linux-kernel - Re: [PATCH v9 00/16] Add support for Clang LTO

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Message-ID: <20210109160709.kqqpf64klflajarl@treble>
Date:   Sat, 9 Jan 2021 10:07:09 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Sedat Dilek <sedat.dilek@...il.com>
Cc:     Sami Tolvanen <samitolvanen@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        kernel-hardening@...ts.openwall.com, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v9 00/16] Add support for Clang LTO

On Sat, Jan 09, 2021 at 04:46:21PM +0100, Sedat Dilek wrote:
> On Sat, Jan 9, 2021 at 4:36 PM Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> >
> > On Sat, Jan 09, 2021 at 03:54:20PM +0100, Sedat Dilek wrote:
> > > I am interested in having Clang LTO (Clang-CFI) for x86-64 working and
> > > help with testing.
> > >
> > > I tried the Git tree mentioned in [3] <jpoimboe.git#objtool-vmlinux>
> > > (together with changes from <peterz.git#x86/urgent>).
> > >
> > > I only see in my build-log...
> > >
> > > drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool:
> > > eb_relocate_parse_slow()+0x3d0: stack state mismatch: cfa1=7+120
> > > cfa2=-1+0
> > > drivers/gpu/drm/i915/gem/i915_gem_execbuffer.o: warning: objtool:
> > > eb_copy_relocations()+0x229: stack state mismatch: cfa1=7+120
> > > cfa2=-1+0
> > >
> > > ...which was reported and worked on in [1].
> > >
> > > This is with Clang-IAS version 11.0.1.
> > >
> > > Unfortunately, the recent changes in <samitolvanen.github#clang-cfi>
> > > do not cleanly apply with Josh stuff.
> > > My intention/wish was to report this combination of patchsets "heals"
> > > a lot of objtool-warnings for vmlinux.o I observed with Clang-CFI.
> > >
> > > Is it possible to have a Git branch where Josh's objtool-vmlinux is
> > > working together with Clang-LTO?
> > > For testing purposes.
> >
> > I updated my branch with my most recent work from before the holidays,
> > can you try it now?  It still doesn't fix any of the crypto warnings,
> > but I'll do that in a separate set after posting these next week.
> >
> 
> Thanks, Josh.
> 
> Did you push it (oh ah push it push it really really really good...)
> to your remote Git please :-).

I thought I already pushed it pretty good ;-) do you not see it?

git://git.kernel.org/pub/scm/linux/kernel/git/jpoimboe/linux.git objtool-vmlinux

d6baee244f2d — objtool: Alphabetize usage option list (3 weeks ago)
c0b2a6a625ac — objtool: Separate vmlinux/noinstr validation config options (3 weeks ago)
84c53551ad17 — objtool: Enable full vmlinux validation (3 weeks ago)
e518ac0801cd — x86/power: Support objtool validation in hibernate_asm_64.S (3 weeks ago)
d0ac4c7301c1 — x86/power: Move restore_registers() to top of the file (3 weeks ago)
d3389bc83538 — x86/power: Convert indirect jumps to retpolines (3 weeks ago)
7a974d90aa40 — x86/acpi: Support objtool validation in wakeup_64.S (3 weeks ago)
6693e26cd6cc — x86/acpi: Convert indirect jump to retpoline (3 weeks ago)
0dfb760c74d1 — x86/ftrace: Support objtool vmlinux.o validation in ftrace_64.S (3 weeks ago)
89a4febfd7bf — x86/xen/pvh: Convert indirect jump to retpoline (3 weeks ago)
b62837092140 — x86/xen: Support objtool vmlinux.o validation in xen-head.S (3 weeks ago)
705e18481ed9 — x86/xen: Support objtool validation in xen-asm.S (3 weeks ago)
3548319e21b9 — objtool: Add xen_start_kernel() to noreturn list (3 weeks ago)
6016e8da8c3d — objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC (3 weeks ago)
56d6a7aee8b1 — objtool: Add asm version of STACK_FRAME_NON_STANDARD (3 weeks ago)
68259d951f1a — objtool: Assume only ELF functions do sibling calls (3 weeks ago)
0d6c8816cf91 — x86/ftrace: Add UNWIND_HINT_FUNC annotation for ftrace_stub (3 weeks ago)
24d6ce8cd8f6 — objtool: Support retpoline jump detection for vmlinux.o (3 weeks ago)
8145ea268f16 — objtool: Fix ".cold" section suffix check for newer versions of GCC (3 weeks ago)
b3dfca472514 — objtool: Fix retpoline detection in asm code (3 weeks ago)
b82402fa5211 — objtool: Fix error handling for STD/CLD warnings (3 weeks ago)
1f02defb4b79 — objtool: Fix seg fault in BT_FUNC() with fake jump (3 weeks ago)
2c85ebc57b3e — Linux 5.10 (4 weeks ago)

-- 
Josh