arm64: Turn on KPTI only on CPUs that need it

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Commit 0ba2e29c7f upstream.

Whitelist Broadcom Vulcan/Cavium ThunderX2 processors in
unmap_kernel_at_el0(). These CPUs are not vulnerable to
CVE-2017-5754 and do not need KPTI when KASLR is off.

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Jayachandran C 2018-01-19 04:22:48 -08:00 • committed by Greg Kroah-Hartman

parent cb132ae43a

commit 56e4bdb0a3

1 changed files with 7 additions and 0 deletions

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arch/arm64/kernel/cpufeature.c

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