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(parent: 6d37d81) | patch
arm64: efi: Restore register x18 if it was corrupted
authorSami Tolvanen <samitolvanen@google.com>
Mon, 27 Apr 2020 16:00:13 +0000 (09:00 -0700)
committerWill Deacon <will@kernel.org>
Fri, 15 May 2020 15:35:50 +0000 (16:35 +0100)
commite73f02c6eb15729164b9dd5e19214b54446823ab
treef232209ca98fd126e697706422af3d044a7ce24etree | snapshot
parent6d37d81f449a103a8b43c5c972b5055b8936ef0ecommit | diff
arm64: efi: Restore register x18 if it was corrupted

If we detect a corrupted x18, restore the register before jumping back
to potentially SCS instrumented code. This is safe, because the wrapper
is called with preemption disabled and a separate shadow stack is used
for interrupt handling.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Will Deacon <will@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>
arch/arm64/kernel/efi-rt-wrapper.S diff | blob | history
ep93xx device tree rework repo: git://git.maquefel.me/linux.git