linux-kernel - [RFC PATCH 3/3] x86/vdso: Add build salt to the vDSO

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Message-Id: <20180321014635.29113-4-labbott@redhat.com>
Date:   Tue, 20 Mar 2018 18:46:35 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Andy Lutomirski <luto@...nel.org>, mjw@...oraproject.org,
        "H . J . Lu" <hjl.tools@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Laura Abbott <labbott@...hat.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        X86 ML <x86@...nel.org>, linux-kernel@...r.kernel.org,
        Nick Clifton <nickc@...hat.com>,
        Cary Coutant <ccoutant@...il.com>
Subject: [RFC PATCH 3/3] x86/vdso: Add build salt to the vDSO


The vDSO is linked separately from the kernel and modules. Ensure it picks
up the comment section, if available.

Signed-off-by: Laura Abbott <labbott@...hat.com>
---
I only added x86 in this series because that's my primary interest.
Other arches could easily follow suit if they care.
---
 arch/x86/entry/vdso/vdso-layout.lds.S | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S
index acfd5ba7d943..ab72f3c87ebb 100644
--- a/arch/x86/entry/vdso/vdso-layout.lds.S
+++ b/arch/x86/entry/vdso/vdso-layout.lds.S
@@ -1,5 +1,6 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 #include <asm/vdso.h>
+#include <generated/build-salt.h>
 
 /*
  * Linker script for vDSO.  This is an ELF shared object prelinked to
@@ -95,6 +96,8 @@ SECTIONS
 	.altinstructions	: { *(.altinstructions) }	:text
 	.altinstr_replacement	: { *(.altinstr_replacement) }	:text
 
+	ID_TAG
+
 	/DISCARD/ : {
 		*(.discard)
 		*(.discard.*)
-- 
2.16.2