linux-kernel - Re: [PATCH 5/5] pstore: selinux: add security in-core xattr support for pstore and debugfs

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Date:	Wed, 14 Jan 2015 10:49:45 -0500
From:	Stephen Smalley <stephen.smalley@...il.com>
To:	Mark Salyzyn <salyzyn@...roid.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Paul Moore <paul@...l-moore.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Eric Paris <eparis@...isplace.org>,
	James Morris <james.l.morris@...cle.com>,
	"Serge E. Hallyn" <serge@...lyn.com>,
	selinux <selinux@...ho.nsa.gov>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH 5/5] pstore: selinux: add security in-core xattr support
 for pstore and debugfs

On Tue, Jan 13, 2015 at 5:33 PM, Mark Salyzyn <salyzyn@...roid.com> wrote:
> - add "pstore" and "debugfs" to list of in-core exceptions
> - change fstype checks to boolean equation
> - change from strncmp to strcmp for checking
>
> Signed-off-by: Mark Salyzyn <salyzyn@...roid.com>

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

> ---
>  security/selinux/hooks.c | 25 ++++++++-----------------
>  1 file changed, 8 insertions(+), 17 deletions(-)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 6da7532..789a7e1 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -401,23 +401,14 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
>  {
>         struct superblock_security_struct *sbsec = sb->s_security;
>
> -       if (sbsec->behavior == SECURITY_FS_USE_XATTR ||
> -           sbsec->behavior == SECURITY_FS_USE_TRANS ||
> -           sbsec->behavior == SECURITY_FS_USE_TASK)
> -               return 1;
> -
> -       /* Special handling for sysfs. Is genfs but also has setxattr handler*/
> -       if (strncmp(sb->s_type->name, "sysfs", sizeof("sysfs")) == 0)
> -               return 1;
> -
> -       /*
> -        * Special handling for rootfs. Is genfs but supports
> -        * setting SELinux context on in-core inodes.
> -        */
> -       if (strncmp(sb->s_type->name, "rootfs", sizeof("rootfs")) == 0)
> -               return 1;
> -
> -       return 0;
> +       return sbsec->behavior == SECURITY_FS_USE_XATTR ||
> +               sbsec->behavior == SECURITY_FS_USE_TRANS ||
> +               sbsec->behavior == SECURITY_FS_USE_TASK ||
> +               /* Special handling. Genfs but also in-core setxattr handler */
> +               !strcmp(sb->s_type->name, "sysfs") ||
> +               !strcmp(sb->s_type->name, "pstore") ||
> +               !strcmp(sb->s_type->name, "debugfs") ||
> +               !strcmp(sb->s_type->name, "rootfs");
>  }
>
>  static int sb_finish_set_opts(struct super_block *sb)
> --
> 2.2.0.rc0.207.ga3a616c
>
> --
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