linux-kernel - Re: [PATCH 2/2] PCI: imx6: limit DBI register length

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: <1542675983.30311.575.camel@impinj.com>
Date:   Tue, 20 Nov 2018 01:06:24 +0000
From:   Trent Piepho <tpiepho@...inj.com>
To:     "stefan@...er.ch" <stefan@...er.ch>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/2] PCI: imx6: limit DBI register length

On Mon, 2018-11-19 at 10:41 +0100, Stefan Agner wrote:
> Define the length of the DBI registers. This makes sure that
> the kernel does not access registers beyond that point, avoiding
> the following abort on a i.MX 6Quad:
>   # cat
> /sys/devices/soc0/soc/1ffc000.pcie/pci0000\:00/0000\:00\:00.0/config
>   [  100.021433] Unhandled fault: imprecise external abort (0x1406)
> at 0xb6ea7000
>   ...
>   [  100.056423] PC is at dw_pcie_read+0x50/0x84
>   [  100.060790] LR is at dw_pcie_rd_own_conf+0x44/0x48
>   ...
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>

After updating this for v4.20-rc2, tested on IMX 7d, config space
access works as before.

Tested-by: Trent Piepho <tpiepho@...inj.com>