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

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commit 07a2daab49 upstream.

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: 4bacc9c923 ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Vivek Goyal 2016-07-01 16:34:25 -04:00 • committed by Greg Kroah-Hartman

parent e9a2ce2a68

commit c12dada5f2

2 changed files with 2 additions and 2 deletions

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3

fs/overlayfs/inode.c

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1

fs/overlayfs/overlayfs.h

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