xfs: make sure the kernel and repair tools catch bad names
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Message ID 20191029222948.GA15224@magnolia
State New
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  • xfs: make sure the kernel and repair tools catch bad names
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Commit Message

Darrick J. Wong Oct. 29, 2019, 10:29 p.m. UTC
From: Darrick J. Wong <darrick.wong@oracle.com>

Make sure we actually catch bad names in the kernel.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 tests/xfs/749     |  137 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 tests/xfs/749.out |   50 +++++++++++++++++++
 tests/xfs/group   |    1 
 3 files changed, 188 insertions(+)
 create mode 100755 tests/xfs/749
 create mode 100644 tests/xfs/749.out

Comments

Eryu Guan Nov. 3, 2019, 4:15 p.m. UTC | #1
On Tue, Oct 29, 2019 at 03:29:48PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> Make sure we actually catch bad names in the kernel.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---
>  tests/xfs/749     |  137 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  tests/xfs/749.out |   50 +++++++++++++++++++
>  tests/xfs/group   |    1 
>  3 files changed, 188 insertions(+)
>  create mode 100755 tests/xfs/749
>  create mode 100644 tests/xfs/749.out
> 
> diff --git a/tests/xfs/749 b/tests/xfs/749
> new file mode 100755
> index 00000000..a8353cc2
> --- /dev/null
> +++ b/tests/xfs/749
> @@ -0,0 +1,137 @@
> +#! /bin/bash
> +# SPDX-License-Identifier: GPL-2.0-or-newer
> +# Copyright (c) 2019, Oracle and/or its affiliates.  All Rights Reserved.
> +#
> +# FS QA Test No. 749
> +#
> +# See if we catch corrupt directory names or attr names with nulls or slashes
> +# in them.
> +
> +seq=`basename $0`
> +seqres=$RESULT_DIR/$seq
> +echo "QA output created by $seq"
> +
> +here=`pwd`
> +tmp=/tmp/$$
> +status=1    # failure is the default!
> +trap "_cleanup; exit \$status" 0 1 2 3 15
> +
> +_cleanup()
> +{
> +	cd /
> +	$UMOUNT_PROG $mntpt > /dev/null 2>&1
> +	test -n "$loopdev" && _destroy_loop_device $loopdev > /dev/null 2>&1
> +	rm -r -f $imgfile $mntpt $tmp.*
> +}
> +
> +# get standard environment, filters and checks
> +. ./common/rc
> +. ./common/filter
> +. ./common/attr
> +
> +# real QA test starts here
> +_supported_fs xfs
> +_supported_os Linux
> +_require_test
> +_require_attrs
> +_require_xfs_mkfs_crc
> +_disable_dmesg_check
> +
> +rm -f $seqres.full
> +
> +imgfile=$TEST_DIR/img-$seq
> +mntpt=$TEST_DIR/mount-$seq
> +testdir=$mntpt/testdir
> +testfile=$mntpt/testfile
> +nullstr="too_many_beans"
> +slashstr="are_bad_for_you"
> +test_names=("something" "$nullstr" "$slashstr" "another")
> +
> +# Format image file w/o crcs so we can sed the image file
> +$XFS_IO_PROG -f -c 'truncate 40m' $imgfile
> +loopdev=$(_create_loop_device $imgfile)
> +MKFS_OPTIONS="-m crc=0" _mkfs_dev $loopdev >> $seqres.full

I see the following failures after forcing it crc=0 with v5.4-rc4
kernel, just want to make sure if that's all expected?

 attr_get: No data available
 Could not get "a_are_bad/for_you" for TEST_DIR/mount-148/testfile
 ++ ACCESSING BAD METADATA
-ls: reading directory 'TEST_DIR/mount-148/testdir': Structure needs cleaning
+ls: reading directory 'TEST_DIR/mount-148/testdir': Input/output error
 f_something
-attr_list: Structure needs cleaning
+f_too_many
+Attribute "a_something" has a 3 byte value for TEST_DIR/mount-148/testfile
+Attribute "a_are_bad/for_you" has a 3 byte value for TEST_DIR/mount-148/testfile
+Attribute "a_another" has a 3 byte value for TEST_DIR/mount-148/testfile
 TEST_DIR/mount-148/testdir/f_something
 Attribute "a_something" had a 3 byte value for TEST_DIR/mount-148/testfile:
 heh

Thanks,
Eryu

> +
> +# Mount image file
> +mkdir -p $mntpt
> +_mount $loopdev $mntpt
> +
> +echo "creating entries" >> $seqres.full
> +
> +# Create directory entries
> +mkdir -p $testdir
> +for name in "${test_names[@]}"; do
> +	touch "$testdir/f_$name"
> +done
> +
> +# Create attrs
> +touch $testfile
> +for name in "${test_names[@]}"; do
> +	$ATTR_PROG -s "a_$name" -V heh $testfile >> $seqres.full
> +done
> +
> +# Now put in the first part of the garbage names to make sure we can't
> +# access those directly
> +test_names+=("too_many" "are_bad/for_you")
> +
> +access_stuff() {
> +	ls $testdir
> +	$ATTR_PROG -l $testfile
> +
> +	for name in "${test_names[@]}"; do
> +		ls "$testdir/f_$name"
> +		$ATTR_PROG -g "a_$name" $testfile
> +	done
> +}
> +
> +# Does it work?
> +echo "++ ACCESSING GOOD METADATA" | tee -a $seqres.full
> +access_stuff > $tmp.log 2>&1
> +cat $tmp.log >> $seqres.full
> +cat $tmp.log | _filter_test_dir
> +
> +# Corrupt the entries
> +$UMOUNT_PROG $mntpt
> +_destroy_loop_device $loopdev
> +cp $imgfile $imgfile.old
> +sed -b \
> +	-e "s/$nullstr/too_many\x00beans/g" \
> +	-e "s/$slashstr/are_bad\/for_you/g" \
> +	-i $imgfile
> +test "$(md5sum < $imgfile)" != "$(md5sum < $imgfile.old)" ||
> +	_fail "sed failed to change the image file?"
> +rm -f $imgfile.old
> +loopdev=$(_create_loop_device $imgfile)
> +_mount $loopdev $mntpt
> +
> +# Try to access the corrupt metadata
> +echo "++ ACCESSING BAD METADATA" | tee -a $seqres.full
> +access_stuff > $tmp.log 2>&1
> +cat $tmp.log >> $seqres.full
> +cat $tmp.log | _filter_test_dir | sed -e '/Could not list/d'
> +
> +echo "does scrub complain?" >> $seqres.full
> +
> +# Does scrub complain about this?
> +if _supports_xfs_scrub $mntpt $loopdev; then
> +	$XFS_SCRUB_PROG -n $mntpt >> $seqres.full 2>&1
> +	res=$?
> +	test $((res & 1)) -eq 0 && \
> +		echo "scrub failed to report corruption ($res)"
> +fi
> +
> +echo "does repair complain?" >> $seqres.full
> +
> +# Does repair complain about this?
> +$UMOUNT_PROG $mntpt
> +$XFS_REPAIR_PROG -n $loopdev >> $seqres.full 2>&1
> +res=$?
> +test $res -eq 1 || \
> +	echo "repair failed to report corruption ($res)"
> +
> +_destroy_loop_device $loopdev
> +loopdev=
> +
> +# success, all done
> +status=0
> +exit
> diff --git a/tests/xfs/749.out b/tests/xfs/749.out
> new file mode 100644
> index 00000000..ab7b7dc6
> --- /dev/null
> +++ b/tests/xfs/749.out
> @@ -0,0 +1,50 @@
> +QA output created by 749
> +++ ACCESSING GOOD METADATA
> +f_another
> +f_are_bad_for_you
> +f_something
> +f_too_many_beans
> +Attribute "a_something" has a 3 byte value for TEST_DIR/mount-749/testfile
> +Attribute "a_too_many_beans" has a 3 byte value for TEST_DIR/mount-749/testfile
> +Attribute "a_are_bad_for_you" has a 3 byte value for TEST_DIR/mount-749/testfile
> +Attribute "a_another" has a 3 byte value for TEST_DIR/mount-749/testfile
> +TEST_DIR/mount-749/testdir/f_something
> +Attribute "a_something" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> +TEST_DIR/mount-749/testdir/f_too_many_beans
> +Attribute "a_too_many_beans" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> +TEST_DIR/mount-749/testdir/f_are_bad_for_you
> +Attribute "a_are_bad_for_you" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> +TEST_DIR/mount-749/testdir/f_another
> +Attribute "a_another" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> +ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many': No such file or directory
> +attr_get: No data available
> +Could not get "a_too_many" for TEST_DIR/mount-749/testfile
> +ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad/for_you': No such file or directory
> +attr_get: No data available
> +Could not get "a_are_bad/for_you" for TEST_DIR/mount-749/testfile
> +++ ACCESSING BAD METADATA
> +ls: reading directory 'TEST_DIR/mount-749/testdir': Structure needs cleaning
> +f_something
> +attr_list: Structure needs cleaning
> +TEST_DIR/mount-749/testdir/f_something
> +Attribute "a_something" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> +ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many_beans': No such file or directory
> +attr_get: No data available
> +Could not get "a_too_many_beans" for TEST_DIR/mount-749/testfile
> +ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad_for_you': No such file or directory
> +attr_get: No data available
> +Could not get "a_are_bad_for_you" for TEST_DIR/mount-749/testfile
> +TEST_DIR/mount-749/testdir/f_another
> +Attribute "a_another" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> +ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many': No such file or directory
> +attr_get: No data available
> +Could not get "a_too_many" for TEST_DIR/mount-749/testfile
> +ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad/for_you': No such file or directory
> +Attribute "a_are_bad/for_you" had a 3 byte value for TEST_DIR/mount-749/testfile:
> +heh
> diff --git a/tests/xfs/group b/tests/xfs/group
> index f4ebcd8c..9600cb4e 100644
> --- a/tests/xfs/group
> +++ b/tests/xfs/group
> @@ -507,3 +507,4 @@
>  509 auto ioctl
>  510 auto ioctl quick
>  511 auto quick quota
> +749 auto quick fuzzers
Darrick J. Wong Nov. 3, 2019, 6:52 p.m. UTC | #2
On Mon, Nov 04, 2019 at 12:15:59AM +0800, Eryu Guan wrote:
> On Tue, Oct 29, 2019 at 03:29:48PM -0700, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@oracle.com>
> > 
> > Make sure we actually catch bad names in the kernel.
> > 
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > ---
> >  tests/xfs/749     |  137 +++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/xfs/749.out |   50 +++++++++++++++++++
> >  tests/xfs/group   |    1 
> >  3 files changed, 188 insertions(+)
> >  create mode 100755 tests/xfs/749
> >  create mode 100644 tests/xfs/749.out
> > 
> > diff --git a/tests/xfs/749 b/tests/xfs/749
> > new file mode 100755
> > index 00000000..a8353cc2
> > --- /dev/null
> > +++ b/tests/xfs/749
> > @@ -0,0 +1,137 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0-or-newer
> > +# Copyright (c) 2019, Oracle and/or its affiliates.  All Rights Reserved.
> > +#
> > +# FS QA Test No. 749
> > +#
> > +# See if we catch corrupt directory names or attr names with nulls or slashes
> > +# in them.
> > +
> > +seq=`basename $0`
> > +seqres=$RESULT_DIR/$seq
> > +echo "QA output created by $seq"
> > +
> > +here=`pwd`
> > +tmp=/tmp/$$
> > +status=1    # failure is the default!
> > +trap "_cleanup; exit \$status" 0 1 2 3 15
> > +
> > +_cleanup()
> > +{
> > +	cd /
> > +	$UMOUNT_PROG $mntpt > /dev/null 2>&1
> > +	test -n "$loopdev" && _destroy_loop_device $loopdev > /dev/null 2>&1
> > +	rm -r -f $imgfile $mntpt $tmp.*
> > +}
> > +
> > +# get standard environment, filters and checks
> > +. ./common/rc
> > +. ./common/filter
> > +. ./common/attr
> > +
> > +# real QA test starts here
> > +_supported_fs xfs
> > +_supported_os Linux
> > +_require_test
> > +_require_attrs
> > +_require_xfs_mkfs_crc
> > +_disable_dmesg_check
> > +
> > +rm -f $seqres.full
> > +
> > +imgfile=$TEST_DIR/img-$seq
> > +mntpt=$TEST_DIR/mount-$seq
> > +testdir=$mntpt/testdir
> > +testfile=$mntpt/testfile
> > +nullstr="too_many_beans"
> > +slashstr="are_bad_for_you"
> > +test_names=("something" "$nullstr" "$slashstr" "another")
> > +
> > +# Format image file w/o crcs so we can sed the image file
> > +$XFS_IO_PROG -f -c 'truncate 40m' $imgfile
> > +loopdev=$(_create_loop_device $imgfile)
> > +MKFS_OPTIONS="-m crc=0" _mkfs_dev $loopdev >> $seqres.full
> 
> I see the following failures after forcing it crc=0 with v5.4-rc4
> kernel, just want to make sure if that's all expected?

That's the expected output for 5.4; the test should pass on xfs
for-next (i.e. 5.5) since it will contain tighter checks on what's a
valid name.

--D

>  attr_get: No data available
>  Could not get "a_are_bad/for_you" for TEST_DIR/mount-148/testfile
>  ++ ACCESSING BAD METADATA
> -ls: reading directory 'TEST_DIR/mount-148/testdir': Structure needs cleaning
> +ls: reading directory 'TEST_DIR/mount-148/testdir': Input/output error
>  f_something
> -attr_list: Structure needs cleaning
> +f_too_many
> +Attribute "a_something" has a 3 byte value for TEST_DIR/mount-148/testfile
> +Attribute "a_are_bad/for_you" has a 3 byte value for TEST_DIR/mount-148/testfile
> +Attribute "a_another" has a 3 byte value for TEST_DIR/mount-148/testfile
>  TEST_DIR/mount-148/testdir/f_something
>  Attribute "a_something" had a 3 byte value for TEST_DIR/mount-148/testfile:
>  heh
> 
> Thanks,
> Eryu
> 
> > +
> > +# Mount image file
> > +mkdir -p $mntpt
> > +_mount $loopdev $mntpt
> > +
> > +echo "creating entries" >> $seqres.full
> > +
> > +# Create directory entries
> > +mkdir -p $testdir
> > +for name in "${test_names[@]}"; do
> > +	touch "$testdir/f_$name"
> > +done
> > +
> > +# Create attrs
> > +touch $testfile
> > +for name in "${test_names[@]}"; do
> > +	$ATTR_PROG -s "a_$name" -V heh $testfile >> $seqres.full
> > +done
> > +
> > +# Now put in the first part of the garbage names to make sure we can't
> > +# access those directly
> > +test_names+=("too_many" "are_bad/for_you")
> > +
> > +access_stuff() {
> > +	ls $testdir
> > +	$ATTR_PROG -l $testfile
> > +
> > +	for name in "${test_names[@]}"; do
> > +		ls "$testdir/f_$name"
> > +		$ATTR_PROG -g "a_$name" $testfile
> > +	done
> > +}
> > +
> > +# Does it work?
> > +echo "++ ACCESSING GOOD METADATA" | tee -a $seqres.full
> > +access_stuff > $tmp.log 2>&1
> > +cat $tmp.log >> $seqres.full
> > +cat $tmp.log | _filter_test_dir
> > +
> > +# Corrupt the entries
> > +$UMOUNT_PROG $mntpt
> > +_destroy_loop_device $loopdev
> > +cp $imgfile $imgfile.old
> > +sed -b \
> > +	-e "s/$nullstr/too_many\x00beans/g" \
> > +	-e "s/$slashstr/are_bad\/for_you/g" \
> > +	-i $imgfile
> > +test "$(md5sum < $imgfile)" != "$(md5sum < $imgfile.old)" ||
> > +	_fail "sed failed to change the image file?"
> > +rm -f $imgfile.old
> > +loopdev=$(_create_loop_device $imgfile)
> > +_mount $loopdev $mntpt
> > +
> > +# Try to access the corrupt metadata
> > +echo "++ ACCESSING BAD METADATA" | tee -a $seqres.full
> > +access_stuff > $tmp.log 2>&1
> > +cat $tmp.log >> $seqres.full
> > +cat $tmp.log | _filter_test_dir | sed -e '/Could not list/d'
> > +
> > +echo "does scrub complain?" >> $seqres.full
> > +
> > +# Does scrub complain about this?
> > +if _supports_xfs_scrub $mntpt $loopdev; then
> > +	$XFS_SCRUB_PROG -n $mntpt >> $seqres.full 2>&1
> > +	res=$?
> > +	test $((res & 1)) -eq 0 && \
> > +		echo "scrub failed to report corruption ($res)"
> > +fi
> > +
> > +echo "does repair complain?" >> $seqres.full
> > +
> > +# Does repair complain about this?
> > +$UMOUNT_PROG $mntpt
> > +$XFS_REPAIR_PROG -n $loopdev >> $seqres.full 2>&1
> > +res=$?
> > +test $res -eq 1 || \
> > +	echo "repair failed to report corruption ($res)"
> > +
> > +_destroy_loop_device $loopdev
> > +loopdev=
> > +
> > +# success, all done
> > +status=0
> > +exit
> > diff --git a/tests/xfs/749.out b/tests/xfs/749.out
> > new file mode 100644
> > index 00000000..ab7b7dc6
> > --- /dev/null
> > +++ b/tests/xfs/749.out
> > @@ -0,0 +1,50 @@
> > +QA output created by 749
> > +++ ACCESSING GOOD METADATA
> > +f_another
> > +f_are_bad_for_you
> > +f_something
> > +f_too_many_beans
> > +Attribute "a_something" has a 3 byte value for TEST_DIR/mount-749/testfile
> > +Attribute "a_too_many_beans" has a 3 byte value for TEST_DIR/mount-749/testfile
> > +Attribute "a_are_bad_for_you" has a 3 byte value for TEST_DIR/mount-749/testfile
> > +Attribute "a_another" has a 3 byte value for TEST_DIR/mount-749/testfile
> > +TEST_DIR/mount-749/testdir/f_something
> > +Attribute "a_something" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > +TEST_DIR/mount-749/testdir/f_too_many_beans
> > +Attribute "a_too_many_beans" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > +TEST_DIR/mount-749/testdir/f_are_bad_for_you
> > +Attribute "a_are_bad_for_you" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > +TEST_DIR/mount-749/testdir/f_another
> > +Attribute "a_another" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > +ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many': No such file or directory
> > +attr_get: No data available
> > +Could not get "a_too_many" for TEST_DIR/mount-749/testfile
> > +ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad/for_you': No such file or directory
> > +attr_get: No data available
> > +Could not get "a_are_bad/for_you" for TEST_DIR/mount-749/testfile
> > +++ ACCESSING BAD METADATA
> > +ls: reading directory 'TEST_DIR/mount-749/testdir': Structure needs cleaning
> > +f_something
> > +attr_list: Structure needs cleaning
> > +TEST_DIR/mount-749/testdir/f_something
> > +Attribute "a_something" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > +ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many_beans': No such file or directory
> > +attr_get: No data available
> > +Could not get "a_too_many_beans" for TEST_DIR/mount-749/testfile
> > +ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad_for_you': No such file or directory
> > +attr_get: No data available
> > +Could not get "a_are_bad_for_you" for TEST_DIR/mount-749/testfile
> > +TEST_DIR/mount-749/testdir/f_another
> > +Attribute "a_another" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > +ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many': No such file or directory
> > +attr_get: No data available
> > +Could not get "a_too_many" for TEST_DIR/mount-749/testfile
> > +ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad/for_you': No such file or directory
> > +Attribute "a_are_bad/for_you" had a 3 byte value for TEST_DIR/mount-749/testfile:
> > +heh
> > diff --git a/tests/xfs/group b/tests/xfs/group
> > index f4ebcd8c..9600cb4e 100644
> > --- a/tests/xfs/group
> > +++ b/tests/xfs/group
> > @@ -507,3 +507,4 @@
> >  509 auto ioctl
> >  510 auto ioctl quick
> >  511 auto quick quota
> > +749 auto quick fuzzers

Patch
diff mbox series

diff --git a/tests/xfs/749 b/tests/xfs/749
new file mode 100755
index 00000000..a8353cc2
--- /dev/null
+++ b/tests/xfs/749
@@ -0,0 +1,137 @@ 
+#! /bin/bash
+# SPDX-License-Identifier: GPL-2.0-or-newer
+# Copyright (c) 2019, Oracle and/or its affiliates.  All Rights Reserved.
+#
+# FS QA Test No. 749
+#
+# See if we catch corrupt directory names or attr names with nulls or slashes
+# in them.
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1    # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+_cleanup()
+{
+	cd /
+	$UMOUNT_PROG $mntpt > /dev/null 2>&1
+	test -n "$loopdev" && _destroy_loop_device $loopdev > /dev/null 2>&1
+	rm -r -f $imgfile $mntpt $tmp.*
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/attr
+
+# real QA test starts here
+_supported_fs xfs
+_supported_os Linux
+_require_test
+_require_attrs
+_require_xfs_mkfs_crc
+_disable_dmesg_check
+
+rm -f $seqres.full
+
+imgfile=$TEST_DIR/img-$seq
+mntpt=$TEST_DIR/mount-$seq
+testdir=$mntpt/testdir
+testfile=$mntpt/testfile
+nullstr="too_many_beans"
+slashstr="are_bad_for_you"
+test_names=("something" "$nullstr" "$slashstr" "another")
+
+# Format image file w/o crcs so we can sed the image file
+$XFS_IO_PROG -f -c 'truncate 40m' $imgfile
+loopdev=$(_create_loop_device $imgfile)
+MKFS_OPTIONS="-m crc=0" _mkfs_dev $loopdev >> $seqres.full
+
+# Mount image file
+mkdir -p $mntpt
+_mount $loopdev $mntpt
+
+echo "creating entries" >> $seqres.full
+
+# Create directory entries
+mkdir -p $testdir
+for name in "${test_names[@]}"; do
+	touch "$testdir/f_$name"
+done
+
+# Create attrs
+touch $testfile
+for name in "${test_names[@]}"; do
+	$ATTR_PROG -s "a_$name" -V heh $testfile >> $seqres.full
+done
+
+# Now put in the first part of the garbage names to make sure we can't
+# access those directly
+test_names+=("too_many" "are_bad/for_you")
+
+access_stuff() {
+	ls $testdir
+	$ATTR_PROG -l $testfile
+
+	for name in "${test_names[@]}"; do
+		ls "$testdir/f_$name"
+		$ATTR_PROG -g "a_$name" $testfile
+	done
+}
+
+# Does it work?
+echo "++ ACCESSING GOOD METADATA" | tee -a $seqres.full
+access_stuff > $tmp.log 2>&1
+cat $tmp.log >> $seqres.full
+cat $tmp.log | _filter_test_dir
+
+# Corrupt the entries
+$UMOUNT_PROG $mntpt
+_destroy_loop_device $loopdev
+cp $imgfile $imgfile.old
+sed -b \
+	-e "s/$nullstr/too_many\x00beans/g" \
+	-e "s/$slashstr/are_bad\/for_you/g" \
+	-i $imgfile
+test "$(md5sum < $imgfile)" != "$(md5sum < $imgfile.old)" ||
+	_fail "sed failed to change the image file?"
+rm -f $imgfile.old
+loopdev=$(_create_loop_device $imgfile)
+_mount $loopdev $mntpt
+
+# Try to access the corrupt metadata
+echo "++ ACCESSING BAD METADATA" | tee -a $seqres.full
+access_stuff > $tmp.log 2>&1
+cat $tmp.log >> $seqres.full
+cat $tmp.log | _filter_test_dir | sed -e '/Could not list/d'
+
+echo "does scrub complain?" >> $seqres.full
+
+# Does scrub complain about this?
+if _supports_xfs_scrub $mntpt $loopdev; then
+	$XFS_SCRUB_PROG -n $mntpt >> $seqres.full 2>&1
+	res=$?
+	test $((res & 1)) -eq 0 && \
+		echo "scrub failed to report corruption ($res)"
+fi
+
+echo "does repair complain?" >> $seqres.full
+
+# Does repair complain about this?
+$UMOUNT_PROG $mntpt
+$XFS_REPAIR_PROG -n $loopdev >> $seqres.full 2>&1
+res=$?
+test $res -eq 1 || \
+	echo "repair failed to report corruption ($res)"
+
+_destroy_loop_device $loopdev
+loopdev=
+
+# success, all done
+status=0
+exit
diff --git a/tests/xfs/749.out b/tests/xfs/749.out
new file mode 100644
index 00000000..ab7b7dc6
--- /dev/null
+++ b/tests/xfs/749.out
@@ -0,0 +1,50 @@ 
+QA output created by 749
+++ ACCESSING GOOD METADATA
+f_another
+f_are_bad_for_you
+f_something
+f_too_many_beans
+Attribute "a_something" has a 3 byte value for TEST_DIR/mount-749/testfile
+Attribute "a_too_many_beans" has a 3 byte value for TEST_DIR/mount-749/testfile
+Attribute "a_are_bad_for_you" has a 3 byte value for TEST_DIR/mount-749/testfile
+Attribute "a_another" has a 3 byte value for TEST_DIR/mount-749/testfile
+TEST_DIR/mount-749/testdir/f_something
+Attribute "a_something" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
+TEST_DIR/mount-749/testdir/f_too_many_beans
+Attribute "a_too_many_beans" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
+TEST_DIR/mount-749/testdir/f_are_bad_for_you
+Attribute "a_are_bad_for_you" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
+TEST_DIR/mount-749/testdir/f_another
+Attribute "a_another" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
+ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many': No such file or directory
+attr_get: No data available
+Could not get "a_too_many" for TEST_DIR/mount-749/testfile
+ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad/for_you': No such file or directory
+attr_get: No data available
+Could not get "a_are_bad/for_you" for TEST_DIR/mount-749/testfile
+++ ACCESSING BAD METADATA
+ls: reading directory 'TEST_DIR/mount-749/testdir': Structure needs cleaning
+f_something
+attr_list: Structure needs cleaning
+TEST_DIR/mount-749/testdir/f_something
+Attribute "a_something" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
+ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many_beans': No such file or directory
+attr_get: No data available
+Could not get "a_too_many_beans" for TEST_DIR/mount-749/testfile
+ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad_for_you': No such file or directory
+attr_get: No data available
+Could not get "a_are_bad_for_you" for TEST_DIR/mount-749/testfile
+TEST_DIR/mount-749/testdir/f_another
+Attribute "a_another" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
+ls: cannot access 'TEST_DIR/mount-749/testdir/f_too_many': No such file or directory
+attr_get: No data available
+Could not get "a_too_many" for TEST_DIR/mount-749/testfile
+ls: cannot access 'TEST_DIR/mount-749/testdir/f_are_bad/for_you': No such file or directory
+Attribute "a_are_bad/for_you" had a 3 byte value for TEST_DIR/mount-749/testfile:
+heh
diff --git a/tests/xfs/group b/tests/xfs/group
index f4ebcd8c..9600cb4e 100644
--- a/tests/xfs/group
+++ b/tests/xfs/group
@@ -507,3 +507,4 @@ 
 509 auto ioctl
 510 auto ioctl quick
 511 auto quick quota
+749 auto quick fuzzers