// https://syzkaller.appspot.com/bug?id=238d8ca1fc8d91b49addf4c875d7f486af4b5163 // 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 #ifndef __NR_close_range #define __NR_close_range 436 #endif 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 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[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000280, "/sys/kernel/debug/sync/info\000", 28); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000280ul, /*flags=*/0ul, /*mode=*/0ul); if (res != -1) r[0] = res; syscall(__NR_read, /*fd=*/r[0], /*buf=*/0x20002200ul, /*len=*/0x2020ul); res = syscall(__NR_socket, /*domain=*/0xaul, /*type=*/3ul, /*proto=*/0x3a); if (res != -1) r[1] = res; memcpy((void*)0x20000000, "/sys/kernel/debug/sync/sw_sync\000", 31); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul, /*flags=*/0ul, /*mode=*/0ul); if (res != -1) r[2] = res; *(uint32_t*)0x20000140 = 0x400; memcpy((void*)0x20000144, "\x03\xe6\xff\x8d\xda\x08\x06\x00\x00\x0a\x00\x00\x00\x32\x00\x00\x00" "\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 32); res = syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xc0285700, /*arg=*/0x20000140ul); if (res != -1) r[3] = *(uint32_t*)0x20000164; memcpy((void*)0x20000000, "/sys/kernel/debug/sync/sw_sync\000", 31); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul, /*flags=*/0ul, /*mode=*/0ul); if (res != -1) r[4] = res; *(uint32_t*)0x200001c0 = 0x7fffffff; memcpy((void*)0x200001c4, "\x03\x92\x93\x8e\xda\x08\xa5\x51\x3d\xb9\x9d\x08\xfd\xae\x42\x9e\x4a" "\xe4\xc5\xba\xc9\xdd\x82\x59\xbe\x4e\xe6\x4b\x32\xc6\x5e\x0a", 32); res = syscall(__NR_ioctl, /*fd=*/r[4], /*cmd=*/0xc0285700, /*arg=*/0x200001c0ul); if (res != -1) r[5] = *(uint32_t*)0x200001e4; memcpy((void*)0x20000040, "\x33\x4f\x00\xd6\xda\xf0\x62\xd6\x3d\x5e\x44\x49\xe9\x03\xf9\x3e\x48" "\xfe\x79\x4d\x00\xc0\xad\xb0\x17\xe8\x20\x12\xf7\x89\x82\xac", 32); *(uint32_t*)0x20000060 = r[3]; *(uint32_t*)0x20000068 = 0; *(uint32_t*)0x2000006c = 0; res = syscall(__NR_ioctl, /*fd=*/r[5], /*cmd=*/0xc0303e03, /*arg=*/0x20000040ul); if (res != -1) r[6] = *(uint32_t*)0x20000064; *(uint32_t*)0x20000280 = r[1]; *(uint16_t*)0x20000284 = 0xd; *(uint16_t*)0x20000286 = 0; *(uint32_t*)0x20000288 = r[6]; *(uint16_t*)0x2000028c = 0; *(uint16_t*)0x2000028e = 0; syscall(__NR_ppoll, /*fds=*/0x20000280ul, /*nfds=*/2ul, /*tsp=*/0ul, /*sigmask=*/0ul, /*size=*/0ul); syscall(__NR_close_range, /*fd=*/r[1], /*max_fd=*/-1, /*flags=*/0ul); } 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); for (procid = 0; procid < 4; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }