2006-09-29 08:59:00 +00:00
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/*
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* Copyright 2006, Red Hat, Inc., Dave Jones
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* Released under the General Public License (GPL).
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*
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2016-08-17 21:42:08 +00:00
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* This file contains the linked list validation for DEBUG_LIST.
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2006-09-29 08:59:00 +00:00
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*/
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2011-11-17 02:29:17 +00:00
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#include <linux/export.h>
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2006-09-29 08:59:00 +00:00
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#include <linux/list.h>
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2012-01-20 23:35:53 +00:00
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#include <linux/bug.h>
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2012-01-20 23:46:49 +00:00
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#include <linux/kernel.h>
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2012-03-15 02:17:39 +00:00
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#include <linux/rculist.h>
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2006-09-29 08:59:00 +00:00
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/*
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2016-08-17 21:42:08 +00:00
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* Check that the data structures for the list manipulations are reasonably
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* valid. Failures here indicate memory corruption (and possibly an exploit
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* attempt).
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2006-09-29 08:59:00 +00:00
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*/
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2016-08-17 21:42:08 +00:00
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bool __list_add_valid(struct list_head *new, struct list_head *prev,
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struct list_head *next)
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2006-09-29 08:59:00 +00:00
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{
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2016-08-17 21:42:11 +00:00
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CHECK_DATA_CORRUPTION(next->prev != prev,
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"list_add corruption. next->prev should be prev (%p), but was %p. (next=%p).\n",
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prev, next->prev, next);
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CHECK_DATA_CORRUPTION(prev->next != next,
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"list_add corruption. prev->next should be next (%p), but was %p. (prev=%p).\n",
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next, prev->next, prev);
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CHECK_DATA_CORRUPTION(new == prev || new == next,
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"list_add double add: new=%p, prev=%p, next=%p.\n",
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new, prev, next);
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2016-08-17 21:42:08 +00:00
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return true;
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2006-09-29 08:59:00 +00:00
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}
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2016-08-17 21:42:08 +00:00
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EXPORT_SYMBOL(__list_add_valid);
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2006-09-29 08:59:00 +00:00
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2016-08-17 21:42:10 +00:00
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bool __list_del_entry_valid(struct list_head *entry)
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2011-02-18 19:32:28 +00:00
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{
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struct list_head *prev, *next;
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prev = entry->prev;
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next = entry->next;
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2016-08-17 21:42:11 +00:00
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CHECK_DATA_CORRUPTION(next == LIST_POISON1,
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"list_del corruption, %p->next is LIST_POISON1 (%p)\n",
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entry, LIST_POISON1);
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CHECK_DATA_CORRUPTION(prev == LIST_POISON2,
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"list_del corruption, %p->prev is LIST_POISON2 (%p)\n",
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entry, LIST_POISON2);
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CHECK_DATA_CORRUPTION(prev->next != entry,
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"list_del corruption. prev->next should be %p, but was %p\n",
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entry, prev->next);
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CHECK_DATA_CORRUPTION(next->prev != entry,
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"list_del corruption. next->prev should be %p, but was %p\n",
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entry, next->prev);
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2016-08-17 21:42:10 +00:00
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return true;
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2011-02-18 19:32:28 +00:00
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2006-09-29 08:59:00 +00:00
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}
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2016-08-17 21:42:10 +00:00
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EXPORT_SYMBOL(__list_del_entry_valid);
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