linux-kernel - Re: [patch 0/8] Immediate Values

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: <1186943243.2854.17.camel@laptopd505.fenrus.org>
Date:	Sun, 12 Aug 2007 11:27:23 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 0/8] Immediate Values

On Sun, 2007-08-12 at 11:07 -0400, Mathieu Desnoyers wrote:
> Hi Andrew,
> 
> Here is the latest version of immediate values. It applies on 2.6.23-rc2-mm2 in
> this order:

I have a concern; you seem to be patching potentially "live" code....

there are basically two options
1) you run the risk of triple faulting (patching an instruction while
some other core/cpu may be decoding it may cause a triple fault)
2) you do an IPI to all other cpus and prevent them from executing any
code except a small loop during the patching... this is expensive.

To be honest, neither sound very attractive to me ;(

-
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/