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[S390] Mark kernel text section read-only.

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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>
This commit is contained in:
Heiko Carstens
2007-02-05 21:18:41 +01:00
committed by Martin Schwidefsky
parent ab14de6c37
commit 162e006ef5
5 changed files with 32 additions and 12 deletions
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9
arch/s390/mm/init.c
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@@ -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 @@ static void __init setup_ro_region(void)
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 @@ void __init mem_init(void)
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)