linux-kernel - Re: [RFC 37/37] fs/binfmt_elf: Block old shstk elf bit

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Message-ID: <87iljs4ecp.fsf@oldenburg.str.redhat.com>
Date:   Sun, 06 Nov 2022 10:33:10 +0100
From:   Florian Weimer <fweimer@...hat.com>
To:     "H.J. Lu" <hjl.tools@...il.com>
Cc:     Rick Edgecombe <rick.p.edgecombe@...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@...nel.org>,
        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>,
        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>,
        Peter Zijlstra <peterz@...radead.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        Weijiang Yang <weijiang.yang@...el.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        John Allen <john.allen@....com>, kcc@...gle.com,
        eranian@...gle.com, rppt@...nel.org, jamorris@...ux.microsoft.com,
        dethoma@...rosoft.com, akpm@...ux-foundation.org,
        Yu-cheng Yu <yu-cheng.yu@...el.com>
Subject: Re: [RFC 37/37] fs/binfmt_elf: Block old shstk elf bit

* H. J. Lu:

> This change doesn't make a binary CET compatible.  It just requires
> that the toolchain must be updated and all binaries have to be
> recompiled with the new toolchain to enable CET.  It doesn't solve any
> issue which can't be solved by not updating glibc.

Right, and it doesn't even address the library case (the kernel would
have to hook into mmap for that).  The kernel shouldn't do this.

Thanks,
Florian