longld
Aborted (core dumped)
mjh@mjh-VirtualBox:~/hack$ gdb -q ./char_array2
Reading symbols from ./char_array2...
gdb-peda$ list
1 #include <stdio.h>
2 #include <string.h>
3
4 int main() {
5 char str_a[20];
6
7 strcpy(str_a, "Hello, world!\n");
8 printf(str_a);
9 }
gdb-peda$ break 6
Breakpoint 1 at 0x1184: file char_array2.c, line 7.
gdb-peda$ break strcpy
Function "strcpy" not defined.
gdb-peda$ i b
Num Type Disp Enb Address What
1 breakpoint keep y 0x0000000000001184 in main at char_array2.c:7
gdb-peda$ break 8
Breakpoint 2 at 0x11a6: file char_array2.c, line 8.
gdb-peda$ start
[----------------------------------registers-----------------------------------]
RAX: 0x555555555169 (
Temporary breakpoint 3, main () at char_array2.c:4 4 int main() { gdb-peda$ break strcpy Breakpoint 4 at gnu-indirect-function resolver at 0x7ffff7e63200 gdb-peda$ i b Num Type Disp Enb Address What 1 breakpoint keep y 0x0000555555555184 in main at char_array2.c:7 2 breakpoint keep y 0x00005555555551a6 in main at char_array2.c:8 4 STT_GNU_IFUNC resolver keep y 0x00007ffff7e63200 <strcpy_ifunc> gdb-peda$ step [----------------------------------registers-----------------------------------] RAX: 0x0 RBX: 0x5555555551e0 (<__libc_csu_init>: endbr64) RCX: 0x5555555551e0 (<__libc_csu_init>: endbr64) RDX: 0x7fffffffe128 --> 0x7fffffffe440 ("SHELL=/bin/bash") RSI: 0x7fffffffe118 --> 0x7fffffffe425 ("/home/mjh/hack/char_array2") RDI: 0x1 RBP: 0x7fffffffe020 --> 0x0 RSP: 0x7fffffffe000 --> 0x0 RIP: 0x555555555184 (<main+27>: lea rax,[rbp-0x20]) R8 : 0x0 R9 : 0x7ffff7fe0d50 (endbr64) R10: 0x0 R11: 0x0 R12: 0x555555555080 (<_start>: endbr64) R13: 0x7fffffffe110 --> 0x1 R14: 0x0 R15: 0x0 EFLAGS: 0x246 (carry PARITY adjust ZERO sign trap INTERRUPT direction overflow) [-------------------------------------code-------------------------------------] 0x555555555175 <main+12>: mov rax,QWORD PTR fs:0x28 0x55555555517e <main+21>: mov QWORD PTR [rbp-0x8],rax 0x555555555182 <main+25>: xor eax,eax => 0x555555555184 <main+27>: lea rax,[rbp-0x20] 0x555555555188 <main+31>: movabs rdx,0x77202c6f6c6c6548 0x555555555192 <main+41>: mov QWORD PTR [rax],rdx 0x555555555195 <main+44>: mov DWORD PTR [rax+0x8],0x646c726f 0x55555555519c <main+51>: mov WORD PTR [rax+0xc],0xa21 [------------------------------------stack-------------------------------------] 0000| 0x7fffffffe000 --> 0x0 0008| 0x7fffffffe008 --> 0x555555555080 (<_start>: endbr64) 0016| 0x7fffffffe010 --> 0x7fffffffe110 --> 0x1 0024| 0x7fffffffe018 --> 0x96b67f34bb2caa00 0032| 0x7fffffffe020 --> 0x0 0040| 0x7fffffffe028 --> 0x7ffff7de80b3 (<__libc_start_main+243>: mov edi,eax) 0048| 0x7fffffffe030 --> 0x7ffff7ffc620 --> 0x50d1300000000 0056| 0x7fffffffe038 --> 0x7fffffffe118 --> 0x7fffffffe425 ("/home/mjh/hack/char_array2") [------------------------------------------------------------------------------] Legend: code, data, rodata, value Aborted (core dumped) ...Empty peda session file... seems like a very simple task that is causing it to crash ... Normal gdb behavior for break strcpy is (gdb) break strcpy Function "strcpy" not defined. Make breakpoint pending on future shared library load? (y or [n]) but peda will not do this... mjh@mjh-VirtualBox:~/hack$ gdb -q ./char_array2 Reading symbols from ./char_array2... gdb-peda$ break strcpy Function "strcpy" not defined. ...It requires start command then it will allow breakpoint to be made at strcpy but then it crashes when continue used...
