linux-kernel - Re: [PATCH v3 06/10] arm64: efi: add EFI stub

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:   Wed, 8 Feb 2017 10:35:02 -0600
From:   Timur Tabi <timur@...eaurora.org>
To:     Ard Biesheuvel <ard.biesheuvel@...aro.org>
Cc:     Leif Lindholm <leif.lindholm@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>, linux-efi@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>,
        Mark Salter <msalter@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH v3 06/10] arm64: efi: add EFI stub

On 02/08/2017 10:29 AM, Ard Biesheuvel wrote:
>>> >> +       status = handle_cmdline_files(sys_table, image, cmdline_ptr,
>>> >> +                                     "initrd=", dram_base + SZ_512M,
>>> >> +                                     (unsigned long *)&initrd_addr,
>>> >> +                                     (unsigned long *)&initrd_size);
>> >
>> > So I know this patch is almost three years old, but why is there a
>> > 512M limit on the initrd size?
>> >
> How do you reckon this constitutes a limit?

handle_cmdline_files() calls efi_high_alloc() with that limit.  I'm still 
trying to understand all the details myself, but apparently our firmware and 
initrd need to fit within the first 512MB because of dram_base + SZ_512M. 
When we change "dram_base + SZ_512M" to "~0", everything works.

-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.