linux-kernel - Re: [PATCH] x86/uaccess: restore get_user exception type to EX_TYPE

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Message-ID: <20220331175113.GV8939@worktop.programming.kicks-ass.net>
Date:   Thu, 31 Mar 2022 19:51:13 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Youquan Song <youquan.song@...ux.intel.com>
Cc:     Tony Luck <tony.luck@...el.com>, Borislav Petkov <bp@...en8.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Zhiquan Li <zhiquan1.li@...el.com>,
        Youquan Song <youquan.song@...el.com>
Subject: Re: [PATCH] x86/uaccess: restore get_user exception type to
 EX_TYPE_UACCESS

On Thu, Mar 31, 2022 at 07:31:25PM +0800, Youquan Song wrote:
> > Did you do your testing on RHEL or something daft like that?
> Tested on RHEL8.x

Right; the home of obsolete software.. :-)

> > Something like the below can also work, I suppose. But please, add
> > coherent comments to the extable code with useful references to the MCE
> > code that does this abuse.
> Here is the full fix patch depending on your suggestion. Thanks a lot!

Did you verify this was indeed the only UACCESS I lost?

I'm also failing to spot a comment making extable users aware of this
abuse.