1 files changed, 47 insertions, 18 deletions

diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index 7505f515aac3..3b8d689ece5d 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -641,6 +641,7 @@ static void __bpf_struct_ops_map_free(struct bpf_map *map)
 		bpf_jit_uncharge_modmem(PAGE_SIZE);
 	}
 	bpf_map_area_free(st_map->uvalue);
+	btf_put(st_map->btf);
 	bpf_map_area_free(st_map);
 }
 
@@ -669,7 +670,8 @@ static void bpf_struct_ops_map_free(struct bpf_map *map)
 static int bpf_struct_ops_map_alloc_check(union bpf_attr *attr)
 {
 	if (attr->key_size != sizeof(unsigned int) || attr->max_entries != 1 ||
-	    (attr->map_flags & ~BPF_F_LINK) || !attr->btf_vmlinux_value_type_id)
+	    (attr->map_flags & ~(BPF_F_LINK | BPF_F_VTYPE_BTF_OBJ_FD)) ||
+	    !attr->btf_vmlinux_value_type_id)
 		return -EINVAL;
 	return 0;
 }
@@ -681,15 +683,36 @@ static struct bpf_map *bpf_struct_ops_map_alloc(union bpf_attr *attr)
 	struct bpf_struct_ops_map *st_map;
 	const struct btf_type *t, *vt;
 	struct bpf_map *map;
+	struct btf *btf;
 	int ret;
 
-	st_ops_desc = bpf_struct_ops_find_value(btf_vmlinux, attr->btf_vmlinux_value_type_id);
-	if (!st_ops_desc)
-		return ERR_PTR(-ENOTSUPP);
+	if (attr->map_flags & BPF_F_VTYPE_BTF_OBJ_FD) {
+		/* The map holds btf for its whole life time. */
+		btf = btf_get_by_fd(attr->value_type_btf_obj_fd);
+		if (IS_ERR(btf))
+			return ERR_CAST(btf);
+		if (!btf_is_module(btf)) {
+			btf_put(btf);
+			return ERR_PTR(-EINVAL);
+		}
+	} else {
+		btf = bpf_get_btf_vmlinux();
+		if (IS_ERR(btf))
+			return ERR_CAST(btf);
+		btf_get(btf);
+	}
+
+	st_ops_desc = bpf_struct_ops_find_value(btf, attr->btf_vmlinux_value_type_id);
+	if (!st_ops_desc) {
+		ret = -ENOTSUPP;
+		goto errout;
+	}
 
 	vt = st_ops_desc->value_type;
-	if (attr->value_size != vt->size)
-		return ERR_PTR(-EINVAL);
+	if (attr->value_size != vt->size) {
+		ret = -EINVAL;
+		goto errout;
+	}
 
 	t = st_ops_desc->type;
 
@@ -700,17 +723,17 @@ static struct bpf_map *bpf_struct_ops_map_alloc(union bpf_attr *attr)
 		(vt->size - sizeof(struct bpf_struct_ops_value));
 
 	st_map = bpf_map_area_alloc(st_map_size, NUMA_NO_NODE);
-	if (!st_map)
-		return ERR_PTR(-ENOMEM);
+	if (!st_map) {
+		ret = -ENOMEM;
+		goto errout;
+	}
 
 	st_map->st_ops_desc = st_ops_desc;
 	map = &st_map->map;
 
 	ret = bpf_jit_charge_modmem(PAGE_SIZE);
-	if (ret) {
-		__bpf_struct_ops_map_free(map);
-		return ERR_PTR(ret);
-	}
+	if (ret)
+		goto errout_free;
 
 	st_map->image = arch_alloc_bpf_trampoline(PAGE_SIZE);
 	if (!st_map->image) {
@@ -719,24 +742,30 @@ static struct bpf_map *bpf_struct_ops_map_alloc(union bpf_attr *attr)
 		 * here.
 		 */
 		bpf_jit_uncharge_modmem(PAGE_SIZE);
-		__bpf_struct_ops_map_free(map);
-		return ERR_PTR(-ENOMEM);
+		ret = -ENOMEM;
+		goto errout_free;
 	}
 	st_map->uvalue = bpf_map_area_alloc(vt->size, NUMA_NO_NODE);
 	st_map->links =
 		bpf_map_area_alloc(btf_type_vlen(t) * sizeof(struct bpf_links *),
 				   NUMA_NO_NODE);
 	if (!st_map->uvalue || !st_map->links) {
-		__bpf_struct_ops_map_free(map);
-		return ERR_PTR(-ENOMEM);
+		ret = -ENOMEM;
+		goto errout_free;
 	}
-
-	st_map->btf = btf_vmlinux;
+	st_map->btf = btf;
 
 	mutex_init(&st_map->lock);
 	bpf_map_init_from_attr(map, attr);
 
 	return map;
+
+errout_free:
+	__bpf_struct_ops_map_free(map);
+errout:
+	btf_put(btf);
+
+	return ERR_PTR(ret);
 }
 
 static u64 bpf_struct_ops_map_mem_usage(const struct bpf_map *map)