linux-kernel - Re: [PATCH v2 5/9] riscv: kprobes: Implement alloc_insn_page()

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Date:   Fri, 2 Apr 2021 09:46:24 +0530
From:   Anup Patel <anup@...infault.org>
To:     Jisheng Zhang <jszhang3@...l.ustc.edu.cn>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Björn Töpel <bjorn@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Luke Nelson <luke.r.nels@...il.com>,
        Xi Wang <xi.wang@...il.com>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org List" <linux-kernel@...r.kernel.org>,
        kasan-dev@...glegroups.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2 5/9] riscv: kprobes: Implement alloc_insn_page()

On Wed, Mar 31, 2021 at 10:02 PM Jisheng Zhang
<jszhang3@...l.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@...nel.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@...nel.org>

Looks good to me.

Reviewed-by: Anup Patel <anup@...infault.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
>
>
>
> _______________________________________________
> linux-riscv mailing list
> linux-riscv@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-riscv

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