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Date: Mon, 3 Feb 2020 09:38:11 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Kees Cook <keescook@...omium.org>
Cc: Christian Borntraeger <borntraeger@...ibm.com>,
Christoph Hellwig <hch@...radead.org>,
Christopher Lameter <cl@...ux.com>, Jiri Slaby <jslaby@...e.cz>,
Julian Wiedmann <jwi@...ux.ibm.com>,
Ursula Braun <ubraun@...ux.ibm.com>,
Alexander Viro <viro@...iv.linux.org.uk>,
linux-kernel@...r.kernel.org, David Windsor <dave@...lcore.net>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-xfs@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
"David S. Miller" <davem@...emloft.net>,
Laura Abbott <labbott@...hat.com>,
Mark Rutland <mark.rutland@....com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Paolo Bonzini <pbonzini@...hat.com>,
Christoffer Dall <christoffer.dall@...aro.org>,
Dave Kleikamp <dave.kleikamp@...cle.com>, Jan Kara <jack@...e.cz>,
Luis de Bethencourt <luisbg@...nel.org>,
Marc Zyngier <marc.zyngier@....com>, Rik van Riel <riel@...hat.com>,
Matthew Garrett <mjg59@...gle.com>, linux-fsdevel@...r.kernel.org,
linux-arch@...r.kernel.org, netdev@...r.kernel.org,
kernel-hardening@...ts.openwall.com,
Vlastimil Babka <vbabka@...e.cz>, Michal Kubecek <mkubecek@...e.cz>
Subject: Re: [PATCH 09/38] usercopy: Mark kmalloc caches
as usercopy caches
On Thu, Jan 30, 2020 at 11:23:38AM -0800, Kees Cook wrote:
> Hm, looks like it's allocated from the low 16MB. Seems like poor naming!
> :) There seems to be a LOT of stuff using GFP_DMA, and it seems unlikely
> those are all expecting low addresses?
Most of that is either completely or partially bogus. Besides the
weird S/390 stuff pretty much everything should be using the dma
allocators. A couple really messed up drivers even pass GFP_DMA*
to the dma allocator, but my patches to fix that up seem to be stuck.
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