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Code Issues Releases Activity

Avoid allocating MAXHOSTNAMELEN bytes on the stack in expand_name(),

Browse Source 
use the heap instead.

Obtained from: Juniper Networks

Reviewed by:	jhb
This commit is contained in:
Alfred Perlstein 2010-04-30 03:15:00 +00:00
parent fba6b1af2e
commit b7402d8269
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=207418
1 changed files with 19 additions and 3 deletions
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22
sys/kern/kern_sig.c
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@ -3004,8 +3004,9 @@ expand_name(const char *name, uid_t uid, pid_t pid, struct thread *td,
char *temp;
size_t i;
int indexpos;
char hostname[MAXHOSTNAMELEN];
char *hostname;
hostname = NULL;
format = corefilename;
temp = malloc(MAXPATHLEN, M_TEMP, M_NOWAIT | M_ZERO);
if (temp == NULL)
@ -3021,8 +3022,21 @@ expand_name(const char *name, uid_t uid, pid_t pid, struct thread *td,
sbuf_putc(&sb, '%');
break;
case 'H': /* hostname */
if (hostname == NULL) {
hostname = malloc(MAXHOSTNAMELEN,
M_TEMP, M_NOWAIT);
if (hostname == NULL) {
log(LOG_ERR,
"pid %ld (%s), uid (%lu): "
"unable to alloc memory "
"for corefile hostname\n",
(long)pid, name,
(u_long)uid);
goto nomem;
}
}
getcredhostname(td->td_ucred, hostname,
sizeof(hostname));
MAXHOSTNAMELEN);
sbuf_printf(&sb, "%s", hostname);
break;
case 'I': /* autoincrementing index */
@ -3048,15 +3062,17 @@ expand_name(const char *name, uid_t uid, pid_t pid, struct thread *td,
sbuf_putc(&sb, format[i]);
}
}
free(hostname, M_TEMP);
#ifdef COMPRESS_USER_CORES
if (compress) {
sbuf_printf(&sb, GZ_SUFFIX);
}
#endif
if (sbuf_overflowed(&sb)) {
sbuf_delete(&sb);
log(LOG_ERR, "pid %ld (%s), uid (%lu): corename is too "
"long\n", (long)pid, name, (u_long)uid);
nomem:
sbuf_delete(&sb);
free(temp, M_TEMP);
return (NULL);
}