linux-kernel - Re: [PATCH 02/22] Do not sanity check order in the fast path

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]

Date:	Thu, 23 Apr 2009 10:44:53 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Mel Gorman <mel@....ul.ie>, Dave Hansen <dave@...ux.vnet.ibm.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 02/22] Do not sanity check order in the fast path

On Wed, 2009-04-22 at 13:11 -0700, David Rientjes wrote:
> On Wed, 22 Apr 2009, Mel Gorman wrote:
> 
> > If there are users with good reasons, then we could convert this to WARN_ON
> > to fix up the callers. I suspect that the allocator can already cope with
> > recieving a stupid order silently but slowly. It should go all the way to the
> > bottom and just never find anything useful and return NULL.  zone_watermark_ok
> > is the most dangerous looking part but even it should never get to MAX_ORDER
> > because it should always find there are not enough free pages and return
> > before it overruns.

> slub: enforce MAX_ORDER
> 
> slub_max_order may not be equal to or greater than MAX_ORDER.
> 
> Additionally, if a single object cannot be placed in a slab of
> slub_max_order, it still must allocate slabs below MAX_ORDER.
> 
> Cc: Christoph Lameter <cl@...ux-foundation.org>
> Signed-off-by: David Rientjes <rientjes@...gle.com>

Applied, thanks!

--
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/