[pull] main from github:main #154
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…implement. Queries / tests that required changes: * The CleartextLogging and MissingErrorCheck queries are updated because they assumed def-use flow * The CommandInjection query works around the shortcomings of use-use flow by essentially reintroducing def-use flow when it applies a sanitizer * The OpenUrlRedirect query currently just accepts its fate; the tests are updated to avoid excess sanitization while the query comments on the problem. We should choose this approach or the CommandInjection one.
No changes in functionality.
Without this change the test go/ql/test/query-tests/InconsistentCode/UnhandledCloseWritableHandle/UnhandledCloseWritableHandle.qlref was failing.
Make it sanitize the result of the call rather than the input, so that
further uses of the input are still tainted. This means that it catches
things like `log.Print(fmt.Sprintf("user %q logged in.\n", username))`
where the argument to the LoggerCall contains a StringFormatCall, but
it misses things like `log.Printf("user %q logged in.\n", username)`. So
we extract the logic into a predicate and apply it as a condition in the
sink as well.
The downside of this approach is that if there are two tainted inputs
and only one has a safe format argument then we still sanitize the
result. Hopefully this is rare.
We have an operator expression like `x * 5`. We want to follow where the value of the operator expression goes. We used to follow local flow from an operand, but now there is flow from that operand to the next use of the variable. The fix is to explicitly start local flow from the operator expression. There are also some expected edge changes due to use-use flow.
We were assuming that `sink` only had one successor, the TypeCastNode, but it can now have an adjacent use as well.
Note that we don't create post-update nodes for method receivers if the call to the method is indirect, via a function variable. We could aim to do this in future.
These sources are now modeled using models-as-data, which (probably correctly) uses the post-update node as the source. But the deprecated QL models still exist, so we get two test results for each of these calls.
One spurious alert was removed, one missing alert was added, and some source locations changed.
This can be easily expressed in terms of `WriteNode.writesFieldPreUpdate`.
When tracing back from nil checks on interfaces, ignore post-update nodes. There will always be a corresponding pre-update node that contains the information we want.
…heckReturnNull.qll:
Evaluated non-recursive predicate Element::Element.getFile/0#dispred#536cb5f3#bb@f6f5329i in 182326ms (size: 50437).
Evaluated relational algebra for predicate Element::Element.getFile/0#dispred#536cb5f3#bb@f6f5329i with tuple counts:
2029351 ~0% {2} r1 = SCAN `Expr::Expr.getLocation/0#dispred#0a3d90c6` OUTPUT In.1, In.0
2029351 ~0% {2} | JOIN WITH `Location::Location.getStartLine/0#d54f9e6c` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
1168789 ~0% {2} | JOIN WITH `InconsistentCheckReturnNull::assertInvocation/2#b2a4c9e3_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
5533128288 ~0% {3} | JOIN WITH `Location::Location.getContainer/0#9edabfb6_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.0
50413 ~0% {2} | JOIN WITH `Element::Element.getLocation/0#dispred#6c3f5b09#bf` ON FIRST 2 OUTPUT Lhs.0, Lhs.2
3043 ~0% {2} r2 = JOIN `project#InconsistentCheckReturnNull::relevantFunctionCall/2#d18cd566` WITH `Expr::Expr.getLocation/0#dispred#0a3d90c6` ON FIRST 1 OUTPUT Rhs.1, Lhs.0
3043 ~0% {2} r3 = JOIN r2 WITH locations_default ON FIRST 1 OUTPUT Rhs.4, Lhs.1
1945 ~3% {2} | JOIN WITH `InconsistentCheckReturnNull::assertInvocation/2#b2a4c9e3_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
9106248 ~2% {3} | JOIN WITH `Location::Location.getContainer/0#9edabfb6_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.0
0 ~0% {2} | JOIN WITH `Element::Element.getLocation/0#dispred#6c3f5b09#bf` ON FIRST 2 OUTPUT Lhs.0, Lhs.2
3043 ~0% {3} r4 = JOIN r2 WITH locations_default ON FIRST 1 OUTPUT _, Lhs.1, Rhs.4
3043 ~0% {2} | REWRITE WITH Tmp.0 := 1, Out.0 := (In.2 + Tmp.0) KEEPING 2
2013 ~0% {2} | JOIN WITH `InconsistentCheckReturnNull::assertInvocation/2#b2a4c9e3_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
9621327 ~0% {3} | JOIN WITH `Location::Location.getContainer/0#9edabfb6_10#join_rhs` ON FIRST 1 OUTPUT Lhs.1, Rhs.1, Lhs.0
24 ~3% {2} | JOIN WITH `Element::Element.getLocation/0#dispred#6c3f5b09#bf` ON FIRST 2 OUTPUT Lhs.0, Lhs.2
50437 ~0% {2} r5 = r1 UNION r3 UNION r4
return r5
Go: Switch from def-use flow to use-use flow
C++: Fix bad magic on `Element.getFile`
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