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Address Space Layout Randomisation (ASLR) is a technology used to help prevent shellcode from being successful. It does this by randomly offsetting the location of modules and certain in-memory structures.

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Is ASLR useless in preventing attacks such as return-to-libc in linux?

Return to PLT ASLR or address space layout randomization is another method to control buffer overflows. … ASLR randomised the address of these executables and thus reduced the probability of spawning a shell by redirecting to them. …
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