// https://syzkaller.appspot.com/bug?id=d87210fde3050cc57d7808ec6217ade7c05709ea // 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); 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"); } #define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak" static void setup_leak() { if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); sleep(5); if (!write_file(KMEMLEAK_FILE, "scan")) exit(1); if (!write_file(KMEMLEAK_FILE, "clear")) exit(1); } static void check_leaks(void) { int fd = open(KMEMLEAK_FILE, O_RDWR); if (fd == -1) exit(1); uint64_t start = current_time_ms(); if (write(fd, "scan", 4) != 4) exit(1); sleep(1); while (current_time_ms() - start < 4 * 1000) sleep(1); if (write(fd, "scan", 4) != 4) exit(1); static char buf[128 << 10]; ssize_t n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); int nleaks = 0; if (n != 0) { sleep(1); if (write(fd, "scan", 4) != 4) exit(1); if (lseek(fd, 0, SEEK_SET) < 0) exit(1); n = read(fd, buf, sizeof(buf) - 1); if (n < 0) exit(1); buf[n] = 0; char* pos = buf; char* end = buf + n; while (pos < end) { char* next = strstr(pos + 1, "unreferenced object"); if (!next) next = end; char prev = *next; *next = 0; fprintf(stderr, "BUG: memory leak\n%s\n", pos); *next = prev; pos = next; nleaks++; } } if (write(fd, "clear", 5) != 5) exit(1); close(fd); if (nleaks) exit(1); } 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; } check_leaks(); } } uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(__NR_socket, 0x10ul, 3ul, 0xc); if (res != -1) r[0] = res; *(uint64_t*)0x20000700 = 0; *(uint32_t*)0x20000708 = 0; *(uint64_t*)0x20000710 = 0x200006c0; *(uint64_t*)0x200006c0 = 0x20000000; memcpy((void*)0x20000000, "\x24\x00\x00\x00\x03\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x08\x00\x19\x40\x00\x00\x00\x00\x08\xe1\x14\x40\x00\x00" "\x00\x00\x02\x69\xfe\xe7\xd7\xfe\xe6\x22\x9d\xd5\x1f\x3d\x75\x0f\xdf" "\x0a\x87\xf6\x1b\x81\x30\x4d\x65\x44\xbd\xaa\x89\x50\x78\xe2\xf0\x2b" "\x7a\xfa\x39\x0b\x0d\xe6\x86\x84\x72\x0a\xd7\xc3\x0d\x8c\x2b\x36\x26" "\x15\x21\x6c\x5d\xc7\x18\x81\x28\xd1\x5c\xfb\x7f\xe5\xa6\x2f\x5c\xe8" "\xfe\x44\xeb\x80\x1b\xd1\x6a\x56\xb1\x53\x10\x0a\x8b\xc4\x2d\xc3\xc0" "\x94\xeb\x27\x75\x84\x9f\xbf\x8e\x2f\xe9\x3f\xf4\x03\x06\xe7\x83\xf0" "\xff\x95\x73\x4f\xa1\xc6\xd4\x2c\xb4\x11\x6e\xdb\x24\x2d\xbc\xf1\x1c" "\x3a\x7e\xfd\x75\xcf\x98\x65\x2a\xef\xdc\xb1\xbd\x56\x5c\x12\x23\x87" "\xa4\x14\x07\x65\x4f\x53\x97\x22\x57\x96\x71\x39\xd4\xa3\x27", 185); *(uint64_t*)0x200006c8 = 0x24; *(uint64_t*)0x20000718 = 1; *(uint64_t*)0x20000720 = 0; *(uint64_t*)0x20000728 = 0; *(uint32_t*)0x20000730 = 0; syscall(__NR_sendmsg, r[0], 0x20000700ul, 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); setup_leak(); loop(); return 0; }