linux-kernel - Re: [PATCH 5/6] objtool: Add UACCESS validation

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Message-ID: <20190225173859.zs5k5bbkdruqk6pa@treble>
Date:   Mon, 25 Feb 2019 11:38:59 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Julien Thierry <julien.thierry@....com>,
        Will Deacon <will.deacon@....com>,
        Ingo Molnar <mingo@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>, valentin.schneider@....com,
        Brian Gerst <brgerst@...il.com>,
        Andrew Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] objtool: Add UACCESS validation

On Mon, Feb 25, 2019 at 06:15:31PM +0100, Peter Zijlstra wrote:
> Also, I think at the time we didn't use it because backporting efforts.

This part may have been my fault.  I spread a vicious rumor (based on
reading docs instead of code) that old versions of GCC don't support
'%='.  But it's actually been around since GCC 2.8.

-- 
Josh