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] [day] [month] [year] [list]
Message-ID: <20080827035501.4b8cc732@infradead.org>
Date:	Wed, 27 Aug 2008 03:55:01 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: PATCH] debug: add notifier chain debugging

On Wed, 27 Aug 2008 08:39:15 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Arjan van de Ven <arjan@...radead.org> wrote:
> 
> > The patch below fixes this;
> > Ingo, please replace the patch with this one.
> 
> well, this one is now less than cheap on x86:

really it isn't; dereference_function_descriptor is a fall through and
basically free.

> 
> as it's rather large. So i kept the config option, and it defaults to 
> off.

huh? the consensus was that the config needed to go ... nothing changed
on that front. I agree absolutely with not introducing config options
for things that don't need it; we have too many already anyway.


> 
> > +		if (!func_ptr_is_kernel_text(nb->notifier_call)) {
> > +			WARN(1, "Invalid notifier called!");
> > +			nb = next_nb;
> > +			continue;
> > +		}
> 
> and that should be an unlikely() too i guess.

please do not add new unlikely()'s to the kernel.. not on non-hotpaths
at least

--
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/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ