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 ...
last modified | size | ||
breakme.c | Tue Oct 15 2024 06:24 am | 2.9K | |
exploit.bytes | Tue Oct 15 2024 06:24 am | 178B | |
exploit.raw | Tue Oct 15 2024 06:24 am | 60B | |
hex2raw.c | Tue Oct 15 2024 06:24 am | 4.0K | |
show_bytes.c | Tue Oct 15 2024 06:24 am | 2.0K | |
test.bytes | Tue Oct 15 2024 06:24 am | 59B | |
test.raw | Tue Oct 15 2024 06:24 am | 5B |