// https://syzkaller.appspot.com/bug?id=055045c62299ac2d0ac4126b11a1c5afa8de5fc8 // 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 #include #include #include #include #ifndef __NR_memfd_create #define __NR_memfd_create 279 #endif #ifndef __NR_mkdirat #define __NR_mkdirat 34 #endif #ifndef __NR_mmap #define __NR_mmap 222 #endif #ifndef __NR_mount #define __NR_mount 40 #endif #ifndef __NR_symlinkat #define __NR_symlinkat 36 #endif 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 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; } #define MAX_FDS 30 //% 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; } static void setup_gadgetfs(); static void setup_binderfs(); static void setup_fusectl(); static void sandbox_common_mount_tmpfs(void) { write_file("/proc/sys/fs/mount-max", "100000"); if (mkdir("./syz-tmp", 0777)) exit(1); if (mount("", "./syz-tmp", "tmpfs", 0, NULL)) exit(1); if (mkdir("./syz-tmp/newroot", 0777)) exit(1); if (mkdir("./syz-tmp/newroot/dev", 0700)) exit(1); unsigned bind_mount_flags = MS_BIND | MS_REC | MS_PRIVATE; if (mount("/dev", "./syz-tmp/newroot/dev", NULL, bind_mount_flags, NULL)) exit(1); if (mkdir("./syz-tmp/newroot/proc", 0700)) exit(1); if (mount("syz-proc", "./syz-tmp/newroot/proc", "proc", 0, NULL)) exit(1); if (mkdir("./syz-tmp/newroot/selinux", 0700)) exit(1); const char* selinux_path = "./syz-tmp/newroot/selinux"; if (mount("/selinux", selinux_path, NULL, bind_mount_flags, NULL)) { if (errno != ENOENT) exit(1); if (mount("/sys/fs/selinux", selinux_path, NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); } if (mkdir("./syz-tmp/newroot/sys", 0700)) exit(1); if (mount("/sys", "./syz-tmp/newroot/sys", 0, bind_mount_flags, NULL)) exit(1); if (mount("/sys/kernel/debug", "./syz-tmp/newroot/sys/kernel/debug", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mount("/sys/fs/smackfs", "./syz-tmp/newroot/sys/fs/smackfs", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mount("/proc/sys/fs/binfmt_misc", "./syz-tmp/newroot/proc/sys/fs/binfmt_misc", NULL, bind_mount_flags, NULL) && errno != ENOENT) exit(1); if (mkdir("./syz-tmp/newroot/syz-inputs", 0700)) exit(1); if (mount("/syz-inputs", "./syz-tmp/newroot/syz-inputs", NULL, bind_mount_flags | MS_RDONLY, NULL) && errno != ENOENT) exit(1); if (mkdir("./syz-tmp/pivot", 0777)) exit(1); if (syscall(SYS_pivot_root, "./syz-tmp", "./syz-tmp/pivot")) { if (chdir("./syz-tmp")) exit(1); } else { if (chdir("/")) exit(1); if (umount2("./pivot", MNT_DETACH)) exit(1); } if (chroot("./newroot")) exit(1); if (chdir("/")) exit(1); setup_gadgetfs(); setup_binderfs(); setup_fusectl(); } static void setup_gadgetfs() { if (mkdir("/dev/gadgetfs", 0777)) { } if (mount("gadgetfs", "/dev/gadgetfs", "gadgetfs", 0, NULL)) { } } static void setup_fusectl() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void setup_binderfs() { if (mkdir("/dev/binderfs", 0777)) { } if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) { } if (symlink("/dev/binderfs", "./binderfs")) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); if (getppid() == 1) exit(1); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = (200 << 20); setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 32 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 128 << 20; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } typedef struct { const char* name; const char* value; } sysctl_t; static const sysctl_t sysctls[] = { {"/proc/sys/kernel/shmmax", "16777216"}, {"/proc/sys/kernel/shmall", "536870912"}, {"/proc/sys/kernel/shmmni", "1024"}, {"/proc/sys/kernel/msgmax", "8192"}, {"/proc/sys/kernel/msgmni", "1024"}, {"/proc/sys/kernel/msgmnb", "1024"}, {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, }; unsigned i; for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) write_file(sysctls[i].name, sysctls[i].value); } static int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static void drop_caps(void) { struct __user_cap_header_struct cap_hdr = {}; struct __user_cap_data_struct cap_data[2] = {}; cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; cap_hdr.pid = getpid(); if (syscall(SYS_capget, &cap_hdr, &cap_data)) exit(1); const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); cap_data[0].effective &= ~drop; cap_data[0].permitted &= ~drop; cap_data[0].inheritable &= ~drop; if (syscall(SYS_capset, &cap_hdr, &cap_data)) exit(1); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); sandbox_common(); drop_caps(); if (unshare(CLONE_NEWNET)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); sandbox_common_mount_tmpfs(); loop(); 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"); } static void close_fds() { for (int fd = 3; fd < MAX_FDS; fd++) close(fd); } 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 < 7; 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 || call == 1) break; event_timedwait(&th->done, 50 + (call == 6 ? 4000 : 0)); break; } } for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) sleep_ms(1); close_fds(); } 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 (;;) { 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; } } } void execute_call(int call) { switch (call) { case 0: // mkdirat arguments: [ // fd: fd_dir (resource) // path: nil // mode: open_mode = 0x0 (8 bytes) // ] syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0ul, /*mode=*/0ul); break; case 1: // mount arguments: [ // src: nil // dst: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // type: ptr[in, buffer] { // buffer: {72 61 6d 66 73 00} (length 0x6) // } // flags: mount_flags = 0x10 (8 bytes) // data: nil // ] memcpy((void*)0x200001c0, "./file0\000", 8); memcpy((void*)0x20000140, "ramfs\000", 6); syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x200001c0ul, /*type=*/0x20000140ul, /*flags=MS_SYNCHRONOUS*/ 0x10ul, /*data=*/0ul); break; case 2: // syz_mount_image$fuse arguments: [ // fs: ptr[in, buffer] { // buffer: {66 75 73 65 00} (length 0x5) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // flags: mount_flags = 0x400a8 (8 bytes) // opts: ptr[inout, array[ANYUNION]] { // array[ANYUNION] { // } // } // chdir: int8 = 0x1 (1 bytes) // size: const = 0x0 (8 bytes) // img: nil // ] // returns fd_dir memcpy((void*)0x20000000, "fuse\000", 5); memcpy((void*)0x20000040, "./file0\000", 8); syz_mount_image( /*fs=*/0x20000000, /*dir=*/0x20000040, /*flags=MS_PRIVATE|MS_REMOUNT|MS_NOEXEC|MS_DIRSYNC*/ 0x400a8, /*opts=*/0x20000180, /*chdir=*/1, /*size=*/0, /*img=*/0); break; case 3: // symlinkat arguments: [ // old: ptr[in, buffer] { // buffer: {2e 00} (length 0x2) // } // newfd: fd_dir (resource) // new: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // ] memcpy((void*)0x20000080, ".\000", 2); memcpy((void*)0x20000200, "./file0\000", 8); syscall(__NR_symlinkat, /*old=*/0x20000080ul, /*newfd=*/0xffffff9c, /*new=*/0x20000200ul); break; case 4: // mount$fuse arguments: [ // src: const = 0x0 (8 bytes) // dst: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // type: nil // flags: mount_flags = 0x104000 (8 bytes) // opts: nil // ] memcpy((void*)0x20000000, "./file0\000", 8); syscall(__NR_mount, /*src=*/0ul, /*dst=*/0x20000000ul, /*type=*/0ul, /*flags=MS_SHARED|MS_REC*/ 0x104000ul, /*opts=*/0ul); break; case 5: // mount$bind arguments: [ // src: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 2f 66 69 6c 65 30 00} (length 0xe) // } // dst: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 2f 66 69 6c 65 30 2f 2e 2e 2f 66 69 6c // 65 30 00} (length 0x17) // } // type: nil // flags: mount_flags = 0xa1c08 (8 bytes) // data: const = 0x0 (8 bytes) // ] memcpy((void*)0x20000480, "./file0/file0\000", 14); memcpy((void*)0x20000140, "./file0/file0/../file0\000", 23); syscall( __NR_mount, /*src=*/0x20000480ul, /*dst=*/0x20000140ul, /*type=*/0ul, /*flags=MS_SLAVE|MS_UNBINDABLE|MS_NOEXEC|MS_NODIRATIME|MS_NOATIME|0x1000*/ 0xa1c08ul, /*data=*/0ul); for (int i = 0; i < 64; i++) { syscall( __NR_mount, /*src=*/0x20000480ul, /*dst=*/0x20000140ul, /*type=*/0ul, /*flags=MS_SLAVE|MS_UNBINDABLE|MS_NOEXEC|MS_NODIRATIME|MS_NOATIME|0x1000*/ 0xa1c08ul, /*data=*/0ul); } break; case 6: // syz_mount_image$iso9660 arguments: [ // fs: ptr[in, buffer] { // buffer: {69 73 6f 39 36 36 30 00} (length 0x8) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // flags: mount_flags = 0x0 (8 bytes) // opts: ptr[inout, array[ANYUNION]] { // array[ANYUNION] { // union ANYUNION { // ANYBLOB: buffer: {6f 76 65 72 72 69 64 65 72 6f 63 6b 70 65 72 // 6d 2c 69 6f 63 68 61 72 73 65 74 3d 6d 61 63 63 72 6f 61 74 69 // 61 6e 2c 6e 6f 6a 6f 6c 69 65 74 2c 6e 6f 6a 6f 6c 69 65 74 2c // 6d 6f 64 65 3d 30 78 30 30 30 30 30 30 30 30 30 30 30 30 38 30 // 30 30 2c 67 69 64 3d} (length 0x55) // } // union ANYUNION { // ANYRESHEX: ANYRES64 (resource) // } // union ANYUNION { // ANYBLOB: buffer: {2c 64 6d 6f 64 65 3d 30 78 30 30 30 30 30 00 // 01 00 00 00 00 00 00 30 30 32 2c 75 6e 68 69 64 65 2c 00} // (length 0x22) // } // } // } // chdir: int8 = 0x1 (1 bytes) // size: len = 0x67f (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x67f) // } // ] // returns fd_dir memcpy((void*)0x20000040, "iso9660\000", 8); memcpy((void*)0x20000000, "./file0\000", 8); memcpy((void*)0x20000240, "overriderockperm,iocharset=maccroatian,nojoliet,nojoliet,mode=" "0x0000000000008000,gid=", 85); sprintf((char*)0x20000295, "0x%016llx", (long long)0); memcpy( (void*)0x200002a7, "\x2c\x64\x6d\x6f\x64\x65\x3d\x30\x78\x30\x30\x30\x30\x30\x00\x01\x00" "\x00\x00\x00\x00\x00\x30\x30\x32\x2c\x75\x6e\x68\x69\x64\x65\x2c\x00", 34); memcpy( (void*)0x20000740, "\x78\x9c\xec\xdd\xcf\x8f\x13\xe7\xf9\x00\xf0\xc7\x0b\xab\xf0\xdd\xaf" "\x14\x55\x6d\x15\x21\x44\xc8\x04\x5a\x09\x24\xb2\xd8\xde\xb0\x68\x95" "\x93\xeb\x9d\xdd\x9d\xc4\xf6\x58\x33\xde\x08\x4e\x29\x0a\x4b\x84\x58" "\x92\x16\x52\xa9\x70\x0a\x97\x54\x95\xda\x6b\xef\xb9\xf6\x8f\x68\xff" "\xa2\xa8\xd7\xf6\x94\xca\x33\x36\x98\xec\x0f\x53\x08\xbb\x08\x7d\x3e" "\x16\xbc\xaf\x67\x9e\x99\x79\xde\xc1\xcc\xa3\xd9\xf5\xcc\x04\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x10\x8d\xee\x7a\xb3" "\xd9\x6a\x44\x2f\x1b\x6c\x5f\x4f\x0e\xd6\x5d\x2f\xf2\xfe\x21\xf3\xa7" "\xeb\xfb\xe7\x33\xcd\x21\xdb\x8d\x68\x8c\xff\xc4\xa9\x53\x71\xba\x9e" "\x74\xfa\x97\x4f\x67\xbf\x33\xfe\xeb\x7c\x9c\xad\xdf\x9d\x8d\x53\xe3" "\xe6\x54\x3c\xfa\xff\x77\x7e\xf6\xd1\x2f\x4e\x2e\x4c\x97\x3f\x24\xa1" "\x23\xf1\xe0\xe1\xa3\xbb\x37\x77\x77\x77\xee\xef\x99\xf3\x9f\x13\xc7" "\x92\xd0\x11\xdb\x4c\x07\x59\x99\x67\xfd\xce\x66\x9a\x64\x65\x9e\xac" "\xad\xae\x36\xaf\x6c\x6d\x94\xc9\x46\xd6\x4b\xcb\x1b\xe5\x28\xed\x27" "\xdd\x22\xed\x8c\xf2\x22\xb9\xd8\xbd\x94\xb4\xd6\xd6\x56\x92\x74\xf9" "\x46\xbe\x3d\xd8\x5c\xef\xf4\xd2\xe9\xc4\x6b\x1f\xb4\x9b\xcd\xd5\xe4" "\xe3\xe5\x61\xda\x29\xca\x7c\x70\xe5\xe3\xe5\xb2\xbb\x95\xf5\x7a\xd9" 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"\xf7\x95\x43\x72\x7c\x12\xd4\x7a\x9e\xa0\xf6\x21\x41\xea\x3f\x2f\xef" "\xd5\x1c\xc8\xe1\x05\xfc\x30\xad\xff\x00\x00\x00\xc0\x1b\xab\x51\xfd" "\xf4\x7d\x7c\xfe\xbf\x18\xef\x56\xbd\x8d\xac\x97\x36\x8f\x3b\x2d\x00" "\x00\x00\xe0\x27\x54\xfd\xe6\xff\xec\xb8\x59\x1c\xf7\xde\x8d\x86\xf3" "\x7f\x00\x00\x00\x78\xd3\x34\xaa\x6b\xec\x1a\x11\xb1\x14\xef\xd5\xbd" "\xe9\x95\x50\x7e\x08\x00\x00\x00\x00\x6f\x88\xea\xf7\xff\xe7\xc6\xcd" "\xd2\xb8\xf7\x5e\x34\x9c\xff\x03\x00\x00\xc0\x9b\x66\xfd\xff\x26\x9d" "\x03\xef\xb1\x5f\x0e\xdf\x6a\xfc\xe3\x5f\x51\x14\x8b\x8d\xc7\xc3\xeb" "\xbf\x6a\xdc\xeb\x8c\xe3\x3a\xf7\x4e\xd4\xcb\x55\xcd\xbf\x7f\xa8\x8d" "\xfb\xa3\x8d\x33\x8d\xb7\x27\x2b\xa9\x9a\xd5\x93\x93\x77\xdd\xf4\x6c" "\x63\x72\xf7\xcb\x27\x37\xc1\x5c\xac\x9b\xef\x6f\xcf\xbb\xd7\x7f\xe3" "\xd0\x04\x66\x1d\x9c\x40\xfc\x25\xde\xaf\x63\xde\xbf\x55\xb7\xb7\xa6" "\x73\xea\xad\x2c\x6d\x64\xbd\x74\xb9\x9b\xf7\x3e\x6a\x45\xa7\xf3\xf6" "\xc2\x28\xbd\x3e\xfa\xc3\x97\x77\xfe\x18\xd5\xf0\xff\x3c\xe8\xbf\xdd" "\x88\xdb\x77\x76\x77\x96\x3f\xff\x6a\xf7\x56\x95\xcb\xe3\xf1\x5a\x1e" "\xdf\x9b\xdc\x40\x71\xcf\x7d\x14\xf7\xc9\x65\x3a\xeb\xeb\xea\x7e\x0b" "\xd5\x35\x17\xfb\x8e\x78\xb1\xba\x10\x63\xb2\xdd\xa5\x7a\xbb\xcd\xd9" "\xf1\x2f\xd4\x8b\x2f\xfc\x0f\xe3\xff\x36\xce\xd7\x31\xe7\x97\xea\x76" "\xe9\xd9\xf1\x9f\x1a\x6f\xb3\xb5\x7c\xd0\xe8\x27\x59\xb4\x5e\x70\xe4" "\x4f\xb3\xb8\x50\xc7\x5c\xb8\x78\xa1\x6e\xf6\xc9\xa2\x3d\x2f\x8b\xf6" "\x6c\x16\x2f\xb4\x2f\x9e\x23\x8b\x95\x79\x59\xac\xbc\x64\x16\x00\xc7" "\xe5\xf6\x9c\x2a\xd4\xd8\x5b\xf8\x5f\xe0\x28\x77\x34\xd5\xfd\xdb\xb8" "\x58\xc7\x5c\x3c\x53\x1d\x58\x4f\x9e\xd9\xe7\x88\xde\x9c\x77\x44\x6f" "\xbe\x64\x75\xfb\x7b\x5c\xaa\x63\x2e\x4d\x83\x0f\xaa\xb1\xe3\xed\xfe" "\xf5\x47\x55\xf5\xbb\xf1\x02\xdf\x1d\xb8\xdd\xb2\xd7\x6e\x8c\x77\xe1" "\x89\xaf\xef\xfd\x2e\xde\x79\xf0\xf0\xd1\x07\x77\xee\xdd\xfc\x62\xe7" "\x8b\x9d\x2f\xdb\xed\x95\xd5\xe6\x87\xcd\xe6\xd5\x76\x2c\x56\xc3\x98" "\x34\x6a\x0f\x00\xfb\x38\xec\x19\x3b\x75\xfd\x9f\x1b\xd1\xf8\x70\xce" "\x59\xf5\xcf\x9f\x7c\xa5\x60\x39\x3e\x8f\xaf\x62\x37\x6e\xc5\xe5\xea" "\x6a\x83\xea\x1b\x07\xfb\xae\x75\x69\xe6\x6b\x08\x97\xe7\x9c\xb5\x2e" "\xcd\x3c\xe1\xe5\xf2\x9c\xb3\xba\xa5\x99\x07\xbd\x3c\x7f\xec\xca\x11" "\xfc\x4b\x00\xc0\xd1\x39\x3f\xa7\x0e\x3f\x4f\xfd\xbf\x3c\xe7\xbc\xfb" "\xd9\x5a\x7e\xf8\xd9\xf1\x6c\x2d\x07\x00\x5e\x8d\xb4\xf8\xbe\xb1\x34" "\xfa\x53\xa3\x28\xb2\xe1\x67\xad\xb5\xb5\x56\x67\xb4\x95\x26\x45\xde" "\xfd\x24\x29\xb2\xf5\xcd\x34\xc9\x06\xa3\xb4\xe8\x6e\x75\x06\x9b\x69" "\x32\x2c\xf2\x51\xde\xcd\x7b\xe3\xce\xa7\xd9\x7a\x5a\x26\xe5\xf6\x70" "\x98\x17\xa3\x64\x23\x2f\x92\x61\x5e\x66\xd7\xab\x27\xbf\x27\x93\x47" "\xbf\x97\x69\xbf\x33\x18\x65\xdd\x72\xd8\x4b\x3b\x65\x9a\x74\xf3\xc1" "\xa8\xd3\x1d\x25\xeb\x59\xd9\x4d\x86\xdb\xbf\xe9\x65\xe5\x56\x5a\x54" "\x0b\x97\xc3\xb4\x9b\x6d\x64\xdd\xce\x28\xcb\x07\x49\x99\x6f\x17\xdd" "\x74\x39\x49\xca\x34\x9d\x09\xcc\xd6\xd3\xc1\x28\xdb\xc8\xc6\xdd\x41" "\x32\x2c\xb2\x7e\xa7\xb8\x91\x7c\x9a\xf7\xb6\xfb\x69\xb2\x9e\x96\xdd" "\x22\x1b\x8e\xf2\x7a\x85\xd3\x6d\x65\x83\x8d\xbc\xe8\x57\xab\x5d\x3e" "\xee\x9d\x0d\x00\xaf\x89\x07\x0f\x1f\xdd\xbd\xb9\xbb\xbb\x73\xff\x15" "\x76\xe2\xad\xe3\x1e\x25\x00\x30\x6b\xa6\x4a\x03\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\xaf\xa9\xa3\xb8\xfe\xef\x0d\xec\xfc\xfe\xd9" "\x5d\x77\x22\x5e\x97\xc4\x74\x0e\xec\x2c\xbc\x1e\x69\x1c\x77\xe7\x9b" "\xdf\xd6\xff\xf3\xe7\x05\x1f\xf7\x91\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\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\xf6\xfa\x6f\x00\x00\x00\xff\xff\xa8\xda\x5a\x7c", 1663); syz_mount_image(/*fs=*/0x20000040, /*dir=*/0x20000000, /*flags=*/0, /*opts=*/0x20000240, /*chdir=*/1, /*size=*/0x67f, /*img=*/0x20000740); break; } } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*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=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; do_sandbox_none(); return 0; }