linux-kernel - Re: Domain faults when CONFIG_CPU_SW_DOMAIN

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]

Message-ID: <20151203115143.GM8644@n2100.arm.linux.org.uk>
Date:	Thu, 3 Dec 2015 11:51:43 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Rosin <peda@...ntia.se>
Cc:	"'linux-arm-kernel@...ts.infradead.org'" 
	<linux-arm-kernel@...ts.infradead.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: Re: Domain faults when CONFIG_CPU_SW_DOMAIN_PAN is enabled

On Thu, Dec 03, 2015 at 11:38:20AM +0000, Peter Rosin wrote:
> Russell King wrote:
> > On Thu, Dec 03, 2015 at 08:33:13AM +0000, Peter Rosin wrote:
> > > I wrote:
> > > > If I enable CONFIG_CPU_SW_DOMAIN_PAN, I sometimes (but not always) get the
> > > > following (or very similar) on boot.
> > > 
> > > I should have said "if I don't disable", as the option is "default y".
> > > 
> > > Also, if it survives on boot, below is an example of later trouble (after
> > > 30+ minutes on this occasion).
> > 
> > Please apply this patch so we (might) get a slightly better oops dump,
> > and then try to reproduce.
> 
> Sure thing, but it's still "DAC: 00000051"...

Thanks, that confirms that something in the uaccess-with-memcpy code
is clearing the DACR back to 0x51.

This has come up several times before, and I really can't spot the
problem in this code, so I've always said to disable the
uaccess-with-memcpy code.  Personally, I'd like to see the back
of that code...

-- 
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/