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532 lines
23 KiB
532 lines
23 KiB
(*
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* Copyright (c) 2016 - present Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*)
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open! Utils
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module F = Format
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module L = Logging
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(** Create a taint analysis from a trace domain *)
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module Summary = Summary.Make(struct
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type summary = QuandarySummary.t
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let update_payload summary payload =
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{ payload with Specs.quandary = Some summary; }
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let read_from_payload payload =
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match payload.Specs.quandary with
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| Some summary -> summary
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| None -> []
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end)
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module Make (TaintSpec : TaintSpec.S) = struct
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module TraceDomain = TaintSpec.Trace
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module TaintDomain = AccessTree.Make (TraceDomain)
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module IdMapDomain = IdAccessPathMapDomain
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module Domain = struct
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type astate =
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{
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access_tree : TaintDomain.astate; (* mapping of access paths to trace sets *)
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id_map : IdMapDomain.astate; (* mapping of id's to access paths for normalization *)
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}
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let initial =
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let access_tree = TaintDomain.initial in
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let id_map = IdMapDomain.initial in
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{ access_tree; id_map; }
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let (<=) ~lhs ~rhs =
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if lhs == rhs
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then true
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else
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TaintDomain.(<=) ~lhs:lhs.access_tree ~rhs:rhs.access_tree &&
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IdMapDomain.(<=) ~lhs:lhs.id_map ~rhs:rhs.id_map
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let join astate1 astate2 =
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if astate1 == astate2
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then astate1
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else
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let access_tree = TaintDomain.join astate1.access_tree astate2.access_tree in
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let id_map = IdMapDomain.join astate1.id_map astate2.id_map in
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{ access_tree; id_map; }
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let widen ~prev ~next ~num_iters =
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if prev == next
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then prev
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else
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let access_tree =
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TaintDomain.widen ~prev:prev.access_tree ~next:next.access_tree ~num_iters in
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let id_map = IdMapDomain.widen ~prev:prev.id_map ~next:next.id_map ~num_iters in
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{ access_tree; id_map; }
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let pp fmt { access_tree; id_map; } =
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F.fprintf fmt "(%a, %a)" TaintDomain.pp access_tree IdMapDomain.pp id_map
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end
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let is_global (var, _) = match var with
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| Var.ProgramVar pvar -> Pvar.is_global pvar
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| Var.LogicalVar _ -> false
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module TransferFunctions (CFG : ProcCfg.S) = struct
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module CFG = CFG
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module Domain = Domain
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(** map from formals to their position *)
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type formal_map = int AccessPath.BaseMap.t
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type extras = formal_map
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let is_formal base formal_map =
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AccessPath.BaseMap.mem base formal_map
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let is_rooted_in_environment ap formal_map =
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let root, _ = AccessPath.extract ap in
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is_formal root formal_map || is_global root
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let resolve_id id_map id =
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try Some (IdMapDomain.find id id_map)
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with Not_found -> None
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(* get the node associated with [access_path] in [access_tree] *)
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let access_path_get_node access_path access_tree (proc_data : formal_map ProcData.t) loc =
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match TaintDomain.get_node access_path access_tree with
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| Some _ as node_opt ->
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node_opt
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| None when is_rooted_in_environment access_path proc_data.extras ->
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let call_site = CallSite.make (Cfg.Procdesc.get_proc_name proc_data.ProcData.pdesc) loc in
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let trace =
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TraceDomain.of_source (TraceDomain.Source.make_footprint access_path call_site) in
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Some (TaintDomain.make_normal_leaf trace)
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| None ->
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None
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(* get the trace associated with [access_path] in [access_tree]. *)
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let access_path_get_trace access_path access_tree proc_data loc =
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match access_path_get_node access_path access_tree proc_data loc with
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| Some (trace, _) -> trace
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| None -> TraceDomain.initial
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(* get the node associated with [exp] in [access_tree] *)
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let exp_get_node exp typ { Domain.access_tree; id_map; } proc_data loc =
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let f_resolve_id = resolve_id id_map in
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match AccessPath.of_lhs_exp exp typ ~f_resolve_id with
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| Some access_path ->
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access_path_get_node (AccessPath.Exact access_path) access_tree proc_data loc
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| None ->
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(* can't make an access path from [exp] *)
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None
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let analyze_assignment lhs_access_path rhs_exp rhs_typ astate proc_data loc =
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let rhs_node =
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match exp_get_node rhs_exp rhs_typ astate proc_data loc with
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| Some node -> node
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| None -> TaintDomain.empty_node in
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let access_tree = TaintDomain.add_node lhs_access_path rhs_node astate.Domain.access_tree in
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{ astate with Domain.access_tree; }
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let analyze_id_assignment lhs_id rhs_exp rhs_typ ({ Domain.id_map; } as astate) =
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let f_resolve_id = resolve_id id_map in
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match AccessPath.of_lhs_exp rhs_exp rhs_typ ~f_resolve_id with
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| Some rhs_access_path ->
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let id_map' = IdMapDomain.add lhs_id rhs_access_path id_map in
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{ astate with Domain.id_map = id_map'; }
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| None ->
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astate
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let add_source source ret_id ret_typ access_tree =
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let trace = TraceDomain.of_source source in
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let id_ap = AccessPath.Exact (AccessPath.of_id ret_id ret_typ) in
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TaintDomain.add_trace id_ap trace access_tree
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(* log any reportable source-sink flows in [trace] and remove logged sinks from the trace *)
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let report_and_filter_trace trace callee_site (proc_data : formal_map ProcData.t) =
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let trace_of_pname pname =
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match Summary.read_summary proc_data.tenv proc_data.pdesc pname with
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| Some summary ->
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let join_output_trace acc { QuandarySummary.output_trace; } =
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TraceDomain.join (TaintSpec.of_summary_trace output_trace) acc in
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IList.fold_left join_output_trace TraceDomain.initial summary
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| None ->
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TraceDomain.initial in
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let caller_pname = Cfg.Procdesc.get_proc_name proc_data.pdesc in
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let expand_trace = false in
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match TraceDomain.get_reportable_traces trace caller_pname ~expand_trace ~trace_of_pname with
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| [] ->
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trace
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| reportable_trace_strs ->
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let reported_sinks =
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IList.map
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(fun (_, sink, trace_str) ->
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let msg = Localise.to_string Localise.quandary_taint_error in
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let exn = Exceptions.Checkers (msg, Localise.verbatim_desc trace_str) in
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Reporting.log_error caller_pname ~loc:(CallSite.loc callee_site) exn;
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sink)
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reportable_trace_strs in
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(* got new source -> sink flow. report it, but don't add the sink to the trace. if we do,
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we will double-report later on. *)
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TraceDomain.filter_sinks trace reported_sinks
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let add_sinks sinks actuals ({ Domain.access_tree; id_map; } as astate) proc_data callee_site =
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let f_resolve_id = resolve_id id_map in
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(* add [sink] to the trace associated with the [formal_num]th actual *)
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let add_sink_to_actual access_tree_acc (sink_param : TraceDomain.Sink.t Sink.parameter) =
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let actual_exp, actual_typ = IList.nth actuals sink_param.index in
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match AccessPath.of_lhs_exp actual_exp actual_typ ~f_resolve_id with
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| Some actual_ap_raw ->
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let actual_ap =
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let is_array_typ = match actual_typ with
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| Typ.Tptr (Tarray _, _) (* T* [] (Java-style) *)
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| Tptr (Tptr _, _) (* T** (C/C++ style 1) *)
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| Tarray _ (* T[] C/C++ style 2 *) ->
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true
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| _ ->
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false in
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(* conisder any sources that are reachable from an array *)
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if sink_param.report_reachable || is_array_typ
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then AccessPath.Abstracted actual_ap_raw
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else AccessPath.Exact actual_ap_raw in
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begin
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match access_path_get_node
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actual_ap access_tree_acc proc_data (CallSite.loc callee_site) with
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| Some (actual_trace, _) ->
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(* add callee_pname to actual trace as a sink *)
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let actual_trace' =
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report_and_filter_trace
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(TraceDomain.add_sink sink_param.sink actual_trace)
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callee_site
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proc_data in
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TaintDomain.add_trace actual_ap actual_trace' access_tree_acc
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| None ->
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access_tree_acc
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end
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| None ->
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access_tree_acc in
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let access_tree' = IList.fold_left add_sink_to_actual access_tree sinks in
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{ astate with Domain.access_tree = access_tree'; }
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let apply_summary
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ret_id
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actuals
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summary
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(astate_in : Domain.astate)
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proc_data
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callee_site =
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let callee_loc = CallSite.loc callee_site in
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let apply_return ret_ap = function
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| Some (ret_id, _) -> AccessPath.with_base_var (Var.of_id ret_id) ret_ap
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| None -> failwith "Have summary for retval, but no ret id to bind it to!" in
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let get_actual_ap_trace formal_num formal_ap access_tree =
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let get_actual_ap formal_num =
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let f_resolve_id = resolve_id astate_in.id_map in
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let actual_exp, actual_typ =
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try IList.nth actuals formal_num
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with Failure _ -> failwithf "Bad formal number %d" formal_num in
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AccessPath.of_lhs_exp actual_exp actual_typ ~f_resolve_id in
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let project ~formal_ap ~actual_ap =
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let projected_ap = AccessPath.append actual_ap (snd (AccessPath.extract formal_ap)) in
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if AccessPath.is_exact formal_ap
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then AccessPath.Exact projected_ap
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else AccessPath.Abstracted projected_ap in
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match get_actual_ap formal_num with
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| Some actual_ap ->
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let projected_ap = project ~formal_ap ~actual_ap in
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let projected_trace =
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access_path_get_trace projected_ap access_tree proc_data callee_loc in
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Some (projected_ap, projected_trace)
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| None ->
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None in
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let apply_one access_tree (in_out_summary : QuandarySummary.in_out_summary) =
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let in_trace = match in_out_summary.input with
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| In_empty ->
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TraceDomain.initial
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| In_formal (formal_num, formal_ap) ->
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begin
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match get_actual_ap_trace formal_num formal_ap access_tree with
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| Some (_, actual_trace) -> actual_trace
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| None -> TraceDomain.initial
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end
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| In_global global_ap ->
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access_path_get_trace global_ap access_tree proc_data callee_loc in
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let caller_ap_trace_opt =
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match in_out_summary.output with
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| Out_return ret_ap ->
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let caller_ret_ap = apply_return ret_ap ret_id in
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let ret_trace =
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access_path_get_trace caller_ret_ap access_tree proc_data callee_loc in
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Some (caller_ret_ap, ret_trace)
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| Out_formal (formal_num, formal_ap) ->
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get_actual_ap_trace formal_num formal_ap access_tree
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| Out_global global_ap ->
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let global_trace = access_path_get_trace global_ap access_tree proc_data callee_loc in
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Some (global_ap, global_trace) in
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match caller_ap_trace_opt with
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| Some (caller_ap, caller_trace) ->
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let output_trace = TaintSpec.of_summary_trace in_out_summary.output_trace in
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let appended_trace = TraceDomain.append in_trace output_trace callee_site in
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let joined_trace = TraceDomain.join caller_trace appended_trace in
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let filtered_trace = report_and_filter_trace joined_trace callee_site proc_data in
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TaintDomain.add_trace caller_ap filtered_trace access_tree
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| None ->
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access_tree in
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let access_tree = IList.fold_left apply_one astate_in.access_tree summary in
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{ astate_in with access_tree; }
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let exec_instr (astate : Domain.astate) (proc_data : formal_map ProcData.t) _ instr =
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let f_resolve_id = resolve_id astate.id_map in
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match instr with
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| Sil.Load (lhs_id, rhs_exp, rhs_typ, _) ->
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analyze_id_assignment (Var.of_id lhs_id) rhs_exp rhs_typ astate
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| Sil.Store (Exp.Lvar lhs_pvar, lhs_typ, rhs_exp, _) when Pvar.is_frontend_tmp lhs_pvar ->
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analyze_id_assignment (Var.of_pvar lhs_pvar) rhs_exp lhs_typ astate
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| Sil.Store (Exp.Lvar lhs_pvar, _, Exp.Exn _, _) when Pvar.is_return lhs_pvar ->
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(* the Java frontend translates `throw Exception` as `return Exception`, which is a bit
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wonky. this tranlsation causes problems for us in computing a summary when an
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exception is "returned" from a void function. skip code like this for now
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(fix via t14159157 later *)
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astate
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| Sil.Store (lhs_exp, lhs_typ, rhs_exp, loc) ->
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let lhs_access_path =
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match AccessPath.of_lhs_exp lhs_exp lhs_typ ~f_resolve_id with
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| Some access_path ->
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access_path
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| None ->
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failwithf
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"Assignment to unexpected lhs expression %a in proc %a at loc %a"
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Exp.pp lhs_exp
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Procname.pp (Cfg.Procdesc.get_proc_name (proc_data.pdesc))
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Location.pp loc in
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let astate' =
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analyze_assignment
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(AccessPath.Exact lhs_access_path) rhs_exp lhs_typ astate proc_data loc in
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begin
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(* direct `exp = id` assignments are treated specially; we update the id map too. this
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is so future reads of `exp` will get the subtree associated with `id` (needed to
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handle the `id = foo(); exp = id case` and similar). *)
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match rhs_exp with
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| Exp.Var rhs_id ->
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let existing_accesses =
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try snd (IdMapDomain.find (Var.of_id rhs_id) astate'.Domain.id_map)
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with Not_found -> [] in
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let lhs_ap' = AccessPath.append lhs_access_path existing_accesses in
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let id_map' = IdMapDomain.add (Var.of_id rhs_id) lhs_ap' astate'.Domain.id_map in
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{ astate' with Domain.id_map = id_map'; }
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| _ ->
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astate'
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end
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| Sil.Call (Some (ret_id, _), Const (Cfun callee_pname), args, loc, _)
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when BuiltinDecl.is_declared callee_pname ->
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if Procname.equal callee_pname BuiltinDecl.__cast
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then
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match args with
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| (cast_target, cast_typ) :: _ ->
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analyze_id_assignment (Var.of_id ret_id) cast_target cast_typ astate
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| _ ->
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failwithf
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"Unexpected cast %a in procedure %a at line %a"
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(Sil.pp_instr pe_text) instr
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Procname.pp (Cfg.Procdesc.get_proc_name (proc_data.pdesc))
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Location.pp loc
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else
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astate
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| Sil.Call (ret, Const (Cfun called_pname), actuals, callee_loc, call_flags) ->
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let analyze_call astate_acc callee_pname =
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let call_site = CallSite.make callee_pname callee_loc in
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let sinks = TraceDomain.Sink.get call_site actuals in
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let astate_with_sink = match sinks with
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| [] -> astate
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| sinks -> add_sinks sinks actuals astate proc_data call_site in
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let source = TraceDomain.Source.get call_site in
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let astate_with_source =
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match source, ret with
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| Some source, Some (ret_id, ret_typ) ->
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let access_tree = add_source source ret_id ret_typ astate_with_sink.access_tree in
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{ astate_with_sink with access_tree; }
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| Some _, None ->
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failwithf
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"%a is marked as a source, but has no return value" Procname.pp callee_pname
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| None, _ ->
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astate_with_sink in
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let astate_with_summary =
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if sinks <> [] || Option.is_some source
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then
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(* don't use a summary for a procedure that is a direct source or sink *)
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astate_with_source
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else
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let summary =
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match Summary.read_summary proc_data.tenv proc_data.pdesc callee_pname with
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| Some summary -> summary
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| None -> TaintSpec.handle_unknown_call call_site (Option.map snd ret) actuals in
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apply_summary ret actuals summary astate_with_source proc_data call_site in
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Domain.join astate_acc astate_with_summary in
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(* highly polymorphic call sites stress reactive mode too much by using too much memory.
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here, we choose an arbitrary call limit that allows us to finish the analysis in
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practice. this is obviously unsound; will try to remove in the future. *)
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let max_calls = 10 in
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let targets =
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if IList.length call_flags.cf_targets <= max_calls
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then
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called_pname :: call_flags.cf_targets
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else
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begin
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L.out "Skipping highly polymorphic call site for %a@." Procname.pp called_pname;
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[called_pname]
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end in
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(* for each possible target of the call, apply the summary. join all results together *)
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IList.fold_left analyze_call Domain.initial targets
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| Sil.Call _ ->
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failwith "Unimp: non-pname call expressions"
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| Sil.Nullify (pvar, _) ->
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let id_map = IdMapDomain.remove (Var.of_pvar pvar) astate.id_map in
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{ astate with id_map; }
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| Sil.Remove_temps (ids, _) ->
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let id_map =
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IList.fold_left
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(fun acc id -> IdMapDomain.remove (Var.of_id id) acc)
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astate.id_map
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ids in
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{ astate with id_map; }
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| Sil.Prune _ | Abstract _ | Declare_locals _ ->
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astate
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end
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module Analyzer = AbstractInterpreter.Make
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(ProcCfg.Exceptional)
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(Scheduler.ReversePostorder)
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(TransferFunctions)
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|
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(** grab footprint traces in [access_tree] and make them into inputs for the summary. for each
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trace Footprint(T_out, a.b.c) associated with access path x.z.y, we will produce a summary of
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the form (x.z.y, T_in) => (T_in + T_out, a.b.c) *)
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let make_summary formal_map access_tree =
|
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let is_return (var, _) = match var with
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| Var.ProgramVar pvar -> Pvar.is_return pvar
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| Var.LogicalVar _ -> false in
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let add_summaries_for_trace summary_acc access_path trace =
|
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let summary_trace = TaintSpec.to_summary_trace trace in
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let output_opt =
|
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let base = fst (AccessPath.extract access_path) in
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match AccessPath.BaseMap.find base formal_map with
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| index ->
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Some (QuandarySummary.make_formal_output index access_path)
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| exception Not_found ->
|
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if is_return base
|
|
then Some (QuandarySummary.make_return_output access_path)
|
|
else if is_global base
|
|
then Some (QuandarySummary.make_global_output access_path)
|
|
else None in
|
|
|
|
let add_summary_for_source source acc =
|
|
match TraceDomain.Source.get_footprint_access_path source with
|
|
| Some footprint_ap ->
|
|
let footprint_ap_base = fst (AccessPath.extract footprint_ap) in
|
|
begin
|
|
match AccessPath.BaseMap.find footprint_ap_base formal_map with
|
|
| formal_index ->
|
|
let input = QuandarySummary.make_formal_input formal_index footprint_ap in
|
|
begin
|
|
match output_opt with
|
|
| Some output ->
|
|
(QuandarySummary.make_in_out_summary input output summary_trace) :: acc
|
|
| None ->
|
|
if not (TraceDomain.Sinks.is_empty (TraceDomain.sinks trace))
|
|
then
|
|
let output =
|
|
QuandarySummary.make_formal_output formal_index footprint_ap in
|
|
(QuandarySummary.make_in_out_summary input output summary_trace) :: acc
|
|
else
|
|
(* output access path is same as input access path and there were no sinks
|
|
in this function. summary would be the identity function *)
|
|
acc
|
|
end
|
|
| exception Not_found ->
|
|
if is_global footprint_ap_base
|
|
then
|
|
let input = QuandarySummary.make_global_input footprint_ap in
|
|
let output =
|
|
match output_opt with
|
|
| Some output -> output
|
|
| None -> QuandarySummary.make_global_output footprint_ap in
|
|
(QuandarySummary.make_in_out_summary input output summary_trace) :: acc
|
|
else
|
|
failwithf
|
|
"Couldn't find formal number for %a@." AccessPath.pp_base footprint_ap_base
|
|
end
|
|
| None ->
|
|
begin
|
|
match output_opt with
|
|
| Some output ->
|
|
let summary =
|
|
QuandarySummary.make_in_out_summary
|
|
QuandarySummary.empty_input output summary_trace in
|
|
summary :: acc
|
|
| None ->
|
|
acc
|
|
end in
|
|
|
|
TraceDomain.Source.Set.fold add_summary_for_source (TraceDomain.sources trace) summary_acc in
|
|
TaintDomain.fold add_summaries_for_trace access_tree []
|
|
|
|
let dummy_cg = Cg.create None
|
|
|
|
let checker { Callbacks.get_proc_desc; proc_name; proc_desc; tenv; } =
|
|
let analyze_ondemand _ pdesc =
|
|
let make_formal_access_paths pdesc =
|
|
let pname = Cfg.Procdesc.get_proc_name pdesc in
|
|
let attrs = Cfg.Procdesc.get_attributes pdesc in
|
|
let formals_with_nums =
|
|
IList.mapi
|
|
(fun index (name, typ) ->
|
|
let pvar = Pvar.mk name pname in
|
|
AccessPath.base_of_pvar pvar typ, index)
|
|
attrs.ProcAttributes.formals in
|
|
IList.fold_left
|
|
(fun formal_map (base, index) -> AccessPath.BaseMap.add base index formal_map)
|
|
AccessPath.BaseMap.empty
|
|
formals_with_nums in
|
|
|
|
Preanal.doit ~handle_dynamic_dispatch:true pdesc dummy_cg tenv;
|
|
let formals = make_formal_access_paths pdesc in
|
|
let proc_data = ProcData.make pdesc tenv formals in
|
|
match Analyzer.compute_post proc_data with
|
|
| Some { access_tree; } ->
|
|
let summary = make_summary formals access_tree in
|
|
Summary.write_summary (Cfg.Procdesc.get_proc_name pdesc) summary;
|
|
| None ->
|
|
if Cfg.Node.get_succs (Cfg.Procdesc.get_start_node pdesc) = []
|
|
then ()
|
|
else failwith "Couldn't compute post" in
|
|
let callbacks =
|
|
{
|
|
Ondemand.analyze_ondemand;
|
|
get_proc_desc;
|
|
} in
|
|
if Ondemand.procedure_should_be_analyzed proc_name
|
|
then
|
|
begin
|
|
Ondemand.set_callbacks callbacks;
|
|
analyze_ondemand DB.source_file_empty proc_desc;
|
|
Ondemand.unset_callbacks ();
|
|
end
|
|
|
|
end
|