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1 | /* | |
2 | * Copyright 2006, Red Hat, Inc., Dave Jones | |
3 | * Released under the General Public License (GPL). | |
4 | * | |
5 | * This file contains the linked list validation for DEBUG_LIST. | |
6 | */ | |
7 | ||
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> | |
13 | ||
14 | /* | |
15 | * Check that the data structures for the list manipulations are reasonably | |
16 | * valid. Failures here indicate memory corruption (and possibly an exploit | |
17 | * attempt). | |
18 | */ | |
19 | ||
20 | bool __list_add_valid(struct list_head *new, struct list_head *prev, | |
21 | struct list_head *next) | |
22 | { | |
23 | if (CHECK_DATA_CORRUPTION(next->prev != prev, | |
24 | "list_add corruption. next->prev should be prev (%p), but was %p. (next=%p).\n", | |
25 | prev, next->prev, next) || | |
26 | CHECK_DATA_CORRUPTION(prev->next != next, | |
27 | "list_add corruption. prev->next should be next (%p), but was %p. (prev=%p).\n", | |
28 | next, prev->next, prev) || | |
29 | CHECK_DATA_CORRUPTION(new == prev || new == next, | |
30 | "list_add double add: new=%p, prev=%p, next=%p.\n", | |
31 | new, prev, next)) | |
32 | return false; | |
33 | ||
34 | return true; | |
35 | } | |
36 | EXPORT_SYMBOL(__list_add_valid); | |
37 | ||
38 | bool __list_del_entry_valid(struct list_head *entry) | |
39 | { | |
40 | struct list_head *prev, *next; | |
41 | ||
42 | prev = entry->prev; | |
43 | next = entry->next; | |
44 | ||
45 | if (CHECK_DATA_CORRUPTION(next == LIST_POISON1, | |
46 | "list_del corruption, %p->next is LIST_POISON1 (%p)\n", | |
47 | entry, LIST_POISON1) || | |
48 | CHECK_DATA_CORRUPTION(prev == LIST_POISON2, | |
49 | "list_del corruption, %p->prev is LIST_POISON2 (%p)\n", | |
50 | entry, LIST_POISON2) || | |
51 | CHECK_DATA_CORRUPTION(prev->next != entry, | |
52 | "list_del corruption. prev->next should be %p, but was %p\n", | |
53 | entry, prev->next) || | |
54 | CHECK_DATA_CORRUPTION(next->prev != entry, | |
55 | "list_del corruption. next->prev should be %p, but was %p\n", | |
56 | entry, next->prev)) | |
57 | return false; | |
58 | ||
59 | return true; | |
60 | ||
61 | } | |
62 | EXPORT_SYMBOL(__list_del_entry_valid); |