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/*
* Copyright 2006, Red Hat, Inc., Dave Jones
* Released under the General Public License (GPL).
*
* This file contains the linked list validation and error reporting for
* LIST_HARDENED and 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).
*/
__list_valid_slowpath
bool __list_add_valid_or_report(struct list_head *new, struct list_head *prev,
struct list_head *next)
{
if (CHECK_DATA_CORRUPTION(prev == NULL,
"list_add corruption. prev is NULL.\n") ||
CHECK_DATA_CORRUPTION(next == NULL,
"list_add corruption. next is NULL.\n") ||
CHECK_DATA_CORRUPTION(next->prev != prev,
"list_add corruption. next->prev should be prev (%px), but was %px. (next=%px).\n",
prev, next->prev, next) ||
CHECK_DATA_CORRUPTION(prev->next != next,
"list_add corruption. prev->next should be next (%px), but was %px. (prev=%px).\n",
next, prev->next, prev) ||
CHECK_DATA_CORRUPTION(new == prev || new == next,
"list_add double add: new=%px, prev=%px, next=%px.\n",
new, prev, next))
return false;
return true;
}
EXPORT_SYMBOL(__list_add_valid_or_report);
__list_valid_slowpath
bool __list_del_entry_valid_or_report(struct list_head *entry)
{
struct list_head *prev, *next;
prev = entry->prev;
next = entry->next;
if (CHECK_DATA_CORRUPTION(next == NULL,
"list_del corruption, %px->next is NULL\n", entry) ||
CHECK_DATA_CORRUPTION(prev == NULL,
"list_del corruption, %px->prev is NULL\n", entry) ||
CHECK_DATA_CORRUPTION(next == LIST_POISON1,
"list_del corruption, %px->next is LIST_POISON1 (%px)\n",
entry, LIST_POISON1) ||
CHECK_DATA_CORRUPTION(prev == LIST_POISON2,
"list_del corruption, %px->prev is LIST_POISON2 (%px)\n",
entry, LIST_POISON2) ||
CHECK_DATA_CORRUPTION(prev->next != entry,
"list_del corruption. prev->next should be %px, but was %px. (prev=%px)\n",
entry, prev->next, prev) ||
CHECK_DATA_CORRUPTION(next->prev != entry,
"list_del corruption. next->prev should be %px, but was %px. (next=%px)\n",
entry, next->prev, next))
return false;
return true;
}
EXPORT_SYMBOL(__list_del_entry_valid_or_report);
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