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Dataflow: Sync.
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7 files changed

+238
-70
lines changed

7 files changed

+238
-70
lines changed

‎cpp/ql/lib/semmle/code/cpp/dataflow/internal/DataFlowImpl.qll

Lines changed: 34 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -2677,7 +2677,7 @@ module Impl<FullStateConfigSig Config> {
26772677
TSummaryCtxSome(ParamNodeEx p, FlowState state, DataFlowType t, AccessPath ap) {
26782678
exists(AccessPathApprox apa | ap.getApprox() = apa |
26792679
Stage5::parameterMayFlowThrough(p, apa) and
2680-
Stage5::fwdFlow(p, state, _, _, _, _, t, apa, _) and
2680+
Stage5::fwdFlow(p, state, _, _, Option<DataFlowType>::some(t), _, _, apa, _) and
26812681
Stage5::revFlow(p, state, _)
26822682
)
26832683
}
@@ -4008,7 +4008,7 @@ module Impl<FullStateConfigSig Config> {
40084008
ap = TPartialNil() and
40094009
exists(explorationLimit())
40104010
or
4011-
partialPathNodeMk0(node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4011+
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
40124012
distSrc(node.getEnclosingCallable()) <= explorationLimit()
40134013
} or
40144014
TPartialPathNodeRev(
@@ -4034,21 +4034,40 @@ module Impl<FullStateConfigSig Config> {
40344034
}
40354035

40364036
pragma[nomagic]
4037-
private predicate partialPathNodeMk0(
4038-
NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1, TSummaryCtx2 sc2,
4039-
TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4037+
private predicate partialPathStep(
4038+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4039+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4040+
) {
4041+
partialPathStep1(mid, node, state, cc, sc1, sc2, sc3, sc4, _, t, ap)
4042+
}
4043+
4044+
pragma[nomagic]
4045+
private predicate partialPathStep1(
4046+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4047+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t0, DataFlowType t,
4048+
PartialAccessPath ap
40404049
) {
4041-
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4050+
partialPathStep0(mid, node, state, cc, sc1, sc2, sc3, sc4, t0, ap) and
40424051
not fullBarrier(node) and
40434052
not stateBarrier(node, state) and
40444053
not clearsContentEx(node, ap.getHead()) and
40454054
(
40464055
notExpectsContent(node) or
40474056
expectsContentEx(node, ap.getHead())
40484057
) and
4049-
if node.asNode() instanceof CastingNode
4050-
then compatibleTypes(node.getDataFlowType(), t)
4051-
else any()
4058+
if castingNodeEx(node)
4059+
then
4060+
exists(DataFlowType nt | nt = node.getDataFlowType() |
4061+
if typeStrongerThan(nt, t0) then t = nt else (compatibleTypes(nt, t0) and t = t0)
4062+
)
4063+
else t = t0
4064+
}
4065+
4066+
pragma[nomagic]
4067+
private predicate partialPathTypeStrengthen(
4068+
DataFlowType t0, PartialAccessPath ap, DataFlowType t
4069+
) {
4070+
partialPathStep1(_, _, _, _, _, _, _, _, t0, t, ap) and t0 != t
40524071
}
40534072

40544073
/**
@@ -4227,7 +4246,7 @@ module Impl<FullStateConfigSig Config> {
42274246
}
42284247
}
42294248

4230-
private predicate partialPathStep(
4249+
private predicate partialPathStep0(
42314250
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
42324251
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
42334252
) {
@@ -4353,6 +4372,11 @@ module Impl<FullStateConfigSig Config> {
43534372
DataFlowType t1, PartialAccessPath ap1, Content c, DataFlowType t2, PartialAccessPath ap2
43544373
) {
43554374
partialPathStoreStep(_, t1, ap1, c, _, t2, ap2)
4375+
or
4376+
exists(DataFlowType t0 |
4377+
partialPathTypeStrengthen(t0, ap2, t2) and
4378+
apConsFwd(t1, ap1, c, t0, ap2)
4379+
)
43564380
}
43574381

43584382
pragma[nomagic]

‎cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowImpl.qll

Lines changed: 34 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -2677,7 +2677,7 @@ module Impl<FullStateConfigSig Config> {
26772677
TSummaryCtxSome(ParamNodeEx p, FlowState state, DataFlowType t, AccessPath ap) {
26782678
exists(AccessPathApprox apa | ap.getApprox() = apa |
26792679
Stage5::parameterMayFlowThrough(p, apa) and
2680-
Stage5::fwdFlow(p, state, _, _, _, _, t, apa, _) and
2680+
Stage5::fwdFlow(p, state, _, _, Option<DataFlowType>::some(t), _, _, apa, _) and
26812681
Stage5::revFlow(p, state, _)
26822682
)
26832683
}
@@ -4008,7 +4008,7 @@ module Impl<FullStateConfigSig Config> {
40084008
ap = TPartialNil() and
40094009
exists(explorationLimit())
40104010
or
4011-
partialPathNodeMk0(node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4011+
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
40124012
distSrc(node.getEnclosingCallable()) <= explorationLimit()
40134013
} or
40144014
TPartialPathNodeRev(
@@ -4034,21 +4034,40 @@ module Impl<FullStateConfigSig Config> {
40344034
}
40354035

40364036
pragma[nomagic]
4037-
private predicate partialPathNodeMk0(
4038-
NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1, TSummaryCtx2 sc2,
4039-
TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4037+
private predicate partialPathStep(
4038+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4039+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4040+
) {
4041+
partialPathStep1(mid, node, state, cc, sc1, sc2, sc3, sc4, _, t, ap)
4042+
}
4043+
4044+
pragma[nomagic]
4045+
private predicate partialPathStep1(
4046+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4047+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t0, DataFlowType t,
4048+
PartialAccessPath ap
40404049
) {
4041-
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4050+
partialPathStep0(mid, node, state, cc, sc1, sc2, sc3, sc4, t0, ap) and
40424051
not fullBarrier(node) and
40434052
not stateBarrier(node, state) and
40444053
not clearsContentEx(node, ap.getHead()) and
40454054
(
40464055
notExpectsContent(node) or
40474056
expectsContentEx(node, ap.getHead())
40484057
) and
4049-
if node.asNode() instanceof CastingNode
4050-
then compatibleTypes(node.getDataFlowType(), t)
4051-
else any()
4058+
if castingNodeEx(node)
4059+
then
4060+
exists(DataFlowType nt | nt = node.getDataFlowType() |
4061+
if typeStrongerThan(nt, t0) then t = nt else (compatibleTypes(nt, t0) and t = t0)
4062+
)
4063+
else t = t0
4064+
}
4065+
4066+
pragma[nomagic]
4067+
private predicate partialPathTypeStrengthen(
4068+
DataFlowType t0, PartialAccessPath ap, DataFlowType t
4069+
) {
4070+
partialPathStep1(_, _, _, _, _, _, _, _, t0, t, ap) and t0 != t
40524071
}
40534072

40544073
/**
@@ -4227,7 +4246,7 @@ module Impl<FullStateConfigSig Config> {
42274246
}
42284247
}
42294248

4230-
private predicate partialPathStep(
4249+
private predicate partialPathStep0(
42314250
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
42324251
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
42334252
) {
@@ -4353,6 +4372,11 @@ module Impl<FullStateConfigSig Config> {
43534372
DataFlowType t1, PartialAccessPath ap1, Content c, DataFlowType t2, PartialAccessPath ap2
43544373
) {
43554374
partialPathStoreStep(_, t1, ap1, c, _, t2, ap2)
4375+
or
4376+
exists(DataFlowType t0 |
4377+
partialPathTypeStrengthen(t0, ap2, t2) and
4378+
apConsFwd(t1, ap1, c, t0, ap2)
4379+
)
43564380
}
43574381

43584382
pragma[nomagic]

‎csharp/ql/lib/semmle/code/csharp/dataflow/internal/DataFlowImpl.qll

Lines changed: 34 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -2677,7 +2677,7 @@ module Impl<FullStateConfigSig Config> {
26772677
TSummaryCtxSome(ParamNodeEx p, FlowState state, DataFlowType t, AccessPath ap) {
26782678
exists(AccessPathApprox apa | ap.getApprox() = apa |
26792679
Stage5::parameterMayFlowThrough(p, apa) and
2680-
Stage5::fwdFlow(p, state, _, _, _, _, t, apa, _) and
2680+
Stage5::fwdFlow(p, state, _, _, Option<DataFlowType>::some(t), _, _, apa, _) and
26812681
Stage5::revFlow(p, state, _)
26822682
)
26832683
}
@@ -4008,7 +4008,7 @@ module Impl<FullStateConfigSig Config> {
40084008
ap = TPartialNil() and
40094009
exists(explorationLimit())
40104010
or
4011-
partialPathNodeMk0(node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4011+
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
40124012
distSrc(node.getEnclosingCallable()) <= explorationLimit()
40134013
} or
40144014
TPartialPathNodeRev(
@@ -4034,21 +4034,40 @@ module Impl<FullStateConfigSig Config> {
40344034
}
40354035

40364036
pragma[nomagic]
4037-
private predicate partialPathNodeMk0(
4038-
NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1, TSummaryCtx2 sc2,
4039-
TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4037+
private predicate partialPathStep(
4038+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4039+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4040+
) {
4041+
partialPathStep1(mid, node, state, cc, sc1, sc2, sc3, sc4, _, t, ap)
4042+
}
4043+
4044+
pragma[nomagic]
4045+
private predicate partialPathStep1(
4046+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4047+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t0, DataFlowType t,
4048+
PartialAccessPath ap
40404049
) {
4041-
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4050+
partialPathStep0(mid, node, state, cc, sc1, sc2, sc3, sc4, t0, ap) and
40424051
not fullBarrier(node) and
40434052
not stateBarrier(node, state) and
40444053
not clearsContentEx(node, ap.getHead()) and
40454054
(
40464055
notExpectsContent(node) or
40474056
expectsContentEx(node, ap.getHead())
40484057
) and
4049-
if node.asNode() instanceof CastingNode
4050-
then compatibleTypes(node.getDataFlowType(), t)
4051-
else any()
4058+
if castingNodeEx(node)
4059+
then
4060+
exists(DataFlowType nt | nt = node.getDataFlowType() |
4061+
if typeStrongerThan(nt, t0) then t = nt else (compatibleTypes(nt, t0) and t = t0)
4062+
)
4063+
else t = t0
4064+
}
4065+
4066+
pragma[nomagic]
4067+
private predicate partialPathTypeStrengthen(
4068+
DataFlowType t0, PartialAccessPath ap, DataFlowType t
4069+
) {
4070+
partialPathStep1(_, _, _, _, _, _, _, _, t0, t, ap) and t0 != t
40524071
}
40534072

40544073
/**
@@ -4227,7 +4246,7 @@ module Impl<FullStateConfigSig Config> {
42274246
}
42284247
}
42294248

4230-
private predicate partialPathStep(
4249+
private predicate partialPathStep0(
42314250
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
42324251
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
42334252
) {
@@ -4353,6 +4372,11 @@ module Impl<FullStateConfigSig Config> {
43534372
DataFlowType t1, PartialAccessPath ap1, Content c, DataFlowType t2, PartialAccessPath ap2
43544373
) {
43554374
partialPathStoreStep(_, t1, ap1, c, _, t2, ap2)
4375+
or
4376+
exists(DataFlowType t0 |
4377+
partialPathTypeStrengthen(t0, ap2, t2) and
4378+
apConsFwd(t1, ap1, c, t0, ap2)
4379+
)
43564380
}
43574381

43584382
pragma[nomagic]

‎go/ql/lib/semmle/go/dataflow/internal/DataFlowImpl.qll

Lines changed: 34 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -2677,7 +2677,7 @@ module Impl<FullStateConfigSig Config> {
26772677
TSummaryCtxSome(ParamNodeEx p, FlowState state, DataFlowType t, AccessPath ap) {
26782678
exists(AccessPathApprox apa | ap.getApprox() = apa |
26792679
Stage5::parameterMayFlowThrough(p, apa) and
2680-
Stage5::fwdFlow(p, state, _, _, _, _, t, apa, _) and
2680+
Stage5::fwdFlow(p, state, _, _, Option<DataFlowType>::some(t), _, _, apa, _) and
26812681
Stage5::revFlow(p, state, _)
26822682
)
26832683
}
@@ -4008,7 +4008,7 @@ module Impl<FullStateConfigSig Config> {
40084008
ap = TPartialNil() and
40094009
exists(explorationLimit())
40104010
or
4011-
partialPathNodeMk0(node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4011+
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
40124012
distSrc(node.getEnclosingCallable()) <= explorationLimit()
40134013
} or
40144014
TPartialPathNodeRev(
@@ -4034,21 +4034,40 @@ module Impl<FullStateConfigSig Config> {
40344034
}
40354035

40364036
pragma[nomagic]
4037-
private predicate partialPathNodeMk0(
4038-
NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1, TSummaryCtx2 sc2,
4039-
TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4037+
private predicate partialPathStep(
4038+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4039+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
4040+
) {
4041+
partialPathStep1(mid, node, state, cc, sc1, sc2, sc3, sc4, _, t, ap)
4042+
}
4043+
4044+
pragma[nomagic]
4045+
private predicate partialPathStep1(
4046+
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
4047+
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t0, DataFlowType t,
4048+
PartialAccessPath ap
40404049
) {
4041-
partialPathStep(_, node, state, cc, sc1, sc2, sc3, sc4, t, ap) and
4050+
partialPathStep0(mid, node, state, cc, sc1, sc2, sc3, sc4, t0, ap) and
40424051
not fullBarrier(node) and
40434052
not stateBarrier(node, state) and
40444053
not clearsContentEx(node, ap.getHead()) and
40454054
(
40464055
notExpectsContent(node) or
40474056
expectsContentEx(node, ap.getHead())
40484057
) and
4049-
if node.asNode() instanceof CastingNode
4050-
then compatibleTypes(node.getDataFlowType(), t)
4051-
else any()
4058+
if castingNodeEx(node)
4059+
then
4060+
exists(DataFlowType nt | nt = node.getDataFlowType() |
4061+
if typeStrongerThan(nt, t0) then t = nt else (compatibleTypes(nt, t0) and t = t0)
4062+
)
4063+
else t = t0
4064+
}
4065+
4066+
pragma[nomagic]
4067+
private predicate partialPathTypeStrengthen(
4068+
DataFlowType t0, PartialAccessPath ap, DataFlowType t
4069+
) {
4070+
partialPathStep1(_, _, _, _, _, _, _, _, t0, t, ap) and t0 != t
40524071
}
40534072

40544073
/**
@@ -4227,7 +4246,7 @@ module Impl<FullStateConfigSig Config> {
42274246
}
42284247
}
42294248

4230-
private predicate partialPathStep(
4249+
private predicate partialPathStep0(
42314250
PartialPathNodeFwd mid, NodeEx node, FlowState state, CallContext cc, TSummaryCtx1 sc1,
42324251
TSummaryCtx2 sc2, TSummaryCtx3 sc3, TSummaryCtx4 sc4, DataFlowType t, PartialAccessPath ap
42334252
) {
@@ -4353,6 +4372,11 @@ module Impl<FullStateConfigSig Config> {
43534372
DataFlowType t1, PartialAccessPath ap1, Content c, DataFlowType t2, PartialAccessPath ap2
43544373
) {
43554374
partialPathStoreStep(_, t1, ap1, c, _, t2, ap2)
4375+
or
4376+
exists(DataFlowType t0 |
4377+
partialPathTypeStrengthen(t0, ap2, t2) and
4378+
apConsFwd(t1, ap1, c, t0, ap2)
4379+
)
43564380
}
43574381

43584382
pragma[nomagic]

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