Cross-function union instrumentation #3465
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artemagvanian
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Aug 27, 2024
celinval
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Aug 30, 2024
celinval
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Aug 30, 2024
kani-compiler/src/kani_middle/transform/check_uninit/ptr_uninit/uninit_visitor.rs
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kani-compiler/src/kani_middle/transform/check_uninit/ptr_uninit/uninit_visitor.rs
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kani-compiler/src/kani_middle/transform/check_uninit/ptr_uninit/uninit_visitor.rs
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kani-compiler/src/kani_middle/transform/check_uninit/relevant_instruction.rs
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This PR introduces support for memory initialization checks for unions passed across the function boundary.
Whenever a union is passed as an argument, we need to make sure that its initialization state is preserved. Unlike pointers, unions do not have a stable memory address which could identify them in shadow memory. Hence, we need to pass extra information across function boundary since unions are passed “by value”.
We introduce a global variable to store the previous address of unions passed as function arguments, which allows us to effectively tie the initialization state of unions passed between functions. This struct is written to by the caller and read from by the callee.
For more information about planned functionality, see #3300
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.