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vfs: syscall: Add move_mount(2) to move mounts around

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Add a move_mount() system call that will move a mount from one place to
another and, in the next commit, allow to attach an unattached mount tree.

The new system call looks like the following:

	int move_mount(int from_dfd, const char *from_path,
		       int to_dfd, const char *to_path,
		       unsigned int flags);

Signed-off-by: David Howells <dhowells@redhat.com>
cc: linux-api@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
David Howells 2018-11-05 17:40:30 +00:00 • committed by Al Viro
parent a07b200047
commit 2db154b3ea
8 changed files with 131 additions and 33 deletions
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6
include/linux/lsm_hooks.h
View file

@ -160,6 +160,10 @@
* Parse a string of security data filling in the opts structure
* @options string containing all mount options known by the LSM
* @opts binary data structure usable by the LSM
* @move_mount:
* Check permission before a mount is moved.
* @from_path indicates the mount that is going to be moved.
* @to_path indicates the mountpoint that will be mounted upon.
* @dentry_init_security:
* Compute a context for a dentry as the inode is not yet available
* since NFSv4 has no label backed by an EA anyway.
@ -1501,6 +1505,7 @@ union security_list_options {
unsigned long *set_kern_flags);
int (*sb_add_mnt_opt)(const char *option, const char *val, int len,
void **mnt_opts);
int (*move_mount)(const struct path *from_path, const struct path *to_path);
int (*dentry_init_security)(struct dentry *dentry, int mode,
const struct qstr *name, void **ctx,
u32 *ctxlen);
@ -1835,6 +1840,7 @@ struct security_hook_heads {
struct hlist_head sb_set_mnt_opts;
struct hlist_head sb_clone_mnt_opts;
struct hlist_head sb_add_mnt_opt;
struct hlist_head move_mount;
struct hlist_head dentry_init_security;
struct hlist_head dentry_create_files_as;
#ifdef CONFIG_SECURITY_PATH