lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-Id: <200709041437.l84EbYPb010022@dantu.rdu.redhat.com>
Date:	Tue, 4 Sep 2007 10:37:34 -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 5/7] knfsd: only set ATTR_KILL_S*ID if ATTR_MODE isn't being explicitly set

It's theoretically possible for a single SETATTR call to come in that
sets the mode and the uid/gid. In that case, assume the mode is
correct and don't set the ATTR_KILL_S*ID bits. Doing so would trip the
BUG() in notify_change.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/nfsd/vfs.c |   17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 70f2c86..3b5b8cf 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -369,14 +369,19 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
 	if (iap->ia_valid & ATTR_MODE) {
 		iap->ia_mode &= S_IALLUGO;
 		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
+		if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
+			iap->ia_valid |= ATTR_KILL_PRIV;
+	} else {
+		/*
+		 * Revoke setuid/setgid bit on chown/chgrp, unless the mode
+		 * is being explicitly set
+		 */
+		if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
+			iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV;
+		if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
+			iap->ia_valid |= ATTR_KILL_SGID;
 	}
 
-	/* Revoke setuid/setgid bit on chown/chgrp */
-	if ((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid)
-		iap->ia_valid |= ATTR_KILL_SUID | ATTR_KILL_PRIV;
-	if ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)
-		iap->ia_valid |= ATTR_KILL_SGID;
-
 	/* Change the attributes. */
 
 	iap->ia_valid |= ATTR_CTIME;
-- 
1.5.2.1

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ