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authorChristian Brauner <christian.brauner@ubuntu.com>2021-01-21 14:19:47 +0100
committerChristian Brauner <christian.brauner@ubuntu.com>2021-01-24 14:27:20 +0100
commit029a52ada6a774cac457f3be34b79cfc85563ced (patch)
tree394e9f50ee0b0725d462e64d785c24a9225bf9d9 /fs/overlayfs
parent0f16ff0f545d5ec90bbd548afd2983785b546780 (diff)
downloadlinux-029a52ada6a774cac457f3be34b79cfc85563ced.tar.bz2
overlayfs: do not mount on top of idmapped mounts
Prevent overlayfs from being mounted on top of idmapped mounts. Stacking filesystems need to be prevented from being mounted on top of idmapped mounts until they have have been converted to handle this. Link: https://lore.kernel.org/r/20210121131959.646623-29-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: James Morris <jamorris@linux.microsoft.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/super.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index c04612b19054..b702c576e783 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -858,6 +858,10 @@ static int ovl_mount_dir_noesc(const char *name, struct path *path)
pr_err("filesystem on '%s' not supported\n", name);
goto out_put;
}
+ if (mnt_user_ns(path->mnt) != &init_user_ns) {
+ pr_err("idmapped layers are currently not supported\n");
+ goto out_put;
+ }
if (!d_is_dir(path->dentry)) {
pr_err("'%s' not a directory\n", name);
goto out_put;