linux-kernel - [PATCH] anon_inodes: mark the anon inode private

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Date:	Tue,  9 Mar 2010 22:23:01 -0500
From:	Eric Paris <eparis@...hat.com>
To:	linux-kernel@...r.kernel.org, selinux@...ho.nsa.gov
Cc:	torvalds@...ux-foundation.org, sds@...ho.nsa.gov,
	viro@...IV.linux.org.uk, jmorris@...ei.org
Subject: [PATCH] anon_inodes: mark the anon inode private

Inotify was switched to use anon_inode instead of its own private filesystem
which only had one inode in commit c44dcc56d2b5c7 "switch inotify_user to
anon_inode"

The problem with this is that now the inotify inode is not a distinct inode
which can be managed by LSMs.  userspace tools which use inotify were allowed
to use the inotify inode but may not have had permission to do read/write type
operations on the anon_inode.  After looking at the anon_inode and its users
it looks like the best solution is to just mark the anon_inode as S_PRIVATE
so the security system will ignore it.

Signed-off-by: Eric Paris <eparis@...hat.com>
---
 fs/anon_inodes.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 9f0bf13..2de0095 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -209,6 +209,7 @@ static struct inode *anon_inode_mkinode(void)
 	inode->i_mode = S_IRUSR | S_IWUSR;
 	inode->i_uid = current_fsuid();
 	inode->i_gid = current_fsgid();
+	inode->i_flags |= S_PRIVATE;
 	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
 	return inode;
 }
-- 
1.6.5.3

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