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Subject[patch 07/15] security: pass path to inode_link
From: Miklos Szeredi <mszeredi@suse.cz>

In the inode_link() security operation and related functions pass the
path (vfsmount + dentry) to the parent directory instead of the inode.
AppArmor will need this.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
---
fs/namei.c | 10 +++++-----
include/linux/security.h | 8 ++++----
security/dummy.c | 4 ++--
security/security.c | 2 +-
security/selinux/hooks.c | 5 +++--
security/smack/smack_lsm.c | 2 +-
6 files changed, 16 insertions(+), 15 deletions(-)

Index: linux-2.6/fs/namei.c
===================================================================
--- linux-2.6.orig/fs/namei.c 2008-05-29 12:20:54.000000000 +0200
+++ linux-2.6/fs/namei.c 2008-05-29 12:20:55.000000000 +0200
@@ -2531,17 +2531,17 @@ asmlinkage long sys_symlink(const char _
return sys_symlinkat(oldname, AT_FDCWD, newname);
}

-static int vfs_link(struct dentry *old_dentry, struct dentry *new_dir_dentry,
+static int vfs_link(struct dentry *old_dentry, struct path *new_dir_path,
struct dentry *new_dentry)
{
- struct inode *dir = new_dir_dentry->d_inode;
+ struct inode *dir = new_dir_path->dentry->d_inode;
struct inode *inode = old_dentry->d_inode;
int error;

if (!inode)
return -ENOENT;

- error = may_create(new_dir_dentry, new_dentry);
+ error = may_create(new_dir_path->dentry, new_dentry);
if (error)
return error;

@@ -2558,7 +2558,7 @@ static int vfs_link(struct dentry *old_d
if (S_ISDIR(inode->i_mode))
return -EPERM;

- error = security_inode_link(old_dentry, dir, new_dentry);
+ error = security_inode_link(old_dentry, new_dir_path, new_dentry);
if (error)
return error;

@@ -2577,7 +2577,7 @@ int path_link(struct dentry *old_dentry,
int error = mnt_want_write(dir_path->mnt);

if (!error) {
- error = vfs_link(old_dentry, dir_path->dentry, new_dentry);
+ error = vfs_link(old_dentry, dir_path, new_dentry);
mnt_drop_write(dir_path->mnt);
}

Index: linux-2.6/include/linux/security.h
===================================================================
--- linux-2.6.orig/include/linux/security.h 2008-05-29 12:20:54.000000000 +0200
+++ linux-2.6/include/linux/security.h 2008-05-29 12:20:55.000000000 +0200
@@ -346,7 +346,7 @@ static inline void security_free_mnt_opt
* @inode_link:
* Check permission before creating a new hard link to a file.
* @old_dentry contains the dentry structure for an existing link to the file.
- * @dir contains the inode structure of the parent directory of the new link.
+ * @dir contains the path to the parent of the new link.
* @new_dentry contains the dentry structure for the new link.
* Return 0 if permission is granted.
* @inode_unlink:
@@ -1355,7 +1355,7 @@ struct security_operations {
char **name, void **value, size_t *len);
int (*inode_create) (struct path *dir, struct dentry *dentry, int mode);
int (*inode_link) (struct dentry *old_dentry,
- struct inode *dir, struct dentry *new_dentry);
+ struct path *dir, struct dentry *new_dentry);
int (*inode_unlink) (struct path *dir, struct dentry *dentry);
int (*inode_symlink) (struct path *dir,
struct dentry *dentry, const char *old_name);
@@ -1626,7 +1626,7 @@ void security_inode_free(struct inode *i
int security_inode_init_security(struct inode *inode, struct inode *dir,
char **name, void **value, size_t *len);
int security_inode_create(struct path *dir, struct dentry *dentry, int mode);
-int security_inode_link(struct dentry *old_dentry, struct inode *dir,
+int security_inode_link(struct dentry *old_dentry, struct path *dir,
struct dentry *new_dentry);
int security_inode_unlink(struct path *dir, struct dentry *dentry);
int security_inode_symlink(struct path *dir, struct dentry *dentry,
@@ -1972,7 +1972,7 @@ static inline int security_inode_create(
}

static inline int security_inode_link(struct dentry *old_dentry,
- struct inode *dir,
+ struct path *dir,
struct dentry *new_dentry)
{
return 0;
Index: linux-2.6/security/dummy.c
===================================================================
--- linux-2.6.orig/security/dummy.c 2008-05-29 12:20:54.000000000 +0200
+++ linux-2.6/security/dummy.c 2008-05-29 12:20:55.000000000 +0200
@@ -292,8 +292,8 @@ static int dummy_inode_create(struct pat
return 0;
}

-static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
- struct dentry *new_dentry)
+static int dummy_inode_link(struct dentry *old_dentry, struct path *dir,
+ struct dentry *new_dentry)
{
return 0;
}
Index: linux-2.6/security/security.c
===================================================================
--- linux-2.6.orig/security/security.c 2008-05-29 12:20:54.000000000 +0200
+++ linux-2.6/security/security.c 2008-05-29 12:20:55.000000000 +0200
@@ -395,7 +395,7 @@ int security_inode_create(struct path *d
return security_ops->inode_create(dir, dentry, mode);
}

-int security_inode_link(struct dentry *old_dentry, struct inode *dir,
+int security_inode_link(struct dentry *old_dentry, struct path *dir,
struct dentry *new_dentry)
{
if (unlikely(IS_PRIVATE(old_dentry->d_inode)))
Index: linux-2.6/security/selinux/hooks.c
===================================================================
--- linux-2.6.orig/security/selinux/hooks.c 2008-05-29 12:20:54.000000000 +0200
+++ linux-2.6/security/selinux/hooks.c 2008-05-29 12:20:55.000000000 +0200
@@ -2488,14 +2488,15 @@ static int selinux_inode_create(struct p
return may_create(dir->dentry->d_inode, dentry, SECCLASS_FILE);
}

-static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
+static int selinux_inode_link(struct dentry *old_dentry, struct path *dir,
+ struct dentry *new_dentry)
{
int rc;

rc = secondary_ops->inode_link(old_dentry, dir, new_dentry);
if (rc)
return rc;
- return may_link(dir, old_dentry, MAY_LINK);
+ return may_link(dir->dentry->d_inode, old_dentry, MAY_LINK);
}

static int selinux_inode_unlink(struct path *dir, struct dentry *dentry)
Index: linux-2.6/security/smack/smack_lsm.c
===================================================================
--- linux-2.6.orig/security/smack/smack_lsm.c 2008-05-29 12:20:53.000000000 +0200
+++ linux-2.6/security/smack/smack_lsm.c 2008-05-29 12:20:55.000000000 +0200
@@ -412,7 +412,7 @@ static int smack_inode_init_security(str
*
* Returns 0 if access is permitted, an error code otherwise
*/
-static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
+static int smack_inode_link(struct dentry *old_dentry, struct path *dir,
struct dentry *new_dentry)
{
int rc;
--


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