linux-kernel - Re: x86-32: Early microcode loading stumbles over disabled DYNAMIC

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <521B16B9.4000203@siemens.com>
Date:	Mon, 26 Aug 2013 10:50:01 +0200
From:	Jan Kiszka <jan.kiszka@...mens.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	Fenghua Yu <fenghua.yu@...el.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	H Peter Anvin <hpa@...or.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	x86 <x86@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: x86-32: Early microcode loading stumbles over disabled DYNAMIC_FTRACE

On 2013-08-23 22:17, Borislav Petkov wrote:
> On Fri, Aug 23, 2013 at 06:40:46PM +0200, Jan Kiszka wrote:
>> Below some hunks to get it working again - at least in the absence of
>> any microcode in the initrd. Marking all involved functions as __init
>> is another option (as __init implies notrace). But I bet there is more
>> hidden. I see e.g. a pr_warn() in find_cpio_init that should trigger
>> the issue as well if we hit the error it reports (btw. printing at
>> this point of the boot should not work anyway, should it?).
> 
> I guess we can do early_printk there instead as x86_64_start_kernel()
> does it but I'm not sure for the 32-bit case where we call
> load_ucode_bsp/ap before we've even enabled paging.

early_printk doesn't seem to work as well on 32-bit until paging was
enabled.

Jan

-- 
Siemens AG, Corporate Technology, CT RTC ITP SES-DE
Corporate Competence Center Embedded Linux
--
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/