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Add SIGTHR (32) into list of signals permitted to be delivered to the

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suid application. The problem is that Linux applications using old Linux
threads (pre-NPTL) use signal 32 (linux SIGRTMIN) for communication between
thread-processes. If such an linux application is installed suid or sgid
and security.bsd.conservative_signals=1 (default), then permission will be
denied to send such a signal and the application will freeze.

I believe the same will be true for native applications that use libthr,
since libthr uses SIGTHR for implementing conditional variables.

PR:		72922
Submitted by:	Andriy Gapon <avg@icyb.net.ua>
MFC after:	2 weeks
This commit is contained in:
Maxim Sobolev 2005-02-11 14:02:42 +00:00
parent 282fae35d6
commit ac16ff40c5
1 changed files with 1 additions and 0 deletions
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sys/kern/kern_prot.c
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@ -1467,6 +1467,7 @@ cr_cansignal(struct ucred *cred, struct proc *proc, int signum)
case SIGHUP:
case SIGUSR1:
case SIGUSR2:
case SIGTHR:
/*
* Generally, permit job and terminal control
* signals.