bpf: don't (ab)use instructions to store state

Storing state in reserved fields of instructions makes
it impossible to run verifier on programs already
marked as read-only. Allocate and use an array of
per-instruction state instead.

While touching the error path rename and move existing
jump target.
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

kernel/bpf/verifier.c

@@ -181,6 +181,10 @@ struct verifier_stack_elem {
 	struct verifier_stack_elem *next;
 };
 
+struct bpf_insn_aux_data {
+	enum bpf_reg_type ptr_type;	/* pointer type for load/store insns */
+};
+
 #define MAX_USED_MAPS 64 /* max number of maps accessed by one eBPF program */
 
 /* single container for all structs
@@ -197,6 +201,7 @@ struct verifier_env {
 	u32 id_gen;			/* used to generate unique reg IDs */
 	bool allow_ptr_leaks;
 	bool seen_direct_write;
+	struct bpf_insn_aux_data *insn_aux_data; /* array of per-insn state */
 };
 
 #define BPF_COMPLEXITY_LIMIT_INSNS	65536
@@ -2344,7 +2349,7 @@ static int do_check(struct verifier_env *env)
 				return err;
 
 		} else if (class == BPF_LDX) {
-			enum bpf_reg_type src_reg_type;
+			enum bpf_reg_type *prev_src_type, src_reg_type;
 
 			/* check for reserved fields is already done */
 
@@ -2374,16 +2379,18 @@ static int do_check(struct verifier_env *env)
 				continue;
 			}
 
-			if (insn->imm == 0) {
+			prev_src_type = &env->insn_aux_data[insn_idx].ptr_type;
+
+			if (*prev_src_type == NOT_INIT) {
 				/* saw a valid insn
 				 * dst_reg = *(u32 *)(src_reg + off)
-				 * use reserved 'imm' field to mark this insn
+				 * save type to validate intersecting paths
 				 */
-				insn->imm = src_reg_type;
+				*prev_src_type = src_reg_type;
 
-			} else if (src_reg_type != insn->imm &&
+			} else if (src_reg_type != *prev_src_type &&
 				   (src_reg_type == PTR_TO_CTX ||
-				    insn->imm == PTR_TO_CTX)) {
+				    *prev_src_type == PTR_TO_CTX)) {
 				/* ABuser program is trying to use the same insn
 				 * dst_reg = *(u32*) (src_reg + off)
 				 * with different pointer types:
@@ -2396,7 +2403,7 @@ static int do_check(struct verifier_env *env)
 			}
 
 		} else if (class == BPF_STX) {
-			enum bpf_reg_type dst_reg_type;
+			enum bpf_reg_type *prev_dst_type, dst_reg_type;
 
 			if (BPF_MODE(insn->code) == BPF_XADD) {
 				err = check_xadd(env, insn);
@@ -2424,11 +2431,13 @@ static int do_check(struct verifier_env *env)
 			if (err)
 				return err;
 
-			if (insn->imm == 0) {
-				insn->imm = dst_reg_type;
-			} else if (dst_reg_type != insn->imm &&
+			prev_dst_type = &env->insn_aux_data[insn_idx].ptr_type;
+
+			if (*prev_dst_type == NOT_INIT) {
+				*prev_dst_type = dst_reg_type;
+			} else if (dst_reg_type != *prev_dst_type &&
 				   (dst_reg_type == PTR_TO_CTX ||
-				    insn->imm == PTR_TO_CTX)) {
+				    *prev_dst_type == PTR_TO_CTX)) {
 				verbose("same insn cannot be used with different pointers\n");
 				return -EINVAL;
 			}
@@ -2686,10 +2695,11 @@ static void convert_pseudo_ld_imm64(struct verifier_env *env)
 static int convert_ctx_accesses(struct verifier_env *env)
 {
 	const struct bpf_verifier_ops *ops = env->prog->aux->ops;
+	const int insn_cnt = env->prog->len;
 	struct bpf_insn insn_buf[16], *insn;
 	struct bpf_prog *new_prog;
 	enum bpf_access_type type;
-	int i, insn_cnt, cnt;
+	int i, cnt, delta = 0;
 
 	if (ops->gen_prologue) {
 		cnt = ops->gen_prologue(insn_buf, env->seen_direct_write,
@@ -2703,18 +2713,16 @@ static int convert_ctx_accesses(struct verifier_env *env)
 			if (!new_prog)
 				return -ENOMEM;
 			env->prog = new_prog;
+			delta += cnt - 1;
 		}
 	}
 
 	if (!ops->convert_ctx_access)
 		return 0;
 
-	insn_cnt = env->prog->len;
-	insn = env->prog->insnsi;
+	insn = env->prog->insnsi + delta;
 
 	for (i = 0; i < insn_cnt; i++, insn++) {
-		u32 insn_delta;
-
 		if (insn->code == (BPF_LDX | BPF_MEM | BPF_W) ||
 		    insn->code == (BPF_LDX | BPF_MEM | BPF_DW))
 			type = BPF_READ;
@@ -2724,11 +2732,8 @@ static int convert_ctx_accesses(struct verifier_env *env)
 		else
 			continue;
 
-		if (insn->imm != PTR_TO_CTX) {
-			/* clear internal mark */
-			insn->imm = 0;
+		if (env->insn_aux_data[i].ptr_type != PTR_TO_CTX)
 			continue;
-		}
 
 		cnt = ops->convert_ctx_access(type, insn->dst_reg, insn->src_reg,
 					      insn->off, insn_buf, env->prog);
@@ -2737,18 +2742,16 @@ static int convert_ctx_accesses(struct verifier_env *env)
 			return -EINVAL;
 		}
 
-		new_prog = bpf_patch_insn_single(env->prog, i, insn_buf, cnt);
+		new_prog = bpf_patch_insn_single(env->prog, i + delta, insn_buf,
+						 cnt);
 		if (!new_prog)
 			return -ENOMEM;
 
-		insn_delta = cnt - 1;
+		delta += cnt - 1;
 
 		/* keep walking new program and skip insns we just inserted */
 		env->prog = new_prog;
-		insn      = new_prog->insnsi + i + insn_delta;
-
-		insn_cnt += insn_delta;
-		i        += insn_delta;
+		insn      = new_prog->insnsi + i + delta;
 	}
 
 	return 0;
@@ -2792,6 +2795,11 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr)
 	if (!env)
 		return -ENOMEM;
 
+	env->insn_aux_data = vzalloc(sizeof(struct bpf_insn_aux_data) *
+				     (*prog)->len);
+	ret = -ENOMEM;
+	if (!env->insn_aux_data)
+		goto err_free_env;
 	env->prog = *prog;
 
 	/* grab the mutex to protect few globals used by verifier */
@@ -2810,12 +2818,12 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr)
 		/* log_* values have to be sane */
 		if (log_size < 128 || log_size > UINT_MAX >> 8 ||
 		    log_level == 0 || log_ubuf == NULL)
-			goto free_env;
+			goto err_unlock;
 
 		ret = -ENOMEM;
 		log_buf = vmalloc(log_size);
 		if (!log_buf)
-			goto free_env;
+			goto err_unlock;
 	} else {
 		log_level = 0;
 	}
@@ -2884,14 +2892,16 @@ int bpf_check(struct bpf_prog **prog, union bpf_attr *attr)
 free_log_buf:
 	if (log_level)
 		vfree(log_buf);
-free_env:
 	if (!env->prog->aux->used_maps)
 		/* if we didn't copy map pointers into bpf_prog_info, release
 		 * them now. Otherwise free_bpf_prog_info() will release them.
 		 */
 		release_maps(env);
 	*prog = env->prog;
-	kfree(env);
+err_unlock:
 	mutex_unlock(&bpf_verifier_lock);
+	vfree(env->insn_aux_data);
+err_free_env:
+	kfree(env);
 	return ret;
 }