From: Eric Sandeen <sandeen@sandeen.net>
To: Rich Johnston <rjohnston@sgi.com>, xfs@oss.sgi.com
Subject: Re: [PATCH 0/2] xfsdump: fix problems in cb_add_inogrp
Date: Fri, 21 Aug 2015 11:39:48 -0500 [thread overview]
Message-ID: <55D75454.1060003@sandeen.net> (raw)
In-Reply-To: <55D7540D.7060700@sgi.com>
On 8/21/15 11:38 AM, Rich Johnston wrote:
> On 08/21/2015 10:47 AM, Eric Sandeen wrote:
>> On 8/21/15 9:01 AM, rjohnston@sgi.com wrote:
>>> The memset in cb_add_inogrp will segfault when the index oldsize
>>> overflows. In cb_add_inogrp(), the temp variables used in
>>> calculating the new i2gmap segment offset should be int64 instead
>>> of intgen_t (int32).
>>>
>>> A second bug also occurs because we already compensate for the
>>> length of each item in oldsize so are 32bit wrap becomes a 40bit
>>> wrap.
>>
>> Hi -
>>
>> Are there any testcases for these? xfsdump is alien code, I swear;
>> I'm not quite sure offhand how to tickle any of these bugs.
>>
>> Thanks,
>> -Eric
>>
> No I thought simple examination shows the bug.
Nothing is simple in xfsdump, IMHO. At least to the uninitiated. :)
> It was a customer bug.
>
> The number of inodes that we needed before wrapping was a couple hundred inodes.
I did eventually manage to hit the segfault, thanks.
-Eric
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next prev parent reply other threads:[~2015-08-21 16:39 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-21 14:01 [PATCH 0/2] xfsdump: fix problems in cb_add_inogrp rjohnston
2015-08-21 14:01 ` [PATCH 1/2] xfsdump: use 64bit local variables in inode.c rjohnston
2015-08-21 17:03 ` Eric Sandeen
2015-08-21 18:22 ` Eric Sandeen
2015-08-21 14:01 ` [PATCH 2/2] xfsdump: don't do pointer math twice rjohnston
2015-08-21 17:24 ` Eric Sandeen
2015-08-21 15:47 ` [PATCH 0/2] xfsdump: fix problems in cb_add_inogrp Eric Sandeen
2015-08-21 16:38 ` Rich Johnston
2015-08-21 16:39 ` Eric Sandeen [this message]
2015-08-21 16:49 ` Rich Johnston
2015-08-21 20:08 ` Rich Johnston
2015-08-21 20:11 ` Eric Sandeen
2015-08-26 14:33 ` Rich Johnston
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