linux-kernel - [PATCH] fs: make sure do_change

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Message-ID: <1277743282.31267.112.camel@sakura.staff.proxad.net>
Date:	Mon, 28 Jun 2010 18:41:22 +0200
From:	Maxime Bizon <mbizon@...ebox.fr>
To:	viro@...iv.linux.org.uk
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] fs: make sure do_change_type() gets a valid type.

Hi,

Busybox mount does not support --make-shared, and -o shared is used
instead. This has the side effect that MS_SILENT can be passed too, and
that prevents do_change_type() from working.

This patch fixes this by computing type using only relevant bits.

Signed-off-by: Maxime Bizon <mbizon@...ebox.fr>
---
 fs/namespace.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/namespace.c b/fs/namespace.c
index f20cb57..5360463 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1456,7 +1456,7 @@ static int do_change_type(struct path *path, int flag)
 {
 	struct vfsmount *m, *mnt = path->mnt;
 	int recurse = flag & MS_REC;
-	int type = flag & ~MS_REC;
+	int type = flag & (MS_SHARED | MS_PRIVATE | MS_SLAVE | MS_UNBINDABLE);
 	int err = 0;

 	if (!capable(CAP_SYS_ADMIN))
-- 
1.7.1

-- 
Maxime

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