From: Al Viro <viro@zeniv.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jason Wang <jasowang@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH RFC] uaccess: user_access_begin_after_access_ok()
Date: Tue, 2 Jun 2020 18:46:23 +0100 [thread overview]
Message-ID: <20200602174623.GO23230@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200602174430.GN23230@ZenIV.linux.org.uk>
On Tue, Jun 02, 2020 at 06:44:30PM +0100, Al Viro wrote:
> On Tue, Jun 02, 2020 at 10:18:09AM -0700, Linus Torvalds wrote:
>
>
> > You have exactly two cases:
> >
> > (a) the access_ok() would be right above the code and can't be missed
> >
> > (b) not
>
> (c) what you really want is not quite access_ok().
>
> Again, that "not quite access_ok()" should be right next to STAC, and
> come from the same primitive - I'm not saying the current model is
> anywhere near sane. We need a range-checking primitive right next
> to memory access; it's just that for KVM and vhost we might want
> a different check and, for things like s390 and sparc (mips as well,
things like vhost on s390 and sparc, that is.
> in some configs), potentially different part that would do the memory
> access itself as well.
next prev parent reply other threads:[~2020-06-02 17:46 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 8:45 [PATCH RFC] uaccess: user_access_begin_after_access_ok() Michael S. Tsirkin
2020-06-02 10:15 ` Jason Wang
2020-06-02 16:33 ` Al Viro
2020-06-02 17:18 ` Linus Torvalds
2020-06-02 17:44 ` Al Viro
2020-06-02 17:46 ` Al Viro [this message]
2020-06-02 20:32 ` Michael S. Tsirkin
2020-06-02 20:41 ` David Laight
2020-06-02 21:58 ` Al Viro
2020-06-03 8:08 ` David Laight
2020-06-02 20:43 ` Linus Torvalds
2020-06-03 6:01 ` Michael S. Tsirkin
[not found] ` <CAHk-=wi3=QuD30fRq8fYYTj9WmkgeZ0VR_Sh3DQHU+nmwj-jMg@mail.gmail.com>
2020-06-03 16:59 ` Linus Torvalds
2020-06-02 16:30 ` Al Viro
2020-06-02 20:42 ` Michael S. Tsirkin
2020-06-02 22:10 ` Al Viro
2020-06-03 5:17 ` Michael S. Tsirkin
2020-06-03 1:48 ` Al Viro
2020-06-03 3:57 ` Jason Wang
2020-06-03 4:18 ` Al Viro
2020-06-03 5:18 ` Jason Wang
2020-06-03 5:46 ` Michael S. Tsirkin
2020-06-03 6:23 ` Jason Wang
2020-06-03 6:30 ` Michael S. Tsirkin
2020-06-03 6:36 ` Jason Wang
2020-06-04 16:49 ` Michael S. Tsirkin
2020-06-05 10:03 ` Jason Wang
2020-06-06 20:08 ` Michael S. Tsirkin
2020-06-03 6:25 ` Michael S. Tsirkin
2020-06-03 5:29 ` Michael S. Tsirkin
2020-06-03 16:52 ` Al Viro
2020-06-04 6:10 ` Jason Wang
2020-06-04 14:59 ` Al Viro
2020-06-04 16:46 ` Michael S. Tsirkin
2020-06-04 10:10 ` Michael S. Tsirkin
2020-06-04 15:03 ` Al Viro
2020-06-04 16:47 ` Michael S. Tsirkin
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