We certainly want this:
commit 71c751f2a43fa03fae3cf5f0067ed3001a397013
Author: Mark Rutland <[email protected]>
Date: Mon Apr 23 11:41:33 2018 +0100
arm64: add sentinel to kpti_safe_list
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 <[email protected]>
Reported-by: Jan Kiszka <[email protected]>
Tested-by: Jan Kiszka <[email protected]>
Reviewed-by: Suzuki K Poulose <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Suzuki K Poulose <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 536d572e5596..9d1b06d67c53 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -868,6 +868,7 @@ static bool unmap_kernel_at_el0(const struct
arm64_cpu_capabilities *entry,
static const struct midr_range kpti_safe_list[] = {
MIDR_ALL_VERSIONS(MIDR_CAVIUM_THUNDERX2),
MIDR_ALL_VERSIONS(MIDR_BRCM_VULCAN),
+ { /* sentinel */ }
};
char const *str = "command line option";
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https://bugs.launchpad.net/bugs/1857074
Title:
Cavium ThunderX CN88XX Panic : Unknown reason
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