// https://syzkaller.appspot.com/bug?id=f9c94b10e49ae0433f27c4838c7e0f0a321606f5 // 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 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() { } 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); } #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(-pid, SIGKILL); kill(pid, SIGKILL); while (waitpid(-1, &status, WAIT_FLAGS) != pid) { } break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one() { long res = 0; res = syscall(__NR_socket, 0x10, 3, 6); if (res != -1) r[0] = res; *(uint64_t*)0x20415fc8 = 0x20000040; *(uint16_t*)0x20000040 = 0x10; *(uint16_t*)0x20000042 = 0; *(uint32_t*)0x20000044 = 0; *(uint32_t*)0x20000048 = 0; *(uint32_t*)0x20415fd0 = 0xc; *(uint64_t*)0x20415fd8 = 0x20000080; *(uint64_t*)0x20000080 = 0x200001c0; *(uint32_t*)0x200001c0 = 0xc4; *(uint16_t*)0x200001c4 = 0x19; *(uint16_t*)0x200001c6 = 0xb05; *(uint32_t*)0x200001c8 = 0; *(uint32_t*)0x200001cc = 0; *(uint32_t*)0x200001d0 = htobe32(-1); *(uint32_t*)0x200001e0 = htobe32(0x7f000001); *(uint16_t*)0x200001f0 = htobe16(0); *(uint16_t*)0x200001f2 = htobe16(0); *(uint16_t*)0x200001f4 = htobe16(0); *(uint16_t*)0x200001f6 = htobe16(0); *(uint16_t*)0x200001f8 = 2; *(uint8_t*)0x200001fa = 0; *(uint8_t*)0x200001fb = 0; *(uint8_t*)0x200001fc = 0; *(uint32_t*)0x20000200 = 0; *(uint32_t*)0x20000204 = 0; *(uint64_t*)0x20000208 = 0; *(uint64_t*)0x20000210 = 0; *(uint64_t*)0x20000218 = 0; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0; *(uint64_t*)0x20000230 = 0; *(uint64_t*)0x20000238 = 0; *(uint64_t*)0x20000240 = 0; *(uint64_t*)0x20000248 = 0; *(uint64_t*)0x20000250 = 0; *(uint64_t*)0x20000258 = 0; *(uint64_t*)0x20000260 = 0; *(uint32_t*)0x20000268 = 0; *(uint32_t*)0x2000026c = 0; *(uint8_t*)0x20000270 = 0; *(uint8_t*)0x20000271 = 0; *(uint8_t*)0x20000272 = 0; *(uint8_t*)0x20000273 = 0; *(uint16_t*)0x20000278 = 0xc; *(uint16_t*)0x2000027a = 0x10; *(uint8_t*)0x2000027c = 1; *(uint16_t*)0x2000027e = 0; *(uint8_t*)0x20000280 = 0; *(uint64_t*)0x20000088 = 0xc4; *(uint64_t*)0x20415fe0 = 1; *(uint64_t*)0x20415fe8 = 0; *(uint64_t*)0x20415ff0 = 0; *(uint32_t*)0x20415ff8 = 0; syscall(__NR_sendmsg, r[0], 0x20415fc8, 0); res = syscall(__NR_socket, 0xa, 0x80002, 0x88); if (res != -1) r[1] = res; *(uint16_t*)0x20000080 = 0xa; *(uint16_t*)0x20000082 = htobe16(0x4e23); *(uint32_t*)0x20000084 = 0; *(uint8_t*)0x20000088 = 0; *(uint8_t*)0x20000089 = 0; *(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 = 0; *(uint32_t*)0x20000098 = 0; syscall(__NR_bind, r[1], 0x20000080, 0x1c); *(uint16_t*)0x20000040 = 0xa; *(uint16_t*)0x20000042 = htobe16(0x4e23); *(uint32_t*)0x20000044 = 0; *(uint8_t*)0x20000048 = -1; *(uint8_t*)0x20000049 = 2; *(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 = 1; *(uint32_t*)0x20000058 = 9; syscall(__NR_sendto, r[1], 0x20000140, 0, 0x4048080, 0x20000040, 0x1c); *(uint16_t*)0x20000100 = 0xa; *(uint16_t*)0x20000102 = htobe16(0); *(uint32_t*)0x20000104 = 0; *(uint8_t*)0x20000108 = 0; *(uint8_t*)0x20000109 = 0; *(uint8_t*)0x2000010a = 0; *(uint8_t*)0x2000010b = 0; *(uint8_t*)0x2000010c = 0; *(uint8_t*)0x2000010d = 0; *(uint8_t*)0x2000010e = 0; *(uint8_t*)0x2000010f = 0; *(uint8_t*)0x20000110 = 0; *(uint8_t*)0x20000111 = 0; *(uint8_t*)0x20000112 = 0; *(uint8_t*)0x20000113 = 0; *(uint8_t*)0x20000114 = 0; *(uint8_t*)0x20000115 = 0; *(uint8_t*)0x20000116 = 0; *(uint8_t*)0x20000117 = 0; *(uint32_t*)0x20000118 = 0; syscall(__NR_sendto, r[1], 0x20000000, 0, 0, 0x20000100, 0x1c); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); do_sandbox_none(); return 0; }