linux-kernel - Re: page allocator regression on nommu

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

Message-ID: <6126.1251812147@redhat.com>
Date:	Tue, 01 Sep 2009 14:35:47 +0100
From:	David Howells <dhowells@...hat.com>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	dhowells@...hat.com, Paul Mundt <lethal@...ux-sh.org>,
	Mel Gorman <mel@....ul.ie>,
	Christoph Lameter <cl@...ux-foundation.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: page allocator regression on nommu

Pekka Enberg <penberg@...helsinki.fi> wrote:

> This looks to be a bug in nommu do_mmap_pgoff() error handling. I
> guess we shouldn't call __put_nommu_region() if add_nommu_region()
> hasn't been called?

We should to make sure the region gets cleaned up properly.  However, it will
go wrong if do_mmap_shared_file() or do_mmap_private() fail.  We should
perhaps call add_nommu_region() before doing the "set up the mapping" chunk -
we hold the region semaphore, so it shouldn't hurt anyone if we then have to
remove it again.

David
--
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/