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Enable KMEM_SIZE on DIAGNOSTIC. It will catch memory corruption bugs due to a 

different size given to kmem_alloc() and kmem_free(), with no performance
impact.
This commit is contained in:
maxv 2014-06-23 17:43:42 +00:00
parent ce5b0434fc
commit f7c9f4d7c3
1 changed files with 8 additions and 4 deletions
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12
sys/kern/subr_kmem.c
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@ -1,4 +1,4 @@
/* $NetBSD: subr_kmem.c,v 1.52 2014/06/22 17:36:42 maxv Exp $ */
/* $NetBSD: subr_kmem.c,v 1.53 2014/06/23 17:43:42 maxv Exp $ */
/*-
* Copyright (c) 2009 The NetBSD Foundation, Inc.
@ -60,7 +60,8 @@
*/
/*
* This allocator has some debug features enabled with "option DEBUG".
* This allocator has some debug features enabled with "option DEBUG" and
* "option DIAGNOSTIC".
*
* KMEM_POISON
* Try to detect modify-after-free bugs.
@ -102,7 +103,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: subr_kmem.c,v 1.52 2014/06/22 17:36:42 maxv Exp $");
__KERNEL_RCSID(0, "$NetBSD: subr_kmem.c,v 1.53 2014/06/23 17:43:42 maxv Exp $");
#include <sys/param.h>
#include <sys/callback.h>
@ -178,10 +179,13 @@ static size_t kmem_cache_maxidx __read_mostly;
static pool_cache_t kmem_cache_big[KMEM_CACHE_BIG_COUNT] __cacheline_aligned;
static size_t kmem_cache_big_maxidx __read_mostly;
#if defined(DIAGNOSTIC) && defined(_HARDKERNEL)
#define KMEM_SIZE
#endif /* defined(DIAGNOSTIC) */
#if defined(DEBUG) && defined(_HARDKERNEL)
#define KMEM_POISON
#define KMEM_REDZONE
#define KMEM_SIZE
#define KMEM_GUARD
#endif /* defined(DEBUG) */