linux-kernel - Re: [PATCH] drm/ttm: dma: Don't crash on memory in the vmalloc range

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:	Fri, 15 May 2015 12:48:57 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Courbot <acourbot@...dia.com>
Cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Hellstrom <thellstrom@...are.com>,
	Arnd Bergmann <arnd@...db.de>, David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	gnurou@...il.com
Subject: Re: [PATCH] drm/ttm: dma: Don't crash on memory in the vmalloc range

On Fri, May 15, 2015 at 04:09:54PM +0900, Alexandre Courbot wrote:
> dma_alloc_coherent() can return memory in the vmalloc range.
> virt_to_page() cannot handle such addresses and crashes. This
> patch detects such cases and obtains the struct page * using
> vmalloc_to_page() instead.
> 
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
> This patch is a follow-up of the following discussion:
> 
> https://www.marc.info/?l=dri-devel&m=141579595431254&w=3
> 
> It works for me on both 32-bit and 64-bit Tegra, so I am not convinced
> that Thierry's initial change from virt_to_page() to phys_to_page() is
> still required - Thierry, can you confirm whether your patch is still
> relevant after this one?

If this works for you on both 32-bit and 64-bit Tegra I don't think the
earlier patch is still relevant and this looks indeed like a much more
appropriate solution.

Thierry

Content of type "application/pgp-signature" skipped