bpf: move {prev_,}insn_idx into verifier env

Move prev_insn_idx and insn_idx from the do_check() function into
the verifier environment, so they can be read inside the various
helper functions for handling the instructions. It's easier to put
this into the environment rather than changing all call-sites only
to pass it along. insn_idx is useful in particular since this later
on allows to hold state in env->insn_aux_data[env->insn_idx].

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/include/linux/bpf_verifier.h b/include/linux/bpf_verifier.h
index c233efc106c608be173e5f2875042b13b9ef5d0f..3f84f3e87704a48b47b0fe0d39308524dbac0610 100644 (file)
--- a/include/linux/bpf_verifier.h
+++ b/include/linux/bpf_verifier.h
@@ -212,6 +212,8 @@ struct bpf_subprog_info {
  * one verifier_env per bpf_check() call
  */
 struct bpf_verifier_env {
+       u32 insn_idx;
+       u32 prev_insn_idx;
        struct bpf_prog *prog;          /* eBPF program being verified */
        const struct bpf_verifier_ops *ops;
        struct bpf_verifier_stack_elem *head; /* stack of verifier states to be processed */

diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 71d86e3024aeb93351d9b165aa0f9d2d0dfa5204..afa8515bbb34d0c373fcc98272c5494aa164f3f2 100644 (file)
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5650,7 +5650,6 @@ static int do_check(struct bpf_verifier_env *env)
        struct bpf_insn *insns = env->prog->insnsi;
        struct bpf_reg_state *regs;
        int insn_cnt = env->prog->len, i;
-       int insn_idx, prev_insn_idx = 0;
        int insn_processed = 0;
        bool do_print_state = false;
 
@@ -5670,19 +5669,19 @@ static int do_check(struct bpf_verifier_env *env)
                        BPF_MAIN_FUNC /* callsite */,
                        0 /* frameno */,
                        0 /* subprogno, zero == main subprog */);
-       insn_idx = 0;
+
        for (;;) {
                struct bpf_insn *insn;
                u8 class;
                int err;
 
-               if (insn_idx >= insn_cnt) {
+               if (env->insn_idx >= insn_cnt) {
                        verbose(env, "invalid insn idx %d insn_cnt %d\n",
-                               insn_idx, insn_cnt);
+                               env->insn_idx, insn_cnt);
                        return -EFAULT;
                }
 
-               insn = &insns[insn_idx];
+               insn = &insns[env->insn_idx];
                class = BPF_CLASS(insn->code);
 
                if (++insn_processed > BPF_COMPLEXITY_LIMIT_INSNS) {
@@ -5692,7 +5691,7 @@ static int do_check(struct bpf_verifier_env *env)
                        return -E2BIG;
                }
 
-               err = is_state_visited(env, insn_idx);
+               err = is_state_visited(env, env->insn_idx);
                if (err < 0)
                        return err;
                if (err == 1) {
@@ -5700,9 +5699,9 @@ static int do_check(struct bpf_verifier_env *env)
                        if (env->log.level) {
                                if (do_print_state)
                                        verbose(env, "\nfrom %d to %d: safe\n",
-                                               prev_insn_idx, insn_idx);
+                                               env->prev_insn_idx, env->insn_idx);
                                else
-                                       verbose(env, "%d: safe\n", insn_idx);
+                                       verbose(env, "%d: safe\n", env->insn_idx);
                        }
                        goto process_bpf_exit;
                }
@@ -5715,10 +5714,10 @@ static int do_check(struct bpf_verifier_env *env)
 
                if (env->log.level > 1 || (env->log.level && do_print_state)) {
                        if (env->log.level > 1)
-                               verbose(env, "%d:", insn_idx);
+                               verbose(env, "%d:", env->insn_idx);
                        else
                                verbose(env, "\nfrom %d to %d:",
-                                       prev_insn_idx, insn_idx);
+                                       env->prev_insn_idx, env->insn_idx);
                        print_verifier_state(env, state->frame[state->curframe]);
                        do_print_state = false;
                }
@@ -5729,20 +5728,20 @@ static int do_check(struct bpf_verifier_env *env)
                                .private_data   = env,
                        };
 
-                       verbose_linfo(env, insn_idx, "; ");
-                       verbose(env, "%d: ", insn_idx);
+                       verbose_linfo(env, env->insn_idx, "; ");
+                       verbose(env, "%d: ", env->insn_idx);
                        print_bpf_insn(&cbs, insn, env->allow_ptr_leaks);
                }
 
                if (bpf_prog_is_dev_bound(env->prog->aux)) {
-                       err = bpf_prog_offload_verify_insn(env, insn_idx,
-                                                          prev_insn_idx);
+                       err = bpf_prog_offload_verify_insn(env, env->insn_idx,
+                                                          env->prev_insn_idx);
                        if (err)
                                return err;
                }
 
                regs = cur_regs(env);
-               env->insn_aux_data[insn_idx].seen = true;
+               env->insn_aux_data[env->insn_idx].seen = true;
 
                if (class == BPF_ALU || class == BPF_ALU64) {
                        err = check_alu_op(env, insn);
@@ -5768,13 +5767,13 @@ static int do_check(struct bpf_verifier_env *env)
                        /* check that memory (src_reg + off) is readable,
                         * the state of dst_reg will be updated by this func
                         */
-                       err = check_mem_access(env, insn_idx, insn->src_reg, insn->off,
-                                              BPF_SIZE(insn->code), BPF_READ,
-                                              insn->dst_reg, false);
+                       err = check_mem_access(env, env->insn_idx, insn->src_reg,
+                                              insn->off, BPF_SIZE(insn->code),
+                                              BPF_READ, insn->dst_reg, false);
                        if (err)
                                return err;
 
-                       prev_src_type = &env->insn_aux_data[insn_idx].ptr_type;
+                       prev_src_type = &env->insn_aux_data[env->insn_idx].ptr_type;
 
                        if (*prev_src_type == NOT_INIT) {
                                /* saw a valid insn
@@ -5799,10 +5798,10 @@ static int do_check(struct bpf_verifier_env *env)
                        enum bpf_reg_type *prev_dst_type, dst_reg_type;
 
                        if (BPF_MODE(insn->code) == BPF_XADD) {
-                               err = check_xadd(env, insn_idx, insn);
+                               err = check_xadd(env, env->insn_idx, insn);
                                if (err)
                                        return err;
-                               insn_idx++;
+                               env->insn_idx++;
                                continue;
                        }
 
@@ -5818,13 +5817,13 @@ static int do_check(struct bpf_verifier_env *env)
                        dst_reg_type = regs[insn->dst_reg].type;
 
                        /* check that memory (dst_reg + off) is writeable */
-                       err = check_mem_access(env, insn_idx, insn->dst_reg, insn->off,
-                                              BPF_SIZE(insn->code), BPF_WRITE,
-                                              insn->src_reg, false);
+                       err = check_mem_access(env, env->insn_idx, insn->dst_reg,
+                                              insn->off, BPF_SIZE(insn->code),
+                                              BPF_WRITE, insn->src_reg, false);
                        if (err)
                                return err;
 
-                       prev_dst_type = &env->insn_aux_data[insn_idx].ptr_type;
+                       prev_dst_type = &env->insn_aux_data[env->insn_idx].ptr_type;
 
                        if (*prev_dst_type == NOT_INIT) {
                                *prev_dst_type = dst_reg_type;
@@ -5852,9 +5851,9 @@ static int do_check(struct bpf_verifier_env *env)
                        }
 
                        /* check that memory (dst_reg + off) is writeable */
-                       err = check_mem_access(env, insn_idx, insn->dst_reg, insn->off,
-                                              BPF_SIZE(insn->code), BPF_WRITE,
-                                              -1, false);
+                       err = check_mem_access(env, env->insn_idx, insn->dst_reg,
+                                              insn->off, BPF_SIZE(insn->code),
+                                              BPF_WRITE, -1, false);
                        if (err)
                                return err;
 
@@ -5872,9 +5871,9 @@ static int do_check(struct bpf_verifier_env *env)
                                }
 
                                if (insn->src_reg == BPF_PSEUDO_CALL)
-                                       err = check_func_call(env, insn, &insn_idx);
+                                       err = check_func_call(env, insn, &env->insn_idx);
                                else
-                                       err = check_helper_call(env, insn->imm, insn_idx);
+                                       err = check_helper_call(env, insn->imm, env->insn_idx);
                                if (err)
                                        return err;
 
@@ -5887,7 +5886,7 @@ static int do_check(struct bpf_verifier_env *env)
                                        return -EINVAL;
                                }
 
-                               insn_idx += insn->off + 1;
+                               env->insn_idx += insn->off + 1;
                                continue;
 
                        } else if (opcode == BPF_EXIT) {
@@ -5901,8 +5900,8 @@ static int do_check(struct bpf_verifier_env *env)
 
                                if (state->curframe) {
                                        /* exit from nested function */
-                                       prev_insn_idx = insn_idx;
-                                       err = prepare_func_exit(env, &insn_idx);
+                                       env->prev_insn_idx = env->insn_idx;
+                                       err = prepare_func_exit(env, &env->insn_idx);
                                        if (err)
                                                return err;
                                        do_print_state = true;
@@ -5932,7 +5931,8 @@ static int do_check(struct bpf_verifier_env *env)
                                if (err)
                                        return err;
 process_bpf_exit:
-                               err = pop_stack(env, &prev_insn_idx, &insn_idx);
+                               err = pop_stack(env, &env->prev_insn_idx,
+                                               &env->insn_idx);
                                if (err < 0) {
                                        if (err != -ENOENT)
                                                return err;
@@ -5942,7 +5942,7 @@ process_bpf_exit:
                                        continue;
                                }
                        } else {
-                               err = check_cond_jmp_op(env, insn, &insn_idx);
+                               err = check_cond_jmp_op(env, insn, &env->insn_idx);
                                if (err)
                                        return err;
                        }
@@ -5959,8 +5959,8 @@ process_bpf_exit:
                                if (err)
                                        return err;
 
-                               insn_idx++;
-                               env->insn_aux_data[insn_idx].seen = true;
+                               env->insn_idx++;
+                               env->insn_aux_data[env->insn_idx].seen = true;
                        } else {
                                verbose(env, "invalid BPF_LD mode\n");
                                return -EINVAL;
@@ -5970,7 +5970,7 @@ process_bpf_exit:
                        return -EINVAL;
                }
 
-               insn_idx++;
+               env->insn_idx++;
        }
 
        verbose(env, "processed %d insns (limit %d), stack depth ",