linux-kernel - Re: [PATCH] kernel: debug: memcpy overlaped, use memmove instead of memcpy.

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] [day] [month] [year] [list]

Date:	Wed, 17 Apr 2013 17:42:48 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	jason.wessel@...driver.com
CC:	kgdb-bugreport@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kernel: debug: memcpy overlaped, use memmove instead
 of memcpy.

Hello maintainers:

  please help check this patch, when you have time, thanks.


On 2013年04月07日 18:24, Chen Gang wrote:
> 
>   in memcpy, src and dest are overlaped.
>     for default implementaion or some architectures, it is OK.
>     but we can not be sure that it is OK for all platforms.
>     and in this condition, the performance are not quite important.
> 
>   so better to use standard ways: let memmove instead of memcpy.
> 
> Signed-off-by: Chen Gang <gang.chen@...anux.com>
> ---
>  kernel/debug/kdb/kdb_support.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
> index d35cc2d..990b3cc 100644
> --- a/kernel/debug/kdb/kdb_support.c
> +++ b/kernel/debug/kdb/kdb_support.c
> @@ -129,13 +129,13 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
>  		}
>  		if (i >= ARRAY_SIZE(kdb_name_table)) {
>  			debug_kfree(kdb_name_table[0]);
> -			memcpy(kdb_name_table, kdb_name_table+1,
> +			memmove(kdb_name_table, kdb_name_table+1,
>  			       sizeof(kdb_name_table[0]) *
>  			       (ARRAY_SIZE(kdb_name_table)-1));
>  		} else {
>  			debug_kfree(knt1);
>  			knt1 = kdb_name_table[i];
> -			memcpy(kdb_name_table+i, kdb_name_table+i+1,
> +			memmove(kdb_name_table+i, kdb_name_table+i+1,
>  			       sizeof(kdb_name_table[0]) *
>  			       (ARRAY_SIZE(kdb_name_table)-i-1));
>  		}
> 


-- 
Chen Gang

Asianux Corporation
--
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/