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From: "H. Peter Anvin" <hpa@zytor.com>
To: Kees Cook <keescook@chromium.org>, Dave Young <dyoung@redhat.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: kaslr should avoid setup_data region
Date: Thu, 24 Apr 2014 16:46:11 -0700	[thread overview]
Message-ID: <5359A243.9010606@zytor.com> (raw)
In-Reply-To: <CAGXu5jKaog6X+jw6Zh3iHSHS8KFUbLEHm75=HbVORJ-crpr7Fw@mail.gmail.com>

On 04/24/2014 03:50 PM, Kees Cook wrote:
> Ah, it sounds like boot_params.hdr.setup_data contains a series of
> e820-like entries chained together as a linked list? Which loaders
> currently populate that? Looks like EFI? Seems like
> arch/x86/boot/compressed/eboot.c works on setup_data at least.
> 
> I won't be in a position to test EFI booting for a while. If someone
> else took this, that would make it get fixed much faster.
> 
> Do you have examples where this is actually causing failures?
> 
> -Kees

Syslinux can populate it with arbitrary data; in particular Syslinux
uses it to pass FDT information if requested.

	-hpa



  reply	other threads:[~2014-04-24 23:46 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-04-24  2:35 kaslr should avoid setup_data region Dave Young
2014-04-24  2:43 ` Kees Cook
2014-04-24  2:50   ` Dave Young
2014-04-24 22:50     ` Kees Cook
2014-04-24 23:46       ` H. Peter Anvin [this message]
2014-04-25  9:44       ` Dave Young
2014-05-05  8:58       ` Dave Young
2014-05-08  9:46       ` Dave Young
2014-05-08 19:31         ` Kees Cook
2014-05-09  3:21           ` Dave Young

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