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fs: add KernelSU umount compatibility helpers

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This commit is contained in:
Nicholas Andrew 2026-09-18 19:56:56 -04:00
commit 14cfb1b990
1 changed files with 37 additions and 0 deletions
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37
fs/namespace.c
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@ -1756,6 +1756,43 @@ SYSCALL_DEFINE1(oldumount, char __user *, name)
#endif
static int can_umount(const struct path *path, int flags)
{
struct mount *mnt = real_mount(path->mnt);
if (flags & ~(MNT_FORCE | MNT_DETACH | MNT_EXPIRE | UMOUNT_NOFOLLOW))
return -EINVAL;
if (!may_mount())
return -EPERM;
if (path->dentry != path->mnt->mnt_root)
return -EINVAL;
if (!check_mnt(mnt))
return -EINVAL;
if (mnt->mnt.mnt_flags & MNT_LOCKED)
return -EINVAL;
if (flags & MNT_FORCE && !capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
int path_umount(struct path *path, int flags)
{
struct mount *mnt = real_mount(path->mnt);
int ret;
ret = can_umount(path, flags);
if (!ret)
ret = do_umount(mnt, flags);
dput(path->dentry);
mntput_no_expire(mnt);
return ret;
}
static bool is_mnt_ns_file(struct dentry *dentry)
{
/* Is this a proxy for a mount namespace? */