linux-kernel - [PATCH] [18/19] x86_64: Overlapping program headers in physical addr space fix

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Message-Id: <20061021165138.B8B5E13C4D@wotan.suse.de>
Date:	Sat, 21 Oct 2006 18:51:38 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	Vivek Goyal <vgoyal@...ibm.com>,
	Magnus Damm <magnus@...inux.co.jp>, Andi Kleen <ak@...e.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [18/19] x86_64: Overlapping program headers in physical addr space fix


From: Vivek Goyal <vgoyal@...ibm.com>

o A recent change to vmlinux.ld.S file broke kexec as now resulting vmlinux
  program headers are overlapping in physical address space.

o Now all the vsyscall related sections are placed after data and after
  that mostly init data sections are placed. To avoid physical overlap
  among phdrs, there are three possible solutions.
	- Place vsyscall sections also in data phdrs instead of user
	- move vsyscal sections after init data in bss.
	- create another phdrs say data.init and move all the sections
	  after vsyscall into this new phdr.

o This patch implements the third solution.

Signed-off-by: Vivek Goyal <vgoyal@...ibm.com>
Signed-off-by: Andi Kleen <ak@...e.de>
Cc: Magnus Damm <magnus@...inux.co.jp>
Cc: Andi Kleen <ak@...e.de>
Cc: "Eric W. Biederman" <ebiederm@...ssion.com>
Signed-off-by: Andrew Morton <akpm@...l.org>
---

 arch/x86_64/kernel/vmlinux.lds.S |    3 ++-
 1 files changed, 2 insertions(+), 1 deletion(-)

Index: linux/arch/x86_64/kernel/vmlinux.lds.S
===================================================================
--- linux.orig/arch/x86_64/kernel/vmlinux.lds.S
+++ linux/arch/x86_64/kernel/vmlinux.lds.S
@@ -17,6 +17,7 @@ PHDRS {
 	text PT_LOAD FLAGS(5);	/* R_E */
 	data PT_LOAD FLAGS(7);	/* RWE */
 	user PT_LOAD FLAGS(7);	/* RWE */
+	data.init PT_LOAD FLAGS(7);	/* RWE */
 	note PT_NOTE FLAGS(4);	/* R__ */
 }
 SECTIONS
@@ -131,7 +132,7 @@ SECTIONS
   . = ALIGN(8192);		/* init_task */
   .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) {
 	*(.data.init_task)
-  } :data
+  }:data.init
 
   . = ALIGN(4096);
   .data.page_aligned : AT(ADDR(.data.page_aligned) - LOAD_OFFSET) {
-
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