linux-kernel - [PATCH v3 5/9] x86: mark some standard sections as broken in a vDSO

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Message-Id: <1245156929-30395-6-git-send-email-ptesarik@suse.cz>
Date:	Tue, 16 Jun 2009 14:55:25 +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 v3 5/9] 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 |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/x86/vdso/vdso-layout.lds.S b/arch/x86/vdso/vdso-layout.lds.S
index 3d34d66..74fc5ae 100644
--- a/arch/x86/vdso/vdso-layout.lds.S
+++ b/arch/x86/vdso/vdso-layout.lds.S
@@ -76,6 +76,31 @@ SECTIONS
 	 */
 	.broken : {
 		/*
+		 * Code in the Procedure Linkage Table will segfault.
+		 */
+		*(.plt)
+
+		/*
+		 * Nobody does the final relocation to fixup prelinked
+		 * addresses for the actual vDSO base address.
+		 */
+		*(.rel*)
+
+		/*
+		 * 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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