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rpcbind: Do not use signal-unsafe functions in SIGTERM handler

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syslog(3), routines used in write_warmstart(), and exit(3) are all
signal-unsafe.  Instead, set a signal-safe flag and check the flag in the
rpcbind main loop to shutdown safely.

PR:		224503
Reviewed by:	kib, markj
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D13728
This commit is contained in:
Conrad Meyer 2018-01-02 00:48:19 +00:00
parent 9fbe631a1a
commit 055569f608
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=327482
3 changed files with 19 additions and 10 deletions
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10
usr.sbin/rpcbind/rpcb_svc_com.c
View File

@ -1136,6 +1136,16 @@ my_svc_run(void)
* that it was set by the signal handlers (or any
* other outside event) and not caused by poll().
*/
if (doterminate != 0) {
close(rpcbindlockfd);
#ifdef WARMSTART
syslog(LOG_ERR,
"rpcbind terminating on signal %d. Restart with \"rpcbind -w\"",
(int)doterminate);
write_warmstart(); /* Dump yourself */
#endif
exit(2);
}
case 0:
cleanfds = svc_fdset;
__svc_clean_idle(&cleanfds, 30, FALSE);

15
usr.sbin/rpcbind/rpcbind.c
View File

@ -79,7 +79,9 @@ static char sccsid[] = "@(#)rpcbind.c 1.35 89/04/21 Copyr 1984 Sun Micro";
/* Global variables */
int debugging = 0; /* Tell me what's going on */
int doabort = 0; /* When debugging, do an abort on errors */
volatile sig_atomic_t doterminate = 0; /* Terminal signal received */
rpcblist_ptr list_rbl; /* A list of version 3/4 rpcbind services */
int rpcbindlockfd;
/* who to suid to if -s is given */
#define RUN_AS "daemon"
@ -99,7 +101,6 @@ static struct sockaddr **bound_sa;
static int ipv6_only = 0;
static int nhosts = 0;
static int on = 1;
static int rpcbindlockfd;
#ifdef WARMSTART
/* Local Variable */
@ -758,16 +759,10 @@ rbllist_add(rpcprog_t prog, rpcvers_t vers, struct netconfig *nconf,
* Catch the signal and die
*/
static void
terminate(int signum __unused)
terminate(int signum)
{
close(rpcbindlockfd);
#ifdef WARMSTART
syslog(LOG_ERR,
"rpcbind terminating on signal %d. Restart with \"rpcbind -w\"",
signum);
write_warmstart(); /* Dump yourself */
#endif
exit(2);
doterminate = signum;
}
void

4
usr.sbin/rpcbind/rpcbind.h
View File

@ -44,6 +44,8 @@
#ifndef rpcbind_h
#define rpcbind_h
#include <signal.h>
#ifdef PORTMAP
#include <rpc/pmap_prot.h>
#endif
@ -68,6 +70,7 @@ struct r_rmtcall_args {
extern int debugging;
extern int doabort;
extern volatile sig_atomic_t doterminate;
#ifdef LIBWRAP
extern int libwrap;
#endif
@ -75,6 +78,7 @@ extern int verboselog;
extern int insecure;
extern int oldstyle_local;
extern rpcblist_ptr list_rbl; /* A list of version 3 & 4 rpcbind services */
extern int rpcbindlockfd;
#ifdef PORTMAP
extern struct pmaplist *list_pml; /* A list of version 2 rpcbind services */