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authorArjan van de Ven <arjan@infradead.org>2006-01-06 00:12:04 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:36 -0800
commit67df197b1a07944c2e0e40ded3d4fd07d108e110 (patch)
treeb29534a27b2c18e64c6b3d4cdc149de8978e38ba /arch/x86_64/mm
parentc728252c7a072628bd3932ff87943d1e12423359 (diff)
[PATCH] x86/x86_64: mark rodata section read-only: x86-64 support
x86-64 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> 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/x86_64/mm')
-rw-r--r--arch/x86_64/mm/init.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index c016dfe8478..1faae5fc1c0 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -498,6 +498,29 @@ void free_initmem(void)
printk ("Freeing unused kernel memory: %luk freed\n", (__init_end - __init_begin) >> 10);
}
+#ifdef CONFIG_DEBUG_RODATA
+
+extern char __start_rodata, __end_rodata;
+void mark_rodata_ro(void)
+{
+ unsigned long addr = (unsigned long)&__start_rodata;
+
+ for (; addr < (unsigned long)&__end_rodata; addr += PAGE_SIZE)
+ change_page_attr_addr(addr, 1, PAGE_KERNEL_RO);
+
+ printk ("Write protecting the kernel read-only data: %luk\n",
+ (&__end_rodata - &__start_rodata) >> 10);
+
+ /*
+ * change_page_attr_addr() requires a global_flush_tlb() call after it.
+ * We do this after the printk so that if something went wrong in the
+ * change, the printk gets out at least to give a better debug hint
+ * of who is the culprit.
+ */
+ global_flush_tlb();
+}
+#endif
+
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{