linux-kernel - Re: [PATCH] MIPS: Validate PR_SET_FP_MODE prctl(2) requests against the ABI of the task

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Message-ID: <alpine.DEB.2.00.1711292017300.31156@tp.orcam.me.uk>
Date:   Wed, 29 Nov 2017 20:20:35 +0000
From:   "Maciej W. Rozycki" <macro@...s.com>
To:     Paul Burton <paul.burton@...s.com>
CC:     Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <james.hogan@...s.com>,
        <linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH] MIPS: Validate PR_SET_FP_MODE prctl(2) requests against
 the ABI of the task

Hi Paul,

> >  That written, I could make it 1/2 with the ABI checks becoming 2/2, but 
> > then 1/2 wouldn't make sense on its own (except perhaps as a 
> > microoptimisation, but that would be an entirely different purpose) and 
> > would have to be considered in conjunction with 2/2 anyway.
> 
> Ah - OK, I see. Prior to this patch the value returned by PR_GET_FP_MODE
> would always be one accepted by PR_SET_FP_MODE anyway, but with the
> patch that will cease to be true for non-o32 ABIs without the special
> case. Gotcha.

 And also for !CONFIG_MIPS_O32_FP64_SUPPORT.

> > > Both changes look good to me though, so feel free to add:
> > > 
> > >     Reviewed-by: Paul Burton <paul.burton@...s.com>
> > 
> >  Thanks for your review.  Do you feel convinced with the justification I 
> > gave?
> 
> Yes - I follow, please consider the Reviewed-by tag valid for the patch
> as-is.

 Great!  Thanks again for your review.

  Maciej