6 ms·

:( Sounds super 1337 and I hope it's actually possible somehow.

• aa-jv 5mo ago
  Parse /proc/<pid>/maps to find the relevant target_addr in your process-under-attack. And then its a matter of: $ dd if=shellcode.bin of=/proc/<pid>/mem bs=1 seek=$((target_addr)) ... See also: DDExec https://github.com/arget13/DDexec https://github.com/arget13/DDexec
  • jeffbee 5mo ago
    What legitimate purpose does this feature serve? Why should a process be able to write into the virtual memory of another process?
    • aa-jv 5mo ago
      Testing and instrumentation. This feature is used extensively in safety-critical testing procedures, for example. It is also used as a side channel for instrumenting long-running processes. See also: debuggers and profilers, which simply wouldn't work without this capability. I've also since learned that this feature is used in applications (e.g. Firefox) which sandbox their processes, as a means of crash-reporting when some process pisses in their sandbox, crashing ... Sure, it 'seems' dangerous to have this capability - until you need to debug, profile, or instrument something ..