How does memory protection in SASOS works?

Posted by chris on Stack Overflow See other posts from Stack Overflow or by chris
Published on 2010-04-10T01:44:17Z Indexed on 2010/04/10 1:53 UTC
Read the original article Hit count: 376

Filed under:

operating-system

|

memory-management

|

protection

|

virtual-address-space

|

address-space

I'd like to know how it works - whether it checks if process can read/write/execute memory on every access, or it does it only once? But when it does it only once, and all processes are in a single address space, how are these other hostile processes are prevented from accessing memory from not their's areas?

© Stack Overflow or respective owner

Related posts about operating-system

When Do OS Questions Belong on Hardware Service Requests?

as seen on Oracle Blogs - Search for 'Oracle Blogs'
Untitled Document My Oracle Support—Logging an Operating System Service Request One of the concerns we hear from our customers with Premier Support for Systems is that they have difficulty logging a Service Request (SR) for an operating system issue. Because Premier… >>> More
How To Create Your Own x86 Operating System for Modern PC Computers

as seen on Stack Overflow - Search for 'Stack Overflow'
I'd like to create a new operating system for x86 PC computers. I'd like it to be 64-bit but possibly run as 32-bit as well. I have these kinds of questions: What kinds of things do you start working on first? Knowing where to start in writing your own operating system seems to me to be a tricky… >>> More
Get-QADComputer -LdapFilter & variables

as seen on Server Fault - Search for 'Server Fault'
Can I use a variable in and LdapFilter with Get-QADComputer? i.e.: $31DaysAgo = (Get-Date).AddDays(-31) $ft = $31DaysAgo.ToFileTime() $StComps = Get-QADComputer -SizeLimit 0 -IncludeAllProperties -SearchRoot ` 'DC=MY,DC=DOMAIN,DC=LOCAL' -LdapFilter '(&(objectcategory=computer) ` (pwdLastSet<=$ft)(|(operatingsystem=Windows… >>> More
Low-Impact Operating System Tracing

as seen on Google Code - Search for 'Google Code'
The Google Open Source Team has the privilege of funding some really great projects in the Open Source space. Mathieu Desnoyers, a student at Ecole Polytechnique, recently defended... >>> More
N. Korea develops operating system with Windows-like GUI, Linux guts

as seen on Internet.com - Search for 'Internet.com'
<b>IT World:</b> "The North Korean government appears to have developed its own graphical Linux-based "Red Star" operating system, though its people still prefer that symbol of Yankee high-tech imperialism, Microsoft Windows." >>> More

Related posts about memory-management

Memory management in objective-c

as seen on Stack Overflow - Search for 'Stack Overflow'
I have this code in one of my classes: - (void) processArray { NSMutableArray* array = [self getArray]; . . . [array release]; array = nil; } - (NSMutableArray*) getArray { //NO 1: NSMutableArray* array = [[NSMutableArray alloc]init]; //NO 2: NSMutableArray* array = [NSMutableArray… >>> More
android memory management outside heap

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi I am working on an application for android and we since we have lots of graphics, we use a lot of memory. I monitor the memory heap size and its about 3-4 Mb , and peeks of 5Mb when I do something that requires more memory (and then goes back to 3). This is not a big deal, but some other stuff… >>> More
Javascript new keyword and memory management

as seen on Stack Overflow - Search for 'Stack Overflow'
Coming from C++ it is hard grained into my mind that everytime I call new I call delete. In javascript I find myself calling new occasionally in my code but (hoping) the garbage collection functionality in the browser will take care of the mess for me. I don't like this - is there a 'delete' method… >>> More
Memory management in ObjC/iPhone

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I have question in memory management (objective C). There are two ideal scenario. ============================= scenario 1 ======================================== (void) funcA { MyObj *c = [otherObj getMyObject]; [c release]; } -(MyObj *) getMyObject //(this method is available in… >>> More
Memory management / ownership question?

as seen on Stack Overflow - Search for 'Stack Overflow'
Do I have this right ... // Reactor.h @property(nonatomic, retain) NSMutableArray *reactorCore; // Reactor.m [self setReactorCore:[NSKeyedUnarchiver unarchiveObjectWithFile:[self dataFilePath]]]; ... -(void)dealloc { [reactorCore release]; [super dealloc]; } I am pretty sure I am doing… >>> More