1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
9 #include "alloc-util.h"
10 #include "dissect-image.h"
11 #include "errno-util.h"
14 int repeat_unmount(const char *path
, int flags
);
16 int umount_recursive_full(const char *target
, int flags
, char **keep
);
18 static inline int umount_recursive(const char *target
, int flags
) {
19 return umount_recursive_full(target
, flags
, NULL
);
22 int bind_remount_recursive_with_mountinfo(const char *prefix
, unsigned long new_flags
, unsigned long flags_mask
, char **deny_list
, FILE *proc_self_mountinfo
);
23 static inline int bind_remount_recursive(const char *prefix
, unsigned long new_flags
, unsigned long flags_mask
, char **deny_list
) {
24 return bind_remount_recursive_with_mountinfo(prefix
, new_flags
, flags_mask
, deny_list
, NULL
);
27 int bind_remount_one_with_mountinfo(const char *path
, unsigned long new_flags
, unsigned long flags_mask
, FILE *proc_self_mountinfo
);
29 int mount_switch_root_full(const char *path
, unsigned long mount_propagation_flag
, bool force_ms_move
);
30 static inline int mount_switch_root(const char *path
, unsigned long mount_propagation_flag
) {
31 return mount_switch_root_full(path
, mount_propagation_flag
, false);
34 DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(FILE*, endmntent
, NULL
);
35 #define _cleanup_endmntent_ _cleanup_(endmntentp)
37 int mount_verbose_full(
46 static inline int mount_follow_verbose(
52 const char *options
) {
53 return mount_verbose_full(error_log_level
, what
, where
, type
, flags
, options
, true);
56 static inline int mount_nofollow_verbose(
62 const char *options
) {
63 return mount_verbose_full(error_log_level
, what
, where
, type
, flags
, options
, false);
71 int mount_option_mangle(
73 unsigned long mount_flags
,
74 unsigned long *ret_mount_flags
,
75 char **ret_remaining_options
);
77 int mode_to_inaccessible_node(const char *runtime_dir
, mode_t mode
, char **dest
);
78 int mount_flags_to_string(unsigned long flags
, char **ret
);
80 /* Useful for usage with _cleanup_(), unmounts, removes a directory and frees the pointer */
81 static inline char* umount_and_rmdir_and_free(char *p
) {
84 (void) umount_recursive(p
, 0);
89 DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_rmdir_and_free
);
91 static inline char *umount_and_free(char *p
) {
94 (void) umount_recursive(p
, 0);
97 DEFINE_TRIVIAL_CLEANUP_FUNC(char*, umount_and_free
);
99 int bind_mount_in_namespace(pid_t target
, const char *propagate_path
, const char *incoming_path
, const char *src
, const char *dest
, bool read_only
, bool make_file_or_directory
);
100 int mount_image_in_namespace(pid_t target
, const char *propagate_path
, const char *incoming_path
, const char *src
, const char *dest
, bool read_only
, bool make_file_or_directory
, const MountOptions
*options
, const ImagePolicy
*image_policy
);
102 int make_mount_point(const char *path
);
103 int fd_make_mount_point(int fd
);
105 typedef enum RemountIdmapping
{
106 REMOUNT_IDMAPPING_NONE
,
107 /* Include a mapping from UID_MAPPED_ROOT (i.e. UID 2^31-2) on the backing fs to UID 0 on the
108 * uidmapped fs. This is useful to ensure that the host root user can safely add inodes to the
109 * uidmapped fs (which otherwise wouldn't work as the host root user is not defined on the uidmapped
110 * mount and any attempts to create inodes will then be refused with EOVERFLOW). The idea is that
111 * these inodes are quickly re-chown()ed to more suitable UIDs/GIDs. Any code that intends to be able
112 * to add inodes to file systems mapped this way should set this flag, but given it comes with
113 * certain security implications defaults to off, and requires explicit opt-in. */
114 REMOUNT_IDMAPPING_HOST_ROOT
,
115 /* Define a mapping from root user within the container to the owner of the bind mounted directory.
116 * This ensure no root-owned files will be written in a bind-mounted directory owned by a different
117 * user. No other users are mapped. */
118 REMOUNT_IDMAPPING_HOST_OWNER
,
119 _REMOUNT_IDMAPPING_MAX
,
120 _REMOUNT_IDMAPPING_INVALID
= -EINVAL
,
123 int make_userns(uid_t uid_shift
, uid_t uid_range
, uid_t owner
, RemountIdmapping idmapping
);
124 int remount_idmap_fd(const char *p
, int userns_fd
);
125 int remount_idmap(const char *p
, uid_t uid_shift
, uid_t uid_range
, uid_t owner
, RemountIdmapping idmapping
);
127 int remount_and_move_sub_mounts(
132 const char *options
);
133 int remount_sysfs(const char *where
);
135 /* Creates a mount point (not parents) based on the source path or stat - ie, a file or a directory */
136 int make_mount_point_inode_from_stat(const struct stat
*st
, const char *dest
, mode_t mode
);
137 int make_mount_point_inode_from_path(const char *source
, const char *dest
, mode_t mode
);