// https://syzkaller.appspot.com/bug?id=df4f17e2c28d3dea6a0ff7598304e55f5ebe292a // 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 #ifndef __NR_bpf #define __NR_bpf 321 #endif static __thread int clone_ongoing; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) { exit(sig); } uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0; int valid = addr < prog_start || addr > prog_end; if (skip && valid) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ ({ \ int ok = 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } else \ ok = 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) struct nlmsg { char* pos; int nesting; struct nlattr* nested[8]; char buf[4096]; }; static void netlink_init(struct nlmsg* nlmsg, int typ, int flags, const void* data, int size) { memset(nlmsg, 0, sizeof(*nlmsg)); struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; hdr->nlmsg_type = typ; hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; memcpy(hdr + 1, data, size); nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size); } static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data, int size) { struct nlattr* attr = (struct nlattr*)nlmsg->pos; attr->nla_len = sizeof(*attr) + size; attr->nla_type = typ; if (size > 0) memcpy(attr + 1, data, size); nlmsg->pos += NLMSG_ALIGN(attr->nla_len); } static void netlink_nest(struct nlmsg* nlmsg, int typ) { struct nlattr* attr = (struct nlattr*)nlmsg->pos; attr->nla_type = typ; nlmsg->pos += sizeof(*attr); nlmsg->nested[nlmsg->nesting++] = attr; } static void netlink_done(struct nlmsg* nlmsg) { struct nlattr* attr = nlmsg->nested[--nlmsg->nesting]; attr->nla_len = nlmsg->pos - (char*)attr; } static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type, int* reply_len, bool dofail) { if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting) exit(1); struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; hdr->nlmsg_len = nlmsg->pos - nlmsg->buf; struct sockaddr_nl addr; memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, (struct sockaddr*)&addr, sizeof(addr)); if (n != (ssize_t)hdr->nlmsg_len) { if (dofail) exit(1); return -1; } n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); if (reply_len) *reply_len = 0; if (n < 0) { if (dofail) exit(1); return -1; } if (n < (ssize_t)sizeof(struct nlmsghdr)) { errno = EINVAL; if (dofail) exit(1); return -1; } if (hdr->nlmsg_type == NLMSG_DONE) return 0; if (reply_len && hdr->nlmsg_type == reply_type) { *reply_len = n; return 0; } if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) { errno = EINVAL; if (dofail) exit(1); return -1; } if (hdr->nlmsg_type != NLMSG_ERROR) { errno = EINVAL; if (dofail) exit(1); return -1; } errno = -((struct nlmsgerr*)(hdr + 1))->error; return -errno; } static int netlink_send(struct nlmsg* nlmsg, int sock) { return netlink_send_ext(nlmsg, sock, 0, NULL, true); } static int netlink_query_family_id(struct nlmsg* nlmsg, int sock, const char* family_name, bool dofail) { struct genlmsghdr genlhdr; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = CTRL_CMD_GETFAMILY; netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name, strnlen(family_name, GENL_NAMSIZ - 1) + 1); int n = 0; int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail); if (err < 0) { return -1; } uint16_t id = 0; struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + NLMSG_ALIGN(sizeof(genlhdr))); for (; (char*)attr < nlmsg->buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { if (attr->nla_type == CTRL_ATTR_FAMILY_ID) { id = *(uint16_t*)(attr + 1); break; } } if (!id) { errno = EINVAL; return -1; } recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); return id; } static void netlink_add_device_impl(struct nlmsg* nlmsg, const char* type, const char* name, bool up) { struct ifinfomsg hdr; memset(&hdr, 0, sizeof(hdr)); if (up) hdr.ifi_flags = hdr.ifi_change = IFF_UP; netlink_init(nlmsg, RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr)); if (name) netlink_attr(nlmsg, IFLA_IFNAME, name, strlen(name)); netlink_nest(nlmsg, IFLA_LINKINFO); netlink_attr(nlmsg, IFLA_INFO_KIND, type, strlen(type)); } static void netlink_device_change(struct nlmsg* nlmsg, int sock, const char* name, bool up, const char* master, const void* mac, int macsize, const char* new_name) { struct ifinfomsg hdr; memset(&hdr, 0, sizeof(hdr)); if (up) hdr.ifi_flags = hdr.ifi_change = IFF_UP; hdr.ifi_index = if_nametoindex(name); netlink_init(nlmsg, RTM_NEWLINK, 0, &hdr, sizeof(hdr)); if (new_name) netlink_attr(nlmsg, IFLA_IFNAME, new_name, strlen(new_name)); if (master) { int ifindex = if_nametoindex(master); netlink_attr(nlmsg, IFLA_MASTER, &ifindex, sizeof(ifindex)); } if (macsize) netlink_attr(nlmsg, IFLA_ADDRESS, mac, macsize); int err = netlink_send(nlmsg, sock); if (err < 0) { } } static struct nlmsg nlmsg; #define NL802154_CMD_SET_SHORT_ADDR 11 #define NL802154_ATTR_IFINDEX 3 #define NL802154_ATTR_SHORT_ADDR 10 static const char* setup_802154() { const char* error = NULL; int sock_generic = -1; int sock_route = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock_route == -1) { error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE) failed"; goto fail; } sock_generic = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock_generic == -1) { error = "socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC) failed"; goto fail; } { int nl802154_family_id = netlink_query_family_id(&nlmsg, sock_generic, "nl802154", true); if (nl802154_family_id < 0) { error = "netlink_query_family_id failed"; goto fail; } for (int i = 0; i < 2; i++) { char devname[] = "wpan0"; devname[strlen(devname) - 1] += i; uint64_t hwaddr = 0xaaaaaaaaaaaa0002 + (i << 8); uint16_t shortaddr = 0xaaa0 + i; int ifindex = if_nametoindex(devname); struct genlmsghdr genlhdr; memset(&genlhdr, 0, sizeof(genlhdr)); genlhdr.cmd = NL802154_CMD_SET_SHORT_ADDR; netlink_init(&nlmsg, nl802154_family_id, 0, &genlhdr, sizeof(genlhdr)); netlink_attr(&nlmsg, NL802154_ATTR_IFINDEX, &ifindex, sizeof(ifindex)); netlink_attr(&nlmsg, NL802154_ATTR_SHORT_ADDR, &shortaddr, sizeof(shortaddr)); if (netlink_send(&nlmsg, sock_generic) < 0) { error = "NL802154_CMD_SET_SHORT_ADDR failed"; goto fail; } netlink_device_change(&nlmsg, sock_route, devname, true, 0, &hwaddr, sizeof(hwaddr), 0); if (i == 0) { netlink_add_device_impl(&nlmsg, "lowpan", "lowpan0", false); netlink_done(&nlmsg); netlink_attr(&nlmsg, IFLA_LINK, &ifindex, sizeof(ifindex)); if (netlink_send(&nlmsg, sock_route) < 0) { error = "netlink: adding device lowpan0 type lowpan link wpan0"; goto fail; } } } } fail: close(sock_route); close(sock_generic); return error; } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, /*addr=*/0x3ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x400000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x400001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); const char* reason; (void)reason; if ((reason = setup_802154())) printf("the reproducer may not work as expected: 802154 injection setup " "failed: %s\n", reason); install_segv_handler(); intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } NONFAILING(*(uint32_t*)0x4000000005c0 = 0); NONFAILING(*(uint32_t*)0x4000000005c4 = 0xc); NONFAILING(*(uint64_t*)0x4000000005c8 = 0x400000000440); NONFAILING(memcpy((void*)0x400000000440, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff" "\xff\x00\x18\x11\x00\x00", 20)); NONFAILING(*(uint32_t*)0x400000000454 = -1); NONFAILING(memcpy( (void*)0x400000000458, "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x08\x00\x00\x00\x00\x00\x00\x7b\x8a" "\xf8\xff\x00\x00\x00\x00\xbf\xa2\x00\x00\x00\x00\x00\x00\x07\x02\x00\x00" "\xf8\xff\xff\xff\xb7\x03\x00\x00\x08\x00\x00\x00\xb7\x04\x00\x00\x00\x00" "\x00\x00\x85\x00\x00\x00\x82\x00\x00\x00\x95", 65)); NONFAILING(*(uint64_t*)0x4000000005d0 = 0); NONFAILING(*(uint32_t*)0x4000000005d8 = 0); NONFAILING(*(uint32_t*)0x4000000005dc = 0); NONFAILING(*(uint64_t*)0x4000000005e0 = 0); NONFAILING(*(uint32_t*)0x4000000005e8 = 0); NONFAILING(*(uint32_t*)0x4000000005ec = 0x4e); NONFAILING(memset((void*)0x4000000005f0, 0, 16)); NONFAILING(*(uint32_t*)0x400000000600 = 0); NONFAILING(*(uint32_t*)0x400000000604 = 0x14); NONFAILING(*(uint32_t*)0x400000000608 = -1); NONFAILING(*(uint32_t*)0x40000000060c = 0); NONFAILING(*(uint64_t*)0x400000000610 = 0); NONFAILING(*(uint32_t*)0x400000000618 = 0); NONFAILING(*(uint32_t*)0x40000000061c = 0); NONFAILING(*(uint64_t*)0x400000000620 = 0); NONFAILING(*(uint32_t*)0x400000000628 = 0); NONFAILING(*(uint32_t*)0x40000000062c = 0); NONFAILING(*(uint32_t*)0x400000000630 = 0); NONFAILING(*(uint32_t*)0x400000000634 = 0); NONFAILING(*(uint64_t*)0x400000000638 = 0); NONFAILING(*(uint64_t*)0x400000000640 = 0); NONFAILING(*(uint32_t*)0x400000000648 = 0); NONFAILING(*(uint32_t*)0x40000000064c = 0); NONFAILING(*(uint32_t*)0x400000000650 = 0); syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000005c0ul, /*size=*/0x94ul); NONFAILING(*(uint32_t*)0x4000000000c0 = 0); NONFAILING(*(uint32_t*)0x4000000000c4 = 0xc); NONFAILING(*(uint64_t*)0x4000000000c8 = 0x400000000440); NONFAILING(memcpy((void*)0x400000000440, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x18\x12\x00\x00", 20)); NONFAILING(*(uint32_t*)0x400000000454 = -1); NONFAILING( memcpy((void*)0x400000000458, "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x08\x00\x00\x00\x00\x00\x00" "\x7b\x8a\xf8\xff\x00\x00\x00\x00\xbf\xa2\x00\x00\x00\x00\x00\x00" "\x07\x02\x00\x00\xf8\xff\xff\xff\xb7\x03\x00\x00\x08\x00\x00\x00" "\xb7\x04\x00\x00\xf6\x00\x00\x00\x85\x00\x00\x00\x43", 61)); NONFAILING(*(uint64_t*)0x4000000000d0 = 0); NONFAILING(*(uint32_t*)0x4000000000d8 = 0); NONFAILING(*(uint32_t*)0x4000000000dc = 0); NONFAILING(*(uint64_t*)0x4000000000e0 = 0); NONFAILING(*(uint32_t*)0x4000000000e8 = 0); NONFAILING(*(uint32_t*)0x4000000000ec = 0); NONFAILING(memset((void*)0x4000000000f0, 0, 16)); NONFAILING(*(uint32_t*)0x400000000100 = 0); NONFAILING(*(uint32_t*)0x400000000104 = 0); NONFAILING(*(uint32_t*)0x400000000108 = -1); NONFAILING(*(uint32_t*)0x40000000010c = 0); NONFAILING(*(uint64_t*)0x400000000110 = 0); NONFAILING(*(uint32_t*)0x400000000118 = 0); NONFAILING(*(uint32_t*)0x40000000011c = 0); NONFAILING(*(uint64_t*)0x400000000120 = 0); NONFAILING(*(uint32_t*)0x400000000128 = 0); NONFAILING(*(uint32_t*)0x40000000012c = 0); NONFAILING(*(uint32_t*)0x400000000130 = 0); NONFAILING(*(uint32_t*)0x400000000134 = 0); NONFAILING(*(uint64_t*)0x400000000138 = 0); NONFAILING(*(uint64_t*)0x400000000140 = 0); NONFAILING(*(uint32_t*)0x400000000148 = 0); NONFAILING(*(uint32_t*)0x40000000014c = 0); NONFAILING(*(uint32_t*)0x400000000150 = 0); syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000000c0ul, /*size=*/0x94ul); NONFAILING(*(uint32_t*)0x4000000000c0 = 0x1b); NONFAILING(*(uint32_t*)0x4000000000c4 = 0); NONFAILING(*(uint32_t*)0x4000000000c8 = 0); NONFAILING(*(uint32_t*)0x4000000000cc = 0x8000); NONFAILING(*(uint32_t*)0x4000000000d0 = 0); NONFAILING(*(uint32_t*)0x4000000000d4 = -1); NONFAILING(*(uint32_t*)0x4000000000d8 = 0); NONFAILING(memset((void*)0x4000000000dc, 0, 16)); NONFAILING(*(uint32_t*)0x4000000000ec = 0); NONFAILING(*(uint32_t*)0x4000000000f0 = -1); NONFAILING(*(uint32_t*)0x4000000000f4 = 0); NONFAILING(*(uint32_t*)0x4000000000f8 = 0); NONFAILING(*(uint32_t*)0x4000000000fc = 0); NONFAILING(*(uint64_t*)0x400000000100 = 0); NONFAILING(*(uint32_t*)0x400000000108 = 0); NONFAILING(*(uint32_t*)0x40000000010c = 0); res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x4000000000c0ul, /*size=*/0x48ul); if (res != -1) r[0] = res; NONFAILING(*(uint32_t*)0x4000000000c0 = 0); NONFAILING(*(uint32_t*)0x4000000000c4 = 0xc); NONFAILING(*(uint64_t*)0x4000000000c8 = 0x400000000440); NONFAILING(memcpy((void*)0x400000000440, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x18\x12\x00\x00", 20)); NONFAILING(*(uint32_t*)0x400000000454 = r[0]); NONFAILING(*(uint64_t*)0x4000000000d0 = 0); NONFAILING(*(uint32_t*)0x4000000000d8 = 0); NONFAILING(*(uint32_t*)0x4000000000dc = 0); NONFAILING(*(uint64_t*)0x4000000000e0 = 0); NONFAILING(*(uint32_t*)0x4000000000e8 = 0); NONFAILING(*(uint32_t*)0x4000000000ec = 0); NONFAILING(memset((void*)0x4000000000f0, 0, 16)); NONFAILING(*(uint32_t*)0x400000000100 = 0); NONFAILING(*(uint32_t*)0x400000000104 = 0); NONFAILING(*(uint32_t*)0x400000000108 = -1); NONFAILING(*(uint32_t*)0x40000000010c = 0); NONFAILING(*(uint64_t*)0x400000000110 = 0); NONFAILING(*(uint32_t*)0x400000000118 = 0); NONFAILING(*(uint32_t*)0x40000000011c = 0); NONFAILING(*(uint64_t*)0x400000000120 = 0); NONFAILING(*(uint32_t*)0x400000000128 = 0); NONFAILING(*(uint32_t*)0x40000000012c = 0); NONFAILING(*(uint32_t*)0x400000000130 = 0); NONFAILING(*(uint32_t*)0x400000000134 = 0); NONFAILING(*(uint64_t*)0x400000000138 = 0); NONFAILING(*(uint64_t*)0x400000000140 = 0); NONFAILING(*(uint32_t*)0x400000000148 = 0); NONFAILING(*(uint32_t*)0x40000000014c = 0); NONFAILING(*(uint32_t*)0x400000000150 = 0); syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000000c0ul, /*size=*/0x94ul); NONFAILING(*(uint32_t*)0x4000000000c0 = 0x1f); NONFAILING(*(uint32_t*)0x4000000000c4 = 0xc); NONFAILING(*(uint64_t*)0x4000000000c8 = 0x400000000440); NONFAILING(*(uint64_t*)0x4000000000d0 = 0x400000000240); NONFAILING(memcpy((void*)0x400000000240, "GPL\000", 4)); NONFAILING(*(uint32_t*)0x4000000000d8 = 0); NONFAILING(*(uint32_t*)0x4000000000dc = 0); NONFAILING(*(uint64_t*)0x4000000000e0 = 0); NONFAILING(*(uint32_t*)0x4000000000e8 = 0); NONFAILING(*(uint32_t*)0x4000000000ec = 0x12); NONFAILING(memset((void*)0x4000000000f0, 0, 16)); NONFAILING(*(uint32_t*)0x400000000100 = 0); NONFAILING(*(uint32_t*)0x400000000104 = 0); NONFAILING(*(uint32_t*)0x400000000108 = -1); NONFAILING(*(uint32_t*)0x40000000010c = 0); NONFAILING(*(uint64_t*)0x400000000110 = 0); NONFAILING(*(uint32_t*)0x400000000118 = 0); NONFAILING(*(uint32_t*)0x40000000011c = 0); NONFAILING(*(uint64_t*)0x400000000120 = 0); NONFAILING(*(uint32_t*)0x400000000128 = 0); NONFAILING(*(uint32_t*)0x40000000012c = 0); NONFAILING(*(uint32_t*)0x400000000130 = 0); NONFAILING(*(uint32_t*)0x400000000134 = 0); NONFAILING(*(uint64_t*)0x400000000138 = 0); NONFAILING(*(uint64_t*)0x400000000140 = 0); NONFAILING(*(uint32_t*)0x400000000148 = 0); NONFAILING(*(uint32_t*)0x40000000014c = 0); NONFAILING(*(uint32_t*)0x400000000150 = 0); res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x4000000000c0ul, /*size=*/0x90ul); if (res != -1) r[1] = res; NONFAILING(*(uint32_t*)0x400000000740 = r[1]); NONFAILING(*(uint32_t*)0x400000000744 = 0); NONFAILING(*(uint64_t*)0x400000000748 = 0); syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x400000000740ul, /*size=*/0x10ul); return 0; }