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    Subject[PATCH 12/19] security: Add hooks to rule on setting a superblock or mount watch [ver #16]
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    Add security hooks that will allow an LSM to rule on whether or not a watch
    may be set on a mount or on a superblock. More than one hook is required
    as the watches watch different types of object.

    Signed-off-by: David Howells <dhowells@redhat.com>
    cc: Casey Schaufler <casey@schaufler-ca.com>
    cc: Stephen Smalley <sds@tycho.nsa.gov>
    cc: linux-security-module@vger.kernel.org
    ---

    include/linux/lsm_hooks.h | 24 ++++++++++++++++++++++++
    include/linux/security.h | 16 ++++++++++++++++
    security/security.c | 14 ++++++++++++++
    3 files changed, 54 insertions(+)

    diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
    index 16530255dc11..c4451ac197ae 100644
    --- a/include/linux/lsm_hooks.h
    +++ b/include/linux/lsm_hooks.h
    @@ -1427,6 +1427,18 @@
    * Check to see if a process is allowed to watch for event notifications
    * from devices (as a global set).
    *
    + * @watch_mount:
    + * Check to see if a process is allowed to watch for mount topology change
    + * notifications on a mount subtree.
    + * @watch: The watch object
    + * @path: The root of the subtree to watch.
    + *
    + * @watch_sb:
    + * Check to see if a process is allowed to watch for event notifications
    + * from a superblock.
    + * @watch: The watch object
    + * @sb: The superblock to watch.
    + *
    * @post_notification:
    * Check to see if a watch notification can be posted to a particular
    * queue.
    @@ -1722,6 +1734,12 @@ union security_list_options {
    #ifdef CONFIG_DEVICE_NOTIFICATIONS
    int (*watch_devices)(void);
    #endif
    +#ifdef CONFIG_MOUNT_NOTIFICATIONS
    + int (*watch_mount)(struct watch *watch, struct path *path);
    +#endif
    +#ifdef CONFIG_SB_NOTIFICATIONS
    + int (*watch_sb)(struct watch *watch, struct super_block *sb);
    +#endif
    #ifdef CONFIG_WATCH_QUEUE
    int (*post_notification)(const struct cred *w_cred,
    const struct cred *cred,
    @@ -2020,6 +2038,12 @@ struct security_hook_heads {
    #ifdef CONFIG_DEVICE_NOTIFICATIONS
    struct hlist_head watch_devices;
    #endif
    +#ifdef CONFIG_MOUNT_NOTIFICATIONS
    + struct hlist_head watch_mount;
    +#endif
    +#ifdef CONFIG_SB_NOTIFICATIONS
    + struct hlist_head watch_sb;
    +#endif
    #ifdef CONFIG_WATCH_QUEUE
    struct hlist_head post_notification;
    #endif /* CONFIG_WATCH_QUEUE */
    diff --git a/include/linux/security.h b/include/linux/security.h
    index 910a1efa9a79..2ca2569bc12c 100644
    --- a/include/linux/security.h
    +++ b/include/linux/security.h
    @@ -1306,6 +1306,22 @@ static inline int security_post_notification(const struct cred *w_cred,
    return 0;
    }
    #endif
    +#if defined(CONFIG_SECURITY) && defined(CONFIG_MOUNT_NOTIFICATIONS)
    +int security_watch_mount(struct watch *watch, struct path *path);
    +#else
    +static inline int security_watch_mount(struct watch *watch, struct path *path)
    +{
    + return 0;
    +}
    +#endif
    +#if defined(CONFIG_SECURITY) && defined(CONFIG_SB_NOTIFICATIONS)
    +int security_watch_sb(struct watch *watch, struct super_block *sb);
    +#else
    +static inline int security_watch_sb(struct watch *watch, struct super_block *sb)
    +{
    + return 0;
    +}
    +#endif

    #ifdef CONFIG_SECURITY_NETWORK

    diff --git a/security/security.c b/security/security.c
    index db7b574c9c70..5c0463444a90 100644
    --- a/security/security.c
    +++ b/security/security.c
    @@ -2004,6 +2004,20 @@ int security_watch_key(struct key *key)
    }
    #endif

    +#ifdef CONFIG_MOUNT_NOTIFICATIONS
    +int security_watch_mount(struct watch *watch, struct path *path)
    +{
    + return call_int_hook(watch_mount, 0, watch, path);
    +}
    +#endif
    +
    +#ifdef CONFIG_SB_NOTIFICATIONS
    +int security_watch_sb(struct watch *watch, struct super_block *sb)
    +{
    + return call_int_hook(watch_sb, 0, watch, sb);
    +}
    +#endif
    +
    #ifdef CONFIG_DEVICE_NOTIFICATIONS
    int security_watch_devices(void)
    {

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