Difference between revisions of "ASLR"

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m (First added: according to wikipedia)
m (dyld_shared_cache: presumably a formatting typo)
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==dyld_shared_cache==
 
==dyld_shared_cache==
*The system libraries are now stored in a big cache file, see [[http://www.iphonedevwiki.net/index.php/Dyld_shared_cache]]
+
*The system libraries are now stored in a big cache file, see [http://www.iphonedevwiki.net/index.php/Dyld_shared_cache]
 
*This is address randomized at boot time, in many possible places
 
*This is address randomized at boot time, in many possible places
 
*The functions retain a fixed offset to each other.
 
*The functions retain a fixed offset to each other.

Revision as of 22:03, 18 January 2012

Address Space Layout Randomization

First added

  • with iOS 4.3

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

dyld_shared_cache

  • The system libraries are now stored in a big cache file, see [1]
  • This is address randomized at boot time, in many possible places
  • The functions retain a fixed offset to each other.