// https://syzkaller.appspot.com/bug?id=071b81e67408485814f5a4618e376182be160a3b // 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); if (call == 0) break; event_timedwait(&th->done, 50 + (call == 0 ? 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); } } uint64_t r[1] = {0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; 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 02 00} (length 0x3) // } // flags: mount_flags = 0x0 (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 { // usrquota: buffer: {75 73 72 71 75 6f 74 61} (length 0x8) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // debug: buffer: {64 65 62 75 67} (length 0x5) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // norecovery: buffer: {6e 6f 72 65 63 6f 76 65 72 79} (length // 0xa) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // nojournal_checksum: buffer: {6e 6f 6a 6f 75 72 6e 61 6c 5f // 63 68 65 63 6b 73 75 6d} (length 0x12) // } // 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) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // usrjquota: buffer: {75 73 72 6a 71 75 6f 74 61 3d} (length // 0xa) // } // comma: const = 0x2c (1 bytes) // } // } // common: array[fs_opt_elem[fs_options_common]] { // } // null: const = 0x0 (1 bytes) // } // } // chdir: int8 = 0xff (1 bytes) // size: len = 0x44d (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x44d) // } // ] // returns fd_dir NONFAILING(memcpy((void*)0x200000000080, "ext4\000", 5)); NONFAILING(memcpy((void*)0x200000000480, ".\002\000", 3)); NONFAILING(memcpy((void*)0x200000000640, "usrquota", 8)); NONFAILING(*(uint8_t*)0x200000000648 = 0x2c); NONFAILING(memcpy((void*)0x200000000649, "debug", 5)); NONFAILING(*(uint8_t*)0x20000000064e = 0x2c); NONFAILING(memcpy((void*)0x20000000064f, "norecovery", 10)); NONFAILING(*(uint8_t*)0x200000000659 = 0x2c); NONFAILING(memcpy((void*)0x20000000065a, "nojournal_checksum", 18)); NONFAILING(*(uint8_t*)0x20000000066c = 0x2c); NONFAILING(memcpy((void*)0x20000000066d, "jqfmt=vfsv1", 11)); NONFAILING(*(uint8_t*)0x200000000678 = 0x2c); NONFAILING(memcpy((void*)0x200000000679, "usrjquota=", 10)); NONFAILING(*(uint8_t*)0x200000000683 = 0x2c); NONFAILING(*(uint8_t*)0x200000000684 = 0); NONFAILING(memcpy( (void*)0x200000000900, "\x78\x9c\xec\xdc\xcb\x6f\x1b\xc5\x1f\x00\xf0\xef\xae\x9d\xf4\xfd\x4b" "\x7e\x50\x1e\x2d\x2d\x04\x0a\xa2\xe2\x91\x34\xe9\xf3\xc0\xa5\x08\x24" "\x0e\x20\x21\xc1\xa1\x88\x53\x48\xd2\xaa\xd4\x6d\xa0\x09\x12\xad\x2a" "\x28\x1c\xca\x11\x55\xe2\x8e\x38\x22\xf1\x17\x70\x82\x0b\x02\x4e\x48" "\x5c\xe1\x8e\x2a\x55\xa8\x97\x16\x24\x24\xa3\x5d\xef\xa6\xc6\xb5\xd3" "\xb8\x71\xea\xb6\xfe\x7c\xa4\x4d\x66\xbc\xe3\xcc\x7c\x77\x77\xec\xd9" "\x19\x3b\x01\x0c\xac\xb1\xec\x47\x12\xb1\x39\x22\x7e\x8b\x88\x91\x46" "\xf6\xbf\x05\xc6\x1a\xbf\xae\x5d\x39\x37\xf3\xd7\x95\x73\x33\x49\xd4" "\xeb\x6f\xfc\x99\xe4\xe5\xae\x5e\x39\x37\x53\x16\x2d\x9f\xb7\xa9\x91" "\xa9\xd7\x8b\xfc\xba\x36\xf5\x5e\x78\x3b\x62\xba\x56\x9b\x3b\x5d\xe4" "\x27\x16\x4f\xbe\x37\xb1\x70\xe6\xec\xf3\xc7\x4f\x4e\x1f\x9b\x3b\x36" "\x77\x6a\xea\xd0\xa1\x7d\x7b\x77\x0e\x1f\x98\xda\xdf\x93\x38\xb3\xb8" "\xae\x6e\xff\x68\x7e\xc7\xb6\x57\xde\xba\xf8\xda\xcc\x91\x8b\xef\xfc" "\xf4\x4d\xd6\xde\xcd\xc5\xfe\xe6\x38\x7a\x65\xac\x71\x74\xdb\x7a\xaa" "\xd7\x95\xf5\xd9\x96\xa6\x74\x52\xed\x63\x43\xe8\x4a\x25\x22\xb2\xd3" "\x35\x94\xf7\xff\x91\xa8\xc4\x86\xa5\x7d\x23\xf1\xf2\xa7\x7d\x6d\x1c" "\xb0\xa6\xea\xf5\x7a\xbd\xdd\xfb\x73\xe1\x7c\x1d\xb8\x87\x25\xd1\xef" "\x16\x00\xfd\x51\xbe\xd1\x67\xf7\xbf\xe5\x76\x9b\x86\x1e\x77\x84\xcb" "\x87\x23\xde\x3f\xd8\x88\xff\x5a\xb1\x35\xf6\x54\x23\x2d\xca\x0c\xb5" "\xdc\xdf\xf6\xd2\x58\x44\x1c\x39\xff\xf7\x97\xd9\x16\x6b\x34\x0f\x01" "\x00\xd0\xec\xbb\xc3\x11\xf1\x5c\xbb\xf1\x5f\x1a\x0f\x36\x95\xfb\x5f" "\xb1\x86\x32\x1a\x11\xff\x8f\x88\xfb\x22\xe2\xfe\x88\xd8\x1a\x11\x0f" "\x44\xe4\x65\x1f\x8a\x88\x87\xbb\xac\xbf\x75\x85\xe4\xc6\xf1\x4f\x7a" "\xe9\x96\x02\x5b\xa1\x6c\xfc\xf7\x42\xb1\xb6\xb5\x34\xfe\xfb\xa7\x9e" "\xc7\x5f\x18\xad\x14\xb9\x2d\x79\xfc\x43\xc9\xd1\xe3\xb5\xb9\x3d\xc5" "\x31\xd9\x1d\x43\xeb\xb2\xfc\xe4\x32\x75\x7c\xff\xd2\xaf\x9f\x77\xda" "\xd7\x3c\xfe\xcb\xb6\xac\xfe\x72\x2c\xd8\x90\x5e\xaa\xb6\x4c\xd0\xcd" "\x4e\x2f\x4e\xaf\x32\xec\x25\x97\x3f\x89\xd8\x5e\x6d\x89\x3f\x97\x44" "\xb9\x8c\x93\x44\xc4\xb6\x88\xd8\xde\xd5\x5f\xbe\x7e\x87\x71\xfc\x99" "\xaf\x77\x74\x2a\x75\xf3\xf8\x97\xd1\x83\x75\xa6\xfa\x57\x11\x4f\x37" "\xce\xff\xf9\x68\x89\xbf\x94\x74\x5c\x9f\x9c\x3c\x78\x60\x6a\xff\xc4" "\xfa\xa8\xcd\xed\x99\x28\xaf\x8a\x1b\xfd\xfc\xcb\x85\xd7\x3b\xd5\xbf" "\xaa\xf8\x7b\x20\x3b\xff\x1b\x5b\xaf\xff\xdc\x52\xfc\xa3\xc9\xfa\x88" "\x85\x33\x67\x4f\xe4\xeb\xb5\x0b\xdd\xd7\x71\xe1\xf7\xcf\x3a\xde\xd3" "\xdc\xea\xf5\x3f\x9c\xbc\x99\xa7\x87\x8b\xc7\x3e\x9c\x5e\x5c\x3c\x3d" "\x19\x31\x9c\xbc\x7a\xe3\xe3\x53\xd7\x9f\x5b\xe6\xcb\xf2\x59\xfc\xbb" "\x77\xb5\x8b\x3f\xcd\x5f\xe3\xca\x23\xf1\x48\x44\x64\x17\xf1\xce\x88" "\x78\x34\x22\x1e\x2b\xda\xfe\x78\x44\x3c\x11\x11\xbb\x96\x89\xff\xc7" "\x17\x9f\x7c\xb7\xfb\xf8\x97\x99\x95\xef\xa1\x2c\xfe\xd9\x9b\x9d\xff" "\x68\x3e\xff\xdd\x27\x2a\x27\x7e\xf8\xb6\xfb\xf8\x4b\xd9\xf9\xdf\x97" "\xa7\x76\x17\x8f\xac\xe4\xf5\x6f\xa5\x0d\x5c\xcd\xb1\x03\x00\x00\x80" "\xbb\x45\x9a\x7f\x06\x3e\x49\xc7\x97\xd2\x69\x3a\x3e\xde\xf8\x0c\xff" "\xd6\xd8\x98\xd6\xe6\x17\x16\x9f\x3d\x3a\xff\xc1\xa9\xd9\xc6\x67\xe5" "\x47\x63\x28\x2d\x67\xba\x46\x9a\xe6\x43\x27\x8b\xb9\xe1\x32\x3f\xd5" "\x92\xdf\x5b\xcc\x1b\x7f\x51\xd9\x90\xe7\xc7\x67\xe6\x6b\xb3\xfd\x0e" "\x1e\x06\xdc\xa6\x0e\xfd\x3f\xf3\x47\xa5\xdf\xad\x03\xd6\x9c\xef\x6b" "\xc1\xe0\xd2\xff\x61\x70\xe9\xff\x30\xb8\xf4\x7f\x18\x5c\xfa\x3f\x0c" "\xae\x76\xfd\xff\xe3\x3e\xb4\x03\xb8\xfd\xbc\xff\xc3\xe0\xd2\xff\x61" "\x70\xe9\xff\x30\xb8\xf4\x7f\x18\x48\x1d\xbf\x1b\x9f\xae\xea\x2b\xff" "\x12\xf7\x7c\x22\xd2\xee\x9f\x55\x8d\x3b\xa4\xf1\x77\x53\xa2\xba\xe2" "\x7f\x66\x71\x8b\x89\x75\x6d\x77\xf5\xfb\x95\x09\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\xa0\x37\xfe\x0d\x00\x00\xff\xff\x57\xe2\xee\x2f", 1101)); NONFAILING(syz_mount_image(/*fs=*/0x200000000080, /*dir=*/0x200000000480, /*flags=*/0, /*opts=*/0x200000000640, /*chdir=*/-1, /*size=*/0x44d, /*img=*/0x200000000900)); break; case 1: // quotactl$Q_QUOTAON arguments: [ // cmd: quota_cmd_quota_on = 0xffffffff80000201 (8 bytes) // special: ptr[in, blockdev_filename] { // union blockdev_filename { // loop: loop_filename { // prefix: buffer: {2f 64 65 76 2f 6c 6f 6f 70} (length 0x9) // id: proc = 0x0 (1 bytes) // z: const = 0x0 (1 bytes) // } // } // } // id: uid (resource) // addr: nil // ] NONFAILING(memcpy((void*)0x200000000180, "/dev/loop", 9)); NONFAILING(*(uint8_t*)0x200000000189 = 0x30); NONFAILING(*(uint8_t*)0x20000000018a = 0); syscall(__NR_quotactl, /*cmd=Q_QUOTAON_GRP*/ 0xffffffff80000201ul, /*special=*/0x200000000180ul, /*id=*/0, /*addr=*/0ul); break; case 2: // mprotect arguments: [ // addr: VMA[0x3000] // len: len = 0x3000 (8 bytes) // prot: mmap_prot = 0x9 (8 bytes) // ] syscall(__NR_mprotect, /*addr=*/0x200000000000ul, /*len=*/0x3000ul, /*prot=PROT_SEM|PROT_READ*/ 9ul); break; case 3: // openat$cgroup_ro arguments: [ // fd: fd_cgroup (resource) // file: ptr[in, buffer] { // buffer: {68 75 67 65 74 6c 62 2e 31 47 42 2e 75 73 61 67 65 5f 69 6e // 5f 62 79 74 65 73 00} (length 0x1b) // } // flags: const = 0x275a (4 bytes) // mode: const = 0x0 (2 bytes) // ] // returns fd NONFAILING( memcpy((void*)0x200000000180, "hugetlb.1GB.usage_in_bytes\000", 27)); res = syscall(__NR_openat, /*fd=*/(intptr_t)-1, /*file=*/0x200000000180ul, /*flags=*/0x275a, /*mode=*/0); if (res != -1) r[0] = res; break; case 4: // mmap arguments: [ // addr: VMA[0xb36000] // len: len = 0xb36000 (4 bytes) // prot: mmap_prot = 0xa (8 bytes) // flags: mmap_flags = 0x28011 (8 bytes) // fd: fd (resource) // offset: intptr = 0x0 (8 bytes) // ] syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0xb36000, /*prot=PROT_SEM|PROT_WRITE*/ 0xaul, /*flags=MAP_STACK|MAP_POPULATE|MAP_FIXED|MAP_SHARED*/ 0x28011ul, /*fd=*/r[0], /*offset=*/0ul); break; case 5: // ioctl$XFS_IOC_FSBULKSTAT arguments: [ // fd: fd (resource) // cmd: const = 0xc0205865 (4 bytes) // arg: ptr[inout, xfs_fsop_bulkreq] { // xfs_fsop_bulkreq { // lastip: nil // icount: int32 = 0x6 (4 bytes) // pad = 0x0 (4 bytes) // ubuffer: nil // ocount: ptr[out, int32] { // int32 = 0x0 (4 bytes) // } // } // } // ] NONFAILING(*(uint64_t*)0x200000000400 = 0); NONFAILING(*(uint32_t*)0x200000000408 = 6); NONFAILING(*(uint64_t*)0x200000000410 = 0); NONFAILING(*(uint64_t*)0x200000000418 = 0x2000000003c0); syscall(__NR_ioctl, /*fd=*/(intptr_t)-1, /*cmd=*/0xc0205865, /*arg=*/0x200000000400ul); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000, /*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=*/0x1000, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; install_segv_handler(); use_temporary_dir(); loop(); return 0; }