bpf: introduce verifier internal test flag (10d274e8) · Commits · 戴 / test

include/linux/bpf_verifier.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -355,6 +355,7 @@ struct bpf_verifier_env {
		struct bpf_verifier_stack_elem head; / stack of verifier states to be processed */
		int stack_size; /* number of states to be processed */
		bool strict_alignment; /* perform strict pointer alignment checks */
		bool test_state_freq; /* test verifier with different pruning frequency */
		struct bpf_verifier_state cur_state; / current verifier state */
		struct bpf_verifier_state_list *explored_states; / search pruning optimization */
		struct bpf_verifier_state_list *free_list;

+3 −0

Original line number	Diff line number	Diff line
		@@ -285,6 +285,9 @@ enum bpf_attach_type {
		*/
		#define BPF_F_TEST_RND_HI32 (1U << 2)

		/* The verifier internal test flag. Behavior is undefined */
		#define BPF_F_TEST_STATE_FREQ (1U << 3)

		/* When BPF ldimm64's insn[0].src_reg != 0 then this can have
		* two extensions:
		*

+1 −0

Original line number	Diff line number	Diff line
		@@ -1629,6 +1629,7 @@ static int bpf_prog_load(union bpf_attr attr, union bpf_attr __user uattr)

		if (attr->prog_flags & ~(BPF_F_STRICT_ALIGNMENT \|
		BPF_F_ANY_ALIGNMENT \|
		BPF_F_TEST_STATE_FREQ \|
		BPF_F_TEST_RND_HI32))
		return -EINVAL;

+4 −1

Original line number	Diff line number	Diff line
		@@ -7222,7 +7222,7 @@ static int is_state_visited(struct bpf_verifier_env *env, int insn_idx)
		struct bpf_verifier_state_list sl, *pprev;
		struct bpf_verifier_state cur = env->cur_state, new;
		int i, j, err, states_cnt = 0;
		bool add_new_state = false;
		bool add_new_state = env->test_state_freq ? true : false;

		cur->last_insn_idx = env->prev_insn_idx;
		if (!env->insn_aux_data[insn_idx].prune_point)
		@@ -9262,6 +9262,9 @@ int bpf_check(struct bpf_prog *prog, union bpf_attr attr,

		env->allow_ptr_leaks = is_priv;

		if (is_priv)
		env->test_state_freq = attr->prog_flags & BPF_F_TEST_STATE_FREQ;

		ret = replace_map_fd_with_map_ptr(env);
		if (ret < 0)
		goto skip_full_check;