Commit 67d4a1cd authored May 06, 2020 by Mark Brown Committed by Will Deacon May 07, 2020

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>

parent fa76cfe6

arch/arm64/mm/pageattr.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -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));
		}

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