linux-kernel - Re: [PATCH] parisc: mm: Fix a memory leak related to pmd not attached to the pgd

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <alpine.LRH.2.11.1507202228030.21509@math.ut.ee>
Date:	Mon, 20 Jul 2015 22:28:56 +0300 (EEST)
From:	Meelis Roos <mroos@...ux.ee>
To:	Helge Deller <deller@....de>
cc:	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	jejb@...isc-linux.org, mpatocka@...hat.com,
	kirill.shutemov@...ux.intel.com, linux-parisc@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	John David Anglin <dave.anglin@...l.net>
Subject: Re: [PATCH] parisc: mm: Fix a memory leak related to pmd not attached
 to the pgd

> Hi Christophe,
> 
> On 13.07.2015 11:32, Christophe JAILLET wrote:
> > Commit 0e0da48dee8d ("parisc: mm: don't count preallocated pmds")
> > introduced a memory leak.
> >
> > After this commit, the 'return' statement in pmd_free is executed in all
> > cases. Even for pmd that are not attached to the pgd.
> > So 'free_pages' can never be called anymore, leading to a memory leak.
> 
> That's really great!!! Thanks for spotting this!
> 
> I assume this fixes the leak which killed our debian buildds with OOM
> after an uptime of 1-4 days and which only happened since kernel 4.0.
> Meelis Roos reported the issue already in this thread:
> http://marc.info/?l=linux-parisc&m=142999113232154&w=2

Yes, the patch that is merged in 4.2-rc3 fixed my RP3410 with 1G RAM.

-- 
Meelis Roos (mroos@...ux.ee)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/