2 * Copyright 2006, Red Hat, Inc., Dave Jones
3 * Released under the General Public License (GPL).
5 * This file contains the linked list validation for DEBUG_LIST.
8 #include <linux/export.h>
9 #include <linux/list.h>
10 #include <linux/bug.h>
11 #include <linux/kernel.h>
12 #include <linux/rculist.h>
15 * Check that the data structures for the list manipulations are reasonably
16 * valid. Failures here indicate memory corruption (and possibly an exploit
20 bool __list_add_valid(struct list_head *new, struct list_head *prev,
21 struct list_head *next)
23 if (CHECK_DATA_CORRUPTION(prev == NULL,
24 "list_add corruption. prev is NULL.\n") ||
25 CHECK_DATA_CORRUPTION(next == NULL,
26 "list_add corruption. next is NULL.\n") ||
27 CHECK_DATA_CORRUPTION(next->prev != prev,
28 "list_add corruption. next->prev should be prev (%px), but was %px. (next=%px).\n",
29 prev, next->prev, next) ||
30 CHECK_DATA_CORRUPTION(prev->next != next,
31 "list_add corruption. prev->next should be next (%px), but was %px. (prev=%px).\n",
32 next, prev->next, prev) ||
33 CHECK_DATA_CORRUPTION(new == prev || new == next,
34 "list_add double add: new=%px, prev=%px, next=%px.\n",
40 EXPORT_SYMBOL(__list_add_valid);
42 bool __list_del_entry_valid(struct list_head *entry)
44 struct list_head *prev, *next;
49 if (CHECK_DATA_CORRUPTION(next == NULL,
50 "list_del corruption, %px->next is NULL\n", entry) ||
51 CHECK_DATA_CORRUPTION(prev == NULL,
52 "list_del corruption, %px->prev is NULL\n", entry) ||
53 CHECK_DATA_CORRUPTION(next == LIST_POISON1,
54 "list_del corruption, %px->next is LIST_POISON1 (%px)\n",
55 entry, LIST_POISON1) ||
56 CHECK_DATA_CORRUPTION(prev == LIST_POISON2,
57 "list_del corruption, %px->prev is LIST_POISON2 (%px)\n",
58 entry, LIST_POISON2) ||
59 CHECK_DATA_CORRUPTION(prev->next != entry,
60 "list_del corruption. prev->next should be %px, but was %px. (prev=%px)\n",
61 entry, prev->next, prev) ||
62 CHECK_DATA_CORRUPTION(next->prev != entry,
63 "list_del corruption. next->prev should be %px, but was %px. (next=%px)\n",
64 entry, next->prev, next))
70 EXPORT_SYMBOL(__list_del_entry_valid);