linux-kernel - [PATCH AUTOSEL 4.18 25/27] vmlinux.lds.h: Fix linker warnings about orphan .LPBX sections

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20181022101924.40531-25-sashal@kernel.org>
Date:   Mon, 22 Oct 2018 06:19:22 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.18 25/27] vmlinux.lds.h: Fix linker warnings about orphan .LPBX sections

From: Peter Oberparleiter <oberpar@...ux.ibm.com>

[ Upstream commit 52c8ee5bad8f33d02c567f6609f43d69303fc48d ]

Enabling both CONFIG_LD_DEAD_CODE_DATA_ELIMINATION=y and
CONFIG_GCOV_PROFILE_ALL=y results in linker warnings:

  warning: orphan section `.data..LPBX1' being placed in
  section `.data..LPBX1'.

LD_DEAD_CODE_DATA_ELIMINATION adds compiler flag -fdata-sections. This
option causes GCC to create separate data sections for data objects,
including those generated by GCC internally for gcov profiling. The
names of these objects start with a dot (.LPBX0, .LPBX1), resulting in
section names starting with 'data..'.

As section names starting with 'data..' are used for specific purposes
in the Linux kernel, the linker script does not automatically include
them in the output data section, resulting in the "orphan section"
linker warnings.

Fix this by specifically including sections named "data..LPBX*" in the
data section.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Tested-by: Stephen Rothwell <sfr@...b.auug.org.au>
Tested-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/asm-generic/vmlinux.lds.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index a11f86014352..83b930988e21 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -70,7 +70,7 @@
  */
 #ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
 #define TEXT_MAIN .text .text.[0-9a-zA-Z_]*
-#define DATA_MAIN .data .data.[0-9a-zA-Z_]*
+#define DATA_MAIN .data .data.[0-9a-zA-Z_]* .data..LPBX*
 #define SDATA_MAIN .sdata .sdata.[0-9a-zA-Z_]*
 #define RODATA_MAIN .rodata .rodata.[0-9a-zA-Z_]*
 #define BSS_MAIN .bss .bss.[0-9a-zA-Z_]*
-- 
2.17.1