Bomb labs have been graded.
A last assignment for chapter 3 material is due Thursday.
-- cmu -- about 8 weeks after the chapter 3 stuff chap 5 optimization 1 lecture 0.5 week . (rest of) PROGRAM EXECUTION chap 6 caches 2 lecture 1.0 week . chap 7 linking 1 lecture 0.5 week . RUNNING IN THE SYSTEM chap 8 exceptions 2 lectures 1 week . chap 9 virtual memory 4 lectures 2 weeks . chap 11 netwoks 2 lectures 1 week . PROCESS COMMUNICATION chap 12 parallel 4 lectures 2 weeks . -- us -- time remaining is about 6 weeks finish chap 3 (machine code) due Thu Oct 11 Chap ? (?) due Tue Oct 23 (week after Hendrick's) 1 Chap ? (?) due Tue Oct 30 2 Chap ? (?) due Nov 6 3 Chap ? (?) due Nov 13 4 Chap ? (?) due Nov 20 5 Chap ? (?) due Nov 29 6 second lab presentations Dec 4 (last day of classes) second lab code & writeup Dec 7 (Fri after that)
Discuss and look at the "stack overflow" concept - check out my example.
I've uploaded the files that we created in class.
We typed "ABCDEFG" into the program, then put a breakpoint into read_word and used gdb to look at the stack. I've copy pasted that below.
want 0x40075e (print_is_magic) rather than 0x4007ed (main) (gdb) print $rsp $1 = (void *) 0x7fffffffea00 (gdb) x/64bx 0x7fffffffea00 0x7fffffffea00: 0x41 0x42 0x43 0x44 0x45 0x46 0x47 0x0a 0x7fffffffea08: 0x00 0x08 0x40 0x00 0x00 0x00 0x00 0x00 0x7fffffffea10: 0xb0 0x7a 0xde 0xf7 0xff 0x7f 0x00 0x00 0x7fffffffea18: 0x6d 0x08 0x40 0x00 0x00 0x00 0x00 0x00 0x7fffffffea20: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x7fffffffea28: 0x00 0xea 0xff 0xff 0xff 0x7f 0x00 0x00 0x7fffffffea30: 0x50 0xea 0xff 0xff 0xff 0x7f 0x00 0x00 0x7fffffffea38: 0xed 0x07 0x40 0x00 0x00 0x00 0x00 0x00
Ben tells me that he found the issue that kept it from working: there's a newline character on in there (in our previous input) which kept the fgets() in read_line() from reading in our whole exploit ...
|breakme.c||Sun Oct 17 2021 12:40 pm||2.9K|
|exploit.bytes||Sun Oct 17 2021 12:40 pm||178B|
|exploit.raw||Sun Oct 17 2021 12:40 pm||60B|
|hex2raw.c||Sun Oct 17 2021 12:40 pm||4.0K|
|show_bytes.c||Sun Oct 17 2021 12:40 pm||2.0K|
|test.bytes||Sun Oct 17 2021 12:40 pm||59B|
|test.raw||Sun Oct 17 2021 12:40 pm||5B|