jan/mem_edit
1
1
Fork 2
Code Issues 1 Pull requests Releases Wiki Activity

linux: wait for process before detach, and send SIGCONT #1

Merged
jan merged 1 commit from XeroOl/mem_edit:master into master 2022-08-18 23:38:31 -07:00
Conversation 1 Commits 1 Files changed 1 +2
1 changed files with 2 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files
Showing only changes of commit 46e9456fd4 - Show all commits

linux: wait for process before detach, and send SIGCONT

Prev Next 
I had issues with the ptrace call failing because the process had not yet stopped
from SIGSTOP.
From this stackoverflow answer, it seems that you can use waitpid to
wait until the process is actually stopped. In python, this is exposed
as os.waitpid.

https://stackoverflow.com/questions/20510300/ptrace-detach-fails-after-ptrace-cont-with-errno-esrch#20525326

Additionally, the process was left frozen. I send a SIGCONT to continue
the process after the detach, so that it isn't left stopped.
xerool 2022-04-30 22:37:17 -05:00
commit 46e9456fd4

2
mem_edit/linux.py
View file

@ -58,7 +58,9 @@ class Process(AbstractProcess):
def close(self):
os.kill(self.pid, signal.SIGSTOP)
os.waitpid(self.pid, 0)
ptrace(ptrace_commands['PTRACE_DETACH'], self.pid, 0, 0)
os.kill(self.pid, signal.SIGCONT)
self.pid = None
def write_memory(self, base_address: int, write_buffer: ctypes_buffer_t):