diff options
Diffstat (limited to 'kernel/bpf/verifier.c')
| -rw-r--r-- | kernel/bpf/verifier.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 8caa7322f031..c419005a29dc 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -9984,9 +9984,13 @@ static bool in_rbtree_lock_required_cb(struct bpf_verifier_env *env) return is_rbtree_lock_required_kfunc(kfunc_btf_id); } -static bool retval_range_within(struct bpf_retval_range range, const struct bpf_reg_state *reg) +static bool retval_range_within(struct bpf_retval_range range, const struct bpf_reg_state *reg, + bool return_32bit) { - return range.minval <= reg->smin_value && reg->smax_value <= range.maxval; + if (return_32bit) + return range.minval <= reg->s32_min_value && reg->s32_max_value <= range.maxval; + else + return range.minval <= reg->smin_value && reg->smax_value <= range.maxval; } static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx) @@ -10023,8 +10027,8 @@ static int prepare_func_exit(struct bpf_verifier_env *env, int *insn_idx) if (err) return err; - /* enforce R0 return value range */ - if (!retval_range_within(callee->callback_ret_range, r0)) { + /* enforce R0 return value range, and bpf_callback_t returns 64bit */ + if (!retval_range_within(callee->callback_ret_range, r0, false)) { verbose_invalid_scalar(env, r0, callee->callback_ret_range, "At callback return", "R0"); return -EINVAL; @@ -15698,6 +15702,7 @@ static int check_return_code(struct bpf_verifier_env *env, int regno, const char int err; struct bpf_func_state *frame = env->cur_state->frame[0]; const bool is_subprog = frame->subprogno; + bool return_32bit = false; /* LSM and struct_ops func-ptr's return type could be "void" */ if (!is_subprog || frame->in_exception_callback_fn) { @@ -15809,6 +15814,7 @@ static int check_return_code(struct bpf_verifier_env *env, int regno, const char /* no restricted range, any return value is allowed */ if (range.minval == S32_MIN && range.maxval == S32_MAX) return 0; + return_32bit = true; } else if (!env->prog->aux->attach_func_proto->type) { /* Make sure programs that attach to void * hooks don't try to modify return value. @@ -15839,7 +15845,7 @@ enforce_retval: if (err) return err; - if (!retval_range_within(range, reg)) { + if (!retval_range_within(range, reg, return_32bit)) { verbose_invalid_scalar(env, reg, range, exit_ctx, reg_name); if (!is_subprog && prog->expected_attach_type == BPF_LSM_CGROUP && |