tree b4f7c6d92ba68a6328c64d2ce28e48f9da99c78f
parent b99c2d913810e56682a538c9f2394d76fca808f8
author Vivek Goyal <vgoyal@redhat.com> 1467405265 -0400
committer Miklos Szeredi <mszeredi@redhat.com> 1467643788 +0200

ovl: Copy up underlying inode's ->i_mode to overlay inode

Right now when a new overlay inode is created, we initialize overlay
inode's ->i_mode from underlying inode ->i_mode but we retain only
file type bits (S_IFMT) and discard permission bits.

This patch changes it and retains permission bits too. This should allow
overlay to do permission checks on overlay inode itself in task context.

[SzM] It also fixes clearing suid/sgid bits on write.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reported-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Cc: <stable@vger.kernel.org>