diff options
| author | Vegard Nossum <vegard.nossum@gmail.com> | 2008-04-04 00:51:41 +0200 |
|---|---|---|
| committer | Vegard Nossum <vegard.nossum@gmail.com> | 2009-06-13 15:37:30 +0200 |
| commit | dfec072ecd35ba6ecad2d51dde325253ac9a2936 (patch) | |
| tree | ccf682a631ef8edc0675d68d004bc3a80b34b648 /include/linux | |
| parent | e594c8de3bd4e7732ed3340fb01e18ec94b12df2 (diff) | |
kmemcheck: add the kmemcheck core
General description: kmemcheck is a patch to the linux kernel that
detects use of uninitialized memory. It does this by trapping every
read and write to memory that was allocated dynamically (e.g. using
kmalloc()). If a memory address is read that has not previously been
written to, a message is printed to the kernel log.
Thanks to Andi Kleen for the set_memory_4k() solution.
Andrew Morton suggested documenting the shadow member of struct page.
Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
[export kmemcheck_mark_initialized]
[build fix for setup_max_cpus]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
[rebased for mainline inclusion]
Signed-off-by: Vegard Nossum <vegardno@ifi.uio.no>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kmemcheck.h | 17 | ||||
| -rw-r--r-- | include/linux/mm_types.h | 8 |
2 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/kmemcheck.h b/include/linux/kmemcheck.h new file mode 100644 index 000000000000..39480c91b2f9 --- /dev/null +++ b/include/linux/kmemcheck.h @@ -0,0 +1,17 @@ +#ifndef LINUX_KMEMCHECK_H +#define LINUX_KMEMCHECK_H + +#include <linux/mm_types.h> +#include <linux/types.h> + +#ifdef CONFIG_KMEMCHECK +extern int kmemcheck_enabled; + +int kmemcheck_show_addr(unsigned long address); +int kmemcheck_hide_addr(unsigned long address); +#else +#define kmemcheck_enabled 0 + +#endif /* CONFIG_KMEMCHECK */ + +#endif /* LINUX_KMEMCHECK_H */ diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 0e80e26ecf21..0042090a4d70 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -98,6 +98,14 @@ struct page { #ifdef CONFIG_WANT_PAGE_DEBUG_FLAGS unsigned long debug_flags; /* Use atomic bitops on this */ #endif + +#ifdef CONFIG_KMEMCHECK + /* + * kmemcheck wants to track the status of each byte in a page; this + * is a pointer to such a status block. NULL if not tracked. + */ + void *shadow; +#endif }; /* |