linux-kernel - Re: how to tell i386 from x86-64 kernel

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: <20080209143430.193131d8@laptopd505.fenrus.org>
Date:	Sat, 9 Feb 2008 14:34:30 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Jan Engelhardt <jengelh@...putergmbh.de>
Cc:	Alejandro Riveira Fernández 
	<ariveira@...il.com>, Ray Lee <ray-lk@...rabbit.org>,
	Pavel Machek <pavel@....cz>,
	kernel list <linux-kernel@...r.kernel.org>, jikos@...e.cz
Subject: Re: how to tell i386 from x86-64 kernel

On Sat, 9 Feb 2008 21:13:43 +0100 (CET)
Jan Engelhardt <jengelh@...putergmbh.de> wrote:

> 
> On Feb 1 2008 12:53, Alejandro Riveira Fernández wrote:
> >> 
> >> # uname -m
> >> I won't tell you.
> >> # linux32 uname -m
> >> i686
> >
> > Ubuntu 7.10 64 bit userland 2.6.24
> >
> >$ uname -m
> >x86_64
> >$ linux32 uname -m
> >i686
> 
> What I am saying is that uname(2) does not reliably tell you whether
> you have a 64-bit kernel underneath unless you have other sources of 
> information.

that's sort of a rabbit-and-the-frog problem. The 32 bit emulator tries to
look EXACTLY like the 32 bit kernel, and it really should.
If someone wants a method to detect even that... we would really want
to know the exact usecase.. because very likely it's the wrong answer
to some other problem ;-)

-- 
If you want to reach me at my work email, use arjan@...ux.intel.com
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
--
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/