Unverified Commit 0ffe1ae7 authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Palmer Dabbelt
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riscv: mm: implement pgprot_nx 



commit cca98e9f ("mm: enforce that vmap can't map pages
executable") enforces the W^X protection by not allowing remapping
existing pages as executable. Add riscv bits so that riscv can benefit
the same protection.

Signed-off-by: default avatarJisheng Zhang <jszhang@kernel.org>
Reviewed-by: default avatarSamuel Holland <samuel.holland@sifive.com>
Tested-by: default avatarSamuel Holland <samuel.holland@sifive.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarAlexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20231121160637.3856-1-jszhang@kernel.org


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 7115ff4a

arch/riscv/include/asm/pgtable.h

+6 −0
Original line number Diff line number Diff line
@@ -593,6 +593,12 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, 
	return ptep_test_and_clear_young(vma, address, ptep);

}



#define pgprot_nx pgprot_nx

static inline pgprot_t pgprot_nx(pgprot_t _prot)

{

	return __pgprot(pgprot_val(_prot) & ~_PAGE_EXEC);

}



#define pgprot_noncached pgprot_noncached

static inline pgprot_t pgprot_noncached(pgprot_t _prot)

{