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restore: Iterate tgt vmas by number, not by terminating point

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2013-10-29 12:52:01 +04:00
parent 55a04580d5
commit d7db85e9dc
2 changed files with 23 additions and 14 deletions
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2
cr-restore.c
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@ -2000,7 +2000,7 @@ static VmaEntry *vma_list_remap(void *addr, unsigned long len, struct vm_area_li
vma++;
}
vma->start = 0;
vma->start = 1;
free_mappings(vmas);
return ret;

35
pie/restorer.c
View File

@ -578,6 +578,7 @@ static int unmap_old_vmas(void *premmapped_addr, unsigned long premmapped_len,
long __export_restore_task(struct task_restore_core_args *args)
{
long ret = -1;
int i;
VmaEntry *vma_entry;
unsigned long va;
@ -615,7 +616,9 @@ long __export_restore_task(struct task_restore_core_args *args)
goto core_restore_end;
/* Shift private vma-s to the left */
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
for (i = 0; i < args->nr_vmas; i++) {
vma_entry = args->tgt_vmas + i;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
@ -640,8 +643,9 @@ long __export_restore_task(struct task_restore_core_args *args)
}
/* Shift private vma-s to the right */
for (vma_entry = args->tgt_vmas + args->nr_vmas -1;
vma_entry >= args->tgt_vmas; vma_entry--) {
for (i = args->nr_vmas - 1; i >= 0; i--) {
vma_entry = args->tgt_vmas + i;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
@ -668,7 +672,9 @@ long __export_restore_task(struct task_restore_core_args *args)
/*
* OK, lets try to map new one.
*/
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
for (i = 0; i < args->nr_vmas; i++) {
vma_entry = args->tgt_vmas + i;
if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
continue;
@ -687,7 +693,9 @@ long __export_restore_task(struct task_restore_core_args *args)
* Walk though all VMAs again to drop PROT_WRITE
* if it was not there.
*/
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
for (i = 0; i < args->nr_vmas; i++) {
vma_entry = args->tgt_vmas + i;
if (!(vma_entry_is(vma_entry, VMA_AREA_REGULAR)))
continue;
@ -712,30 +720,31 @@ long __export_restore_task(struct task_restore_core_args *args)
/*
* Finally restore madivse() bits
*/
for (vma_entry = args->tgt_vmas; vma_entry->start != 0; vma_entry++) {
unsigned long i;
for (i = 0; i < args->nr_vmas; i++) {
unsigned long m;
vma_entry = args->tgt_vmas + i;
if (!vma_entry->has_madv || !vma_entry->madv)
continue;
for (i = 0; i < sizeof(vma_entry->madv) * 8; i++) {
if (vma_entry->madv & (1ul << i)) {
for (m = 0; m < sizeof(vma_entry->madv) * 8; m++) {
if (vma_entry->madv & (1ul << m)) {
ret = sys_madvise(vma_entry->start,
vma_entry_len(vma_entry),
i);
m);
if (ret) {
pr_err("madvise(%"PRIx64", %"PRIu64", %ld) "
"failed with %ld\n",
vma_entry->start,
vma_entry_len(vma_entry),
i, ret);
m, ret);
goto core_restore_end;
}
}
}
}
sys_munmap(args->tgt_vmas,
((void *)(vma_entry + 1) - ((void *)args->tgt_vmas)));
sys_munmap(args->tgt_vmas, args->nr_vmas * sizeof(VmaEntry));
ret = sys_munmap(args->shmems, SHMEMS_SIZE);
if (ret < 0) {