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arm64: mm: Mark executable text as guarded pages 

When the kernel is built for BTI and running on a system which supports
make all executable text guarded pages to ensure that loadable module
and JITed BPF code is protected by BTI.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20200506195138.22086-7-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2020-05-06 20:51:33 +01:00 committed by Will Deacon
parent fa76cfe65c
commit 67d4a1cd09
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/mm/pageattr.c
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@ -126,13 +126,13 @@ int set_memory_nx(unsigned long addr, int numpages)
{
return change_memory_common(addr, numpages,
__pgprot(PTE_PXN),
__pgprot(0));
__pgprot(PTE_MAYBE_GP));
}
int set_memory_x(unsigned long addr, int numpages)
{
return change_memory_common(addr, numpages,
__pgprot(0),
__pgprot(PTE_MAYBE_GP),
__pgprot(PTE_PXN));
}