linux-kernel - [PATCH 2/3] NFS: ignore mode change if it's just for clearing setuid/setgid bits

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Message-Id: <200708301506.l7UF6mRM002138@dantu.rdu.redhat.com>
Date:	Thu, 30 Aug 2007 11:06:48 -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
Subject: [PATCH 2/3] NFS: 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 NFS skip the mode change and
let the server handle it.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/nfs/inode.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 45633f9..441bd8b 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -327,6 +327,10 @@ nfs_setattr(struct dentry *dentry, struct iattr *attr)
 
 	nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
 
+	/* skip mode change if it's just for clearing setuid/setgid */
+	if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+		attr->ia_valid &= ~ATTR_MODE;
+
 	if (attr->ia_valid & ATTR_SIZE) {
 		if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
 			attr->ia_valid &= ~ATTR_SIZE;
-- 
1.5.2.1

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