linux-kernel - [GIT PULL] Revert "dlm: check the maximum size of a request from user"

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Date:	Mon, 4 Feb 2013 12:06:55 -0500
From:	David Teigland <teigland@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Sasha Levin <levinsasha928@...il.com>
Subject: [GIT PULL] Revert "dlm: check the maximum size of a request from
 user"

Hi Linus,

Please pull the following fix from branch:

git://git.kernel.org/pub/scm/linux/kernel/git/teigland/linux-dlm.git for-linus

This reverts commit 2b75bc9121e54e22537207b47b71373bcb0be41c.

There is something wrong with the CONFIG_COMPAT max size
check in ioctl write.  There is a report of a case where
this breaks userland (clvmd) when maximum resource name
lengths are used.  I am still sorting out exactly which
combinations of kernel and userland libs are a problem.

Reported-by: Jana Saout <jana@...ut.de>
CC: Sasha Levin <levinsasha928@...il.com>
Signed-off-by: David Teigland <teigland@...hat.com>
---
 fs/dlm/user.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/fs/dlm/user.c b/fs/dlm/user.c
index 7ff4985..eb4ed9b 100644
--- a/fs/dlm/user.c
+++ b/fs/dlm/user.c
@@ -503,13 +503,6 @@ static ssize_t device_write(struct file *file, const char __user *buf,
 #endif
 		return -EINVAL;
 
-#ifdef CONFIG_COMPAT
-	if (count > sizeof(struct dlm_write_request32) + DLM_RESNAME_MAXLEN)
-#else
-	if (count > sizeof(struct dlm_write_request) + DLM_RESNAME_MAXLEN)
-#endif
-		return -EINVAL;
-
 	kbuf = kzalloc(count + 1, GFP_NOFS);
 	if (!kbuf)
 		return -ENOMEM;
-- 
1.8.1.rc1.5.g7e0651a

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