linux-kernel - [PATCH 3/8] Simplify exec_permission

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Date:	Mon, 7 Sep 2009 14:03:08 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Linux Filesystem Mailing List <linux-fsdevel@...r.kernel.org>
cc:	Eric Paris <eparis@...hat.com>, Mimi Zohar <zohar@...ibm.com>,
	James Morris <jmorris@...ei.org>
Subject: [PATCH 3/8] Simplify exec_permission_lite() further


From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Fri, 28 Aug 2009 10:53:56 -0700

This function is only called for path components that are already known
to be directories (they have a '->lookup' method).  So don't bother
doing that whole S_ISDIR() testing, the whole point of the 'lite()'
version is that we know that we are looking at a directory component,
and that we're only checking name lookup permission.

Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
---
 fs/namei.c |    8 +-------
 1 files changed, 1 insertions(+), 7 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index bf8aa95..e39e5cb 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -445,13 +445,7 @@ static int exec_permission_lite(struct inode *inode)
 	if (mode & MAY_EXEC)
 		goto ok;
 
-	if ((inode->i_mode & S_IXUGO) && capable(CAP_DAC_OVERRIDE))
-		goto ok;
-
-	if (S_ISDIR(inode->i_mode) && capable(CAP_DAC_OVERRIDE))
-		goto ok;
-
-	if (S_ISDIR(inode->i_mode) && capable(CAP_DAC_READ_SEARCH))
+	if (capable(CAP_DAC_OVERRIDE) || capable(CAP_DAC_READ_SEARCH))
 		goto ok;
 
 	return -EACCES;
-- 
1.6.4.1.209.g74b8

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