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From: Arjan van de Ven <arjan@infradead.org>
To: Dave Jones <davej@redhat.com>
Cc: Pavel Machek <pavel@ucw.cz>, David Howells <dhowells@redhat.com>,
	torvalds@osdl.org, akpm@osdl.org, herbert.xu@redhat.com,
	linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org
Subject: Re: [PATCH 0/6] MODSIGN: Kernel module signing
Date: Fri, 16 Feb 2007 21:27:58 +0100	[thread overview]
Message-ID: <1171657678.12771.645.camel@laptopd505.fenrus.org> (raw)
In-Reply-To: <20070216202135.GA22121@redhat.com>


> 
> The restricted dev/mem patches we've had in Fedora for a while
> do the right thing, but they're a bit crufty (in part due to
> drivers/char/mem.c being a bit of a mess before we even start
> patching it).  I've had "clean these up for upstream" on my
> todo for a while. I might get around to it one of these days.


the real thing is that /dev/mem is too many things for too many people.
Fundamentally it has 3 components
1) ram-but-not-kernel data: basically BIOS datastructures
2) kernel visible ram: user/kernel data, this has all the nasty cache
coherency issues. This is also a "debug only" use, and "rootkit only"
sometimes ;) 
3) MMIO space: this really should not be used anymore, sysfs provides a
MUCH better interface and it also breaks if you have enforcing IOMMU's
in the system... it can't really work since the kernel doesn't get told
which device is being accessed

unless we split this up (well the third is split already) it's going to
remain a big mess.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org


  reply	other threads:[~2007-02-16 20:28 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-14 19:09 David Howells
2007-02-14 19:09 ` [PATCH 2/6] MODSIGN: In-kernel crypto extensions David Howells
2007-02-14 19:09 ` [PATCH 3/6] MODSIGN: Add indications of module ELF types David Howells
2007-02-14 19:09 ` [PATCH 4/6] MODSIGN: Module ELF verifier David Howells
2007-02-14 19:10 ` [PATCH 5/6] MODSIGN: Module signature checker and key manager David Howells
2007-02-14 19:10 ` [PATCH 6/6] MODSIGN: Apply signature checking to modules on module load David Howells
2007-02-14 19:26 ` [PATCH 0/6] MODSIGN: Kernel module signing Linus Torvalds
2007-02-14 19:40 ` David Howells
2007-02-14 21:32   ` Michael Halcrow
2007-02-14 21:59   ` David Howells
2007-02-14 22:21     ` Michael Halcrow
2007-02-15 21:31   ` Indan Zupancic
2007-02-15  3:41 ` Andrew Morton
2007-02-15  4:13   ` Dave Jones
2007-02-15  5:35     ` Andreas Gruenbacher
2007-02-15  5:45       ` Dave Jones
2007-02-15  6:14         ` Andreas Gruenbacher
2007-02-15  6:22           ` Dave Jones
2007-02-15 20:34           ` Valdis.Kletnieks
2007-02-15 22:12             ` Andreas Gruenbacher
2007-02-16  0:15               ` Olaf Kirch
2007-02-15 22:10           ` Pavel Machek
2007-02-15 20:55     ` Valdis.Kletnieks
2007-02-15 21:32       ` Adrian Bunk
2007-02-15 22:12         ` Valdis.Kletnieks
2007-02-15 14:35 ` Roman Zippel
2007-02-15 17:32 ` David Howells
2007-02-15 18:33   ` Roman Zippel
2007-02-15 20:01     ` David Lang
2007-02-15 21:01       ` Roman Zippel
2007-02-15 21:03 ` Adrian Bunk
2007-02-15 22:13 ` Pavel Machek
2007-02-16 20:21   ` Dave Jones
2007-02-16 20:27     ` Arjan van de Ven [this message]
     [not found] <7OPWh-470-9@gated-at.bofh.it>
     [not found] ` <7OxPF-16i-7@gated-at.bofh.it>
     [not found]   ` <7OSKA-8A-17@gated-at.bofh.it>
     [not found]     ` <7OTGJ-1G5-23@gated-at.bofh.it>
2007-02-16 15:38       ` Bodo Eggert

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