Disable Randomization of Memory Addresses

Disable randomization of memory addresses

On Ubuntu , it can be disabled with...

echo 0 > /proc/sys/kernel/randomize_va_space

On Windows, this post might be of some help...

http://blog.didierstevens.com/2007/11/20/quickpost-another-funny-vista-trick-with-aslr/

How to disable address space randomization for a binary on Linux?

Presumably you have some kind of daemon which invokes your parallel programs on the nodes. If so, you can make this common parent disable ASLR for any child processes it creates.

Look in GDB sources (7.0 or CVS Head) for how to do that. The gist of it is to call personality(orig_personality|ADDR_NO_RANDOMIZE) after fork and before exec.

Disable and re-enable address space layout randomization only for myself

The documentation for the randomize_va_space sysctl setting is in Documentation/sysctl/kernel.txt in the kernel source tree. Basically,

0 - Turn the process address space randomization off.

1 - Make the addresses of mmap base, stack and VDSO page randomized.

2 - Additionally enable heap randomization.

How to disable address randomization (ASLR) from an ELF file?

I need to disable ASLR for a specific library (.so).

You can't (and the ASLR does not reside anywhere in the ELF file because it's not a property of the ELF, it's a property of the kernel).

What you can do is disable randomization for a given process. setarch -R is your friend.

warning: Error disabling address space randomization: Operation not permitted

If you're using Docker, you probably need the --security-opt seccomp=unconfined option (as well as enabling ptrace):

docker run --cap-add=SYS_PTRACE --security-opt seccomp=unconfined

How do you disable ASLR (address space layout randomization) on Windows 7 x64?

A registry setting is available to forcibly enable or disable ASLR for all executables and libraries and is found at HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\MoveImages.

Address Space Layout Randomization (ALSR) on macOS

The apparent ineffectiveness of ASLR is an artifact of running within Xcode. Either its use of the debugger or some other diagnostic feature effectively disables ASLR for the process.

Running the program outside of Xcode will show the ASLR behavior you expect.

Address Space Layout Randomization in C Compilers

It appears you are using windows.

Quoting from wikipedia

Microsoft's Windows Vista (released January 2007) and later have ASLR
enabled for only those executables and dynamic link libraries
specifically linked to be ASLR-enabled.
For compatibility, it is not enabled by default for other
applications.
Typically, only older software is incompatible and ASLR can be fully
enabled by editing a registry entry
"HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Memory
Management\MoveImages".

and

Host-based intrusion prevention systems such as WehnTrust and
Ozone also offer ASLR for Windows XP and Windows Server 2003
operating systems. WehnTrust is open-source Complete details of
Ozone's implementation is not available

Make sure you enable the ASLR to observe the expected behaviour.

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