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From: Kees Cook <keescook@chromium.org>
To: Will Deacon <will@kernel.org>
Cc: Kees Cook <keescook@chromium.org>,
	Fangrui Song <maskray@google.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Peter Collingbourne <pcc@google.com>,
	James Morse <james.morse@arm.com>, Borislav Petkov <bp@suse.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Russell King <linux@armlinux.org.uk>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	x86@kernel.org, clang-built-linux@googlegroups.com,
	linux-arch@vger.kernel.org, linux-efi@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, linux-kernel
Subject: [PATCH v4 01/17] vmlinux.lds.h: Add .gnu.version* to DISCARDS
Date: Sun, 28 Jun 2020 23:18:24 -0700	[thread overview]
Message-ID: <20200629061840.4065483-2-keescook@chromium.org> (raw)
In-Reply-To: <20200629061840.4065483-1-keescook@chromium.org>

For vmlinux linking, no architecture uses the .gnu.version* sections,
so remove it via the common DISCARDS macro in preparation for adding
--orphan-handling=warn more widely. This is a work-around for what
appears to be a bug[1] in ld.bfd which warns for this synthetic section
even when none is found in input objects, and even when no section is
emitted for an output object[2].

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=26153
[2] https://lore.kernel.org/lkml/202006221524.CEB86E036B@keescook/

Reviewed-by: Fangrui Song <maskray@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/asm-generic/vmlinux.lds.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index db600ef218d7..1248a206be8d 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -934,6 +934,8 @@
 	*(.discard)							\
 	*(.discard.*)							\
 	*(.modinfo)							\
+	/* ld.bfd warns about .gnu.version* even when not emitted */	\
+	*(.gnu.version*)						\
 	}
 
 /**
-- 
2.25.1

WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Will Deacon <will@kernel.org>
Cc: Kees Cook <keescook@chromium.org>,
	Fangrui Song <maskray@google.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Ard Biesheuvel <ardb@kernel.org>,
	Peter Collingbourne <pcc@google.com>,
	James Morse <james.morse@arm.com>, Borislav Petkov <bp@suse.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Russell King <linux@armlinux.org.uk>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Arvind Sankar <nivedita@alum.mit.edu>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Nathan Chancellor <natechancellor@gmail.com>,
	Arnd Bergmann <arnd@arndb.de>,
	x86@kernel.org, clang-built-linux@googlegroups.com,
	linux-arch@vger.kernel.org, linux-efi@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v4 01/17] vmlinux.lds.h: Add .gnu.version* to DISCARDS
Date: Sun, 28 Jun 2020 23:18:24 -0700	[thread overview]
Message-ID: <20200629061840.4065483-2-keescook@chromium.org> (raw)
Message-ID: <20200629061824.wL3D7Fh44KR2jpjizabSDOnZSsjT79qNR5P4ST4jd_M@z> (raw)
In-Reply-To: <20200629061840.4065483-1-keescook@chromium.org>

For vmlinux linking, no architecture uses the .gnu.version* sections,
so remove it via the common DISCARDS macro in preparation for adding
--orphan-handling=warn more widely. This is a work-around for what
appears to be a bug[1] in ld.bfd which warns for this synthetic section
even when none is found in input objects, and even when no section is
emitted for an output object[2].

[1] https://sourceware.org/bugzilla/show_bug.cgi?id=26153
[2] https://lore.kernel.org/lkml/202006221524.CEB86E036B@keescook/

Reviewed-by: Fangrui Song <maskray@google.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 include/asm-generic/vmlinux.lds.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index db600ef218d7..1248a206be8d 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -934,6 +934,8 @@
 	*(.discard)							\
 	*(.discard.*)							\
 	*(.modinfo)							\
+	/* ld.bfd warns about .gnu.version* even when not emitted */	\
+	*(.gnu.version*)						\
 	}
 
 /**
-- 
2.25.1

  parent reply	other threads:[~2020-06-29  6:18 UTC|newest]

Thread overview: 70+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-29  6:18 [PATCH v4 00/17] Warn on orphan section placement Kees Cook
2020-06-29  6:18 ` Kees Cook
2020-06-29  6:18 ` Kees Cook [this message]
2020-06-29  6:18   ` [PATCH v4 01/17] vmlinux.lds.h: Add .gnu.version* to DISCARDS Kees Cook
2020-06-29  6:18 ` [PATCH v4 02/17] vmlinux.lds.h: Avoid KASAN and KCSAN's unwanted sections Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 03/17] vmlinux.lds.h: Split ELF_DETAILS from STABS_DEBUG Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 04/17] vmlinux.lds.h: Add .symtab, .strtab, and .shstrtab to ELF_DETAILS Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 05/17] ctype: Work around Clang -mbranch-protection=none bug Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  8:15   ` Ard Biesheuvel
2020-06-29  8:15     ` Ard Biesheuvel
2020-06-29 14:43     ` Kees Cook
2020-06-29 14:43       ` Kees Cook
2020-06-29 15:06     ` Kees Cook
2020-06-29 15:06       ` Kees Cook
2020-06-29 15:08       ` Ard Biesheuvel
2020-06-29 15:08         ` Ard Biesheuvel
2020-06-29 15:16         ` Kees Cook
2020-06-29 15:16           ` Kees Cook
2020-06-29 18:02       ` Nick Desaulniers
2020-06-29 18:02         ` Nick Desaulniers
2020-06-29 18:37         ` Kees Cook
2020-06-29 18:37           ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 06/17] efi/libstub: Disable -mbranch-protection Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 07/17] arm64/build: Use common DISCARDS in linker script Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 08/17] arm64/mm: Remove needless section quotes Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29 19:53   ` Nick Desaulniers
2020-06-29 19:53     ` Nick Desaulniers
2020-06-29 20:03     ` Joe Perches
2020-06-29 20:03       ` Joe Perches
2020-06-29 20:29       ` Nick Desaulniers
2020-06-29 20:29         ` Nick Desaulniers
2020-06-29 20:04     ` Kees Cook
2020-06-29 20:04       ` Kees Cook
2020-06-29 20:54       ` Arvind Sankar
2020-06-29 20:54         ` Arvind Sankar
2020-06-29 21:06         ` Arvind Sankar
2020-06-29 21:06           ` Arvind Sankar
2020-06-29  6:18 ` [PATCH v4 09/17] arm64/build: Remove .eh_frame* sections due to unwind tables Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 10/17] arm64/kernel: Remove needless Call Frame Information annotations Kees Cook
2020-06-29  6:18 ` [PATCH v4 11/17] arm64/build: Warn on orphan section placement Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 12/17] arm/build: Refactor linker script headers Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 13/17] arm/build: Explicitly keep .ARM.attributes sections Kees Cook
2020-06-29  6:18 ` [PATCH v4 14/17] arm/build: Warn on orphan section placement Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29 15:54   ` Arvind Sankar
2020-06-29 15:54     ` Arvind Sankar
2020-06-29 18:07     ` Russell King - ARM Linux admin
2020-06-29 18:07       ` Russell King - ARM Linux admin
2020-06-29 18:15       ` Arvind Sankar
2020-06-29 18:15         ` Arvind Sankar
2020-06-29 19:03         ` Russell King - ARM Linux admin
2020-06-29 19:47   ` Nick Desaulniers
2020-06-29 19:47     ` Nick Desaulniers
2020-06-29  6:18 ` [PATCH v4 15/17] arm/boot: " Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-06-29  6:18 ` [PATCH v4 16/17] x86/build: " Kees Cook
2020-06-29  6:18 ` [PATCH v4 17/17] x86/boot: " Kees Cook
2020-06-29  6:18   ` Kees Cook
2020-08-21 16:02 ` [PATCH v4 00/17] " Will Deacon
2020-08-21 17:36   ` Kees Cook

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