linux-kernel - [PATCH 6/8] x86: mark some standard sections as broken in a vDSO

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Date:	Fri, 12 Jun 2009 15:25:40 +0200
From:	Petr Tesarik <ptesarik@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>,
	Petr Tesarik <ptesarik@...e.cz>
Subject: [PATCH 6/8] x86: mark some standard sections as broken in a vDSO

Some standard sections can't work in a vDSO. Although most of them
are not very likely to ever appear there, it doesn't hurt to list
them as a precaution.

Signed-off-by: Petr Tesarik <ptesarik@...e.cz>
---
 arch/x86/vdso/vdso-layout.lds.S |   19 +++++++++++++++++++
 1 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/arch/x86/vdso/vdso-layout.lds.S b/arch/x86/vdso/vdso-layout.lds.S
index 2f0830f..0da3db0 100644
--- a/arch/x86/vdso/vdso-layout.lds.S
+++ b/arch/x86/vdso/vdso-layout.lds.S
@@ -71,6 +71,25 @@ SECTIONS
 	 * if they get used by accident.
 	 */
 	.broken : {
+		/* Code in the Procedure Linkage Table will segfault */
+		*(.plt)
+
+		/* Relocation will not be done, so any pointers will
+		 * still point to the prelinked address, which is wrong
+		 */
+		*(.data.rel.ro*)
+		*(.gnu.linkonce.d.rel.ro.*)
+
+		/* Initialization/termination won't work this way */
+		*(.init) *(.fini)
+		*(.preinit_array) *(.init_array*)
+		*(.fini_array*)
+
+		/* Thread-local storage cannot be defined like this */
+		*(.tdata .tdata.* .gnu.linkonce.td.*)
+		*(.tbss .tbss.* .gnu.linkonce.tb.*)
+		*(.tcommon)
+
 		/* The vDSO setup code does not handle alternative
 		 * instructions.
 		 */ 
-- 
1.6.0.2

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