// https://syzkaller.appspot.com/bug?id=23e6694f4ebd520efc2d25f524547eff07d584fc // 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 #include #include #include #include #ifndef __NR_memfd_create #define __NR_memfd_create 319 #endif static unsigned long long procid; static __thread int clone_ongoing; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) { exit(sig); } uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0; int valid = addr < prog_start || addr > prog_end; if (skip && valid) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ ({ \ int ok = 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } else \ ok = 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) 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 void use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } static void thread_start(void* (*fn)(void*), void* arg) { pthread_t th; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); int i = 0; for (; i < 100; i++) { if (pthread_create(&th, &attr, fn, arg) == 0) { pthread_attr_destroy(&attr); return; } if (errno == EAGAIN) { usleep(50); continue; } break; } exit(1); } typedef struct { int state; } event_t; static void event_init(event_t* ev) { ev->state = 0; } static void event_reset(event_t* ev) { ev->state = 0; } static void event_set(event_t* ev) { if (ev->state) exit(1); __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000); } static void event_wait(event_t* ev) { while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); } static int event_isset(event_t* ev) { return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); } static int event_timedwait(event_t* ev, uint64_t timeout) { uint64_t start = current_time_ms(); uint64_t now = start; for (;;) { uint64_t remain = timeout - (now - start); struct timespec ts; ts.tv_sec = remain / 1000; ts.tv_nsec = (remain % 1000) * 1000 * 1000; syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; now = current_time_ms(); if (now - start > timeout) return 0; } } 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; } //% This code is derived from puff.{c,h}, found in the zlib development. The //% original files come with the following copyright notice: //% Copyright (C) 2002-2013 Mark Adler, all rights reserved //% version 2.3, 21 Jan 2013 //% This software is provided 'as-is', without any express or implied //% warranty. In no event will the author be held liable for any damages //% arising from the use of this software. //% Permission is granted to anyone to use this software for any purpose, //% including commercial applications, and to alter it and redistribute it //% freely, subject to the following restrictions: //% 1. The origin of this software must not be misrepresented; you must not //% claim that you wrote the original software. If you use this software //% in a product, an acknowledgment in the product documentation would be //% appreciated but is not required. //% 2. Altered source versions must be plainly marked as such, and must not be //% misrepresented as being the original software. //% 3. This notice may not be removed or altered from any source distribution. //% Mark Adler madler@alumni.caltech.edu //% BEGIN CODE DERIVED FROM puff.{c,h} #define MAXBITS 15 #define MAXLCODES 286 #define MAXDCODES 30 #define MAXCODES (MAXLCODES + MAXDCODES) #define FIXLCODES 288 struct puff_state { unsigned char* out; unsigned long outlen; unsigned long outcnt; const unsigned char* in; unsigned long inlen; unsigned long incnt; int bitbuf; int bitcnt; jmp_buf env; }; static int puff_bits(struct puff_state* s, int need) { long val = s->bitbuf; while (s->bitcnt < need) { if (s->incnt == s->inlen) longjmp(s->env, 1); val |= (long)(s->in[s->incnt++]) << s->bitcnt; s->bitcnt += 8; } s->bitbuf = (int)(val >> need); s->bitcnt -= need; return (int)(val & ((1L << need) - 1)); } static int puff_stored(struct puff_state* s) { s->bitbuf = 0; s->bitcnt = 0; if (s->incnt + 4 > s->inlen) return 2; unsigned len = s->in[s->incnt++]; len |= s->in[s->incnt++] << 8; if (s->in[s->incnt++] != (~len & 0xff) || s->in[s->incnt++] != ((~len >> 8) & 0xff)) return -2; if (s->incnt + len > s->inlen) return 2; if (s->outcnt + len > s->outlen) return 1; for (; len--; s->outcnt++, s->incnt++) { if (s->in[s->incnt]) s->out[s->outcnt] = s->in[s->incnt]; } return 0; } struct puff_huffman { short* count; short* symbol; }; static int puff_decode(struct puff_state* s, const struct puff_huffman* h) { int first = 0; int index = 0; int bitbuf = s->bitbuf; int left = s->bitcnt; int code = first = index = 0; int len = 1; short* next = h->count + 1; while (1) { while (left--) { code |= bitbuf & 1; bitbuf >>= 1; int count = *next++; if (code - count < first) { s->bitbuf = bitbuf; s->bitcnt = (s->bitcnt - len) & 7; return h->symbol[index + (code - first)]; } index += count; first += count; first <<= 1; code <<= 1; len++; } left = (MAXBITS + 1) - len; if (left == 0) break; if (s->incnt == s->inlen) longjmp(s->env, 1); bitbuf = s->in[s->incnt++]; if (left > 8) left = 8; } return -10; } static int puff_construct(struct puff_huffman* h, const short* length, int n) { int len; for (len = 0; len <= MAXBITS; len++) h->count[len] = 0; int symbol; for (symbol = 0; symbol < n; symbol++) (h->count[length[symbol]])++; if (h->count[0] == n) return 0; int left = 1; for (len = 1; len <= MAXBITS; len++) { left <<= 1; left -= h->count[len]; if (left < 0) return left; } short offs[MAXBITS + 1]; offs[1] = 0; for (len = 1; len < MAXBITS; len++) offs[len + 1] = offs[len] + h->count[len]; for (symbol = 0; symbol < n; symbol++) if (length[symbol] != 0) h->symbol[offs[length[symbol]]++] = symbol; return left; } static int puff_codes(struct puff_state* s, const struct puff_huffman* lencode, const struct puff_huffman* distcode) { static const short lens[29] = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31, 35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258}; static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0}; static const short dists[30] = { 1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193, 257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577}; static const short dext[30] = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 12, 12, 13, 13}; int symbol; do { symbol = puff_decode(s, lencode); if (symbol < 0) return symbol; if (symbol < 256) { if (s->outcnt == s->outlen) return 1; if (symbol) s->out[s->outcnt] = symbol; s->outcnt++; } else if (symbol > 256) { symbol -= 257; if (symbol >= 29) return -10; int len = lens[symbol] + puff_bits(s, lext[symbol]); symbol = puff_decode(s, distcode); if (symbol < 0) return symbol; unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]); if (dist > s->outcnt) return -11; if (s->outcnt + len > s->outlen) return 1; while (len--) { if (dist <= s->outcnt && s->out[s->outcnt - dist]) s->out[s->outcnt] = s->out[s->outcnt - dist]; s->outcnt++; } } } while (symbol != 256); return 0; } static int puff_fixed(struct puff_state* s) { static int virgin = 1; static short lencnt[MAXBITS + 1], lensym[FIXLCODES]; static short distcnt[MAXBITS + 1], distsym[MAXDCODES]; static struct puff_huffman lencode, distcode; if (virgin) { lencode.count = lencnt; lencode.symbol = lensym; distcode.count = distcnt; distcode.symbol = distsym; short lengths[FIXLCODES]; int symbol; for (symbol = 0; symbol < 144; symbol++) lengths[symbol] = 8; for (; symbol < 256; symbol++) lengths[symbol] = 9; for (; symbol < 280; symbol++) lengths[symbol] = 7; for (; symbol < FIXLCODES; symbol++) lengths[symbol] = 8; puff_construct(&lencode, lengths, FIXLCODES); for (symbol = 0; symbol < MAXDCODES; symbol++) lengths[symbol] = 5; puff_construct(&distcode, lengths, MAXDCODES); virgin = 0; } return puff_codes(s, &lencode, &distcode); } static int puff_dynamic(struct puff_state* s) { static const short order[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15}; int nlen = puff_bits(s, 5) + 257; int ndist = puff_bits(s, 5) + 1; int ncode = puff_bits(s, 4) + 4; if (nlen > MAXLCODES || ndist > MAXDCODES) return -3; short lengths[MAXCODES]; int index; for (index = 0; index < ncode; index++) lengths[order[index]] = puff_bits(s, 3); for (; index < 19; index++) lengths[order[index]] = 0; short lencnt[MAXBITS + 1], lensym[MAXLCODES]; struct puff_huffman lencode = {lencnt, lensym}; int err = puff_construct(&lencode, lengths, 19); if (err != 0) return -4; index = 0; while (index < nlen + ndist) { int symbol; int len; symbol = puff_decode(s, &lencode); if (symbol < 0) return symbol; if (symbol < 16) lengths[index++] = symbol; else { len = 0; if (symbol == 16) { if (index == 0) return -5; len = lengths[index - 1]; symbol = 3 + puff_bits(s, 2); } else if (symbol == 17) symbol = 3 + puff_bits(s, 3); else symbol = 11 + puff_bits(s, 7); if (index + symbol > nlen + ndist) return -6; while (symbol--) lengths[index++] = len; } } if (lengths[256] == 0) return -9; err = puff_construct(&lencode, lengths, nlen); if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1])) return -7; short distcnt[MAXBITS + 1], distsym[MAXDCODES]; struct puff_huffman distcode = {distcnt, distsym}; err = puff_construct(&distcode, lengths + nlen, ndist); if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1])) return -8; return puff_codes(s, &lencode, &distcode); } static int puff(unsigned char* dest, unsigned long* destlen, const unsigned char* source, unsigned long sourcelen) { struct puff_state s = { .out = dest, .outlen = *destlen, .outcnt = 0, .in = source, .inlen = sourcelen, .incnt = 0, .bitbuf = 0, .bitcnt = 0, }; int err; if (setjmp(s.env) != 0) err = 2; else { int last; do { last = puff_bits(&s, 1); int type = puff_bits(&s, 2); err = type == 0 ? puff_stored(&s) : (type == 1 ? puff_fixed(&s) : (type == 2 ? puff_dynamic(&s) : -1)); if (err != 0) break; } while (!last); } *destlen = s.outcnt; return err; } //% END CODE DERIVED FROM puff.{c,h} #define ZLIB_HEADER_WIDTH 2 static int puff_zlib_to_file(const unsigned char* source, unsigned long sourcelen, int dest_fd) { if (sourcelen < ZLIB_HEADER_WIDTH) return 0; source += ZLIB_HEADER_WIDTH; sourcelen -= ZLIB_HEADER_WIDTH; const unsigned long max_destlen = 132 << 20; void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0); if (ret == MAP_FAILED) return -1; unsigned char* dest = (unsigned char*)ret; unsigned long destlen = max_destlen; int err = puff(dest, &destlen, source, sourcelen); if (err) { munmap(dest, max_destlen); errno = -err; return -1; } if (write(dest_fd, dest, destlen) != (ssize_t)destlen) { munmap(dest, max_destlen); return -1; } return munmap(dest, max_destlen); } static int setup_loop_device(unsigned char* data, unsigned long size, const char* loopname, int* loopfd_p) { int err = 0, loopfd = -1; int memfd = syscall(__NR_memfd_create, "syzkaller", 0); if (memfd == -1) { err = errno; goto error; } if (puff_zlib_to_file(data, size, memfd)) { err = errno; goto error_close_memfd; } 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; } } close(memfd); *loopfd_p = loopfd; return 0; error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return -1; } static void reset_loop_device(const char* loopname) { int loopfd = open(loopname, O_RDWR); if (loopfd == -1) { return; } if (ioctl(loopfd, LOOP_CLR_FD, 0)) { } close(loopfd); } static long syz_mount_image(volatile long fsarg, volatile long dir, volatile long flags, volatile long optsarg, volatile long change_dir, volatile unsigned long size, volatile long image) { unsigned char* data = (unsigned char*)image; int res = -1, err = 0, need_loop_device = !!size; char* mount_opts = (char*)optsarg; char* target = (char*)dir; char* fs = (char*)fsarg; char* source = NULL; char loopname[64]; if (need_loop_device) { int loopfd; memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(data, size, loopname, &loopfd) == -1) return -1; close(loopfd); 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) { bool has_remount_ro = false; char* remount_ro_start = strstr(opts, "errors=remount-ro"); if (remount_ro_start != NULL) { char after = *(remount_ro_start + strlen("errors=remount-ro")); char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1); has_remount_ro = ((before == '\0' || before == ',') && (after == '\0' || after == ',')); } if (strstr(opts, "errors=panic") || !has_remount_ro) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } else if (strncmp(fs, "gfs2", 4) == 0 && (strstr(opts, "errors=panic") || strstr(opts, "debug"))) { strcat(opts, ",errors=withdraw"); } 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; goto error_clear_loop; } if (change_dir) { res = chdir(target); if (res == -1) { err = errno; } } error_clear_loop: if (need_loop_device) reset_loop_device(loopname); errno = err; return res; } #define FS_IOC_SETFLAGS _IOW('f', 2, long) static void remove_dir(const char* dir) { int iter = 0; DIR* dp = 0; const int umount_flags = MNT_FORCE | UMOUNT_NOFOLLOW; retry: while (umount2(dir, umount_flags) == 0) { } dp = opendir(dir); if (dp == NULL) { if (errno == EMFILE) { exit(1); } exit(1); } struct dirent* ep = 0; while ((ep = readdir(dp))) { if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) continue; char filename[FILENAME_MAX]; snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); while (umount2(filename, umount_flags) == 0) { } struct stat st; if (lstat(filename, &st)) exit(1); if (S_ISDIR(st.st_mode)) { remove_dir(filename); continue; } int i; for (i = 0;; i++) { if (unlink(filename) == 0) break; if (errno == EPERM) { int fd = open(filename, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno != EBUSY || i > 100) exit(1); if (umount2(filename, umount_flags)) exit(1); } } closedir(dp); for (int i = 0;; i++) { if (rmdir(dir) == 0) break; if (i < 100) { if (errno == EPERM) { int fd = open(dir, O_RDONLY); if (fd != -1) { long flags = 0; if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) { } close(fd); continue; } } if (errno == EROFS) { break; } if (errno == EBUSY) { if (umount2(dir, umount_flags)) exit(1); continue; } if (errno == ENOTEMPTY) { if (iter < 100) { iter++; goto retry; } } } exit(1); } } 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"); if (symlink("/dev/binderfs", "./binderfs")) { } } struct thread_t { int created, call; event_t ready, done; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { event_wait(&th->ready); event_reset(&th->ready); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); event_set(&th->done); } return 0; } static void execute_one(void) { if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } int i, call, thread; for (call = 0; call < 6; call++) { for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; event_init(&th->ready); event_init(&th->done); event_set(&th->done); thread_start(thr, th); } if (!event_isset(&th->done)) continue; event_reset(&th->done); th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); event_set(&th->ready); event_timedwait(&th->done, 50 + (call == 0 ? 4000 : 0) + (call == 2 ? 4000 : 0)); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { char cwdbuf[32]; sprintf(cwdbuf, "./%d", iter); if (mkdir(cwdbuf, 0777)) exit(1); reset_loop(); int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { if (chdir(cwdbuf)) exit(1); setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } remove_dir(cwdbuf); } } void execute_call(int call) { switch (call) { case 0: // syz_mount_image$ext4 arguments: [ // fs: ptr[in, buffer] { // buffer: {65 78 74 34 00} (length 0x5) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 62 75 73 00} (length 0x6) // } // flags: mount_flags = 0xe (8 bytes) // opts: ptr[in, fs_options[ext4_options]] { // fs_options[ext4_options] { // elems: array[fs_opt_elem[ext4_options]] { // fs_opt_elem[ext4_options] { // elem: union ext4_options { // bsddf: buffer: {62 73 64 64 66} (length 0x5) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // oldalloc: buffer: {6f 6c 64 61 6c 6c 6f 63} (length 0x8) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // resuid: fs_opt["resuid", fmt[hex, uid]] { // name: buffer: {72 65 73 75 69 64} (length 0x6) // eq: const = 0x3d (1 bytes) // val: uid (resource) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // debug_want_extra_isize: fs_opt["debug_want_extra_isize", // fmt[hex, int32]] { // name: buffer: {64 65 62 75 67 5f 77 61 6e 74 5f 65 78 74 // 72 61 5f 69 73 69 7a 65} (length 0x16) eq: const = 0x3d (1 // bytes) val: int32 = 0x80 (18 bytes) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // block_validity: buffer: {62 6c 6f 63 6b 5f 76 61 6c 69 64 69 // 74 79} (length 0xe) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // jqfmt_vfsv1: buffer: {6a 71 66 6d 74 3d 76 66 73 76 31} // (length 0xb) // } // comma: const = 0x2c (1 bytes) // } // } // common: array[fs_opt_elem[fs_options_common]] { // } // null: const = 0x0 (1 bytes) // } // } // chdir: int8 = 0x3 (1 bytes) // size: len = 0x447 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x447) // } // ] // returns fd_dir NONFAILING(memcpy((void*)0x200000000040, "ext4\000", 5)); NONFAILING(memcpy((void*)0x200000000000, "./bus\000", 6)); NONFAILING(memcpy((void*)0x200000000140, "bsddf", 5)); NONFAILING(*(uint8_t*)0x200000000145 = 0x2c); NONFAILING(memcpy((void*)0x200000000146, "oldalloc", 8)); NONFAILING(*(uint8_t*)0x20000000014e = 0x2c); NONFAILING(memcpy((void*)0x20000000014f, "resuid", 6)); NONFAILING(*(uint8_t*)0x200000000155 = 0x3d); NONFAILING(sprintf((char*)0x200000000156, "0x%016llx", (long long)0)); NONFAILING(*(uint8_t*)0x200000000168 = 0x2c); NONFAILING(memcpy((void*)0x200000000169, "debug_want_extra_isize", 22)); NONFAILING(*(uint8_t*)0x20000000017f = 0x3d); NONFAILING(sprintf((char*)0x200000000180, "0x%016llx", (long long)0x80)); NONFAILING(*(uint8_t*)0x200000000192 = 0x2c); NONFAILING(memcpy((void*)0x200000000193, "block_validity", 14)); NONFAILING(*(uint8_t*)0x2000000001a1 = 0x2c); NONFAILING(memcpy((void*)0x2000000001a2, "jqfmt=vfsv1", 11)); NONFAILING(*(uint8_t*)0x2000000001ad = 0x2c); NONFAILING(*(uint8_t*)0x2000000001ae = 0); NONFAILING(memcpy( (void*)0x200000000380, "\x78\x9c\xec\xdb\xcb\x6f\x1b\x45\x18\x00\xf0\x6f\xd7\x49\x4a\x5f\xc4" "\x94\xf2\xe8\x03\x08\x14\x44\xc4\x23\x69\xd2\x02\x3d\x70\x01\x81\xc4" "\x01\x24\x24\x38\x94\x63\x48\xd2\xaa\xd4\x6d\x50\x13\x24\x5a\x55\xb4" "\x20\x54\x8e\xa8\x12\x77\xc4\x81\x03\x12\x7f\x01\x27\xb8\x20\xe0\x84" "\xc4\x15\xee\xa8\x52\x85\x7a\x69\xe1\x64\xb4\xf6\x6e\x62\x3b\x76\x9a" "\x87\x13\x17\xfc\xfb\x49\xdb\xce\xec\xce\x6a\xe6\xf3\xee\xd8\x33\x3b" "\xd9\x00\xfa\xd6\x48\xf6\x4f\x12\xb1\x2b\x22\x7e\x8f\x88\xe1\x7a\xb6" "\xb9\xc0\x48\xfd\xbf\x5b\x37\x2e\x4e\xff\x7d\xe3\xe2\x74\x12\xd5\xea" "\x5b\x7f\x25\xb5\x72\x37\x6f\x5c\x9c\x2e\x8a\x16\xe7\xed\xcc\x33\xa3" "\x69\x44\xfa\x69\x12\x07\xda\xd4\x3b\x7f\xfe\xc2\xe9\xa9\x4a\x65\xf6" "\x5c\x9e\x1f\x5f\x38\xf3\xfe\xf8\xfc\xf9\x0b\xcf\x9e\x3a\x33\x75\x72" "\xf6\xe4\xec\xd9\xc9\x63\xc7\x8e\x1e\x99\x78\xe1\xf9\xc9\xe7\xba\x12" "\x67\xd6\xa6\x9b\xfb\x3f\x9a\x3b\xb8\xef\xb5\x77\xae\xbe\x31\x7d\xfc" "\xea\xbb\x3f\x7f\x9b\x14\xf1\xb7\xc4\xd1\x25\x23\x2b\x1d\x7c\xa2\x5a" "\xed\x72\x75\xbd\xb5\xbb\x21\x9d\x0c\xf4\xb0\x21\xac\x49\x29\x22\xb2" "\xcb\x35\x58\xeb\xff\xc3\x51\x8a\xa5\x8b\x37\x1c\xaf\x7e\xd2\xd3\xc6" "\x01\x9b\xaa\x5a\xad\x56\x77\x76\x3e\x7c\xb9\x0a\xfc\x8f\x25\xd1\xeb" "\x16\x00\xbd\x51\xfc\xd0\x67\xf3\xdf\x62\xdb\xa2\xa1\xc7\x1d\xe1\xfa" "\x4b\xf5\x09\x50\x16\xf7\xad\x7c\xab\x1f\x19\x88\x34\x2f\x33\xd8\x32" "\xbf\xed\xa6\x91\x88\x38\x7e\xf9\x9f\x2f\xb3\x2d\x36\xe7\x39\x04\x00" "\x40\x93\xef\xb3\xf1\xcf\x33\xed\xc6\x7f\x69\xdc\xdf\x50\xee\xee\x7c" "\x6d\xa8\x1c\x11\xf7\x44\xc4\x9e\x88\xb8\x37\x22\xf6\x46\xc4\x7d\x11" "\xb5\xb2\x0f\x44\xc4\x83\x6b\xac\xbf\x75\x91\x64\xf9\xf8\x27\xbd\xb6" "\xae\xc0\x56\x29\x1b\xff\xbd\x98\xaf\x6d\x35\x8f\xff\x8a\xd1\x5f\x94" "\x4b\x79\x6e\x77\x2d\xfe\xc1\xe4\xc4\xa9\xca\xec\xe1\xfc\x33\x19\x8d" "\xc1\x6d\x59\x7e\x62\x85\x3a\x7e\x78\xe5\xb7\xcf\x3b\x1d\x6b\x1c\xff" "\x65\x5b\x56\x7f\x31\x16\xcc\xdb\x71\x6d\x60\x5b\xf3\x39\x33\x53\x0b" "\x53\x1b\x89\xb9\xd1\xf5\x8f\x23\xf6\x0f\xb4\x8b\x3f\x59\x5c\x09\x48" "\x22\x62\x5f\x44\xec\x5f\x67\x1d\xa7\x9e\xfa\xe6\x60\xa7\x63\xb7\x8f" "\x7f\x05\x5d\x58\x67\xaa\x7e\x15\xf1\x64\xfd\xfa\x5f\x8e\x96\xf8\x0b" "\xc9\xca\xeb\x93\xe3\x77\x45\x65\xf6\xf0\x78\x71\x57\x2c\xf7\xcb\xaf" "\x57\xde\xec\x54\xff\x86\xe2\xef\x82\xec\xfa\xef\x68\x7b\xff\x2f\xc6" "\x5f\x4e\x1a\xd7\x6b\xe7\xd7\x5e\xc7\x95\x3f\x3e\xeb\x38\xa7\x59\xdd" "\xfd\x5f\xbd\xd4\x78\x4e\x76\xff\x0f\x25\x6f\xd7\xd2\x43\xf9\xbe\x0f" "\xa7\x16\x16\xce\x4d\x44\x0c\x25\xaf\xd7\x1b\xdd\xb8\x7f\x72\xe9\xdc" "\x22\x5f\x94\xcf\xe2\x1f\x3d\xd4\xbe\xff\xef\x89\xa5\x4f\xe2\x40\x44" "\x64\x37\xf1\x43\x11\xf1\x70\x44\x3c\x92\xb7\xfd\xd1\x88\x78\x2c\x22" "\x0e\xad\x10\xff\x4f\x2f\x3f\xfe\xde\xfa\xe3\xdf\x5c\x59\xfc\x33\x6b" "\xba\xfe\x4b\x89\xa1\x68\xdd\xd3\x3e\x51\x3a\xfd\xe3\x77\x4d\x95\x96" "\xd7\x12\x7f\x76\xfd\x8f\xd6\x52\xa3\xf9\x9e\xd5\x7c\xff\xad\xa6\x5d" "\xeb\xbb\x9b\x01\x00\x00\xe0\xbf\x27\x8d\x88\x5d\x91\xa4\x63\x8b\xe9" "\x34\x1d\x1b\xab\xff\xbd\xfc\xde\xd8\x91\x56\xe6\xe6\x17\x9e\x3e\x31" "\xf7\xc1\xd9\x99\xfa\x3b\x02\xe5\x18\x4c\x8b\x27\x5d\xc3\x0d\xcf\x43" "\x27\xf2\x69\x7d\x91\x9f\x8c\xf8\xba\x31\x7f\x24\x7f\x6e\xfc\x45\x69" "\x7b\x2d\x3f\x36\x3d\x57\x99\xe9\x75\xf0\xd0\xe7\x76\x76\xe8\xff\x99" "\x3f\x4b\xbd\x6e\x1d\xb0\xe9\xbc\xaf\x05\xfd\x4b\xff\x87\xfe\xa5\xff" "\x43\xff\xd2\xff\xa1\x7f\xb5\xe9\xff\xdb\x7b\xd1\x0e\x60\xeb\xb5\xfb" "\xfd\xbf\xd4\x83\x76\x00\x5b\xaf\xa5\xff\x5b\xf6\x83\x3e\x62\xfe\x0f" "\xfd\x4b\xff\x87\xfe\xa5\xff\x43\x5f\x9a\xdf\x1e\xb7\x7f\x49\x5e\x42" "\x62\x59\x22\xd2\x3b\xa2\x19\x12\xdd\x49\xa4\x11\xd1\xb4\x67\xf9\x77" "\x45\xb9\x17\x5f\x50\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1b\xf4\x6f\x00\x00" "\x00\xff\xff\x37\xd6\xe7\x41", 1095)); NONFAILING(syz_mount_image(/*fs=*/0x200000000040, /*dir=*/0x200000000000, /*flags=MS_NOSUID|MS_NOEXEC|MS_NODEV*/ 0xe, /*opts=*/0x200000000140, /*chdir=*/3, /*size=*/0x447, /*img=*/0x200000000380)); break; case 1: // creat arguments: [ // file: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 32 00} (length 0x8) // } // mode: open_mode = 0x71283578ac7c5cd (8 bytes) // ] // returns fd NONFAILING(memcpy((void*)0x200000000180, "./file2\000", 8)); syscall( __NR_creat, /*file=*/0x200000000180ul, /*mode=S_IXOTH|S_IROTH|S_IXGRP|S_IXUSR|S_IWUSR|S_IRUSR|0x71283578ac7c400*/ 0x71283578ac7c5cdul); break; case 2: // syz_mount_image$exfat arguments: [ // fs: nil // dir: ptr[in, buffer] { // buffer: {2e 2f 62 75 73 00} (length 0x6) // } // flags: mount_flags = 0x448c (8 bytes) // opts: nil // chdir: int8 = 0x0 (1 bytes) // size: len = 0x0 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x0) // } // ] // returns fd_dir NONFAILING(memcpy((void*)0x200000000300, "./bus\000", 6)); NONFAILING(syz_mount_image( /*fs=*/0, /*dir=*/0x200000000300, /*flags=MS_REC|MS_NOEXEC|MS_NODEV|MS_NOATIME|0x80*/ 0x448c, /*opts=*/0, /*chdir=*/0, /*size=*/0, /*img=*/0x200000000300)); break; case 3: // chdir arguments: [ // dir: ptr[in, buffer] { // buffer: {2e 2f 62 75 73 00} (length 0x6) // } // ] NONFAILING(memcpy((void*)0x2000000001c0, "./bus\000", 6)); syscall(__NR_chdir, /*dir=*/0x2000000001c0ul); break; case 4: // mkdirat arguments: [ // fd: fd_dir (resource) // path: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // mode: open_mode = 0x0 (8 bytes) // ] NONFAILING(memcpy((void*)0x200000000100, "./file0\000", 8)); syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x200000000100ul, /*mode=*/0ul); break; case 5: // rmdir arguments: [ // path: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // ] NONFAILING(memcpy((void*)0x200000000000, "./file0\000", 8)); syscall(__NR_rmdir, /*path=*/0x200000000000ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; install_segv_handler(); for (procid = 0; procid < 5; procid++) { if (fork() == 0) { use_temporary_dir(); loop(); } } sleep(1000000); return 0; }