From: "Patrick O'Rourke" <porourke@egenera.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH] Prevent max_threads from exceeding PID_MAX
Date: Thu, 7 Mar 2002 15:45:17 -0500 (EST) [thread overview]
Message-ID: <200203072045.PAA08386@egenera.com> (raw)
It is possible on large memory systems that the default process limits
can exceed PID_MAX. This will allow a non-root user to consume all pids
resulting in the kernel to basically hang in get_pid().
The following patch to fork_init() will prevent max_threads from exceeding
PID_MAX.
Pat
--- linux-2.4.19-pre2-x/kernel/fork.c Mon Feb 25 14:38:13 2002
+++ linux-2.4.19-pre2/kernel/fork.c Wed Mar 6 09:15:17 2002
@@ -74,6 +74,11 @@
*/
max_threads = mempages / (THREAD_SIZE/PAGE_SIZE) / 8;
+ /* don't let threads go beyond PID_MAX */
+ if (max_threads > PID_MAX) {
+ max_threads = PID_MAX;
+ }
+
init_task.rlim[RLIMIT_NPROC].rlim_cur = max_threads/2;
init_task.rlim[RLIMIT_NPROC].rlim_max = max_threads/2;
}
next reply other threads:[~2002-03-07 20:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-07 20:45 Patrick O'Rourke [this message]
2002-03-07 22:11 ` [PATCH] Prevent max_threads from exceeding PID_MAX Paul Larson
2002-03-07 22:23 ` [PATCH] Fix for get_pid hang Paul Larson
2002-03-07 22:25 ` Paul Larson
2002-03-08 15:02 ` Patrick O'Rourke
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