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[PATCH] x86/x86_64: mark rodata section read only: generic infrastructure

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Generic prep-work for marking the .rodata section readonly:
* Align the rodata section at 4Kb boundary
* call the mark_rodata_ro() function when available

Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Adrian Bunk <bunk@stusta.de>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Arjan van de Ven 2006-01-06 00:12:01 -08:00 committed by Linus Torvalds
parent d89c145c03
commit 37b73c8281
2 changed files with 9 additions and 0 deletions
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4
include/asm-generic/vmlinux.lds.h
View file

@ -10,6 +10,8 @@
#define ALIGN_FUNCTION() . = ALIGN(8)
#define RODATA \
. = ALIGN(4096); \
__start_rodata = .; \
.rodata : AT(ADDR(.rodata) - LOAD_OFFSET) { \
*(.rodata) *(.rodata.*) \
*(__vermagic) /* Kernel version magic */ \
@ -74,6 +76,8 @@
__ksymtab_strings : AT(ADDR(__ksymtab_strings) - LOAD_OFFSET) { \
*(__ksymtab_strings) \
} \
__end_rodata = .; \
. = ALIGN(4096); \
\
/* Built-in module parameters. */ \
__param : AT(ADDR(__param) - LOAD_OFFSET) { \

5
init/main.c
View file

@ -52,6 +52,7 @@
#include <asm/bugs.h>
#include <asm/setup.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
/*
* This is one of the first .c files built. Error out early
@ -99,6 +100,9 @@ extern void acpi_early_init(void);
#else
static inline void acpi_early_init(void) { }
#endif
#ifndef CONFIG_DEBUG_RODATA
static inline void mark_rodata_ro(void) { }
#endif
#ifdef CONFIG_TC
extern void tc_init(void);
@ -708,6 +712,7 @@ static int init(void * unused)
*/
free_initmem();
unlock_kernel();
mark_rodata_ro();
system_state = SYSTEM_RUNNING;
numa_default_policy();