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From: Steven Rostedt <rostedt@goodmis.org>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: <arnd@arndb.de>, <linux-arch@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <linuxppc-dev@lists.ozlabs.org>,
	<mingo@redhat.com>, <davem@davemloft.net>, <ast@kernel.org>,
	<ryabinin.a.a@gmail.com>, <mpe@ellerman.id.au>,
	<benh@kernel.crashing.org>, <paulus@samba.org>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Petr Mladek <pmladek@suse.com>,
	"Sergey Senozhatsky" <senozhatsky@chromium.org>
Subject: Re: [PATCH v2 2/7] kallsyms: Fix address-checks for kernel related range
Date: Wed, 28 Jul 2021 10:46:42 -0400	[thread overview]
Message-ID: <20210728104642.7ae75442@oasis.local.home> (raw)
In-Reply-To: <20210728081320.20394-3-wangkefeng.wang@huawei.com>

On Wed, 28 Jul 2021 16:13:15 +0800
Kefeng Wang <wangkefeng.wang@huawei.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@arndb.de>
> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
> Cc: Petr Mladek <pmladek@suse.com>
> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.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);
>  }


  reply	other threads:[~2021-07-28 14:46 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-28  8:13 [PATCH v2 0/7] sections: Unify kernel sections range check and use Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 1/7] kallsyms: Remove arch specific text and data check Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 2/7] kallsyms: Fix address-checks for kernel related range Kefeng Wang
2021-07-28 14:46   ` Steven Rostedt [this message]
2021-07-29  2:03     ` Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 3/7] sections: Move and rename core_kernel_data() to is_kernel_core_data() Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 4/7] sections: Move is_kernel_inittext() into sections.h Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 5/7] kallsyms: Rename is_kernel() and is_kernel_text() Kefeng Wang
2021-07-28 15:28   ` Steven Rostedt
2021-07-29  2:00     ` Kefeng Wang
2021-07-29  4:05       ` Steven Rostedt
2021-07-29 11:06         ` Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 6/7] sections: Add new " Kefeng Wang
2021-07-28 15:32   ` Steven Rostedt
2021-07-29  2:02     ` Kefeng Wang
2021-07-28  8:13 ` [PATCH v2 7/7] powerpc/mm: Use is_kernel_text() and is_kernel_inittext() helper Kefeng Wang

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