linux-kernel - Re: [PATCH 1/7] ARM: disallow combining XIP and LTO

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: <CAK8P3a3S=PRwOnvtzFENMC+iTLRMiibpMmSS=GynLMSfN1OpZA@mail.gmail.com>
Date:   Wed, 21 Feb 2018 12:50:38 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] ARM: disallow combining XIP and LTO

On Wed, Feb 21, 2018 at 4:01 AM, Nicolas Pitre <nicolas.pitre@...aro.org> wrote:
> On Tue, 20 Feb 2018, Arnd Bergmann wrote:
>
>> This fails during deflate_xip_data.sh
>>
>>   /home/arnd/cross-gcc/bin/arm-linux-gnueabi-objcopy -O binary -R .comment -S  vmlinux arch/arm/boot/xipImage && /bin/bash -c '/git/arm-soc/arch/arm/boot/deflate_xip_data.sh vmlinux arch/arm/boot/xipImage || { rm -f arch/arm/boot/xipImage; false; }'
>> make -f /git/arm-soc/scripts/Makefile.modpost
>> + sym_val __data_loc
>> + sed -n / __data_loc$/{s/ .*$//p;q}
>> + /home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-nm vmlinux
>> /home/arnd/cross-gcc/lib/gcc/arm-linux-gnueabi/8.0.1/../../../../arm-linux-gnueabi/bin/nm terminated with signal 13 [Broken pipe]
>> + local val=ac74c0f4
>> + [ ac74c0f4 ]
>> + echo 2893332724
>> + __data_loc=2893332724
>> + sym_val _edata_loc
>> + /home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-nm vmlinux
>> + sed -n / _edata_loc$/{s/ .*$//p;q}
>> /home/arnd/cross-gcc/lib/gcc/arm-linux-gnueabi/8.0.1/../../../../arm-linux-gnueabi/bin/nm terminated with signal 13 [Broken pipe]
>> + local val=ac7b8744
>> + [ ac7b8744 ]
>> + echo 2893776708
>> + _edata_loc=2893776708
>> + sym_val _xiprom
>> + sed -n / _xiprom$/{s/ .*$//p;q}
>> + /home/arnd/cross-gcc/bin/arm-linux-gnueabi-gcc-nm vmlinux
>> /home/arnd/cross-gcc/lib/gcc/arm-linux-gnueabi/8.0.1/../../../../arm-linux-gnueabi/bin/nm terminated with signal 13 [Broken pipe]
>>
>> Obviously we want to make the combination work, no idea why it doesn't.
>>
>
> You should move this to config XIP_DEFLATED_DATA instead.

Right, makes sense. I'd still prever nm to not crash, but that would be a small
improvement.

       Arnd