linux-kernel - Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file

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Message-ID: <20190618125512.GJ3419@hirez.programming.kicks-ass.net>
Date:   Tue, 18 Jun 2019 14:55:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Florian Weimer <fweimer@...hat.com>
Cc:     Dave Martin <Dave.Martin@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu-cheng Yu <yu-cheng.yu@...el.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-api@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Andy Lutomirski <luto@...capital.net>,
        Balbir Singh <bsingharora@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omium.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>
Subject: Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an
 ELF file

On Tue, Jun 18, 2019 at 02:47:00PM +0200, Florian Weimer wrote:
> * Peter Zijlstra:
> 
> > I'm not sure I read Thomas' comment like that. In my reading keeping the
> > PT_NOTE fallback is exactly one of those 'fly workarounds'. By not
> > supporting PT_NOTE only the 'fine' people already shit^Hpping this out
> > of tree are affected, and we don't have to care about them at all.
> 
> Just to be clear here: There was an ABI document that required PT_NOTE
> parsing.

URGH.

> The Linux kernel does *not* define the x86-64 ABI, it only
> implements it.  The authoritative source should be the ABI document.
>
> In this particularly case, so far anyone implementing this ABI extension
> tried to provide value by changing it, sometimes successfully.  Which
> makes me wonder why we even bother to mainatain ABI documentation.  The
> kernel is just very late to the party.

How can the kernel be late to the party if all of this is spinning
wheels without kernel support?