linux-kernel - Re: [RFC PATCH v2 20/27] x86/cet/shstk: ELF header parsing of CET

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Message-ID: <10c224e9-933a-20d8-a286-5065a6cb10f1@redhat.com>
Date:   Wed, 11 Jul 2018 13:12:57 +0200
From:   Florian Weimer <fweimer@...hat.com>
To:     Yu-cheng Yu <yu-cheng.yu@...el.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        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>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H.J. Lu" <hjl.tools@...il.com>, Jann Horn <jannh@...gle.com>,
        Jonathan Corbet <corbet@....net>,
        Kees Cook <keescook@...omiun.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Oleg Nesterov <oleg@...hat.com>, Pavel Machek <pavel@....cz>,
        Peter Zijlstra <peterz@...radead.org>,
        "Ravi V. Shankar" <ravi.v.shankar@...el.com>,
        Vedvyas Shanbhogue <vedvyas.shanbhogue@...el.com>
Subject: Re: [RFC PATCH v2 20/27] x86/cet/shstk: ELF header parsing of CET

On 07/11/2018 12:26 AM, Yu-cheng Yu wrote:
> +	/*
> +	 * PT_NOTE segment is small.  Read at most
> +	 * PAGE_SIZE.
> +	 */
> +	if (note_size > PAGE_SIZE)
> +		note_size = PAGE_SIZE;

That's not really true.  There are some huge PT_NOTE segments out there.

Why can't you check the notes after the executable has been mapped?

Thanks,
Florian