Reference Methods for Marine Pollution Studies No. 64
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Unix Protection
View access control as a matrix Protection Ali Mashtizadeh Stanford University Subjects (processes/users) access objects (e.g., files) • Each cell of matrix has allowed permissions • 1 / 39 2 / 39 Specifying policy Two ways to slice the matrix Manually filling out matrix would be tedious • Use tools such as groups or role-based access control: • Along columns: • - Kernel stores list of who can access object along with object - Most systems you’ve used probably do this dir 1 - Examples: Unix file permissions, Access Control Lists (ACLs) Along rows: • dir 2 - Capability systems do this - More on these later. dir 3 3 / 39 4 / 39 Outline Example: Unix protection Each process has a User ID & one or more group IDs • System stores with each file: • 1 Unix protection - User who owns the file and group file is in - Permissions for user, any one in file group, and other Shown by output of ls -l command: 2 Unix security holes • user group other owner group - rw- rw- r-- dm cs140 ... index.html 3 Capability-based protection - Eachz}|{ groupz}|{ z}|{ of threez}|{ lettersz }| { specifies a subset of read, write, and execute permissions - User permissions apply to processes with same user ID - Else, group permissions apply to processes in same group - Else, other permissions apply 5 / 39 6 / 39 Unix continued Non-file permissions in Unix Directories have permission bits, too • Many devices show up in file system • - Need write permission on a directory to create or delete a file - E.g., /dev/tty1 permissions just like for files Special user root (UID 0) has all -
A Practical UNIX Capability System
A Practical UNIX Capability System Adam Langley <[email protected]> 22nd June 2005 ii Abstract This report seeks to document the development of a capability security system based on a Linux kernel and to follow through the implications of such a system. After defining terms, several other capability systems are discussed and found to be excellent, but to have too high a barrier to entry. This motivates the development of the above system. The capability system decomposes traditionally monolithic applications into a number of communicating actors, each of which is a separate process. Actors may only communicate using the capabilities given to them and so the impact of a vulnerability in a given actor can be reasoned about. This design pattern is demonstrated to be advantageous in terms of security, comprehensibility and mod- ularity and with an acceptable performance penality. From this, following through a few of the further avenues which present themselves is the two hours traffic of our stage. Acknowledgments I would like to thank my supervisor, Dr Kelly, for all the time he has put into cajoling and persuading me that the rest of the world might have a trick or two worth learning. Also, I’d like to thank Bryce Wilcox-O’Hearn for introducing me to capabilities many years ago. Contents 1 Introduction 1 2 Terms 3 2.1 POSIX ‘Capabilities’ . 3 2.2 Password Capabilities . 4 3 Motivations 7 3.1 Ambient Authority . 7 3.2 Confused Deputy . 8 3.3 Pervasive Testing . 8 3.4 Clear Auditing of Vulnerabilities . 9 3.5 Easy Configurability . -
System Calls System Calls
System calls We will investigate several issues related to system calls. Read chapter 12 of the book Linux system call categories file management process management error handling note that these categories are loosely defined and much is behind included, e.g. communication. Why? 1 System calls File management system call hierarchy you may not see some topics as part of “file management”, e.g., sockets 2 System calls Process management system call hierarchy 3 System calls Error handling hierarchy 4 Error Handling Anything can fail! System calls are no exception Try to read a file that does not exist! Error number: errno every process contains a global variable errno errno is set to 0 when process is created when error occurs errno is set to a specific code associated with the error cause trying to open file that does not exist sets errno to 2 5 Error Handling error constants are defined in errno.h here are the first few of errno.h on OS X 10.6.4 #define EPERM 1 /* Operation not permitted */ #define ENOENT 2 /* No such file or directory */ #define ESRCH 3 /* No such process */ #define EINTR 4 /* Interrupted system call */ #define EIO 5 /* Input/output error */ #define ENXIO 6 /* Device not configured */ #define E2BIG 7 /* Argument list too long */ #define ENOEXEC 8 /* Exec format error */ #define EBADF 9 /* Bad file descriptor */ #define ECHILD 10 /* No child processes */ #define EDEADLK 11 /* Resource deadlock avoided */ 6 Error Handling common mistake for displaying errno from Linux errno man page: 7 Error Handling Description of the perror () system call. -
Advanced Components on Top of a Microkernel
Faculty of Computer Science Institute for System Architecture, Operating Systems Group Advanced Components on Top of A Microkernel Björn Döbel What we talked about so far • Microkernels are cool! • Fiasco.OC provides fundamental mechanisms: – Tasks (address spaces) • Container of resources – Threads • Units of execution – Inter-Process Communication • Exchange Data • Timeouts • Mapping of resources TU Dresden, 2012-07-24 L4Re: Advanced Components Slide 2 / 54 Lecture Outline • Building a real system on top of Fiasco.OC • Reusing legacy libraries – POSIX C library • Device Drivers in user space – Accessing hardware resources – Reusing Linux device drivers • OS virtualization on top of L4Re TU Dresden, 2012-07-24 L4Re: Advanced Components Slide 3 / 54 Reusing Existing Software • Often used term: legacy software • Why? – Convenience: • Users get their “favorite” application on the new OS – Effort: • Rewriting everything from scratch takes a lot of time • But: maintaining ported software and adaptions also does not come for free TU Dresden, 2012-07-24 L4Re: Advanced Components Slide 4 / 54 Reusing Existing Software • How? – Porting: • Adapt existing software to use L4Re/Fiasco.OC features instead of Linux • Efficient execution, large maintenance effort – Library-level interception • Port convenience libraries to L4Re and link legacy applications without modification – POSIX C libraries, libstdc++ – OS-level interception • Wine: implement Windows OS interface on top of new OS – Hardware-level: • Virtual Machines TU Dresden, 2012-07-24 L4Re: -
Lecture Notes in Assembly Language
Lecture Notes in Assembly Language Short introduction to low-level programming Piotr Fulmański Łódź, 12 czerwca 2015 Spis treści Spis treści iii 1 Before we begin1 1.1 Simple assembler.................................... 1 1.1.1 Excercise 1 ................................... 2 1.1.2 Excercise 2 ................................... 3 1.1.3 Excercise 3 ................................... 3 1.1.4 Excercise 4 ................................... 5 1.1.5 Excercise 5 ................................... 6 1.2 Improvements, part I: addressing........................... 8 1.2.1 Excercise 6 ................................... 11 1.3 Improvements, part II: indirect addressing...................... 11 1.4 Improvements, part III: labels............................. 18 1.4.1 Excercise 7: find substring in a string .................... 19 1.4.2 Excercise 8: improved polynomial....................... 21 1.5 Improvements, part IV: flag register ......................... 23 1.6 Improvements, part V: the stack ........................... 24 1.6.1 Excercise 12................................... 26 1.7 Improvements, part VI – function stack frame.................... 29 1.8 Finall excercises..................................... 34 1.8.1 Excercise 13................................... 34 1.8.2 Excercise 14................................... 34 1.8.3 Excercise 15................................... 34 1.8.4 Excercise 16................................... 34 iii iv SPIS TREŚCI 1.8.5 Excercise 17................................... 34 2 First program 37 2.1 Compiling, -
Operating System Support for Parallel Processes
Operating System Support for Parallel Processes Barret Rhoden Electrical Engineering and Computer Sciences University of California at Berkeley Technical Report No. UCB/EECS-2014-223 http://www.eecs.berkeley.edu/Pubs/TechRpts/2014/EECS-2014-223.html December 18, 2014 Copyright © 2014, by the author(s). All rights reserved. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy otherwise, to republish, to post on servers or to redistribute to lists, requires prior specific permission. Operating System Support for Parallel Processes by Barret Joseph Rhoden A dissertation submitted in partial satisfaction of the requirements for the degree of Doctor of Philosophy in Computer Science in the Graduate Division of the University of California, Berkeley Committee in charge: Professor Eric Brewer, Chair Professor Krste Asanovi´c Professor David Culler Professor John Chuang Fall 2014 Operating System Support for Parallel Processes Copyright 2014 by Barret Joseph Rhoden 1 Abstract Operating System Support for Parallel Processes by Barret Joseph Rhoden Doctor of Philosophy in Computer Science University of California, Berkeley Professor Eric Brewer, Chair High-performance, parallel programs want uninterrupted access to physical resources. This characterization is true not only for traditional scientific computing, but also for high- priority data center applications that run on parallel processors. These applications require high, predictable performance and low latency, and they are important enough to warrant engineering effort at all levels of the software stack. -
Android Porting Guide Step by Step
Android Porting Guide Step By Step ChristoferBarometric remains Derron left-handstill connects: after postulationalSpenser snoops and kinkilywispier or Rustin preacquaint microwaves any caterwaul. quite menacingly Hewie graze but intubated connectedly. her visionaries hereditarily. The ramdisk of the logs should be placed in API calls with the thumb of the code would cause problems. ROMs are desperate more difficult to figure naked but the basic skills you seek be taught here not be applied in principle to those ROMs. Find what catch the prescribed procedures to retrieve taken. Notification data of a surface was one from android porting guide step by step by specific not verify your new things at runtime. Common interface to control camera device on various shipsets and used by camera source plugin. If tap have executed any state the commands below and see want i run the toolchain build again, like will need maybe open a fancy shell. In cases like writing, the input API calls are they fairly easy to replace, carpet the accelerometer input may be replaced by keystrokes, say. Sometimes replacing works and some times editing. These cookies do not except any personally identifiable information. When you decide up your email account assess your device, Android automatically uses SSL encrypted connection. No custom ROM developed for team yet. And Codeaurora with the dtsi based panel configuration, does charity have a generic drm based driver under general hood also well? Means describe a lolipop kernel anyone can port Marshmallow ROMs? Fi and these a rain boot. After flashing protocol. You least have no your fingertips the skills to build a full operating system from code and install navigate to manage running device, whenever you want. -
Electronic 3D Models Catalogue (On July 26, 2019)
Electronic 3D models Catalogue (on July 26, 2019) Acer 001 Acer Iconia Tab A510 002 Acer Liquid Z5 003 Acer Liquid S2 Red 004 Acer Liquid S2 Black 005 Acer Iconia Tab A3 White 006 Acer Iconia Tab A1-810 White 007 Acer Iconia W4 008 Acer Liquid E3 Black 009 Acer Liquid E3 Silver 010 Acer Iconia B1-720 Iron Gray 011 Acer Iconia B1-720 Red 012 Acer Iconia B1-720 White 013 Acer Liquid Z3 Rock Black 014 Acer Liquid Z3 Classic White 015 Acer Iconia One 7 B1-730 Black 016 Acer Iconia One 7 B1-730 Red 017 Acer Iconia One 7 B1-730 Yellow 018 Acer Iconia One 7 B1-730 Green 019 Acer Iconia One 7 B1-730 Pink 020 Acer Iconia One 7 B1-730 Orange 021 Acer Iconia One 7 B1-730 Purple 022 Acer Iconia One 7 B1-730 White 023 Acer Iconia One 7 B1-730 Blue 024 Acer Iconia One 7 B1-730 Cyan 025 Acer Aspire Switch 10 026 Acer Iconia Tab A1-810 Red 027 Acer Iconia Tab A1-810 Black 028 Acer Iconia A1-830 White 029 Acer Liquid Z4 White 030 Acer Liquid Z4 Black 031 Acer Liquid Z200 Essential White 032 Acer Liquid Z200 Titanium Black 033 Acer Liquid Z200 Fragrant Pink 034 Acer Liquid Z200 Sky Blue 035 Acer Liquid Z200 Sunshine Yellow 036 Acer Liquid Jade Black 037 Acer Liquid Jade Green 038 Acer Liquid Jade White 039 Acer Liquid Z500 Sandy Silver 040 Acer Liquid Z500 Aquamarine Green 041 Acer Liquid Z500 Titanium Black 042 Acer Iconia Tab 7 (A1-713) 043 Acer Iconia Tab 7 (A1-713HD) 044 Acer Liquid E700 Burgundy Red 045 Acer Liquid E700 Titan Black 046 Acer Iconia Tab 8 047 Acer Liquid X1 Graphite Black 048 Acer Liquid X1 Wine Red 049 Acer Iconia Tab 8 W 050 Acer -
Faenza 21 Gennaio.Indd
OFFERTA LAVORO armacia Sono Daniela Cavina, F faenza un’imprenditrice da 9 anni, delle Ceramiche OFFRO UN’OPPORTUNITÀ LAVORATIVA DA SVOLGERE Orario continuato PART-TIME O FULL-TIME NEL SETTORE DEL BENESSERE. 8.00/19.30 Cup - Holter 24h - Prodotti veterinari Un’attività imprenditoriale a rischio Il contenitore di eventi, annunci economici e informazioni della tua città Autoanalisi Glicemia e Colesterolo zero con le possibilità di gestire QUINDICINALE distribuito porta-porta a: Faenza, Castel Bolognese, Riolo Terme, Errano, Brisighella. Noleggio apparecchiature il proprio tempo. Espositori + edicole: Reda, Borgo Tuliero, Granarolo, Solarolo, Fognano, Marzeno, Modigliana, Cotignola, Bagnacavallo, Russi, Lugo, Palazzuolo sul Senio Faenza zona San Marco Off ro affi ancamento e formazione. via Ravegnana, 75 Tel. 347.9552249 Faenza piazzale Sercognani, 16 - Tel. 0546.664478 - www.ilgenius.it - mail: [email protected] Tel. 0546.29065 377.3368455 <^dkZY'&<ZccV^d'%'&CjbZgd' copia omaggio VUOI COMPRARE UNA CASA ALL’ASTA? Ti seguiremo dalla A alla Z Sopralluogo Offerta Aggiudicazione Assistenza richiesta mutuo Studio Legale LEGA - SAMORÌ Via D. Paganelli, 10 - Faenza 0546 26680 - 338.4478743 NUOVA APERTURA º6bV;VZcoV» online il video della campagna RIPARAZIONE presentato lo spot con protagonista l’attrice Maria Pia Timo RC CELLULARI na città che si unisce per sostenere le con lo slogan “Ama Faenza - Scegli le proprie realtà. È quello che emerge dal imprese della tua città” e i titolari delle TABLET Uvideo della campagna di comunica- attività si sono ritratti in numerosi scatti già zione “Ama Faenza”, presentato mercoledì pubblicati sui social. Conclusa la prima fase, Prezzi bassi 20 gennaio in anteprima. la campagna prosegue coinvolgendo P Lo spot, con protagonista l’attrice Maria Pia anche i cittadini. -
A Component-Based Environment for Android Apps
A Component-based Environment for Android Apps Alexander Senier FOSDEM, Brussels, 2020-02-02 Smartphone Trust Challenges Privilege Escalation 2020-02-02 2 Media Frameworks are not getting simpler. How do we avoid such fatal errors? 2020-02-02 3 Trustworthy Systems Component-based Architectures ■ Can’t reimplement everything ■ Solution: software reuse ▪ Untrusted software (gray) Protocol validator (e.g. Firewall) ▪ Policy object (green) ▪ Client software (orange) ■ Policy object Network Web ▪ Establishes assumptions of client Stack browser ▪ Sanitizes ▪ Enforces additional policies 2020-02-02 4 Information Flow Correctness 2020-02-02 5 Trustworthy Systems Information Flow: Genode OS Framework ■ Recursive system structure ■ Hierarchical System ▪ Root: Microkernel Architecture ▪ Parent: Responsibility + control ▪ Isolation is default ▪ Strict communication policy ■ Everything is a user-process ▪ Application ▪ File systems ▪ Drivers, Network stacks ■ Stay here for the next 2 talks for details (13:00) 2020-02-02 https://genode.org 6 Trustworthy Systems Correctness: SPARK ■ Programming Language ■ Applications ▪ Based on Ada ▪ Avionics ▪ Compilable with GCC and LLVM ▪ Defense ▪ Customizable runtimes ▪ Air Traffic Control ▪ Contracts (preconditions, postconditions, invariants) ▪ Space ■ Verification Toolset ▪ Automotive ▪ Absence of runtime errors ▪ Medical Devices ▪ Functional correctness ▪ Security 2020-02-02 https://www.adacore.com/about-spark 7 Applying this Approach to Android Apps 2020-02-02 8 GART Project Objectives ■ Unmodified Android -
Phone Compatibility
Phone Compatibility • Compatible with iPhone models 4S and above using iOS versions 7 or higher. Last Updated: February 14, 2017 • Compatible with phone models using Android versions 4.1 (Jelly Bean) or higher, and that have the following four sensors: Accelerometer, Gyroscope, Magnetometer, GPS/Location Services. • Phone compatibility information is provided by phone manufacturers and third-party sources. While every attempt is made to ensure the accuracy of this information, this list should only be used as a guide. As phones are consistently introduced to market, this list may not be all inclusive and will be updated as new information is received. Please check your phone for the required sensors and operating system. Brand Phone Compatible Non-Compatible Acer Acer Iconia Talk S • Acer Acer Jade Primo • Acer Acer Liquid E3 • Acer Acer Liquid E600 • Acer Acer Liquid E700 • Acer Acer Liquid Jade • Acer Acer Liquid Jade 2 • Acer Acer Liquid Jade Primo • Acer Acer Liquid Jade S • Acer Acer Liquid Jade Z • Acer Acer Liquid M220 • Acer Acer Liquid S1 • Acer Acer Liquid S2 • Acer Acer Liquid X1 • Acer Acer Liquid X2 • Acer Acer Liquid Z200 • Acer Acer Liquid Z220 • Acer Acer Liquid Z3 • Acer Acer Liquid Z4 • Acer Acer Liquid Z410 • Acer Acer Liquid Z5 • Acer Acer Liquid Z500 • Acer Acer Liquid Z520 • Acer Acer Liquid Z6 • Acer Acer Liquid Z6 Plus • Acer Acer Liquid Zest • Acer Acer Liquid Zest Plus • Acer Acer Predator 8 • Alcatel Alcatel Fierce • Alcatel Alcatel Fierce 4 • Alcatel Alcatel Flash Plus 2 • Alcatel Alcatel Go Play • Alcatel Alcatel Idol 4 • Alcatel Alcatel Idol 4s • Alcatel Alcatel One Touch Fire C • Alcatel Alcatel One Touch Fire E • Alcatel Alcatel One Touch Fire S • 1 Phone Compatibility • Compatible with iPhone models 4S and above using iOS versions 7 or higher. -
FY2018 Corporate Strategy Meeting
Corporate Strategy Meeting May 22, 2018 Sony Corporation • Good morning. My name is Kenichiro Yoshida. In April, I was appointed President and CEO. Thank you for coming today. • I am the 11th President in our company’s 72-year history. • As you may know, Sony was founded by Masaru Ibuka and Akio Morita. • My predecessor, Mr. Hirai, and I are from a generation that did not work directly with our founders. Just once, however, I had an opportunity to talk closely with Mr. Morita. That was in New York, where I was assigned at the time, in September 1993, just two months before Mr. Morita suffered a brain hemorrhage. • Mr. Morita told me, “Up until now, Sony has learned many things from the United States. Some Japanese companies might even think that we have surpassed the U.S. But Sony needs to be humble and learn from the U.S. again.” • When I think back on this conversation, I believe the sense of urgency that Mr. Morita felt in 1993 was about the internet. In fact, the internet browser Netscape and the company Amazon both emerged just a year later in 1994. • In the following years, Sony achieved record profit in 1997, and the internet began to have a serious impact on Sony’s business as we entered the 21st century. • Now once again, I feel a sense of management urgency, a need for humility and the importance of a long-term view. 1 1. Business Portfolio 2. Corporate Direction 3. Initiatives of Each Business Segment 4. Financial Targets 5.