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current_chrooted(): don't bother with follow_down_one()

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All we need here is to follow ->overmount on root mount of namespace...

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2025-07-02 01:39:45 -04:00
parent 2aec880c1c
commit 6b6516c56b
1 changed files with 9 additions and 11 deletions
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20
fs/namespace.c
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@@ -6194,24 +6194,22 @@ bool our_mnt(struct vfsmount *mnt)
bool current_chrooted(void)
{
/* Does the current process have a non-standard root */
struct path ns_root;
struct mount *root = current->nsproxy->mnt_ns->root;
struct path fs_root;
bool chrooted;
/* Find the namespace root */
ns_root.mnt = &current->nsproxy->mnt_ns->root->mnt;
ns_root.dentry = ns_root.mnt->mnt_root;
path_get(&ns_root);
while (d_mountpoint(ns_root.dentry) && follow_down_one(&ns_root))
;
get_fs_root(current->fs, &fs_root);
chrooted = !path_equal(&fs_root, &ns_root);
/* Find the namespace root */
read_seqlock_excl(&mount_lock);
while (unlikely(root->overmount))
root = root->overmount;
chrooted = fs_root.mnt != &root->mnt || !path_mounted(&fs_root);
read_sequnlock_excl(&mount_lock);
path_put(&fs_root);
path_put(&ns_root);
return chrooted;
}