| // kernel BUG at drivers/android/binder_alloc.c:LINE! |
| // https://syzkaller.appspot.com/bug?id=012fc28616476a6eba042bfeb6cf261b55750d4a |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.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 <stdarg.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/uio.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_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; |
| 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); |
| } |
| } |
| |
| long r[48]; |
| void loop() |
| { |
| memset(r, -1, sizeof(r)); |
| r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul, |
| 0xfffffffffffffffful, 0x0ul); |
| memcpy((void*)0x20005000, |
| "\x2f\x64\x65\x76\x2f\x62\x69\x6e\x64\x65\x72\x23\x00", 13); |
| r[2] = syz_open_dev(0x20005000ul, 0x0ul, 0x0ul); |
| memcpy((void*)0x201acff3, |
| "\x2f\x64\x65\x76\x2f\x62\x69\x6e\x64\x65\x72\x23\x00", 13); |
| r[4] = syz_open_dev(0x201acff3ul, 0x0ul, 0x0ul); |
| r[5] = syscall(__NR_mmap, 0x20000000ul, 0x2000ul, 0x0ul, 0x20011ul, |
| r[4], 0x0ul); |
| r[6] = syscall(__NR_ioctl, r[4], 0x40046207ul, 0x0ul); |
| *(uint64_t*)0x20008fd0 = (uint64_t)0x4; |
| *(uint64_t*)0x20008fd8 = (uint64_t)0x0; |
| *(uint64_t*)0x20008fe0 = (uint64_t)0x20003fe8; |
| *(uint64_t*)0x20008fe8 = (uint64_t)0x0; |
| *(uint64_t*)0x20008ff0 = (uint64_t)0x0; |
| *(uint64_t*)0x20008ff8 = (uint64_t)0x20009000; |
| *(uint32_t*)0x20003fe8 = (uint32_t)0x630b; |
| r[14] = syscall(__NR_ioctl, r[4], 0xc0306201ul, 0x20008fd0ul); |
| *(uint64_t*)0x20007000 = (uint64_t)0x4; |
| *(uint64_t*)0x20007008 = (uint64_t)0x0; |
| *(uint64_t*)0x20007010 = (uint64_t)0x20005fd4; |
| *(uint64_t*)0x20007018 = (uint64_t)0x0; |
| *(uint64_t*)0x20007020 = (uint64_t)0x0; |
| *(uint64_t*)0x20007028 = (uint64_t)0x20002000; |
| *(uint32_t*)0x20005fd4 = (uint32_t)0x40486311; |
| *(uint64_t*)0x20005fd8 = (uint64_t)0x0; |
| *(uint64_t*)0x20005fe0 = (uint64_t)0x0; |
| r[24] = syscall(__NR_ioctl, r[2], 0xc0306201ul, 0x20007000ul); |
| *(uint64_t*)0x2000dfd0 = (uint64_t)0x54; |
| *(uint64_t*)0x2000dfd8 = (uint64_t)0x0; |
| *(uint64_t*)0x2000dfe0 = (uint64_t)0x2000dfac; |
| *(uint64_t*)0x2000dfe8 = (uint64_t)0xca; |
| *(uint64_t*)0x2000dff0 = (uint64_t)0x0; |
| *(uint64_t*)0x2000dff8 = (uint64_t)0x2000df36; |
| *(uint32_t*)0x2000dfac = (uint32_t)0x400c630e; |
| *(uint32_t*)0x2000dfb0 = (uint32_t)0x3; |
| *(uint64_t*)0x2000dfb4 = (uint64_t)0x4; |
| *(uint32_t*)0x2000dfbc = (uint32_t)0x40106308; |
| *(uint64_t*)0x2000dfc0 = (uint64_t)0x0; |
| *(uint64_t*)0x2000dfc8 = (uint64_t)0x3; |
| *(uint32_t*)0x2000dfd0 = (uint32_t)0x400c630e; |
| *(uint32_t*)0x2000dfd4 = (uint32_t)0x4; |
| *(uint64_t*)0x2000dfd8 = (uint64_t)0x0; |
| *(uint32_t*)0x2000dfe0 = (uint32_t)0x40046306; |
| *(uint32_t*)0x2000dfe4 = (uint32_t)0x1; |
| *(uint32_t*)0x2000dfe8 = (uint32_t)0x40086303; |
| *(uint64_t*)0x2000dfec = (uint64_t)0x0; |
| *(uint32_t*)0x2000dff4 = (uint32_t)0x40086310; |
| *(uint64_t*)0x2000dff8 = (uint64_t)0x4; |
| memcpy((void*)0x2000df36, |
| "\x12\x25\xbd\x0c\xe6\xff\xb6\xfa\x93\xcf\x99\x08\x03\xad\x59" |
| "\x00\x79\x04\xcf\x4b\x9e\x3e\x9f\x75\x1e\xc4\x7a\xc3\xd7\x8c" |
| "\x46\x3c\x71\xd1\xcc\x33\x2c\xbe\x58\xac\x10\xd8\xf7\xd8\x04" |
| "\xb3\xa7\x1f\xe6\xa4\x26\x46\x11\x42\x56\xe3\x8e\x1a\x44\x7e" |
| "\x77\xee\x7b\x5b\x5f\x1c\x97\xe0\x0b\x8c\x88\x25\xdc\x1c\x49" |
| "\xe0\xdd\xb3\x8c\x1c\x4d\xeb\xf8\x0f\xe1\x3a\x47\xbe\xb3\x01" |
| "\xfb\xc4\x8a\x73\xff\x16\x59\xef\x42\x50\xe4\xf3\x1c\xfd\x1b" |
| "\x0c\x21\xe1\xa8\x7d\xaa\xc3\x17\xe8\x2f\x47\x2d\x45\x05\xfc" |
| "\x50\x46\x58\x00\x4b\x79\x93\xde\x11\x23\x3f\x60\xa9\x0e\x1c" |
| "\xe0\x34\xb8\xa8\xca\x17\x68\x54\xe9\x3f\xc8\xab\x9d\x3a\x17" |
| "\x6b\x31\x76\xce\xaa\x62\x64\x44\x01\x69\xda\x3e\x1c\x39\x1b" |
| "\x95\x92\xda\x7d\xa3\x5c\x2d\xa5\x5d\xe5\xe7\x68\x15\x0f\x51" |
| "\x35\x72\xbd\x99\x10\x3a\x2c\x99\xaf\xc2\x07\xd1\x22\xe6\x29" |
| "\x11\xa1\xc8\x90\xd1\x4a\xa9", |
| 202); |
| r[47] = syscall(__NR_ioctl, r[4], 0xc0306201ul, 0x2000dfd0ul); |
| } |
| |
| int main() |
| { |
| setup_tun(0, true); |
| loop(); |
| return 0; |
| } |