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Annex K of C11, bounds-checking interfaces, recently introduced a set ofalternative functions to mitigate buffer overflows, primarily those caused bystring/memory functions. However, poor compatibility limits their adoption.Failure oblivious computing can eliminate the possibility that an attacker canexploit memory errors to corrupt the address space and significantly increasethe availability of systems.  In this paper, we present S3Library (Saturation-Memory-Access Safer StringLibrary), which is compatible with the standard C library in terms of functionsignature. Our technique automatically replaces unsafe deprecated memory/stringfunctions with safer versions that perform bounds checking and eliminate bufferoverflows via boundless memory. S3Library employs MinFat, a very compactpointer representation following the Less is More principle, to encode metadatainto unused upper bits within pointers. In addition, S3Library utilizesSaturation Memory Access to eliminate illegal memory accesses into boundlesspadding area. Even if an out-of-bounds access is made, the fault program willnot be interrupted. We implement our scheme within the LLVM framework on X86-64and evaluate our approach on correctness, security, runtime performance andavailability.

S3Library: Automatically Eliminating C/C++ Buffer Overflow using Compatible Safer Libraries