linux-kernel - Re: objtool clac/stac handling change..

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: <20200702140159.GM2786714@ZenIV.linux.org.uk>
Date:   Thu, 2 Jul 2020 15:01:59 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christophe Leroy <christophe.leroy@....fr>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: objtool clac/stac handling change..

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()...