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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> | |
23 | #include <unistd.h> | |
803a3464 LP |
24 | #include <stdio.h> |
25 | #include <sys/prctl.h> | |
f5e04665 LP |
26 | |
27 | #include <systemd/sd-journal.h> | |
28 | #include <systemd/sd-login.h> | |
29 | ||
30 | #include "log.h" | |
31 | #include "util.h" | |
49e942b2 | 32 | #include "mkdir.h" |
803a3464 | 33 | #include "special.h" |
f5e04665 | 34 | |
de0229ca | 35 | #define COREDUMP_MAX (24*1024*1024) |
f5e04665 LP |
36 | |
37 | enum { | |
38 | ARG_PID = 1, | |
39 | ARG_UID, | |
40 | ARG_GID, | |
41 | ARG_SIGNAL, | |
42 | ARG_TIMESTAMP, | |
43 | ARG_COMM, | |
44 | _ARG_MAX | |
45 | }; | |
46 | ||
803a3464 LP |
47 | static int divert_coredump(void) { |
48 | FILE *f; | |
49 | int r; | |
50 | ||
51 | log_info("Detected coredump of the journal daemon itself, diverting coredump to /var/lib/systemd/coredump/."); | |
52 | ||
53 | mkdir_p("/var/lib/systemd/coredump", 0755); | |
54 | ||
55 | f = fopen("/var/lib/systemd/coredump/core.systemd-journald", "we"); | |
56 | if (!f) { | |
57 | log_error("Failed to create coredump file: %m"); | |
58 | return -errno; | |
59 | } | |
60 | ||
61 | for (;;) { | |
62 | uint8_t buffer[4096]; | |
63 | size_t l, q; | |
64 | ||
65 | l = fread(buffer, 1, sizeof(buffer), stdin); | |
66 | if (l <= 0) { | |
67 | if (ferror(f)) { | |
68 | log_error("Failed to read coredump: %m"); | |
69 | r = -errno; | |
70 | goto finish; | |
71 | } | |
72 | ||
73 | r = 0; | |
74 | break; | |
75 | } | |
76 | ||
77 | q = fwrite(buffer, 1, l, f); | |
78 | if (q != l) { | |
79 | log_error("Failed to write coredump: %m"); | |
80 | r = -errno; | |
81 | goto finish; | |
82 | } | |
83 | } | |
84 | ||
85 | fflush(f); | |
86 | ||
87 | if (ferror(f)) { | |
88 | log_error("Failed to write coredump: %m"); | |
89 | r = -errno; | |
90 | } | |
91 | ||
92 | finish: | |
93 | fclose(f); | |
94 | return r; | |
95 | } | |
96 | ||
f5e04665 LP |
97 | int main(int argc, char* argv[]) { |
98 | int r, j = 0; | |
99 | char *p = NULL; | |
100 | ssize_t n; | |
101 | pid_t pid; | |
fee80f69 LP |
102 | uid_t uid; |
103 | gid_t gid; | |
f5e04665 LP |
104 | struct iovec iovec[14]; |
105 | char *core_pid = NULL, *core_uid = NULL, *core_gid = NULL, *core_signal = NULL, | |
106 | *core_timestamp = NULL, *core_comm = NULL, *core_exe = NULL, *core_unit = NULL, | |
107 | *core_session = NULL, *core_message = NULL, *core_cmdline = NULL, *t; | |
108 | ||
803a3464 | 109 | prctl(PR_SET_DUMPABLE, 0); |
f5e04665 LP |
110 | |
111 | if (argc != _ARG_MAX) { | |
803a3464 LP |
112 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
113 | log_open(); | |
114 | ||
f5e04665 LP |
115 | log_error("Invalid number of arguments passed from kernel."); |
116 | r = -EINVAL; | |
117 | goto finish; | |
118 | } | |
119 | ||
120 | r = parse_pid(argv[ARG_PID], &pid); | |
121 | if (r < 0) { | |
803a3464 LP |
122 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); |
123 | log_open(); | |
124 | ||
f5e04665 | 125 | log_error("Failed to parse PID."); |
f5e04665 LP |
126 | goto finish; |
127 | } | |
128 | ||
803a3464 LP |
129 | if (sd_pid_get_unit(pid, &t) >= 0) { |
130 | ||
131 | if (streq(t, SPECIAL_JOURNALD_SERVICE)) { | |
132 | /* Make sure we don't make use of the journal, | |
133 | * if it's the journal which is crashing */ | |
134 | log_set_target(LOG_TARGET_KMSG); | |
135 | log_open(); | |
136 | ||
137 | r = divert_coredump(); | |
138 | goto finish; | |
139 | } | |
140 | ||
141 | core_unit = strappend("COREDUMP_UNIT=", t); | |
142 | free(t); | |
143 | ||
144 | if (core_unit) | |
145 | IOVEC_SET_STRING(iovec[j++], core_unit); | |
146 | } | |
147 | ||
148 | /* OK, now we know it's not the journal, hence make use of | |
149 | * it */ | |
150 | log_set_target(LOG_TARGET_JOURNAL_OR_KMSG); | |
151 | log_open(); | |
152 | ||
fee80f69 LP |
153 | r = parse_uid(argv[ARG_UID], &uid); |
154 | if (r < 0) { | |
155 | log_error("Failed to parse UID."); | |
f5e04665 LP |
156 | goto finish; |
157 | } | |
158 | ||
fee80f69 LP |
159 | r = parse_gid(argv[ARG_GID], &gid); |
160 | if (r < 0) { | |
161 | log_error("Failed to parse GID."); | |
f5e04665 LP |
162 | goto finish; |
163 | } | |
164 | ||
f5e04665 LP |
165 | core_pid = strappend("COREDUMP_PID=", argv[ARG_PID]); |
166 | if (core_pid) | |
167 | IOVEC_SET_STRING(iovec[j++], core_pid); | |
168 | ||
169 | core_uid = strappend("COREDUMP_UID=", argv[ARG_UID]); | |
170 | if (core_uid) | |
171 | IOVEC_SET_STRING(iovec[j++], core_uid); | |
172 | ||
173 | core_gid = strappend("COREDUMP_GID=", argv[ARG_GID]); | |
174 | if (core_gid) | |
175 | IOVEC_SET_STRING(iovec[j++], core_gid); | |
176 | ||
177 | core_signal = strappend("COREDUMP_SIGNAL=", argv[ARG_SIGNAL]); | |
178 | if (core_signal) | |
179 | IOVEC_SET_STRING(iovec[j++], core_signal); | |
180 | ||
181 | core_comm = strappend("COREDUMP_COMM=", argv[ARG_COMM]); | |
182 | if (core_comm) | |
183 | IOVEC_SET_STRING(iovec[j++], core_comm); | |
184 | ||
185 | if (sd_pid_get_session(pid, &t) >= 0) { | |
186 | core_session = strappend("COREDUMP_SESSION=", t); | |
187 | free(t); | |
188 | ||
189 | if (core_session) | |
190 | IOVEC_SET_STRING(iovec[j++], core_session); | |
191 | } | |
192 | ||
f5e04665 LP |
193 | if (get_process_exe(pid, &t) >= 0) { |
194 | core_exe = strappend("COREDUMP_EXE=", t); | |
195 | free(t); | |
196 | ||
197 | if (core_exe) | |
198 | IOVEC_SET_STRING(iovec[j++], core_exe); | |
199 | } | |
200 | ||
201 | if (get_process_cmdline(pid, LINE_MAX, false, &t) >= 0) { | |
202 | core_cmdline = strappend("COREDUMP_CMDLINE=", t); | |
203 | free(t); | |
204 | ||
205 | if (core_cmdline) | |
206 | IOVEC_SET_STRING(iovec[j++], core_cmdline); | |
207 | } | |
208 | ||
209 | core_timestamp = join("COREDUMP_TIMESTAMP=", argv[ARG_TIMESTAMP], "000000", NULL); | |
210 | if (core_timestamp) | |
211 | IOVEC_SET_STRING(iovec[j++], core_timestamp); | |
212 | ||
213 | IOVEC_SET_STRING(iovec[j++], "MESSAGE_ID=fc2e22bc6ee647b6b90729ab34a250b1"); | |
214 | IOVEC_SET_STRING(iovec[j++], "PRIORITY=2"); | |
215 | ||
216 | core_message = join("MESSAGE=Process ", argv[ARG_PID], " (", argv[ARG_COMM], ") dumped core.", NULL); | |
217 | if (core_message) | |
218 | IOVEC_SET_STRING(iovec[j++], core_message); | |
219 | ||
fee80f69 LP |
220 | /* Now, let's drop privileges to become the user who owns the |
221 | * segfaulted process and allocate the coredump memory under | |
222 | * his uid. This also ensures that the credentials journald | |
223 | * will see are the ones of the coredumping user, thus making | |
224 | * sure the user himself gets access to the core dump. */ | |
225 | ||
226 | if (setresgid(gid, gid, gid) < 0 || | |
227 | setresuid(uid, uid, uid) < 0) { | |
228 | log_error("Failed to drop privileges: %m"); | |
229 | r = -errno; | |
230 | goto finish; | |
231 | } | |
232 | ||
233 | p = malloc(9 + COREDUMP_MAX); | |
234 | if (!p) { | |
235 | log_error("Out of memory"); | |
236 | r = -ENOMEM; | |
237 | goto finish; | |
238 | } | |
239 | ||
240 | memcpy(p, "COREDUMP=", 9); | |
241 | ||
242 | n = loop_read(STDIN_FILENO, p + 9, COREDUMP_MAX, false); | |
243 | if (n < 0) { | |
244 | log_error("Failed to read core dump data: %s", strerror(-n)); | |
245 | r = (int) n; | |
246 | goto finish; | |
247 | } | |
248 | ||
249 | iovec[j].iov_base = p; | |
250 | iovec[j].iov_len = 9 + n; | |
251 | j++; | |
252 | ||
f5e04665 LP |
253 | r = sd_journal_sendv(iovec, j); |
254 | if (r < 0) | |
255 | log_error("Failed to send coredump: %s", strerror(-r)); | |
256 | ||
257 | finish: | |
258 | free(p); | |
259 | free(core_pid); | |
260 | free(core_uid); | |
261 | free(core_gid); | |
262 | free(core_signal); | |
263 | free(core_timestamp); | |
264 | free(core_comm); | |
265 | free(core_exe); | |
266 | free(core_cmdline); | |
267 | free(core_unit); | |
268 | free(core_session); | |
269 | free(core_message); | |
270 | ||
271 | return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; | |
272 | } |