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Python: Use DefinitionNode instead of Assign

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Based on https://github.com/github/codeql/pull/6155#discussion_r660964666:

> Hmm... Would it be better to do this using DefinitionNode instead of
> Assign? The latter is fairly limited in what it can represent, and also
> raises questions of whether this definition is sound with regard to
> control-flow splitting.
This commit is contained in:
Rasmus Wriedt Larsen
2021-06-30 12:07:56 +02:00
parent 94bcda3bae
commit e5d65992b4
2 changed files with 18 additions and 18 deletions
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16
python/ql/src/semmle/python/frameworks/Aiohttp.qll
View File

@@ -645,16 +645,14 @@ module AiohttpWebModel {
DataFlow::Node value;
AiohttpResponseCookieSubscriptWrite() {
exists(Assign assign, Subscript subscript |
// Since there is no `DataFlow::Node` for the assign (since it's a statement,
// and not an expression) there doesn't seem to be any _good_ choice for `this`,
// so just picking the whole subscript...
this.asExpr() = subscript
exists(SubscriptNode subscript |
// To give `this` a value, we need to choose between either LHS or RHS,
// and just go with the LHS
this.asCfgNode() = subscript
|
assign.getATarget() = subscript and
subscript.getObject() = aiohttpResponseInstance().getMember("cookies").getAUse().asExpr() and
index.asExpr() = subscript.getIndex() and
value.asExpr() = assign.getValue()
subscript.getObject() = aiohttpResponseInstance().getMember("cookies").getAUse().asCfgNode() and
value.asCfgNode() = subscript.(DefinitionNode).getValue() and
index.asCfgNode() = subscript.getIndex()
)
}

20
python/ql/src/semmle/python/frameworks/Django.qll
View File

@@ -1412,18 +1412,20 @@ private module PrivateDjango {
DataFlow::Node value;
DjangoResponseCookieSubscriptWrite() {
exists(Assign assign, Subscript subscript, DataFlow::AttrRead cookieLookup |
// Since there is no `DataFlow::Node` for the assign (since it's a statement,
// and not an expression) there doesn't seem to be any _good_ choice for `this`,
// so just picking the whole subscript...
this.asExpr() = subscript
exists(SubscriptNode subscript, DataFlow::AttrRead cookieLookup |
// To give `this` a value, we need to choose between either LHS or RHS,
// and just go with the LHS
this.asCfgNode() = subscript
|
cookieLookup.getAttributeName() = "cookies" and
cookieLookup.getObject() = django::http::response::HttpResponse::instance() and
assign.getATarget() = subscript and
cookieLookup.flowsTo(DataFlow::exprNode(subscript.getObject())) and
index.asExpr() = subscript.getIndex() and
value.asExpr() = assign.getValue()
exists(DataFlow::Node subscriptObj |
subscriptObj.asCfgNode() = subscript.getObject()
|
cookieLookup.flowsTo(subscriptObj)
) and
value.asCfgNode() = subscript.(DefinitionNode).getValue() and
index.asCfgNode() = subscript.getIndex()
)
}