// https://syzkaller.appspot.com/bug?id=74c7b375c3db4f0d294563f41cf0f601167791e1 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include unsigned long long procid; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { 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); } exit(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 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[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0}; void execute_one() { long res = 0; res = syscall(__NR_socket, 0xf, 3, 2); if (res != -1) r[0] = res; NONFAILING(*(uint64_t*)0x20000100 = 0); NONFAILING(*(uint32_t*)0x20000108 = 0); NONFAILING(*(uint64_t*)0x20000110 = 0x208feff0); NONFAILING(*(uint64_t*)0x208feff0 = 0x200001c0); NONFAILING(*(uint8_t*)0x200001c0 = 2); NONFAILING(*(uint8_t*)0x200001c1 = 0xd); NONFAILING(*(uint8_t*)0x200001c2 = 0); NONFAILING(*(uint8_t*)0x200001c3 = 0); NONFAILING(*(uint16_t*)0x200001c4 = 0x10); NONFAILING(*(uint16_t*)0x200001c6 = 0); NONFAILING(*(uint32_t*)0x200001c8 = 0); NONFAILING(*(uint32_t*)0x200001cc = 0); NONFAILING(*(uint16_t*)0x200001d0 = 3); NONFAILING(*(uint16_t*)0x200001d2 = 6); NONFAILING(*(uint8_t*)0x200001d4 = 0); NONFAILING(*(uint8_t*)0x200001d5 = 0); NONFAILING(*(uint16_t*)0x200001d6 = 0); NONFAILING(*(uint16_t*)0x200001d8 = 2); NONFAILING(*(uint16_t*)0x200001da = htobe16(0)); NONFAILING(*(uint32_t*)0x200001dc = htobe32(0xe0000001)); NONFAILING(*(uint8_t*)0x200001e0 = 0); NONFAILING(*(uint8_t*)0x200001e1 = 0); NONFAILING(*(uint8_t*)0x200001e2 = 0); NONFAILING(*(uint8_t*)0x200001e3 = 0); NONFAILING(*(uint8_t*)0x200001e4 = 0); NONFAILING(*(uint8_t*)0x200001e5 = 0); NONFAILING(*(uint8_t*)0x200001e6 = 0); NONFAILING(*(uint8_t*)0x200001e7 = 0); NONFAILING(*(uint16_t*)0x200001e8 = 8); NONFAILING(*(uint16_t*)0x200001ea = 0x12); NONFAILING(*(uint16_t*)0x200001ec = 0); NONFAILING(*(uint8_t*)0x200001ee = 2); NONFAILING(*(uint8_t*)0x200001ef = 0); NONFAILING(*(uint32_t*)0x200001f0 = 0); NONFAILING(*(uint32_t*)0x200001f4 = 0); NONFAILING(*(uint16_t*)0x200001f8 = 0x30); NONFAILING(*(uint16_t*)0x200001fa = 0); NONFAILING(*(uint8_t*)0x200001fc = 0); NONFAILING(*(uint8_t*)0x200001fd = 0); NONFAILING(*(uint16_t*)0x200001fe = 0); NONFAILING(*(uint32_t*)0x20000200 = 0); NONFAILING(*(uint32_t*)0x20000204 = 0); NONFAILING(*(uint64_t*)0x20000208 = htobe64(0)); NONFAILING(*(uint64_t*)0x20000210 = htobe64(1)); NONFAILING(*(uint8_t*)0x20000218 = 0xac); NONFAILING(*(uint8_t*)0x20000219 = 0x14); NONFAILING(*(uint8_t*)0x2000021a = 0x14); NONFAILING(*(uint8_t*)0x2000021b = 0xbb); NONFAILING(*(uint16_t*)0x20000228 = 3); NONFAILING(*(uint16_t*)0x2000022a = 5); NONFAILING(*(uint8_t*)0x2000022c = 0); NONFAILING(*(uint8_t*)0x2000022d = 0); NONFAILING(*(uint16_t*)0x2000022e = 0); NONFAILING(*(uint16_t*)0x20000230 = 2); NONFAILING(*(uint16_t*)0x20000232 = htobe16(0)); NONFAILING(*(uint32_t*)0x20000234 = htobe32(0xe0000001)); NONFAILING(*(uint8_t*)0x20000238 = 0); NONFAILING(*(uint8_t*)0x20000239 = 0); NONFAILING(*(uint8_t*)0x2000023a = 0); NONFAILING(*(uint8_t*)0x2000023b = 0); NONFAILING(*(uint8_t*)0x2000023c = 0); NONFAILING(*(uint8_t*)0x2000023d = 0); NONFAILING(*(uint8_t*)0x2000023e = 0); NONFAILING(*(uint8_t*)0x2000023f = 0); NONFAILING(*(uint64_t*)0x208feff8 = 0x80); NONFAILING(*(uint64_t*)0x20000118 = 1); NONFAILING(*(uint64_t*)0x20000120 = 0); NONFAILING(*(uint64_t*)0x20000128 = 0); NONFAILING(*(uint32_t*)0x20000130 = 0); syscall(__NR_sendmsg, r[0], 0x20000100, 0); res = syscall(__NR_socket, 0xa, 2, 0); if (res != -1) r[1] = res; NONFAILING(*(uint16_t*)0x20000200 = 0xa); NONFAILING(*(uint16_t*)0x20000202 = htobe16(0x4e20)); NONFAILING(*(uint32_t*)0x20000204 = 3); NONFAILING(*(uint8_t*)0x20000208 = 0xfe); NONFAILING(*(uint8_t*)0x20000209 = 0x80); NONFAILING(*(uint8_t*)0x2000020a = 0); NONFAILING(*(uint8_t*)0x2000020b = 0); NONFAILING(*(uint8_t*)0x2000020c = 0); NONFAILING(*(uint8_t*)0x2000020d = 0); NONFAILING(*(uint8_t*)0x2000020e = 0); NONFAILING(*(uint8_t*)0x2000020f = 0); NONFAILING(*(uint8_t*)0x20000210 = 0); NONFAILING(*(uint8_t*)0x20000211 = 0); NONFAILING(*(uint8_t*)0x20000212 = 0); NONFAILING(*(uint8_t*)0x20000213 = 0); NONFAILING(*(uint8_t*)0x20000214 = 0); NONFAILING(*(uint8_t*)0x20000215 = 0); NONFAILING(*(uint8_t*)0x20000216 = 0); NONFAILING(*(uint8_t*)0x20000217 = 0xbb); NONFAILING(*(uint32_t*)0x20000218 = 2); syscall(__NR_connect, r[1], 0x20000200, 0x1c); NONFAILING(*(uint16_t*)0x20000140 = 0xa); NONFAILING(*(uint16_t*)0x20000142 = htobe16(-1)); NONFAILING(*(uint32_t*)0x20000144 = 0); NONFAILING(*(uint8_t*)0x20000148 = 0); NONFAILING(*(uint8_t*)0x20000149 = 0); NONFAILING(*(uint8_t*)0x2000014a = 0); NONFAILING(*(uint8_t*)0x2000014b = 0); NONFAILING(*(uint8_t*)0x2000014c = 0); NONFAILING(*(uint8_t*)0x2000014d = 0); NONFAILING(*(uint8_t*)0x2000014e = 0); NONFAILING(*(uint8_t*)0x2000014f = 0); NONFAILING(*(uint8_t*)0x20000150 = 0); NONFAILING(*(uint8_t*)0x20000151 = 0); NONFAILING(*(uint8_t*)0x20000152 = -1); NONFAILING(*(uint8_t*)0x20000153 = -1); NONFAILING(*(uint8_t*)0x20000154 = 0xac); NONFAILING(*(uint8_t*)0x20000155 = 0x14); NONFAILING(*(uint8_t*)0x20000156 = 0x14); NONFAILING(*(uint8_t*)0x20000157 = 0x18); NONFAILING(*(uint32_t*)0x20000158 = 0); syscall(__NR_connect, r[1], 0x20000140, 0x1c); res = syscall(__NR_inotify_init1, 0); if (res != -1) r[2] = res; syscall(__NR_fcntl, r[2], 8, -1); res = syscall(__NR_fcntl, r[2], 0x10, 0x20000140); if (res != -1) NONFAILING(r[3] = *(uint32_t*)0x20000144); syscall(__NR_tkill, r[3], 0xb); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); install_segv_handler(); for (procid = 0; procid < 8; procid++) { if (fork() == 0) { do_sandbox_none(); } } sleep(1000000); return 0; }