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Go: fix models for built-in functions #16413

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merged 16 commits into from
May 14, 2024
Merged

Go: fix models for built-in functions #16413

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e857eed
Fix model for `append` - it is variadic
owen-mc May 3, 2024
1322ce3
Add model for built-in function `copy`
owen-mc May 3, 2024
fcdac0a
Add models for `min` and `max` built-in functions
owen-mc May 7, 2024
f95ccd2
Remove old-style models of built-in functions
owen-mc May 7, 2024
84b7319
Rename test folder `ExternalFlow` to `ExternalTaintFlow`
owen-mc Apr 30, 2024
c816412
Create copy of `ExternalTaintFlow` called `ExternalValueFlow`
owen-mc May 4, 2024
eab1569
Update `ExternalValueFlow` to use value flow
owen-mc Apr 30, 2024
86e2b84
Add tests for `copy` (taint passes, value fails)
owen-mc May 4, 2024
d5aa08d
Local flow steps for flow summaries for built-in functions
owen-mc May 8, 2024
8cc9838
Add change note
owen-mc May 8, 2024
e1c85e3
Fix `elementWrite` to include flow summaries
owen-mc May 8, 2024
7694618
Accept MaD renumbering for edge provenance
owen-mc May 10, 2024
f8e17fe
Accept expected test changes
owen-mc May 10, 2024
f7e6bf7
Two tests have different paths but same results
owen-mc May 10, 2024
ab5e1f8
Fix models for `min` and `max` and improve tests
owen-mc May 14, 2024
827d15a
Test changes due to model renumbering
owen-mc May 14, 2024
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4 changes: 4 additions & 0 deletions go/ql/lib/change-notes/2024-05-09-model-append-copy-max-min.md
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@@ -0,0 +1,4 @@
---
category: minorAnalysis
---
* Converted the models for the built-in functions `append`, `copy`, `max` and `min` to value flow and Models-as-Data.
5 changes: 4 additions & 1 deletion go/ql/lib/ext/builtin.model.yml
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Expand Up @@ -4,4 +4,7 @@ extensions:
extensible: summaryModel
data:
- ["", "", False, "append", "", "", "Argument[0].ArrayElement", "ReturnValue.ArrayElement", "value", "manual"]
- ["", "", False, "append", "", "", "Argument[1]", "ReturnValue.ArrayElement", "value", "manual"]
- ["", "", False, "append", "", "", "Argument[1].ArrayElement", "ReturnValue.ArrayElement", "value", "manual"]
- ["", "", False, "copy", "", "", "Argument[1].ArrayElement", "Argument[0].ArrayElement", "value", "manual"]
- ["", "", False, "max", "", "", "Argument[0..1000]", "ReturnValue", "value", "manual"]
- ["", "", False, "min", "", "", "Argument[0..1000]", "ReturnValue", "value", "manual"]
4 changes: 4 additions & 0 deletions go/ql/lib/semmle/go/dataflow/internal/TaintTrackingUtil.qll
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Expand Up @@ -140,6 +140,10 @@ predicate referenceStep(DataFlow::Node pred, DataFlow::Node succ) {
*/
predicate elementWriteStep(DataFlow::Node pred, DataFlow::Node succ) {
any(DataFlow::Write w).writesElement(succ.(DataFlow::PostUpdateNode).getPreUpdateNode(), _, pred)
or
FlowSummaryImpl::Private::Steps::summaryStoreStep(pred.(DataFlowPrivate::FlowSummaryNode)
.getSummaryNode(), any(DataFlow::Content c | c instanceof DataFlow::ArrayContent),
succ.(DataFlowPrivate::FlowSummaryNode).getSummaryNode())
}

/** Holds if taint flows from `pred` to `succ` via a field read. */
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52 changes: 0 additions & 52 deletions go/ql/lib/semmle/go/frameworks/Stdlib.qll
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Expand Up @@ -44,58 +44,6 @@ import semmle.go.frameworks.stdlib.TextTabwriter
import semmle.go.frameworks.stdlib.TextTemplate
import semmle.go.frameworks.stdlib.Unsafe

// These are modeled using TaintTracking::FunctionModel because they doesn't have real type signatures,
// and therefore currently have an InvalidType, not a SignatureType, which breaks Models as Data.
/**
* A model of the built-in `append` function, which propagates taint from its arguments to its
* result.
*/
private class AppendFunction extends TaintTracking::FunctionModel {
AppendFunction() { this = Builtin::append() }

override predicate hasTaintFlow(FunctionInput inp, FunctionOutput outp) {
inp.isParameter(_) and outp.isResult()
}
}

/**
* A model of the built-in `copy` function, which propagates taint from its second argument
* to its first.
*/
private class CopyFunction extends TaintTracking::FunctionModel {
CopyFunction() { this = Builtin::copy() }

override predicate hasTaintFlow(FunctionInput inp, FunctionOutput outp) {
inp.isParameter(1) and outp.isParameter(0)
}
}

/**
* A model of the built-in `min` function, which computes the smallest value of a fixed number of
* arguments of ordered types. There is at least one argument and "ordered types" includes e.g.
* strings, so we care about data flow through `min`.
*/
private class MinFunction extends DataFlow::FunctionModel {
MinFunction() { this = Builtin::min_() }

override predicate hasDataFlow(FunctionInput inp, FunctionOutput outp) {
inp.isParameter(_) and outp.isResult()
}
}

/**
* A model of the built-in `max` function, which computes the largest value of a fixed number of
* arguments of ordered types. There is at least one argument and "ordered types" includes e.g.
* strings, so we care about data flow through `max`.
*/
private class MaxFunction extends DataFlow::FunctionModel {
MaxFunction() { this = Builtin::max_() }

override predicate hasDataFlow(FunctionInput inp, FunctionOutput outp) {
inp.isParameter(_) and outp.isResult()
}
}

/** Provides a class for modeling functions which convert strings into integers. */
module IntegerParser {
/**
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28 changes: 14 additions & 14 deletions go/ql/test/experimental/CWE-090/LDAPInjection.expected
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@@ -1,18 +1,18 @@
edges
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:59:3:59:11 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:61:3:61:51 | ...+... | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:62:3:62:33 | slice literal | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:62:24:62:32 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:66:3:66:11 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:68:3:68:51 | ...+... | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:69:3:69:33 | slice literal | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:69:24:69:32 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:73:3:73:11 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:75:3:75:51 | ...+... | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:76:3:76:33 | slice literal | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:76:24:76:32 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:80:22:80:30 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:81:25:81:33 | untrusted | provenance | Src:MaD:671 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:59:3:59:11 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:61:3:61:51 | ...+... | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:62:3:62:33 | slice literal | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:62:24:62:32 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:66:3:66:11 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:68:3:68:51 | ...+... | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:69:3:69:33 | slice literal | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:69:24:69:32 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:73:3:73:11 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:75:3:75:51 | ...+... | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:76:3:76:33 | slice literal | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:76:24:76:32 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:80:22:80:30 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:57:15:57:29 | call to UserAgent | LDAPInjection.go:81:25:81:33 | untrusted | provenance | Src:MaD:674 |
| LDAPInjection.go:62:3:62:33 | slice literal [array] | LDAPInjection.go:62:3:62:33 | slice literal | provenance | |
| LDAPInjection.go:62:24:62:32 | untrusted | LDAPInjection.go:62:3:62:33 | slice literal [array] | provenance | |
| LDAPInjection.go:69:3:69:33 | slice literal [array] | LDAPInjection.go:69:3:69:33 | slice literal | provenance | |
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6 changes: 3 additions & 3 deletions go/ql/test/experimental/CWE-203/Timing.expected
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@@ -1,9 +1,9 @@
edges
| timing.go:15:18:15:27 | selection of Header | timing.go:15:18:15:45 | call to Get | provenance | MaD:652 |
| timing.go:15:18:15:27 | selection of Header | timing.go:15:18:15:45 | call to Get | provenance | MaD:655 |
| timing.go:15:18:15:45 | call to Get | timing.go:17:31:17:42 | headerSecret | provenance | |
| timing.go:28:18:28:27 | selection of Header | timing.go:28:18:28:45 | call to Get | provenance | MaD:652 |
| timing.go:28:18:28:27 | selection of Header | timing.go:28:18:28:45 | call to Get | provenance | MaD:655 |
| timing.go:28:18:28:45 | call to Get | timing.go:30:47:30:58 | headerSecret | provenance | |
| timing.go:41:18:41:27 | selection of Header | timing.go:41:18:41:45 | call to Get | provenance | MaD:652 |
| timing.go:41:18:41:27 | selection of Header | timing.go:41:18:41:45 | call to Get | provenance | MaD:655 |
| timing.go:41:18:41:45 | call to Get | timing.go:42:25:42:36 | headerSecret | provenance | |
nodes
| timing.go:15:18:15:27 | selection of Header | semmle.label | selection of Header |
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2 changes: 1 addition & 1 deletion go/ql/test/experimental/CWE-287/ImproperLdapAuth.expected
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@@ -1,5 +1,5 @@
edges
| ImproperLdapAuth.go:18:18:18:24 | selection of URL | ImproperLdapAuth.go:18:18:18:32 | call to Query | provenance | MaD:732 |
| ImproperLdapAuth.go:18:18:18:24 | selection of URL | ImproperLdapAuth.go:18:18:18:32 | call to Query | provenance | MaD:735 |
| ImproperLdapAuth.go:18:18:18:32 | call to Query | ImproperLdapAuth.go:28:23:28:34 | bindPassword | provenance | |
| ImproperLdapAuth.go:87:18:87:19 | "" | ImproperLdapAuth.go:97:23:97:34 | bindPassword | provenance | |
nodes
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12 changes: 6 additions & 6 deletions go/ql/test/experimental/CWE-369/DivideByZero.expected
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@@ -1,24 +1,24 @@
edges
| DivideByZero.go:10:12:10:16 | selection of URL | DivideByZero.go:10:12:10:24 | call to Query | provenance | MaD:732 |
| DivideByZero.go:10:12:10:16 | selection of URL | DivideByZero.go:10:12:10:24 | call to Query | provenance | MaD:735 |
| DivideByZero.go:10:12:10:24 | call to Query | DivideByZero.go:11:27:11:32 | param1 | provenance | |
| DivideByZero.go:11:2:11:33 | ... := ...[0] | DivideByZero.go:12:16:12:20 | value | provenance | |
| DivideByZero.go:11:27:11:32 | param1 | DivideByZero.go:11:2:11:33 | ... := ...[0] | provenance | |
| DivideByZero.go:17:12:17:16 | selection of URL | DivideByZero.go:17:12:17:24 | call to Query | provenance | MaD:732 |
| DivideByZero.go:17:12:17:16 | selection of URL | DivideByZero.go:17:12:17:24 | call to Query | provenance | MaD:735 |
| DivideByZero.go:17:12:17:24 | call to Query | DivideByZero.go:18:11:18:24 | type conversion | provenance | |
| DivideByZero.go:18:11:18:24 | type conversion | DivideByZero.go:19:16:19:20 | value | provenance | |
| DivideByZero.go:24:12:24:16 | selection of URL | DivideByZero.go:24:12:24:24 | call to Query | provenance | MaD:732 |
| DivideByZero.go:24:12:24:16 | selection of URL | DivideByZero.go:24:12:24:24 | call to Query | provenance | MaD:735 |
| DivideByZero.go:24:12:24:24 | call to Query | DivideByZero.go:25:31:25:36 | param1 | provenance | |
| DivideByZero.go:25:2:25:45 | ... := ...[0] | DivideByZero.go:26:16:26:20 | value | provenance | |
| DivideByZero.go:25:31:25:36 | param1 | DivideByZero.go:25:2:25:45 | ... := ...[0] | provenance | |
| DivideByZero.go:31:12:31:16 | selection of URL | DivideByZero.go:31:12:31:24 | call to Query | provenance | MaD:732 |
| DivideByZero.go:31:12:31:16 | selection of URL | DivideByZero.go:31:12:31:24 | call to Query | provenance | MaD:735 |
| DivideByZero.go:31:12:31:24 | call to Query | DivideByZero.go:32:33:32:38 | param1 | provenance | |
| DivideByZero.go:32:2:32:43 | ... := ...[0] | DivideByZero.go:33:16:33:20 | value | provenance | |
| DivideByZero.go:32:33:32:38 | param1 | DivideByZero.go:32:2:32:43 | ... := ...[0] | provenance | |
| DivideByZero.go:38:12:38:16 | selection of URL | DivideByZero.go:38:12:38:24 | call to Query | provenance | MaD:732 |
| DivideByZero.go:38:12:38:16 | selection of URL | DivideByZero.go:38:12:38:24 | call to Query | provenance | MaD:735 |
| DivideByZero.go:38:12:38:24 | call to Query | DivideByZero.go:39:32:39:37 | param1 | provenance | |
| DivideByZero.go:39:2:39:46 | ... := ...[0] | DivideByZero.go:40:16:40:20 | value | provenance | |
| DivideByZero.go:39:32:39:37 | param1 | DivideByZero.go:39:2:39:46 | ... := ...[0] | provenance | |
| DivideByZero.go:54:12:54:16 | selection of URL | DivideByZero.go:54:12:54:24 | call to Query | provenance | MaD:732 |
| DivideByZero.go:54:12:54:16 | selection of URL | DivideByZero.go:54:12:54:24 | call to Query | provenance | MaD:735 |
| DivideByZero.go:54:12:54:24 | call to Query | DivideByZero.go:55:11:55:24 | type conversion | provenance | |
| DivideByZero.go:55:11:55:24 | type conversion | DivideByZero.go:57:17:57:21 | value | provenance | |
nodes
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10 changes: 5 additions & 5 deletions go/ql/test/experimental/CWE-522-DecompressionBombs/DecompressionBombs.expected
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@@ -1,5 +1,5 @@
edges
| test.go:59:16:59:44 | call to FormValue | test.go:128:20:128:27 | definition of filename | provenance | Src:MaD:667 |
| test.go:59:16:59:44 | call to FormValue | test.go:128:20:128:27 | definition of filename | provenance | Src:MaD:670 |
| test.go:60:15:60:26 | selection of Body | test.go:158:19:158:22 | definition of file | provenance | |
| test.go:61:24:61:35 | selection of Body | test.go:169:28:169:31 | definition of file | provenance | |
| test.go:62:13:62:24 | selection of Body | test.go:181:17:181:20 | definition of file | provenance | |
Expand Down Expand Up @@ -34,18 +34,18 @@ edges
| test.go:145:12:145:19 | call to Open | test.go:147:37:147:38 | rc | provenance | |
| test.go:158:19:158:22 | definition of file | test.go:159:25:159:28 | file | provenance | |
| test.go:159:2:159:29 | ... := ...[0] | test.go:160:48:160:52 | file1 | provenance | |
| test.go:159:25:159:28 | file | test.go:159:2:159:29 | ... := ...[0] | provenance | MaD:544 |
| test.go:159:25:159:28 | file | test.go:159:2:159:29 | ... := ...[0] | provenance | MaD:547 |
| test.go:160:2:160:69 | ... := ...[0] | test.go:163:26:163:29 | file | provenance | |
| test.go:160:32:160:53 | call to NewReader | test.go:160:2:160:69 | ... := ...[0] | provenance | |
| test.go:160:48:160:52 | file1 | test.go:160:32:160:53 | call to NewReader | provenance | MaD:40 |
| test.go:160:48:160:52 | file1 | test.go:160:32:160:53 | call to NewReader | provenance | MaD:43 |
| test.go:163:3:163:36 | ... := ...[0] | test.go:164:36:164:51 | fileReaderCloser | provenance | |
| test.go:163:26:163:29 | file | test.go:163:3:163:36 | ... := ...[0] | provenance | MaD:8 |
| test.go:169:28:169:31 | definition of file | test.go:170:25:170:28 | file | provenance | |
| test.go:170:2:170:29 | ... := ...[0] | test.go:171:57:171:61 | file2 | provenance | |
| test.go:170:25:170:28 | file | test.go:170:2:170:29 | ... := ...[0] | provenance | MaD:544 |
| test.go:170:25:170:28 | file | test.go:170:2:170:29 | ... := ...[0] | provenance | MaD:547 |
| test.go:171:2:171:78 | ... := ...[0] | test.go:175:26:175:29 | file | provenance | |
| test.go:171:41:171:62 | call to NewReader | test.go:171:2:171:78 | ... := ...[0] | provenance | |
| test.go:171:57:171:61 | file2 | test.go:171:41:171:62 | call to NewReader | provenance | MaD:40 |
| test.go:171:57:171:61 | file2 | test.go:171:41:171:62 | call to NewReader | provenance | MaD:43 |
| test.go:175:26:175:29 | file | test.go:175:26:175:36 | call to Open | provenance | |
| test.go:175:26:175:36 | call to Open | test.go:176:36:176:51 | fileReaderCloser | provenance | |
| test.go:181:17:181:20 | definition of file | test.go:184:41:184:44 | file | provenance | |
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4 changes: 2 additions & 2 deletions go/ql/test/experimental/CWE-74/DsnInjection.expected
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@@ -1,6 +1,6 @@
edges
| Dsn.go:47:10:47:30 | call to FormValue | Dsn.go:49:102:49:105 | name | provenance | Src:MaD:667 |
| Dsn.go:49:11:49:106 | []type{args} [array] | Dsn.go:49:11:49:106 | call to Sprintf | provenance | MaD:242 |
| Dsn.go:47:10:47:30 | call to FormValue | Dsn.go:49:102:49:105 | name | provenance | Src:MaD:670 |
| Dsn.go:49:11:49:106 | []type{args} [array] | Dsn.go:49:11:49:106 | call to Sprintf | provenance | MaD:245 |
| Dsn.go:49:11:49:106 | call to Sprintf | Dsn.go:50:29:50:33 | dbDSN | provenance | |
| Dsn.go:49:102:49:105 | name | Dsn.go:49:11:49:106 | []type{args} [array] | provenance | |
| Dsn.go:49:102:49:105 | name | Dsn.go:49:11:49:106 | call to Sprintf | provenance | FunctionModel |
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4 changes: 2 additions & 2 deletions go/ql/test/experimental/CWE-74/DsnInjectionLocal.expected
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@@ -1,6 +1,6 @@
edges
| Dsn.go:26:11:26:17 | selection of Args | Dsn.go:28:102:28:109 | index expression | provenance | |
| Dsn.go:28:11:28:110 | []type{args} [array] | Dsn.go:28:11:28:110 | call to Sprintf | provenance | MaD:242 |
| Dsn.go:28:11:28:110 | []type{args} [array] | Dsn.go:28:11:28:110 | call to Sprintf | provenance | MaD:245 |
| Dsn.go:28:11:28:110 | call to Sprintf | Dsn.go:29:29:29:33 | dbDSN | provenance | |
| Dsn.go:28:102:28:109 | index expression | Dsn.go:28:11:28:110 | []type{args} [array] | provenance | |
| Dsn.go:28:102:28:109 | index expression | Dsn.go:28:11:28:110 | call to Sprintf | provenance | FunctionModel |
Expand All @@ -12,7 +12,7 @@ edges
| Dsn.go:63:9:63:11 | implicit dereference | Dsn.go:67:102:67:108 | selection of dsn | provenance | |
| Dsn.go:63:19:63:25 | selection of Args | Dsn.go:63:19:63:29 | slice expression | provenance | |
| Dsn.go:63:19:63:29 | slice expression | Dsn.go:63:9:63:11 | implicit dereference | provenance | FunctionModel |
| Dsn.go:67:11:67:109 | []type{args} [array] | Dsn.go:67:11:67:109 | call to Sprintf | provenance | MaD:242 |
| Dsn.go:67:11:67:109 | []type{args} [array] | Dsn.go:67:11:67:109 | call to Sprintf | provenance | MaD:245 |
| Dsn.go:67:11:67:109 | call to Sprintf | Dsn.go:68:29:68:33 | dbDSN | provenance | |
| Dsn.go:67:102:67:104 | cfg [pointer] | Dsn.go:67:102:67:104 | implicit dereference | provenance | |
| Dsn.go:67:102:67:104 | implicit dereference | Dsn.go:63:9:63:11 | implicit dereference | provenance | |
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