bpf: print liveness info to verifier log (4e92024a) · Commits · 戴 / test

kernel/bpf/verifier.c

+20 −4

Original line number	Diff line number	Diff line
		@@ -216,6 +216,17 @@ static const char * const reg_type_str[] = {
		[PTR_TO_PACKET_END] = "pkt_end",
		};

		static void print_liveness(struct bpf_verifier_env *env,
		enum bpf_reg_liveness live)
		{
		if (live & (REG_LIVE_READ \| REG_LIVE_WRITTEN))
		verbose(env, "_");
		if (live & REG_LIVE_READ)
		verbose(env, "r");
		if (live & REG_LIVE_WRITTEN)
		verbose(env, "w");
		}

		static void print_verifier_state(struct bpf_verifier_env *env,
		struct bpf_verifier_state *state)
		{
		@@ -228,7 +239,9 @@ static void print_verifier_state(struct bpf_verifier_env *env,
		t = reg->type;
		if (t == NOT_INIT)
		continue;
		verbose(env, " R%d=%s", i, reg_type_str[t]);
		verbose(env, " R%d", i);
		print_liveness(env, reg->live);
		verbose(env, "=%s", reg_type_str[t]);
		if ((t == SCALAR_VALUE \|\| t == PTR_TO_STACK) &&
		tnum_is_const(reg->var_off)) {
		/* reg->off should be 0 for SCALAR_VALUE */
		@@ -277,11 +290,14 @@ static void print_verifier_state(struct bpf_verifier_env *env,
		}
		}
		for (i = 0; i < state->allocated_stack / BPF_REG_SIZE; i++) {
		if (state->stack[i].slot_type[0] == STACK_SPILL)
		verbose(env, " fp%d=%s",
		(-i - 1) * BPF_REG_SIZE,
		if (state->stack[i].slot_type[0] == STACK_SPILL) {
		verbose(env, " fp%d",
		(-i - 1) * BPF_REG_SIZE);
		print_liveness(env, state->stack[i].spilled_ptr.live);
		verbose(env, "=%s",
		reg_type_str[state->stack[i].spilled_ptr.type]);
		}
		}
		verbose(env, "\n");
		}