On 11/30/18 8:14 AM, Eric Dumazet wrote: > > // autogenerated by syzkaller (https://github.com/google/syzkaller) > > #define _GNU_SOURCE > > #include <arpa/inet.h> > #include <endian.h> > #include <errno.h> > #include <fcntl.h> > #include <net/if_arp.h> > #include <sched.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 <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 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 = 200 << 20; > setrlimit(RLIMIT_AS, &rlim); > rlim.rlim_cur = rlim.rlim_max = 32 << 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); > } > > uint64_t r[1] = {0xffffffffffffffff}; > > void loop(void) > { > long res = 0; > res = syscall(__NR_socket, 0x10, 0x100000002, 0); > if (res != -1) > r[0] = res; > *(uint64_t*)0x20000080 = 0; > *(uint32_t*)0x20000088 = 0; > *(uint64_t*)0x20000090 = 0x20000000; > *(uint64_t*)0x20000000 = 0x200000c0; > memcpy((void*)0x200000c0, "\x23\x00\x00\x00\x1e\x00\x81\xae\xe4\x05\x0c\x00" > "\x00\x0f\x00\xfe\x07\x01\x01\x00\x00\x00\x00\x00" > "\x63\xda\xc3\x7b\x74\x03\x24\x21\x89\xc6\x09", > 35); > *(uint64_t*)0x20000008 = 0x23; > *(uint64_t*)0x20000098 = 1; > *(uint64_t*)0x200000a0 = 0; > *(uint64_t*)0x200000a8 = 0; > *(uint32_t*)0x200000b0 = 0; > syscall(__NR_sendmsg, r[0], 0x20000080, 0); > *(uint64_t*)0x200005c0 = 0; > *(uint32_t*)0x200005c8 = 0; > *(uint64_t*)0x200005d0 = 0x20000040; > *(uint64_t*)0x20000040 = 0x20000380; > *(uint64_t*)0x20000048 = 0x69; > *(uint64_t*)0x20000050 = 0; > *(uint64_t*)0x20000058 = 0; > *(uint64_t*)0x200005d8 = 2; > *(uint64_t*)0x200005e0 = 0; > *(uint64_t*)0x200005e8 = 0; > *(uint32_t*)0x200005f0 = 0; > syscall(__NR_recvmsg, r[0], 0x200005c0, 0x40); > } > int main(void) > { > syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); > do_sandbox_none(); > return 0; > } >
This does not repro for me: # ./a.out Invalid address length 6 - must be 4 bytes RTNETLINK answers: No buffer space available RTNETLINK answers: Operation not supported Invalid address length 6 - must be 4 bytes Invalid address length 6 - must be 4 bytes Invalid address length 6 - must be 4 bytes Invalid address length 6 - must be 16 bytes Invalid address length 6 - must be 16 bytes Invalid address length 6 - must be 16 bytes config available>?
