util: Fix parse_maps to handle anonymous shared mappings

In commit 99eb3d09
we started to use self-contained shared memory
region but it revealed the problem that anonymous
sgared mappings might be parsed by parse_maps incorrectly,
so fix it and be ready to get anon-shared mappings.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>

util.c

@@ -290,12 +290,14 @@ int parse_maps(pid_t pid, struct list_head *vma_area_list, bool use_map_files)
 			/*
 			 * No file but mapping -- anonymous one.
 			 */
-			if (vma_area->vma.flags & MAP_SHARED)
-				goto err_bogus_mapping;
-
-			vma_area->vma.flags  |= MAP_ANONYMOUS;
+			if (vma_area->vma.flags & MAP_SHARED) {
+				vma_area->vma.status |= VMA_ANON_SHARED;
+				vma_area->shmid = ino;
+			} else {
 				vma_area->vma.status |= VMA_ANON_PRIVATE;
 			}
+			vma_area->vma.flags  |= MAP_ANONYMOUS;
+		}
 
 		list_add_tail(&vma_area->list, vma_area_list);
 	}
@@ -314,9 +316,9 @@ err:
 	return ret;
 
 err_bogus_mapping:
-	pr_err("Bogus mapping %lx-%lx\n",
-	       vma_area->vma.start,
-	       vma_area->vma.end);
+	pr_err("Bogus mapping %lx-%lx (flags: %x vm_file_fd: %d)\n",
+	       vma_area->vma.start, vma_area->vma.end,
+	       vma_area->vma.flags, vma_area->vm_file_fd);
 	goto err;
 }