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Date: Fri, 20 Apr 2018 16:02:23 -0700
From: Kees Cook <keescook@...omium.org>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>,
Segher Boessenkool <segher@...nel.crashing.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>,
Andrew Morton <akpm@...uxfoundation.org>,
Boris Brezillon <boris.brezillon@...e-electrons.com>, Richard Weinberger <richard@....at>,
David Woodhouse <dwmw2@...radead.org>, Alasdair Kergon <agk@...hat.com>, Mike Snitzer <snitzer@...hat.com>,
Anton Vorontsov <anton@...msg.org>, Colin Cross <ccross@...roid.com>, Tony Luck <tony.luck@...el.com>
Subject: Re: [patch V2 0/8] rslib: Cleanup and VLA removal
On Thu, Apr 19, 2018 at 3:04 AM, Thomas Gleixner <tglx@...utronix.de> wrote:
> Kees tried to get rid of the Variable Length Arrays in the Reed-Solomon
> library by replacing them with fixed length arrays on stack. Though they
> are rather large and Andrew did not fall in love with that solution.
>
> This series addresses that in a different way by splitting the rs control
> structure up, so that each invocation of rs_init() returns a new instance
> in which the decoder buffers are allocated. The polynom tables which build
> the base for the RS codecs are still shareable between the instances to
> avoid large allocations and initializations of the same data over and over.
>
> The usage sites have been audited and fixed up where necessary to
> accomodate the decoder change which forbids parallel decoder invocation for
> a particular rs control instance to prevent buffer corruption.
>
> While at it the patch set tidies up the code and converts the related files
> over to use SPDX license identifiers.
>
> Changes since V1:
>
> Simplify error path in the diskonchip code and use the proper
> function to free the decoder.
>
> As this spawns multiple subsystems it should either go through Andrews tree
> or Kees can route it with his other hardening stuff.
I can start collecting ignored VLA patches. I haven't done that yet as
most maintainers have been taking them. There are only a handful
unapplied. Should I start the tree with rslib? :)
Either way:
Reviewed-by: Kees Cook <keescook@...omium.org>
-Kees
--
Kees Cook
Pixel Security
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