From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-vs1-f41.google.com (mail-vs1-f41.google.com [209.85.217.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C0C1F1FD5 for ; Thu, 22 Sep 2022 04:43:10 +0000 (UTC) Received: by mail-vs1-f41.google.com with SMTP id m65so9067412vsc.1 for ; Wed, 21 Sep 2022 21:43:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:from:to:cc:subject:date; bh=8AflOqN04vc1545ZT30cUB8nlUPhJIkpf3YTn/VTSBY=; b=TFzz9E1AahsR8h2vsNBDe2z0SMAj5WfJ6EwqAXS1AdkND7xdCzDBHRNRczIpzzw0Qr Fqvzh7MyFmDIDYNcS0uRKRnhRoHrNNhfdRk+qebLYw2BAAgh6Z2gWGay2tqXCAdUeLTc feoMrPJyzVkqYBLXLdWY9XPXc0SFEOdMqimSwFC4+smzJ2NhyruYdt2l3S7mFgPyGAoQ 7u/SJpsMWN9JPAAc//MZJOsjA8KWIHSVzh5dcO9xc/1L5uIks+AgYZ03Qwl5nGlrgOGJ pB54RNlIn0pwIuN68Y5Cs2D+7gH0P8qX22I6qwHpASJCxXqju0QJMRa861chBeZn+to+ OJcw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:subject:message-id:date:from:in-reply-to:references :mime-version:x-gm-message-state:from:to:cc:subject:date; bh=8AflOqN04vc1545ZT30cUB8nlUPhJIkpf3YTn/VTSBY=; b=XQeTfVYH5kJddy0g+Pv65UeRJu1S9mhShH6ywPJqTbPrkOyZFQdUDiNQ23lG+/IROb L3+eQOmh87doXG6cNaosgKUmvtMKJ9Z/DRE6A+Hx7CfEcQiBkS4nk+Etb6FXfy8YmwIm NEAHf1fjJkjH5M/i6zG/R0SKqS8g99wE49fimeqpblDLRM1Fc0fcSguvTJyAIs79e/6Q fzLHnKlUrQe2xj3WUvLqLRWz7HJZhWshfftN1CtFb4OwfPyj/LeIAt7wUsYjKjBrEupG BaILRdMGsEudHWyKoWzFNq04IJyh4pLdqGapq5NapNbHe+VVoIk5RftYlc/Bl+cKK6+y YDeQ== X-Gm-Message-State: ACrzQf1gARnrxgXbI7zfgza2nogb0gm4/9xH3/70PJYco4jvhG+gyYhy HquS3ddK83trUuoGQ9TSZMjSZNodru6kKIMwVtc8aA== X-Google-Smtp-Source: AMsMyM5kLyaz1U/FO5bZl9wkYv0DGr9Bypgpz/3fk6hoX4sYGz7WbcY39imzvESsweGye7WRkfcatjaOmHauOPT1WfY= X-Received: by 2002:a67:fb8a:0:b0:398:9d72:bddf with SMTP id n10-20020a67fb8a000000b003989d72bddfmr561911vsr.38.1663821789458; Wed, 21 Sep 2022 21:43:09 -0700 (PDT) Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 References: <20220921064855.2841607-1-davidgow@google.com> In-Reply-To: From: David Gow Date: Thu, 22 Sep 2022 12:42:58 +0800 Message-ID: Subject: Re: [PATCH v2] arch: um: Mark the stack non-executable to fix a binutils warning To: Nick Desaulniers Cc: Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Dave Hansen , Linus Torvalds , Brendan Higgins , Daniel Latypov , linux-um , Linux Kernel Mailing List , KUnit Development , x86@kernel.org, Lukas Straub , Randy Dunlap , clang-built-linux Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="000000000000c025ea05e93cb2f0" --000000000000c025ea05e93cb2f0 Content-Type: text/plain; charset="UTF-8" On Thu, Sep 22, 2022 at 1:47 AM 'Nick Desaulniers' via KUnit Development wrote: > > On Tue, Sep 20, 2022 at 11:49 PM David Gow wrote: > > > > Since binutils 2.39, ld will print a warning if any stack section is > > executable, which is the default for stack sections on files without a > > .note.GNU-stack section. > > > > This was fixed for x86 in commit ffcf9c5700e4 ("x86: link vdso and boot with -z noexecstack --no-warn-rwx-segments"), > > but remained broken for UML, resulting in several warnings: > > > > /usr/bin/ld: warning: arch/x86/um/vdso/vdso.o: missing .note.GNU-stack section implies executable stack > > /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker > > /usr/bin/ld: warning: .tmp_vmlinux.kallsyms1 has a LOAD segment with RWX permissions > > /usr/bin/ld: warning: .tmp_vmlinux.kallsyms1.o: missing .note.GNU-stack section implies executable stack > > /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker > > /usr/bin/ld: warning: .tmp_vmlinux.kallsyms2 has a LOAD segment with RWX permissions > > /usr/bin/ld: warning: .tmp_vmlinux.kallsyms2.o: missing .note.GNU-stack section implies executable stack > > /usr/bin/ld: NOTE: This behaviour is deprecated and will be removed in a future version of the linker > > /usr/bin/ld: warning: vmlinux has a LOAD segment with RWX permissions > > > > Link both the VDSO and vmlinux with -z noexecstack, fixing the warnings > > about .note.GNU-stack sections. In addition, pass --no-warn-rwx-segments > > to dodge the remaining warnings about LOAD segments with RWX permissions > > in the kallsyms objects. (Note that this flag is apparently not > > available on lld, so hide it behind a test for BFD, which is what the > > x86 patch does.) > > > > Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ffcf9c5700e49c0aee42dcba9a12ba21338e8136 > > Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=ba951afb99912da01a6e8434126b8fac7aa75107 > > Signed-off-by: David Gow > > Reviewed-by: Lukas Straub > > Tested-by: Lukas Straub > > Acked-by: Randy Dunlap # build-tested > > --- > > > > Note that this still doesn't seem to be working properly with make > > LLVM=1. It doesn't appear to break anything, and still is an improvement > > for gcc, so seems worthwhile anyway... > > Hi David, > Do you have more info about this comment? Perhaps there's more > hermiticity issues with ARCH=um when a linker is explicitly specified > via LD= or HOSTLD=, or implied via LLVM=1. > > Looking at our CI for ARCH=um builds... > https://github.com/ClangBuiltLinux/continuous-integration2/actions/runs/3095779516/jobs/5012260390 > warnings from /usr/bin/ld. That's...unexpected. > I've filed https://github.com/ClangBuiltLinux/linux/issues/1715 to > follow up on this. > Thanks for following up on this. Yeah: what I'm seeing seems to match it does look like ld is being used instead of lld. I tried -fuse-ld=lld via the following patch, though, and got a whole bunch of "error: relocation R_X86_64_64 cannot be used against local symbol; recompile with -fPIC" errors, so I think there's probably more issues with UML and LLD that need working out. (I had no luck with CONFIG_STATIC_LINK=y, nor with an attempt to use $(LD) directly, instead of via $(CC)). --- diff --git a/arch/um/Makefile b/arch/um/Makefile index f1d4d67157be..01d9eae736be 100644 --- a/arch/um/Makefile +++ b/arch/um/Makefile @@ -139,6 +139,9 @@ ifeq ($(CONFIG_LD_IS_BFD),y) LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) endif +# Since we're using CC as the driver, we need to force LLD if it is requested. +LINK-$(CONFIG_LD_IS_LLD) += $(call cc-option,--ld-path=$(LD),-fuse-ld=lld) + LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt)) # Used by link-vmlinux.sh which has special support for um link --- I'll update the GitHub issue with these notes as well, but I definitely think it'd be best not to make UML use lld here until it actually builds something: even with the warnings, ld is at least latting us run at all. Cheers, -- David > > > > Changes since v1: > > http://lists.infradead.org/pipermail/linux-um/2022-August/004234.html > > - Pass the -z noexecstack and --no-warn-rwx-segments flags as LDFLAGS, > > rather than as CFLAGS via -Wl > > - Check that --no-warn-rwx-segments exists with the ld-option function > > (Thanks Richard) > > - Add Lukas and Randy's tags. > > > > > > arch/um/Makefile | 8 ++++++++ > > arch/x86/um/vdso/Makefile | 2 +- > > 2 files changed, 9 insertions(+), 1 deletion(-) > > > > diff --git a/arch/um/Makefile b/arch/um/Makefile > > index f2fe63bfd819..f1d4d67157be 100644 > > --- a/arch/um/Makefile > > +++ b/arch/um/Makefile > > @@ -132,10 +132,18 @@ export LDS_ELF_FORMAT := $(ELF_FORMAT) > > # The wrappers will select whether using "malloc" or the kernel allocator. > > LINK_WRAPS = -Wl,--wrap,malloc -Wl,--wrap,free -Wl,--wrap,calloc > > > > +# Avoid binutils 2.39+ warnings by marking the stack non-executable and > > +# ignorning warnings for the kallsyms sections. > > +LDFLAGS_EXECSTACK = -z noexecstack > > +ifeq ($(CONFIG_LD_IS_BFD),y) > > +LDFLAGS_EXECSTACK += $(call ld-option,--no-warn-rwx-segments) > > +endif > > + > > LD_FLAGS_CMDLINE = $(foreach opt,$(KBUILD_LDFLAGS),-Wl,$(opt)) > > > > # Used by link-vmlinux.sh which has special support for um link > > export CFLAGS_vmlinux := $(LINK-y) $(LINK_WRAPS) $(LD_FLAGS_CMDLINE) > > +export LDFLAGS_vmlinux := $(LDFLAGS_EXECSTACK) > > > > # When cleaning we don't include .config, so we don't include > > # TT or skas makefiles and don't clean skas_ptregs.h. > > diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile > > index 8c0396fd0e6f..6fbe97c52c99 100644 > > --- a/arch/x86/um/vdso/Makefile > > +++ b/arch/x86/um/vdso/Makefile > > @@ -65,7 +65,7 @@ quiet_cmd_vdso = VDSO $@ > > -Wl,-T,$(filter %.lds,$^) $(filter %.o,$^) && \ > > sh $(srctree)/$(src)/checkundef.sh '$(NM)' '$@' > > > > -VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv > > +VDSO_LDFLAGS = -fPIC -shared -Wl,--hash-style=sysv -z noexecstack > > GCOV_PROFILE := n > > > > # > > -- > > 2.37.3.968.ga6b4b080e4-goog > > > > > -- > Thanks, > ~Nick Desaulniers > > -- > You received this message because you are subscribed to the Google Groups "KUnit Development" group. > To unsubscribe from this group and stop receiving emails from it, send an email to kunit-dev+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/kunit-dev/CAKwvOdnLaDn%3DEfGFhjhcZe4EzvjU7Cws3z3KjLGwW%3DxnqnmHyw%40mail.gmail.com. --000000000000c025ea05e93cb2f0 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIPnwYJKoZIhvcNAQcCoIIPkDCCD4wCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg ggz5MIIEtjCCA56gAwIBAgIQeAMYYHb81ngUVR0WyMTzqzANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE 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