linux-kernel - Re: [PATCH v3 08/12] x86, boot: Don't check if cmd_line

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: <50AD0D85.5070906@zytor.com>
Date:	Wed, 21 Nov 2012 09:21:09 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 08/12] x86, boot: Don't check if cmd_line_ptr is accessible
 in misc/decompressor()

On 11/20/2012 11:16 PM, Yinghai Lu wrote:
> At that stage, it is already in 32bit protected mode or 64bit mode.
> so we do not need to check if ptr less 1M.
>
> When go from other boot loader (kexec) instead of boot/ code path.
>
> Move out accessible checking out __cmdline_find_option....
>
> So misc.c will parse cmdline and have debug print out.

Your description doesn't seem to match the code, and is incredibly 
confusing to the reader.

The reason why is because you leave out an essential piece of 
information: cmdline.c is included both in 16-bit code and in the 
decompressor (32/64-bit code), so you want to move the test out of the 
shared code.

	-hpa
-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

--
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/