level2 done

level2/ressources/linux_shell.s

@@ -0,0 +1,25 @@
+; run /bin/sh and normal exit
+; author @cocomelonc
+; nasm -f elf32 -o example3.o example3.asm
+; ld -m elf_i386 -o example3 example3.o && ./example3
+; 32-bit linux
+
+section .bss
+
+section .text
+  global _start   ; must be declared for linker
+
+_start:           ; linker entry point
+
+  ; xoring anything with itself clears itself:
+  xor eax, eax    ; zero out eax
+  xor ebx, ebx    ; zero out ebx
+  xor ecx, ecx    ; zero out ecx
+  xor edx, edx    ; zero out edx
+
+  push eax        ; string terminator
+  push 0x68732f6e ; "hs/n"
+  push 0x69622f2f ; "ib//"
+  mov ebx, esp    ; "//bin/sh",0 pointer is ESP
+  mov al, 0xb     ; mov eax, 11: execve
+  int 0x80        ; syscall