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

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Date:	Fri, 6 Oct 2006 16:35:00 -0400
From:	Vivek Goyal <vgoyal@...ibm.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@....de>
Cc:	Fastboot mailing list <fastboot@...ts.osdl.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Magnus Damm <magnus@...inux.co.jp>, Ian.Campbell@...Source.com
Subject: [PATCH] x86_64: Overlapping program headers in physical addr space fix

Hi Andi,

Can you please apply following patch. Magnus verified that it fixed
his problem.

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>
---

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

diff -puN arch/x86_64/kernel/vmlinux.lds.S~x86_64-physical-addr-space-overlap-in-phdrs-fix arch/x86_64/kernel/vmlinux.lds.S
--- linux-2.6.19-rc1-1M/arch/x86_64/kernel/vmlinux.lds.S~x86_64-physical-addr-space-overlap-in-phdrs-fix	2006-10-05 12:15:00.000000000 -0400
+++ linux-2.6.19-rc1-1M-root/arch/x86_64/kernel/vmlinux.lds.S	2006-10-05 12:15:00.000000000 -0400
@@ -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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