NDLI: Sound Modular Verification of C Code Executing in an Unverified Context

Content Provider	ACM Digital Library
Author	Piessens, Frank Agten, Pieter Jacobs, Bart
Abstract	Over the past decade, great progress has been made in the static modular verification of C code by means of separation logic-based program logics. However, the runtime guarantees offered by such verification are relatively limited when the verified modules are part of a whole program that also contains unverified modules. In particular, a memory safety error in an unverified module can corrupt the runtime state, leading to assertion failures or invalid memory accesses in the verified modules. This paper develops runtime checks to be inserted at the boundary between the verified and the unverified part of a program, to guarantee that no assertion failures or invalid memory accesses can occur at runtime in any verified module. One of the key challenges is enforcing the separation logic frame rule, which we achieve by checking the integrity of the footprint of the verified part of the program on each control flow transition from the unverified to the verified part. This in turn requires the presence of some support for module-private memory at runtime. We formalize our approach and prove soundness. We implement the necessary runtime checks by means of a program transformation that translates C code with separation logic annotations into plain C, and that relies on a protected module architecture for providing module-private memory and restricted module entry points. Benchmarks show the performance impact of this transformation depends on the choice of boundary between the verified and unverified parts of the program, but is below 4% for real-world applications.
Starting Page	581
Ending Page	594
Page Count	14
File Format	PDF
ISSN	03621340 15581160
DOI	10.1145/2775051.2676972
Journal	ACM SIGPLAN Notices (SIGP)
Volume Number	50
Issue Number	1
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1983-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Separation logic Runtime checking Verification
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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