// https://syzkaller.appspot.com/bug?id=248086a64aae8c030ffa4ea371af26544199dbb4 // 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 #ifndef __NR_bpf #define __NR_bpf 321 #endif 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 void setup_802154() { int sock_route = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (sock_route == -1) exit(1); int sock_generic = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (sock_generic < 0) exit(1); int nl802154_family_id = netlink_query_family_id(&nlmsg, sock_generic, "nl802154", true); 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)); int err = netlink_send(&nlmsg, sock_generic); if (err < 0) { } 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)); int err = netlink_send(&nlmsg, sock_route); if (err < 0) { } } } close(sock_route); close(sock_generic); } uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*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=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); setup_802154(); intptr_t res = 0; *(uint32_t*)0x20000080 = 0x11; *(uint32_t*)0x20000084 = 8; *(uint64_t*)0x20000088 = 0x20000580; memcpy( (void*)0x20000580, "\x62\x0a\xf8\xff\x0c\x20\x00\x21\xbf\xa1\x00\x00\x00\x00\x00\x00\x07\x01" 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"\x2e\xdc\x3e\x28\xdd\x27\x1c\x89\x62\x49\xed\x85\xb9\x80\x68\x0b\x00\x00" "\x2b\x43\x5a\xc1\x5f\xc0\x28\x8d\x9b\x2a\x16\x9c\xdc\xac\xc4\x13\x03\x8d" "\xaf\xb7\xa2\xc8\xcb\x48\x2b\xac\x0a\xc5\x02\xd9\xba\x96\xff\xff\xff\x7f" "\x00\x00\x10\x00\x00\x00\x00\x00\x00\x7d\x5a\xd8\x97\xef\x3b\x7c\xda\x42" "\x01\x3d\x53\x04\x6d\xa2\x1b\x40\x21\x6e\x14\xba\x2d\x6a\xd5\x65\x6b\xff" "\xf1\x7a\xdd\xae\xda\xb2\x5b\x30\x00\x2a\xbb\xba\x7f\xa7\x25\xf3\x84\x00" "\xbe\x7c\x1f\x00\x1b\x2c\xd3\x9e\x48\xdc\xcf\xf7\x29\x43\x32\x82\x83\x06" "\x89\xda\x6b\x53\xb2\x63\x33\x98\x63\x29\x77\x71\x42\x9d\x12\x00\x00\x00" "\x33\x41\xbf\x4a\xba\xca\xc9\x59\x00\xfc\xa0\x49\x3c\xf2\x9b\x33\xdc\xc9" "\xff\xff\xff\xff\xff\xff\xff\xd3\x9f\xec\x22\x71\xff\x01\x58\x96\x46\xef" "\xd1\xcf\x87\x0c\xd7\xbb\x23\x66\xfd\xe4\x1f\x94\x29\x0c\x2a\x5f\xf8\x70" "\xce\x41\xfd\x34\x67\xde\xcb\x05\xcf\xd9\xfc\xb3\x2c\x8e\xd1\xdb\xd9\xd1" "\x0a\x64\xc1\x08\x3d\x5e\x71\xb5\x56\xe4\xea\x01\x36\x8d\xc3\x9b\x5e\x1e" 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"\x2b\x1a\x75\x1b\x58\x8a\xc4\x63\x9f\x35\xa5\x8e\x00\xa5\x0c\x02\x70\x60" "\x8c\x7a\x7f\x10\x13\x2b\x1c\x25\xb9\xea\x81\x23\xf6\x63\xf6\x65\xf6\x21" "\x2f\x87\x5b\x2a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa0\xcc\x2b\x89\xce" "\x15\x25\x74\x8c\xe1\x67\xcb\xab\xb8\x81\xf0\x60\x59\x9a\x6a\x59\xf6\x45" "\xed\xca\x1d\x5c\x24\xb2\xf6\xb8\xc9\x97\xa8\xf3\xe1\xb7\x67\x99\x84\xa5" "\x66\xd9\x8d\x4d\x31\x19\x8e\xe4\xc5\xea\x7b\xe0\xd9\x9c\xf8\x9b\xba\x4a" "\x6f\xd0\xbe\xc1\x2e\x77\x92\xbe\xc3\xc5\x03\x8e\x13\xb1\x98\x2f\x80\xcd" "\xec\xd0\x7f\x89\x08\xa9\x83\xa7\xc9\xfb\x81\xc2\xba\x7f\x7e\x87\xc9\x91" "\xf3\x0e\x50\xd1\xb3\xbb\xe4\xcf\x2a\x2f\x5d\x45\x71\xb6\x56\x8a\xda\x51" "\xbc\x12\x1c\x91\x39\xd2\xa8\xe0\x63\x16\x69\xd6\xb9\xfb\x2d\xd6\x03\xc2" "\x85\x80\x42\x54\xe1\xd1\x63\x60\x0d\x0a\x25\x4d\x3b\xe5\x36\x1e\x86\x85" "\x63\x96\x2b\x1d\x83\xa7\xdb\x93\x5a\x53\x80\x43\xca\x09\x53\x01\xbb\x22" "\x6a\x6e\x89\x99\x5c\x7b\x6b\x5e\x01\x35\xee\x8c\xc1\x64\x92\x8f\x74\x87" "\xb3\x6c\xb6\x18\xd0\x94\x9f\x89\xcb\x70\x43\xe6\xa8\x1c\x69\x7e\x10\x85" "\x46\xce\x93\xd9\x7c\xf2\x10\x7a\xe4\x47\xc2\x6f\xa6\xdc\xe6\xf7\x07\x95" "\x55\xb8\x66\xc7\xad\xa4\xcd\xcb\x3e\x42\x2b\x3e\x23\xc8\x76\xfe\xd1\x2d" "\xa1\x6e\x67\xf5\x27\x8a\xe0\xe1\xf7\x65\x68\xa3\xc5\xf6\xa1\xd8\x68\x37" "\xa7\xc0\xf3\x82\xcd\xce\xb7\x5a\x1f\x79\x83\x48\xd4\xb3\x25\x61\x62\x1f" "\x6f\xfe\xca\x73\x59\xca\x7a\x49\xe0\x18\x20\x43\x1a\x5c\x4f\x28\xa2\x8d" "\xc4\xcf\x1f\x23\x6d\x72\x11\x4e\xed\xbd\x8a\xea\x7e\x97\x88\x88\xf0\x26" "\x3e\x1a\xc4\xd9\x78\x4e\x26\x0e\xbf\x9e\x00\x45\xa2\xcd\x9c\x04\x49\x61" "\x8f\x93\xe0\xcb\xb6\x67\x75\xb3\x24\x2c\xea\x07\xb9\x45\x6e\xcc\xcb\xc5" "\xdd\x3a\xb2\xba\x22\x48\xad\xe6\xfb\x1d\xfb\x36\xd9\xa4\x76\x99\xa7\x70" "\x3b\x43\x25\x02\xc8\xad\x3d\xd3\xdc\x6a\x55\xc3\x00\x00", 3974); *(uint64_t*)0x20000090 = 0x20000380; memcpy((void*)0x20000380, "GPL\000", 4); *(uint32_t*)0x20000098 = 0; *(uint32_t*)0x2000009c = 0; *(uint64_t*)0x200000a0 = 0; *(uint32_t*)0x200000a8 = 0; *(uint32_t*)0x200000ac = 0; memset((void*)0x200000b0, 0, 16); *(uint32_t*)0x200000c0 = 0; *(uint32_t*)0x200000c4 = 0; *(uint32_t*)0x200000c8 = -1; *(uint32_t*)0x200000cc = 8; *(uint64_t*)0x200000d0 = 0x20000000; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x200000d8 = 8; *(uint32_t*)0x200000dc = 0x10; *(uint64_t*)0x200000e0 = 0x20000000; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000008 = 0; *(uint32_t*)0x2000000c = 0; *(uint32_t*)0x200000e8 = 0x10; *(uint32_t*)0x200000ec = 0; *(uint32_t*)0x200000f0 = -1; *(uint32_t*)0x200000f4 = 0; *(uint64_t*)0x200000f8 = 0; *(uint64_t*)0x20000100 = 0; *(uint32_t*)0x20000108 = 0x10; *(uint32_t*)0x2000010c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000080ul, /*size=*/0x2eul); if (res != -1) r[0] = res; *(uint64_t*)0x20000180 = 0x20000540; memcpy((void*)0x20000540, "rcu_utilization\000", 16); *(uint32_t*)0x20000188 = r[0]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000180ul, /*size=*/0x10ul); { int i; for (i = 0; i < 64; i++) { syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000180ul, /*size=*/0x10ul); } } return 0; }