linux-kernel - Re: [Xen-devel] EFI and multiboot2 devlopment work for Xen

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:	Tue, 22 Oct 2013 12:26:32 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	grub-devel@....org, keir@....org, david.woodhouse@...el.com,
	stefano.stabellini@...citrix.com,
	Daniel Kiper <daniel.kiper@...cle.com>,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xen.org,
	Jan Beulich <JBeulich@...e.com>,
	Peter Jones <pjones@...hat.com>, ross.philipson@...rix.com,
	boris.ostrovsky@...cle.com, richard.l.maliszewski@...el.com
Subject: Re: [Xen-devel] EFI and multiboot2 devlopment work for Xen

On Tue, Oct 22, 2013 at 04:22:38PM +0100, Ian Campbell wrote:
> On Tue, 2013-10-22 at 15:24 +0100, Ian Campbell wrote:
> > On Tue, 2013-10-22 at 10:09 -0400, Konrad Rzeszutek Wilk wrote:
> > 
> > > So it can be booted the same way as xen.efi. But my understanding is
> > > that folks prefer a bootloader instead of loading the bzImage in an
> > > NVRAM of a platform with pre-set parameters. Hence that mechanism
> > > is not used by the majority of users.
> > 
> > My understanding is that they prefer a bootloader which can launch Linux
> > as a PE/COFF image, i.e. the linuxefi thing.
> 
> What I'm trying to say here is that from the xen.efi or linux.efi point
> of view it can't tell if it was launched directly from the EFI shell or
> by some intermediate bootloader (i.e. by grub2's linuxefi command).

It can (at least in Linux). There are two entry points in the Linux kernel
and - one when it is launched from 'linuxefi' (See efi_stub_entry in 
arch/x86/boot/compressed/head_64.S), the other when it is launched
from an EFI shell - see efi_pe_entry in arch/x86/boot/compressed/head_64.S.
--
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/