linux-kernel - Re: Bug in patch "x86/pti: Add the pti= cmdline option and documentation"

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Date:   Fri, 22 Dec 2017 17:43:34 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Juergen Gross <jgross@...e.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: Bug in patch "x86/pti: Add the pti= cmdline option and
 documentation"

On Fri, Dec 22, 2017 at 05:41:32PM +0100, Juergen Gross wrote:
> The patch in the tip tree with commit 506bcdf68b07a0335751e1fe8be37
> ("x86/pti: Add the pti= cmdline option and documentation") is completely
> wrong: cmdline_find_option() will return -1 in case the otion isn't
> found and the len of the argument in case it has been found.

It is not completely wrong - we still walk into the if-branch. Besides,
we moved the xen check upwards, before that so it is not relevant for
the xen case.

Regardless, I'll send a correction soon to check the retval directly.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--