linux-kernel - Re: [PATCH v11 07/27] riscv mm: manufacture shadow stack pte

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Message-ID: <CANXhq0pAwwcKW_0Pxj_M5rtdGwuhrCO1=428y2aHgRBc60N2eQ@mail.gmail.com>
Date: Fri, 14 Mar 2025 16:29:07 +0800
From: Zong Li <zong.li@...ive.com>
To: Deepak Gupta <debug@...osinc.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
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Subject: Re: [PATCH v11 07/27] riscv mm: manufacture shadow stack pte

On Mon, Mar 10, 2025 at 11:42 PM Deepak Gupta <debug@...osinc.com> wrote:
>
> This patch implements creating shadow stack pte (on riscv). Creating
> shadow stack PTE on riscv means that clearing RWX and then setting W=1.
>
> Signed-off-by: Deepak Gupta <debug@...osinc.com>
> Reviewed-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>  arch/riscv/include/asm/pgtable.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h
> index 8c528cd7347a..ede43185ffdf 100644
> --- a/arch/riscv/include/asm/pgtable.h
> +++ b/arch/riscv/include/asm/pgtable.h
> @@ -421,6 +421,11 @@ static inline pte_t pte_mkwrite_novma(pte_t pte)
>         return __pte(pte_val(pte) | _PAGE_WRITE);
>  }
>
> +static inline pte_t pte_mkwrite_shstk(pte_t pte)
> +{
> +       return __pte((pte_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE);
> +}
> +
>  /* static inline pte_t pte_mkexec(pte_t pte) */
>
>  static inline pte_t pte_mkdirty(pte_t pte)
> @@ -749,6 +754,11 @@ static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
>         return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd)));
>  }
>
> +static inline pmd_t pmd_mkwrite_shstk(pmd_t pte)
> +{
> +       return __pmd((pmd_val(pte) & ~(_PAGE_LEAF)) | _PAGE_WRITE);
> +}
> +
>  static inline pmd_t pmd_wrprotect(pmd_t pmd)
>  {
>         return pte_pmd(pte_wrprotect(pmd_pte(pmd)));
>

LGTM.

Reviewed-by: Zong Li <zong.li@...ive.com>

> --
> 2.34.1
>
>
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