From dfec072ecd35ba6ecad2d51dde325253ac9a2936 Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Fri, 4 Apr 2008 00:51:41 +0200 Subject: 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 Signed-off-by: Pekka Enberg [export kmemcheck_mark_initialized] [build fix for setup_max_cpus] Signed-off-by: Ingo Molnar [rebased for mainline inclusion] Signed-off-by: Vegard Nossum --- include/linux/kmemcheck.h | 17 +++++++++++++++++ include/linux/mm_types.h | 8 ++++++++ 2 files changed, 25 insertions(+) create mode 100644 include/linux/kmemcheck.h (limited to 'include/linux') diff --git a/include/linux/kmemcheck.h b/include/linux/kmemcheck.h new file mode 100644 index 00000000000..39480c91b2f --- /dev/null +++ b/include/linux/kmemcheck.h @@ -0,0 +1,17 @@ +#ifndef LINUX_KMEMCHECK_H +#define LINUX_KMEMCHECK_H + +#include +#include + +#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 0e80e26ecf2..0042090a4d7 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 }; /* -- cgit v1.2.3