linux-kernel - Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails

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]

Date:	Mon, 23 Mar 2015 14:34:42 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Petr Mladek <pmladek@...e.cz>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Ananth NMavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 23 Mar 2015 13:39:55 +0100
> Petr Mladek <pmladek@...e.cz> wrote:
> 
> 
> > > wth is a 'universe' in this context?
> > 
> > We use the term "universe" to define whether the system or task uses
> > original or patched functions. It is especially important for patches
> > that modify semantic of functions. They need more complex consistency
> > model. It defines when it is safe time for the system or task to start
> > using the new functions (switch to the new universe).
> > 
> > In theory, different tasks might be in more universes if more patches are
> > being applied. In practice, we deal with only two universes. The trick is
> > that we allow to add new patch only when the whole system has switched
> > to the previous one.
> > 
> 
> Is this terminology documented anywhere upstream yet?

Even if it was documented (it isn't), it's pretty weird terminology - 
please use clearer formulations, like 'patched function' or 'unpatched 
function' or 'function with pending patch'. No need to redefine 
existing words in a weird fashion just to create the appearance of 
being special ...

Thanks,

	Ingo
--
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/