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

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Date:   Tue, 18 Jun 2019 08:53:29 -0700
From:   Yu-cheng Yu <yu-cheng.yu@...el.com>
To:     Florian Weimer <fweimer@...hat.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

On Tue, 2019-06-18 at 17:49 +0200, Florian Weimer wrote:
> * 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.

Yes, Linux also looks at the main executable's header, but not its
NT_GNU_PROPERTY_TYPE_0 if there is a loader.

> 
> 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.

So from kernel, we look at only PT_GNU_PROPERTY?

Yu-cheng