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Set resource limit. The rnd_process_events() function is called every tick 

and process the sample queue. Without limitation, if a lot of rnd_add_*()
are called, all kernel memory may be eaten up.
This commit is contained in:
msaitoh 2013-01-16 06:45:24 +00:00
parent 2dda5775d9
commit 394ebb1bff
1 changed files with 13 additions and 3 deletions
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16
sys/kern/kern_rndq.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_rndq.c,v 1.6 2012/10/27 01:29:02 tls Exp $ */
/* $NetBSD: kern_rndq.c,v 1.7 2013/01/16 06:45:24 msaitoh Exp $ */
/*-
* Copyright (c) 1997-2011 The NetBSD Foundation, Inc.
@ -32,7 +32,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_rndq.c,v 1.6 2012/10/27 01:29:02 tls Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_rndq.c,v 1.7 2013/01/16 06:45:24 msaitoh Exp $");
#include <sys/param.h>
#include <sys/ioctl.h>
@ -405,7 +405,17 @@ rnd_init(void)
rnd_mempc = pool_cache_init(sizeof(rnd_sample_t), 0, 0, 0,
"rndsample", NULL, IPL_VM,
NULL, NULL, NULL);
/* Mix *something*, *anything* into the pool to help it get started.
/*
* Set resource limit. The rnd_process_events() function
* is called every tick and process the sample queue.
* Without limitation, if a lot of rnd_add_*() are called,
* all kernel memory may be eaten up.
*/
pool_cache_sethardlimit(rnd_mempc, RND_POOLBITS, NULL, 0);
/*
* Mix *something*, *anything* into the pool to help it get started.
* However, it's not safe for rnd_counter() to call microtime() yet,
* so on some platforms we might just end up with zeros anyway.
* XXX more things to add would be nice.