From: Linus Torvalds <torvalds@linux-foundation.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>, Oleg Nesterov <oleg@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
Brian Gerst <brgerst@gmail.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: Rethinking sigcontext's xfeatures slightly for PKRU's benefit?
Date: Fri, 18 Dec 2015 13:09:58 -0800 [thread overview]
Message-ID: <CA+55aFzJ+cXgezVu_wU462wCp=pDO_O=M6ShbxJjcuXUNRwEJQ@mail.gmail.com> (raw)
In-Reply-To: <CA+55aFz9XdUP0BQXuq7UuZT1ke-+JVThs-bssMi2sV2xLubHVg@mail.gmail.com>
On Fri, Dec 18, 2015 at 1:04 PM, Linus Torvalds
<torvalds@linux-foundation.org> wrote:
>
> I do wonder if you need an explicit value, though. I think it's
> reasonable to say that PKRU value 0 is special. It's what we'd start
> processes with, and why not just say that it's what we run signal
> handlers in?
>
> Would any other value ever make sense, really?
Ahh. Your point about the PROT_EXEC handling means that maybe we don't
want to default to zero. Maybe we want to make the default PKRU
startup value be 1 instead, enabling access disable key for key 0?
Linus
next prev parent reply other threads:[~2015-12-18 21:10 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-18 1:48 Rethinking sigcontext's xfeatures slightly for PKRU's benefit? Andy Lutomirski
2015-12-18 2:13 ` Dave Hansen
2015-12-18 2:32 ` Andy Lutomirski
2015-12-18 2:52 ` Dave Hansen
2015-12-18 5:29 ` Andy Lutomirski
2015-12-18 6:43 ` H. Peter Anvin
2015-12-18 16:04 ` Andy Lutomirski
2015-12-18 16:56 ` Dave Hansen
2015-12-18 18:42 ` Dave Hansen
2015-12-18 19:21 ` Andy Lutomirski
2015-12-18 20:07 ` Dave Hansen
2015-12-18 20:28 ` Andy Lutomirski
2015-12-18 20:37 ` Linus Torvalds
2015-12-18 20:49 ` Andy Lutomirski
2015-12-18 20:58 ` H. Peter Anvin
2015-12-18 21:02 ` Andy Lutomirski
2015-12-18 21:08 ` Dave Hansen
2015-12-18 21:04 ` Linus Torvalds
2015-12-18 21:09 ` Linus Torvalds [this message]
2015-12-18 21:12 ` Dave Hansen
2015-12-18 21:45 ` Linus Torvalds
2015-12-18 22:28 ` Andy Lutomirski
2015-12-18 23:08 ` Linus Torvalds
2015-12-18 23:16 ` Andy Lutomirski
2015-12-18 23:20 ` Linus Torvalds
2015-12-21 17:04 ` Dave Hansen
2015-12-21 22:52 ` Andy Lutomirski
2015-12-21 23:00 ` Dave Hansen
2015-12-21 23:02 ` Andy Lutomirski
2015-12-21 23:05 ` Dave Hansen
2015-12-21 23:04 ` Dave Hansen
2015-12-21 23:07 ` Andy Lutomirski
2016-06-30 17:36 ` Andy Lutomirski
2016-06-30 21:25 ` Dave Hansen
2016-07-01 16:30 ` Andy Lutomirski
2015-12-29 23:48 ` Dave Hansen
2015-12-18 8:32 ` Ingo Molnar
2015-12-18 8:59 ` Christoph Hellwig
2015-12-18 12:57 ` Borislav Petkov
2016-01-12 13:38 ` Ingo Molnar
2016-01-12 13:42 ` Christoph Hellwig
2016-01-13 10:48 ` Ingo Molnar
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