// https://syzkaller.appspot.com/bug?id=54a0b6e52ad7bb2701fe062bc95b0375697a90bb // 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 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; } } } void execute_one(void) { memcpy((void*)0x20000180, "net_prio.prioidx\000", 17); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000180ul, /*flags=*/0x275aul, /*mode=*/0ul); { int i; for (i = 0; i < 32; i++) { syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000180ul, /*flags=*/0x275aul, /*mode=*/0ul); } } memcpy((void*)0x20000400, "./file1\000", 8); syscall(__NR_mkdir, /*path=*/0x20000400ul, /*mode=*/0ul); memcpy((void*)0x20000040, "./file0\000", 8); syscall(__NR_mkdir, /*path=*/0x20000040ul, /*mode=*/0ul); memcpy((void*)0x20000300, "./bus\000", 6); syscall(__NR_mkdir, /*path=*/0x20000300ul, /*mode=*/0ul); memcpy((void*)0x200000c0, "./bus\000", 6); memcpy((void*)0x20000340, "overlay\000", 8); memcpy((void*)0x20000100, "workdir", 7); *(uint8_t*)0x20000107 = 0x3d; memcpy((void*)0x20000108, "./bus", 5); *(uint8_t*)0x2000010d = 0x2c; memcpy((void*)0x2000010e, "lowerdir", 8); *(uint8_t*)0x20000116 = 0x3d; memcpy((void*)0x20000117, "./file0", 7); *(uint8_t*)0x2000011e = 0x2c; memcpy((void*)0x2000011f, "upperdir", 8); *(uint8_t*)0x20000127 = 0x3d; memcpy((void*)0x20000128, "./file1", 7); *(uint8_t*)0x2000012f = 0x2c; *(uint8_t*)0x20000130 = 0; syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200000c0ul, /*type=*/0x20000340ul, /*flags=*/0ul, /*opts=*/0x20000100ul); memcpy((void*)0x20000000, "./file0/file0\000", 14); syscall(__NR_creat, /*file=*/0x20000000ul, /*mode=*/0ul); memcpy((void*)0x20000140, "./bus\000", 6); syscall(__NR_chdir, /*dir=*/0x20000140ul); memcpy((void*)0x20000180, "./file0\000", 8); syscall(__NR_open, /*file=*/0x20000180ul, /*flags=*/3ul, /*mode=*/0ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); loop(); return 0; }