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Subject[PATCH 4.15 058/202] [Variant 2/Spectre-v2] arm64: cpufeature: __this_cpu_has_cap() shouldnt stop early
Date
4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Morse <james.morse@arm.com>


Commit edf298cfce47 upstream.

this_cpu_has_cap() tests caps->desc not caps->matches, so it stops
walking the list when it finds a 'silent' feature, instead of
walking to the end of the list.

Prior to v4.6's 644c2ae198412 ("arm64: cpufeature: Test 'matches' pointer
to find the end of the list") we always tested desc to find the end of
a capability list. This was changed for dubious things like PAN_NOT_UAO.
v4.7's e3661b128e53e ("arm64: Allow a capability to be checked on
single CPU") added this_cpu_has_cap() using the old desc style test.

CC: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: James Morse <james.morse@arm.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>
---
arch/arm64/kernel/cpufeature.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -1173,9 +1173,8 @@ static bool __this_cpu_has_cap(const str
if (WARN_ON(preemptible()))
return false;

- for (caps = cap_array; caps->desc; caps++)
+ for (caps = cap_array; caps->matches; caps++)
if (caps->capability == cap &&
- caps->matches &&
caps->matches(caps, SCOPE_LOCAL_CPU))
return true;
return false;

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