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Description of problem:
[6.0] write system call returns with 0 when it should return with EFBIG.
Version-Release number of selected component (if applicable):
V6.0
How reproducible:
By running the following reproducer(Step to Reproduce), we can confirm that the
write system call returns with 0 when it should return the error EFBIG.
This fix is already included in 2.6.36-rc1.
(http://marc.info/?l=git-commits-head&m=128121851624648&w=2)
Please apply it.
Version-Release number of selected component:
Red Hat Enterprise Linux Version Number: RHEL6
Release Number: 6.0rc
Architecture: x86_64
Kernel Version: 2.6.32-71.el6
Related Package Version: kernel
Related Middleware / Application: None
Step to Reproduce:
-------------------------------------------------------------------------------
#!/bin/sh
/bin/dd if=/dev/zero of=./img bs=1k count=1 seek=1024k > /dev/null 2>&1
/sbin/mkfs.ext3 -Fq ./img
/bin/mount -o loop -t ext4 ./img /mnt
/bin/touch /mnt/file
/usr/bin/strace /bin/dd if=/dev/zero of=/mnt/file conv=notrunc bs=1k count=1 \
seek=$((2194719883264/1024)) 2>&1 | /bin/egrep "write.* 1024\) = "
/bin/umount /mnt
exit
-------------------------------------------------------------------------------
Run this script.
Actual Results:
write system call returns with 0 in this case.
Expected Results:
write system call returns with EFBIG in this case.
Just as a general note, using the ext4 driver for ext3 filesystems in RHEL6 is not recommended. We can fix this, but it's not the preferred mode of operation.
Upstream commit:
commit d889dc8382c4d71b6d538b7b13777bc1ec51df10
Author: Toshiyuki Okajima <toshi.okajima.com>
Date: Tue Jul 27 11:56:07 2010 -0400
ext4: fix EFBIG edge case when writing to large non-extent file
By running the following reproducer, we can confirm that the write
system call returns with 0 when it should return the error EFBIG.
#!/bin/sh
/bin/dd if=/dev/zero of=./img bs=1k count=1 seek=1024k > /dev/null 2>&1
/sbin/mkfs.ext3 -Fq ./img
/bin/mount -o loop -t ext4 ./img /mnt
/bin/touch /mnt/file
strace /bin/dd if=/dev/zero of=/mnt/file conv=notrunc bs=1k count=1 seek=$((2194719883264/1024)) 2>&1 | /bin/egrep "w
/bin/umount /mnt
exit
Signed-off-by: Toshiyuki Okajima <toshi.okajima.com>
Signed-off-by: "Theodore Ts'o" <tytso>
Cc: Eric Sandeen <sandeen>
Comment 5RHEL Program Management
2010-11-23 18:49:27 UTC
This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products. This request is not yet committed for inclusion in an Update release.
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.
http://rhn.redhat.com/errata/RHSA-2011-0542.html