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authorJosh Poimboeuf <jpoimboe@redhat.com>2017-11-03 07:58:54 -0500
committerIngo Molnar <mingo@kernel.org>2017-11-05 09:52:16 +0100
commiteda9cec4c9a12208a6f69fbe68f72a6311d50032 (patch)
tree36d9d40657db3ee47c3c38f9d255b6e763539628 /include/linux/mpage.h
parent675357362aeba19688440eb1aaa7991067f73b12 (diff)
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x86/module: Detect and skip invalid relocations
There have been some cases where external tooling (e.g., kpatch-build) creates a corrupt relocation which targets the wrong address. This is a silent failure which can corrupt memory in unexpected places. On x86, the bytes of data being overwritten by relocations are always initialized to zero beforehand. Use that knowledge to add sanity checks to detect such cases before they corrupt memory. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: jeyu@kernel.org Cc: live-patching@vger.kernel.org Link: http://lkml.kernel.org/r/37450d6c6225e54db107fba447ce9e56e5f758e9.1509713553.git.jpoimboe@redhat.com [ Restructured the messages, as it's unclear whether the relocation or the target is corrupted. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/mpage.h')
0 files changed, 0 insertions, 0 deletions
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