On 03/08/2016 01:41 AM, Kees Cook wrote:
>> --- a/arch/s390/kernel/vmlinux.lds.S
>> +++ b/arch/s390/kernel/vmlinux.lds.S
>> @@ -52,6 +52,12 @@ SECTIONS
>>
>> RW_DATA_SECTION(0x100, PAGE_SIZE, THREAD_SIZE)
>>
>> + . = ALIGN(PAGE_SIZE)
missing ";" ?
With that and your fixes, this function claims to mark 0kB and
lkdtm can still write. Reason is that _edata is 0xc11008 and start is
0x0c11000.
making _edata page aligned as well, does now try to mark one page, but then
we run into the next issue, that
static void change_page_attr(unsigned long addr, int numpages,
pte_t (*set) (pte_t))
{
pte_t *ptep;
int i;
for (i = 0; i < numpages; i++) {
ptep = walk_page_table(addr);
triggers this
if (WARN_ON_ONCE(!ptep))
break;
because the kernel decided to map this with a large page. So we need
to fix this function to then break the large page into a smaller chunk....
Christian
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