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From: Al Viro <viro@zeniv.linux.org.uk>
To: Michael Ellerman <mpe@ellerman.id.au>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Christophe Leroy <christophe.leroy@c-s.fr>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	the arch/x86 maintainers <x86@kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: objtool clac/stac handling change..
Date: Thu, 2 Jul 2020 15:04:47 +0100	[thread overview]
Message-ID: <20200702140447.GN2786714@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20200702140159.GM2786714@ZenIV.linux.org.uk>

On Thu, Jul 02, 2020 at 03:01:59PM +0100, Al Viro wrote:
> On Thu, Jul 02, 2020 at 11:34:31PM +1000, Michael Ellerman wrote:
> 
> > I think we can do something to make it work.
> > 
> > We don't have an equivalent of x86's ex_handler_uaccess(), so it's not
> > quite as easy as whacking a user_access_end() in there.
> > 
> > Probably the simplest option for us is to just handle it in our
> > unsafe_op_wrap(). I'll try and come up with something tomorrow.
> 
> The goal is to avoid using unsafe_op_wrap()...

Incidentally, the change Linus proposes would affect unsafe_put_user()
as well.  And you are not using unsafe_op_wrap() anywhere on that
path...

  reply	other threads:[~2020-07-02 14:04 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-01 18:22 objtool clac/stac handling change Linus Torvalds
2020-07-01 18:29 ` Andy Lutomirski
2020-07-01 19:35   ` Linus Torvalds
2020-07-01 20:36     ` Andy Lutomirski
2020-07-01 20:51       ` Josh Poimboeuf
2020-07-01 21:02         ` Linus Torvalds
2020-07-02  0:00           ` Josh Poimboeuf
2020-07-02  8:05             ` Peter Zijlstra
2020-07-01 20:51       ` Linus Torvalds
2020-07-02  0:47         ` Andy Lutomirski
2020-07-02  2:30           ` Linus Torvalds
2020-07-02  2:35             ` Linus Torvalds
2020-07-02  3:08             ` Andy Lutomirski
2020-07-01 18:41 ` Al Viro
2020-07-01 19:04   ` Linus Torvalds
2020-07-01 19:59     ` Al Viro
2020-07-01 20:25       ` Linus Torvalds
2020-07-02 13:34         ` Michael Ellerman
2020-07-02 14:01           ` Al Viro
2020-07-02 14:04             ` Al Viro [this message]
2020-07-02 15:13           ` Christophe Leroy
2020-07-02 20:13             ` Linus Torvalds
2020-07-03  3:59               ` Michael Ellerman
2020-07-03  3:17             ` Michael Ellerman
2020-07-03  5:27               ` Christophe Leroy
2020-07-03  5:27                 ` Christophe Leroy
2020-07-02 19:52           ` Linus Torvalds
2020-07-02 20:17             ` Al Viro
2020-07-02 20:32               ` Linus Torvalds
2020-07-02 20:59                 ` Al Viro
2020-07-02 21:55                   ` Linus Torvalds
2020-07-03  1:33                     ` Al Viro
2020-07-03  3:32                       ` Linus Torvalds
2020-07-03 21:02                       ` Al Viro
2020-07-03 21:10                         ` Linus Torvalds
2020-07-03 21:41                           ` Andy Lutomirski
2020-07-03 22:25                             ` Al Viro
2020-07-03 21:59                           ` Al Viro
2020-07-03 22:04                             ` Al Viro
2020-07-03 22:12                           ` Al Viro
2020-07-04  0:49                         ` Al Viro
2020-07-04  1:54                           ` Linus Torvalds
2020-07-04  2:30                             ` Al Viro
2020-07-04  3:06                               ` Linus Torvalds
2020-07-04  2:11                           ` Al Viro
2020-07-07 12:35                             ` David Laight
2020-07-10 22:37                               ` Linus Torvalds
2020-07-13  9:32                                 ` David Laight

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