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Subject[patch 02/15] security: pass path to inode_mknod
From: Miklos Szeredi <mszeredi@suse.cz>

In the inode_mknod() 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 | 9 +++++----
security/dummy.c | 4 ++--
security/security.c | 5 +++--
security/selinux/hooks.c | 6 ++++--
5 files changed, 19 insertions(+), 15 deletions(-)
Index: linux-2.6/fs/namei.c
===================================================================
--- linux-2.6.orig/fs/namei.c 2008-05-29 12:20:51.000000000 +0200
+++ linux-2.6/fs/namei.c 2008-05-29 12:20:52.000000000 +0200
@@ -2044,11 +2044,11 @@ fail:
}
EXPORT_SYMBOL_GPL(lookup_create);

-static int vfs_mknod(struct dentry *dir_dentry, struct dentry *dentry,
+static int vfs_mknod(struct path *dir_path, struct dentry *dentry,
int mode, dev_t dev)
{
- struct inode *dir = dir_dentry->d_inode;
- int error = may_create(dir_dentry, dentry);
+ struct inode *dir = dir_path->dentry->d_inode;
+ int error = may_create(dir_path->dentry, dentry);

if (error)
return error;
@@ -2063,7 +2063,7 @@ static int vfs_mknod(struct dentry *dir_
if (error)
return error;

- error = security_inode_mknod(dir, dentry, mode, dev);
+ error = security_inode_mknod(dir_path, dentry, mode, dev);
if (error)
return error;

@@ -2080,7 +2080,7 @@ int path_mknod(struct path *dir_path, st
int error = mnt_want_write(dir_path->mnt);

if (!error) {
- error = vfs_mknod(dir_path->dentry, dentry, mode, dev);
+ error = vfs_mknod(dir_path, dentry, mode, dev);
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 12:20:51.000000000 +0200
+++ linux-2.6/include/linux/security.h 2008-05-29 12:20:52.000000000 +0200
@@ -377,7 +377,7 @@ static inline void security_free_mnt_opt
* file created via the mknod system call). Note that if mknod operation
* is being done for a regular file, then the create hook will be called
* and not this hook.
- * @dir contains the inode structure of parent of the new file.
+ * @dir contains the path to the parent of the new file.
* @dentry contains the dentry structure of the new file.
* @mode contains the mode of the new file.
* @dev contains the device number.
@@ -1361,7 +1361,7 @@ struct security_operations {
struct dentry *dentry, const char *old_name);
int (*inode_mkdir) (struct inode *dir, struct dentry *dentry, int mode);
int (*inode_rmdir) (struct inode *dir, struct dentry *dentry);
- int (*inode_mknod) (struct inode *dir, struct dentry *dentry,
+ int (*inode_mknod) (struct path *dir, struct dentry *dentry,
int mode, dev_t dev);
int (*inode_rename) (struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
@@ -1633,7 +1633,8 @@ int security_inode_symlink(struct inode
const char *old_name);
int security_inode_mkdir(struct inode *dir, struct dentry *dentry, int mode);
int security_inode_rmdir(struct inode *dir, struct dentry *dentry);
-int security_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev);
+int security_inode_mknod(struct path *dir, struct dentry *dentry, int mode,
+ dev_t dev);
int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
int security_inode_readlink(struct dentry *dentry);
@@ -2003,7 +2004,7 @@ static inline int security_inode_rmdir(s
return 0;
}

-static inline int security_inode_mknod(struct inode *dir,
+static inline int security_inode_mknod(struct path *dir,
struct dentry *dentry,
int mode, dev_t dev)
{
Index: linux-2.6/security/dummy.c
===================================================================
--- linux-2.6.orig/security/dummy.c 2008-05-29 12:20:51.000000000 +0200
+++ linux-2.6/security/dummy.c 2008-05-29 12:20:52.000000000 +0200
@@ -320,8 +320,8 @@ static int dummy_inode_rmdir (struct ino
return 0;
}

-static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
- int mode, dev_t dev)
+static int dummy_inode_mknod(struct path *dir, struct dentry *dentry,
+ int mode, dev_t dev)
{
return 0;
}
Index: linux-2.6/security/security.c
===================================================================
--- linux-2.6.orig/security/security.c 2008-05-29 12:20:51.000000000 +0200
+++ linux-2.6/security/security.c 2008-05-29 12:20:52.000000000 +0200
@@ -432,9 +432,10 @@ int security_inode_rmdir(struct inode *d
return security_ops->inode_rmdir(dir, dentry);
}

-int security_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+int security_inode_mknod(struct path *dir, struct dentry *dentry, int mode,
+ dev_t dev)
{
- if (unlikely(IS_PRIVATE(dir)))
+ if (unlikely(IS_PRIVATE(dir->dentry->d_inode)))
return 0;
return security_ops->inode_mknod(dir, dentry, mode, dev);
}
Index: linux-2.6/security/selinux/hooks.c
===================================================================
--- linux-2.6.orig/security/selinux/hooks.c 2008-05-29 12:20:51.000000000 +0200
+++ linux-2.6/security/selinux/hooks.c 2008-05-29 12:20:52.000000000 +0200
@@ -2523,7 +2523,8 @@ static int selinux_inode_rmdir(struct in
return may_link(dir, dentry, MAY_RMDIR);
}

-static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+static int selinux_inode_mknod(struct path *dir, struct dentry *dentry,
+ int mode, dev_t dev)
{
int rc;

@@ -2531,7 +2532,8 @@ static int selinux_inode_mknod(struct in
if (rc)
return rc;

- return may_create(dir, dentry, inode_mode_to_security_class(mode));
+ return may_create(dir->dentry->d_inode, dentry,
+ inode_mode_to_security_class(mode));
}

static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
--


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