[apparmor] [PATCH 7/7] lsm: Remove security_sb_mount and security_move_mount
Song Liu
song at kernel.org
Wed Mar 18 18:44:00 UTC 2026
Now that all LSMs have been converted to granular mount hooks,
remove the old hooks:
- security_sb_mount(): removed from lsm_hook_defs.h, security.h,
security.c, and its call in path_mount().
- security_move_mount(): removed and replaced by security_mount_move()
in do_move_mount(). All LSMs now use mount_move exclusively.
Code generated with the assistance of Claude, reviewed by human.
Signed-off-by: Song Liu <song at kernel.org>
---
fs/namespace.c | 6 +-----
include/linux/lsm_hook_defs.h | 4 ----
include/linux/security.h | 16 ---------------
kernel/bpf/bpf_lsm.c | 2 --
security/apparmor/lsm.c | 1 -
security/landlock/fs.c | 1 -
security/security.c | 38 -----------------------------------
security/selinux/hooks.c | 2 --
8 files changed, 1 insertion(+), 69 deletions(-)
diff --git a/fs/namespace.c b/fs/namespace.c
index de33070e514a..ba5baccdde67 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -4108,7 +4108,6 @@ int path_mount(const char *dev_name, const struct path *path,
const char *type_page, unsigned long flags, void *data_page)
{
unsigned int mnt_flags = 0, sb_flags;
- int ret;
/* Discard magic */
if ((flags & MS_MGC_MSK) == MS_MGC_VAL)
@@ -4121,9 +4120,6 @@ int path_mount(const char *dev_name, const struct path *path,
if (flags & MS_NOUSER)
return -EINVAL;
- ret = security_sb_mount(dev_name, path, type_page, flags, data_page);
- if (ret)
- return ret;
if (!may_mount())
return -EPERM;
if (flags & SB_MANDLOCK)
@@ -4538,7 +4534,7 @@ static inline int vfs_move_mount(const struct path *from_path,
{
int ret;
- ret = security_move_mount(from_path, to_path);
+ ret = security_mount_move(from_path, to_path);
if (ret)
return ret;
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index 6bb67059fb43..95537574c40b 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -69,8 +69,6 @@ LSM_HOOK(int, 0, sb_remount, struct super_block *sb, void *mnt_opts)
LSM_HOOK(int, 0, sb_kern_mount, const struct super_block *sb)
LSM_HOOK(int, 0, sb_show_options, struct seq_file *m, struct super_block *sb)
LSM_HOOK(int, 0, sb_statfs, struct dentry *dentry)
-LSM_HOOK(int, 0, sb_mount, const char *dev_name, const struct path *path,
- const char *type, unsigned long flags, void *data)
LSM_HOOK(int, 0, sb_umount, struct vfsmount *mnt, int flags)
LSM_HOOK(int, 0, sb_pivotroot, const struct path *old_path,
const struct path *new_path)
@@ -79,8 +77,6 @@ LSM_HOOK(int, 0, sb_set_mnt_opts, struct super_block *sb, void *mnt_opts,
LSM_HOOK(int, 0, sb_clone_mnt_opts, const struct super_block *oldsb,
struct super_block *newsb, unsigned long kern_flags,
unsigned long *set_kern_flags)
-LSM_HOOK(int, 0, move_mount, const struct path *from_path,
- const struct path *to_path)
LSM_HOOK(int, 0, mount_bind, const struct path *from, const struct path *to,
bool recurse)
LSM_HOOK(int, 0, mount_new, struct fs_context *fc, const struct path *mp,
diff --git a/include/linux/security.h b/include/linux/security.h
index 6e31de9b3d68..3610a49304c6 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -372,8 +372,6 @@ int security_sb_remount(struct super_block *sb, void *mnt_opts);
int security_sb_kern_mount(const struct super_block *sb);
int security_sb_show_options(struct seq_file *m, struct super_block *sb);
int security_sb_statfs(struct dentry *dentry);
-int security_sb_mount(const char *dev_name, const struct path *path,
- const char *type, unsigned long flags, void *data);
int security_sb_umount(struct vfsmount *mnt, int flags);
int security_sb_pivotroot(const struct path *old_path, const struct path *new_path);
int security_sb_set_mnt_opts(struct super_block *sb,
@@ -384,7 +382,6 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb,
unsigned long kern_flags,
unsigned long *set_kern_flags);
-int security_move_mount(const struct path *from_path, const struct path *to_path);
int security_mount_bind(const struct path *from, const struct path *to,
bool recurse);
int security_mount_new(struct fs_context *fc, const struct path *mp,
@@ -818,13 +815,6 @@ static inline int security_sb_statfs(struct dentry *dentry)
return 0;
}
-static inline int security_sb_mount(const char *dev_name, const struct path *path,
- const char *type, unsigned long flags,
- void *data)
-{
- return 0;
-}
-
static inline int security_sb_umount(struct vfsmount *mnt, int flags)
{
return 0;
@@ -852,12 +842,6 @@ static inline int security_sb_clone_mnt_opts(const struct super_block *oldsb,
return 0;
}
-static inline int security_move_mount(const struct path *from_path,
- const struct path *to_path)
-{
- return 0;
-}
-
static inline int security_mount_bind(const struct path *from,
const struct path *to, bool recurse)
{
diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
index 65235d70ee23..3e61c54f9b48 100644
--- a/kernel/bpf/bpf_lsm.c
+++ b/kernel/bpf/bpf_lsm.c
@@ -350,7 +350,6 @@ BTF_ID(func, bpf_lsm_release_secctx)
BTF_ID(func, bpf_lsm_sb_alloc_security)
BTF_ID(func, bpf_lsm_sb_eat_lsm_opts)
BTF_ID(func, bpf_lsm_sb_kern_mount)
-BTF_ID(func, bpf_lsm_sb_mount)
BTF_ID(func, bpf_lsm_sb_remount)
BTF_ID(func, bpf_lsm_sb_set_mnt_opts)
BTF_ID(func, bpf_lsm_sb_show_options)
@@ -383,7 +382,6 @@ BTF_ID(func, bpf_lsm_task_prctl)
BTF_ID(func, bpf_lsm_task_setscheduler)
BTF_ID(func, bpf_lsm_task_to_inode)
BTF_ID(func, bpf_lsm_userns_create)
-BTF_ID(func, bpf_lsm_move_mount)
BTF_ID(func, bpf_lsm_mount_bind)
BTF_ID(func, bpf_lsm_mount_new)
BTF_ID(func, bpf_lsm_mount_remount)
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 7fe774535992..13a8049b1b59 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1713,7 +1713,6 @@ static struct security_hook_list apparmor_hooks[] __ro_after_init = {
LSM_HOOK_INIT(capget, apparmor_capget),
LSM_HOOK_INIT(capable, apparmor_capable),
- LSM_HOOK_INIT(move_mount, apparmor_move_mount),
LSM_HOOK_INIT(mount_bind, apparmor_mount_bind),
LSM_HOOK_INIT(mount_new, apparmor_mount_new),
LSM_HOOK_INIT(mount_remount, apparmor_mount_remount),
diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index 6e810550efcb..5f723a70baa4 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -1857,7 +1857,6 @@ static struct security_hook_list landlock_hooks[] __ro_after_init = {
LSM_HOOK_INIT(mount_reconfigure, hook_mount_reconfigure),
LSM_HOOK_INIT(mount_change_type, hook_mount_change_type),
LSM_HOOK_INIT(mount_move, hook_move_mount),
- LSM_HOOK_INIT(move_mount, hook_move_mount),
LSM_HOOK_INIT(sb_umount, hook_sb_umount),
LSM_HOOK_INIT(sb_remount, hook_sb_remount),
LSM_HOOK_INIT(sb_pivotroot, hook_sb_pivotroot),
diff --git a/security/security.c b/security/security.c
index 356ef228d5de..af95868af34d 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1039,29 +1039,6 @@ int security_sb_statfs(struct dentry *dentry)
return call_int_hook(sb_statfs, dentry);
}
-/**
- * security_sb_mount() - Check permission for mounting a filesystem
- * @dev_name: filesystem backing device
- * @path: mount point
- * @type: filesystem type
- * @flags: mount flags
- * @data: filesystem specific data
- *
- * Check permission before an object specified by @dev_name is mounted on the
- * mount point named by @nd. For an ordinary mount, @dev_name identifies a
- * device if the file system type requires a device. For a remount
- * (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
- * (@flags & MS_BIND), @dev_name identifies the pathname of the object being
- * mounted.
- *
- * Return: Returns 0 if permission is granted.
- */
-int security_sb_mount(const char *dev_name, const struct path *path,
- const char *type, unsigned long flags, void *data)
-{
- return call_int_hook(sb_mount, dev_name, path, type, flags, data);
-}
-
/**
* security_sb_umount() - Check permission for unmounting a filesystem
* @mnt: mounted filesystem
@@ -1141,21 +1118,6 @@ int security_sb_clone_mnt_opts(const struct super_block *oldsb,
}
EXPORT_SYMBOL(security_sb_clone_mnt_opts);
-/**
- * security_move_mount() - Check permissions for moving a mount
- * @from_path: source mount point
- * @to_path: destination mount point
- *
- * Check permission before a mount is moved.
- *
- * Return: Returns 0 if permission is granted.
- */
-int security_move_mount(const struct path *from_path,
- const struct path *to_path)
-{
- return call_int_hook(move_mount, from_path, to_path);
-}
-
/**
* security_mount_bind() - Check permissions for a bind mount
* @from: source path
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 415b5541ab9e..446e9e242134 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7477,8 +7477,6 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = {
LSM_HOOK_INIT(sb_set_mnt_opts, selinux_set_mnt_opts),
LSM_HOOK_INIT(sb_clone_mnt_opts, selinux_sb_clone_mnt_opts),
- LSM_HOOK_INIT(move_mount, selinux_move_mount),
-
LSM_HOOK_INIT(dentry_init_security, selinux_dentry_init_security),
LSM_HOOK_INIT(dentry_create_files_as, selinux_dentry_create_files_as),
--
2.52.0
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