mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-16 10:20:30 +00:00
8efc4eff00
0xdeadc0de and then check for it just before memory is handed off as part of a new request. This will catch any post free/pre alloc modification of memory, as well as introduce errors for anything that tries to dereference it as a pointer. This code takes the form of special init, fini, ctor and dtor routines that are specificly used by malloc. It is in a seperate file because additional debugging aids will want to live here as well.
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/*
|
|
* Copyright (c) 2002, Jeffrey Roberson <jroberson@chesapeake.net>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice unmodified, this list of conditions, and the following
|
|
* disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* uma_dbg.c Debugging features for UMA users
|
|
*
|
|
*/
|
|
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/types.h>
|
|
#include <sys/queue.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
|
|
#include <machine/types.h>
|
|
|
|
#include <vm/uma.h>
|
|
#include <vm/uma_int.h>
|
|
#include <vm/uma_dbg.h>
|
|
|
|
static const u_int32_t uma_junk = 0xdeadc0de;
|
|
|
|
/*
|
|
* Checks an item to make sure it hasn't been overwritten since freed.
|
|
*
|
|
* Complies with standard ctor arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_ctor(void *mem, int size, void *arg)
|
|
{
|
|
int cnt;
|
|
u_int32_t *p;
|
|
|
|
cnt = size / sizeof(uma_junk);
|
|
|
|
for (p = mem; cnt > 0; cnt--, p++)
|
|
if (*p != uma_junk)
|
|
panic("Memory modified after free %p(%d)\n",
|
|
mem, size);
|
|
}
|
|
|
|
/*
|
|
* Fills an item with predictable garbage
|
|
*
|
|
* Complies with standard dtor arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_dtor(void *mem, int size, void *arg)
|
|
{
|
|
int cnt;
|
|
u_int32_t *p;
|
|
|
|
cnt = size / sizeof(uma_junk);
|
|
|
|
for (p = mem; cnt > 0; cnt--, p++)
|
|
*p = uma_junk;
|
|
}
|
|
|
|
/*
|
|
* Fills an item with predictable garbage
|
|
*
|
|
* Complies with standard init arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_init(void *mem, int size)
|
|
{
|
|
trash_dtor(mem, size, NULL);
|
|
}
|
|
|
|
/*
|
|
* Checks an item to make sure it hasn't been overwritten since it was freed.
|
|
*
|
|
* Complies with standard fini arg/return
|
|
*
|
|
*/
|
|
void
|
|
trash_fini(void *mem, int size)
|
|
{
|
|
trash_ctor(mem, size, NULL);
|
|
}
|