static void do_ops(int unused, struct host_vm_op *ops, int last)
{
struct host_vm_op *op;
int i;
for(i = 0; i <= last; i++){
op = &ops[i];
switch(op->type){
case MMAP:
os_map_memory((void *) op->u.mmap.addr, op->u.mmap.fd,
op->u.mmap.offset, op->u.mmap.len,
op->u.mmap.r, op->u.mmap.w,
op->u.mmap.x);
break;
case MUNMAP:
os_unmap_memory((void *) op->u.munmap.addr,
op->u.munmap.len);
break;
case MPROTECT:
protect_memory(op->u.mprotect.addr, op->u.munmap.len,
op->u.mprotect.r, op->u.mprotect.w,
op->u.mprotect.x, 1);
break;
default:
printk("Unknown op type %d in do_ops\n", op->type);
break;
}
}
}
static void flush_kernel_vm_range(unsigned long start, unsigned long end,
int update_seq)
{
struct mm_struct *mm;
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
unsigned long addr;
int updated = 0, err;
mm = &init_mm;
for(addr = start; addr < end;){
pgd = pgd_offset(mm, addr);
pmd = pmd_offset(pgd, addr);
if(pmd_present(*pmd)){
pte = pte_offset_kernel(pmd, addr);
if(!pte_present(*pte) || pte_newpage(*pte)){
updated = 1;
err = os_unmap_memory((void *) addr,
PAGE_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
if(pte_present(*pte))
map_memory(addr,
pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 1, 1, 1);
}
else if(pte_newprot(*pte)){
updated = 1;
protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
}
addr += PAGE_SIZE;
}
else {
if(pmd_newpage(*pmd)){
updated = 1;
err = os_unmap_memory((void *) addr, PMD_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr += PMD_SIZE;
}
}
if(updated && update_seq) atomic_inc(&vmchange_seq);
}
void flush_tlb_kernel_range_skas(unsigned long start, unsigned long end)
{
struct mm_struct *mm;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
unsigned long addr, last;
int updated = 0, err;
mm = &init_mm;
for(addr = start; addr < end;){
pgd = pgd_offset(mm, addr);
pud = pud_offset(pgd, addr);
pmd = pmd_offset(pud, addr);
if(!pgd_present(*pgd)){
if(pgd_newpage(*pgd)){
updated = 1;
last = addr + PGDIR_SIZE;
if(last > end)
last = end;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr += PGDIR_SIZE;
continue;
}
pud = pud_offset(pgd, addr);
if(!pud_present(*pud)){
if(pud_newpage(*pud)){
updated = 1;
last = addr + PUD_SIZE;
if(last > end)
last = end;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr += PUD_SIZE;
continue;
}
pmd = pmd_offset(pud, addr);
if(!pmd_present(*pmd)){
if(pmd_newpage(*pmd)){
updated = 1;
last = addr + PMD_SIZE;
if(last > end)
last = end;
err = os_unmap_memory((void *) addr,
last - addr);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
}
addr += PMD_SIZE;
continue;
}
pte = pte_offset_kernel(pmd, addr);
if(!pte_present(*pte) || pte_newpage(*pte)){
updated = 1;
err = os_unmap_memory((void *) addr, PAGE_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n", -err);
if(pte_present(*pte))
map_memory(addr, pte_val(*pte) & PAGE_MASK,
PAGE_SIZE, 1, 1, 1);
}
else if(pte_newprot(*pte)){
updated = 1;
protect_memory(addr, PAGE_SIZE, 1, 1, 1, 1);
}
addr += PAGE_SIZE;
}
}
static void fix_range(struct mm_struct *mm, unsigned long start_addr,
unsigned long end_addr, int force)
{
pgd_t *npgd;
pmd_t *npmd;
pte_t *npte;
unsigned long addr;
int r, w, x, err;
if((current->thread.mode.tt.extern_pid != -1) &&
(current->thread.mode.tt.extern_pid != os_getpid()))
panic("fix_range fixing wrong address space, current = 0x%p",
current);
if(mm == NULL) return;
for(addr=start_addr;addr<end_addr;){
if(addr == TASK_SIZE){
/* Skip over kernel text, kernel data, and physical
* memory, which don't have ptes, plus kernel virtual
* memory, which is flushed separately, and remap
* the process stack. The only way to get here is
* if (end_addr == STACK_TOP) > TASK_SIZE, which is
* only true in the honeypot case.
*/
addr = STACK_TOP - ABOVE_KMEM;
continue;
}
npgd = pgd_offset(mm, addr);
npmd = pmd_offset(npgd, addr);
if(pmd_present(*npmd)){
npte = pte_offset_kernel(npmd, addr);
r = pte_read(*npte);
w = pte_write(*npte);
x = pte_exec(*npte);
if(!pte_dirty(*npte)) w = 0;
if(!pte_young(*npte)){
r = 0;
w = 0;
}
if(force || pte_newpage(*npte)){
err = os_unmap_memory((void *) addr,
PAGE_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
if(pte_present(*npte))
map_memory(addr,
pte_val(*npte) & PAGE_MASK,
PAGE_SIZE, r, w, x);
}
else if(pte_newprot(*npte)){
protect_memory(addr, PAGE_SIZE, r, w, x, 1);
}
*npte = pte_mkuptodate(*npte);
addr += PAGE_SIZE;
}
else {
if(force || pmd_newpage(*npmd)){
err = os_unmap_memory((void *) addr, PMD_SIZE);
if(err < 0)
panic("munmap failed, errno = %d\n",
-err);
pmd_mkuptodate(*npmd);
}
addr += PMD_SIZE;
}
}
}
