// https://syzkaller.appspot.com/bug?id=30b527f38243f236ae27dba7394ec30cc5dacc96 // autogenerated by syzkaller (http://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 __attribute__((noreturn)) static void doexit(int status) { volatile unsigned i; syscall(__NR_exit_group, status); for (i = 0;; i++) { } } #include #include #include #include #include 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); } #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) fail("command '%s' failed: %d", &command[0], rv); } } #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 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); if (unshare(CLONE_NEWNS)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid < 0) fail("sandbox fork failed"); if (pid) return pid; sandbox_common(); if (unshare(CLONE_NEWNET)) { } initialize_netdevices(); loop(); doexit(1); } uint64_t r[2] = {0xffffffffffffffff, 0x0}; void loop() { long res = 0; res = syscall(__NR_socket, 0x200000000000011, 0x803, 0); if (res != -1) r[0] = res; memcpy((void*)0x20000000, "\x73\x69\x74\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); *(uint32_t*)0x20000010 = 0; res = syscall(__NR_ioctl, r[0], 0x8933, 0x20000000); if (res != -1) r[1] = *(uint32_t*)0x20000010; *(uint32_t*)0x200000c0 = 0x180; syscall(__NR_setsockopt, r[0], 1, 0x25, 0x200000c0, 4); *(uint16_t*)0x20000200 = 0x11; *(uint16_t*)0x20000202 = htobe16(0); *(uint32_t*)0x20000204 = r[1]; *(uint16_t*)0x20000208 = 1; *(uint8_t*)0x2000020a = 0; *(uint8_t*)0x2000020b = 6; *(uint8_t*)0x2000020c = -1; *(uint8_t*)0x2000020d = -1; *(uint8_t*)0x2000020e = -1; *(uint8_t*)0x2000020f = -1; *(uint8_t*)0x20000210 = -1; *(uint8_t*)0x20000211 = -1; *(uint8_t*)0x20000212 = 0; *(uint8_t*)0x20000213 = 0; syscall(__NR_bind, r[0], 0x20000200, 0x14); *(uint64_t*)0x20871fc8 = 0x2086c000; *(uint16_t*)0x2086c000 = 0xa; *(uint16_t*)0x2086c002 = htobe16(0); *(uint32_t*)0x2086c004 = 2; *(uint8_t*)0x2086c008 = 0; *(uint8_t*)0x2086c009 = 0; *(uint8_t*)0x2086c00a = 0; *(uint8_t*)0x2086c00b = 0; *(uint8_t*)0x2086c00c = 0; *(uint8_t*)0x2086c00d = 0; *(uint8_t*)0x2086c00e = 0; *(uint8_t*)0x2086c00f = 0; *(uint8_t*)0x2086c010 = 0; *(uint8_t*)0x2086c011 = 0; *(uint8_t*)0x2086c012 = 0; *(uint8_t*)0x2086c013 = 0; *(uint8_t*)0x2086c014 = 0; *(uint8_t*)0x2086c015 = 0; *(uint8_t*)0x2086c016 = 0; *(uint8_t*)0x2086c017 = 0; *(uint32_t*)0x2086c018 = 0; *(uint32_t*)0x20871fd0 = 0x1c; *(uint64_t*)0x20871fd8 = 0x20d1e000; *(uint64_t*)0x20871fe0 = 0; *(uint64_t*)0x20871fe8 = 0x20dda000; *(uint64_t*)0x20871ff0 = 0; *(uint32_t*)0x20871ff8 = 0; syscall(__NR_sendmmsg, r[0], 0x20871fc8, 0x492492492492510, 0); } int main() { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); int pid = do_sandbox_none(); int status = 0; while (waitpid(pid, &status, __WALL) != pid) { } return 0; }