diff options
| author | Will Deacon <will.deacon@arm.com> | 2018-06-22 10:25:25 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 11:23:08 +0200 |
| commit | 12942d52f23d79df25814730f559c54150ab3e84 (patch) | |
| tree | e613bec135582dd09dd06cc31680d49cb6a977da /arch | |
| parent | 8f27499338a23a9e6eada6ab3a126c0616b21296 (diff) | |
arm64: kpti: Use early_param for kpti= command-line option
commit b5b7dd647f2d21b93f734ce890671cd908e69b0a upstream.
We inspect __kpti_forced early on as part of the cpufeature enable
callback which remaps the swapper page table using non-global entries.
Ensure that __kpti_forced has been updated to reflect the kpti=
command-line option before we start using it.
Fixes: ea1e3de85e94 ("arm64: entry: Add fake CPU feature for unmapping the kernel at EL0")
Cc: <stable@vger.kernel.org> # 4.16.x-
Reported-by: Wei Xu <xuwei5@hisilicon.com>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Tested-by: Wei Xu <xuwei5@hisilicon.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 7959d2c92010..625c2b240ffb 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -826,7 +826,7 @@ static int __init parse_kpti(char *str) __kpti_forced = enabled ? 1 : -1; return 0; } -__setup("kpti=", parse_kpti); +early_param("kpti", parse_kpti); #endif /* CONFIG_UNMAP_KERNEL_AT_EL0 */ static const struct arm64_cpu_capabilities arm64_features[] = { |