Run a python command with "run" on GDB

Question

Hi I'd like to run a python command python -c 'print "\x90"*52' when the program start in GDB, as I would do when I execute : python -c 'print "\x90"*52' | ./myProg . Does anyone knows any way to acheive this?

What I've tried so far :

`python -c 'print "\x90"*52' ` run
run `python -c 'print "\x90"*52' `

I really apologies if I'm not asking on the right StackExchange forum. Thanks.

EDIT

here is a useful link I found talking about input payloads redirection : Managing inputs for payload injection?

i ususally save the output to a file and execute "r < /file" — , Jun 18 '18 at 21:49
@Amirag I just tried this. Looks like it work just fine, thanks a lot ! Please create an answer on this topic so I can mark this topic as "answered". — Nark, Jun 18 '18 at 22:01

yehuda corsia · Accepted Answer · 2019-02-09T22:22:10.950

10

You do not have to use another file, it is just redundant

You can do this by using "Here strings". In your example you can do :

r <<< $(python -c "print '\x90'*52")

You can read about "Here strings" here

edited Feb 09 '19 at 22:22

answered Feb 03 '19 at 18:30

yehuda corsia

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Although this answer does provide a solution, I would love seeing an edit that takes us through the anwer and actually explain it. Naturally, there's no need to explain the python command itself. Thanks! – NirIzr Feb 04 '19 at 11:24

score 7 · Answer 2 · answered Jun 18 '18 at 22:42

I don't know of any way to run a script as a run argument.
A common solution is to redirect your input from a file.

You first need to run the script and save the result:

python -c "print 'A'*50" > my_file

and redirect it to gdb run.

r < my_file

also, from the help run command:

Input and output redirection with ">", "<", or ">>" are also allowed.

which means you can also redirect output if needed.

Run a python command with "run" on GDB

EDIT

2 Answers2