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* kmemcheck: add opcode self-testing at bootVegard Nossum2009-06-15
| | | | | | | | | | | | | | We've had some troubles in the past with weird instructions. This patch adds a self-test framework which can be used to verify that a certain set of opcodes are decoded correctly. Of course, the opcodes which are not tested can still give the wrong results. In short, this is just a safeguard to catch unintentional changes in the opcode decoder. It does not mean that errors can't still occur! [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: add hooks for the page allocatorVegard Nossum2009-06-15
| | | | | | | | | | | | | | | This adds support for tracking the initializedness of memory that was allocated with the page allocator. Highmem requests are not tracked. Cc: Dave Hansen <dave@linux.vnet.ibm.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> [build fix for !CONFIG_KMEMCHECK] Signed-off-by: Ingo Molnar <mingo@elte.hu> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: use kmemcheck_pte_lookup() instead of open-coding itPekka Enberg2009-06-15
| | | | | | | | Lets use kmemcheck_pte_lookup() in kmemcheck_fault() instead of open-coding it there. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: move 64-bit ifdef out of kmemcheck_opcode_decode()Pekka Enberg2009-06-15
| | | | | | | | | This patch moves the CONFIG_X86_64 ifdef out of kmemcheck_opcode_decode() by introducing a version of the function that always returns false for CONFIG_X86_32. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: remove multiple ifdef'd definitions of the same global variablePekka Enberg2009-06-15
| | | | | | | | Multiple ifdef'd definitions of the same global variable is ugly and error-prone. Fix that up. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: make initialization message less confusingPekka Enberg2009-06-15
| | | | | | | | The "Bugs, beware!" printout during is cute but confuses users that something bad happened so change the text to the more boring "Initialized" message. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: remove forward declarations from error.cPekka Enberg2009-06-15
| | | | | | | | This patch reorders code in error.c so that we can get rid of the forward declarations. Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
* kmemcheck: include module.h to prevent warningsRandy Dunlap2009-06-13
| | | | | | | | | | | | | | | kmemcheck/shadow.c needs to include <linux/module.h> to prevent the following warnings: linux-next-20080724/arch/x86/mm/kmemcheck/shadow.c:64: warning : data definition has no type or storage class linux-next-20080724/arch/x86/mm/kmemcheck/shadow.c:64: warning : type defaults to 'int' in declaration of 'EXPORT_SYMBOL_GPL' linux-next-20080724/arch/x86/mm/kmemcheck/shadow.c:64: warning : parameter names (without types) in function declaration Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: vegardno@ifi.uio.no Cc: penberg@cs.helsinki.fi Cc: akpm <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* kmemcheck: add the kmemcheck coreVegard Nossum2009-06-13
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>