Introducing ASLR in FreeBSD


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Introducing ASLR in FreeBSD
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Webb, Shawn
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You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
Berkeley System Distribution (BSD), Andrea Ross
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Ottawa, Canada

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Address-space layout randomization (ASLR) has existed in many operating systems for a number of years. The most famous implementation is the PaX patch for Linux's kernel. This presentation introduces and announces an ASLR implementation based on PaX for FreeBSD/amd64. Details regarding how ASLR has been ported to FreeBSD and some advanced features will be presented. FreeBSD will soon be getting a port of PaX to 11-CURRENT/amd64. This presentation details changes to how ELF executables are loaded in memory and innovative workarounds for legacy applications that don't support (or misbehave) ASLR. Jails can have their own ASLR settings. Misbehaving applications can be run in a jail with ASLR turned off, while ASLR remains turned on in the other jails and in the host.
Computer programming Musical ensemble Freeware Service (economics) Code Multiplication sign Patch (Unix) Online help Streaming media Client (computing) Computer Computer icon Open set Number Programmer (hardware) String (computer science) Electronic visual display Software testing Scripting language Process (computing) Information security Address space Physical system Mobile Web Injektivität Installation art Run time (program lifecycle phase) Dialect Inheritance (object-oriented programming) Projective plane Moment (mathematics) Line (geometry) Hand fan Shareware Spring (hydrology) Computer animation Game theory Freeware Family Library (computing)
Spacetime Randomization Injektivität Code Multiplication sign Mereology Dressing (medical) Expected value Programmer (hardware) Video game Cuboid Information security Personal identification number (Denmark) Vulnerability (computing) Physical system Injektivität Sampling (statistics) Functional (mathematics) 10 (number) Energy level Information security Data buffer Point (geometry) Read-only memory Computer programming Numbering scheme Computer file Determinism Online help Mass Computer Number Crash (computing) Touch typing Operating system Authorization Energy level Configuration space Subtraction Metropolitan area network Address space Line (geometry) Cartesian coordinate system Exploit (computer security) Computer animation Personal digital assistant Password Game theory Matching (graph theory) Buffer overflow Address space
Web page Point (geometry) Slide rule Implementation State of matter Patch (Unix) Multiplication sign Decision theory Field (computer science) Canadian Light Source Independence (probability theory) Mathematics Kernel (computing) Software testing Software framework Implementation Hill differential equation Information security Physical system Intelligent Network Randomization Physical law 3 (number) Bit System call Open set Position operator Arithmetic mean Computer animation Pi Order (biology) Quicksort Window Windows Vista
Code State of matter Multiplication sign Insertion loss Mereology Disk read-and-write head Medical imaging Programmer (hardware) Hypermedia Videoconferencing Position operator Vulnerability (computing) Physical system Email Touchscreen Structural load Closed set Binary code Basis (linear algebra) Sound effect Bit Offenes Kommunikationssystem Propagator Arithmetic mean Network topology Website Right angle Read-only memory Implementation Computer file Patch (Unix) Control flow Computer icon Prime ideal Revision control Frequency Latent heat Authorization Scripting language Implementation Computing platform Address space Standard deviation Physical law Independence (probability theory) Stack (abstract data type) Cartesian coordinate system System call Exploit (computer security) Word Computer animation Noise Object (grammar) Window Local ring
Group action Manufacturing execution system Patch (Unix) Dynamical system Streaming media Mereology Rule of inference Bookmark (World Wide Web) Independence (probability theory) Finite element method File system Moving average Software framework Software testing Binary code Basis (linear algebra) Control flow Cartesian coordinate system Local Group Maxima and minima Position operator Sparse matrix Computer animation Lie group Information security
Read-only memory Determinism 1 (number) Insertion loss Mereology Independence (probability theory) Natural number Integer Subtraction Address space Area Structural load Closed set Binary code Independence (probability theory) Set (mathematics) Control flow Cartesian coordinate system Position operator Arithmetic mean Computer animation Personal digital assistant Right angle Object (grammar) Quicksort Information security Data type Window Reverse engineering
Asynchronous Transfer Mode Random number Game controller Implementation Randomization Computer file INTEGRAL Mass Mereology Rule of inference Bookmark (World Wide Web) Number Revision control Medical imaging Mathematics Linker (computing) Authorization Flag Energy level Physical law Software testing Data structure Acoustic shadow Address space Run time (program lifecycle phase) Rule of inference Compact space Default (computer science) Mapping Firewall (computing) Software developer Structural load Physical law Moment (mathematics) Projective plane 3 (number) Cartesian coordinate system Functional (mathematics) Local Group Compiler Position operator Computer animation Pi Function (mathematics) Right angle Energy level Object (grammar) Local ring
Implementation Musical ensemble Ferry Corsten Patch (Unix) Multiplication sign Compiler Online help Client (computing) Mereology Preprocessor Crash (computing) Computer configuration Kernel (computing) Flag Energy level Software testing Software framework Vulnerability (computing) Default (computer science) Installation art Default (computer science) Copyright infringement Inheritance (object-oriented programming) Projective plane Cartesian coordinate system System call Compiler Word Computer configuration Computer animation Commutator Personal digital assistant Phase transition Website
Point (geometry) Presentation of a group Demo (music) Online help Patch (Unix) Projective plane Design by contract 3 (number) Cartesian coordinate system Frame problem Computer animation Pi Order (biology) Videoconferencing Software testing Software testing Matching (graph theory) Address space Session Initiation Protocol
Computer animation Multiplication sign Physical law Bit Cartesian coordinate system System call Address space
Randomization Electronic data interchange Computer animation File system Convex hull Cartesian coordinate system Rule of inference
12 (number) Computer animation Computer file View (database) Personal digital assistant Computer configuration Physical law Basis (linear algebra) Flag Cartesian coordinate system
Electronic data interchange Sic Common Language Infrastructure Computer animation Computer file Personal digital assistant Skewness Physical law Software testing Gastropod shell Cartesian coordinate system
Presentation of a group Online help Software developer Software developer Principal ideal Physical law Insertion loss Number Computer animation Causality Pi Blog Software testing Quicksort God
Randomization Spacetime Proxy server Computer animation Coma Berenices Booting Address space
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project is adding piste caught ports framework it's a heady is at time compiler from a with access all options right now is lost not and based so I have to apply patch so far worse on the call for testing phase on so applied patch sales Saudia Kernel precompile install eternal by default is Allawi turned on when you can biotech firm option and if you do if you use jails on child chills will inherit the potential setting so that means if you have a slot turned off for the parent them without the the need help but it is a lot will be turned off for the child so if you want take advantage of Taesup automatic Collier Applications with the Dutch client ash piracy flags and ideally also a dash tied to your LTY flexes what I'm
in escapist led because are a safe are protection which is recommended feature for a a but is not required were still working out the low level details about of 6 4 protectionism very difficult of things to are Ketek and were going between like 2 or 3 different designs a knock attaches for implementation so word still will be decided on how we want to implement the basic I would say for protection buses it on it pre it frustrates the attacker that is trying to determine the on the inner workings of a slot to see if there is any deterministically here so I like if there is a vulnerability that the that the attackers triggering a causes a sake Fault on an like this h t as each will restocked across the on automatically a crashes at exit part and in a tackle basically to in the past proved for subtract but in this case a staple Fault before Sept the sickle protection just adds a delay in to restoring the application to the old but also the world of the book and that's does really get to know I'd in Dundee loading whose commuter on is actually working on the site for protection features and solo bring met up with him so for future
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