linux-kernel - Re: Crypto Update for 4.1

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Date:	Thu, 23 Apr 2015 22:10:26 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Bobby Powers <bobbypowers@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Stephan Mueller <smueller@...onox.de>,
	"David S. Miller" <davem@...emloft.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Crypto Mailing List <linux-crypto@...r.kernel.org>
Subject: Re: Crypto Update for 4.1

On 23 April 2015 at 21:27, Bobby Powers <bobbypowers@...il.com> wrote:
> Hello,
>
> Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>> Ok, this patch seems to fix it for me, so I undid my revert that I
>> hadn't pushed out yet, and pushed out this instead.
>
> Commit e68410ebf62676dfb93aafff7c55b76644f37072 in Linus's tree from
> this crpyto update (crypto: x86/sha512_ssse3 - move SHA-384/512 SSSE3
> implementation to base layer) causes a GPF on boot in
> sha512_ssse3_finup for me on a Broadwell i7-5600U, rendering the
> kernel unbootable.
>
> Reverting that commit enables me to boot.  I don't know enough about
> the code to comment.  Config is attached, and I can provide a photo of
> the reported Call Trace if thats helpful.  It is quite reproducible
> for me.
>

Hello Bobby,

Would you be able to check whether the following patch fixes the crash?

diff --git a/arch/x86/crypto/sha512-avx2-asm.S
b/arch/x86/crypto/sha512-avx2-asm.S
index a4771dcd1fcf..1f20b35d8573 100644
--- a/arch/x86/crypto/sha512-avx2-asm.S
+++ b/arch/x86/crypto/sha512-avx2-asm.S
@@ -79,7 +79,7 @@ NUM_BLKS    = %rdx
 c           = %rcx
 d           = %r8
 e           = %rdx
-y3          = %rdi
+y3          = %rsi

 TBL   = %rbp

If not, please share the call trace and the content of /proc/cpuinfo

Regards,
Ard.
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