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Python: Reclassify defaultValueFlowStep
as a `jumpStep`.
1 parent fcd346c commit 4a5f70e

10 files changed

Lines changed: 56 additions & 9 deletions

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‎python/change-notes/2021-09-08-add-flow-from-default-values.md‎

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@@ -0,0 +1,2 @@
1+
lgtm,codescanning
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* Function parameters with default values will now see flow from those values.

‎python/ql/lib/semmle/python/dataflow/new/internal/DataFlowPrivate.qll‎

Lines changed: 3 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -209,9 +209,6 @@ module EssaFlow {
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nodeTo = TKwOverflowNode(call, callable) and
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nodeFrom.asCfgNode() = call.getNode().getKwargs().getAFlowNode()
211211
)
212-
or
213-
// Default value for parameter flows to that parameter
214-
defaultValueFlowStep(nodeFrom, nodeTo)
215212
}
216213

217214
predicate useToNextUse(NameNode nodeFrom, NameNode nodeTo) {
@@ -872,6 +869,9 @@ predicate jumpStep(Node nodeFrom, Node nodeTo) {
872869
module_export(mv.getScope(), r.getAttributeName(), nodeFrom) and
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nodeTo = r
874871
)
872+
or
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// Default value for parameter flows to that parameter
874+
defaultValueFlowStep(nodeFrom, nodeTo)
875875
}
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877877
/**

‎python/ql/test/experimental/dataflow/coverage/argumentPassing.py‎

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Original file line numberDiff line numberDiff line change
@@ -66,9 +66,9 @@ def argument_passing(
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b,
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/,
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c,
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d=arg4,
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d=arg4, #$ arg4 func=argument_passing
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*,
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e=arg5,
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e=arg5, #$ arg5 func=argument_passing
7272
f,
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**g,
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):
@@ -120,7 +120,7 @@ def test_multiple_kw_args():
120120
with_multiple_kw_args(**{"b": arg2}, **{"c": arg3}, **{"a": arg1}) #$ arg1 arg2 arg3 func=with_multiple_kw_args
121121

122122

123-
def with_default_arguments(a=arg1, b=arg2, c=arg3): # Need a mechanism to test default arguments
123+
def with_default_arguments(a=arg1, b=arg2, c=arg3): #$ arg1 arg2 arg3 func=with_default_arguments
124124
SINK1(a)
125125
SINK2(b)
126126
SINK3(c)

‎python/ql/test/experimental/dataflow/coverage/argumentRouting1.expected‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -14,6 +14,8 @@ edges
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| argumentPassing.py:120:59:120:69 | ControlFlowNode for Dict [Dictionary element at key a] | argumentPassing.py:120:5:120:70 | KwUnpacked a |
1515
| argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | argumentPassing.py:120:59:120:69 | ControlFlowNode for Dict [Dictionary element at key a] |
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| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | argumentPassing.py:124:11:124:11 | ControlFlowNode for a |
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| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | argumentPassing.py:124:11:124:11 | ControlFlowNode for a |
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| argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | argumentPassing.py:123:28:123:28 | ControlFlowNode for a |
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| argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | argumentPassing.py:123:28:123:28 | ControlFlowNode for a |
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| argumentPassing.py:138:22:138:24 | ControlFlowNode for foo | argumentPassing.py:139:11:139:13 | ControlFlowNode for foo |
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| argumentPassing.py:160:46:160:49 | ControlFlowNode for arg1 | argumentPassing.py:138:22:138:24 | ControlFlowNode for foo |
@@ -102,6 +104,8 @@ nodes
102104
| argumentPassing.py:120:59:120:69 | ControlFlowNode for Dict [Dictionary element at key a] | semmle.label | ControlFlowNode for Dict [Dictionary element at key a] |
103105
| argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | semmle.label | ControlFlowNode for arg1 |
104106
| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
107+
| argumentPassing.py:123:28:123:28 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
108+
| argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | semmle.label | ControlFlowNode for arg1 |
105109
| argumentPassing.py:124:11:124:11 | ControlFlowNode for a | semmle.label | ControlFlowNode for a |
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| argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | semmle.label | ControlFlowNode for arg1 |
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| argumentPassing.py:138:22:138:24 | ControlFlowNode for foo | semmle.label | ControlFlowNode for foo |
@@ -206,6 +210,7 @@ nodes
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| argumentPassing.py:118:27:118:30 | ControlFlowNode for arg1 | argumentPassing.py:118:27:118:30 | ControlFlowNode for arg1 | argumentPassing.py:110:11:110:11 | ControlFlowNode for a | Flow found |
207211
| argumentPassing.py:119:27:119:30 | ControlFlowNode for arg1 | argumentPassing.py:119:27:119:30 | ControlFlowNode for arg1 | argumentPassing.py:110:11:110:11 | ControlFlowNode for a | Flow found |
208212
| argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | argumentPassing.py:120:65:120:68 | ControlFlowNode for arg1 | argumentPassing.py:110:11:110:11 | ControlFlowNode for a | Flow found |
213+
| argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | argumentPassing.py:123:30:123:33 | ControlFlowNode for arg1 | argumentPassing.py:124:11:124:11 | ControlFlowNode for a | Flow found |
209214
| argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | argumentPassing.py:132:28:132:31 | ControlFlowNode for arg1 | argumentPassing.py:124:11:124:11 | ControlFlowNode for a | Flow found |
210215
| argumentPassing.py:160:46:160:49 | ControlFlowNode for arg1 | argumentPassing.py:160:46:160:49 | ControlFlowNode for arg1 | argumentPassing.py:139:11:139:13 | ControlFlowNode for foo | Flow found |
211216
| argumentPassing.py:168:14:168:17 | ControlFlowNode for arg1 | argumentPassing.py:168:14:168:17 | ControlFlowNode for arg1 | argumentPassing.py:166:15:166:15 | ControlFlowNode for a | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting2.expected‎

Lines changed: 5 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -10,6 +10,8 @@ edges
1010
| argumentPassing.py:120:29:120:39 | ControlFlowNode for Dict [Dictionary element at key b] | argumentPassing.py:120:5:120:70 | KwUnpacked b |
1111
| argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | argumentPassing.py:120:29:120:39 | ControlFlowNode for Dict [Dictionary element at key b] |
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| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | argumentPassing.py:125:11:125:11 | ControlFlowNode for b |
13+
| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | argumentPassing.py:125:11:125:11 | ControlFlowNode for b |
14+
| argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | argumentPassing.py:123:36:123:36 | ControlFlowNode for b |
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| argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | argumentPassing.py:123:36:123:36 | ControlFlowNode for b |
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| argumentPassing.py:138:29:138:34 | ControlFlowNode for kwargs [Dictionary element at key bar] | argumentPassing.py:140:20:140:25 | ControlFlowNode for kwargs [Dictionary element at key bar] |
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| argumentPassing.py:140:5:140:26 | KwUnpacked bar | argumentPassing.py:145:18:145:20 | ControlFlowNode for bar |
@@ -64,6 +66,8 @@ nodes
6466
| argumentPassing.py:120:29:120:39 | ControlFlowNode for Dict [Dictionary element at key b] | semmle.label | ControlFlowNode for Dict [Dictionary element at key b] |
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| argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | semmle.label | ControlFlowNode for arg2 |
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| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | semmle.label | ControlFlowNode for b |
69+
| argumentPassing.py:123:36:123:36 | ControlFlowNode for b | semmle.label | ControlFlowNode for b |
70+
| argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | semmle.label | ControlFlowNode for arg2 |
6771
| argumentPassing.py:125:11:125:11 | ControlFlowNode for b | semmle.label | ControlFlowNode for b |
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| argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | semmle.label | ControlFlowNode for arg2 |
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| argumentPassing.py:138:29:138:34 | ControlFlowNode for kwargs [Dictionary element at key bar] | semmle.label | ControlFlowNode for kwargs [Dictionary element at key bar] |
@@ -127,6 +131,7 @@ nodes
127131
| argumentPassing.py:105:27:105:30 | ControlFlowNode for arg2 | argumentPassing.py:105:27:105:30 | ControlFlowNode for arg2 | argumentPassing.py:99:11:99:11 | ControlFlowNode for b | Flow found |
128132
| argumentPassing.py:117:29:117:32 | ControlFlowNode for arg2 | argumentPassing.py:117:29:117:32 | ControlFlowNode for arg2 | argumentPassing.py:111:11:111:11 | ControlFlowNode for b | Flow found |
129133
| argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | argumentPassing.py:120:35:120:38 | ControlFlowNode for arg2 | argumentPassing.py:111:11:111:11 | ControlFlowNode for b | Flow found |
134+
| argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | argumentPassing.py:123:38:123:41 | ControlFlowNode for arg2 | argumentPassing.py:125:11:125:11 | ControlFlowNode for b | Flow found |
130135
| argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | argumentPassing.py:133:30:133:33 | ControlFlowNode for arg2 | argumentPassing.py:125:11:125:11 | ControlFlowNode for b | Flow found |
131136
| argumentPassing.py:160:36:160:39 | ControlFlowNode for arg2 | argumentPassing.py:160:36:160:39 | ControlFlowNode for arg2 | argumentPassing.py:146:11:146:13 | ControlFlowNode for bar | Flow found |
132137
| classes.py:565:18:565:21 | ControlFlowNode for arg2 | classes.py:565:18:565:21 | ControlFlowNode for arg2 | classes.py:556:15:556:17 | ControlFlowNode for key | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting3.expected‎

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@@ -10,6 +10,8 @@ edges
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| argumentPassing.py:120:44:120:54 | ControlFlowNode for Dict [Dictionary element at key c] | argumentPassing.py:120:5:120:70 | KwUnpacked c |
1111
| argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | argumentPassing.py:120:44:120:54 | ControlFlowNode for Dict [Dictionary element at key c] |
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| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | argumentPassing.py:126:11:126:11 | ControlFlowNode for c |
13+
| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | argumentPassing.py:126:11:126:11 | ControlFlowNode for c |
14+
| argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | argumentPassing.py:123:44:123:44 | ControlFlowNode for c |
1315
| argumentPassing.py:134:5:134:41 | KwUnpacked c | argumentPassing.py:123:44:123:44 | ControlFlowNode for c |
1416
| argumentPassing.py:134:30:134:40 | ControlFlowNode for Dict [Dictionary element at key c] | argumentPassing.py:134:5:134:41 | KwUnpacked c |
1517
| argumentPassing.py:134:36:134:39 | ControlFlowNode for arg3 | argumentPassing.py:134:30:134:40 | ControlFlowNode for Dict [Dictionary element at key c] |
@@ -37,6 +39,8 @@ nodes
3739
| argumentPassing.py:120:44:120:54 | ControlFlowNode for Dict [Dictionary element at key c] | semmle.label | ControlFlowNode for Dict [Dictionary element at key c] |
3840
| argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | semmle.label | ControlFlowNode for arg3 |
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| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | semmle.label | ControlFlowNode for c |
42+
| argumentPassing.py:123:44:123:44 | ControlFlowNode for c | semmle.label | ControlFlowNode for c |
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| argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | semmle.label | ControlFlowNode for arg3 |
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| argumentPassing.py:126:11:126:11 | ControlFlowNode for c | semmle.label | ControlFlowNode for c |
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| argumentPassing.py:134:5:134:41 | KwUnpacked c | semmle.label | KwUnpacked c |
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| argumentPassing.py:134:30:134:40 | ControlFlowNode for Dict [Dictionary element at key c] | semmle.label | ControlFlowNode for Dict [Dictionary element at key c] |
@@ -58,6 +62,7 @@ nodes
5862
| argumentPassing.py:117:37:117:40 | ControlFlowNode for arg3 | argumentPassing.py:117:37:117:40 | ControlFlowNode for arg3 | argumentPassing.py:112:11:112:11 | ControlFlowNode for c | Flow found |
5963
| argumentPassing.py:119:41:119:44 | ControlFlowNode for arg3 | argumentPassing.py:119:41:119:44 | ControlFlowNode for arg3 | argumentPassing.py:112:11:112:11 | ControlFlowNode for c | Flow found |
6064
| argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | argumentPassing.py:120:50:120:53 | ControlFlowNode for arg3 | argumentPassing.py:112:11:112:11 | ControlFlowNode for c | Flow found |
65+
| argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | argumentPassing.py:123:46:123:49 | ControlFlowNode for arg3 | argumentPassing.py:126:11:126:11 | ControlFlowNode for c | Flow found |
6166
| argumentPassing.py:134:36:134:39 | ControlFlowNode for arg3 | argumentPassing.py:134:36:134:39 | ControlFlowNode for arg3 | argumentPassing.py:126:11:126:11 | ControlFlowNode for c | Flow found |
6267
| argumentPassing.py:160:26:160:29 | ControlFlowNode for arg3 | argumentPassing.py:160:26:160:29 | ControlFlowNode for arg3 | argumentPassing.py:155:11:155:13 | ControlFlowNode for baz | Flow found |
6368
| classes.py:581:26:581:29 | ControlFlowNode for arg3 | classes.py:581:26:581:29 | ControlFlowNode for arg3 | classes.py:571:15:571:19 | ControlFlowNode for value | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting4.expected‎

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edges
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| argumentPassing.py:69:5:69:5 | ControlFlowNode for d | argumentPassing.py:78:11:78:11 | ControlFlowNode for d |
3+
| argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | argumentPassing.py:69:5:69:5 | ControlFlowNode for d |
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nodes
5+
| argumentPassing.py:69:5:69:5 | ControlFlowNode for d | semmle.label | ControlFlowNode for d |
6+
| argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | semmle.label | ControlFlowNode for arg4 |
7+
| argumentPassing.py:78:11:78:11 | ControlFlowNode for d | semmle.label | ControlFlowNode for d |
38
#select
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| argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | argumentPassing.py:69:7:69:10 | ControlFlowNode for arg4 | argumentPassing.py:78:11:78:11 | ControlFlowNode for d | Flow found |

‎python/ql/test/experimental/dataflow/coverage/argumentRouting5.expected‎

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edges
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| argumentPassing.py:71:5:71:5 | ControlFlowNode for e | argumentPassing.py:79:11:79:11 | ControlFlowNode for e |
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| argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | argumentPassing.py:71:5:71:5 | ControlFlowNode for e |
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nodes
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| argumentPassing.py:71:5:71:5 | ControlFlowNode for e | semmle.label | ControlFlowNode for e |
6+
| argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | semmle.label | ControlFlowNode for arg5 |
7+
| argumentPassing.py:79:11:79:11 | ControlFlowNode for e | semmle.label | ControlFlowNode for e |
38
#select
9+
| argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | argumentPassing.py:71:7:71:10 | ControlFlowNode for arg5 | argumentPassing.py:79:11:79:11 | ControlFlowNode for e | Flow found |

‎python/ql/test/experimental/dataflow/coverage/dataflow.expected‎

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@@ -347,6 +347,12 @@ edges
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| test.py:686:43:686:48 | ControlFlowNode for SOURCE | test.py:686:3:686:52 | PosOverflowNode for iterate_star_args() [Tuple element at index 0] |
348348
| test.py:686:51:686:51 | ControlFlowNode for s | test.py:686:3:686:52 | PosOverflowNode for iterate_star_args() [Tuple element at index 1] |
349349
| test.py:757:16:757:21 | ControlFlowNode for SOURCE | test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() |
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| test.py:795:35:795:35 | ControlFlowNode for x | test.py:796:10:796:10 | ControlFlowNode for x |
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| test.py:795:37:795:42 | ControlFlowNode for SOURCE | test.py:795:35:795:35 | ControlFlowNode for x |
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| test.py:795:48:795:48 | ControlFlowNode for y | test.py:797:10:797:10 | ControlFlowNode for y |
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| test.py:795:50:795:55 | ControlFlowNode for SOURCE | test.py:795:48:795:48 | ControlFlowNode for y |
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| test.py:795:61:795:61 | ControlFlowNode for z | test.py:798:10:798:10 | ControlFlowNode for z |
355+
| test.py:795:63:795:68 | ControlFlowNode for SOURCE | test.py:795:61:795:61 | ControlFlowNode for z |
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nodes
351357
| datamodel.py:38:6:38:17 | ControlFlowNode for f() | semmle.label | ControlFlowNode for f() |
352358
| datamodel.py:38:8:38:13 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
@@ -758,6 +764,15 @@ nodes
758764
| test.py:686:51:686:51 | ControlFlowNode for s | semmle.label | ControlFlowNode for s |
759765
| test.py:757:16:757:21 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
760766
| test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() | semmle.label | ControlFlowNode for return_from_inner_scope() |
767+
| test.py:795:35:795:35 | ControlFlowNode for x | semmle.label | ControlFlowNode for x |
768+
| test.py:795:37:795:42 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
769+
| test.py:795:48:795:48 | ControlFlowNode for y | semmle.label | ControlFlowNode for y |
770+
| test.py:795:50:795:55 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
771+
| test.py:795:61:795:61 | ControlFlowNode for z | semmle.label | ControlFlowNode for z |
772+
| test.py:795:63:795:68 | ControlFlowNode for SOURCE | semmle.label | ControlFlowNode for SOURCE |
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| test.py:796:10:796:10 | ControlFlowNode for x | semmle.label | ControlFlowNode for x |
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| test.py:797:10:797:10 | ControlFlowNode for y | semmle.label | ControlFlowNode for y |
775+
| test.py:798:10:798:10 | ControlFlowNode for z | semmle.label | ControlFlowNode for z |
761776
#select
762777
| datamodel.py:38:6:38:17 | ControlFlowNode for f() | datamodel.py:38:8:38:13 | ControlFlowNode for SOURCE | datamodel.py:38:6:38:17 | ControlFlowNode for f() | Flow found |
763778
| datamodel.py:71:6:71:24 | ControlFlowNode for Attribute() | datamodel.py:71:15:71:20 | ControlFlowNode for SOURCE | datamodel.py:71:6:71:24 | ControlFlowNode for Attribute() | Flow found |
@@ -865,3 +880,6 @@ nodes
865880
| test.py:680:10:680:12 | ControlFlowNode for arg | test.py:685:7:685:12 | ControlFlowNode for SOURCE | test.py:680:10:680:12 | ControlFlowNode for arg | Flow found |
866881
| test.py:680:10:680:12 | ControlFlowNode for arg | test.py:686:43:686:48 | ControlFlowNode for SOURCE | test.py:680:10:680:12 | ControlFlowNode for arg | Flow found |
867882
| test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() | test.py:757:16:757:21 | ControlFlowNode for SOURCE | test.py:760:10:760:36 | ControlFlowNode for return_from_inner_scope() | Flow found |
883+
| test.py:796:10:796:10 | ControlFlowNode for x | test.py:795:37:795:42 | ControlFlowNode for SOURCE | test.py:796:10:796:10 | ControlFlowNode for x | Flow found |
884+
| test.py:797:10:797:10 | ControlFlowNode for y | test.py:795:50:795:55 | ControlFlowNode for SOURCE | test.py:797:10:797:10 | ControlFlowNode for y | Flow found |
885+
| test.py:798:10:798:10 | ControlFlowNode for z | test.py:795:63:795:68 | ControlFlowNode for SOURCE | test.py:798:10:798:10 | ControlFlowNode for z | Flow found |

‎python/ql/test/experimental/dataflow/coverage/test.py‎

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@@ -793,6 +793,6 @@ def test_reverse_read_subscript_cls():
793793

794794
@expects(3)
795795
def test_with_default_param_value(x=SOURCE, /, y=SOURCE, *, z=SOURCE):
796-
SINK(x) #$ MISSING:flow="SOURCE, l:-1 -> x"
797-
SINK(y) #$ MISSING:flow="SOURCE, l:-2 -> y"
798-
SINK(z) #$ MISSING:flow="SOURCE, l:-3 -> z"
796+
SINK(x) #$ flow="SOURCE, l:-1 -> x"
797+
SINK(y) #$ flow="SOURCE, l:-2 -> y"
798+
SINK(z) #$ flow="SOURCE, l:-3 -> z"

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