// https://syzkaller.appspot.com/bug?id=7e8739307ccbbc3219b5b7c398ffae51e9fc315b // 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 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; } struct fs_image_segment { void* data; uintptr_t size; uintptr_t offset; }; #define IMAGE_MAX_SEGMENTS 4096 #define IMAGE_MAX_SIZE (129 << 20) #define sys_memfd_create 319 static unsigned long fs_image_segment_check(unsigned long size, unsigned long nsegs, struct fs_image_segment* segs) { if (nsegs > IMAGE_MAX_SEGMENTS) nsegs = IMAGE_MAX_SEGMENTS; for (size_t i = 0; i < nsegs; i++) { if (segs[i].size > IMAGE_MAX_SIZE) segs[i].size = IMAGE_MAX_SIZE; segs[i].offset %= IMAGE_MAX_SIZE; if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size) segs[i].offset = IMAGE_MAX_SIZE - segs[i].size; if (size < segs[i].offset + segs[i].offset) size = segs[i].offset + segs[i].offset; } if (size > IMAGE_MAX_SIZE) size = IMAGE_MAX_SIZE; return size; } static int setup_loop_device(long unsigned size, long unsigned nsegs, struct fs_image_segment* segs, const char* loopname, int* memfd_p, int* loopfd_p) { int err = 0, loopfd = -1; size = fs_image_segment_check(size, nsegs, segs); int memfd = syscall(sys_memfd_create, "syzkaller", 0); if (memfd == -1) { err = errno; goto error; } if (ftruncate(memfd, size)) { err = errno; goto error_close_memfd; } for (size_t i = 0; i < nsegs; i++) { if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) { } } loopfd = open(loopname, O_RDWR); if (loopfd == -1) { err = errno; goto error_close_memfd; } if (ioctl(loopfd, LOOP_SET_FD, memfd)) { if (errno != EBUSY) { err = errno; goto error_close_loop; } ioctl(loopfd, LOOP_CLR_FD, 0); usleep(1000); if (ioctl(loopfd, LOOP_SET_FD, memfd)) { err = errno; goto error_close_loop; } } *memfd_p = memfd; *loopfd_p = loopfd; return 0; error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return -1; } static long syz_mount_image(volatile long fsarg, volatile long dir, volatile unsigned long size, volatile unsigned long nsegs, volatile long segments, volatile long flags, volatile long optsarg) { struct fs_image_segment* segs = (struct fs_image_segment*)segments; int res = -1, err = 0, loopfd = -1, memfd = -1, need_loop_device = !!segs; char* mount_opts = (char*)optsarg; char* target = (char*)dir; char* fs = (char*)fsarg; char* source = NULL; char loopname[64]; if (need_loop_device) { memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(size, nsegs, segs, loopname, &memfd, &loopfd) == -1) return -1; source = loopname; } mkdir(target, 0777); char opts[256]; memset(opts, 0, sizeof(opts)); if (strlen(mount_opts) > (sizeof(opts) - 32)) { } strncpy(opts, mount_opts, sizeof(opts) - 32); if (strcmp(fs, "iso9660") == 0) { flags |= MS_RDONLY; } else if (strncmp(fs, "ext", 3) == 0) { if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } res = mount(source, target, fs, flags, opts); if (res == -1) { err = errno; goto error_clear_loop; } res = open(target, O_RDONLY | O_DIRECTORY); if (res == -1) { err = errno; } error_clear_loop: if (need_loop_device) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); close(memfd); } errno = err; return res; } 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 reset_loop() { char buf[64]; snprintf(buf, sizeof(buf), "/dev/loop%llu", procid); int loopfd = open(buf, O_RDWR); if (loopfd != -1) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } } 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 = 0; for (;; iter++) { reset_loop(); 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(); } } void execute_one(void) { memcpy((void*)0x20000000, "nilfs2\000", 7); memcpy((void*)0x20000100, "./file0\000", 8); *(uint64_t*)0x20000200 = 0x20010000; memcpy((void*)0x20010000, "\x02\x00\x00\x00\x00\x00\x34\x34\x18\x01\x00\x00\x7a\x4a\x79\x34\x9d" "\xb4\xb8\xdc\x01\x00\x00\x00\x1f\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x10\x00\x00\x00\x00\x00\x02\x00\x00\x00\x00\x00\x00\x00\x10\x00\x00" "\x00\x05\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x02\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x01\x00\x00\x00" "\x00\x00\x00\x56\x1b\x67\x5f\x00\x00\x00\x00\x57\x1b\x67\x5f\x00\x00" "\x00\x00\x57\x1b\x67\x5f\x00\x00\x00\x00\x01\x00\x32\x00\x00\x00\x01" "\x00\x56\x1b\x67\x5f\x00\x00\x00\x00\x00\x4e\xed\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x0b\x00\x00\x00\x80\x00\x20\x00\xc0\x00\x10\x00\xd5" "\xe9\xc4\x44\xac\x62\x4a\x73\xaa\x02\xcb\xe5\xd9\x66\x0a\xa5\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00", 192); *(uint64_t*)0x20000208 = 0xc0; *(uint64_t*)0x20000210 = 0x400; *(uint64_t*)0x20000218 = 0; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0x1000; *(uint64_t*)0x20000230 = 0; *(uint64_t*)0x20000238 = 0; *(uint64_t*)0x20000240 = 0x1800; *(uint64_t*)0x20000248 = 0; *(uint64_t*)0x20000250 = 0; *(uint64_t*)0x20000258 = 0x2000; *(uint64_t*)0x20000260 = 0; *(uint64_t*)0x20000268 = 0; *(uint64_t*)0x20000270 = 0x3080; *(uint64_t*)0x20000278 = 0; *(uint64_t*)0x20000280 = 0; *(uint64_t*)0x20000288 = 0x3100; *(uint64_t*)0x20000290 = 0; *(uint64_t*)0x20000298 = 0; *(uint64_t*)0x200002a0 = 0x3380; *(uint64_t*)0x200002a8 = 0; *(uint64_t*)0x200002b0 = 0; *(uint64_t*)0x200002b8 = 0x3400; *(uint64_t*)0x200002c0 = 0; *(uint64_t*)0x200002c8 = 0; *(uint64_t*)0x200002d0 = 0x3480; *(uint64_t*)0x200002d8 = 0; *(uint64_t*)0x200002e0 = 0; *(uint64_t*)0x200002e8 = 0x3500; *(uint64_t*)0x200002f0 = 0; *(uint64_t*)0x200002f8 = 0; *(uint64_t*)0x20000300 = 0x3580; *(uint64_t*)0x20000308 = 0; *(uint64_t*)0x20000310 = 0; *(uint64_t*)0x20000318 = 0x3800; *(uint64_t*)0x20000320 = 0; *(uint64_t*)0x20000328 = 0; *(uint64_t*)0x20000330 = 0x38c0; *(uint64_t*)0x20000338 = 0; *(uint64_t*)0x20000340 = 0; *(uint64_t*)0x20000348 = 0x3a40; *(uint64_t*)0x20000350 = 0; *(uint64_t*)0x20000358 = 0; *(uint64_t*)0x20000360 = 0x3b00; *(uint64_t*)0x20000368 = 0; *(uint64_t*)0x20000370 = 0; *(uint64_t*)0x20000378 = 0x3bc0; *(uint64_t*)0x20000380 = 0; *(uint64_t*)0x20000388 = 0; *(uint64_t*)0x20000390 = 0x3c80; *(uint64_t*)0x20000398 = 0; *(uint64_t*)0x200003a0 = 0; *(uint64_t*)0x200003a8 = 0x3d40; *(uint64_t*)0x200003b0 = 0; *(uint64_t*)0x200003b8 = 0; *(uint64_t*)0x200003c0 = 0x3e00; *(uint64_t*)0x200003c8 = 0; *(uint64_t*)0x200003d0 = 0; *(uint64_t*)0x200003d8 = 0x3ec0; *(uint64_t*)0x200003e0 = 0; *(uint64_t*)0x200003e8 = 0; *(uint64_t*)0x200003f0 = 0x4000; *(uint64_t*)0x200003f8 = 0; *(uint64_t*)0x20000400 = 0; *(uint64_t*)0x20000408 = 0x4800; *(uint64_t*)0x20000410 = 0; *(uint64_t*)0x20000418 = 0; *(uint64_t*)0x20000420 = 0x5820; *(uint64_t*)0x20000428 = 0; *(uint64_t*)0x20000430 = 0; *(uint64_t*)0x20000438 = 0x6000; *(uint64_t*)0x20000440 = 0; *(uint64_t*)0x20000448 = 0; *(uint64_t*)0x20000450 = 0x6800; *(uint64_t*)0x20000458 = 0; *(uint64_t*)0x20000460 = 0; *(uint64_t*)0x20000468 = 0x7000; *(uint64_t*)0x20000470 = 0; *(uint64_t*)0x20000478 = 0; *(uint64_t*)0x20000480 = 0x7800; *(uint64_t*)0x20000488 = 0; *(uint64_t*)0x20000490 = 0; *(uint64_t*)0x20000498 = 0x8000; *(uint64_t*)0x200004a0 = 0; *(uint64_t*)0x200004a8 = 0; *(uint64_t*)0x200004b0 = 0x8800; *(uint64_t*)0x200004b8 = 0; *(uint64_t*)0x200004c0 = 0; *(uint64_t*)0x200004c8 = 0x9000; *(uint64_t*)0x200004d0 = 0; *(uint64_t*)0x200004d8 = 0; *(uint64_t*)0x200004e0 = 0x9800; *(uint64_t*)0x200004e8 = 0; *(uint64_t*)0x200004f0 = 0; *(uint64_t*)0x200004f8 = 0xc800; *(uint64_t*)0x20000500 = 0; *(uint64_t*)0x20000508 = 0; *(uint64_t*)0x20000510 = 0xd000; *(uint64_t*)0x20000518 = 0; *(uint64_t*)0x20000520 = 0; *(uint64_t*)0x20000528 = 0xe080; *(uint64_t*)0x20000530 = 0; *(uint64_t*)0x20000538 = 0; *(uint64_t*)0x20000540 = 0xe100; *(uint64_t*)0x20000548 = 0; *(uint64_t*)0x20000550 = 0; *(uint64_t*)0x20000558 = 0xe380; *(uint64_t*)0x20000560 = 0; *(uint64_t*)0x20000568 = 0; *(uint64_t*)0x20000570 = 0xe400; *(uint64_t*)0x20000578 = 0; *(uint64_t*)0x20000580 = 0; *(uint64_t*)0x20000588 = 0xe480; *(uint64_t*)0x20000590 = 0; *(uint64_t*)0x20000598 = 0; *(uint64_t*)0x200005a0 = 0xe500; *(uint64_t*)0x200005a8 = 0; *(uint64_t*)0x200005b0 = 0; *(uint64_t*)0x200005b8 = 0xe580; *(uint64_t*)0x200005c0 = 0; *(uint64_t*)0x200005c8 = 0; *(uint64_t*)0x200005d0 = 0xe600; *(uint64_t*)0x200005d8 = 0; *(uint64_t*)0x200005e0 = 0; *(uint64_t*)0x200005e8 = 0xf000; *(uint64_t*)0x200005f0 = 0; *(uint64_t*)0x200005f8 = 0; *(uint64_t*)0x20000600 = 0xf0c0; *(uint64_t*)0x20000608 = 0; *(uint64_t*)0x20000610 = 0; *(uint64_t*)0x20000618 = 0xf180; *(uint64_t*)0x20000620 = 0; *(uint64_t*)0x20000628 = 0; *(uint64_t*)0x20000630 = 0xf300; *(uint64_t*)0x20000638 = 0; *(uint64_t*)0x20000640 = 0; *(uint64_t*)0x20000648 = 0xf3c0; *(uint64_t*)0x20000650 = 0; *(uint64_t*)0x20000658 = 0; *(uint64_t*)0x20000660 = 0xf480; *(uint64_t*)0x20000668 = 0; *(uint64_t*)0x20000670 = 0; *(uint64_t*)0x20000678 = 0xf540; *(uint64_t*)0x20000680 = 0; *(uint64_t*)0x20000688 = 0; *(uint64_t*)0x20000690 = 0xf600; *(uint64_t*)0x20000698 = 0; *(uint64_t*)0x200006a0 = 0; *(uint64_t*)0x200006a8 = 0xf6c0; *(uint64_t*)0x200006b0 = 0; *(uint64_t*)0x200006b8 = 0; *(uint64_t*)0x200006c0 = 0xf800; *(uint64_t*)0x200006c8 = 0; *(uint64_t*)0x200006d0 = 0; *(uint64_t*)0x200006d8 = 0x10000; *(uint64_t*)0x200006e0 = 0; *(uint64_t*)0x200006e8 = 0; *(uint64_t*)0x200006f0 = 0x10800; *(uint64_t*)0x200006f8 = 0; *(uint64_t*)0x20000700 = 0; *(uint64_t*)0x20000708 = 0x11100; *(uint64_t*)0x20000710 = 0; *(uint64_t*)0x20000718 = 0; *(uint64_t*)0x20000720 = 0x11400; *(uint64_t*)0x20000728 = 0; *(uint64_t*)0x20000730 = 0; *(uint64_t*)0x20000738 = 0x11500; *(uint64_t*)0x20000740 = 0; *(uint64_t*)0x20000748 = 0; *(uint64_t*)0x20000750 = 0x11600; *(uint64_t*)0x20000758 = 0; *(uint64_t*)0x20000760 = 0; *(uint64_t*)0x20000768 = 0x11700; *(uint64_t*)0x20000770 = 0; *(uint64_t*)0x20000778 = 0; *(uint64_t*)0x20000780 = 0x11820; *(uint64_t*)0x20000788 = 0; *(uint64_t*)0x20000790 = 0; *(uint64_t*)0x20000798 = 0x12000; *(uint64_t*)0x200007a0 = 0; *(uint64_t*)0x200007a8 = 0; *(uint64_t*)0x200007b0 = 0x12800; *(uint64_t*)0x200007b8 = 0; *(uint64_t*)0x200007c0 = 0; *(uint64_t*)0x200007c8 = 0x13000; *(uint64_t*)0x200007d0 = 0; *(uint64_t*)0x200007d8 = 0; *(uint64_t*)0x200007e0 = 0x13800; *(uint64_t*)0x200007e8 = 0; *(uint64_t*)0x200007f0 = 0; *(uint64_t*)0x200007f8 = 0x14000; *(uint64_t*)0x20000800 = 0; *(uint64_t*)0x20000808 = 0; *(uint64_t*)0x20000810 = 0x14800; *(uint64_t*)0x20000818 = 0; *(uint64_t*)0x20000820 = 0; *(uint64_t*)0x20000828 = 0x14c00; *(uint64_t*)0x20000830 = 0; *(uint64_t*)0x20000838 = 0; *(uint64_t*)0x20000840 = 0x15000; *(uint64_t*)0x20000848 = 0; *(uint64_t*)0x20000850 = 0; *(uint64_t*)0x20000858 = 0xff000; *(uint8_t*)0x20017300 = 0; syz_mount_image(0x20000000, 0x20000100, 0x100000, 0x44, 0x20000200, 0, 0x20017300); } 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; }