// https://syzkaller.appspot.com/bug?id=80b047eb9aff0254f4adc620c6891c0ca3276309 // 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 static unsigned long long procid; 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; } 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; } static long syz_genetlink_get_family_id(volatile long name) { char buf[512] = {0}; struct nlmsghdr* hdr = (struct nlmsghdr*)buf; struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr); struct nlattr* attr = (struct nlattr*)(genlhdr + 1); hdr->nlmsg_len = sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ; hdr->nlmsg_type = GENL_ID_CTRL; hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; genlhdr->cmd = CTRL_CMD_GETFAMILY; attr->nla_type = CTRL_ATTR_FAMILY_NAME; attr->nla_len = sizeof(*attr) + GENL_NAMSIZ; strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ); struct iovec iov = {hdr, hdr->nlmsg_len}; struct sockaddr_nl addr = {0}; addr.nl_family = AF_NETLINK; int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); if (fd == -1) { return -1; } struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0}; if (sendmsg(fd, &msg, 0) == -1) { close(fd); return -1; } ssize_t n = recv(fd, buf, sizeof(buf), 0); close(fd); if (n <= 0) { return -1; } if (hdr->nlmsg_type != GENL_ID_CTRL) { return -1; } for (; (char*)attr < buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { if (attr->nla_type == CTRL_ATTR_FAMILY_ID) return *(uint16_t*)(attr + 1); } return -1; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (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; for (iter = 0;; 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 < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; syscall(__NR_mmap, 0x20002000ul, 0x1000ul, 2ul, 0x840000000000a132ul, -1, 0ul); res = syscall(__NR_socket, 0x10ul, 3ul, 0x10); if (res != -1) r[0] = res; memcpy((void*)0x20000000, "TIPCv2\000", 7); res = syz_genetlink_get_family_id(0x20000000); if (res != -1) r[1] = res; *(uint64_t*)0x200000c0 = 0; *(uint32_t*)0x200000c8 = 0; *(uint64_t*)0x200000d0 = 0x20000080; *(uint64_t*)0x20000080 = 0x20001640; memcpy((void*)0x20001640, " \000\000\000", 4); *(uint16_t*)0x20001644 = r[1]; memcpy((void*)0x20001646, "\x03\x0b\x00\x20\x00\x00\x00\x00\x00\x00\x13\x00\x00\x00\x0c\x00\x09" "\x80\x08\x00\x02\x00\x05\x00\x00\x41\xd2\x8c\x7f\x18\x32\xd4\x35\xf4" "\xc4\xb1\x0d\x1c\x36\x2f\x68\x91\x0d\xed\x97\x19\xee\x3e\x99\x58\x57" "\xea\x99\xcb\xec\x38\xed\x6d\x2b\x99\x9d\x4c\xcd\x79\x88\x39\x2b\xb1" "\xfe\xc5\x58\xac\x6d\x85\xb9\x42\x34\x79\x0b\x06\x3d\x86\x02\xa3\x13" "\xd1\xd0\x79\x43\x1f\x5b\x5b\x82\x1c\xa0\x1b\xe0\x12\x61\x75\x6d\x01" "\x84\x0d\xe5\x99\x0e\xf8\xb6\xa3\xbf\x1b\x49\x85\x02\x2d\x10\xc5\x5d" "\x8f\x54\x6a\x76\xbb\xf7\x71\x5b\x45\x0c\x8e\x8d\x81\xe1\x91\xd8\xf7" "\x9b\xdc\x36\xe2\x3b\xdc\x7b\x10\x15\x48\xc5\x11\x63\x7e\xac\x24\x79" "\xf0\x7a\xf9\x4f\xe1\x87\xd9\x29\x79\xac\x1d\x57\xfa\x3a\xa6\x11\xf1" "\x6f\xd9\xdc\x2c\x21\x33\x33\xf5\xef\x1e\x13\x51\x16\x9a\xc7\x42\x9b" "\xaa\xac\x33\xdb\x3b\x4b\xc7\x91\xbf\x2a\xf6\xc4\xab\xe3\xdb\x48\x08" "\xc8\x7f\x06\x04\x0f\x7d\xbf\x2b\x8a\x46\x63\x97\x8f\x7f\xc8\x4d", 220); *(uint64_t*)0x20000088 = 0x20; *(uint64_t*)0x200000d8 = 1; *(uint64_t*)0x200000e0 = 0; *(uint64_t*)0x200000e8 = 0; *(uint32_t*)0x200000f0 = 0; syscall(__NR_sendmsg, r[0], 0x200000c0ul, 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); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }