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[inferbo] Modeled functions may also generate proof obligations

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Summary:
A modeled function is not only an evaluator but also a checker, at least in Inferbo where both things happen in two passes.
This diff just prepares for it without generating new alarms.

Reviewed By: jvillard

Differential Revision: D6373051

fbshipit-source-id: 264696f
master
Mehdi Bouaziz 7 years ago committed by Facebook Github Bot
parent 1a4316065a
commit cb363d8dcb
3 changed files with 111 additions and 72 deletions
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4
infer/src/bufferoverrun/bufferOverrunChecker.ml
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@ -265,8 +265,8 @@ module TransferFunctions (CFG : ProcCfg.S) = struct
Sem.prune exp mem
| Call (ret, Const Cfun callee_pname, params, location, _) -> (
match Models.dispatcher callee_pname params with
| Some model ->
model callee_pname ret node location mem
| Some {Models.exec} ->
exec callee_pname ret node location mem
| None ->
match Summary.read_summary pdesc callee_pname with
| Some summary ->

175
infer/src/bufferoverrun/bufferOverrunModels.ml
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@ -12,26 +12,24 @@ open AbsLoc
open! AbstractDomain.Types
module L = Logging
module Dom = BufferOverrunDomain
module PO = BufferOverrunProofObligations
module Trace = BufferOverrunTrace
module TraceSet = Trace.Set
module Make (CFG : ProcCfg.S) = struct
module Sem = BufferOverrunSemantics.Make (CFG)
type model_fun =
type exec_fun =
Typ.Procname.t -> (Ident.t * Typ.t) option -> CFG.node -> Location.t -> Dom.Mem.astate
-> Dom.Mem.astate
let set_uninitialized node (typ: Typ.t) ploc mem =
match typ.desc with
| Tint _ | Tfloat _ ->
Dom.Mem.weak_update_heap ploc Dom.Val.Itv.top mem
| _ ->
L.(debug BufferOverrun Verbose)
"/!\\ Do not know how to uninitialize type %a at %a@\n" (Typ.pp Pp.text) typ Location.pp
(CFG.loc node) ;
mem
type check_fun =
Typ.Procname.t -> CFG.node -> Location.t -> Dom.Mem.astate -> PO.ConditionSet.t
-> PO.ConditionSet.t
type model = {exec: exec_fun; check: check_fun}
let no_check _pname _node _location _mem cond_set = cond_set
(* NOTE: heuristic *)
let get_malloc_info : Exp.t -> Typ.t * Int.t option * Exp.t = function
@ -44,45 +42,71 @@ module Make (CFG : ProcCfg.S) = struct
(Typ.mk (Typ.Tint Typ.IChar), Some 1, x)
let model_malloc (size_exp, _) pname ret node location mem =
match ret with
| Some (id, _) ->
let typ, stride, length0 = get_malloc_info size_exp in
let length = Sem.eval length0 mem in
let traces = TraceSet.add_elem (Trace.ArrDecl location) (Dom.Val.get_traces length) in
let v =
Sem.eval_array_alloc pname node typ ?stride Itv.zero (Dom.Val.get_itv length) 0 1
|> Dom.Val.set_traces traces
in
mem |> Dom.Mem.add_stack (Loc.of_id id) v
|> set_uninitialized node typ (Dom.Val.get_array_locs v)
| _ ->
L.(debug BufferOverrun Verbose)
"/!\\ Do not know where to model malloc at %a@\n" Location.pp (CFG.loc node) ;
mem
let check_alloc_size size_exp pname _node location mem cond_set =
let _, _, length0 = get_malloc_info size_exp in
let v_length = Sem.eval length0 mem in
let traces = Dom.Val.get_traces v_length in
let length = Dom.Val.get_itv v_length in
PO.ConditionSet.add_alloc_size pname location length traces cond_set
let model_realloc size_arg pname ret node location mem =
model_malloc size_arg pname ret node location mem
let model_min (e1, _) (e2, _) _pname ret _node _location mem =
match ret with
| Some (id, _) ->
let i1 = Sem.eval e1 mem |> Dom.Val.get_itv in
let i2 = Sem.eval e2 mem |> Dom.Val.get_itv in
let v = Itv.min_sem i1 i2 |> Dom.Val.of_itv in
mem |> Dom.Mem.add_stack (Loc.of_id id) v
let set_uninitialized node (typ: Typ.t) ploc mem =
match typ.desc with
| Tint _ | Tfloat _ ->
Dom.Mem.weak_update_heap ploc Dom.Val.Itv.top mem
| _ ->
L.(debug BufferOverrun Verbose)
"/!\\ Do not know how to uninitialize type %a at %a@\n" (Typ.pp Pp.text) typ Location.pp
(CFG.loc node) ;
mem
let model_set_size (e1, _) (e2, _) _pname _ret _node _location mem =
let locs = Sem.eval_locs e1 mem |> Dom.Val.get_pow_loc in
let size = Sem.eval e2 mem |> Dom.Val.get_itv in
let arr = Dom.Mem.find_heap_set locs mem in
let arr = Dom.Val.set_array_size size arr in
Dom.Mem.strong_update_heap locs arr mem
let malloc (size_exp, _) =
let exec pname ret node location mem =
match ret with
| Some (id, _) ->
let typ, stride, length0 = get_malloc_info size_exp in
let length = Sem.eval length0 mem in
let traces = TraceSet.add_elem (Trace.ArrDecl location) (Dom.Val.get_traces length) in
let v =
Sem.eval_array_alloc pname node typ ?stride Itv.zero (Dom.Val.get_itv length) 0 1
|> Dom.Val.set_traces traces
in
mem |> Dom.Mem.add_stack (Loc.of_id id) v
|> set_uninitialized node typ (Dom.Val.get_array_locs v)
| _ ->
L.(debug BufferOverrun Verbose)
"/!\\ Do not know where to model malloc at %a@\n" Location.pp (CFG.loc node) ;
mem
and check = check_alloc_size size_exp in
{exec; check}
let realloc = malloc
let inferbo_min (e1, _) (e2, _) =
let exec _pname ret _node _location mem =
match ret with
| Some (id, _) ->
let i1 = Sem.eval e1 mem |> Dom.Val.get_itv in
let i2 = Sem.eval e2 mem |> Dom.Val.get_itv in
let v = Itv.min_sem i1 i2 |> Dom.Val.of_itv in
mem |> Dom.Mem.add_stack (Loc.of_id id) v
| _ ->
mem
in
{exec; check= no_check}
let inferbo_set_size (e1, _) (e2, _) =
let exec _pname _ret _node _location mem =
let locs = Sem.eval_locs e1 mem |> Dom.Val.get_pow_loc in
let size = Sem.eval e2 mem |> Dom.Val.get_itv in
let arr = Dom.Mem.find_heap_set locs mem in
let arr = Dom.Val.set_array_size size arr in
Dom.Mem.strong_update_heap locs arr mem
and check = check_alloc_size e2 in
{exec; check}
let model_by_value value _pname ret _node _location mem =
@ -95,39 +119,50 @@ module Make (CFG : ProcCfg.S) = struct
mem
let model_bottom _pname _ret _node _location _mem = Bottom
let by_value value = {exec= model_by_value value; check= no_check}
let model_infer_print (e, _) _pname _ret _node location mem =
L.(debug BufferOverrun Medium)
"@[<v>=== Infer Print === at %a@,%a@]%!" Location.pp location Dom.Val.pp (Sem.eval e mem) ;
mem
let bottom =
let exec _pname _ret _node _location _mem = Bottom in
{exec; check= no_check}
let model_infer_set_array_length array (length_exp, _) pname _ret node _location mem =
match array with
| Exp.Lvar array_pvar, {Typ.desc= Typ.Tarray (typ, _, stride0)} ->
let length = Sem.eval length_exp mem |> Dom.Val.get_itv in
let stride = Option.map ~f:IntLit.to_int stride0 in
let v = Sem.eval_array_alloc pname node typ ?stride Itv.zero length 0 1 in
mem |> Dom.Mem.add_stack (Loc.of_pvar array_pvar) v
|> set_uninitialized node typ (Dom.Val.get_array_locs v)
| _ ->
L.(die InternalError) "Unexpected type of first argument for __set_array_length()"
let infer_print (e, _) =
let exec _pname _ret _node location mem =
L.(debug BufferOverrun Medium)
"@[<v>=== Infer Print === at %a@,%a@]%!" Location.pp location Dom.Val.pp (Sem.eval e mem) ;
mem
in
{exec; check= no_check}
let set_array_length array (length_exp, _) =
let exec pname _ret node _location mem =
match array with
| Exp.Lvar array_pvar, {Typ.desc= Typ.Tarray (typ, _, stride0)} ->
let length = Sem.eval length_exp mem |> Dom.Val.get_itv in
let stride = Option.map ~f:IntLit.to_int stride0 in
let v = Sem.eval_array_alloc pname node typ ?stride Itv.zero length 0 1 in
mem |> Dom.Mem.add_stack (Loc.of_pvar array_pvar) v
|> set_uninitialized node typ (Dom.Val.get_array_locs v)
| _ ->
L.(die InternalError) "Unexpected type of first argument for __set_array_length()"
and check = check_alloc_size length_exp in
{exec; check}
let dispatcher : model_fun ProcnameDispatcher.dispatcher =
let dispatcher : model ProcnameDispatcher.dispatcher =
let open ProcnameDispatcher in
make_dispatcher
[ -"__inferbo_min" <>$ capt_arg $+ capt_arg $!--> model_min
; -"__inferbo_set_size" <>$ capt_arg $+ capt_arg $!--> model_set_size
; -"__exit" <>--> model_bottom
; -"exit" <>--> model_bottom
; -"fgetc" <>--> model_by_value Dom.Val.Itv.m1_255
; -"infer_print" <>$ capt_arg $!--> model_infer_print
; -"malloc" <>$ capt_arg $+...$--> model_malloc
; -"__new_array" <>$ capt_arg $+...$--> model_malloc
; -"realloc" <>$ any_arg $+ capt_arg $+...$--> model_realloc
; -"__set_array_length" <>$ capt_arg $+ capt_arg $!--> model_infer_set_array_length
; -"strlen" <>--> model_by_value Dom.Val.Itv.nat ]
[ -"__inferbo_min" <>$ capt_arg $+ capt_arg $!--> inferbo_min
; -"__inferbo_set_size" <>$ capt_arg $+ capt_arg $!--> inferbo_set_size
; -"__exit" <>--> bottom
; -"exit" <>--> bottom
; -"fgetc" <>--> by_value Dom.Val.Itv.m1_255
; -"infer_print" <>$ capt_arg $!--> infer_print
; -"malloc" <>$ capt_arg $+...$--> malloc
; -"__new_array" <>$ capt_arg $+...$--> malloc
; -"realloc" <>$ any_arg $+ capt_arg $+...$--> realloc
; -"__set_array_length" <>$ capt_arg $+ capt_arg $!--> set_array_length
; -"strlen" <>--> by_value Dom.Val.Itv.nat ]
end

4
infer/src/bufferoverrun/bufferOverrunProofObligations.ml
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@ -283,6 +283,10 @@ module ConditionSet = struct
join [cwt] condset
let add_alloc_size _pname _location _size _val_traces _condset =
L.(die InternalError) "Not implemented add_alloc_size"
let subst condset (bound_map, trace_map) caller_pname callee_pname location =
let subst_add_cwt condset cwt =
match Condition.get_symbols cwt.cond with

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