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Message-Id: <20080501055543.269648000@nttdata.co.jp>
Date: Thu, 01 May 2008 14:54:06 +0900
From: Toshiharu Harada <haradats@...data.co.jp>
To: akpm@...ux-foundation.org, chrisw@...s-sol.org,
viro@...IV.linux.org.uk
Cc: linux-security-module@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
Kentaro Takeda <takedakn@...data.co.jp>,
Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
Toshiharu Harada <haradats@...data.co.jp>
Subject: [TOMOYO #8 (2.6.25-mm1) 1/7] Introduce new LSM hooks.
This patch allows LSM to check permission using "struct vfsmount"
without passing "struct vfsmount" to VFS helper functions.
Signed-off-by: Kentaro Takeda <takedakn@...data.co.jp>
Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Signed-off-by: Toshiharu Harada <haradats@...data.co.jp>
---
fs/exec.c | 10 ++
fs/namei.c | 129 +++++++++++++++++++++++++++++++---
fs/open.c | 7 +
include/linux/fs.h | 8 ++
include/linux/security.h | 178 +++++++++++++++++++++++++++++++++++++++++++++++
net/unix/af_unix.c | 4 +
security/dummy.c | 73 +++++++++++++++++++
security/security.c | 63 ++++++++++++++++
8 files changed, 462 insertions(+), 10 deletions(-)
--- mm.orig/fs/exec.c
+++ mm/fs/exec.c
@@ -119,6 +119,16 @@ asmlinkage long sys_uselib(const char __
if (error)
goto exit;
+ /*
+ * sys_access() with both R_OK and X_OK flags makes LSM's
+ * security_inode_permission() unable to tell whether the request is
+ * "just checking for permissions" or "actually loading a shared
+ * library".
+ */
+ error = security_path_uselib(&nd);
+ if (error)
+ goto exit;
+
file = nameidata_to_filp(&nd, O_RDONLY|O_LARGEFILE);
error = PTR_ERR(file);
if (IS_ERR(file))
--- mm.orig/fs/namei.c
+++ mm/fs/namei.c
@@ -1595,6 +1595,9 @@ int vfs_create(struct inode *dir, struct
error = security_inode_create(dir, dentry, mode);
if (error)
return error;
+ error = security_path_create(dir, dentry, mode, nd);
+ if (error)
+ return error;
DQUOT_INIT(dir);
error = dir->i_op->create(dir, dentry, mode, nd);
if (!error)
@@ -1650,6 +1653,17 @@ int may_open(struct nameidata *nd, int a
return -EPERM;
/*
+ * security_inode_permission() called from vfs_permission()
+ * can't know that the file is going to be truncated when
+ * open(filename, O_WRONLY | O_TRUNC | O_APPEND) is used.
+ * So, this hook checks O_APPEND and O_TRUNC flags as well
+ * as MAY_READ and MAY_WRITE flags.
+ */
+ error = security_path_open(nd->path.dentry, nd->path.mnt, flag);
+ if (error)
+ return error;
+
+ /*
* Ensure there are no outstanding leases on the file.
*/
error = break_lease(inode, flag);
@@ -2021,7 +2035,12 @@ fail:
}
EXPORT_SYMBOL_GPL(lookup_create);
-int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+/*
+ * These pre_vfs_*() functions are separated from vfs_*() functions so that
+ * LSM's security_path_*() functions can do DAC checks before MAC checks
+ * without duplicating may_create()/may_delete() functions.
+ */
+int pre_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode)
{
int error = may_create(dir, dentry, NULL);
@@ -2033,6 +2052,14 @@ int vfs_mknod(struct inode *dir, struct
if (!dir->i_op || !dir->i_op->mknod)
return -EPERM;
+ return 0;
+}
+
+int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
+{
+ int error = pre_vfs_mknod(dir, dentry, mode);
+ if (error)
+ return error;
error = devcgroup_inode_mknod(mode, dev);
if (error)
@@ -2096,6 +2123,9 @@ asmlinkage long sys_mknodat(int dfd, con
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_mknod(&nd.path, dentry, mode, dev);
+ if (error)
+ goto out_drop_write;
switch (mode & S_IFMT) {
case 0: case S_IFREG:
error = vfs_create(nd.path.dentry->d_inode,dentry,mode,&nd);
@@ -2108,6 +2138,7 @@ asmlinkage long sys_mknodat(int dfd, con
error = vfs_mknod(nd.path.dentry->d_inode,dentry,mode,0);
break;
}
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
@@ -2125,7 +2156,7 @@ asmlinkage long sys_mknod(const char __u
return sys_mknodat(AT_FDCWD, filename, mode, dev);
}
-int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+int pre_vfs_mkdir(struct inode *dir, struct dentry *dentry)
{
int error = may_create(dir, dentry, NULL);
@@ -2134,6 +2165,14 @@ int vfs_mkdir(struct inode *dir, struct
if (!dir->i_op || !dir->i_op->mkdir)
return -EPERM;
+ return 0;
+}
+
+int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+ int error = pre_vfs_mkdir(dir, dentry);
+ if (error)
+ return error;
mode &= (S_IRWXUGO|S_ISVTX);
error = security_inode_mkdir(dir, dentry, mode);
@@ -2172,7 +2211,11 @@ asmlinkage long sys_mkdirat(int dfd, con
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_mkdir(&nd.path, dentry, mode);
+ if (error)
+ goto out_drop_write;
error = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
@@ -2217,7 +2260,7 @@ void dentry_unhash(struct dentry *dentry
spin_unlock(&dcache_lock);
}
-int vfs_rmdir(struct inode *dir, struct dentry *dentry)
+int pre_vfs_rmdir(struct inode *dir, struct dentry *dentry)
{
int error = may_delete(dir, dentry, 1);
@@ -2226,6 +2269,14 @@ int vfs_rmdir(struct inode *dir, struct
if (!dir->i_op || !dir->i_op->rmdir)
return -EPERM;
+ return 0;
+}
+
+int vfs_rmdir(struct inode *dir, struct dentry *dentry)
+{
+ int error = pre_vfs_rmdir(dir, dentry);
+ if (error)
+ return error;
DQUOT_INIT(dir);
@@ -2284,7 +2335,11 @@ static long do_rmdir(int dfd, const char
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit3;
+ error = security_path_rmdir(&nd.path, dentry);
+ if (error)
+ goto exit4;
error = vfs_rmdir(nd.path.dentry->d_inode, dentry);
+exit4:
mnt_drop_write(nd.path.mnt);
exit3:
dput(dentry);
@@ -2302,7 +2357,7 @@ asmlinkage long sys_rmdir(const char __u
return do_rmdir(AT_FDCWD, pathname);
}
-int vfs_unlink(struct inode *dir, struct dentry *dentry)
+int pre_vfs_unlink(struct inode *dir, struct dentry *dentry)
{
int error = may_delete(dir, dentry, 0);
@@ -2311,6 +2366,14 @@ int vfs_unlink(struct inode *dir, struct
if (!dir->i_op || !dir->i_op->unlink)
return -EPERM;
+ return 0;
+}
+
+int vfs_unlink(struct inode *dir, struct dentry *dentry)
+{
+ int error = pre_vfs_unlink(dir, dentry);
+ if (error)
+ return error;
DQUOT_INIT(dir);
@@ -2370,7 +2433,11 @@ static long do_unlinkat(int dfd, const c
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit2;
+ error = security_path_unlink(&nd.path, dentry);
+ if (error)
+ goto exit3;
error = vfs_unlink(nd.path.dentry->d_inode, dentry);
+exit3:
mnt_drop_write(nd.path.mnt);
exit2:
dput(dentry);
@@ -2406,7 +2473,7 @@ asmlinkage long sys_unlink(const char __
return do_unlinkat(AT_FDCWD, pathname);
}
-int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, int mode)
+int pre_vfs_symlink(struct inode *dir, struct dentry *dentry)
{
int error = may_create(dir, dentry, NULL);
@@ -2415,6 +2482,15 @@ int vfs_symlink(struct inode *dir, struc
if (!dir->i_op || !dir->i_op->symlink)
return -EPERM;
+ return 0;
+}
+
+int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname,
+ int mode)
+{
+ int error = pre_vfs_symlink(dir, dentry);
+ if (error)
+ return error;
error = security_inode_symlink(dir, dentry, oldname);
if (error)
@@ -2455,7 +2531,11 @@ asmlinkage long sys_symlinkat(const char
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_symlink(&nd.path, dentry, from);
+ if (error)
+ goto out_drop_write;
error = vfs_symlink(nd.path.dentry->d_inode, dentry, from, S_IALLUGO);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(dentry);
@@ -2474,7 +2554,8 @@ asmlinkage long sys_symlink(const char _
return sys_symlinkat(oldname, AT_FDCWD, newname);
}
-int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
+int pre_vfs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *new_dentry)
{
struct inode *inode = old_dentry->d_inode;
int error;
@@ -2498,6 +2579,15 @@ int vfs_link(struct dentry *old_dentry,
return -EPERM;
if (S_ISDIR(old_dentry->d_inode->i_mode))
return -EPERM;
+ return 0;
+}
+
+int vfs_link(struct dentry *old_dentry, struct inode *dir,
+ struct dentry *new_dentry)
+{
+ int error = pre_vfs_link(old_dentry, dir, new_dentry);
+ if (error)
+ return error;
error = security_inode_link(old_dentry, dir, new_dentry);
if (error)
@@ -2555,7 +2645,11 @@ asmlinkage long sys_linkat(int olddfd, c
error = mnt_want_write(nd.path.mnt);
if (error)
goto out_dput;
+ error = security_path_link(&old_nd.path, &nd.path, new_dentry);
+ if (error)
+ goto out_drop_write;
error = vfs_link(old_nd.path.dentry, nd.path.dentry->d_inode, new_dentry);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
out_dput:
dput(new_dentry);
@@ -2679,16 +2773,15 @@ static int vfs_rename_other(struct inode
return error;
}
-int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
- struct inode *new_dir, struct dentry *new_dentry)
+int pre_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
{
int error;
int is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
- const char *old_name;
if (old_dentry->d_inode == new_dentry->d_inode)
return 0;
-
+
error = may_delete(old_dir, old_dentry, is_dir);
if (error)
return error;
@@ -2702,6 +2795,17 @@ int vfs_rename(struct inode *old_dir, st
if (!old_dir->i_op || !old_dir->i_op->rename)
return -EPERM;
+ return 0;
+}
+
+int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
+ struct inode *new_dir, struct dentry *new_dentry)
+{
+ int error = pre_vfs_rename(old_dir, old_dentry, new_dir, new_dentry);
+ int is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
+ const char *old_name;
+ if (error)
+ return error;
DQUOT_INIT(old_dir);
DQUOT_INIT(new_dir);
@@ -2786,8 +2890,13 @@ static int do_rename(int olddfd, const c
error = mnt_want_write(oldnd.path.mnt);
if (error)
goto exit5;
+ error = security_path_rename(&oldnd.path, old_dentry,
+ &newnd.path, new_dentry);
+ if (error)
+ goto exit6;
error = vfs_rename(old_dir->d_inode, old_dentry,
new_dir->d_inode, new_dentry);
+exit6:
mnt_drop_write(oldnd.path.mnt);
exit5:
dput(new_dentry);
--- mm.orig/fs/open.c
+++ mm/fs/open.c
@@ -268,6 +268,9 @@ static long do_sys_truncate(const char _
if (error)
goto put_write_and_out;
+ error = security_path_truncate(&nd.path, length, 0, NULL);
+ if (error)
+ goto put_write_and_out;
error = locks_verify_truncate(inode, NULL, length);
if (!error) {
DQUOT_INIT(inode);
@@ -324,6 +327,10 @@ static long do_sys_ftruncate(unsigned in
if (IS_APPEND(inode))
goto out_putf;
+ error = security_path_truncate(&file->f_path, length,
+ ATTR_MTIME|ATTR_CTIME, file);
+ if (error)
+ goto out_putf;
error = locks_verify_truncate(inode, file, length);
if (!error)
error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
--- mm.orig/include/linux/fs.h
+++ mm/include/linux/fs.h
@@ -1124,12 +1124,20 @@ extern void unlock_super(struct super_bl
*/
extern int vfs_permission(struct nameidata *, int);
extern int vfs_create(struct inode *, struct dentry *, int, struct nameidata *);
+extern int pre_vfs_mkdir(struct inode *, struct dentry *);
extern int vfs_mkdir(struct inode *, struct dentry *, int);
+extern int pre_vfs_mknod(struct inode *, struct dentry *, int);
extern int vfs_mknod(struct inode *, struct dentry *, int, dev_t);
+extern int pre_vfs_symlink(struct inode *, struct dentry *);
extern int vfs_symlink(struct inode *, struct dentry *, const char *, int);
+extern int pre_vfs_link(struct dentry *, struct inode *, struct dentry *);
extern int vfs_link(struct dentry *, struct inode *, struct dentry *);
+extern int pre_vfs_rmdir(struct inode *, struct dentry *);
extern int vfs_rmdir(struct inode *, struct dentry *);
+extern int pre_vfs_unlink(struct inode *, struct dentry *);
extern int vfs_unlink(struct inode *, struct dentry *);
+extern int pre_vfs_rename(struct inode *, struct dentry *, struct inode *,
+ struct dentry *);
extern int vfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
/*
--- mm.orig/include/linux/security.h
+++ mm/include/linux/security.h
@@ -343,23 +343,50 @@ static inline void security_free_mnt_opt
* @dentry contains the dentry structure for the file to be created.
* @mode contains the file mode of the file to be created.
* Return 0 if permission is granted.
+ * @path_create:
+ * Check permission to create a regular file.
+ * @dir contains inode structure of the parent of the new file.
+ * @dentry contains the dentry structure for the file to be created.
+ * @mode contains the file mode of the file to be created.
+ * @nd contains the nameidata structure (may be NULL).
+ * Return 0 if permission is granted.
* @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.
* @new_dentry contains the dentry structure for the new link.
* Return 0 if permission is granted.
+ * @path_link:
+ * Check permission before creating a new hard link to a file.
+ * @old_path contains the path structure for an existing link
+ * to the file.
+ * @new_dir contains the path structure of the parent directory of
+ * the new link.
+ * @new_dentry contains the dentry structure for the new link.
+ * Return 0 if permission is granted.
* @inode_unlink:
* Check the permission to remove a hard link to a file.
* @dir contains the inode structure of parent directory of the file.
* @dentry contains the dentry structure for file to be unlinked.
* Return 0 if permission is granted.
+ * @path_unlink:
+ * Check the permission to remove a hard link to a file.
+ * @dir contains the path structure of parent directory of the file.
+ * @dentry contains the dentry structure for file to be unlinked.
+ * Return 0 if permission is granted.
* @inode_symlink:
* 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.
* @old_name contains the pathname of file.
* Return 0 if permission is granted.
+ * @path_symlink:
+ * Check the permission to create a symbolic link to a file.
+ * @dir contains the path structure of parent directory of
+ * the symbolic link.
+ * @dentry contains the dentry structure of the symbolic link.
+ * @old_name contains the pathname of file.
+ * Return 0 if permission is granted.
* @inode_mkdir:
* Check permissions to create a new directory in the existing directory
* associated with inode strcture @dir.
@@ -367,11 +394,25 @@ static inline void security_free_mnt_opt
* @dentry contains the dentry structure of new directory.
* @mode contains the mode of new directory.
* Return 0 if permission is granted.
+ * @path_mkdir:
+ * Check permissions to create a new directory in the existing directory
+ * associated with path strcture @path.
+ * @dir containst the path structure of parent of the directory
+ * to be created.
+ * @dentry contains the dentry structure of new directory.
+ * @mode contains the mode of new directory.
+ * Return 0 if permission is granted.
* @inode_rmdir:
* Check the permission to remove a directory.
* @dir contains the inode structure of parent of the directory to be removed.
* @dentry contains the dentry structure of directory to be removed.
* Return 0 if permission is granted.
+ * @path_rmdir:
+ * Check the permission to remove a directory.
+ * @dir contains the path structure of parent of the directory to be
+ * removed.
+ * @dentry contains the dentry structure of directory to be removed.
+ * Return 0 if permission is granted.
* @inode_mknod:
* Check permissions when creating a special file (or a socket or a fifo
* file created via the mknod system call). Note that if mknod operation
@@ -382,6 +423,15 @@ static inline void security_free_mnt_opt
* @mode contains the mode of the new file.
* @dev contains the device number.
* Return 0 if permission is granted.
+ * @path_mknod:
+ * Check permissions when creating a file. Note that this hook is called
+ * even if mknod operation is being done for a regular file.
+ * @dir contains the path structure of 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 undecoded device number. Use new_decode_dev() to get
+ * the decoded device number.
+ * Return 0 if permission is granted.
* @inode_rename:
* Check for permission to rename a file or directory.
* @old_dir contains the inode structure for parent of the old link.
@@ -389,6 +439,13 @@ static inline void security_free_mnt_opt
* @new_dir contains the inode structure for parent of the new link.
* @new_dentry contains the dentry structure of the new link.
* Return 0 if permission is granted.
+ * @path_rename:
+ * Check for permission to rename a file or directory.
+ * @old_dir contains the path structure for parent of the old link.
+ * @old_dentry contains the dentry structure of the old link.
+ * @new_dir contains the path structure for parent of the new link.
+ * @new_dentry contains the dentry structure of the new link.
+ * Return 0 if permission is granted.
* @inode_readlink:
* Check the permission to read the symbolic link.
* @dentry contains the dentry structure for the file link.
@@ -409,6 +466,12 @@ static inline void security_free_mnt_opt
* @mask contains the permission mask.
* @nd contains the nameidata (may be NULL).
* Return 0 if permission is granted.
+ * @path_open:
+ * Check permission to open a file.
+ * @dentry contains the dentry structure for the file to be opened.
+ * @mnt contains the vfsmount structure for the file to be opened.
+ * @flags contains the open flags.
+ * Return 0 if permission is granted.
* @inode_setattr:
* Check permission before setting file attributes. Note that the kernel
* call to notify_change is performed from several locations, whenever
@@ -417,6 +480,17 @@ static inline void security_free_mnt_opt
* @dentry contains the dentry structure for the file.
* @attr is the iattr structure containing the new file attributes.
* Return 0 if permission is granted.
+ * @path_truncate:
+ * Check permission before truncating a file.
+ * @path contains the path structure for the file.
+ * @length is the new length of the file.
+ * @time_attrs is the flags passed to do_truncate().
+ * @filp is the file structure (may be NULL).
+ * Return 0 if permission is granted.
+ * @path_uselib:
+ * Check permission before using a library.
+ * @nd contains the nameidata.
+ * Return 0 if permission is granted.
* @inode_getattr:
* Check permission before obtaining file attributes.
* @mnt is the vfsmount where the dentry was looked up
@@ -1351,6 +1425,25 @@ struct security_operations {
struct super_block *newsb);
int (*sb_parse_opts_str) (char *options, struct security_mnt_opts *opts);
+ int (*path_create) (struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd);
+ int (*path_unlink) (struct path *dir, struct dentry *dentry);
+ int (*path_mkdir) (struct path *dir, struct dentry *dentry, int mode);
+ int (*path_rmdir) (struct path *dir, struct dentry *dentry);
+ int (*path_mknod) (struct path *dir, struct dentry *dentry, int mode,
+ unsigned int dev);
+ int (*path_truncate) (struct path *path, loff_t length,
+ unsigned int time_attrs, struct file *filp);
+ int (*path_uselib) (struct nameidata *nd);
+ int (*path_symlink) (struct path *dir, struct dentry *dentry,
+ const char *old_name);
+ int (*path_link) (struct path *old_path, struct path *new_dir,
+ struct dentry *new_dentry);
+ int (*path_rename) (struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry);
+ int (*path_open) (struct dentry *dentry, struct vfsmount *mnt,
+ int flags);
+
int (*inode_alloc_security) (struct inode *inode);
void (*inode_free_security) (struct inode *inode);
int (*inode_init_security) (struct inode *inode, struct inode *dir,
@@ -1625,6 +1718,24 @@ void security_sb_clone_mnt_opts(const st
struct super_block *newsb);
int security_sb_parse_opts_str(char *options, struct security_mnt_opts *opts);
+int security_path_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd);
+int security_path_unlink(struct path *dir, struct dentry *dentry);
+int security_path_mkdir(struct path *dir, struct dentry *dentry, int mode);
+int security_path_rmdir(struct path *dir, struct dentry *dentry);
+int security_path_mknod(struct path *dir, struct dentry *dentry, int mode,
+ unsigned int dev);
+int security_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs, struct file *filp);
+int security_path_uselib(struct nameidata *nd);
+int security_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name);
+int security_path_link(struct path *old_path, struct path *new_dir,
+ struct dentry *new_dentry);
+int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry);
+int security_path_open(struct dentry *dentry, struct vfsmount *mnt, int flags);
+
int security_inode_alloc(struct inode *inode);
void security_inode_free(struct inode *inode);
int security_inode_init_security(struct inode *inode, struct inode *dir,
@@ -1950,6 +2061,73 @@ static inline int security_sb_parse_opts
return 0;
}
+static inline int security_path_create(struct inode *dir, struct dentry *dentry,
+ int mode, struct nameidata *nd)
+{
+ return 0;
+}
+static inline int security_path_unlink(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static inline int security_path_mkdir(struct path *dir, struct dentry *dentry,
+ int mode)
+{
+ return 0;
+}
+
+static inline int security_path_rmdir(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static inline int security_path_mknod(struct path *dir, struct dentry *dentry,
+ int mode, unsigned int dev)
+{
+ return 0;
+}
+
+static inline int security_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs,
+ struct file *filp)
+{
+ return 0;
+}
+
+static inline int security_path_uselib(struct nameidata *nd)
+{
+ return 0;
+}
+
+static inline int security_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name)
+{
+ return 0;
+}
+
+static inline int security_path_link(struct path *old_path,
+ struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static inline int security_path_rename(struct path *old_dir,
+ struct dentry *old_dentry,
+ struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static inline int security_path_open(struct dentry *dentry,
+ struct vfsmount *mnt,
+ int flags)
+{
+ return 0;
+}
+
static inline int security_inode_alloc (struct inode *inode)
{
return 0;
--- mm.orig/net/unix/af_unix.c
+++ mm/net/unix/af_unix.c
@@ -822,7 +822,11 @@ static int unix_bind(struct socket *sock
err = mnt_want_write(nd.path.mnt);
if (err)
goto out_mknod_dput;
+ err = security_path_mknod(&nd.path, dentry, mode, 0);
+ if (err)
+ goto out_drop_write;
err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0);
+out_drop_write:
mnt_drop_write(nd.path.mnt);
if (err)
goto out_mknod_dput;
--- mm.orig/security/dummy.c
+++ mm/security/dummy.c
@@ -270,6 +270,68 @@ static int dummy_sb_parse_opts_str(char
return 0;
}
+static int dummy_path_create(struct inode *inode, struct dentry *dentry,
+ int mask, struct nameidata *nd)
+{
+ return 0;
+}
+
+static int dummy_path_mknod(struct path *dir, struct dentry *dentry, int mode,
+ unsigned int dev)
+{
+ return 0;
+}
+
+static int dummy_path_mkdir(struct path *dir, struct dentry *dentry, int mode)
+{
+ return 0;
+}
+
+static int dummy_path_rmdir(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static int dummy_path_unlink(struct path *dir, struct dentry *dentry)
+{
+ return 0;
+}
+
+static int dummy_path_symlink(struct path *dir, struct dentry *dentry,
+ const char *old_name)
+{
+ return 0;
+}
+
+static int dummy_path_link(struct path *old_path, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static int dummy_path_rename(struct path *old_path, struct dentry *old_dentry,
+ struct path *new_path, struct dentry *new_dentry)
+{
+ return 0;
+}
+
+static int dummy_path_open(struct dentry *dentry, struct vfsmount *mnt,
+ int flags)
+{
+ return 0;
+}
+
+static int dummy_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs, struct file *filp)
+{
+ return 0;
+}
+
+static int dummy_path_uselib(struct nameidata *nd)
+{
+ return 0;
+}
+
static int dummy_inode_alloc_security (struct inode *inode)
{
return 0;
@@ -1079,6 +1141,17 @@ void security_fixup_ops (struct security
set_to_dummy_if_null(ops, sb_set_mnt_opts);
set_to_dummy_if_null(ops, sb_clone_mnt_opts);
set_to_dummy_if_null(ops, sb_parse_opts_str);
+ set_to_dummy_if_null(ops, path_create);
+ set_to_dummy_if_null(ops, path_mknod);
+ set_to_dummy_if_null(ops, path_mkdir);
+ set_to_dummy_if_null(ops, path_rmdir);
+ set_to_dummy_if_null(ops, path_unlink);
+ set_to_dummy_if_null(ops, path_symlink);
+ set_to_dummy_if_null(ops, path_link);
+ set_to_dummy_if_null(ops, path_rename);
+ set_to_dummy_if_null(ops, path_open);
+ set_to_dummy_if_null(ops, path_truncate);
+ set_to_dummy_if_null(ops, path_uselib);
set_to_dummy_if_null(ops, inode_alloc_security);
set_to_dummy_if_null(ops, inode_free_security);
set_to_dummy_if_null(ops, inode_init_security);
--- mm.orig/security/security.c
+++ mm/security/security.c
@@ -388,6 +388,69 @@ int security_inode_init_security(struct
}
EXPORT_SYMBOL(security_inode_init_security);
+int security_path_create(struct inode *dir, struct dentry *dentry, int mode,
+ struct nameidata *nd)
+{
+ if (unlikely(IS_PRIVATE(dir)))
+ return 0;
+ return security_ops->path_create(dir, dentry, mode, nd);
+}
+int security_path_mknod(struct path *path, struct dentry *dentry, int mode,
+ unsigned int dev)
+{
+ return security_ops->path_mknod(path, dentry, mode, dev);
+}
+
+int security_path_mkdir(struct path *path, struct dentry *dentry, int mode)
+{
+ return security_ops->path_mkdir(path, dentry, mode);
+}
+
+int security_path_rmdir(struct path *path, struct dentry *dentry)
+{
+ return security_ops->path_rmdir(path, dentry);
+}
+
+int security_path_unlink(struct path *path, struct dentry *dentry)
+{
+ return security_ops->path_unlink(path, dentry);
+}
+
+int security_path_symlink(struct path *path, struct dentry *dentry,
+ const char *old_name)
+{
+ return security_ops->path_symlink(path, dentry, old_name);
+}
+
+int security_path_link(struct path *old_path, struct path *new_dir,
+ struct dentry *new_dentry)
+{
+ return security_ops->path_link(old_path, new_dir, new_dentry);
+}
+
+int security_path_rename(struct path *old_dir, struct dentry *old_dentry,
+ struct path *new_dir, struct dentry *new_dentry)
+{
+ return security_ops->path_rename(old_dir, old_dentry, new_dir,
+ new_dentry);
+}
+
+int security_path_open(struct dentry *dentry, struct vfsmount *mnt, int flags)
+{
+ return security_ops->path_open(dentry, mnt, flags);
+}
+
+int security_path_truncate(struct path *path, loff_t length,
+ unsigned int time_attrs, struct file *filp)
+{
+ return security_ops->path_truncate(path, length, time_attrs, filp);
+}
+
+int security_path_uselib(struct nameidata *nd)
+{
+ return security_ops->path_uselib(nd);
+}
+
int security_inode_create(struct inode *dir, struct dentry *dentry, int mode)
{
if (unlikely(IS_PRIVATE(dir)))
--
--
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