linux-kernel - Re: [PATCH 1/2] MIPS: memset.S: EVA & fault support for small

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] [day] [month] [year] [list]

Date:   Mon, 14 May 2018 23:56:01 +0100
From:   "Maciej W. Rozycki" <macro@...s.com>
To:     James Hogan <jhogan@...nel.org>
CC:     Matt Redfearn <matt.redfearn@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        <linux-mips@...ux-mips.org>, <stable@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] MIPS: memset.S: EVA & fault support for
 small_memset

On Mon, 16 Apr 2018, James Hogan wrote:

> > @@ -260,6 +260,11 @@
> >  	jr		ra
> >  	andi		v1, a2, STORMASK
> 
> This patch looks good, well spotted!
> 
> But whats that v1 write about? Any ideas? Seems to go back to the git
> epoch, and $3 isn't in the clobber lists when __bzero* is called.

 You need to dive deeper, that is beyond the secret commit 66f0a432564b 
("Add resource managment."), to find what's happened before the epoch. ;)

 Anyway, there isn't anything special here, the thing has been here since 
the inception of memset.S with commit 2e0f55e79c49 (no shortlog available 
for that one).  And it is clearly a bug, possibly just a leftover from a 
WIP implementation or whatever.

 And I can see Matt has already fixed that, thanks!

  Maciej