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Subject[AppArmor 10/47] Pass struct vfsmount to the inode_symlink 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 | 2 +-
include/linux/security.h | 8 +++++---
security/dummy.c | 2 +-
security/security.c | 4 ++--
security/selinux/hooks.c | 3 ++-
5 files changed, 11 insertions(+), 8 deletions(-)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2402,7 +2402,7 @@ int vfs_symlink(struct inode *dir, struc
if (!dir->i_op || !dir->i_op->symlink)
return -EPERM;

- error = security_inode_symlink(dir, dentry, oldname);
+ error = security_inode_symlink(dir, dentry, mnt, oldname);
if (error)
return error;

--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -332,6 +332,7 @@ struct request_sock;
* Check the permission to create a symbolic link to a file.
* @dir contains the inode structure of parent directory of the symbolic link.
* @dentry contains the dentry structure of the symbolic link.
+ * @mnt is the vfsmount corresponding to @dentry (may be NULL).
* @old_name contains the pathname of file.
* Return 0 if permission is granted.
* @inode_mkdir:
@@ -1281,8 +1282,8 @@ struct security_operations {
int (*inode_link) (struct dentry *old_dentry,
struct inode *dir, struct dentry *new_dentry);
int (*inode_unlink) (struct inode *dir, struct dentry *dentry);
- int (*inode_symlink) (struct inode *dir,
- struct dentry *dentry, const char *old_name);
+ int (*inode_symlink) (struct inode *dir, struct dentry *dentry,
+ struct vfsmount *mnt, const char *old_name);
int (*inode_mkdir) (struct inode *dir, struct dentry *dentry,
struct vfsmount *mnt, int mode);
int (*inode_rmdir) (struct inode *dir, struct dentry *dentry);
@@ -1548,7 +1549,7 @@ int security_inode_link(struct dentry *o
struct dentry *new_dentry);
int security_inode_unlink(struct inode *dir, struct dentry *dentry);
int security_inode_symlink(struct inode *dir, struct dentry *dentry,
- const char *old_name);
+ struct vfsmount *mnt, const char *old_name);
int security_inode_mkdir(struct inode *dir, struct dentry *dentry,
struct vfsmount *mnt, int mode);
int security_inode_rmdir(struct inode *dir, struct dentry *dentry);
@@ -1878,6 +1879,7 @@ static inline int security_inode_unlink

static inline int security_inode_symlink (struct inode *dir,
struct dentry *dentry,
+ struct vfsmount *mnt,
const char *old_name)
{
return 0;
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -307,7 +307,7 @@ static int dummy_inode_unlink (struct in
}

static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
- const char *name)
+ struct vfsmount *mnt, const char *name)
{
return 0;
}
--- a/security/security.c
+++ b/security/security.c
@@ -372,11 +372,11 @@ int security_inode_unlink(struct inode *
}

int security_inode_symlink(struct inode *dir, struct dentry *dentry,
- const char *old_name)
+ struct vfsmount *mnt, const char *old_name)
{
if (unlikely(IS_PRIVATE(dir)))
return 0;
- return security_ops->inode_symlink(dir, dentry, old_name);
+ return security_ops->inode_symlink(dir, dentry, mnt, old_name);
}

int security_inode_mkdir(struct inode *dir, struct dentry *dentry,
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2437,7 +2437,8 @@ static int selinux_inode_unlink(struct i
return may_link(dir, dentry, MAY_UNLINK);
}

-static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const char *name)
+static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry,
+ struct vfsmount *mnt, const char *name)
{
return may_create(dir, dentry, SECCLASS_LNK_FILE);
}
--



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