From: "H. Peter Anvin" <hpa@zytor.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Richard Weinberger <richard@nod.at>,
Linux-Arch <linux-arch@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>
Subject: Re: VERIFY_READ/WRITE in uaccess.h?
Date: Mon, 11 May 2015 22:47:19 -0700 [thread overview]
Message-ID: <555193E7.30600@zytor.com> (raw)
In-Reply-To: <CA+55aFzF+Wo7EVSoJSaarbsQCNw5St4JH27t6vxNJivJnBQ0Sg@mail.gmail.com>
On 05/11/2015 02:42 PM, Linus Torvalds wrote:
>
> That one - for the same reasons - also checked the actual accesses,
> not just that the range was in user mode. Exactly because it needed to
> pre-COW the pages (even if that was then obviously racy in threaded
> environments - in practice it worked, and we tried to support the
> fundamentally broken i386 hardware protection model for a long time).
>
It worked in part because we never supported SMP on i386.
-hpa
prev parent reply other threads:[~2015-05-12 5:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-10 9:44 VERIFY_READ/WRITE in uaccess.h? Richard Weinberger
2015-05-11 21:05 ` H. Peter Anvin
2015-05-11 21:26 ` Richard Weinberger
2015-05-11 21:42 ` Linus Torvalds
2015-05-12 5:47 ` H. Peter Anvin [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=555193E7.30600@zytor.com \
--to=hpa@zytor.com \
--cc=arnd@arndb.de \
--cc=linux-arch@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=richard@nod.at \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.