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| author | Will Deacon <will@kernel.org> | 2020-06-15 18:27:43 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2020-06-16 19:21:07 +0300 |
| commit | 034aa9cd698e315c767af1bac3fd1ff8898d2cd7 (patch) | |
| tree | 6529aff9bc5aa4384b5a091ebef6364c7f56332b /arch | |
| parent | 8dd4daa04278d7437641962ed53b843c0b0ec4a9 (diff) | |
| download | linux-034aa9cd698e315c767af1bac3fd1ff8898d2cd7.tar.xz | |
arm64: pgtable: Clear the GP bit for non-executable kernel pages
Commit cca98e9f8b5e ("mm: enforce that vmap can't map pages executable")
introduced 'pgprot_nx(prot)' for arm64 but collided silently with the
BTI support during the merge window, which endeavours to clear the GP
bit for non-executable kernel mappings in set_memory_nx().
For consistency between the two APIs, clear the GP bit in pgprot_nx().
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20200615154642.3579-1-will@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/pgtable.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 6dbd267ab931..758e2d1577d0 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -416,7 +416,7 @@ static inline pmd_t pmd_mkdevmap(pmd_t pmd) __pgprot((pgprot_val(prot) & ~(mask)) | (bits)) #define pgprot_nx(prot) \ - __pgprot_modify(prot, 0, PTE_PXN) + __pgprot_modify(prot, PTE_MAYBE_GP, PTE_PXN) /* * Mark the prot value as uncacheable and unbufferable. |