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authorArjan van de Ven <arjan@infradead.org>2006-01-06 03:12:02 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 11:33:36 -0500
commit63aaf3086baea7b94c218053af8237f9dbac5d05 (patch)
treedc32bf8878d01a25a321eb6412f27bce7ec7c5b7 /arch/i386/mm/init.c
parent37b73c828185731f6236a6387c02d7b08c150810 (diff)
[PATCH] x86/x86_64: mark rodata section read only: x86 parts
x86 specific parts to make the .rodata section read only 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: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/mm/init.c')
-rw-r--r--arch/i386/mm/init.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/arch/i386/mm/init.c b/arch/i386/mm/init.c
index 06e26f006238..7df494b51a5b 100644
--- a/arch/i386/mm/init.c
+++ b/arch/i386/mm/init.c
@@ -735,6 +735,30 @@ void free_initmem(void)
735 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (__init_end - __init_begin) >> 10); 735 printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", (__init_end - __init_begin) >> 10);
736} 736}
737 737
738#ifdef CONFIG_DEBUG_RODATA
739
740extern char __start_rodata, __end_rodata;
741void mark_rodata_ro(void)
742{
743 unsigned long addr = (unsigned long)&__start_rodata;
744
745 for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
746 change_page_attr(virt_to_page(addr), 1, PAGE_KERNEL_RO);
747
748 printk ("Write protecting the kernel read-only data: %luk\n",
749 (unsigned long)(&__end_rodata - &__start_rodata) >> 10);
750
751 /*
752 * change_page_attr() requires a global_flush_tlb() call after it.
753 * We do this after the printk so that if something went wrong in the
754 * change, the printk gets out at least to give a better debug hint
755 * of who is the culprit.
756 */
757 global_flush_tlb();
758}
759#endif
760
761
738#ifdef CONFIG_BLK_DEV_INITRD 762#ifdef CONFIG_BLK_DEV_INITRD
739void free_initrd_mem(unsigned long start, unsigned long end) 763void free_initrd_mem(unsigned long start, unsigned long end)
740{ 764{