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linux-sg2042
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Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 

Pull do_move_mount() fix from Al Viro:
 "Regression fix"

* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  vfs: move_mount: reject moving kernel internal mounts
This commit is contained in:
Linus Torvalds 2019-07-05 11:21:36 +09:00
parent c212ddaee2 570d7a98e7
commit 2cd7cdc7e4
1 changed files with 4 additions and 3 deletions
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7
fs/namespace.c
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@ -2596,11 +2596,12 @@ static int do_move_mount(struct path *old_path, struct path *new_path)
if (!check_mnt(p))
goto out;
/* The thing moved should be either ours or completely unattached. */
if (attached && !check_mnt(old))
/* The thing moved must be mounted... */
if (!is_mounted(&old->mnt))
goto out;
if (!attached && !(ns && is_anon_ns(ns)))
/* ... and either ours or the root of anon namespace */
if (!(attached ? check_mnt(old) : is_anon_ns(ns)))
goto out;
if (old->mnt.mnt_flags & MNT_LOCKED)