linux-kernel - [PATCH 4/4] Annotate struct fs_struct's usage count restriction

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Message-ID: <Pine.LNX.4.64.0903282321390.15432@blonde.anvils>
Date:	Sat, 28 Mar 2009 23:23:01 +0000 (GMT)
From:	Hugh Dickins <hugh@...itas.com>
To:	Al Viro <viro@...iv.linux.org.uk>
cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joe Malicki <jmalicki@...acarta.com>,
	Michael Itz <mitz@...acarta.com>,
	Kenneth Baker <bakerk@...acarta.com>,
	Chris Wright <chrisw@...s-sol.org>,
	David Howells <dhowells@...hat.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] Annotate struct fs_struct's usage count restriction

From: David Howells <dhowells@...hat.com>

Annotate struct fs_struct's usage count to indicate the restrictions upon it.
It may not be incremented, except by clone(CLONE_FS), as this affects the
check in check_unsafe_exec() in fs/exec.c.

Signed-off-by: David Howells <dhowells@...hat.com>
Signed-off-by: Hugh Dickins <hugh@...itas.com>
Cc: stable@...nel.org
---

 include/linux/fs_struct.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- 2.6.29/include/linux/fs_struct.h	2009-03-23 23:12:14.000000000 +0000
+++ linux/include/linux/fs_struct.h	2009-03-28 18:06:02.000000000 +0000
@@ -4,7 +4,10 @@
 #include <linux/path.h>
 
 struct fs_struct {
-	atomic_t count;
+	atomic_t count;	/* This usage count is used by check_unsafe_exec() for
+			 * security checking purposes - therefore it may not be
+			 * incremented, except by clone(CLONE_FS).
+			 */
 	rwlock_t lock;
 	int umask;
 	struct path root, pwd;
--
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