linux-kernel - [PATCH 1/7] ecryptfs: allow lower fs to interpret ATTR_KILL

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: <200709200910.l8K9AfBQ001328@dantu.rdu.redhat.com>
Date:	Thu, 20 Sep 2007 05:10:41 -0400
From:	Jeff Layton <jlayton@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	akpm@...ux-foundation.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 1/7] ecryptfs: allow lower fs to interpret ATTR_KILL_S*ID

Make sure ecryptfs doesn't trip the BUG() in notify_change. This also
allows the lower filesystem to interpret ATTR_KILL_S*ID in its own way.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/ecryptfs/inode.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/fs/ecryptfs/inode.c b/fs/ecryptfs/inode.c
index fc4c6cb..23a2fef 100644
--- a/fs/ecryptfs/inode.c
+++ b/fs/ecryptfs/inode.c
@@ -959,6 +959,14 @@ static int ecryptfs_setattr(struct dentry *dentry, struct iattr *ia)
 		if (rc < 0)
 			goto out;
 	}
+
+	/*
+	 * mode change is for clearing setuid/setgid bits. Allow lower fs
+	 * to interpret this in its own way.
+	 */
+	if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+		ia->ia_valid &= ~ATTR_MODE;
+
 	rc = notify_change(lower_dentry, ia);
 out:
 	fsstack_copy_attr_all(inode, lower_inode);
-- 
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/