linux-kernel - Re: [PATCH v2 2/7] kallsyms: Fix address-checks for kernel related range

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Date:   Wed, 28 Jul 2021 10:46:42 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     <arnd@...db.de>, <linux-arch@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <mingo@...hat.com>, <davem@...emloft.net>, <ast@...nel.org>,
        <ryabinin.a.a@...il.com>, <mpe@...erman.id.au>,
        <benh@...nel.crashing.org>, <paulus@...ba.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        "Sergey Senozhatsky" <senozhatsky@...omium.org>
Subject: Re: [PATCH v2 2/7] kallsyms: Fix address-checks for kernel related
 range

On Wed, 28 Jul 2021 16:13:15 +0800
Kefeng Wang <wangkefeng.wang@...wei.com> wrote:

> The is_kernel_inittext/is_kernel_text/is_kernel function should not
> include the end address(the labels _einittext, _etext and _end) when
> check the address range, the issue exists since Linux v2.6.12.
> 
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> Cc: Petr Mladek <pmladek@...e.com>
> Acked-by: Sergey Senozhatsky <senozhatsky@...omium.org>
> Reviewed-by: Petr Mladek <pmladek@...e.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve

> ---
>  include/linux/kallsyms.h | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
> index 2a241e3f063f..b016c62f30a6 100644
> --- a/include/linux/kallsyms.h
> +++ b/include/linux/kallsyms.h
> @@ -27,21 +27,21 @@ struct module;
>  static inline int is_kernel_inittext(unsigned long addr)
>  {
>  	if (addr >= (unsigned long)_sinittext
> -	    && addr <= (unsigned long)_einittext)
> +	    && addr < (unsigned long)_einittext)
>  		return 1;
>  	return 0;
>  }
>  
>  static inline int is_kernel_text(unsigned long addr)
>  {
> -	if ((addr >= (unsigned long)_stext && addr <= (unsigned long)_etext))
> +	if ((addr >= (unsigned long)_stext && addr < (unsigned long)_etext))
>  		return 1;
>  	return in_gate_area_no_mm(addr);
>  }
>  
>  static inline int is_kernel(unsigned long addr)
>  {
> -	if (addr >= (unsigned long)_stext && addr <= (unsigned long)_end)
> +	if (addr >= (unsigned long)_stext && addr < (unsigned long)_end)
>  		return 1;
>  	return in_gate_area_no_mm(addr);
>  }