riscv: mm: implement pgprot_nx
commit cca98e9f8b
("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: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Tested-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20231121160637.3856-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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@ -593,6 +593,12 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
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return ptep_test_and_clear_young(vma, address, ptep);
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}
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#define pgprot_nx pgprot_nx
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static inline pgprot_t pgprot_nx(pgprot_t _prot)
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{
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return __pgprot(pgprot_val(_prot) & ~_PAGE_EXEC);
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}
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#define pgprot_noncached pgprot_noncached
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static inline pgprot_t pgprot_noncached(pgprot_t _prot)
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{
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