linux-kernel - Re: [PATCH 5/27] mm: Use memdup

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:	Mon, 24 May 2010 10:04:10 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Julia Lawall <julia@...u.dk>
Cc:	kosaki.motohiro@...fujitsu.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 5/27] mm: Use memdup_user

> Signed-off-by: Julia Lawall <julia@...u.dk>
> 
> ---
>  mm/util.c |   11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/mm/util.c b/mm/util.c
> index f5712e8..4735ea4 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -225,15 +225,10 @@ char *strndup_user(const char __user *s, long n)
>  	if (length > n)
>  		return ERR_PTR(-EINVAL);
>  
> -	p = kmalloc(length, GFP_KERNEL);
> +	p = memdup_user(s, length);

memdup? Why can't we use strnlen_user() and legitimate length copy?


>  
> -	if (!p)
> -		return ERR_PTR(-ENOMEM);
> -
> -	if (copy_from_user(p, s, length)) {
> -		kfree(p);
> -		return ERR_PTR(-EFAULT);
> -	}
> +	if (IS_ERR(p))
> +		return p;
>  
>  	p[length - 1] = '\0';
>  
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@...ck.org.  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>



--
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/