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Bug 602427

Summary: ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate
Product: Red Hat Enterprise Linux 6 Reporter: Eric Sandeen <esandeen>
Component: kernelAssignee: Eric Sandeen <esandeen>
Status: CLOSED CURRENTRELEASE QA Contact: Petr Beňas <pbenas>
Severity: medium Docs Contact:
Priority: low    
Version: 6.0CC: pbenas, pstehlik
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-11-11 16:11:24 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Eric Sandeen 2010-06-09 20:10:07 UTC 
Should pull back:

From: Nikanth Karthikesan <knikanth>
Date: Sun, 16 May 2010 18:00:00 +0000 (-0400)
Subject: ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate
X-Git-Tag: v2.6.35-rc1~39^2~18
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=6d19c42b7cf81c39632b6d4dbc514e8449bcd346

ext4: Prevent creation of files larger than RLIMIT_FSIZE using fallocate

Currently using posix_fallocate one can bypass an RLIMIT_FSIZE limit
and create a file larger than the limit. Add a check for that.

Signed-off-by: Nikanth Karthikesan <knikanth>
Signed-off-by: Amit Arora <aarora.com>
Signed-off-by: "Theodore Ts'o" <tytso>
---
Comment 1 RHEL Program Management 2010-06-09 20:13:02 UTC 
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.
Comment 3 Aristeu Rozanski 2010-07-01 16:22:26 UTC 
Patch(es) available on kernel-2.6.32-42.el6
Comment 6 Petr Beňas 2010-07-08 14:08:15 UTC 
reproduced in 2.6.32-41.el6.x86_64, verified in 2.6.32-42.el6.x86_64
[root@dell-pe2950-01 xfstests]# uname -r
2.6.32-41.el6.x86_64
[root@dell-pe2950-01 xfstests]# ./check 228
FSTYP         -- ext4
PLATFORM      -- Linux/x86_64 dell-pe2950-01 2.6.32-41.el6.x86_64

228      - output mismatch (see 228.out.bad)
--- 228.out     2010-07-08 09:25:10.934808987 -0400
+++ 228.out.bad 2010-07-08 09:48:33.057058887 -0400
@@ -1,6 +1,6 @@
 QA output created by 228
 File size limit is now set to 100 MB.
 Let us try to preallocate 101 MB. This should fail.
-File size limit exceeded
+File size limit exceeded (core dumped)
 Let us now try to preallocate 50 MB. This should succeed.
 Test over.
Ran: 228
Failures: 228
Failed 1 of 1 tests

[root@dell-pe2950-01 xfstests]# uname -r
2.6.32-42.el6.x86_64
[root@dell-pe2950-01 xfstests]# ./check 228
FSTYP         -- ext4
PLATFORM      -- Linux/x86_64 dell-pe2950-01 2.6.32-42.el6.x86_64

228      - output mismatch (see 228.out.bad)
--- 228.out     2010-07-08 09:25:10.934808987 -0400
+++ 228.out.bad 2010-07-08 09:57:02.481348900 -0400
@@ -1,6 +1,6 @@
 QA output created by 228
 File size limit is now set to 100 MB.
 Let us try to preallocate 101 MB. This should fail.
-File size limit exceeded
+File size limit exceeded (core dumped)
 Let us now try to preallocate 50 MB. This should succeed.
 Test over.
Ran: 228
Failures: 228
Failed 1 of 1 tests
Comment 7 Eric Sandeen 2010-07-12 18:39:26 UTC 
FWIW I've sent a patch upstream to get rid of the (core dumped) discrepancy in this output:

"[PATCH] xfstests 228: suppress core dump message"

http://oss.sgi.com/pipermail/xfs/2010-June/045796.html
Comment 8 releng-rhel@redhat.com 2010-11-11 16:11:24 UTC 
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.