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https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
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| Filename | Latest commit message | Latest commit date |
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c78abaa8feOriginally the addr != NULL check was meant to take care of the case where __kfence_pool == NULL (KFENCE is disabled). However, this does not work for addresses where addr > 0 && addr < KFENCE_POOL_SIZE. This can be the case on NULL-deref where addr > 0 && addr < PAGE_SIZE or any other faulting access with addr < KFENCE_POOL_SIZE. While the kernel would likely crash, the stack traces and report might be confusing due to double faults upon KFENCE's attempt to unprotect such an address. Fix it by just checking that __kfence_pool != NULL instead. Link: https://lkml.kernel.org/r/20210818130300.2482437-1-elver@google.com Fixes: 0ce20dd84089 ("mm: add Kernel Electric-Fence infrastructure") Signed-off-by: Marco Elver <elver@google.com> Reported-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> Acked-by: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: <stable@vger.kernel.org> [5.12+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> (cherry picked from commit a7cb5d23eaea148f8582229846f8dfff192f05c3) Bug: 196937223 Bug: 197197917 Test: local QEMU runs with init/main.c modified to access the NULL page Signed-off-by: Alexander Potapenko <glider@google.com> Change-Id: I6a339e8c6b4d2bdc3ee9bd575725489a8233aade (cherry picked from commit 228d32e2d0b730f00eb0a8950698902b3ad23daf) |
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