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author | Vegard Nossum <vegard.nossum@gmail.com> | 2008-04-04 00:51:41 +0200 |
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committer | Vegard Nossum <vegard.nossum@gmail.com> | 2009-06-13 15:37:30 +0200 |
commit | dfec072ecd35ba6ecad2d51dde325253ac9a2936 (patch) | |
tree | ccf682a631ef8edc0675d68d004bc3a80b34b648 /arch/x86/mm/kmemcheck/pte.c | |
parent | e594c8de3bd4e7732ed3340fb01e18ec94b12df2 (diff) | |
download | op-kernel-dev-dfec072ecd35ba6ecad2d51dde325253ac9a2936.zip op-kernel-dev-dfec072ecd35ba6ecad2d51dde325253ac9a2936.tar.gz |
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 'arch/x86/mm/kmemcheck/pte.c')
-rw-r--r-- | arch/x86/mm/kmemcheck/pte.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/mm/kmemcheck/pte.c b/arch/x86/mm/kmemcheck/pte.c new file mode 100644 index 0000000..4ead26e --- /dev/null +++ b/arch/x86/mm/kmemcheck/pte.c @@ -0,0 +1,22 @@ +#include <linux/mm.h> + +#include <asm/pgtable.h> + +#include "pte.h" + +pte_t *kmemcheck_pte_lookup(unsigned long address) +{ + pte_t *pte; + unsigned int level; + + pte = lookup_address(address, &level); + if (!pte) + return NULL; + if (level != PG_LEVEL_4K) + return NULL; + if (!pte_hidden(*pte)) + return NULL; + + return pte; +} + |