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From:   Anup Patel <anup@brainfault.org>
Date:   Fri, 2 Apr 2021 09:46:24 +0530
Message-ID: <CAAhSdy1qcNBy-o8NAho-bhJY1FOF_DCiQ37XX+FEiBbYqokxhA@mail.gmail.com>
Subject: Re: [PATCH v2 5/9] riscv: kprobes: Implement alloc_insn_page()
To:     Jisheng Zhang <jszhang3@mail.ustc.edu.cn>
Cc:     Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
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On Wed, Mar 31, 2021 at 10:02 PM Jisheng Zhang
<jszhang3@mail.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@kernel.org>
>
> Allocate PAGE_KERNEL_READ_EXEC(read only, executable) page for kprobes
> insn page. This is to prepare for STRICT_MODULE_RWX.
>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>

Looks good to me.

Reviewed-by: Anup Patel <anup@brainfault.org>

Regards,
Anup

> ---
>  arch/riscv/kernel/probes/kprobes.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
> index 7e2c78e2ca6b..8c1f7a30aeed 100644
> --- a/arch/riscv/kernel/probes/kprobes.c
> +++ b/arch/riscv/kernel/probes/kprobes.c
> @@ -84,6 +84,14 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
>         return 0;
>  }
>
> +void *alloc_insn_page(void)
> +{
> +       return  __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
> +                                    GFP_KERNEL, PAGE_KERNEL_READ_EXEC,
> +                                    VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
> +                                    __builtin_return_address(0));
> +}
> +
>  /* install breakpoint in text */
>  void __kprobes arch_arm_kprobe(struct kprobe *p)
>  {
> --
> 2.31.0
>
>
>
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