linux-kernel - [tip:x86/vdso] x86-64: Move the "user" vsyscall segment out of the data segment.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 5 Aug 2011 05:37:41 GMT
From:	tip-bot for Andy Lutomirski <luto@....edu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	luto@....edu, a.miskiewicz@...il.com, tglx@...utronix.de,
	hpa@...ux.intel.com, luto@....edu
Subject: [tip:x86/vdso] x86-64: Move the "user" vsyscall segment out of the data segment.

Commit-ID:  9c40818da5b39fca236029059ab839857b1ef56c
Gitweb:     http://git.kernel.org/tip/9c40818da5b39fca236029059ab839857b1ef56c
Author:     Andy Lutomirski <luto@....EDU>
AuthorDate: Wed, 3 Aug 2011 09:31:50 -0400
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Thu, 4 Aug 2011 16:13:35 -0700

x86-64: Move the "user" vsyscall segment out of the data segment.

The kernel's loader doesn't seem to care, but gold complains.

Signed-off-by: Andy Lutomirski <luto@....edu>
Link: http://lkml.kernel.org/r/f0716870c297242a841b949953d80c0d87bf3d3f.1312378163.git.luto@mit.edu
Reported-by: Arkadiusz Miskiewicz <a.miskiewicz@...il.com>
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/kernel/vmlinux.lds.S |   36 ++++++++++++++++++------------------
 1 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 4aa9c54..e79fb39 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -154,6 +154,24 @@ SECTIONS
 
 #ifdef CONFIG_X86_64
 
+	. = ALIGN(PAGE_SIZE);
+	__vvar_page = .;
+
+	.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
+
+	      /* Place all vvars at the offsets in asm/vvar.h. */
+#define EMIT_VVAR(name, offset) 		\
+		. = offset;		\
+		*(.vvar_ ## name)
+#define __VVAR_KERNEL_LDS
+#include <asm/vvar.h>
+#undef __VVAR_KERNEL_LDS
+#undef EMIT_VVAR
+
+	} :data
+
+       . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
+
 #define VSYSCALL_ADDR (-10*1024*1024)
 
 #define VLOAD_OFFSET (VSYSCALL_ADDR - __vsyscall_0 + LOAD_OFFSET)
@@ -162,7 +180,6 @@ SECTIONS
 #define VVIRT_OFFSET (VSYSCALL_ADDR - __vsyscall_0)
 #define VVIRT(x) (ADDR(x) - VVIRT_OFFSET)
 
-	. = ALIGN(4096);
 	__vsyscall_0 = .;
 
 	. = VSYSCALL_ADDR;
@@ -185,23 +202,6 @@ SECTIONS
 #undef VVIRT_OFFSET
 #undef VVIRT
 
-	__vvar_page = .;
-
-	.vvar : AT(ADDR(.vvar) - LOAD_OFFSET) {
-
-	      /* Place all vvars at the offsets in asm/vvar.h. */
-#define EMIT_VVAR(name, offset) 		\
-		. = offset;		\
-		*(.vvar_ ## name)
-#define __VVAR_KERNEL_LDS
-#include <asm/vvar.h>
-#undef __VVAR_KERNEL_LDS
-#undef EMIT_VVAR
-
-	} :data
-
-       . = ALIGN(__vvar_page + PAGE_SIZE, PAGE_SIZE);
-
 #endif /* CONFIG_X86_64 */
 
 	/* Init code and data - will be freed after init */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/