linux-kernel - Re: [PATCH] staging: lustre: replace kzalloc with copy_from_user with 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 for Android: free password hash cracker in your pocket

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

Message-ID: <alpine.DEB.2.10.1503311713060.2749@hadrien>
Date:	Tue, 31 Mar 2015 17:15:23 +0200 (CEST)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	"Dhere, Chaitanya (C.)" <cvijaydh@...teon.com>
cc:	"oleg.drokin@...el.com" <oleg.drokin@...el.com>,
	"andreas.dilger@...el.com" <andreas.dilger@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"jinshan.xiong@...el.com" <jinshan.xiong@...el.com>,
	"aybuke.147@...il.com" <aybuke.147@...il.com>,
	"john.hammond@...el.com" <john.hammond@...el.com>,
	"Julia.Lawall@...6.fr" <Julia.Lawall@...6.fr>,
	"HPDD-discuss@...ts.01.org" <HPDD-discuss@...1.01.org>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: lustre: replace kzalloc with copy_from_user
 with memdup_user

On Tue, 31 Mar 2015, Dhere, Chaitanya (C.) wrote:

> This patch replaces kzalloc and copy_from_user with memdup_user call
> This change was detected with coccinelle tool
>
> Signed-off-by: Chaitanya Dhere <cvijaydh@...teon.com>
> ---
>  drivers/staging/lustre/lustre/llite/file.c |   11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/staging/lustre/lustre/llite/file.c b/drivers/staging/lustre/lustre/llite/file.c
> index 85e74d1..85b5567 100644
> --- a/drivers/staging/lustre/lustre/llite/file.c
> +++ b/drivers/staging/lustre/lustre/llite/file.c
> @@ -2368,14 +2368,9 @@ ll_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
>  		struct hsm_state_set	*hss;
>  		int			 rc;
>
> -		hss = kzalloc(sizeof(*hss), GFP_NOFS);
> -		if (!hss)
> -			return -ENOMEM;
> -
> -		if (copy_from_user(hss, (char *)arg, sizeof(*hss))) {
> -			OBD_FREE_PTR(hss);
> -			return -EFAULT;
> -		}
> +		hss = memdup_user((char *)arg, sizeof(*hss));

memdup_user will use the flag GFP_KERNEL, ie (__GFP_WAIT | __GFP_IO |
__GFP_FS), rather than the flag GFP_NOFS, ie (__GFP_WAIT | __GFP_IO), that
is specified.  I don't know if this is a problem here.

julia

> +		if (IS_ERR(hss))
> +			return PTR_ERR(hss);
>
>  		rc = ll_hsm_state_set(inode, hss);
>
> --
> 1.7.9.5
>
--
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/