linux-kernel - Re: [PATCH] SELinux: re. BUG memory leakage at ./security/selinux/hooks.c

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]

Message-Id: <1249907047.2422.31.camel@moss-pluto.epoch.ncsc.mil>
Date:	Mon, 10 Aug 2009 08:24:07 -0400
From:	Stephen Smalley <sds@...ho.nsa.gov>
To:	James Morris <jmorris@...ei.org>
Cc:	iceberg <strakh@...ras.ru>, linux-kernel@...r.kernel.org,
	selinux@...ho.nsa.gov, Eric Paris <eparis@...hat.com>
Subject: Re: [PATCH] SELinux: re. BUG memory leakage at
 ./security/selinux/hooks.c

On Mon, 2009-08-10 at 22:17 +1000, James Morris wrote:
> Please review.
> 
> Author: James Morris <jmorris@...ei.org>
> Date:   Mon Aug 10 22:00:13 2009 +1000
> 
>     SELinux: fix memory leakage in /security/selinux/hooks.c
>     
>     Fix memory leakage in /security/selinux/hooks.c
>     
>     The buffer always needs to be freed here; we either error
>     out or allocate more memory.
>     
>     Reported-by: iceberg <strakh@...ras.ru>
>     Signed-off-by: James Morris <jmorris@...ei.org>

Acked-by:  Stephen Smalley <sds@...ho.nsa.gov>

> 
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 15c2a08..1e8cfc4 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -1285,6 +1285,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
>  		rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
>  					   context, len);
>  		if (rc == -ERANGE) {
> +			kfree(context);
> +
>  			/* Need a larger buffer.  Query for the right size. */
>  			rc = inode->i_op->getxattr(dentry, XATTR_NAME_SELINUX,
>  						   NULL, 0);
> @@ -1292,7 +1294,6 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
>  				dput(dentry);
>  				goto out_unlock;
>  			}
> -			kfree(context);
>  			len = rc;
>  			context = kmalloc(len+1, GFP_NOFS);
>  			if (!context) {
> 
-- 
Stephen Smalley
National Security Agency

--
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/