linux-kernel - Re: [PATCH] riscv: mm: implement pgprot

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Date: Mon, 15 Jan 2024 10:58:10 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Jisheng Zhang <jszhang@...nel.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] riscv: mm: implement pgprot_nx

On 21/11/2023 17:06, Jisheng Zhang wrote:
> commit cca98e9f8b5e ("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@...nel.org>
> ---
>   arch/riscv/include/asm/pgtable.h | 6 ++++++
>   1 file changed, 6 insertions(+)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 294044429e8e..4fc6ee5226fb 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -608,6 +608,12 @@ 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)
>   {


This one looks good too:

Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>

Thanks,

Alex