1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
|
/*
Unix SMB/CIFS implementation.
Critical Fault handling
Copyright (C) Andrew Tridgell 1992-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
static void (*cont_fn)(void *);
static char *corepath;
/*******************************************************************
report a fault
********************************************************************/
static void fault_report(int sig)
{
static int counter;
if (counter) _exit(1);
counter++;
DEBUGSEP(0);
DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),samba_version_string()));
DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba3-HOWTO\n"));
DEBUG(0,("\nFrom: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf\n"));
DEBUGSEP(0);
smb_panic("internal error");
if (cont_fn) {
cont_fn(NULL);
#ifdef SIGSEGV
CatchSignal(SIGSEGV,SIGNAL_CAST SIG_DFL);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST SIG_DFL);
#endif
#ifdef SIGABRT
CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
#endif
return; /* this should cause a core dump */
}
exit(1);
}
/****************************************************************************
catch serious errors
****************************************************************************/
static void sig_fault(int sig)
{
fault_report(sig);
}
/*******************************************************************
setup our fault handlers
********************************************************************/
void fault_setup(void (*fn)(void *))
{
cont_fn = fn;
#ifdef SIGSEGV
CatchSignal(SIGSEGV,SIGNAL_CAST sig_fault);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST sig_fault);
#endif
#ifdef SIGABRT
CatchSignal(SIGABRT,SIGNAL_CAST sig_fault);
#endif
}
/*******************************************************************
make all the preparations to safely dump a core file
********************************************************************/
void dump_core_setup(const char *progname)
{
char *logbase = NULL;
char *end = NULL;
if (lp_logfile() && *lp_logfile()) {
if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
return;
}
if ((end = strrchr_m(logbase, '/'))) {
*end = '\0';
}
} else {
/* We will end up here is the log file is given on the command
* line by the -l option but the "log file" option is not set
* in smb.conf.
*/
if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
return;
}
}
SMB_ASSERT(progname != NULL);
if (asprintf(&corepath, "%s/cores", logbase) < 0) {
SAFE_FREE(logbase);
return;
}
if (mkdir(corepath,0700) == -1) {
if (errno != EEXIST) {
SAFE_FREE(corepath);
SAFE_FREE(logbase);
return;
}
}
if (chmod(corepath,0700) == -1) {
SAFE_FREE(corepath);
SAFE_FREE(logbase);
return;
}
SAFE_FREE(corepath);
if (asprintf(&corepath, "%s/cores/%s",
logbase, progname) < 0) {
SAFE_FREE(logbase);
return;
}
if (mkdir(corepath,0700) == -1) {
if (errno != EEXIST) {
SAFE_FREE(corepath);
SAFE_FREE(logbase);
return;
}
}
if (chown(corepath,getuid(),getgid()) == -1) {
SAFE_FREE(corepath);
SAFE_FREE(logbase);
return;
}
if (chmod(corepath,0700) == -1) {
SAFE_FREE(corepath);
SAFE_FREE(logbase);
return;
}
SAFE_FREE(corepath);
SAFE_FREE(logbase);
#ifdef HAVE_GETRLIMIT
#ifdef RLIMIT_CORE
{
struct rlimit rlp;
getrlimit(RLIMIT_CORE, &rlp);
rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur);
setrlimit(RLIMIT_CORE, &rlp);
getrlimit(RLIMIT_CORE, &rlp);
DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n",
(int)rlp.rlim_cur,(int)rlp.rlim_max));
}
#endif
#endif
#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
/* On Linux we lose the ability to dump core when we change our user
* ID. We know how to dump core safely, so let's make sure we have our
* dumpable flag set.
*/
prctl(PR_SET_DUMPABLE, 1);
#endif
/* FIXME: if we have a core-plus-pid facility, configurably set
* this up here.
*/
}
void dump_core(void)
{
static bool called;
if (called) {
DEBUG(0, ("dump_core() called recursive\n"));
exit(1);
}
called = true;
/* Note that even if core dumping has been disabled, we still set up
* the core path. This is to handle the case where core dumping is
* turned on in smb.conf and the relevant daemon is not restarted.
*/
if (!lp_enable_core_files()) {
DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n"));
exit(1);
}
#if DUMP_CORE
/* If we're running as non root we might not be able to dump the core
* file to the corepath. There must not be an unbecome_root() before
* we call abort(). */
if (geteuid() != 0) {
become_root();
}
if (corepath == NULL) {
DEBUG(0, ("Can not dump core: corepath not set up\n"));
exit(1);
}
if (*corepath != '\0') {
/* The chdir might fail if we dump core before we finish
* processing the config file.
*/
if (chdir(corepath) != 0) {
DEBUG(0, ("unable to change to %s\n", corepath));
DEBUGADD(0, ("refusing to dump core\n"));
exit(1);
}
DEBUG(0,("dumping core in %s\n", corepath));
}
umask(~(0700));
dbgflush();
/* Ensure we don't have a signal handler for abort. */
#ifdef SIGABRT
CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
#endif
abort();
#else /* DUMP_CORE */
exit(1);
#endif /* DUMP_CORE */
}
|
