linux-kernel - Re: PTE access rules & abstraction

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: <1222304686.8277.136.camel@pasglop>
Date:	Thu, 25 Sep 2008 11:04:46 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel list <linux-kernel@...r.kernel.org>,
	Nick Piggin <npiggin@...e.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: PTE access rules & abstraction

On Thu, 2008-09-25 at 00:55 +0100, Hugh Dickins wrote:
> 
> Whyever not the latter?  Jeremy seems to have gifted that to you,
> for precisely such a purpose.

Yeah. Not that I don't quite understand what the point of the
start/modify/commit thing the way it's currently used in mprotect since
we are doing the whole transaction for a single PTE change, ie how does
that help with hypervisors vs. a single ptep_modify_protection() for
example is beyond me :-)

When I think about transactions, I think about starting a transaction,
changing a -bunch- of PTEs, then commiting... Essentially I see the PTE
lock thing as being a transaction.

Cheers,
Ben.

> Hugh
> 
> p.s. I surely agree with you over the name ptep_get_and_clear_full():
> horrid, even more confusing than the tlb->fullmm from which it derives
> its name.  I expect I'd agree with you over a lot more too, but
> please, bugfixes first.

Sure.

--
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/