// https://syzkaller.appspot.com/bug?id=10041bc35eb21943495c4336d5de089c115b135e // 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; } static long syz_open_procfs(volatile long a0, volatile long a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == -1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } //% 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) { errno = EMSGSIZE; return -1; } 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, 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 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, loopfd = -1, 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) { memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(data, size, loopname, &loopfd) == -1) return -1; source = loopname; } mkdir(target, 0777); char opts[256]; memset(opts, 0, sizeof(opts)); if (strlen(mount_opts) > (sizeof(opts) - 32)) { } strncpy(opts, mount_opts, sizeof(opts) - 32); if (strcmp(fs, "iso9660") == 0) { flags |= MS_RDONLY; } else if (strncmp(fs, "ext", 3) == 0) { if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } res = mount(source, target, fs, flags, opts); if (res == -1) { err = errno; goto error_clear_loop; } res = open(target, O_RDONLY | O_DIRECTORY); if (res == -1) { err = errno; goto error_clear_loop; } if (change_dir) { res = chdir(target); if (res == -1) { err = errno; } } error_clear_loop: if (need_loop_device) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } 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; retry: while (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW) == 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, MNT_DETACH | UMOUNT_NOFOLLOW) == 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, MNT_DETACH | UMOUNT_NOFOLLOW)) 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, MNT_DETACH | UMOUNT_NOFOLLOW)) 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")) { } } static void setup_sysctl() { char mypid[32]; snprintf(mypid, sizeof(mypid), "%d", getpid()); struct { const char* name; const char* data; } files[] = { {"/sys/kernel/debug/x86/nmi_longest_ns", "10000000000"}, {"/proc/sys/kernel/hung_task_check_interval_secs", "20"}, {"/proc/sys/net/core/bpf_jit_kallsyms", "1"}, {"/proc/sys/net/core/bpf_jit_harden", "0"}, {"/proc/sys/kernel/kptr_restrict", "0"}, {"/proc/sys/kernel/softlockup_all_cpu_backtrace", "1"}, {"/proc/sys/fs/mount-max", "100"}, {"/proc/sys/vm/oom_dump_tasks", "0"}, {"/proc/sys/debug/exception-trace", "0"}, {"/proc/sys/kernel/printk", "7 4 1 3"}, {"/proc/sys/kernel/keys/gc_delay", "1"}, {"/proc/sys/vm/oom_kill_allocating_task", "1"}, {"/proc/sys/kernel/ctrl-alt-del", "0"}, {"/proc/sys/kernel/cad_pid", mypid}, }; for (size_t i = 0; i < sizeof(files) / sizeof(files[0]); i++) { if (!write_file(files[i].name, files[i].data)) printf("write to %s failed: %s\n", files[i].name, strerror(errno)); } } 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) { int i, call, thread; for (call = 0; call < 16; 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 == 3 || call == 9) break; event_timedwait(&th->done, 50 + (call == 15 ? 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 (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } remove_dir(cwdbuf); } } uint64_t r[5] = {0x0, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_call(int call) { intptr_t res = 0; switch (call) { case 0: syscall(__NR_signalfd4, -1, 0ul, 0ul, 0ul); break; case 1: NONFAILING(*(uint64_t*)0x20000140 = 9); NONFAILING(*(uint64_t*)0x20000148 = 0x100000000000008b); syscall(__NR_prlimit64, 0, 0xeul, 0x20000140ul, 0ul); break; case 2: res = syscall(__NR_getpid); if (res != -1) r[0] = res; break; case 3: syscall(__NR_sched_setscheduler, r[0], 2ul, 0ul); break; case 4: NONFAILING(*(uint32_t*)0x20000080 = 2); syscall(__NR_sched_setscheduler, 0, 2ul, 0x20000080ul); break; case 5: NONFAILING(memcpy((void*)0x20000180, "net/mcfilter6\000", 14)); NONFAILING(syz_open_procfs(0, 0x20000180)); break; case 6: res = syscall(__NR_pipe, 0x20000040ul); if (res != -1) { NONFAILING(r[1] = *(uint32_t*)0x20000040); NONFAILING(r[2] = *(uint32_t*)0x20000044); } break; case 7: NONFAILING(memcpy((void*)0x20000100, "memory.events\000", 14)); syscall(__NR_openat, 0xffffff9c, 0x20000100ul, 0x26e1ul, 0ul); break; case 8: NONFAILING(memcpy((void*)0x20000140, "memory.events\000", 14)); res = syscall(__NR_openat, 0xffffff9c, 0x20000140ul, 0x7a05ul, 0x1700ul); if (res != -1) r[3] = res; break; case 9: syscall(__NR_read, -1, 0ul, 0ul); break; case 10: syscall(__NR_splice, r[1], 0ul, r[3], 0ul, 0x100000800ff04ul, 0ul); break; case 11: NONFAILING(memcpy((void*)0x20000080, "./bus\000", 6)); res = syscall(__NR_open, 0x20000080ul, 0x1c1d42ul, 0ul); if (res != -1) r[4] = res; break; case 12: syscall(__NR_mmap, 0x20001000ul, 0xa000ul, 0xf3073df37a95d2aul, 0x11ul, r[4], 0ul); break; case 13: NONFAILING(*(uint64_t*)0x20000240 = 0x200001c0); NONFAILING(memset((void*)0x200001c0, 162, 1)); NONFAILING(*(uint64_t*)0x20000248 = 1); syscall(__NR_writev, r[4], 0x20000240ul, 1ul); break; case 14: syscall(__NR_write, r[2], 0x20000240ul, 0xfffffc8ful); { int i; for (i = 0; i < 64; i++) { syscall(__NR_write, r[2], 0x20000240ul, 0xfffffc8ful); } } break; case 15: NONFAILING(memcpy((void*)0x20000280, "vfat\000", 5)); NONFAILING(memcpy((void*)0x20000100, "./bus\000", 6)); NONFAILING(memcpy((void*)0x20000500, "iocharset", 9)); NONFAILING(*(uint8_t*)0x20000509 = 0x3d); NONFAILING(memcpy((void*)0x2000050a, "cp857", 5)); NONFAILING(*(uint8_t*)0x2000050f = 0x2c); NONFAILING(memcpy((void*)0x20000510, "shortname=win95", 15)); NONFAILING(*(uint8_t*)0x2000051f = 0x2c); NONFAILING(memcpy((void*)0x20000520, "shortname=mixed", 15)); NONFAILING(*(uint8_t*)0x2000052f = 0x2c); NONFAILING(memcpy((void*)0x20000530, "uni_xlate=0", 11)); NONFAILING(*(uint8_t*)0x2000053b = 0x2c); NONFAILING(memcpy((void*)0x2000053c, "shortname=winnt", 15)); NONFAILING(*(uint8_t*)0x2000054b = 0x2c); NONFAILING(memcpy((void*)0x2000054c, "utf8=1", 6)); NONFAILING(*(uint8_t*)0x20000552 = 0x2c); NONFAILING(memcpy((void*)0x20000553, "check=normal", 12)); NONFAILING(*(uint8_t*)0x2000055f = 0x2c); NONFAILING(memcpy((void*)0x20000560, "uni_xlate=0", 11)); NONFAILING(*(uint8_t*)0x2000056b = 0x2c); NONFAILING(memcpy((void*)0x2000056c, "shortname=lower", 15)); NONFAILING(*(uint8_t*)0x2000057b = 0x2c); NONFAILING(memcpy((void*)0x2000057c, "tz=UTC", 6)); NONFAILING(*(uint8_t*)0x20000582 = 0x2c); NONFAILING(memcpy((void*)0x20000583, "debug", 5)); NONFAILING(*(uint8_t*)0x20000588 = 0x2c); NONFAILING(memcpy((void*)0x20000589, "shortname=mixed", 15)); NONFAILING(*(uint8_t*)0x20000598 = 0x2c); NONFAILING(memcpy((void*)0x20000599, "shortname=win95", 15)); NONFAILING(*(uint8_t*)0x200005a8 = 0x2c); NONFAILING(memcpy((void*)0x200005a9, "nonumtail=0", 11)); NONFAILING(*(uint8_t*)0x200005b4 = 0x2c); NONFAILING(memcpy((void*)0x200005b5, "rodir", 5)); NONFAILING(*(uint8_t*)0x200005ba = 0x2c); NONFAILING(memcpy((void*)0x200005bb, "uni_xlate=1", 11)); NONFAILING(*(uint8_t*)0x200005c6 = 0x2c); NONFAILING(memcpy((void*)0x200005c7, "iocharset", 9)); NONFAILING(*(uint8_t*)0x200005d0 = 0x3d); NONFAILING(memcpy((void*)0x200005d1, "ascii", 5)); NONFAILING(*(uint8_t*)0x200005d6 = 0x2c); NONFAILING(memcpy((void*)0x200005d7, "uni_xlate=0", 11)); NONFAILING(*(uint8_t*)0x200005e2 = 0x2c); NONFAILING(memcpy((void*)0x200005e3, "shortname=winnt", 15)); NONFAILING(*(uint8_t*)0x200005f2 = 0x2c); NONFAILING(memcpy((void*)0x200005f3, "obj_user", 8)); NONFAILING(*(uint8_t*)0x200005fb = 0x3d); NONFAILING( memcpy((void*)0x200005fc, "F{$7!,\0206\260\020\004s%\307J\322L\327\337s{" "3\250\020y0\264\212\321n\001\210\302\355\213#\243A\301\3028pR " "\035\002_ " "\227\'Q\036X\tU\375\005\026\233RIb\301\234\226a\365\273V\344" "\373P\024[rr\221#dr\211*\214\036\023\035V\a@.=" "f\222\206X\306\003\334X\000\000\224\004\210P\001\231\325M\020" "\306\224<\307\242\022;\337\363/" "\216\313\371\322\347\312\331@\t\353w\275\314\245}" "\252e\312\247\332eq\030\222\244\264*w\245\254\224Pb\342?7\033." "7\307\021\353\035*\317U\00500\315\373\200y\215\212\323A}" "G\2040i\237\226\"\314\326\375\320\202\233g\261b\026\237\234\371" "\345\341\255}\023.\325\272>\250\203<" "l\037\353\225\216G\311je\005\357\177\244\231\'\260\335\0273\312" "\351S\3467]\377\177\312\002R\211\232N(S%\310\365\344U\256!{" "\260\324T\335\225:\037\036$" "\210R\277\361\361\305P\256\216\2036\034P\215W\341\227\2360\262" "\314\030\356\262o\320\276b", 290)); NONFAILING(*(uint8_t*)0x2000071e = 0x2c); NONFAILING(memcpy((void*)0x2000071f, "smackfshat", 10)); NONFAILING(*(uint8_t*)0x20000729 = 0x3d); NONFAILING(memcpy((void*)0x2000072a, "rodir", 5)); NONFAILING(*(uint8_t*)0x2000072f = 0x2c); NONFAILING(memcpy((void*)0x20000730, "appraise_type=imasig", 20)); NONFAILING(*(uint8_t*)0x20000744 = 0x2c); NONFAILING(memcpy((void*)0x20000745, "fscontext", 9)); NONFAILING(*(uint8_t*)0x2000074e = 0x3d); NONFAILING(memcpy((void*)0x2000074f, "unconfined_u", 12)); NONFAILING(*(uint8_t*)0x2000075b = 0x2c); NONFAILING(*(uint8_t*)0x2000075c = 0); NONFAILING(memcpy( (void*)0x200002c0, "\x78\x9c\xec\xdd\xbf\x6b\x93\x5d\x14\x07\xf0\xd3\x1f\xef\x6b\x75\x49" "\x11\xa1\x20\x0e\x0f\xb8\x38\x85\x36\xd0\x3d\x45\x2a\x88\x01\xa5\x25" "\x48\x45\xc4\x68\x53\x28\x4d\x28\x58\x08\x28\xd8\x76\x13\x1c\xdc\x1c" "\x1d\xdd\x44\xc1\xc5\xcd\x3f\x42\xd0\x55\x74\x10\x47\x8b\x4b\x87\x42" "\xc4\x3c\x25\x69\x4a\xd4\x5a\x48\x13\x9b\xcf\x67\xc9\x21\xf7\x7c\xc9" "\xc9\x92\x4b\x86\xe7\xde\xdb\xe7\xaa\x2b\x8b\xab\x6b\x4b\x5b\x5b\x5f" "\x62\x6c\x6c\x28\x46\xf3\x91\x8f\xed\xa1\x18\x8f\xe1\x18\x89\xd4\x66" "\x44\x8c\x06\x00\x70\x5c\x6c\xd7\xeb\xf1\xad\x9e\xea\xf5\x2c\x00\xc0" "\xd1\xb0\xff\x03\xc0\xe0\x39\xe0\xfe\x7f\xed\x08\x47\x02\x00\xba\xec" "\xf0\xff\xff\x9f\x2e\xbc\xfd\x58\x2a\xe7\xa7\xbb\x35\x19\x00\xd0\x2d" "\xf3\x0b\x37\xae\xcc\x14\x0a\x27\xe7\x92\x64\x2c\xa2\xfa\xa8\x56\xac" "\x15\xd3\xd7\x74\x7d\x66\x29\x96\xa3\x12\xe5\x98\x8c\x4c\xec\x44\xd4" "\x9b\xd2\xfa\xd2\xe5\xc2\xec\x64\xd2\x30\x1e\xc5\xea\xc6\x6e\x7e\xa3" "\x56\x1c\x69\xcf\x4f\x45\x26\xc6\x3b\xe7\xa7\xd2\x7c\xd2\x9e\xff\x2f" "\x4e\xed\xcd\xe7\x22\x13\x67\x3a\xe7\x73\xad\xfc\xd0\x66\xc4\x6e\xfe" "\xff\xb8\x70\x7e\x4f\x3e\x1b\x99\x78\x77\x37\x56\xa3\x12\x8b\xf1\x33" "\xdb\xca\xaf\x4f\x25\xc9\xc5\xab\x85\x7d\x9f\x7f\xa2\xd1\x07\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xdd\x90" "\x4d\x9a\x3a\x9e\xdf\x93\xcd\xfe\x6a\x3d\xcd\xff\xc5\xf9\x40\xcd\xf3" "\x75\x1e\x37\xf2\xa3\x71\xd6\xa5\x82\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\xd0\xb0\x76\xff\xc1\x4a\xa9\x52\x29\xdf" "\x6b\x16\x77\xe6\x96\x4f\xb7\xbf\x73\x8c\x8b\x9d\xd9\x27\x2f\xfb\x60" "\x8c\x7f\xaf\x78\xfd\xa2\xfc\xfe\xf9\xad\x9b\xf3\x07\x6a\xfe\xfe\xa1" "\x2f\x66\x3e\x7c\x71\xfd\xe1\x6f\x7a\x5e\xf5\xc3\x84\x7f\x2e\x26\x9e" "\xe5\x4b\x6f\xd6\x3f\x7d\xed\xd4\x33\x1c\x11\xfb\x53\xbd\xfe\x65\x02" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\xc1\xd3\x7a" "\xe8\xb7\xd7\x93\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x40\xef\xb4\xee\xff\xef\x5a\xf1\x79\x7a\x22\xd7\xeb\xaf\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\xc0" "\x80\xfb\x11\x00\x00\xff\xff\xf6\x24\xb1\x03", 538)); NONFAILING(syz_mount_image(0x20000280, 0x20000100, 0x840, 0x20000500, -1, 0x21a, 0x200002c0)); break; } } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); setup_sysctl(); install_segv_handler(); use_temporary_dir(); loop(); return 0; }