arm64: Add support for PR_SPEC_DISABLE_NOEXEC prctl() option

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The PR_SPEC_DISABLE_NOEXEC option to the PR_SPEC_STORE_BYPASS prctl()
allows the SSB mitigation to be enabled only until the next execve(),
at which point the state will revert back to PR_SPEC_ENABLE and the
mitigation will be disabled.

Add support for PR_SPEC_DISABLE_NOEXEC on arm64.

Reported-by: Anthony Steinhauser <asteinhauser@google.com>
Signed-off-by: Will Deacon <will@kernel.org>

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This commit is contained in:

Will Deacon 2020-09-28 14:03:00 +01:00

parent 5c8b0cbd9d

commit 780c083a8f

2 changed files with 40 additions and 4 deletions

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6

arch/arm64/kernel/process.c

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38

arch/arm64/kernel/proton-pack.c

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