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

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Message-ID: <87pnna7v1d.fsf@oldenburg2.str.redhat.com>
Date:   Tue, 18 Jun 2019 17:49:50 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>
Cc:     Dave Martin <Dave.Martin@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>, 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

* Yu-cheng Yu:

> The kernel looks at only ld-linux.  Other applications are loaded by ld-linux. 
> So the issues are limited to three versions of ld-linux's.  Can we somehow
> update those??

I assumed that it would also parse the main executable and make
adjustments based on that.

ld.so can certainly provide whatever the kernel needs.  We need to tweak
the existing loader anyway.

No valid statically-linked binaries exist today, so this is not a
consideration at this point.

Thanks,
Florian