linux-kernel - [tip: core/build] vmlinux.lds.h: Add .gnu.version* to COMMON

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Date:   Tue, 01 Sep 2020 11:48:01 -0000
From:   "tip-bot2 for Kees Cook" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...nel.org>,
        Fangrui Song <maskray@...gle.com>, linux-arch@...r.kernel.org,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: core/build] vmlinux.lds.h: Add .gnu.version* to COMMON_DISCARDS

The following commit has been merged into the core/build branch of tip:

Commit-ID:     dfbe69689b4dee19021d8c315a5137b4790b5634
Gitweb:        https://git.kernel.org/tip/dfbe69689b4dee19021d8c315a5137b4790b5634
Author:        Kees Cook <keescook@...omium.org>
AuthorDate:    Fri, 21 Aug 2020 12:42:43 -07:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 01 Sep 2020 09:50:35 +02:00

vmlinux.lds.h: Add .gnu.version* to COMMON_DISCARDS

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/

Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Fangrui Song <maskray@...gle.com>
Cc: linux-arch@...r.kernel.org
Link: https://lore.kernel.org/r/20200821194310.3089815-3-keescook@chromium.org
---
 include/asm-generic/vmlinux.lds.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 184b23d..f1f02a2 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -957,7 +957,9 @@
 #define COMMON_DISCARDS							\
 	*(.discard)							\
 	*(.discard.*)							\
-	*(.modinfo)
+	*(.modinfo)							\
+	/* ld.bfd warns about .gnu.version* even when not emitted */	\
+	*(.gnu.version*)						\
 
 #define DISCARDS							\
 	/DISCARD/ : {							\