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Heap recover e signature

hello everyone my name is jen lin i'm from singapore management university now i will introduce our work called main function signature recovery with compiler optimization as we know an accurate cfi policy is a pure request to cf enforcement most approaches rely on the availability of source code to get this kind of policy such as modular a5 pi cfi and the forward cfi however current battery level c5 techniques are fake in recovering the set of valid targets indirect bond transfers this is because the campaigner will not preserve a lot of language level information such as the type information in the process of compilation two approaches are proposed to recover the function signatures through static analytical analysis under the recovered function signature can be used to help cfi enforcement these two approaches are type armor and tau c5 which recovers the number of arguments and risks of argument storing registers for example for this indirect corner the recovered number of arguments is three and the recovered argument base is certainly bid for each of them according to the recovery function signature we can find the valid target for this entire corner can only be the first and the third functions since the argument was for the second function is six four bits which is larger than zero two bits it cannot be the valid target of this interior corner these two approaches rely on cooling convention in linux 6 4 bit to recover the function signature in which integer arguments are passed in six argument registers and they will collect state information on these six argument registers at the quality and the indirect corner sites specifically at is a quality site the forward recursive analysis is performed from the entry basic block and at the indirect corner site backward analysis is performed they both assume that the argument registers are always reset between two function cores so the analysis is terminated when a return age is encountered i will use an example to show how the number of arguments and argument rates are recovered in this example from the source code we can find it has four arguments after compilation from the binary we can find six four bits of the first four argument registers already so current approaches conclude that this colleague has four arguments and the base for each argument is six four bits but from the source code we can find the type for the first argument is unsigned inst which is third 32 bits rather than 6 4 bits it means the recover function signature from the banner is different from the source code this is because during the compilation the compiler optimization has a great impact on the function signature we find eight ways in which compiler optimization will impact the function signature recovery we call each of them as a complication case due to time limitation i will only introduce two of them in detail if you are interested in other...