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From:   Anup Patel <anup@brainfault.org>
Date:   Fri, 2 Apr 2021 09:41:00 +0530
Message-ID: <CAAhSdy3-n7ASkPXN=UsQW72gY5JH-J3Rf7W6kfUxXV6Zdb5hDg@mail.gmail.com>
Subject: Re: [PATCH v2 3/9] riscv: Constify sys_call_table
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>,
        Andrey Ryabinin <ryabinin.a.a@gmail.com>,
        Alexander Potapenko <glider@google.com>,
        Andrey Konovalov <andreyknvl@gmail.com>,
        Dmitry Vyukov <dvyukov@google.com>,
        =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@kernel.org>,
        Alexei Starovoitov <ast@kernel.org>,
        Daniel Borkmann <daniel@iogearbox.net>,
        Andrii Nakryiko <andrii@kernel.org>,
        Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
        John Fastabend <john.fastabend@gmail.com>,
        KP Singh <kpsingh@kernel.org>,
        Luke Nelson <luke.r.nels@gmail.com>,
        Xi Wang <xi.wang@gmail.com>,
        linux-riscv <linux-riscv@lists.infradead.org>,
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On Wed, Mar 31, 2021 at 10:01 PM Jisheng Zhang
<jszhang3@mail.ustc.edu.cn> wrote:
>
> From: Jisheng Zhang <jszhang@kernel.org>
>
> Constify the sys_call_table so that it will be placed in the .rodata
> section. This will cause attempts to modify the table to fail when
> strict page permissions are in place.
>
> Signed-off-by: Jisheng Zhang <jszhang@kernel.org>

Looks good to me.

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

Regards,
Anup

> ---
>  arch/riscv/include/asm/syscall.h  | 2 +-
>  arch/riscv/kernel/syscall_table.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/riscv/include/asm/syscall.h b/arch/riscv/include/asm/syscall.h
> index 49350c8bd7b0..b933b1583c9f 100644
> --- a/arch/riscv/include/asm/syscall.h
> +++ b/arch/riscv/include/asm/syscall.h
> @@ -15,7 +15,7 @@
>  #include <linux/err.h>
>
>  /* The array of function pointers for syscalls. */
> -extern void *sys_call_table[];
> +extern void * const sys_call_table[];
>
>  /*
>   * Only the low 32 bits of orig_r0 are meaningful, so we return int.
> diff --git a/arch/riscv/kernel/syscall_table.c b/arch/riscv/kernel/syscall_table.c
> index f1ead9df96ca..a63c667c27b3 100644
> --- a/arch/riscv/kernel/syscall_table.c
> +++ b/arch/riscv/kernel/syscall_table.c
> @@ -13,7 +13,7 @@
>  #undef __SYSCALL
>  #define __SYSCALL(nr, call)    [nr] = (call),
>
> -void *sys_call_table[__NR_syscalls] = {
> +void * const sys_call_table[__NR_syscalls] = {
>         [0 ... __NR_syscalls - 1] = sys_ni_syscall,
>  #include <asm/unistd.h>
>  };
> --
> 2.31.0
>
>
>
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