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From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: xfs <linux-xfs@vger.kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Dave Chinner <david@fromorbit.com>,
	Salvatore Bonaccorso <carnil@debian.org>,
	Security Officers <security@kernel.org>,
	Debian Security Team <team@security.debian.org>,
	benjamin.moody@gmail.com, Ben Hutchings <benh@debian.org>,
	Christoph Hellwig <hch@infradead.org>
Subject: [PATCH] xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails due to EDQUOT
Date: Thu, 22 Aug 2019 20:55:28 -0700
Message-ID: <20190823035528.GH1037422@magnolia> (raw)

From: Darrick J. Wong <darrick.wong@oracle.com>

Benjamin Moody reported to Debian that XFS partially wedges when a chgrp
fails on account of being out of disk quota.  I ran his reproducer
script:

# adduser dummy
# adduser dummy plugdev

# dd if=/dev/zero bs=1M count=100 of=test.img
# mkfs.xfs test.img
# mount -t xfs -o gquota test.img /mnt
# mkdir -p /mnt/dummy
# chown -c dummy /mnt/dummy
# xfs_quota -xc 'limit -g bsoft=100k bhard=100k plugdev' /mnt

(and then as user dummy)

$ dd if=/dev/urandom bs=1M count=50 of=/mnt/dummy/foo
$ chgrp plugdev /mnt/dummy/foo

and saw:

================================================
WARNING: lock held when returning to user space!
5.3.0-rc5 #rc5 Tainted: G        W
------------------------------------------------
chgrp/47006 is leaving the kernel with locks still held!
1 lock held by chgrp/47006:
 #0: 000000006664ea2d (&xfs_nondir_ilock_class){++++}, at: xfs_ilock+0xd2/0x290 [xfs]

...which is clearly caused by xfs_setattr_nonsize failing to unlock the
ILOCK after the xfs_qm_vop_chown_reserve call fails.  Add the missing
unlock.

Reported-by: benjamin.moody@gmail.com
Fixes: 253f4911f297 ("xfs: better xfs_trans_alloc interface")
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 fs/xfs/xfs_iops.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index dd4076ae228a..ea614b4ae052 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -804,6 +804,7 @@ xfs_setattr_nonsize(
 
 out_cancel:
 	xfs_trans_cancel(tp);
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
 out_dqrele:
 	xfs_qm_dqrele(udqp);
 	xfs_qm_dqrele(gdqp);

             reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-23  3:55 Darrick J. Wong [this message]
2019-08-23  3:57 ` [PATCH] generic: test for failure to unlock inode after chgrp fails with EDQUOT Darrick J. Wong
2019-08-24 23:05   ` Christoph Hellwig
2019-08-23  4:55 ` [PATCH] xfs: fix missing ILOCK unlock when xfs_setattr_nonsize fails due to EDQUOT Dave Chinner
2019-08-23 16:28 ` Linus Torvalds
2019-08-23 17:15   ` Benjamin Moody
2019-08-23 19:26   ` Salvatore Bonaccorso
2019-08-24 18:22     ` Salvatore Bonaccorso
2019-08-23 19:24 ` Salvatore Bonaccorso
2019-08-24 18:44   ` Linus Torvalds
2019-08-25  3:13     ` Greg KH
2019-08-25 15:45       ` Salvatore Bonaccorso

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