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simple memcpy/strlen bug #7

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simple memcpy/strlen bug #7

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c8e4d94
memcpy bug
Sep 7, 2021
818bafd
fix strlen
Sep 19, 2021
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2 changes: 1 addition & 1 deletion src/instance/itvAnalysis.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -128,7 +128,7 @@ let inspect_aexp_bo : InterCfg.node -> AlarmExp.t -> Mem.t -> query list -> quer
| Memmove (e1, e2, e3, loc) ->
let v1 = ItvSem.eval (InterCfg.Node.get_pid node) e1 mem in
let v2 = ItvSem.eval (InterCfg.Node.get_pid node) e2 mem in
let e3_1 = Cil.BinOp (Cil.MinusA, e3, Cil.mone, Cil.intType) in
let e3_1 = Cil.BinOp (Cil.MinusA, e3, Cil.one, Cil.intType) in
let v3 = ItvSem.eval (InterCfg.Node.get_pid node) e3_1 mem in
let lst1 = check_bo v1 (Some v3) in
let lst2 = check_bo v2 (Some v3) in
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3 changes: 2 additions & 1 deletion src/semantics/itvSem.ml
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Expand Up @@ -393,7 +393,8 @@ let model_strlen mode spec pid (lvo, exps) (mem, global) =
| (Some lv, str::_) ->
let str_val = eval ~spec pid str mem in
let null_pos = ArrayBlk.nullof (ItvDom.Val.array_of_val str_val) in
let v = Val.of_itv (Itv.meet Itv.nat null_pos) in
let offset = ArrayBlk.offsetof (ItvDom.Val.array_of_val str_val) in
let v = Val.of_itv (Itv.meet Itv.nat (Itv.minus null_pos offset)) in
(update mode spec global (eval_lv ~spec pid lv mem) v mem, global)
| _ -> (mem,global)

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