linux-kernel - Re: [PATCH v3 00/12] signal: sort out si_trapno and si

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Message-ID: <CANpmjNM5sYihM_9P5YHx06BooqLDhK96cMHGKaf61nCcoDJBdw@mail.gmail.com>
Date:   Wed, 5 May 2021 00:05:00 +0200
From:   Marco Elver <elver@...gle.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Florian Weimer <fweimer@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Collingbourne <pcc@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        sparclinux <sparclinux@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [PATCH v3 00/12] signal: sort out si_trapno and si_perf

On Tue, 4 May 2021 at 23:13, Eric W. Biederman <ebiederm@...ssion.com> wrote:
>
> This set of changes sorts out the ABI issues with SIGTRAP TRAP_PERF, and
> hopefully will can get merged before any userspace code starts using the
> new ABI.
>
> The big ideas are:
> - Placing the asserts first to prevent unexpected ABI changes
> - si_trapno becomming ordinary fault subfield.
> - struct signalfd_siginfo is almost full
>
> This set of changes starts out with Marco's static_assert changes and
> additional one of my own that enforces the fact that the alignment of
> siginfo_t is also part of the ABI.  Together these build time
> checks verify there are no unexpected ABI changes in the changes
> that follow.
>
> The field si_trapno is changed to become an ordinary extension of the
> _sigfault member of siginfo.
>
> The code is refactored a bit and then si_perf_type is added along side
> si_perf_data in the _perf subfield of _sigfault of siginfo_t.
>
> Finally the signalfd_siginfo fields are removed as they appear to be
> filling up the structure without userspace actually being able to use
> them.
>
> v2: https://lkml.kernel.org/r/m14kfjh8et.fsf_-_@fess.ebiederm.org
> v1: https://lkml.kernel.org/r/m1zgxfs7zq.fsf_-_@fess.ebiederm.org
>
> Eric W. Biederman (9):
>       signal: Verify the alignment and size of siginfo_t
>       siginfo: Move si_trapno inside the union inside _si_fault
>       signal: Implement SIL_FAULT_TRAPNO
>       signal: Use dedicated helpers to send signals with si_trapno set
>       signal: Remove __ARCH_SI_TRAPNO
>       signal: Rename SIL_PERF_EVENT SIL_FAULT_PERF_EVENT for consistency
>       signal: Factor force_sig_perf out of perf_sigtrap
>       signal: Deliver all of the siginfo perf data in _perf
>       signalfd: Remove SIL_FAULT_PERF_EVENT fields from signalfd_siginfo
>
> Marco Elver (3):
>       sparc64: Add compile-time asserts for siginfo_t offsets
>       arm: Add compile-time asserts for siginfo_t offsets
>       arm64: Add compile-time asserts for siginfo_t offsets

I can't seem to see the rest of them in my inbox. LKML also is missing
them: https://lore.kernel.org/linux-api/m1tuni8ano.fsf_-_@fess.ebiederm.org/

Something must have swallowed them. Could you resend?
I'll then test in the morning.

Thanks,
-- Marco