Commit | Line | Data |
---|---|---|
199a9afc DJ |
1 | /* |
2 | * Copyright 2006, Red Hat, Inc., Dave Jones | |
3 | * Released under the General Public License (GPL). | |
4 | * | |
c69780bd | 5 | * This file contains the linked list validation for DEBUG_LIST. |
199a9afc DJ |
6 | */ |
7 | ||
8bc3bcc9 | 8 | #include <linux/export.h> |
199a9afc | 9 | #include <linux/list.h> |
50af5ead | 10 | #include <linux/bug.h> |
b116ee4d | 11 | #include <linux/kernel.h> |
559f9bad | 12 | #include <linux/rculist.h> |
199a9afc DJ |
13 | |
14 | /* | |
c69780bd KC |
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). | |
199a9afc DJ |
18 | */ |
19 | ||
c69780bd KC |
20 | bool __list_add_valid(struct list_head *new, struct list_head *prev, |
21 | struct list_head *next) | |
199a9afc | 22 | { |
40cd725c KC |
23 | 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 | ||
c69780bd | 33 | return true; |
199a9afc | 34 | } |
c69780bd | 35 | EXPORT_SYMBOL(__list_add_valid); |
199a9afc | 36 | |
36c956ec | 37 | bool __list_del_entry_valid(struct list_head *entry) |
3c18d4de LT |
38 | { |
39 | struct list_head *prev, *next; | |
40 | ||
41 | prev = entry->prev; | |
42 | next = entry->next; | |
43 | ||
40cd725c KC |
44 | CHECK_DATA_CORRUPTION(next == LIST_POISON1, |
45 | "list_del corruption, %p->next is LIST_POISON1 (%p)\n", | |
46 | entry, LIST_POISON1); | |
47 | CHECK_DATA_CORRUPTION(prev == LIST_POISON2, | |
48 | "list_del corruption, %p->prev is LIST_POISON2 (%p)\n", | |
49 | entry, LIST_POISON2); | |
50 | CHECK_DATA_CORRUPTION(prev->next != entry, | |
51 | "list_del corruption. prev->next should be %p, but was %p\n", | |
52 | entry, prev->next); | |
53 | CHECK_DATA_CORRUPTION(next->prev != entry, | |
54 | "list_del corruption. next->prev should be %p, but was %p\n", | |
55 | entry, next->prev); | |
36c956ec | 56 | return true; |
3c18d4de | 57 | |
199a9afc | 58 | } |
36c956ec | 59 | EXPORT_SYMBOL(__list_del_entry_valid); |