linux-kernel - Re: [patch 8/9] F00F bug fixup for i386

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:	Thu, 31 May 2007 17:07:55 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [patch 8/9] F00F bug fixup for i386 - use conditional calls

* Andrew Morton (akpm@...ux-foundation.org) wrote:
 
> > Use the faster conditional calls for F00F bug handling in do_page_fault.
> > 
> 
> I guess this means that CONDCALL will be enabled on pretty much all i386,
> in which case making the whole feature Kconfigurable is starting to look
> marginal.
> 
> Perhaps a better approach would have to made this change dependent upon
> CONDCALL, rather than forcing it on.
> 

Do you mean making X86_F00F_BUG depend on COND_CALL instead of selecting
it ?

> > +	if (cond_call(fix_f00f, do_f00f_workaround(regs, address)))
> > +		return;
> 
> We do a cond_call() to an inlined function?  That's a bit weird, isn't it?
> 

Yes, but it works :) I will add this information to the documentation.

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
-
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/