linux-kernel - Re: Potentially unbounded allocations in seq

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Message-ID: <1386859952.6066.80.camel@tursulin-linux.isw.intel.com>
Date:	Thu, 12 Dec 2013 14:52:32 +0000
From:	Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Potentially unbounded allocations in seq_read?

On Thu, 2013-12-12 at 14:21 +0000, Al Viro wrote:
> On Thu, Dec 12, 2013 at 01:59:31PM +0000, Tvrtko Ursulin wrote:
> 
> > > a) *what* errors other than -ENAMETOOLONG?
> > 
> > Is this your way of saying there can't be any other errors from d_path?
> 
> Check yourself...  It is the only error that makes sense there and yes,
> it is the only one being returned.

Cool then, thats why I e-mailed you in the first place, because you know
this area very well. 

> > > b) d_path() not fitting into 2Mb is definitely a bug.  If you really have
> > > managed to get a dentry tree 1 million levels deep, you have much worse
> > > problems.
> > > c) which kernel version it is?
> > 
> > 3.10. I can't imagine this is an actual dentry tree somewhere, probably
> > just a bug of some sort. I'll probably hunt it down completely some time
> > next week, time permitting.
> 
> Sounds like missing backport of 118b23 ("cope with potentially long ->d_dname()
> output for shmem/hugetlb").  It *is* in -stable (linux-3.10.y has it since
> 3.10.17 as commit ad4c3c), but if your tree doesn't have it, that's the one
> to try first...

Yes that fixed it, thanks!

Regards,

Tvrtko


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