | r = send_iovec(iovw, STDIN_FILENO); |
9aa82023 ZJS |
1217 | |
1218 | finish: | |
9a435388 | 1219 | iovw = iovw_free_free(iovw); |
9aa82023 | 1220 | return r; |
3c171f0b | 1221 | } |
34c10968 | 1222 | |
988e89ee | 1223 | static int process_backtrace(int argc, char *argv[]) { |
f46c706b | 1224 | Context context = {}; |
9a435388 FB |
1225 | struct iovec_wrapper *iovw; |
1226 | char *message; | |
1227 | size_t i; | |
988e89ee | 1228 | int r; |
11e6d971 | 1229 | _cleanup_(journal_importer_cleanup) JournalImporter importer = JOURNAL_IMPORTER_INIT(STDIN_FILENO); |
988e89ee ZJS |
1230 | |
1231 | log_debug("Processing backtrace on stdin..."); | |
1232 | ||
9a435388 FB |
1233 | iovw = iovw_new(); |
1234 | if (!iovw) | |
5b45a160 ZJS |
1235 | return log_oom(); |
1236 | ||
2a3bebd0 FB |
1237 | (void) iovw_put_string_field(iovw, "MESSAGE_ID=", SD_MESSAGE_BACKTRACE_STR); |
1238 | (void) iovw_put_string_field(iovw, "PRIORITY=", STRINGIFY(LOG_CRIT)); | |
f46c706b FB |
1239 | |
1240 | /* Collect all process metadata from argv[] by making sure to skip the | |
1241 | * '--backtrace' option */ | |
1242 | r = gather_pid_metadata_from_argv(iovw, &context, argc - 2, argv + 2); | |
988e89ee ZJS |
1243 | if (r < 0) |
1244 | goto finish; | |
aaeb2522 | 1245 | |
f46c706b FB |
1246 | /* Collect the rest of the process metadata retrieved from the runtime */ |
1247 | r = gather_pid_metadata(iovw, &context); | |
1248 | if (r < 0) | |
1249 | goto finish; | |
988e89ee | 1250 | |
86562420 | 1251 | for (;;) { |
5b45a160 ZJS |
1252 | r = journal_importer_process_data(&importer); |
1253 | if (r < 0) { | |
1254 | log_error_errno(r, "Failed to parse journal entry on stdin: %m"); | |
1255 | goto finish; | |
1256 | } | |
d74dc4f2 ZJS |
1257 | if (r == 1 || /* complete entry */ |
1258 | journal_importer_eof(&importer)) /* end of data */ | |
5b45a160 | 1259 | break; |
988e89ee | 1260 | } |
988e89ee | 1261 | |
5b45a160 ZJS |
1262 | if (journal_importer_eof(&importer)) { |
1263 | log_warning("Did not receive a full journal entry on stdin, ignoring message sent by reporter"); | |
988e89ee | 1264 | |
f46c706b FB |
1265 | message = strjoina("Process ", context.meta[META_ARGV_PID], |
1266 | " (", context.meta[META_COMM], ")" | |
1267 | " of user ", context.meta[META_ARGV_UID], | |
1268 | " failed with ", context.meta[META_ARGV_SIGNAL]); | |
9a435388 FB |
1269 | |
1270 | r = iovw_put_string_field(iovw, "MESSAGE=", message); | |
1271 | if (r < 0) | |
1272 | return r; | |
5b45a160 | 1273 | } else { |
9a435388 FB |
1274 | /* The imported iovecs are not supposed to be freed by us so let's store |
1275 | * them at the end of the array so we can skip them while freeing the | |
1276 | * rest. */ | |
9a435388 FB |
1277 | for (i = 0; i < importer.iovw.count; i++) { |
1278 | struct iovec *iovec = importer.iovw.iovec + i; | |
988e89ee | 1279 | |
9a435388 FB |
1280 | iovw_put(iovw, iovec->iov_base, iovec->iov_len); |
1281 | } | |
1282 | } | |
988e89ee | 1283 | |
9a435388 | 1284 | r = sd_journal_sendv(iovw->iovec, iovw->count); |
988e89ee ZJS |
1285 | if (r < 0) |
1286 | log_error_errno(r, "Failed to log backtrace: %m"); | |
1287 | ||
1288 | finish: | |
9a435388 FB |
1289 | iovw->count -= importer.iovw.count; |
1290 | iovw = iovw_free_free(iovw); | |
988e89ee ZJS |
1291 | return r; |
1292 | } | |
1293 | ||
4515a95e | 1294 | static int run(int argc, char *argv[]) { |
3c171f0b | 1295 | int r; |
fee80f69 | 1296 | |
9aa82023 ZJS |
1297 | /* First, log to a safe place, since we don't know what crashed and it might |
1298 | * be journald which we'd rather not log to then. */ | |
8d4e028f | 1299 | |
3c171f0b LP |
1300 | log_set_target(LOG_TARGET_KMSG); |
1301 | log_open(); | |
8d4e028f | 1302 | |
3c171f0b LP |
1303 | /* Make sure we never enter a loop */ |
1304 | (void) prctl(PR_SET_DUMPABLE, 0); | |
8d4e028f | 1305 | |
3c171f0b LP |
1306 | /* Ignore all parse errors */ |
1307 | (void) parse_config(); | |
fee80f69 | 1308 | |
3c171f0b LP |
1309 | log_debug("Selected storage '%s'.", coredump_storage_to_string(arg_storage)); |
1310 | log_debug("Selected compression %s.", yes_no(arg_compress)); | |
fee80f69 | 1311 | |
3c171f0b | 1312 | r = sd_listen_fds(false); |
4515a95e ZJS |
1313 | if (r < 0) |
1314 | return log_error_errno(r, "Failed to determine the number of file descriptors: %m"); | |
fee80f69 | 1315 | |
9aa82023 ZJS |
1316 | /* If we got an fd passed, we are running in coredumpd mode. Otherwise we |
1317 | * are invoked from the kernel as coredump handler. */ | |
988e89ee ZJS |
1318 | if (r == 0) { |
1319 | if (streq_ptr(argv[1], "--backtrace")) | |
4515a95e | 1320 | return process_backtrace(argc, argv); |
988e89ee | 1321 | else |
4515a95e | 1322 | return process_kernel(argc, argv); |
988e89ee | 1323 | } else if (r == 1) |
4515a95e | 1324 | return process_socket(SD_LISTEN_FDS_START); |
f5e04665 | 1325 | |
baaa35ad ZJS |
1326 | return log_error_errno(SYNTHETIC_ERRNO(EINVAL), |
1327 | "Received unexpected number of file descriptors."); | |
f5e04665 | 1328 | } |
4515a95e ZJS |
1329 | |
1330 | DEFINE_MAIN_FUNCTION(run); |