linux-kernel - [PATCH 7/7] CIFS: ignore mode change if it's just for clearing setuid/setgid bits

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Message-Id: <200709101452.l8AEqqse016299@dantu.rdu.redhat.com>
Date:	Mon, 10 Sep 2007 10:52:52 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	linux-cifs-client@...ts.samba.org, nfs@...ts.sourceforge.net,
	ecryptfs-devel@...ts.sourceforge.net,
	reiserfs-devel@...r.kernel.org, unionfs@...esystems.org
Subject: [PATCH 7/7] CIFS: ignore mode change if it's just for clearing setuid/setgid bits

If the ATTR_KILL_S*ID bits are set then any mode change is only for
clearing the setuid/setgid bits. For CIFS, skip the mode change and
let the server handle it.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/cifs/inode.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 66436f5..8fa3d63 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1547,6 +1547,11 @@ int cifs_setattr(struct dentry *direntry, struct iattr *attrs)
 	}
 
 	time_buf.Attributes = 0;
+
+	/* skip mode change if it's just for clearing setuid/setgid */
+	if (attrs->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
+		attrs->ia_valid &= ~ATTR_MODE;
+
 	if (attrs->ia_valid & ATTR_MODE) {
 		cFYI(1, ("Mode changed to 0x%x", attrs->ia_mode));
 		mode = attrs->ia_mode;
-- 
1.5.2.1

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