From: Nathan Chancellor <nathan@kernel.org>
To: Josh Poimboeuf <jpoimboe@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, llvm@lists.linux.dev
Subject: objtool "'naked' return found in RETHUNK build" with clang + CONFIG_K{A,C}SAN=y
Date: Wed, 13 Jul 2022 08:47:58 -0700 [thread overview]
Message-ID: <Ys7pLq+tQk5xEa/B@dev-arch.thelio-3990X> (raw)
Hi Josh and Peter,
After commit 9bb2ec608a20 ("objtool: Update Retpoline validation") and
commit f43b9876e857 ("x86/retbleed: Add fine grained Kconfig knobs"), I
see a spew of objtool warnings when building certain configurations with
clang. Examples below, they appear to trigger in every single file.
With x86_64_defconfig + CONFIG_KASAN=y:
arch/x86/ia32/audit.o: warning: objtool: asan.module_ctor+0x11: 'naked' return found in RETHUNK build
arch/x86/ia32/audit.o: warning: objtool: asan.module_dtor+0x11: 'naked' return found in RETHUNK build
init/version.o: warning: objtool: asan.module_ctor+0x11: 'naked' return found in RETHUNK build
init/version.o: warning: objtool: asan.module_dtor+0x11: 'naked' return found in RETHUNK build
arch/x86/kernel/cpu/rdrand.o: warning: objtool: asan.module_ctor+0x11: 'naked' return found in RETHUNK build
arch/x86/kernel/cpu/rdrand.o: warning: objtool: asan.module_dtor+0x11: 'naked' return found in RETHUNK build
arch/x86/kernel/fpu/bugs.o: warning: objtool: asan.module_ctor+0x11: 'naked' return found in RETHUNK build
arch/x86/kernel/fpu/bugs.o: warning: objtool: asan.module_dtor+0x11: 'naked' return found in RETHUNK build
arch/x86/kernel/platform-quirks.o: warning: objtool: asan.module_ctor+0x0: 'naked' return found in RETHUNK build
init/calibrate.o: warning: objtool: asan.module_ctor+0x11: 'naked' return found in RETHUNK build
init/calibrate.o: warning: objtool: asan.module_dtor+0x11: 'naked' return found in RETHUNK build
With x86_64_defconfig + CONFIG_KCSAN=y:
arch/x86/ia32/audit.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
init/calibrate.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
init/version.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
arch/x86/kernel/fpu/bugs.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
arch/x86/kernel/cpu/rdrand.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
arch/x86/events/probe.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
arch/x86/kernel/apic/ipi.o: warning: objtool: tsan.module_ctor+0x5: 'naked' return found in RETHUNK build
If there is any additional information I can provide or patches I can
test, I am happy to do so!
Cheers,
Nathan
next reply other threads:[~2022-07-13 15:48 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-13 15:47 Nathan Chancellor [this message]
2022-07-13 16:01 ` objtool "'naked' return found in RETHUNK build" with clang + CONFIG_K{A,C}SAN=y Nick Desaulniers
2022-07-13 16:13 ` Nathan Chancellor
2022-07-13 16:25 ` Peter Zijlstra
2022-07-13 16:42 ` Nick Desaulniers
2022-07-13 22:05 ` Nick Desaulniers
2022-07-14 0:31 ` Nick Desaulniers
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