linux-kernel - Re: [PATCH 2.6.23-rc1] eCryptfs: fix error handling in ecryptfs

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

Message-ID: <20070802135642.GH30416@halcrow.austin.ibm.com>
Date:	Thu, 2 Aug 2007 08:56:43 -0500
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	ecryptfs-devel@...ts.sourceforge.net, moriai.satoshi@....ntt.co.jp,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.23-rc1] eCryptfs: fix error handling in ecryptfs_init

On Thu, Aug 02, 2007 at 10:06:19PM +0900, Ryusuke Konishi wrote:
> ecryptfs_init() exits without doing any cleanup jobs if
> ecryptfs_init_messaging() fails.  In that case, eCryptfs leaves
> sysfs entries, leaks memory, and causes an invalid page fault.
> This patch fixes the problem.
> 
> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>

Acked-by: Michael Halcrow <mhalcrow@...ibm.com>

> ---
>  fs/ecryptfs/main.c |   18 +++++++++++++-----
>  1 files changed, 13 insertions(+), 5 deletions(-)
> 
> diff --git a/fs/ecryptfs/main.c b/fs/ecryptfs/main.c
> index e557a67..a984972 100644
> --- a/fs/ecryptfs/main.c
> +++ b/fs/ecryptfs/main.c
> @@ -813,6 +813,15 @@ out:
>  	return rc;
>  }
> 
> +static void do_sysfs_unregistration(void)
> +{
> +	sysfs_remove_file(&ecryptfs_subsys.kobj,
> +			  &sysfs_attr_version.attr);
> +	sysfs_remove_file(&ecryptfs_subsys.kobj,
> +			  &sysfs_attr_version_str.attr);
> +	subsystem_unregister(&ecryptfs_subsys);
> +}
> +
>  static int __init ecryptfs_init(void)
>  {
>  	int rc;
> @@ -851,6 +860,9 @@ static int __init ecryptfs_init(void)
>  	if (rc) {
>  		ecryptfs_printk(KERN_ERR, "Failure occured while attempting to "
>  				"initialize the eCryptfs netlink socket\n");
> +		do_sysfs_unregistration();
> +		unregister_filesystem(&ecryptfs_fs_type);
> +		ecryptfs_free_kmem_caches();
>  	}
>  out:
>  	return rc;
> @@ -858,11 +870,7 @@ out:
> 
>  static void __exit ecryptfs_exit(void)
>  {
> -	sysfs_remove_file(&ecryptfs_subsys.kobj,
> -			  &sysfs_attr_version.attr);
> -	sysfs_remove_file(&ecryptfs_subsys.kobj,
> -			  &sysfs_attr_version_str.attr);
> -	subsystem_unregister(&ecryptfs_subsys);
> +	do_sysfs_unregistration();
>  	ecryptfs_release_messaging(ecryptfs_transport);
>  	unregister_filesystem(&ecryptfs_fs_type);
>  	ecryptfs_free_kmem_caches();
-
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/