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| author | Mark Rutland <mark.rutland@arm.com> | 2018-04-23 11:41:33 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-01-17 19:45:46 +0100 |
| commit | a97fdbf0f25c17b3c296dce6c1f2731cbdb39e7c (patch) | |
| tree | a6874d507e84fffceab4e694ef88230ca5f5a8a3 /arch | |
| parent | 56614548ff01c92cbae9870a462bde24dedaf194 (diff) | |
| download | linux-stable-a97fdbf0f25c17b3c296dce6c1f2731cbdb39e7c.tar.gz linux-stable-a97fdbf0f25c17b3c296dce6c1f2731cbdb39e7c.tar.bz2 linux-stable-a97fdbf0f25c17b3c296dce6c1f2731cbdb39e7c.zip | |
arm64: add sentinel to kpti_safe_list
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@arm.com>
Reported-by: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index 60066315d669..ae28979676c1 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -836,6 +836,7 @@ static bool unmap_kernel_at_el0(const struct arm64_cpu_capabilities *entry, 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; |