// https://syzkaller.appspot.com/bug?id=4df8387809c7592d307a90556a0979743adaea54 // 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 #include #include #include #include #include #include static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } 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 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_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 long syz_genetlink_get_family_id(volatile long name, volatile long sock_arg) { int fd = sock_arg; if (fd < 0) { fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (fd == -1) { return -1; } } struct nlmsg nlmsg_tmp; int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false); if ((int)sock_arg < 0) close(fd); if (ret < 0) { return -1; } return ret; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[6] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x200002c0, "team0\000\000\000\000\000\000\000\000\000\000\000", 16); syscall(__NR_ioctl, -1, 0x8933, 0x200002c0ul); *(uint64_t*)0x20000000 = 0; *(uint32_t*)0x20000008 = 0; *(uint64_t*)0x20000010 = 0x20000040; *(uint64_t*)0x20000040 = 0x20000280; memcpy((void*)0x20000280, "\x44\x00\x00\x00\x10\x00\x01\x04\x77\xca\x75\x31\x57\x3f\xc4\x00\x92" "\x5e\x4a\x44", 20); *(uint32_t*)0x20000294 = -1; memcpy((void*)0x20000298, "\x0d\x01\x14\x00\x16\x00\x00\x00\x24\x00\x12\x00\x0c\x00\x04\x00\x62" "\x72\x00\x64\x67\x65\x00\x00\x0c\x00\x02\xf6\x08\x00\x00\x00\x01\x08" "\x00\x00\x08\x00\x01", 39); *(uint64_t*)0x20000048 = 0x44; *(uint64_t*)0x20000018 = 1; *(uint64_t*)0x20000020 = 0; *(uint64_t*)0x20000028 = 0; *(uint32_t*)0x20000030 = 0; syscall(__NR_sendmsg, -1, 0x20000000ul, 0ul); res = syscall(__NR_socket, 0x10ul, 0x803ul, 0); if (res != -1) r[0] = res; memcpy((void*)0x200003c0, "nl80211\000", 8); syz_genetlink_get_family_id(0x200003c0, r[0]); *(uint32_t*)0x20000200 = 0xa; res = syscall(__NR_getsockname, r[0], 0x20000100ul, 0x20000200ul); if (res != -1) r[1] = *(uint32_t*)0x20000104; *(uint64_t*)0x20000080 = 0; *(uint32_t*)0x20000088 = 0; *(uint64_t*)0x20000090 = 0x20000000; *(uint64_t*)0x20000000 = 0x20000280; memcpy((void*)0x20000280, "\x48\x00\x00\x00\x10\x00\x05\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x02", 20); *(uint32_t*)0x20000294 = r[1]; *(uint64_t*)0x20000008 = 0x48; *(uint64_t*)0x20000098 = 1; *(uint64_t*)0x200000a0 = 0; *(uint64_t*)0x200000a8 = 0; *(uint32_t*)0x200000b0 = 0; syscall(__NR_sendmsg, r[0], 0x20000080ul, 0x20008000ul); res = syscall(__NR_socket, 1ul, 0x803ul, 0); if (res != -1) r[2] = res; *(uint32_t*)0x200002c0 = 0x14; res = syscall(__NR_getsockname, r[2], 0x20000100ul, 0x200002c0ul); if (res != -1) r[3] = *(uint32_t*)0x20000104; res = syscall(__NR_socket, 0x10ul, 3ul, 0x10); if (res != -1) r[4] = res; memcpy((void*)0x200003c0, "team\000", 5); res = -1; res = syz_genetlink_get_family_id(0x200003c0, -1); if (res != -1) r[5] = res; *(uint64_t*)0x20000000 = 0; *(uint32_t*)0x20000008 = 0; *(uint64_t*)0x20000010 = 0x20000800; *(uint64_t*)0x20000800 = 0x20000840; *(uint32_t*)0x20000840 = 0x58; *(uint16_t*)0x20000844 = r[5]; *(uint16_t*)0x20000846 = 0x601; *(uint32_t*)0x20000848 = 0; *(uint32_t*)0x2000084c = 0; *(uint8_t*)0x20000850 = 1; *(uint8_t*)0x20000851 = 0; *(uint16_t*)0x20000852 = 0; *(uint16_t*)0x20000854 = 8; *(uint16_t*)0x20000856 = 1; *(uint32_t*)0x20000858 = r[3]; *(uint16_t*)0x2000085c = 0x3c; STORE_BY_BITMASK(uint16_t, , 0x2000085e, 2, 0, 14); STORE_BY_BITMASK(uint16_t, , 0x2000085f, 0, 6, 1); STORE_BY_BITMASK(uint16_t, , 0x2000085f, 1, 7, 1); *(uint16_t*)0x20000860 = 0x38; *(uint16_t*)0x20000862 = 1; *(uint16_t*)0x20000864 = 0x24; *(uint16_t*)0x20000866 = 1; memcpy((void*)0x20000868, "mcast_rejoin_" "count\000\000\000\000\000\000\000\000\000\000\000\000\000\000", 32); *(uint16_t*)0x20000888 = 5; *(uint16_t*)0x2000088a = 3; *(uint8_t*)0x2000088c = 3; *(uint16_t*)0x20000890 = 8; *(uint16_t*)0x20000892 = 4; *(uint32_t*)0x20000894 = 6; *(uint64_t*)0x20000808 = 0x58; *(uint64_t*)0x20000018 = 1; *(uint64_t*)0x20000020 = 0; *(uint64_t*)0x20000028 = 0; *(uint32_t*)0x20000030 = 0; syscall(__NR_sendmsg, r[4], 0x20000000ul, 0ul); } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); loop(); return 0; }