[PATCH 4.14 32/71] arm64: add sentinel to kpti_safe_list

[Greg Kroah-Hartman]

From: Mark Rutland <mark.rutland@xxxxxxx>

commit 71c751f2a43fa03fae3cf5f0067ed3001a397013 upstream.

We're missing a sentinel entry in kpti_safe_list. Thus is_midr_in_range_list()
can walk past the end of kpti_safe_list. Depending on the contents of memory,
this could erroneously match a CPU's MIDR, cause a data abort, or other bad
outcomes.

Add the sentinel entry to avoid this.

Fixes: be5b299830c63ed7 ("arm64: capabilities: Add support for checks based on a list of MIDRs")
Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Reported-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Tested-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Juerg Haefliger <juergh@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/arm64/kernel/cpufeature.c |    1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -836,6 +836,7 @@ static bool unmap_kernel_at_el0(const st
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A57),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A72),
 		MIDR_ALL_VERSIONS(MIDR_CORTEX_A73),
+		{ /* sentinel */ }
 	};
 	char const *str = "kpti command line option";
 	bool meltdown_safe;