1 files changed, 74 insertions, 44 deletions

diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 9f1493705f40..4d09e610777f 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -350,6 +350,20 @@ struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
 	return prog_adj;
 }
 
+void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp)
+{
+	int i;
+
+	for (i = 0; i < fp->aux->func_cnt; i++)
+		bpf_prog_kallsyms_del(fp->aux->func[i]);
+}
+
+void bpf_prog_kallsyms_del_all(struct bpf_prog *fp)
+{
+	bpf_prog_kallsyms_del_subprogs(fp);
+	bpf_prog_kallsyms_del(fp);
+}
+
 #ifdef CONFIG_BPF_JIT
 /* All BPF JIT sysctl knobs here. */
 int bpf_jit_enable   __read_mostly = IS_BUILTIN(CONFIG_BPF_JIT_ALWAYS_ON);
@@ -1434,6 +1448,17 @@ static int bpf_check_tail_call(const struct bpf_prog *fp)
 	return 0;
 }
 
+static void bpf_prog_select_func(struct bpf_prog *fp)
+{
+#ifndef CONFIG_BPF_JIT_ALWAYS_ON
+	u32 stack_depth = max_t(u32, fp->aux->stack_depth, 1);
+
+	fp->bpf_func = interpreters[(round_up(stack_depth, 32) / 32) - 1];
+#else
+	fp->bpf_func = __bpf_prog_ret0_warn;
+#endif
+}
+
 /**
  *	bpf_prog_select_runtime - select exec runtime for BPF program
  *	@fp: bpf_prog populated with internal BPF program
@@ -1444,13 +1469,13 @@ static int bpf_check_tail_call(const struct bpf_prog *fp)
  */
 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err)
 {
-#ifndef CONFIG_BPF_JIT_ALWAYS_ON
-	u32 stack_depth = max_t(u32, fp->aux->stack_depth, 1);
+	/* In case of BPF to BPF calls, verifier did all the prep
+	 * work with regards to JITing, etc.
+	 */
+	if (fp->bpf_func)
+		goto finalize;
 
-	fp->bpf_func = interpreters[(round_up(stack_depth, 32) / 32) - 1];
-#else
-	fp->bpf_func = __bpf_prog_ret0_warn;
-#endif
+	bpf_prog_select_func(fp);
 
 	/* eBPF JITs can rewrite the program in case constant
 	 * blinding is active. However, in case of error during
@@ -1471,6 +1496,8 @@ struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err)
 		if (*err)
 			return fp;
 	}
+
+finalize:
 	bpf_prog_lock_ro(fp);
 
 	/* The tail call compatibility check can only be done at
@@ -1511,11 +1538,12 @@ static struct {
 	.null_prog = NULL,
 };
 
-struct bpf_prog_array __rcu *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags)
+struct bpf_prog_array *bpf_prog_array_alloc(u32 prog_cnt, gfp_t flags)
 {
 	if (prog_cnt)
 		return kzalloc(sizeof(struct bpf_prog_array) +
-			       sizeof(struct bpf_prog *) * (prog_cnt + 1),
+			       sizeof(struct bpf_prog_array_item) *
+			       (prog_cnt + 1),
 			       flags);
 
 	return &empty_prog_array.hdr;
@@ -1529,43 +1557,45 @@ void bpf_prog_array_free(struct bpf_prog_array __rcu *progs)
 	kfree_rcu(progs, rcu);
 }
 
-int bpf_prog_array_length(struct bpf_prog_array __rcu *progs)
+int bpf_prog_array_length(struct bpf_prog_array __rcu *array)
 {
-	struct bpf_prog **prog;
+	struct bpf_prog_array_item *item;
 	u32 cnt = 0;
 
 	rcu_read_lock();
-	prog = rcu_dereference(progs)->progs;
-	for (; *prog; prog++)
-		if (*prog != &dummy_bpf_prog.prog)
+	item = rcu_dereference(array)->items;
+	for (; item->prog; item++)
+		if (item->prog != &dummy_bpf_prog.prog)
 			cnt++;
 	rcu_read_unlock();
 	return cnt;
 }
 
-static bool bpf_prog_array_copy_core(struct bpf_prog **prog,
+
+static bool bpf_prog_array_copy_core(struct bpf_prog_array __rcu *array,
 				     u32 *prog_ids,
 				     u32 request_cnt)
 {
+	struct bpf_prog_array_item *item;
 	int i = 0;
 
-	for (; *prog; prog++) {
-		if (*prog == &dummy_bpf_prog.prog)
+	item = rcu_dereference(array)->items;
+	for (; item->prog; item++) {
+		if (item->prog == &dummy_bpf_prog.prog)
 			continue;
-		prog_ids[i] = (*prog)->aux->id;
+		prog_ids[i] = item->prog->aux->id;
 		if (++i == request_cnt) {
-			prog++;
+			item++;
 			break;
 		}
 	}
 
-	return !!(*prog);
+	return !!(item->prog);
 }
 
-int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
+int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *array,
 				__u32 __user *prog_ids, u32 cnt)
 {
-	struct bpf_prog **prog;
 	unsigned long err = 0;
 	bool nospc;
 	u32 *ids;
@@ -1584,8 +1614,7 @@ int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
 	if (!ids)
 		return -ENOMEM;
 	rcu_read_lock();
-	prog = rcu_dereference(progs)->progs;
-	nospc = bpf_prog_array_copy_core(prog, ids, cnt);
+	nospc = bpf_prog_array_copy_core(array, ids, cnt);
 	rcu_read_unlock();
 	err = copy_to_user(prog_ids, ids, cnt * sizeof(u32));
 	kfree(ids);
@@ -1596,14 +1625,14 @@ int bpf_prog_array_copy_to_user(struct bpf_prog_array __rcu *progs,
 	return 0;
 }
 
-void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *progs,
+void bpf_prog_array_delete_safe(struct bpf_prog_array __rcu *array,
 				struct bpf_prog *old_prog)
 {
-	struct bpf_prog **prog = progs->progs;
+	struct bpf_prog_array_item *item = array->items;
 
-	for (; *prog; prog++)
-		if (*prog == old_prog) {
-			WRITE_ONCE(*prog, &dummy_bpf_prog.prog);
+	for (; item->prog; item++)
+		if (item->prog == old_prog) {
+			WRITE_ONCE(item->prog, &dummy_bpf_prog.prog);
 			break;
 		}
 }
@@ -1614,7 +1643,7 @@ int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
 			struct bpf_prog_array **new_array)
 {
 	int new_prog_cnt, carry_prog_cnt = 0;
-	struct bpf_prog **existing_prog;
+	struct bpf_prog_array_item *existing;
 	struct bpf_prog_array *array;
 	bool found_exclude = false;
 	int new_prog_idx = 0;
@@ -1623,15 +1652,15 @@ int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
 	 * the new array.
 	 */
 	if (old_array) {
-		existing_prog = old_array->progs;
-		for (; *existing_prog; existing_prog++) {
-			if (*existing_prog == exclude_prog) {
+		existing = old_array->items;
+		for (; existing->prog; existing++) {
+			if (existing->prog == exclude_prog) {
 				found_exclude = true;
 				continue;
 			}
-			if (*existing_prog != &dummy_bpf_prog.prog)
+			if (existing->prog != &dummy_bpf_prog.prog)
 				carry_prog_cnt++;
-			if (*existing_prog == include_prog)
+			if (existing->prog == include_prog)
 				return -EEXIST;
 		}
 	}
@@ -1657,15 +1686,17 @@ int bpf_prog_array_copy(struct bpf_prog_array __rcu *old_array,
 
 	/* Fill in the new prog array */
 	if (carry_prog_cnt) {
-		existing_prog = old_array->progs;
-		for (; *existing_prog; existing_prog++)
-			if (*existing_prog != exclude_prog &&
-			    *existing_prog != &dummy_bpf_prog.prog)
-				array->progs[new_prog_idx++] = *existing_prog;
+		existing = old_array->items;
+		for (; existing->prog; existing++)
+			if (existing->prog != exclude_prog &&
+			    existing->prog != &dummy_bpf_prog.prog) {
+				array->items[new_prog_idx++].prog =
+					existing->prog;
+			}
 	}
 	if (include_prog)
-		array->progs[new_prog_idx++] = include_prog;
-	array->progs[new_prog_idx] = NULL;
+		array->items[new_prog_idx++].prog = include_prog;
+	array->items[new_prog_idx].prog = NULL;
 	*new_array = array;
 	return 0;
 }
@@ -1674,7 +1705,6 @@ int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
 			     u32 *prog_ids, u32 request_cnt,
 			     u32 *prog_cnt)
 {
-	struct bpf_prog **prog;
 	u32 cnt = 0;
 
 	if (array)
@@ -1687,8 +1717,7 @@ int bpf_prog_array_copy_info(struct bpf_prog_array __rcu *array,
 		return 0;
 
 	/* this function is called under trace/bpf_trace.c: bpf_event_mutex */
-	prog = rcu_dereference_check(array, 1)->progs;
-	return bpf_prog_array_copy_core(prog, prog_ids, request_cnt) ? -ENOSPC
+	return bpf_prog_array_copy_core(array, prog_ids, request_cnt) ? -ENOSPC
 								     : 0;
 }
 
@@ -1766,6 +1795,7 @@ const struct bpf_func_proto bpf_get_current_comm_proto __weak;
 const struct bpf_func_proto bpf_sock_map_update_proto __weak;
 const struct bpf_func_proto bpf_sock_hash_update_proto __weak;
 const struct bpf_func_proto bpf_get_current_cgroup_id_proto __weak;
+const struct bpf_func_proto bpf_get_local_storage_proto __weak;
 
 const struct bpf_func_proto * __weak bpf_get_trace_printk_proto(void)
 {