linux-kernel - [PATCH 2/6] procfs: Use generic_file

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Message-Id: <1269930015-863-3-git-send-regression-fweisbec@gmail.com>
Date:	Tue, 30 Mar 2010 08:20:11 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Kacur <jkacur@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Al Viro <viro@...IV.linux.org.uk>, Ingo Molnar <mingo@...e.hu>
Subject: [PATCH 2/6] procfs: Use generic_file_llseek in /proc/kcore

/proc/kcore has no llseek and then falls down to use default_llseek.
This is racy against read_kcore() that directly manipulates fpos
but it doesn't hold the bkl there so using it in llseek doesn't
protect anything.

Let's use generic_file_llseek() instead.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: John Kacur <jkacur@...hat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc: Al Viro <viro@...IV.linux.org.uk>
---
 fs/proc/kcore.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index a44a789..da21060 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -557,6 +557,7 @@ static int open_kcore(struct inode *inode, struct file *filp)
 static const struct file_operations proc_kcore_operations = {
 	.read		= read_kcore,
 	.open		= open_kcore,
+	.llseek		= generic_file_llseek,
 };
 
 #ifdef CONFIG_MEMORY_HOTPLUG
-- 
1.6.2.3

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