linux-kernel - Re: [PATCH v2 00/48] ARM: PXA multiplatform support

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]

Date:   Mon, 2 May 2022 19:55:34 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Robert Jarzmik <robert.jarzmik@...e.fr>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Philipp Zabel <philipp.zabel@...il.com>,
        Lubomir Rintel <lkundrak@...sk>,
        Paul Parsons <lost.distance@...oo.com>,
        Sergey Lapin <slapin@...fans.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Helge Deller <deller@....de>, Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        IDE-ML <linux-ide@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        patches@...nsource.cirrus.com, linux-leds@...r.kernel.org,
        linux-mmc <linux-mmc@...r.kernel.org>,
        linux-mtd <linux-mtd@...ts.infradead.org>,
        linux-rtc@...r.kernel.org, USB list <linux-usb@...r.kernel.org>,
        Linux Fbdev development list <linux-fbdev@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        ALSA Development Mailing List <alsa-devel@...a-project.org>
Subject: Re: [PATCH v2 00/48] ARM: PXA multiplatform support

On 5/2/22 14:03, Arnd Bergmann wrote:
> On Mon, May 2, 2022 at 10:35 PM Guenter Roeck <linux@...ck-us.net> wrote:
>> On 5/2/22 12:21, Arnd Bergmann wrote:
>>>
>>
>> To boot from initrd:
>>
>> qemu-system-arm -M z2 -kernel \
>>        arch/arm/boot/zImage -no-reboot -initrd \
>>        rootfs-armv5.cpio --append \
>>        "panic=-1 slub_debug=FZPUA rdinit=/sbin/init console=ttyS0" -nographic \
>>        -monitor null -serial stdio
>>
>> where rootfs-armv5.cpio is from my repository at github.com.
>>
>> https://github.com/groeck/linux-build-test/blob/master/rootfs/arm/rootfs-armv5.cpio.gz
>>
> 
> Ok, that works here with any configuration, I don't see a regression.
> Could this be a problem with the size increase? The machine only has
> 32MB of RAM, so it's possible that the multiplatform-enabled kernel
> with DT support etc pushes it over the edge, especially with an initramfs.
> 

qemu puts initrd in the middle of available memory. With the image size
being ~1MB larger than with v5.18-rc, this is too much, and the kernel
overwrites part of initrd. This causes it to be corrupted.

It looks like that would have happened eventually, your patch series just
made it happen now. The kernel is just getting too large to run on such small
systems. I worked around the problem in my version of qemu by loading initrd
at the end of the (small) RAM. With that, I no longer see the boot failure.

Guenter