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author | Vincenzo Frascino <vincenzo.frascino@arm.com> | 2020-12-22 21:01:49 +0100 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-22 21:55:07 +0100 |
commit | c746170d6a48b59d1233b375905f7faef6ce80bc (patch) | |
tree | 5443a1ff0d27d931559ae6a68b5eb7953c01a36f /arch | |
parent | arm64: mte: switch GCR_EL1 in kernel entry and exit (diff) | |
download | linux-c746170d6a48b59d1233b375905f7faef6ce80bc.tar.xz linux-c746170d6a48b59d1233b375905f7faef6ce80bc.zip |
kasan, mm: untag page address in free_reserved_area
free_reserved_area() memsets the pages belonging to a given memory area.
As that memory hasn't been allocated via page_alloc, the KASAN tags that
those pages have are 0x00. As the result the memset might result in a tag
mismatch.
Untag the address to avoid spurious faults.
Link: https://lkml.kernel.org/r/ebef6425f4468d063e2f09c1b62ccbb2236b71d3.1606161801.git.andreyknvl@google.com
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
0 files changed, 0 insertions, 0 deletions