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| author | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-21 14:19:47 +0100 |
|---|---|---|
| committer | Christian Brauner <christian.brauner@ubuntu.com> | 2021-01-24 14:27:20 +0100 |
| commit | 029a52ada6a774cac457f3be34b79cfc85563ced (patch) | |
| tree | 394e9f50ee0b0725d462e64d785c24a9225bf9d9 /fs/overlayfs | |
| parent | 0f16ff0f545d5ec90bbd548afd2983785b546780 (diff) | |
| download | linux-stable-029a52ada6a774cac457f3be34b79cfc85563ced.tar.gz linux-stable-029a52ada6a774cac457f3be34b79cfc85563ced.tar.bz2 linux-stable-029a52ada6a774cac457f3be34b79cfc85563ced.zip | |
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.c | 4 |
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; |