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;
}
-
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This archive was generated by hypermail 2b29 : Thu Mar 07 2002 - 21:01:08 EST