linux-kernel - Re: [PATCH -next] selinux: access superblock_security

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Date:   Tue, 25 Jan 2022 09:16:16 -0800
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     "GONG, Ruiqi" <gongruiqi1@...wei.com>,
        Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <stephen.smalley.work@...il.com>,
        Eric Paris <eparis@...isplace.org>
Cc:     Ondrej Mosnacek <omosnace@...hat.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Olga Kornievskaia <kolga@...app.com>, selinux@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Wang Weiyang <wangweiyang2@...wei.com>,
        Xiu Jianfeng <xiujianfeng@...wei.com>,
        Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [PATCH -next] selinux: access superblock_security_struct in LSM
 blob way

On 1/24/2022 11:11 PM, GONG, Ruiqi wrote:
> LSM blob has been involved for superblock's security struct. So fix the
> remaining direct access to sb->s_security by using the LSM blob
> mechanism.
>
> Fixes: 08abe46b2cfc ("selinux: fall back to SECURITY_FS_USE_GENFS if no xattr support")
> Fixes: 69c4a42d72eb ("lsm,selinux: add new hook to compare new mount to an existing mount")
> Signed-off-by: GONG, Ruiqi <gongruiqi1@...wei.com>

Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>

This is pretty important.

> ---
>   security/selinux/hooks.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 5b6895e4fc29..a0243bae8423 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -479,7 +479,7 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
>   
>   static int sb_check_xattr_support(struct super_block *sb)
>   {
> -	struct superblock_security_struct *sbsec = sb->s_security;
> +	struct superblock_security_struct *sbsec = selinux_superblock(sb);
>   	struct dentry *root = sb->s_root;
>   	struct inode *root_inode = d_backing_inode(root);
>   	u32 sid;
> @@ -2647,7 +2647,7 @@ static int selinux_sb_eat_lsm_opts(char *options, void **mnt_opts)
>   static int selinux_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts)
>   {
>   	struct selinux_mnt_opts *opts = mnt_opts;
> -	struct superblock_security_struct *sbsec = sb->s_security;
> +	struct superblock_security_struct *sbsec = selinux_superblock(sb);
>   	u32 sid;
>   	int rc;
>