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Difference between revisions of "ASLR"
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| + | '''ASLR''' (Address Space Layout Randomization) is a form of data security used to randomize data on the {{wp|Random Access Memory|RAM}} to help prevent exploits from taking control of the system. It first appeared in {{wp|iOS version history#4.3|iOS 4.3}}. |
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| − | Address Space Layout Randomization |
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| + | == Program and dyld == |
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| − | ==First added== |
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| + | * On program load, the address space offset of the program is randomized between 0x0 and 0x100000 |
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| − | *with iOS 4.3 |
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| + | * It always falls on a 0x1000 page boundary |
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| + | * dyld is included in this sliding section |
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| + | == dyld_shared_cache == |
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| − | ==Program and dyld== |
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| + | * The system libraries are now stored in a big cache file, see |
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| − | *On program load, the address space offset of the program is randomized between 0x0 and 0x100000 |
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| + | * This address randomized at boot time, in many possible places, higher in the address space than the program |
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| − | *It always falls on a 0x1000 page boundary |
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| + | * The functions retain a fixed offset to each other. |
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| − | *dyld is included in this sliding section |
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| + | == External Links == |
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| − | ==dyld_shared_cache== |
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| + | * {{wp|Address space layout randomization|ASLR}} on Wikipedia |
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| − | *The system libraries are now stored in a big cache file, see [http://www.iphonedevwiki.net/index.php/Dyld_shared_cache] |
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| + | * [http://www.iphonedevwiki.net/index.php/Dyld_shared_cache ASLR in the dyld] on the iPhone Dev Wiki |
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| − | *This address randomized at boot time, in many possible places, higher in the address space than the program |
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| − | *The functions retain a fixed offset to each other. |
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Revision as of 00:30, 19 January 2012
ASLR (Address Space Layout Randomization) is a form of data security used to randomize data on the Template:Wp to help prevent exploits from taking control of the system. It first appeared in Template:Wp.
Program and dyld
- On program load, the address space offset of the program is randomized between 0x0 and 0x100000
- It always falls on a 0x1000 page boundary
- dyld is included in this sliding section
- The system libraries are now stored in a big cache file, see
- This address randomized at boot time, in many possible places, higher in the address space than the program
- The functions retain a fixed offset to each other.
External Links
- Template:Wp on Wikipedia
- ASLR in the dyld on the iPhone Dev Wiki
