linux-kernel - Re: [RFC][PATCH 0/5] arch: atomic rework

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:	Sun, 9 Feb 2014 16:56:26 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Torvald Riegel <triegel@...hat.com>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Will Deacon <will.deacon@....com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
	David Howells <dhowells@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"gcc@....gnu.org" <gcc@....gnu.org>
Subject: Re: [RFC][PATCH 0/5] arch: atomic rework

On Sun, Feb 9, 2014 at 4:27 PM, Torvald Riegel <triegel@...hat.com> wrote:
>
> I wouldn't characterize the situation like this (although I can't speak
> for others, obviously).  IMHO, it's perfectly fine on sequential /
> non-synchronizing code, because we know the difference isn't observable
> by a correct program.

What BS is that? If you use an "atomic_store_explicit()", by
definition you're either

 (a) f*cking insane
 (b) not doing sequential non-synchronizing code

and a compiler that assumes that the programmer is insane may actually
be correct more often than not, but it's still a shit compiler.
Agreed?

So I don't see how any sane person can say that speculative writes are
ok. They are clearly not ok.

Speculative stores are a bad idea in general. They are completely
invalid for anything that says "atomic". This is not even worth
discussing.

                Linus
--
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/