linux-kernel - Re: [PATCH 2/2] check if crashk_res_low exists when exclude it from crash mem ranges

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 12 Aug 2014 17:02:53 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Baoquan He <bhe@...hat.com>
Cc:	linux-kernel@...r.kernel.org, ebiederm@...ssion.com, hpa@...or.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 2/2] check if crashk_res_low exists when exclude it from
 crash mem ranges

On Tue, Aug 12, 2014 at 01:29:28PM +0800, Baoquan He wrote:
> Add a check if crashk_res_low exists just like GART region does. If
> crashk_res_low doesn't exist, calling exclude_mem_range is unnecessary.
> 
> Meanwhile, since crashk_res_low has been initialized at definition, it's
> safe just use "if (crashk_low_res.end)" to check if it's exist. And this
> can make it consistent with other places of check.
> 
> Signed-off-by: Baoquan He <bhe@...hat.com>

This patch looks good.

Acked-by: Vivek Goyal <vgoyal@...hat.com>

Vivek

> ---
>  arch/x86/kernel/crash.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
> index 0553a34..c9e83f9 100644
> --- a/arch/x86/kernel/crash.c
> +++ b/arch/x86/kernel/crash.c
> @@ -238,7 +238,7 @@ static void fill_up_crash_elf_data(struct crash_elf_data *ced,
>  	ced->max_nr_ranges++;
>  
>  	/* If crashk_low_res is not 0, another range split possible */
> -	if (crashk_low_res.end != 0)
> +	if (crashk_low_res.end)
>  		ced->max_nr_ranges++;
>  }
>  
> @@ -336,9 +336,11 @@ static int elf_header_exclude_ranges(struct crash_elf_data *ced,
>  	if (ret)
>  		return ret;
>  
> -	ret = exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end);
> -	if (ret)
> -		return ret;
> +	if (crashk_low_res.end) {
> +		ret = exclude_mem_range(cmem, crashk_low_res.start, crashk_low_res.end);
> +		if (ret)
> +			return ret;
> +	}
>  
>  	/* Exclude GART region */
>  	if (ced->gart_end) {
> -- 
> 1.8.5.3
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/