The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 708fa01597fa002599756bf56a96d0de1677375c Mon Sep 17 00:00:00 2001

From: Miklos Szeredi mszeredi@redhat.com Date: Mon, 12 Apr 2021 12:00:37 +0200 Subject: [PATCH] ovl: allow upperdir inside lowerdir

Commit 146d62e5a586 ("ovl: detect overlapping layers") made sure we don't have overlapping layers, but it also broke the arguably valid use case of

mount -olowerdir=/,upperdir=/subdir,..

where upperdir overlaps lowerdir on the same filesystem. This has been causing regressions.

Revert the check, but only for the specific case where upperdir and/or workdir are subdirectories of lowerdir. Any other overlap (e.g. lowerdir is subdirectory of upperdir, etc) case is crazy, so leave the check in place for those.

Overlaps are detected at lookup time too, so reverting the mount time check should be safe.

Fixes: 146d62e5a586 ("ovl: detect overlapping layers") Cc: stable@vger.kernel.org # v5.2 Signed-off-by: Miklos Szeredi mszeredi@redhat.com

diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index a33b31bf7e05..b01d4147520d 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -1854,7 +1854,8 @@ static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb, * - upper/work dir of any overlayfs instance */ static int ovl_check_layer(struct super_block *sb, struct ovl_fs *ofs, - struct dentry *dentry, const char *name) + struct dentry *dentry, const char *name, + bool is_lower) { struct dentry *next = dentry, *parent; int err = 0; @@ -1866,7 +1867,7 @@ static int ovl_check_layer(struct super_block *sb, struct ovl_fs *ofs,

/* Walk back ancestors to root (inclusive) looking for traps */ while (!err && parent != next) { - if (ovl_lookup_trap_inode(sb, parent)) { + if (is_lower && ovl_lookup_trap_inode(sb, parent)) { err = -ELOOP; pr_err("overlapping %s path\n", name); } else if (ovl_is_inuse(parent)) { @@ -1892,7 +1893,7 @@ static int ovl_check_overlapping_layers(struct super_block *sb,

if (ovl_upper_mnt(ofs)) { err = ovl_check_layer(sb, ofs, ovl_upper_mnt(ofs)->mnt_root, - "upperdir"); + "upperdir", false); if (err) return err;

@@ -1903,7 +1904,8 @@ static int ovl_check_overlapping_layers(struct super_block *sb, * workbasedir. In that case, we already have their traps in * inode cache and we will catch that case on lookup. */ - err = ovl_check_layer(sb, ofs, ofs->workbasedir, "workdir"); + err = ovl_check_layer(sb, ofs, ofs->workbasedir, "workdir", + false); if (err) return err; } @@ -1911,7 +1913,7 @@ static int ovl_check_overlapping_layers(struct super_block *sb, for (i = 1; i < ofs->numlayer; i++) { err = ovl_check_layer(sb, ofs, ofs->layers[i].mnt->mnt_root, - "lowerdir"); + "lowerdir", true); if (err) return err; }