hohn/codeql
1
0
Fork 0
mirror of https://github.com/github/codeql.git synced 2025-12-24 04:36:35 +01:00
Code Issues Packages Projects Releases Wiki Activity

Python: Refactor SaxParserSetFeatureCall

Browse Source 
Originally made by @erik-krogh in
https://github.com/github/codeql/pull/8693/files#diff-9627c1fb9a1cc77fb93e6b7e31af1a4fa908f2a60362cfb34377d24debb97398

Could not be applied directly to this PR, since this PR deletes the file.
This commit is contained in:
Rasmus Wriedt Larsen
2022-05-02 11:29:00 +02:00
parent 5f01fc24e4
commit 714465bf39
1 changed files with 7 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
python/ql/lib/semmle/python/frameworks/Stdlib.qll
View File

@@ -3408,7 +3408,7 @@ private module StdlibPrivate {
* *
* See https://docs.python.org/3.10/library/xml.sax.reader.html#xml.sax.xmlreader.XMLReader.setFeature * See https://docs.python.org/3.10/library/xml.sax.reader.html#xml.sax.xmlreader.XMLReader.setFeature
*/ */
private class SaxParserSetFeatureCall extends DataFlow::MethodCallNode { private class SaxParserSetFeatureCall extends API::CallNode, DataFlow::MethodCallNode {
SaxParserSetFeatureCall() { SaxParserSetFeatureCall() {
this = this =
API::moduleImport("xml") API::moduleImport("xml")
@@ -3421,27 +3421,9 @@ private module StdlibPrivate {
// The keyword argument names does not match documentation. I checked (with Python // The keyword argument names does not match documentation. I checked (with Python
// 3.9.5) that the names used here actually works. // 3.9.5) that the names used here actually works.
DataFlow::Node getFeatureArg() { result in [this.getArg(0), this.getArgByName("name")] } API::Node getFeatureArg() { result = this.getParameter(0, "name") }
DataFlow::Node getStateArg() { result in [this.getArg(1), this.getArgByName("state")] } API::Node getStateArg() { result = this.getParameter(1, "state") }
}
/** Gets a back-reference to the `setFeature` state argument `arg`. */
private DataFlow::TypeTrackingNode saxParserSetFeatureStateArgBacktracker(
DataFlow::TypeBackTracker t, DataFlow::Node arg
) {
t.start() and
arg = any(SaxParserSetFeatureCall c).getStateArg() and
result = arg.getALocalSource()
or
exists(DataFlow::TypeBackTracker t2 |
result = saxParserSetFeatureStateArgBacktracker(t2, arg).backtrack(t2, t)
)
}
/** Gets a back-reference to the `setFeature` state argument `arg`. */
DataFlow::LocalSourceNode saxParserSetFeatureStateArgBacktracker(DataFlow::Node arg) {
result = saxParserSetFeatureStateArgBacktracker(DataFlow::TypeBackTracker::end(), arg)
} }
/** /**
@@ -3452,16 +3434,13 @@ private module StdlibPrivate {
private DataFlow::Node saxParserWithFeatureExternalGesTurnedOn(DataFlow::TypeTracker t) { private DataFlow::Node saxParserWithFeatureExternalGesTurnedOn(DataFlow::TypeTracker t) {
t.start() and t.start() and
exists(SaxParserSetFeatureCall call | exists(SaxParserSetFeatureCall call |
call.getFeatureArg() = call.getFeatureArg().getARhs() =
API::moduleImport("xml") API::moduleImport("xml")
.getMember("sax") .getMember("sax")
.getMember("handler") .getMember("handler")
.getMember("feature_external_ges") .getMember("feature_external_ges")
.getAUse() and .getAUse() and
saxParserSetFeatureStateArgBacktracker(call.getStateArg()) call.getStateArg().getAValueReachingRhs().asExpr().(BooleanLiteral).booleanValue() = true and
.asExpr()
.(BooleanLiteral)
.booleanValue() = true and
result = call.getObject() result = call.getObject()
) )
or or
@@ -3471,16 +3450,13 @@ private module StdlibPrivate {
// take account of that we can set the feature to False, which makes the parser safe again // take account of that we can set the feature to False, which makes the parser safe again
not exists(SaxParserSetFeatureCall call | not exists(SaxParserSetFeatureCall call |
call.getObject() = result and call.getObject() = result and
call.getFeatureArg() = call.getFeatureArg().getARhs() =
API::moduleImport("xml") API::moduleImport("xml")
.getMember("sax") .getMember("sax")
.getMember("handler") .getMember("handler")
.getMember("feature_external_ges") .getMember("feature_external_ges")
.getAUse() and .getAUse() and
saxParserSetFeatureStateArgBacktracker(call.getStateArg()) call.getStateArg().getAValueReachingRhs().asExpr().(BooleanLiteral).booleanValue() = false
.asExpr()
.(BooleanLiteral)
.booleanValue() = false
) )
} }