dump,restore: Dump and restore vDSO area from userspace

There is no need to force kernel to remap vDSO area, we
can do that from the user-space as well.
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

restorer.c

@@ -220,18 +220,6 @@ self_len_end:
 			if (final_vma_entry(vma_entry))
 				break;
 
-			if (vma_entry_is(vma_entry, VMA_AREA_VDSO)) {
-				ret = sys_prctl(PR_SETUP_VDSO_AT, vma_entry->start,
-						0, 0, 0);
-				if (ret) {
-					write_num_n(__LINE__);
-					write_hex_n(vma_entry->start);
-					write_num_n(ret);
-					goto core_restore_end;
-				}
-				continue;
-			}
-
 			if (!vma_entry_is(vma_entry, VMA_AREA_REGULAR))
 				continue;
 

util.c

@@ -322,7 +322,7 @@ int parse_maps(pid_t pid, struct list_head *vma_area_list, bool use_map_files)
 		} else if (strstr(big_buffer, "[vsyscall]")) {
 			vma_area->vma.status |= VMA_AREA_VSYSCALL;
 		} else if (strstr(big_buffer, "[vdso]")) {
-			vma_area->vma.status |= VMA_AREA_VDSO;
+			vma_area->vma.status |= VMA_AREA_REGULAR | VMA_AREA_VDSO;
 		} else if (strstr(big_buffer, "[heap]")) {
 			vma_area->vma.status |= VMA_AREA_REGULAR | VMA_AREA_HEAP;
 		} else {