[S390] Mark kernel text section read-only.
Set read-only flag in the page table entries for the kernel image text
section. This will catch all instruction caused corruptions withing the
text section.
Instruction replacement via kprobes still works, since it bypasses now
dynamic address translation.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c
index 162a338..b3e7c45 100644
--- a/arch/s390/mm/init.c
+++ b/arch/s390/mm/init.c
@@ -26,7 +26,6 @@
#include <linux/pfn.h>
#include <linux/poison.h>
#include <linux/initrd.h>
-
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -96,8 +95,8 @@
pte_t new_pte;
unsigned long address, end;
- address = ((unsigned long)&__start_rodata) & PAGE_MASK;
- end = PFN_ALIGN((unsigned long)&__end_rodata);
+ address = ((unsigned long)&_stext) & PAGE_MASK;
+ end = PFN_ALIGN((unsigned long)&_eshared);
for (; address < end; address += PAGE_SIZE) {
pgd = pgd_offset_k(address);
@@ -173,8 +172,8 @@
datasize >>10,
initsize >> 10);
printk("Write protected kernel read-only data: %#lx - %#lx\n",
- (unsigned long)&__start_rodata,
- PFN_ALIGN((unsigned long)&__end_rodata) - 1);
+ (unsigned long)&_stext,
+ PFN_ALIGN((unsigned long)&_eshared) - 1);
}
void free_initmem(void)