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Date: Fri, 19 Dec 2008 07:52:35 -0500
From: Stephen Smalley <sds@...ho.nsa.gov>
To: James Morris <jmorris@...ei.org>
Cc: linux-security-module@...r.kernel.org,
Alexey Dobriyan <adobriyan@...il.com>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
David Miller <davem@...emloft.net>, auke-jan.h.kok@...el.com,
Andrew Morton <akpm@...ux-foundation.org>,
e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org,
Eric Paris <eparis@...isplace.org>,
Al Viro <viro@....linux.org.uk>,
Chris Wright <chrisw@...s-sol.org>
Subject: Re: [PATCH 2/3][RFC] security: pass mount flags to
security_sb_kern_mount()
On Fri, 2008-12-19 at 12:06 +1100, James Morris wrote:
> Pass mount flags to security_sb_kern_mount(), so security modules
> can determine if a mount operation is being performed by the kernel.
>
> Signed-off-by: James Morris <jmorris@...ei.org>
Acked-by: Stephen Smalley <sds@...ho.nsa.gov>
> ---
> fs/super.c | 2 +-
> include/linux/security.h | 6 +++---
> security/capability.c | 2 +-
> security/security.c | 4 ++--
> security/selinux/hooks.c | 2 +-
> security/smack/smack_lsm.c | 3 ++-
> 6 files changed, 10 insertions(+), 9 deletions(-)
>
> diff --git a/fs/super.c b/fs/super.c
> index 400a760..ddba069 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -914,7 +914,7 @@ vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void
> goto out_free_secdata;
> BUG_ON(!mnt->mnt_sb);
>
> - error = security_sb_kern_mount(mnt->mnt_sb, secdata);
> + error = security_sb_kern_mount(mnt->mnt_sb, flags, secdata);
> if (error)
> goto out_sb;
>
> diff --git a/include/linux/security.h b/include/linux/security.h
> index c13f1ce..dff563b 100644
> --- a/include/linux/security.h
> +++ b/include/linux/security.h
> @@ -1327,7 +1327,7 @@ struct security_operations {
> int (*sb_alloc_security) (struct super_block *sb);
> void (*sb_free_security) (struct super_block *sb);
> int (*sb_copy_data) (char *orig, char *copy);
> - int (*sb_kern_mount) (struct super_block *sb, void *data);
> + int (*sb_kern_mount) (struct super_block *sb, int flags, void *data);
> int (*sb_show_options) (struct seq_file *m, struct super_block *sb);
> int (*sb_statfs) (struct dentry *dentry);
> int (*sb_mount) (char *dev_name, struct path *path,
> @@ -1596,7 +1596,7 @@ int security_bprm_secureexec(struct linux_binprm *bprm);
> int security_sb_alloc(struct super_block *sb);
> void security_sb_free(struct super_block *sb);
> int security_sb_copy_data(char *orig, char *copy);
> -int security_sb_kern_mount(struct super_block *sb, void *data);
> +int security_sb_kern_mount(struct super_block *sb, int flags, void *data);
> int security_sb_show_options(struct seq_file *m, struct super_block *sb);
> int security_sb_statfs(struct dentry *dentry);
> int security_sb_mount(char *dev_name, struct path *path,
> @@ -1877,7 +1877,7 @@ static inline int security_sb_copy_data(char *orig, char *copy)
> return 0;
> }
>
> -static inline int security_sb_kern_mount(struct super_block *sb, void *data)
> +static inline int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
> {
> return 0;
> }
> diff --git a/security/capability.c b/security/capability.c
> index 2458748..0f6612d 100644
> --- a/security/capability.c
> +++ b/security/capability.c
> @@ -64,7 +64,7 @@ static int cap_sb_copy_data(char *orig, char *copy)
> return 0;
> }
>
> -static int cap_sb_kern_mount(struct super_block *sb, void *data)
> +static int cap_sb_kern_mount(struct super_block *sb, int flags, void *data)
> {
> return 0;
> }
> diff --git a/security/security.c b/security/security.c
> index c0acfa7..5a37d79 100644
> --- a/security/security.c
> +++ b/security/security.c
> @@ -266,9 +266,9 @@ int security_sb_copy_data(char *orig, char *copy)
> }
> EXPORT_SYMBOL(security_sb_copy_data);
>
> -int security_sb_kern_mount(struct super_block *sb, void *data)
> +int security_sb_kern_mount(struct super_block *sb, int flags, void *data)
> {
> - return security_ops->sb_kern_mount(sb, data);
> + return security_ops->sb_kern_mount(sb, flags, data);
> }
>
> int security_sb_show_options(struct seq_file *m, struct super_block *sb)
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 470763a..3897758 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -2452,7 +2452,7 @@ out:
> return rc;
> }
>
> -static int selinux_sb_kern_mount(struct super_block *sb, void *data)
> +static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data)
> {
> struct avc_audit_data ad;
> int rc;
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index 6e2dc0b..f23e927 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -248,11 +248,12 @@ static int smack_sb_copy_data(char *orig, char *smackopts)
> /**
> * smack_sb_kern_mount - Smack specific mount processing
> * @sb: the file system superblock
> + * @flags: the mount flags
> * @data: the smack mount options
> *
> * Returns 0 on success, an error code on failure
> */
> -static int smack_sb_kern_mount(struct super_block *sb, void *data)
> +static int smack_sb_kern_mount(struct super_block *sb, int flags, void *data)
> {
> struct dentry *root = sb->s_root;
> struct inode *inode = root->d_inode;
--
Stephen Smalley
National Security Agency
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