[PATCH (for 3.15) 2/5] SELinux: Handle the rename flags.

[Tetsuo Handa]

>From 39e4aea3b42b53d844c87f6c7e54f0a9837ebbfd Mon Sep 17 00:00:00 2001
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Date: Mon, 12 May 2014 21:34:36 +0900
Subject: [PATCH (for 3.15) 2/5] SELinux: Handle the rename flags.

For SELinux, the RENAME_EXCHANGE flag means "check permissions with
reversed arguments".

Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
---
 security/selinux/hooks.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 33f6f56..64d8497 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2752,7 +2752,10 @@ static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dent
 				struct inode *new_inode, struct dentry *new_dentry,
 				unsigned int flags)
 {
-	return may_rename(old_inode, old_dentry, new_inode, new_dentry);
+	int err = may_rename(old_inode, old_dentry, new_inode, new_dentry);
+	if (!err && (flags & RENAME_EXCHANGE))
+		err = may_rename(new_inode, new_dentry, old_inode, old_dentry);
+	return err;
 }
 
 static int selinux_inode_readlink(struct dentry *dentry)
-- 
1.7.1
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