linux-kernel - [PATCH] x86-64: fix overlap of modules and fixmap areas

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Date:	Thu, 31 Jul 2008 16:48:31 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86-64: fix overlap of modules and fixmap areas

Plus add a build time check so this doesn't go unnoticed again.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 arch/x86/kernel/head64.c     |    1 +
 include/asm-x86/pgtable_64.h |    2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

--- linux-2.6.27-rc1/arch/x86/kernel/head64.c	2008-07-31 17:31:51.000000000 +0200
+++ 2.6.27-rc1-x86_64-modules-fixmap/arch/x86/kernel/head64.c	2008-07-31 15:55:01.000000000 +0200
@@ -88,6 +88,7 @@ void __init x86_64_start_kernel(char * r
 	BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
 	BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
 				(__START_KERNEL & PGDIR_MASK)));
+	BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
 
 	/* clear bss before set_intr_gate with early_idt_handler */
 	clear_bss();
--- linux-2.6.27-rc1/include/asm-x86/pgtable_64.h	2008-07-31 17:32:19.000000000 +0200
+++ 2.6.27-rc1-x86_64-modules-fixmap/include/asm-x86/pgtable_64.h	2008-07-31 15:50:44.000000000 +0200
@@ -151,7 +151,7 @@ static inline void native_pgd_clear(pgd_
 #define VMALLOC_END      _AC(0xffffe1ffffffffff, UL)
 #define VMEMMAP_START	 _AC(0xffffe20000000000, UL)
 #define MODULES_VADDR    _AC(0xffffffffa0000000, UL)
-#define MODULES_END      _AC(0xfffffffffff00000, UL)
+#define MODULES_END      _AC(0xffffffffff000000, UL)
 #define MODULES_LEN   (MODULES_END - MODULES_VADDR)
 
 #ifndef __ASSEMBLY__



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