linux-kernel - Re: [PATCH 2/5] x86: fix runtime error in arch/x86/kernel/cpu/mcheck/mce_amd

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Message-ID: <20080128192947.GA6720@cvg>
Date:	Mon, 28 Jan 2008 22:29:47 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Yinghai Lu <yhlu.kernel@...il.com>,
	Jacob Shin <jacob.shin@....com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alexander Viro <viro@....linux.org.uk>
Subject: Re: [PATCH 2/5] x86: fix runtime error in
	arch/x86/kernel/cpu/mcheck/mce_amd_64.c

[Ingo Molnar - Mon, Jan 28, 2008 at 08:01:49PM +0100]
| 
| * Greg KH <gregkh@...e.de> wrote:
| 
| > > Are kobjects protected against accidental copying? If not add &kobj 
| > > to the 'magic value' too, and check that - it becomes 
| > > copying-resistent that way and has the same cost to check. (which is 
| > > negligible anyway)
| > 
| > Oh, that's a very cool idea, I like it :)
| 
| hey, you are welcome :-)
| 
| [ I guess i should not mention that i've implemented list debugging for 
|   Linux that checksums the struct list contents and stores the checksum 
|   in it (offset by a magic value plus to address of the list head), and 
|   thus protects it against accidental corruption? It was capable of 
|   reliably detecting mixed up list_add() arguments for example, it 
|   detected list corruption of _every_ sort, it detected double
|   list_del() and list_add() of an already active list member as well. It
|   was even capable of detecting SMP races: two parallel unserialized
|   list_del()'s on the same list head were detected and warned about as 
|   well. I guess i should release it one of these days? =B-) ]
| 

interesting... something like hash checks in lockdep?

[...snip...]

		- Cyrill -
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