63 lines
1.8 KiB
C
63 lines
1.8 KiB
C
/*
|
|
* Copyright 2006, Red Hat, Inc., Dave Jones
|
|
* Released under the General Public License (GPL).
|
|
*
|
|
* This file contains the linked list validation for DEBUG_LIST.
|
|
*/
|
|
|
|
#include <linux/export.h>
|
|
#include <linux/list.h>
|
|
#include <linux/bug.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/rculist.h>
|
|
|
|
/*
|
|
* Check that the data structures for the list manipulations are reasonably
|
|
* valid. Failures here indicate memory corruption (and possibly an exploit
|
|
* attempt).
|
|
*/
|
|
|
|
bool __list_add_valid(struct list_head *new, struct list_head *prev,
|
|
struct list_head *next)
|
|
{
|
|
if (CHECK_DATA_CORRUPTION(next->prev != prev,
|
|
"list_add corruption. next->prev should be prev (%p), but was %p. (next=%p).\n",
|
|
prev, next->prev, next) ||
|
|
CHECK_DATA_CORRUPTION(prev->next != next,
|
|
"list_add corruption. prev->next should be next (%p), but was %p. (prev=%p).\n",
|
|
next, prev->next, prev) ||
|
|
CHECK_DATA_CORRUPTION(new == prev || new == next,
|
|
"list_add double add: new=%p, prev=%p, next=%p.\n",
|
|
new, prev, next))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(__list_add_valid);
|
|
|
|
bool __list_del_entry_valid(struct list_head *entry)
|
|
{
|
|
struct list_head *prev, *next;
|
|
|
|
prev = entry->prev;
|
|
next = entry->next;
|
|
|
|
if (CHECK_DATA_CORRUPTION(next == LIST_POISON1,
|
|
"list_del corruption, %p->next is LIST_POISON1 (%p)\n",
|
|
entry, LIST_POISON1) ||
|
|
CHECK_DATA_CORRUPTION(prev == LIST_POISON2,
|
|
"list_del corruption, %p->prev is LIST_POISON2 (%p)\n",
|
|
entry, LIST_POISON2) ||
|
|
CHECK_DATA_CORRUPTION(prev->next != entry,
|
|
"list_del corruption. prev->next should be %p, but was %p\n",
|
|
entry, prev->next) ||
|
|
CHECK_DATA_CORRUPTION(next->prev != entry,
|
|
"list_del corruption. next->prev should be %p, but was %p\n",
|
|
entry, next->prev))
|
|
return false;
|
|
|
|
return true;
|
|
|
|
}
|
|
EXPORT_SYMBOL(__list_del_entry_valid);
|