linux-kernel - Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING e6eb15c9ba3165698488ae5c34920eea20eaa38e

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Message-ID: <20200916083032.GL2674@hirez.programming.kicks-ass.net>
Date:   Wed, 16 Sep 2020 10:30:32 +0200
From:   peterz@...radead.org
To:     Marco Elver <elver@...gle.com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Rong Chen <rong.a.chen@...el.com>,
        kernel test robot <lkp@...el.com>,
        "Li, Philip" <philip.li@...el.com>, x86-ml <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        kasan-dev <kasan-dev@...glegroups.com>
Subject: Re: [tip:x86/seves] BUILD SUCCESS WITH WARNING
 e6eb15c9ba3165698488ae5c34920eea20eaa38e

On Tue, Sep 15, 2020 at 08:09:16PM +0200, Marco Elver wrote:
> On Tue, 15 Sep 2020 at 19:40, Nick Desaulniers <ndesaulniers@...gle.com> wrote:
> > On Tue, Sep 15, 2020 at 10:21 AM Borislav Petkov <bp@...en8.de> wrote:

> > > init/calibrate.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
> > > init/calibrate.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup
> > > init/version.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
> > > init/version.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup
> > > certs/system_keyring.o: warning: objtool: asan.module_ctor()+0xc: call without frame pointer save/setup
> > > certs/system_keyring.o: warning: objtool: asan.module_dtor()+0xc: call without frame pointer save/setup
> 
> This one also appears with Clang 11. This is new I think because we
> started emitting ASAN ctors for globals redzone initialization.
> 
> I think we really do not care about precise stack frames in these
> compiler-generated functions. So, would it be reasonable to make
> objtool ignore all *san.module_ctor and *san.module_dtor functions (we
> have them for ASAN, TSAN, MSAN)?

The thing is, if objtool cannot follow, it cannot generate ORC data and
our unwinder cannot unwind through the instrumentation, and that is a
fail.

Or am I missing something here?