Comments (2)
⌨️ Activity: Find all the calls to memcpy
- Edit the file
6_memcpy_calls.ql
- Use the auto-completion feature to find the class that represents function calls, and declare a variable that belongs to this class.
- Use auto-completion again on your function call variable to guess the predicate that tells us the target function that is being called.
- Combine this with your logic from step 4 to make sure the target function is named
memcpy
. - Once you're happy with the results, submit your solution.
Tip: You can have a look at this C++ example in the CodeQL cookbook. Note that your query will be simpler as you won't need to consider the declaringType
.
Note: Once you have good results, you can try to make your query more compact by omitting the intermediate Function
variable. The 2 queries below are equivalent:
from Class1 c1, Class2 c2
where
c1.getClass2() = c2 and
c2.getProp() = "something"
select c1
from Class1 c1
where c1.getClass2().getProp() = "something"
select c1
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Congratulations, looks like the query you introduced in 3698443 finds the correct results!
If you created a pull request, merge it.
Let's continue to the next step.
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Related Issues (10)
- Step 1 - Welcome to the course! HOT 1
- Step 2 - Set up your IDE HOT 2
- Step 3 - Your first query HOT 3
- Step 4 - Anatomy of a query HOT 2
- Step 5 - Using different classes and their predicates HOT 2
- Step 7 - Relating two variables, continued HOT 2
- Step 8 - Changing the selected output HOT 2
- Step 9 - Write your own class HOT 3
- Step 10 - Data flow and taint tracking analysis HOT 2
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