Efficient software-based fault isolation
SOSP '93 Proceedings of the fourteenth ACM symposium on Operating systems principles
Sharing and protection in a single-address-space operating system
ACM Transactions on Computer Systems (TOCS) - Special issue on computer architecture
Exokernel: an operating system architecture for application-level resource management
SOSP '95 Proceedings of the fifteenth ACM symposium on Operating systems principles
Extensibility safety and performance in the SPIN operating system
SOSP '95 Proceedings of the fifteenth ACM symposium on Operating systems principles
UNIX internals: the new frontiers
UNIX internals: the new frontiers
Programming with POSIX threads
Programming with POSIX threads
The Java programming language (2nd ed.)
The Java programming language (2nd ed.)
Mobile Agents: Are They a Good Idea?
MOS '96 Selected Presentations and Invited Papers Second International Workshop on Mobile Object Systems - Towards the Programmable Internet
Implementing multiple protection domains in java
ATEC '98 Proceedings of the annual conference on USENIX Annual Technical Conference
Protected shared libraries: a new approach to modularity and sharing
ATEC '97 Proceedings of the annual conference on USENIX Annual Technical Conference
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There is increasing interest in extensible systems (such as extensible operating systems, mobile code runtime systems, Internet browsers and servers) that allow external programs to be downloaded and executed directly within the system. While appealing from system design and extensibility points of view, extensible systems are vulnerable to aberrant beha viors of external programs. External programs can in terfere with executions of other programs by reading and writing into their memory locations. In this paper, we present an approach for providing safe execution of external programs through a safe threads mechanism. The approach also provides a novel technique for safe sharing among external programs. The paper also describes the design and implementation of the safe threads.