linux-kernel - Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

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: <CALCETrXban-Yk1e95Yy2-fXtudjBmKGFsLMjuB+zPCpxDP3OYg@mail.gmail.com>
Date:	Fri, 27 Jun 2014 11:57:15 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Dave Hansen <dave.hansen@...el.com>
Cc:	"Ren, Qiaowei" <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v6 02/10] x86, mpx: add MPX specific mmap interface

On Fri, Jun 27, 2014 at 10:42 AM, Dave Hansen <dave.hansen@...el.com> wrote:
> On 06/27/2014 10:34 AM, Dave Hansen wrote:
>> I'm claiming that we need COW behavior for the bounds tables, at least
>> by default.  If userspace knows enough about the ways that it is using
>> the tables and knows how to share them, let it go to town.  The kernel
>> will permit this kind of usage model, but we simply won't be helping
>> with the management of the tables when userspace creates them.
>
> Actually, this is another reason we need to mark VMAs as being
> MPX-related explicitly instead of inferring it from the tables.  If
> userspace does something really specialized like this, the kernel does
> not want to confuse these VMAs the ones it created.
>

Good point.

--Andy
--
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/