| // KASAN: null-ptr-deref Write in linear_transfer |
| // https://syzkaller.appspot.com/bug?id=6c009c466863e3293fa563d847e717dfd6438e95 |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <arpa/inet.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <fcntl.h> |
| #include <linux/futex.h> |
| #include <linux/if.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_tun.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| #include <net/if_arp.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/prctl.h> |
| #include <sys/stat.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/uio.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| __attribute__((noreturn)) static void doexit(int status) |
| { |
| volatile unsigned i; |
| syscall(__NR_exit_group, status); |
| for (i = 0;; i++) { |
| } |
| } |
| #include <setjmp.h> |
| #include <signal.h> |
| #include <stdint.h> |
| #include <string.h> |
| #include <string.h> |
| |
| const int kFailStatus = 67; |
| const int kRetryStatus = 69; |
| |
| static void fail(const char* msg, ...) |
| { |
| int e = errno; |
| va_list args; |
| va_start(args, msg); |
| vfprintf(stderr, msg, args); |
| va_end(args); |
| fprintf(stderr, " (errno %d)\n", e); |
| doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus); |
| } |
| |
| static __thread int skip_segv; |
| static __thread jmp_buf segv_env; |
| |
| static void segv_handler(int sig, siginfo_t* info, void* uctx) |
| { |
| uintptr_t addr = (uintptr_t)info->si_addr; |
| const uintptr_t prog_start = 1 << 20; |
| const uintptr_t prog_end = 100 << 20; |
| if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && |
| (addr < prog_start || addr > prog_end)) { |
| _longjmp(segv_env, 1); |
| } |
| doexit(sig); |
| } |
| |
| static void install_segv_handler() |
| { |
| struct sigaction sa; |
| |
| memset(&sa, 0, sizeof(sa)); |
| sa.sa_handler = SIG_IGN; |
| syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); |
| syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); |
| |
| memset(&sa, 0, sizeof(sa)); |
| sa.sa_sigaction = segv_handler; |
| sa.sa_flags = SA_NODEFER | SA_SIGINFO; |
| sigaction(SIGSEGV, &sa, NULL); |
| sigaction(SIGBUS, &sa, NULL); |
| } |
| |
| #define NONFAILING(...) \ |
| { \ |
| __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ |
| if (_setjmp(segv_env) == 0) { \ |
| __VA_ARGS__; \ |
| } \ |
| __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ |
| } |
| |
| static uint64_t current_time_ms() |
| { |
| struct timespec ts; |
| |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| fail("clock_gettime failed"); |
| return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; |
| } |
| |
| static void vsnprintf_check(char* str, size_t size, const char* format, |
| va_list args) |
| { |
| int rv; |
| |
| rv = vsnprintf(str, size, format, args); |
| if (rv < 0) |
| fail("tun: snprintf failed"); |
| if ((size_t)rv >= size) |
| fail("tun: string '%s...' doesn't fit into buffer", str); |
| } |
| |
| static void snprintf_check(char* str, size_t size, const char* format, ...) |
| { |
| va_list args; |
| |
| va_start(args, format); |
| vsnprintf_check(str, size, format, args); |
| va_end(args); |
| } |
| |
| #define COMMAND_MAX_LEN 128 |
| #define PATH_PREFIX \ |
| "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin " |
| #define PATH_PREFIX_LEN (sizeof(PATH_PREFIX) - 1) |
| |
| static void execute_command(const char* format, ...) |
| { |
| va_list args; |
| char command[PATH_PREFIX_LEN + COMMAND_MAX_LEN]; |
| int rv; |
| |
| va_start(args, format); |
| memcpy(command, PATH_PREFIX, PATH_PREFIX_LEN); |
| vsnprintf_check(command + PATH_PREFIX_LEN, COMMAND_MAX_LEN, format, args); |
| rv = system(command); |
| if (rv != 0) |
| fail("tun: command \"%s\" failed with code %d", &command[0], rv); |
| |
| va_end(args); |
| } |
| |
| static int tunfd = -1; |
| static int tun_frags_enabled; |
| |
| #define SYZ_TUN_MAX_PACKET_SIZE 1000 |
| |
| #define MAX_PIDS 32 |
| #define ADDR_MAX_LEN 32 |
| |
| #define LOCAL_MAC "aa:aa:aa:aa:aa:%02hx" |
| #define REMOTE_MAC "bb:bb:bb:bb:bb:%02hx" |
| |
| #define LOCAL_IPV4 "172.20.%d.170" |
| #define REMOTE_IPV4 "172.20.%d.187" |
| |
| #define LOCAL_IPV6 "fe80::%02hxaa" |
| #define REMOTE_IPV6 "fe80::%02hxbb" |
| |
| #define IFF_NAPI 0x0010 |
| #define IFF_NAPI_FRAGS 0x0020 |
| |
| static void initialize_tun(uint64_t pid) |
| { |
| if (pid >= MAX_PIDS) |
| fail("tun: no more than %d executors", MAX_PIDS); |
| int id = pid; |
| |
| tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK); |
| if (tunfd == -1) { |
| printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n"); |
| printf("otherwise fuzzing or reproducing might not work as intended\n"); |
| return; |
| } |
| |
| char iface[IFNAMSIZ]; |
| snprintf_check(iface, sizeof(iface), "syz%d", id); |
| |
| struct ifreq ifr; |
| memset(&ifr, 0, sizeof(ifr)); |
| strncpy(ifr.ifr_name, iface, IFNAMSIZ); |
| ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS; |
| if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) { |
| ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
| if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) |
| fail("tun: ioctl(TUNSETIFF) failed"); |
| } |
| if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0) |
| fail("tun: ioctl(TUNGETIFF) failed"); |
| tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0; |
| |
| char local_mac[ADDR_MAX_LEN]; |
| snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id); |
| char remote_mac[ADDR_MAX_LEN]; |
| snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id); |
| |
| char local_ipv4[ADDR_MAX_LEN]; |
| snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id); |
| char remote_ipv4[ADDR_MAX_LEN]; |
| snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id); |
| |
| char local_ipv6[ADDR_MAX_LEN]; |
| snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id); |
| char remote_ipv6[ADDR_MAX_LEN]; |
| snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id); |
| |
| execute_command("sysctl -w net.ipv6.conf.%s.accept_dad=0", iface); |
| |
| execute_command("sysctl -w net.ipv6.conf.%s.router_solicitations=0", iface); |
| |
| execute_command("ip link set dev %s address %s", iface, local_mac); |
| execute_command("ip addr add %s/24 dev %s", local_ipv4, iface); |
| execute_command("ip -6 addr add %s/120 dev %s", local_ipv6, iface); |
| execute_command("ip neigh add %s lladdr %s dev %s nud permanent", remote_ipv4, |
| remote_mac, iface); |
| execute_command("ip -6 neigh add %s lladdr %s dev %s nud permanent", |
| remote_ipv6, remote_mac, iface); |
| execute_command("ip link set dev %s up", iface); |
| } |
| |
| static void setup_tun(uint64_t pid, bool enable_tun) |
| { |
| if (enable_tun) |
| initialize_tun(pid); |
| } |
| |
| static int read_tun(char* data, int size) |
| { |
| if (tunfd < 0) |
| return -1; |
| |
| int rv = read(tunfd, data, size); |
| if (rv < 0) { |
| if (errno == EAGAIN) |
| return -1; |
| if (errno == EBADFD) |
| return -1; |
| fail("tun: read failed with %d", rv); |
| } |
| return rv; |
| } |
| |
| static void flush_tun() |
| { |
| char data[SYZ_TUN_MAX_PACKET_SIZE]; |
| while (read_tun(&data[0], sizeof(data)) != -1) |
| ; |
| } |
| |
| static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) |
| { |
| if (a0 == 0xc || a0 == 0xb) { |
| char buf[128]; |
| sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, |
| (uint8_t)a2); |
| return open(buf, O_RDWR, 0); |
| } else { |
| char buf[1024]; |
| char* hash; |
| NONFAILING(strncpy(buf, (char*)a0, sizeof(buf))); |
| buf[sizeof(buf) - 1] = 0; |
| while ((hash = strchr(buf, '#'))) { |
| *hash = '0' + (char)(a1 % 10); |
| a1 /= 10; |
| } |
| return open(buf, a2, 0); |
| } |
| } |
| |
| static void test(); |
| |
| void loop() |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| fail("loop fork failed"); |
| if (pid == 0) { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| flush_tun(); |
| test(); |
| doexit(0); |
| } |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| int res = waitpid(-1, &status, __WALL | WNOHANG); |
| if (res == pid) |
| break; |
| usleep(1000); |
| if (current_time_ms() - start > 5 * 1000) { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| break; |
| } |
| } |
| } |
| } |
| |
| struct thread_t { |
| int created, running, call; |
| pthread_t th; |
| }; |
| |
| static struct thread_t threads[16]; |
| static void execute_call(int call); |
| static int running; |
| static int collide; |
| |
| static void* thr(void* arg) |
| { |
| struct thread_t* th = (struct thread_t*)arg; |
| for (;;) { |
| while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) |
| syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); |
| execute_call(th->call); |
| __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); |
| __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &th->running, FUTEX_WAKE); |
| } |
| return 0; |
| } |
| |
| static void execute(int num_calls) |
| { |
| int call, thread; |
| running = 0; |
| for (call = 0; call < num_calls; call++) { |
| for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { |
| struct thread_t* th = &threads[thread]; |
| if (!th->created) { |
| th->created = 1; |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| pthread_attr_setstacksize(&attr, 128 << 10); |
| pthread_create(&th->th, &attr, thr, th); |
| } |
| if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { |
| th->call = call; |
| __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); |
| __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &th->running, FUTEX_WAKE); |
| if (collide && call % 2) |
| break; |
| struct timespec ts; |
| ts.tv_sec = 0; |
| ts.tv_nsec = 20 * 1000 * 1000; |
| syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); |
| if (running) |
| usleep((call == num_calls - 1) ? 10000 : 1000); |
| break; |
| } |
| } |
| } |
| } |
| |
| #ifndef __NR_ioctl |
| #define __NR_ioctl 54 |
| #endif |
| #ifndef __NR_getsockopt |
| #define __NR_getsockopt 365 |
| #endif |
| #ifndef __NR_sendmsg |
| #define __NR_sendmsg 370 |
| #endif |
| #ifndef __NR_setsockopt |
| #define __NR_setsockopt 366 |
| #endif |
| #ifndef __NR_writev |
| #define __NR_writev 146 |
| #endif |
| #ifndef __NR_mmap |
| #define __NR_mmap 192 |
| #endif |
| #undef __NR_mmap |
| #define __NR_mmap __NR_mmap2 |
| |
| long r[2]; |
| uint64_t procid; |
| void execute_call(int call) |
| { |
| switch (call) { |
| case 0: |
| syscall(__NR_mmap, 0x20000000, 0x9000, 3, 0x32, -1, 0); |
| break; |
| case 1: |
| NONFAILING(memcpy((void*)0x20006ff6, "/dev/dsp#", 10)); |
| r[0] = syz_open_dev(0x20006ff6, 1, 2); |
| break; |
| case 2: |
| syscall(__NR_mmap, 0x20009000, 0x1000, 3, 0x32, -1, 0); |
| break; |
| case 3: |
| syscall(__NR_mmap, 0x20009000, 0x1000, 3, 0x32, -1, 0); |
| break; |
| case 4: |
| syscall(__NR_mmap, 0x20009000, 0x1000, 3, 0x32, -1, 0); |
| break; |
| case 5: |
| syscall(__NR_mmap, 0x2000a000, 0x1000, 3, 0x32, -1, 0); |
| break; |
| case 6: |
| NONFAILING(memcpy( |
| (void*)0x2000afd8, |
| "\x77\x7e\x87\x19\x20\x61\x5d\xa9\x97\x82\x31\x52\xd0\xa6\xd4\x0f", |
| 16)); |
| NONFAILING(*(uint16_t*)0x2000afe8 = 0x1b); |
| NONFAILING( |
| memcpy((void*)0x2000afea, |
| "\x81\x25\xc1\x52\xc9\x79\x13\x65\x17\xa5\xb0\x0a\x16\xc4", 14)); |
| syscall(__NR_ioctl, r[0], 0x400454ca, 0x2000afd8); |
| break; |
| case 7: |
| NONFAILING(*(uint32_t*)0x20009fe8 = 0); |
| NONFAILING(*(uint16_t*)0x20009fec = -1); |
| NONFAILING(*(uint16_t*)0x20009fee = 0x10); |
| NONFAILING(*(uint64_t*)0x20009ff0 = 0xffffffffffffffec); |
| NONFAILING(*(uint64_t*)0x20009ff8 = 0); |
| NONFAILING(*(uint32_t*)0x20009ffc = 0x18); |
| if (syscall(__NR_getsockopt, r[0], 0x84, 0x73, 0x20009fe8, 0x20009ffc) != |
| -1) |
| NONFAILING(r[1] = *(uint32_t*)0x20009fe8); |
| break; |
| case 8: |
| NONFAILING(*(uint32_t*)0x20003000 = 0x20005000); |
| NONFAILING(*(uint32_t*)0x20003004 = 0x1c); |
| NONFAILING(*(uint32_t*)0x20003008 = 0x20007fe0); |
| NONFAILING(*(uint32_t*)0x2000300c = 2); |
| NONFAILING(*(uint32_t*)0x20003010 = 0x20007fd0); |
| NONFAILING(*(uint32_t*)0x20003014 = 0x2c); |
| NONFAILING(*(uint32_t*)0x20003018 = 0x8000); |
| NONFAILING(*(uint16_t*)0x20005000 = 0xa); |
| NONFAILING(*(uint16_t*)0x20005002 = htobe16(0x4e20 + procid * 4)); |
| NONFAILING(*(uint32_t*)0x20005004 = 7); |
| NONFAILING(*(uint8_t*)0x20005008 = -1); |
| NONFAILING(*(uint8_t*)0x20005009 = 2); |
| NONFAILING(*(uint8_t*)0x2000500a = 0); |
| NONFAILING(*(uint8_t*)0x2000500b = 0); |
| NONFAILING(*(uint8_t*)0x2000500c = 0); |
| NONFAILING(*(uint8_t*)0x2000500d = 0); |
| NONFAILING(*(uint8_t*)0x2000500e = 0); |
| NONFAILING(*(uint8_t*)0x2000500f = 0); |
| NONFAILING(*(uint8_t*)0x20005010 = 0); |
| NONFAILING(*(uint8_t*)0x20005011 = 0); |
| NONFAILING(*(uint8_t*)0x20005012 = 0); |
| NONFAILING(*(uint8_t*)0x20005013 = 0); |
| NONFAILING(*(uint8_t*)0x20005014 = 0); |
| NONFAILING(*(uint8_t*)0x20005015 = 0); |
| NONFAILING(*(uint8_t*)0x20005016 = 0); |
| NONFAILING(*(uint8_t*)0x20005017 = 1); |
| NONFAILING(*(uint32_t*)0x20005018 = 0x80000001); |
| NONFAILING(*(uint32_t*)0x20007fe0 = 0x20003fae); |
| NONFAILING(*(uint32_t*)0x20007fe4 = 0); |
| NONFAILING(*(uint32_t*)0x20007fe8 = 0x20009000); |
| NONFAILING(*(uint32_t*)0x20007fec = 0); |
| NONFAILING(*(uint32_t*)0x20007fd0 = 0x2c); |
| NONFAILING(*(uint32_t*)0x20007fd4 = 0x84); |
| NONFAILING(*(uint32_t*)0x20007fd8 = 1); |
| NONFAILING(*(uint16_t*)0x20007fdc = 6); |
| NONFAILING(*(uint16_t*)0x20007fde = 3); |
| NONFAILING(*(uint16_t*)0x20007fe0 = 3); |
| NONFAILING(*(uint32_t*)0x20007fe4 = 1); |
| NONFAILING(*(uint32_t*)0x20007fe8 = 5); |
| NONFAILING(*(uint32_t*)0x20007fec = 0x81); |
| NONFAILING(*(uint32_t*)0x20007ff0 = 0xf2c); |
| NONFAILING(*(uint32_t*)0x20007ff4 = 1); |
| NONFAILING(*(uint32_t*)0x20007ff8 = r[1]); |
| syscall(__NR_sendmsg, r[0], 0x20003000, 0x20000000); |
| break; |
| case 9: |
| syscall(__NR_mmap, 0x2000a000, 0x1000, 3, 0x32, -1, 0); |
| break; |
| case 10: |
| NONFAILING(*(uint32_t*)0x2000affc = 0x3f); |
| syscall(__NR_setsockopt, r[0], 0x84, 0x12, 0x2000affc, 4); |
| break; |
| case 11: |
| NONFAILING(*(uint32_t*)0x20003000 = 0x20008f83); |
| NONFAILING(*(uint32_t*)0x20003004 = 1); |
| NONFAILING(memcpy((void*)0x20008f83, "\xbc", 1)); |
| syscall(__NR_writev, r[0], 0x20003000, 1); |
| break; |
| case 12: |
| NONFAILING(*(uint64_t*)0x20005000 = 0x20000000); |
| syscall(__NR_ioctl, r[0], 0xc0045002, 0x20005000); |
| break; |
| } |
| } |
| |
| void test() |
| { |
| memset(r, -1, sizeof(r)); |
| execute(13); |
| collide = 1; |
| execute(13); |
| } |
| |
| int main() |
| { |
| for (procid = 0; procid < 8; procid++) { |
| if (fork() == 0) { |
| install_segv_handler(); |
| for (;;) { |
| setup_tun(procid, true); |
| loop(); |
| } |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |