| // INFO: suspicious RCU usage in __l2tp_session_unhash |
| // https://syzkaller.appspot.com/bug?id=6597e23f687d59bcbcd2d67fee8d72ff96f0ee16 |
| // status:open |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.h> |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <net/if_arp.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/uio.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <linux/if.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_tun.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| |
| static void sleep_ms(uint64_t ms) |
| { |
| usleep(ms * 1000); |
| } |
| |
| static uint64_t current_time_ms() |
| { |
| struct timespec ts; |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| exit(1); |
| 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) |
| exit(1); |
| if ((size_t)rv >= size) |
| exit(1); |
| } |
| |
| #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(bool panic, 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); |
| va_end(args); |
| rv = system(command); |
| if (rv) { |
| if (panic) |
| exit(1); |
| } |
| } |
| |
| #define DEV_IPV4 "172.20.20.%d" |
| #define DEV_IPV6 "fe80::%02hx" |
| #define DEV_MAC "aa:aa:aa:aa:aa:%02hx" |
| |
| 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); |
| } |
| static void initialize_netdevices(void) |
| { |
| unsigned i; |
| const char* devtypes[] = {"ip6gretap", "bridge", "vcan", "bond", "team"}; |
| const char* devnames[] = {"lo", |
| "sit0", |
| "bridge0", |
| "vcan0", |
| "tunl0", |
| "gre0", |
| "gretap0", |
| "ip_vti0", |
| "ip6_vti0", |
| "ip6tnl0", |
| "ip6gre0", |
| "ip6gretap0", |
| "erspan0", |
| "bond0", |
| "veth0", |
| "veth1", |
| "team0", |
| "veth0_to_bridge", |
| "veth1_to_bridge", |
| "veth0_to_bond", |
| "veth1_to_bond", |
| "veth0_to_team", |
| "veth1_to_team"}; |
| const char* devmasters[] = {"bridge", "bond", "team"}; |
| for (i = 0; i < sizeof(devtypes) / (sizeof(devtypes[0])); i++) |
| execute_command(0, "ip link add dev %s0 type %s", devtypes[i], devtypes[i]); |
| execute_command(0, "ip link add type veth"); |
| for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) { |
| execute_command( |
| 0, "ip link add name %s_slave_0 type veth peer name veth0_to_%s", |
| devmasters[i], devmasters[i]); |
| execute_command( |
| 0, "ip link add name %s_slave_1 type veth peer name veth1_to_%s", |
| devmasters[i], devmasters[i]); |
| execute_command(0, "ip link set %s_slave_0 master %s0", devmasters[i], |
| devmasters[i]); |
| execute_command(0, "ip link set %s_slave_1 master %s0", devmasters[i], |
| devmasters[i]); |
| execute_command(0, "ip link set veth0_to_%s up", devmasters[i]); |
| execute_command(0, "ip link set veth1_to_%s up", devmasters[i]); |
| } |
| execute_command(0, "ip link set bridge_slave_0 up"); |
| execute_command(0, "ip link set bridge_slave_1 up"); |
| for (i = 0; i < sizeof(devnames) / (sizeof(devnames[0])); i++) { |
| char addr[32]; |
| snprintf_check(addr, sizeof(addr), DEV_IPV4, i + 10); |
| execute_command(0, "ip -4 addr add %s/24 dev %s", addr, devnames[i]); |
| snprintf_check(addr, sizeof(addr), DEV_IPV6, i + 10); |
| execute_command(0, "ip -6 addr add %s/120 dev %s", addr, devnames[i]); |
| snprintf_check(addr, sizeof(addr), DEV_MAC, i + 10); |
| execute_command(0, "ip link set dev %s address %s", devnames[i], addr); |
| execute_command(0, "ip link set dev %s up", devnames[i]); |
| } |
| } |
| |
| static void setup_common() |
| { |
| if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { |
| } |
| } |
| |
| 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 = 160 << 20; |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 8 << 20; |
| setrlimit(RLIMIT_MEMLOCK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 136 << 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); |
| rlim.rlim_cur = rlim.rlim_max = 256; |
| setrlimit(RLIMIT_NOFILE, &rlim); |
| if (unshare(CLONE_NEWNS)) { |
| } |
| if (unshare(CLONE_NEWIPC)) { |
| } |
| if (unshare(0x02000000)) { |
| } |
| if (unshare(CLONE_NEWUTS)) { |
| } |
| if (unshare(CLONE_SYSVSEM)) { |
| } |
| } |
| |
| int wait_for_loop(int pid) |
| { |
| if (pid < 0) |
| exit(1); |
| int status = 0; |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| return WEXITSTATUS(status); |
| } |
| |
| static int do_sandbox_none(void) |
| { |
| if (unshare(CLONE_NEWPID)) { |
| } |
| int pid = fork(); |
| if (pid != 0) |
| return wait_for_loop(pid); |
| setup_common(); |
| sandbox_common(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| initialize_netdevices(); |
| loop(); |
| exit(1); |
| } |
| |
| static void kill_and_wait(int pid, int* status) |
| { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| int i; |
| for (i = 0; i < 100; i++) { |
| if (waitpid(-1, status, WNOHANG | __WALL) == pid) |
| return; |
| usleep(1000); |
| } |
| DIR* dir = opendir("/sys/fs/fuse/connections"); |
| if (dir) { |
| for (;;) { |
| struct dirent* ent = readdir(dir); |
| if (!ent) |
| break; |
| if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) |
| continue; |
| char abort[300]; |
| snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", |
| ent->d_name); |
| int fd = open(abort, O_WRONLY); |
| if (fd == -1) { |
| continue; |
| } |
| if (write(fd, abort, 1) < 0) { |
| } |
| close(fd); |
| } |
| closedir(dir); |
| } else { |
| } |
| while (waitpid(-1, status, __WALL) != pid) { |
| } |
| } |
| |
| #define SYZ_HAVE_SETUP_TEST 1 |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| } |
| |
| #define SYZ_HAVE_RESET_TEST 1 |
| static void reset_test() |
| { |
| int fd; |
| for (fd = 3; fd < 30; fd++) |
| close(fd); |
| } |
| |
| static void execute_one(); |
| |
| #define WAIT_FLAGS __WALL |
| |
| static void loop() |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| exit(1); |
| if (pid == 0) { |
| setup_test(); |
| execute_one(); |
| reset_test(); |
| exit(0); |
| } |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) |
| break; |
| sleep_ms(1); |
| if (current_time_ms() - start < 5 * 1000) |
| continue; |
| kill_and_wait(pid, &status); |
| break; |
| } |
| } |
| } |
| |
| uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; |
| |
| void execute_one() |
| { |
| long res = 0; |
| syscall(__NR_ioctl, -1, 0x800454d7, 0x20000100); |
| memcpy((void*)0x20000280, "\x02\x5c\xc8\x3d\x6d\x34\x5f\x8f\x76\x20\x70", 11); |
| syscall(__NR_ioctl, -1, 0x8912, 0x20000280); |
| res = syscall(__NR_socket, 0xa, 2, 0); |
| if (res != -1) |
| r[0] = res; |
| *(uint16_t*)0x20000080 = 0xa; |
| *(uint16_t*)0x20000082 = htobe16(0); |
| *(uint32_t*)0x20000084 = 0; |
| *(uint8_t*)0x20000088 = 0xfe; |
| *(uint8_t*)0x20000089 = 0x80; |
| *(uint8_t*)0x2000008a = 0; |
| *(uint8_t*)0x2000008b = 0; |
| *(uint8_t*)0x2000008c = 0; |
| *(uint8_t*)0x2000008d = 0; |
| *(uint8_t*)0x2000008e = 0; |
| *(uint8_t*)0x2000008f = 0; |
| *(uint8_t*)0x20000090 = 0; |
| *(uint8_t*)0x20000091 = 0; |
| *(uint8_t*)0x20000092 = 0; |
| *(uint8_t*)0x20000093 = 0; |
| *(uint8_t*)0x20000094 = 0; |
| *(uint8_t*)0x20000095 = 0; |
| *(uint8_t*)0x20000096 = 0; |
| *(uint8_t*)0x20000097 = 0xbb; |
| *(uint32_t*)0x20000098 = 0xb; |
| syscall(__NR_connect, r[0], 0x20000080, 0x1c); |
| res = syscall(__NR_socket, 0x18, 1, 1); |
| if (res != -1) |
| r[1] = res; |
| *(uint8_t*)0x20000000 = 0xc; |
| *(uint8_t*)0x20000001 = 0xc; |
| *(uint8_t*)0x20000002 = 4; |
| *(uint8_t*)0x20000003 = 6; |
| *(uint8_t*)0x20000004 = 0; |
| *(uint8_t*)0x20000005 = 0x30; |
| *(uint16_t*)0x20000006 = 0x81; |
| *(uint8_t*)0x20000008 = 0xfe; |
| *(uint8_t*)0x20000009 = 0x80; |
| *(uint8_t*)0x2000000a = 0; |
| *(uint8_t*)0x2000000b = 0; |
| *(uint8_t*)0x2000000c = 0; |
| *(uint8_t*)0x2000000d = 0; |
| *(uint8_t*)0x2000000e = 0; |
| *(uint8_t*)0x2000000f = 0; |
| *(uint8_t*)0x20000010 = 0; |
| *(uint8_t*)0x20000011 = 0; |
| *(uint8_t*)0x20000012 = 0; |
| *(uint8_t*)0x20000013 = 0; |
| *(uint8_t*)0x20000014 = 0; |
| *(uint8_t*)0x20000015 = 0; |
| *(uint8_t*)0x20000016 = 0; |
| *(uint8_t*)0x20000017 = 0x17; |
| *(uint8_t*)0x20000018 = 0xfe; |
| *(uint8_t*)0x20000019 = 0x80; |
| *(uint8_t*)0x2000001a = 0; |
| *(uint8_t*)0x2000001b = 0; |
| *(uint8_t*)0x2000001c = 0; |
| *(uint8_t*)0x2000001d = 0; |
| *(uint8_t*)0x2000001e = 0; |
| *(uint8_t*)0x2000001f = 0; |
| *(uint8_t*)0x20000020 = 0; |
| *(uint8_t*)0x20000021 = 0; |
| *(uint8_t*)0x20000022 = 0; |
| *(uint8_t*)0x20000023 = 0; |
| *(uint8_t*)0x20000024 = 0; |
| *(uint8_t*)0x20000025 = 0; |
| *(uint8_t*)0x20000026 = 0; |
| *(uint8_t*)0x20000027 = 0xaa; |
| *(uint8_t*)0x20000028 = -1; |
| *(uint8_t*)0x20000029 = 2; |
| *(uint8_t*)0x2000002a = 0; |
| *(uint8_t*)0x2000002b = 0; |
| *(uint8_t*)0x2000002c = 0; |
| *(uint8_t*)0x2000002d = 0; |
| *(uint8_t*)0x2000002e = 0; |
| *(uint8_t*)0x2000002f = 0; |
| *(uint8_t*)0x20000030 = 0; |
| *(uint8_t*)0x20000031 = 0; |
| *(uint8_t*)0x20000032 = 0; |
| *(uint8_t*)0x20000033 = 0; |
| *(uint8_t*)0x20000034 = 0; |
| *(uint8_t*)0x20000035 = 0; |
| *(uint8_t*)0x20000036 = 0; |
| *(uint8_t*)0x20000037 = 1; |
| *(uint8_t*)0x20000038 = 0; |
| *(uint8_t*)0x20000039 = 0; |
| *(uint8_t*)0x2000003a = 0; |
| *(uint8_t*)0x2000003b = 0; |
| *(uint8_t*)0x2000003c = 0; |
| *(uint8_t*)0x2000003d = 0; |
| *(uint8_t*)0x2000003e = 0; |
| *(uint8_t*)0x2000003f = 0; |
| *(uint8_t*)0x20000040 = 0; |
| *(uint8_t*)0x20000041 = 0; |
| *(uint8_t*)0x20000042 = 0; |
| *(uint8_t*)0x20000043 = 0; |
| *(uint8_t*)0x20000044 = 0; |
| *(uint8_t*)0x20000045 = 0; |
| *(uint8_t*)0x20000046 = 0; |
| *(uint8_t*)0x20000047 = 0; |
| *(uint8_t*)0x20000048 = 0xfe; |
| *(uint8_t*)0x20000049 = 0x80; |
| *(uint8_t*)0x2000004a = 0; |
| *(uint8_t*)0x2000004b = 0; |
| *(uint8_t*)0x2000004c = 0; |
| *(uint8_t*)0x2000004d = 0; |
| *(uint8_t*)0x2000004e = 0; |
| *(uint8_t*)0x2000004f = 0; |
| *(uint8_t*)0x20000050 = 0; |
| *(uint8_t*)0x20000051 = 0; |
| *(uint8_t*)0x20000052 = 0; |
| *(uint8_t*)0x20000053 = 0; |
| *(uint8_t*)0x20000054 = 0; |
| *(uint8_t*)0x20000055 = 0; |
| *(uint8_t*)0x20000056 = 0; |
| *(uint8_t*)0x20000057 = 0xaa; |
| *(uint8_t*)0x20000058 = 0xfe; |
| *(uint8_t*)0x20000059 = 0x80; |
| *(uint8_t*)0x2000005a = 0; |
| *(uint8_t*)0x2000005b = 0; |
| *(uint8_t*)0x2000005c = 0; |
| *(uint8_t*)0x2000005d = 0; |
| *(uint8_t*)0x2000005e = 0; |
| *(uint8_t*)0x2000005f = 0; |
| *(uint8_t*)0x20000060 = 0; |
| *(uint8_t*)0x20000061 = 0; |
| *(uint8_t*)0x20000062 = 0; |
| *(uint8_t*)0x20000063 = 0; |
| *(uint8_t*)0x20000064 = 0; |
| *(uint8_t*)0x20000065 = 0; |
| *(uint8_t*)0x20000066 = 0; |
| *(uint8_t*)0x20000067 = 0xaa; |
| syscall(__NR_setsockopt, r[0], 0x29, 0x3b, 0x20000000, 0x68); |
| *(uint16_t*)0x205fafd2 = 0x18; |
| *(uint32_t*)0x205fafd4 = 1; |
| *(uint32_t*)0x205fafd8 = 0; |
| *(uint32_t*)0x205fafdc = r[0]; |
| *(uint16_t*)0x205fafe0 = 2; |
| *(uint16_t*)0x205fafe2 = htobe16(0); |
| *(uint32_t*)0x205fafe4 = htobe32(0xe0000002); |
| *(uint8_t*)0x205fafe8 = 0; |
| *(uint8_t*)0x205fafe9 = 0; |
| *(uint8_t*)0x205fafea = 0; |
| *(uint8_t*)0x205fafeb = 0; |
| *(uint8_t*)0x205fafec = 0; |
| *(uint8_t*)0x205fafed = 0; |
| *(uint8_t*)0x205fafee = 0; |
| *(uint8_t*)0x205fafef = 0; |
| *(uint32_t*)0x205faff0 = 4; |
| *(uint32_t*)0x205faff4 = 0; |
| *(uint32_t*)0x205faff8 = 0; |
| *(uint32_t*)0x205faffc = 0; |
| syscall(__NR_connect, r[1], 0x205fafd2, 0x2e); |
| *(uint64_t*)0x20005fc0 = 0x20005680; |
| *(uint16_t*)0x20005680 = 0x1f; |
| *(uint8_t*)0x20005682 = 0; |
| *(uint8_t*)0x20005683 = 0; |
| *(uint8_t*)0x20005684 = 0; |
| *(uint8_t*)0x20005685 = 0; |
| *(uint8_t*)0x20005686 = 0; |
| *(uint8_t*)0x20005687 = 0; |
| *(uint32_t*)0x20005fc8 = 0x80; |
| *(uint64_t*)0x20005fd0 = 0x20005b00; |
| *(uint64_t*)0x20005fd8 = 0; |
| *(uint64_t*)0x20005fe0 = 0; |
| *(uint64_t*)0x20005fe8 = 0; |
| *(uint32_t*)0x20005ff0 = 0; |
| *(uint32_t*)0x20005ff8 = 0; |
| *(uint64_t*)0x20006000 = 0x20005b80; |
| *(uint16_t*)0x20005b80 = 0x1f; |
| *(uint16_t*)0x20005b82 = 0; |
| *(uint8_t*)0x20005b84 = 0; |
| *(uint8_t*)0x20005b85 = 0; |
| *(uint8_t*)0x20005b86 = 0; |
| *(uint8_t*)0x20005b87 = 0; |
| *(uint8_t*)0x20005b88 = 0; |
| *(uint8_t*)0x20005b89 = 0; |
| *(uint16_t*)0x20005b8a = 0; |
| *(uint8_t*)0x20005b8c = 0; |
| *(uint32_t*)0x20006008 = 0x80; |
| *(uint64_t*)0x20006010 = 0x20005c40; |
| *(uint64_t*)0x20006018 = 0x1f4; |
| *(uint64_t*)0x20006020 = 0x20005c80; |
| *(uint64_t*)0x20006028 = 0x3a00; |
| *(uint32_t*)0x20006030 = 0; |
| *(uint32_t*)0x20006038 = 0; |
| syscall(__NR_sendmmsg, r[1], 0x20005fc0, 0x3e8, 0); |
| } |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| do_sandbox_none(); |
| return 0; |
| } |