| // KASAN: stack-out-of-bounds Read in memcmp |
| // https://syzkaller.appspot.com/bug?id=b6357f82f451a979ea81d03c1e7a151519bd4c5b |
| // 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); |
| } |
| |
| 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); |
| } |
| |
| static int read_tun(char* data, int size) |
| { |
| int rv = read(tunfd, data, size); |
| if (rv < 0) { |
| if (errno == EAGAIN) |
| return -1; |
| fail("tun: read failed with %d, errno: %d", rv, errno); |
| } |
| return rv; |
| } |
| |
| struct ipv6hdr { |
| __u8 priority : 4, version : 4; |
| __u8 flow_lbl[3]; |
| |
| __be16 payload_len; |
| __u8 nexthdr; |
| __u8 hop_limit; |
| |
| struct in6_addr saddr; |
| struct in6_addr daddr; |
| }; |
| |
| struct tcp_resources { |
| int32_t seq; |
| int32_t ack; |
| }; |
| |
| static uintptr_t syz_extract_tcp_res(uintptr_t a0, uintptr_t a1, |
| uintptr_t a2) |
| { |
| |
| if (tunfd < 0) |
| return (uintptr_t)-1; |
| |
| char data[SYZ_TUN_MAX_PACKET_SIZE]; |
| int rv = read_tun(&data[0], sizeof(data)); |
| if (rv == -1) |
| return (uintptr_t)-1; |
| size_t length = rv; |
| |
| struct tcphdr* tcphdr; |
| |
| if (length < sizeof(struct ethhdr)) |
| return (uintptr_t)-1; |
| struct ethhdr* ethhdr = (struct ethhdr*)&data[0]; |
| |
| if (ethhdr->h_proto == htons(ETH_P_IP)) { |
| if (length < sizeof(struct ethhdr) + sizeof(struct iphdr)) |
| return (uintptr_t)-1; |
| struct iphdr* iphdr = (struct iphdr*)&data[sizeof(struct ethhdr)]; |
| if (iphdr->protocol != IPPROTO_TCP) |
| return (uintptr_t)-1; |
| if (length < |
| sizeof(struct ethhdr) + iphdr->ihl * 4 + sizeof(struct tcphdr)) |
| return (uintptr_t)-1; |
| tcphdr = |
| (struct tcphdr*)&data[sizeof(struct ethhdr) + iphdr->ihl * 4]; |
| } else { |
| if (length < sizeof(struct ethhdr) + sizeof(struct ipv6hdr)) |
| return (uintptr_t)-1; |
| struct ipv6hdr* ipv6hdr = |
| (struct ipv6hdr*)&data[sizeof(struct ethhdr)]; |
| if (ipv6hdr->nexthdr != IPPROTO_TCP) |
| return (uintptr_t)-1; |
| if (length < sizeof(struct ethhdr) + sizeof(struct ipv6hdr) + |
| sizeof(struct tcphdr)) |
| return (uintptr_t)-1; |
| tcphdr = (struct tcphdr*)&data[sizeof(struct ethhdr) + |
| sizeof(struct ipv6hdr)]; |
| } |
| |
| struct tcp_resources* res = (struct tcp_resources*)a0; |
| res->seq = htonl((ntohl(tcphdr->seq) + (uint32_t)a1)); |
| res->ack = htonl((ntohl(tcphdr->ack_seq) + (uint32_t)a2)); |
| |
| return 0; |
| } |
| |
| long r[77]; |
| void loop() |
| { |
| memset(r, -1, sizeof(r)); |
| r[0] = syscall(__NR_mmap, 0x20000000ul, 0xfff000ul, 0x3ul, 0x32ul, |
| r[0], 0x0ul); |
| r[1] = syscall(__NR_socket, 0xaul, 0x2ul, 0x0ul); |
| *(uint8_t*)0x20000f18 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f19 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f1a = (uint8_t)0x0; |
| *(uint8_t*)0x20000f1b = (uint8_t)0x0; |
| *(uint8_t*)0x20000f1c = (uint8_t)0x0; |
| *(uint8_t*)0x20000f1d = (uint8_t)0x0; |
| *(uint8_t*)0x20000f1e = (uint8_t)0x0; |
| *(uint8_t*)0x20000f1f = (uint8_t)0x0; |
| *(uint8_t*)0x20000f20 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f21 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f22 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f23 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f24 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f25 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f26 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f27 = (uint8_t)0x0; |
| *(uint64_t*)0x20000f28 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f30 = (uint64_t)0x100000000000000; |
| *(uint16_t*)0x20000f38 = (uint16_t)0x204e; |
| *(uint16_t*)0x20000f3a = (uint16_t)0x0; |
| *(uint16_t*)0x20000f3c = (uint16_t)0x204e; |
| *(uint16_t*)0x20000f3e = (uint16_t)0x0; |
| *(uint16_t*)0x20000f40 = (uint16_t)0xa; |
| *(uint8_t*)0x20000f42 = (uint8_t)0x0; |
| *(uint8_t*)0x20000f43 = (uint8_t)0xa0; |
| *(uint8_t*)0x20000f44 = (uint8_t)0x0; |
| *(uint32_t*)0x20000f48 = r[0]; |
| *(uint32_t*)0x20000f4c = r[0]; |
| *(uint64_t*)0x20000f50 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f58 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f60 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f68 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f70 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f78 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f80 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f88 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f90 = (uint64_t)0x0; |
| *(uint64_t*)0x20000f98 = (uint64_t)0x0; |
| *(uint64_t*)0x20000fa0 = (uint64_t)0x0; |
| *(uint64_t*)0x20000fa8 = (uint64_t)0x0; |
| *(uint32_t*)0x20000fb0 = (uint32_t)0x0; |
| *(uint32_t*)0x20000fb4 = (uint32_t)0x0; |
| *(uint8_t*)0x20000fb8 = (uint8_t)0x1; |
| *(uint8_t*)0x20000fb9 = (uint8_t)0x0; |
| *(uint8_t*)0x20000fba = (uint8_t)0x0; |
| *(uint8_t*)0x20000fbb = (uint8_t)0x0; |
| *(uint32_t*)0x20000fc0 = (uint32_t)0x20000e0; |
| *(uint32_t*)0x20000fd0 = (uint32_t)0x4; |
| *(uint8_t*)0x20000fd4 = (uint8_t)0x7; |
| *(uint16_t*)0x20000fd8 = (uint16_t)0xa; |
| *(uint32_t*)0x20000fdc = (uint32_t)0x100007f; |
| *(uint32_t*)0x20000fec = (uint32_t)0x21a9336f; |
| *(uint8_t*)0x20000ff0 = (uint8_t)0x6; |
| *(uint8_t*)0x20000ff1 = (uint8_t)0x0; |
| *(uint8_t*)0x20000ff2 = (uint8_t)0xff; |
| *(uint32_t*)0x20000ff4 = (uint32_t)0x7fff; |
| *(uint32_t*)0x20000ff8 = (uint32_t)0x1; |
| *(uint32_t*)0x20000ffc = (uint32_t)0x401; |
| r[60] = syscall(__NR_setsockopt, r[1], 0x29ul, 0x23ul, 0x20000f18ul, |
| 0xe8ul); |
| *(uint16_t*)0x20d0d000 = (uint16_t)0x2; |
| *(uint16_t*)0x20d0d002 = (uint16_t)0x234e; |
| *(uint8_t*)0x20d0d004 = (uint8_t)0xac; |
| *(uint8_t*)0x20d0d005 = (uint8_t)0x14; |
| *(uint8_t*)0x20d0d006 = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d007 = (uint8_t)0xbb; |
| *(uint8_t*)0x20d0d008 = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d009 = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d00a = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d00b = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d00c = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d00d = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d00e = (uint8_t)0x0; |
| *(uint8_t*)0x20d0d00f = (uint8_t)0x0; |
| r[75] = syscall(__NR_sendto, r[1], 0x20dec000ul, 0x0ul, 0x0ul, |
| 0x20d0d000ul, 0x10ul); |
| r[76] = syz_extract_tcp_res(0x20000ff8ul, 0x5bul, 0x5ul); |
| } |
| |
| int main() |
| { |
| setup_tun(0, true); |
| loop(); |
| return 0; |
| } |