2012年6月28日 · I would like to disable address space layout randomization (ASLR) on my system (Ubuntu Gnu/Linux 2.6.32-41-server), but, if I use sysctl -w kernel.randomize_va_space=0 the change would affect all...

2011年10月14日 · I just read about how ASLR helps in preventing buffer overflow attacks and would like to have a look at its implementation. Could someone offer a few pointers on where I could start looking? I wo...

2021年11月27日 · Obviously Linux won't give your process unusable addresses, that would make it raise a #GP (0) exception (and thus segfault) when it tries to execute code from _start. (Or if close to the cutoff, when it tries to load or store .data or .bss) That would actually happen on the instruction that tried to set RIP to a non-canonical value in the first place, likely an iret or sysret 1.

2011年1月10日 · On systems that have ASLR enabled, it is strongly recommended to run gdb with set disable-randomization on (or ensure that it is active by default), in order to be able to get reproduce runs. (gdb) help set disable-randomization Set disabling of debuggee's virtual address space randomization.

2016年7月5日 · ASLR (Address Space Layout Randomization) pretty much states that in order to keep addresses static, we would randomize them in some manner, I've read that specifically within Linux and Unix based systems, implementing ASLR is possible regardless of if our code is a PIE, if it is PIE, all jumps, calls and offsets are relative hence we have no ...

2016年5月12日 · I modified the question to just specifically ask about disabling stack ASLR on Linux. Modern Linux systems do use ASLR by default, so clearly "real" exploits have to deal with it. Disabling ASLR might makes sense while playing around with something, I guess. This attracted two "belongs on superuser" close votes, but that seems weird to me. This is something you'd only do for programming reasons.

2023年11月2日 · I have wrote a c program on a Linux computer which displays main function address. ASLR seems to be enabled because address is not the same if a launch the program several times. I have tried to debug this program with gdb. When the program is run through gdb, the main function's address is the same. So it seems gdb is able to disable ASLR.

2016年3月11日 · For example, they point out that for static ASLR, stack has 19-bits of entropy. In my understanding, this means the stack base address can only be randomized to take 2^19 different values. I want to ask how to calculate that the stack has 19-bits of entropy ? Edit: After checking online, I found some explanation of stack ASLR on Linux.

its linux with a 2.6 kernel and im using an older version of gcc (one that does not offer stack protection)

2016年9月13日 · On IA-32 (x86, 32-bit) running Linux with NX and ASLR enabled, I would exploit this using GOT-overwrite technique, which essentially includes the following steps: