| // possible deadlock in lock_trace |
| // https://syzkaller.appspot.com/bug?id=7e9fcb0736aaac1fc071ddbbb213f82e9a99df01 |
| // status:dup |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <fcntl.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 <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdarg.h> |
| #include <stdbool.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/resource.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 <unistd.h> |
| |
| __attribute__((noreturn)) static void doexit(int status) |
| { |
| volatile unsigned i; |
| syscall(__NR_exit_group, status); |
| for (i = 0;; i++) { |
| } |
| } |
| |
| #include <stdint.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 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 uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1) |
| { |
| |
| char buf[128]; |
| memset(buf, 0, sizeof(buf)); |
| if (a0 == 0) { |
| snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); |
| } else if (a0 == (uintptr_t)-1) { |
| snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); |
| } else { |
| snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, |
| (char*)a1); |
| } |
| int fd = open(buf, O_RDWR); |
| if (fd == -1) |
| fd = open(buf, O_RDONLY); |
| return fd; |
| } |
| |
| static void loop(); |
| |
| static void sandbox_common() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| setsid(); |
| |
| struct rlimit rlim; |
| rlim.rlim_cur = rlim.rlim_max = 128 << 20; |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 8 << 20; |
| setrlimit(RLIMIT_MEMLOCK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 1 << 20; |
| setrlimit(RLIMIT_FSIZE, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 1 << 20; |
| setrlimit(RLIMIT_STACK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 0; |
| setrlimit(RLIMIT_CORE, &rlim); |
| |
| #define CLONE_NEWCGROUP 0x02000000 |
| |
| unshare(CLONE_NEWNS); |
| unshare(CLONE_NEWIPC); |
| unshare(CLONE_NEWCGROUP); |
| unshare(CLONE_NEWNET); |
| unshare(CLONE_NEWUTS); |
| unshare(CLONE_SYSVSEM); |
| } |
| |
| static int do_sandbox_none(int executor_pid, bool enable_tun) |
| { |
| unshare(CLONE_NEWPID); |
| int pid = fork(); |
| if (pid < 0) |
| fail("sandbox fork failed"); |
| if (pid) |
| return pid; |
| |
| sandbox_common(); |
| setup_tun(executor_pid, enable_tun); |
| |
| loop(); |
| doexit(1); |
| } |
| |
| static void test(); |
| |
| void loop() |
| { |
| while (1) { |
| test(); |
| } |
| } |
| |
| long r[28]; |
| void* thr(void* arg) |
| { |
| switch ((long)arg) { |
| case 0: |
| r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul, |
| 0xfffffffffffffffful, 0x0ul); |
| break; |
| case 1: |
| memcpy((void*)0x201c2000, "\x2e\x2f\x66\x69\x6c\x65\x30\x00", 8); |
| r[2] = syscall(__NR_mknod, 0x201c2000ul, 0x1040ul, 0x0ul); |
| break; |
| case 2: |
| memcpy((void*)0x20f8aff8, "\x2e\x2f\x66\x69\x6c\x65\x30\x00", 8); |
| *(uint64_t*)0x20030000 = (uint64_t)0x2085bfa6; |
| *(uint64_t*)0x20030008 = (uint64_t)0x2015effa; |
| *(uint64_t*)0x20030010 = (uint64_t)0x20219ff4; |
| *(uint64_t*)0x20030018 = (uint64_t)0x204ea000; |
| *(uint64_t*)0x20030020 = (uint64_t)0x20e0aff0; |
| *(uint64_t*)0x20030028 = (uint64_t)0x2019f000; |
| *(uint64_t*)0x20030030 = (uint64_t)0x20d8c000; |
| *(uint64_t*)0x20030038 = (uint64_t)0x2072c000; |
| *(uint64_t*)0x20030040 = (uint64_t)0x20ffe000; |
| memcpy((void*)0x2085bfa6, |
| "\x75\x73\x65\x72\x5d\x2a\x6d\x69\x6d\x65\x5f\x74\x79\x70" |
| "\x65\x6d\x64\x35\x73\x75\x6d\x7b\x5d\x74\x72\x75\x73\x74" |
| "\x65\x64\x73\x65\x6c\x69\x6e\x75\x78\x16\x26\x75\x73\x65" |
| "\x72\x73\x65\x63\x75\x72\x69\x74\x79\x2c\x24\x76\x62\x6f" |
| "\x78\x6e\x65\x74\x31\x26\x2b\x5b\x47\x50\x4c\x76\x62\x6f" |
| "\x78\x6e\x65\x74\x31\x6d\x64\x35\x73\x75\x6d\xcf\x65\x74" |
| "\x68\x30\x47\x50\x4c\x00", |
| 90); |
| memcpy((void*)0x2015effa, "\x6c\x6f\x67\x6f\x6e\x00", 6); |
| memcpy((void*)0x20219ff4, |
| "\x65\x6d\x31\x73\x65\x63\x75\x72\x69\x74\x79\x00", 12); |
| memcpy((void*)0x204ea000, |
| "\x63\x70\x75\x73\x65\x74\x7d\x25\x25\x00", 10); |
| memcpy((void*)0x20e0aff0, "\x2f\x64\x65\x76\x2f\x73\x65\x71\x75\x65" |
| "\x6e\x63\x65\x72\x32\x00", |
| 16); |
| memcpy((void*)0x2019f000, "\x21\x7b\x00", 3); |
| memcpy((void*)0x20d8c000, "\x65\x6d\x31\x5b\x2c\x00", 6); |
| memcpy((void*)0x2072c000, |
| "\x40\x73\x65\x63\x75\x72\x69\x74\x79\x2d\x00", 11); |
| memcpy((void*)0x20ffe000, "\x00", 1); |
| r[22] = |
| syscall(__NR_execve, 0x20f8aff8ul, 0x2089d000ul, 0x20030000ul); |
| break; |
| case 3: |
| r[23] = syscall(__NR_pipe2, 0x20c42000ul, 0x0ul); |
| if (r[23] != -1) |
| r[24] = *(uint32_t*)0x20c42004; |
| break; |
| case 4: |
| memcpy((void*)0x20e03ff8, "\x73\x79\x73\x63\x61\x6c\x6c\x00", 8); |
| r[26] = syz_open_procfs(0x0ul, 0x20e03ff8ul); |
| break; |
| case 5: |
| r[27] = syscall(__NR_splice, r[26], 0x0ul, r[24], 0x0ul, 0xa3eaul, |
| 0x0ul); |
| break; |
| } |
| return 0; |
| } |
| |
| void test() |
| { |
| long i; |
| pthread_t th[12]; |
| |
| memset(r, -1, sizeof(r)); |
| for (i = 0; i < 6; i++) { |
| pthread_create(&th[i], 0, thr, (void*)i); |
| usleep(rand() % 10000); |
| } |
| usleep(rand() % 100000); |
| } |
| |
| int main() |
| { |
| int pid = do_sandbox_none(0, true); |
| int status = 0; |
| while (waitpid(pid, &status, __WALL) != pid) { |
| } |
| return 0; |
| } |