s390/kasan: fix insecure W+X mapping warning

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[ Upstream commit 2ed8b50975 ]

Since commit 3b5c3f000c2e ("s390/kasan: move shadow mapping
to decompressor") the decompressor establishes mappings for
the shadow memory and sets initial protection attributes to
RWX. The decompressed kernel resets protection to RW+NX
later on.

In case a shadow memory range is not aligned on page boundary
(e.g. as result of mem= kernel command line parameter use),
the "Checked W+X mappings: FAILED, 1 W+X pages found" warning
hits.

Reported-by: Vasily Gorbik <gor@linux.ibm.com>
Fixes: 557b19709d ("s390/kasan: move shadow mapping to decompressor")
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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This commit is contained in:

Alexander Gordeev 2023-05-26 14:30:29 +02:00 • committed by Greg Kroah-Hartman

parent b953ddcbb1

commit 79769887fd

1 changed files with 10 additions and 4 deletions

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arch/s390/mm/vmem.c

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