The Meaning of Memory Safety

We give a rigorous characterization of what it means for a programming language to be memory safe, capturing the intuition that memory safety supports local reasoning about state. We formalize this principle in two ways. First, we show how a small memory-safe language validates a noninterference property: a program can neither affect nor be affected by unreachable parts of the state. Second, we extend separation logic, a proof system for heap-manipulating programs, with a memory-safe variant of its frame rule. The new rule is stronger because it applies even when parts of the program are buggy or malicious, but also weaker because it demands a stricter form of separation between parts of the program state. We also consider a number of pragmatically motivated variations on memory safety and the reasoning principles they support. As an application of our characterization, we evaluate the security of a previously proposed dynamic monitor for memory safety of heap-allocated data.Comment: POST'18 final versio

Computer simulation model of terminal air traffic and PWI systems, phase 1

Collision avoidance computer simulation model of terminal air traffic and proximity warning indicator system

MP2-F12 Basis Set Convergence for the S66 Noncovalent Interactions Benchmark: Transferability of the Complementary Auxiliary Basis Set (CABS)

Complementary auxiliary basis sets for F12 explicitly correlated calculations appear to be more transferable between orbital basis sets than has been generally assumed. We also find that aVnZ-F12 basis sets, originally developed with anionic systems in mind, appear to be superior for noncovalent interactions as well, and propose a suitable CABS sequence for them.Comment: AIP Conference Proceedings, in press (ICCMSE-2017 proceedings), 4 page

Títulos hipotecarios de los Estados Unidos:Estudios de las características del mercado e instrumentos

El Objetivo de este documento es el de estudiartangto las características de retorno y riesgo de los Títulos Respaldado en Hipotecas (MBS por sus siglas en ingles - Mortgage-Backed Segurities, así como el análisis del mercado hipotecario de los Estados Unidos

Títulos hipotecarios de los Estados Unidos: Estudios de las características del mercado e instrumentos

El Objetivo de este documento es el de estudiar tanto las características de retorno y riesgo de los Títulos Respaldado en Hipotecas (MBS por sus siglas en ingles Mortgage-Backed Segurities, así como el análisis del mercado hipotecario de los Estados Unidos.