Default ACL is not inherited on overlayfs. e.g.
umask 022
mkdir /mnt/overlay/acltestdir
setfacl -d --set u::rwx,g::rwx,o::- /mnt/overlay/acltestdir
mkdir /mnt/overlay/acltestdir/subdir
getfacl -p /mnt/overlay/acltestdir/subdir
subdir should inherit the default acl from acltestdir, which is
u::rwx,g::rwx,o::-, but subdir has mode specified by umask instead.
xfstests generic/314 and generic/319 reveal this issue.
Fix it by setting MS_POSIXACL flag overlayfs superblock to avoid setting
mode according to umask, then moving the POSIX ACL handling to overlayfs.
Signed-off-by: Eryu Guan <guane...@gmail.com>
---
fs/overlayfs/dir.c | 22 ++++++++++++++--------
fs/overlayfs/super.c | 7 +++++++
2 files changed, 21 insertions(+), 8 deletions(-)
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 692ceda..8b763c2 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -387,20 +387,26 @@ static int ovl_create_or_link(struct dentry *dentry, int
mode, dev_t rdev,
{
int err;
struct inode *inode;
- struct kstat stat = {
- .mode = mode,
- .rdev = rdev,
- };
+ struct dentry *upperdir;
+ struct kstat stat;
+
+ err = ovl_copy_up(dentry->d_parent);
+ if (err)
+ goto out;
+
+ /* Check POSIX ACL support against upper layer */
+ upperdir = ovl_dentry_upper(dentry->d_parent);
+ if (!IS_POSIXACL(d_inode(upperdir)))
+ mode &= ~current_umask();
+
+ stat.mode = mode;
+ stat.rdev = rdev;
err = -ENOMEM;
inode = ovl_new_inode(dentry->d_sb, mode, dentry->d_fsdata);
if (!inode)
goto out;
- err = ovl_copy_up(dentry->d_parent);
- if (err)
- goto out_iput;
-
if (!ovl_dentry_is_opaque(dentry)) {
err = ovl_create_upper(dentry, inode, &stat, link, hardlink);
} else {
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e38ee0f..1cf923c 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1024,6 +1024,13 @@ static int ovl_fill_super(struct super_block *sb, void
*data, int silent)
if (!ufs->upper_mnt)
sb->s_flags |= MS_RDONLY;
+ /*
+ * Set MS_POSIXACL unconditionally, so file mode won't be set according
+ * to umask in vfs layer, POSIX ACL support and new file mode will be
+ * handled in overlayfs.
+ */
+ sb->s_flags |= MS_POSIXACL;
+
if (remote)
sb->s_d_op = &ovl_reval_dentry_operations;
else
--
1.8.3.1
--
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