diff options
author | Akinobu Mita <akinobu.mita@gmail.com> | 2009-03-31 18:23:17 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-01 11:59:13 -0400 |
commit | 6a11f75b6a17b5d9ac5025f8d048382fd1f47377 (patch) | |
tree | a3415cd897823975b927f89a233d2703bf97ba2b /include/linux/poison.h | |
parent | 610a77e04a8d9fe8764dc484e2182fa251ce1cc2 (diff) |
generic debug pagealloc
CONFIG_DEBUG_PAGEALLOC is now supported by x86, powerpc, sparc64, and
s390. This patch implements it for the rest of the architectures by
filling the pages with poison byte patterns after free_pages() and
verifying the poison patterns before alloc_pages().
This generic one cannot detect invalid page accesses immediately but
invalid read access may cause invalid dereference by poisoned memory and
invalid write access can be detected after a long delay.
Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/poison.h')
-rw-r--r-- | include/linux/poison.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/poison.h b/include/linux/poison.h index 9f31683728fd..6729f7dcd60e 100644 --- a/include/linux/poison.h +++ b/include/linux/poison.h | |||
@@ -17,6 +17,9 @@ | |||
17 | */ | 17 | */ |
18 | #define TIMER_ENTRY_STATIC ((void *) 0x74737461) | 18 | #define TIMER_ENTRY_STATIC ((void *) 0x74737461) |
19 | 19 | ||
20 | /********** mm/debug-pagealloc.c **********/ | ||
21 | #define PAGE_POISON 0xaa | ||
22 | |||
20 | /********** mm/slab.c **********/ | 23 | /********** mm/slab.c **********/ |
21 | /* | 24 | /* |
22 | * Magic nums for obj red zoning. | 25 | * Magic nums for obj red zoning. |