** Also affects: libnss-ldap (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: libnss-ldap (Ubuntu Yakkety)
Importance: Undecided
Status: New
** Also affects: libnss-ldap (Ubuntu Trusty)
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of नेपाली
भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1397250
Title:
SIGPIPE not caught in do_atfork_child()
Status in nss_ldap:
Fix Released
Status in libnss-ldap package in Ubuntu:
Triaged
Status in libnss-ldap source package in Trusty:
New
Status in libnss-ldap source package in Xenial:
New
Status in libnss-ldap source package in Yakkety:
New
Bug description:
Ubuntu version: Ubuntu 14.04.1 LTS
Package version: libnss-ldap_264-2.2ubuntu4
If a process using libnss-ldap calls fork() and SIGPIPE was blocked, the
atfork() handler in the child process failed to catch the SIGPIPE as it was
supposed to do, that is in the call to do_close_no_unbind(). So that, the
uncaught SIGPIPE will be eventually
delivered when the child unblocks signals. This usually make the child
process die unexpectedly.
I found a well-known Linux vendor fixed this issue with the following
patch. This unblocks the SIGPIPE before calling do_close_no_unbind()
and restores the original sigmask afterwards:
diff -up nss_ldap/ldap-nss.c nss_ldap/ldap-nss.c
--- nss_ldap/ldap-nss.c 2009-12-07 20:57:33.000000000 -0500
+++ nss_ldap/ldap-nss.c 2009-12-07 20:58:56.000000000 -0500
@@ -532,8 +532,13 @@
static void
do_atfork_child (void)
{
+ sigset_t unblock, mask;
debug ("==> do_atfork_child");
+ sigemptyset(&unblock);
+ sigaddset(&unblock, SIGPIPE);
+ sigprocmask(SIG_UNBLOCK, &unblock, &mask);
do_close_no_unbind ();
+ sigprocmask(SIG_SETMASK, &mask, NULL);
_nss_ldap_leave ();
debug ("<== do_atfork_child");
}
I'd like to see this patch applied.
To manage notifications about this bug go to:
https://bugs.launchpad.net/nss-ldap/+bug/1397250/+subscriptions
_______________________________________________
Mailing list: https://launchpad.net/~group.of.nepali.translators
Post to : [email protected]
Unsubscribe : https://launchpad.net/~group.of.nepali.translators
More help : https://help.launchpad.net/ListHelp
