linux-kernel - Re: Dangerous addr to ctrl dependency transformation in fs/nfs/delegation.c::nfs_server_return_marked

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Message-ID: <20220415142059.GI4285@paulmck-ThinkPad-P17-Gen-1>
Date:   Fri, 15 Apr 2022 07:20:59 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Paul Heidekrüger <paul.heidekrueger@...tum.de>,
        Alan Stern <stern@...land.harvard.edu>,
        Andrea Parri <parri.andrea@...il.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Akira Yokosawa <akiyks@...il.com>,
        Daniel Lustig <dlustig@...dia.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        llvm@...ts.linux.dev, Marco Elver <elver@...gle.com>,
        Charalampos Mainas <charalampos.mainas@...il.com>,
        Pramod Bhatotia <pramod.bhatotia@...tum.de>,
        "Jose E. Marchesi" <jemarch@....org>
Subject: Re: Dangerous addr to ctrl dependency transformation in
 fs/nfs/delegation.c::nfs_server_return_marked_delegations()?

On Thu, Apr 14, 2022 at 02:21:25PM -0700, Nick Desaulniers wrote:
> On Thu, Apr 7, 2022 at 8:22 AM Paul Heidekrüger
> <paul.heidekrueger@...tum.de> wrote:
> >
> > Hi all,
> >
> > work on my dependency checker tool is progressing nicely, and it is
> > flagging, what I believe is, a harmful addr to ctrl dependency
> > transformation. For context, see [1] and [2]. I'm using the Clang
> > compiler.
> > [1]: https://linuxplumbersconf.org/event/7/contributions/821/attachments/598/1075/LPC_2020_--_Dependency_ordering.pdf
> > [2]: https://lore.kernel.org/llvm/YXknxGFjvaB46d%2Fp@Pauls-MacBook-Pro/T/#u
> 
> Hi Paul,
> Thanks for the report and your (and your team's) work on this tool.
> Orthogonal to your report, Jose (cc'ed) and I are currently in the
> planning process to put together a Kernel+Toolchain microconference
> track at Linux Plumbers Conference [0] this year (Sept 12-14) in
> Dublin, Ireland.  Would you or someone from your group be able and
> interested in presenting more information about your work to an
> audience of kernel and toolchain developers at such an event?

+1 on presenting at Plumbers!

							Thanx, Paul

> Would others be interested in such a topic? (What do they say in
> Starship Troopers...?...Would you like to know more?)
> 
> [0] https://lpc.events/event/16/
> -- 
> Thanks,
> ~Nick Desaulniers