mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-27 20:07:09 +00:00
132c94e31b
As a matter of policy MNT_READONLY should not be changable if the original mounter had more privileges than creator of the mount namespace. Add the flag CL_UNPRIVILEGED to note when we are copying a mount from a mount namespace that requires more privileges to a mount namespace that requires fewer privileges. When the CL_UNPRIVILEGED flag is set cause clone_mnt to set MNT_NO_REMOUNT if any of the mnt flags that should never be changed are set. This protects both mount propagation and the initial creation of a less privileged mount namespace. Cc: stable@vger.kernel.org Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/*
|
|
* linux/fs/pnode.h
|
|
*
|
|
* (C) Copyright IBM Corporation 2005.
|
|
* Released under GPL v2.
|
|
*
|
|
*/
|
|
#ifndef _LINUX_PNODE_H
|
|
#define _LINUX_PNODE_H
|
|
|
|
#include <linux/list.h>
|
|
#include "mount.h"
|
|
|
|
#define IS_MNT_SHARED(m) ((m)->mnt.mnt_flags & MNT_SHARED)
|
|
#define IS_MNT_SLAVE(m) ((m)->mnt_master)
|
|
#define IS_MNT_NEW(m) (!(m)->mnt_ns)
|
|
#define CLEAR_MNT_SHARED(m) ((m)->mnt.mnt_flags &= ~MNT_SHARED)
|
|
#define IS_MNT_UNBINDABLE(m) ((m)->mnt.mnt_flags & MNT_UNBINDABLE)
|
|
|
|
#define CL_EXPIRE 0x01
|
|
#define CL_SLAVE 0x02
|
|
#define CL_COPY_ALL 0x04
|
|
#define CL_MAKE_SHARED 0x08
|
|
#define CL_PRIVATE 0x10
|
|
#define CL_SHARED_TO_SLAVE 0x20
|
|
#define CL_UNPRIVILEGED 0x40
|
|
|
|
static inline void set_mnt_shared(struct mount *mnt)
|
|
{
|
|
mnt->mnt.mnt_flags &= ~MNT_SHARED_MASK;
|
|
mnt->mnt.mnt_flags |= MNT_SHARED;
|
|
}
|
|
|
|
void change_mnt_propagation(struct mount *, int);
|
|
int propagate_mnt(struct mount *, struct dentry *, struct mount *,
|
|
struct list_head *);
|
|
int propagate_umount(struct list_head *);
|
|
int propagate_mount_busy(struct mount *, int);
|
|
void mnt_release_group_id(struct mount *);
|
|
int get_dominating_id(struct mount *mnt, const struct path *root);
|
|
unsigned int mnt_get_count(struct mount *mnt);
|
|
void mnt_set_mountpoint(struct mount *, struct dentry *,
|
|
struct mount *);
|
|
void release_mounts(struct list_head *);
|
|
void umount_tree(struct mount *, int, struct list_head *);
|
|
struct mount *copy_tree(struct mount *, struct dentry *, int);
|
|
bool is_path_reachable(struct mount *, struct dentry *,
|
|
const struct path *root);
|
|
#endif /* _LINUX_PNODE_H */
|