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Subject[AppArmor 22/41] Pass struct vfsmount to the inode_rename LSM hook
This is needed for computing pathnames in the AppArmor LSM.

Signed-off-by: Tony Jones <tonyj@suse.de>
Signed-off-by: Andreas Gruenbacher <agruen@suse.de>
Signed-off-by: John Johansen <jjohansen@suse.de>

---
fs/namei.c | 6 ++++--
include/linux/security.h | 18 +++++++++++++-----
security/dummy.c | 4 +++-
security/selinux/hooks.c | 8 ++++++--
4 files changed, 26 insertions(+), 10 deletions(-)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2399,7 +2399,8 @@ static int vfs_rename_dir(struct inode *
return error;
}

- error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
+ error = security_inode_rename(old_dir, old_dentry, old_mnt,
+ new_dir, new_dentry, new_mnt);
if (error)
return error;

@@ -2433,7 +2434,8 @@ static int vfs_rename_other(struct inode
struct inode *target;
int error;

- error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
+ error = security_inode_rename(old_dir, old_dentry, old_mnt,
+ new_dir, new_dentry, new_mnt);
if (error)
return error;

--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -336,8 +336,10 @@ struct request_sock;
* Check for permission to rename a file or directory.
* @old_dir contains the inode structure for parent of the old link.
* @old_dentry contains the dentry structure of the old link.
+ * @old_mnt is the vfsmount corresponding to @old_dentry (may be NULL).
* @new_dir contains the inode structure for parent of the new link.
* @new_dentry contains the dentry structure of the new link.
+ * @new_mnt is the vfsmount corresponding to @new_dentry (may be NULL).
* Return 0 if permission is granted.
* @inode_readlink:
* Check the permission to read the symbolic link.
@@ -1230,7 +1232,9 @@ struct security_operations {
int (*inode_mknod) (struct inode *dir, struct dentry *dentry,
struct vfsmount *mnt, int mode, dev_t dev);
int (*inode_rename) (struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry);
+ struct vfsmount *old_mnt,
+ struct inode *new_dir, struct dentry *new_dentry,
+ struct vfsmount *new_mnt);
int (*inode_readlink) (struct dentry *dentry, struct vfsmount *mnt);
int (*inode_follow_link) (struct dentry *dentry, struct nameidata *nd);
int (*inode_permission) (struct inode *inode, int mask, struct nameidata *nd);
@@ -1696,14 +1700,16 @@ static inline int security_inode_mknod (

static inline int security_inode_rename (struct inode *old_dir,
struct dentry *old_dentry,
+ struct vfsmount *old_mnt,
struct inode *new_dir,
- struct dentry *new_dentry)
+ struct dentry *new_dentry,
+ struct vfsmount *new_mnt)
{
if (unlikely (IS_PRIVATE (old_dentry->d_inode) ||
(new_dentry->d_inode && IS_PRIVATE (new_dentry->d_inode))))
return 0;
- return security_ops->inode_rename (old_dir, old_dentry,
- new_dir, new_dentry);
+ return security_ops->inode_rename (old_dir, old_dentry, old_mnt,
+ new_dir, new_dentry, new_mnt);
}

static inline int security_inode_readlink (struct dentry *dentry,
@@ -2419,8 +2425,10 @@ static inline int security_inode_mknod (

static inline int security_inode_rename (struct inode *old_dir,
struct dentry *old_dentry,
+ struct vfsmount *old_mnt,
struct inode *new_dir,
- struct dentry *new_dentry)
+ struct dentry *new_dentry,
+ struct vfsmount *new_mnt)
{
return 0;
}
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -310,8 +310,10 @@ static int dummy_inode_mknod (struct ino

static int dummy_inode_rename (struct inode *old_inode,
struct dentry *old_dentry,
+ struct vfsmount *old_mnt,
struct inode *new_inode,
- struct dentry *new_dentry)
+ struct dentry *new_dentry,
+ struct vfsmount *new_mnt)
{
return 0;
}
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2240,8 +2240,12 @@ static int selinux_inode_mknod(struct in
return may_create(dir, dentry, inode_mode_to_security_class(mode));
}

-static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
- struct inode *new_inode, struct dentry *new_dentry)
+static int selinux_inode_rename(struct inode *old_inode,
+ struct dentry *old_dentry,
+ struct vfsmount *old_mnt,
+ struct inode *new_inode,
+ struct dentry *new_dentry,
+ struct vfsmount *new_mnt)
{
return may_rename(old_inode, old_dentry, new_inode, new_dentry);
}
--
-
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