linux-kernel - Re: pci-disable-decode-of-io-memory-during-bar-sizing.patch

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: <alpine.LFD.0.999.0710300811230.30120@woody.linux-foundation.org>
Date:	Tue, 30 Oct 2007 08:15:46 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Robert Hancock <hancockr@...w.ca>
cc:	Greg KH <greg@...ah.com>, Jesse Barnes <jbarnes@...tuousgeek.org>,
	akpm@...ux-foundation.org, ak@...e.de, rajesh.shah@...el.com,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: pci-disable-decode-of-io-memory-during-bar-sizing.patch

On Mon, 29 Oct 2007, Robert Hancock wrote:
> 
> The other possible workaround would be to avoid using MMCONFIG until the BAR
> sizing is done. 

The only sane solution is the one that people constantly seem to ignore:

 - only use MMCONFIG if absolutely required by the access itself

In other words, make the MMCONFIG code fall back on old-style accesses for 
any register access to a word with reg+size <= 256.

At that point, almost all the issues with mmconfig just go away, BECAUSE 
NOBODY USES IT, so it doesn't matter if it's broken?

The fact is, CONF1 style accesses are just safer, and *work*. 

Can we please just do that? 

		Linus
-
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/