linux-kernel - Re: [PATCH] ARM: hw_breakpoint: Handle inexact watchpoint addresses

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Date:   Thu, 6 Aug 2020 16:41:44 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>,
        Pratyush Anand <panand@...hat.com>,
        Pavel Labath <labath@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Kazuhiro Inaba <kinaba@...gle.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] ARM: hw_breakpoint: Handle inexact watchpoint addresses

On Thu, Aug 06, 2020 at 08:05:10AM -0700, Doug Anderson wrote:
> Hi,
> 
> On Mon, Dec 2, 2019 at 8:36 AM Doug Anderson <dianders@...omium.org> wrote:
> >
> > Hi,
> >
> > On Wed, Nov 20, 2019 at 11:18 AM Will Deacon <will@...nel.org> wrote:
> > >
> > > On Sat, Oct 19, 2019 at 11:12:26AM -0700, Douglas Anderson wrote:
> > > > This is commit fdfeff0f9e3d ("arm64: hw_breakpoint: Handle inexact
> > > > watchpoint addresses") but ported to arm32, which has the same
> > > > problem.
> > > >
> > > > This problem was found by Android CTS tests, notably the
> > > > "watchpoint_imprecise" test [1].  I tested locally against a copycat
> > > > (simplified) version of the test though.
> > > >
> > > > [1] https://android.googlesource.com/platform/bionic/+/master/tests/sys_ptrace_test.cpp
> > > >
> > > > Signed-off-by: Douglas Anderson <dianders@...omium.org>
> > > > ---
> > > >
> > > >  arch/arm/kernel/hw_breakpoint.c | 96 ++++++++++++++++++++++++---------
> > > >  1 file changed, 70 insertions(+), 26 deletions(-)
> > >
> > > Sorry for taking so long to look at this. After wrapping my head around the
> > > logic again
> >
> > Yeah.  It was a little weird and (unfortunately) arbitrarily different
> > in some places compared to the arm64 code.
> >
> >
> > > I think it looks fine, so please put it into the patch system
> > > with my Ack:
> > >
> > > Acked-by: Will Deacon <will@...nel.org>
> >
> > Thanks!  Submitted as:
> >
> > https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8944/1
> 
> Oddly, I found that if I go visit that page now I see:
> 
> > - - - Note 2 submitted by Russell King on 17 Jan 2020 11:16:34 (UTC) - - -
> > Moved to applied
> >
> > Applied to git-curr (misc branch).
> 
> Yet if I go check mainline the patch is not there.  This came to my
> attention since we had my patch picked to the Chrome OS 4.19 tree and
> suddenly recently got a stable merge conflict with "ARM: 8986/1:
> hw_breakpoint: Don't invoke overflow handler on uaccess watchpoints".
> 
> Anyone know what happened here?

Yes.  Stephen Rothwell raised a complaint against it, which you were
copied with:

> Hi all,
> 
> Commit
> 
>   116375be0461 ("ARM: 8944/1: hw_breakpoint: Handle inexact watchpoint addresses")
> 
> is missing a Signed-off-by from its author.

My reply to Stephen's email was:

> Thanks Stephen, patch dropped.
> 
> It looks like Doug used his "m.disordat.com" address to submit the
> patch through the web interface, and there was no From: in the patch
> itself, so that was used as the patch author.  However, as you spotted,
> it was signed off using Doug's "chromium.org" address.
> 
> I think it's time to make the patch system a bit more strict, checking
> that the submission address is mentioned in a signed-off-by tag
> somewhere in the commit message.
> 
> Doug, the patch system does have your "chromium.org" address, if that's
> the one you want to use as the author, please submit using that instead.
> Thanks.
> 
> Russell.

Neither email got a response from you, so the patch was dropped and
nothing further happened.

-- 
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