// https://syzkaller.appspot.com/bug?id=6758d3786f40908bb815a82ba215411fc121f807 // 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 #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; \ }) //% 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; } uint64_t r[1] = {0xffffffffffffffff}; 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); install_segv_handler(); intptr_t res = 0; NONFAILING(memcpy((void*)0x20000000, "hfs\000", 4)); NONFAILING(memcpy((void*)0x20000280, "./bus\000", 6)); NONFAILING(memcpy((void*)0x200000c0, "iocharset", 9)); NONFAILING(*(uint8_t*)0x200000c9 = 0x3d); NONFAILING(memcpy((void*)0x200000ca, "macturkish", 10)); NONFAILING(*(uint8_t*)0x200000d4 = 0x2c); NONFAILING(memcpy((void*)0x200000d5, "creator", 7)); NONFAILING(*(uint8_t*)0x200000dc = 0x3d); NONFAILING(memcpy((void*)0x200000dd, "\x6e\x12\x35\x1b", 4)); NONFAILING(*(uint8_t*)0x200000e1 = 0x2c); NONFAILING(*(uint8_t*)0x200000e2 = 0); NONFAILING(memcpy( (void*)0x200002c0, "\x78\x9c\xec\xdd\x4f\x6b\x13\x41\x18\xc7\xf1\xdf\x4c\xd2\x36\xda\x52\xb7" "\x7f\xa4\xe0\xb1\x5a\xf0\x24\x6d\xbd\x88\x17\x41\xfa\x22\x3c\x88\xa8\x4d" "\x84\x62\xa8\xa0\x15\xd4\x93\x78\x16\xf1\x26\x78\xf7\xe6\x59\x7c\x0d\x9e" "\xc4\x37\xa0\x27\x4f\xbe\x80\xdc\x56\x66\x76\xd2\x6c\x63\x76\xb3\x89\x24" "\xd3\x3f\xdf\x0f\x24\x6c\x9b\x79\x76\x9e\xa7\x3b\xe9\xce\x13\x28\x15\x80" "\x33\xeb\xf6\xce\xcf\x4f\xd7\x7f\xbb\x87\x91\x6a\xaa\x49\xba\x29\x59\x49" "\x0d\xa9\x2e\xe9\xa2\xd6\x1a\xcf\xf7\x0f\xf6\x0e\xda\xad\x66\xd9\x89\x6a" "\x3e\xc2\x3d\x8c\xb2\x48\xf3\xcf\x98\xdd\xfd\xd6\xa0\x50\x17\xe7\x23\x82" "\xc4\x7d\x55\xd7\x42\xfe\x7b\x98\x8c\x34\x4d\xd3\x5f\xb1\x93\x40\x74\xfe" "\xdd\x3f\x80\x95\xe6\xc2\xbb\xd3\xbf\xde\x98\x7a\x66\x93\xf1\x3a\x76\x02" "\x91\x99\x8e\x3a\x7a\xa1\xc5\xd8\x79\x00\x00\xe2\x0a\xf7\x7f\x1b\xee\xf3" "\x0b\x61\xff\x6e\xad\xb4\x11\x6e\xfb\xa7\xea\xfe\xdf\x89\x9d\x40\x64\xb9" "\xfb\xbf\xef\xb2\x52\xe3\xae\xef\x05\xff\x52\xaf\xdf\xf3\x2d\x9c\x7b\xdd" "\x76\xbb\xc4\x71\xe6\x9a\x55\xb6\xb2\x8e\x6c\x30\xcd\xb0\xae\xd2\xe7\x62" "\xcf\x3d\xda\x6b\xb7\xae\xed\x3e\x69\x37\xad\xde\xe8\x56\x90\x1b\xb6\xea" "\x9f\x9b\xd9\xd2\xed\x1a\x92\xed\xfa\x80\xde\xb4\xc4\xf8\xb5\xcf\xfb\x1a" "\x66\x5c\x0d\xdb\x05\xf9\xaf\x8c\x33\xe3\x87\xd1\x53\x39\x64\xbe\x99\xef" "\xe6\x9e\x49\xf4\x51\xcd\xc3\xfd\x5f\x3d\x35\xee\x32\xf9\x2b\x95\xf4\x5d" "\xa9\x2c\xff\xcd\xe2\x33\xfa\x2a\x93\x6c\x54\x41\x95\x4b\x7e\x92\x4b\x61" "\x06\x7d\xfd\x5c\xa1\xca\xc6\xe0\x8e\x44\xdd\x15\xb5\xa4\xa3\x1f\x10\x24" "\xdd\x3c\xdf\xcf\x96\x44\x2d\xf7\x45\x65\xd5\x6d\x15\x57\xe7\xa3\x56\x06" "\x46\x6d\x0f\x89\x5a\xed\x8f\xea\xad\xe6\xe2\xc8\x49\x33\xef\xcc\x1d\xb3" "\xae\x3f\xfa\xa2\x9d\xdc\xfe\xdf\xba\x9f\xf6\x86\xaa\xbc\x33\xdd\x18\x3f" "\x32\xac\x8c\xd2\x7a\xea\x7e\x64\x52\x21\x31\x3b\x52\x19\xf8\x3f\x6f\xf5" "\x50\x37\xb4\xf8\xec\xe5\xab\xc7\x0f\xda\xed\xd6\x53\x0e\x8e\xf1\x41\x5d" "\xd3\x98\x6b\x26\x2c\x8d\x63\x51\x32\x07\xe5\x07\x35\xcd\x69\xa2\x53\x44" "\xfe\xfd\x84\xa9\xe8\x5d\x74\xad\xdd\x8d\x9d\x0c\x62\x70\xfb\x2e\x93\xf5" "\x7f\xb9\x7e\x65\xd3\xb7\x48\xee\x29\x29\xd9\xa7\xa7\xc3\x4e\x9e\x3b\xe3" "\x56\x41\x6f\xb0\xec\x9f\xcf\x8f\xd4\xc1\xcd\x17\x77\x70\x55\x7b\xae\xcb" "\x57\xa5\x2b\xd5\x67\x4c\x42\x9e\xa7\x84\xd9\xd1\x0f\xdd\xe7\xf3\x7f\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x93\x66\x1a\x7f" "\xb1\x10\xbb\x46\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x4e\x3a\xfe\xff\x2f\x70\x76\xfd\x0d\x00\x00\xff\xff\xe9\x0e" "\x7f\x0a", 596)); NONFAILING(syz_mount_image(0x20000000, 0x20000280, 0x1000408, 0x200000c0, 3, 0x254, 0x200002c0)); NONFAILING(memcpy((void*)0x20000080, "blkio.bfq.sectors_recursive\000", 28)); res = syscall(__NR_openat, 0xffffff9c, 0x20000080ul, 0x275aul, 0ul); if (res != -1) r[0] = res; syscall(__NR_write, r[0], 0x20000100ul, 0x208e24bul); syscall(__NR_mmap, 0x20000000ul, 0xb36000ul, 0x800001ul, 0x28011ul, r[0], 0ul); NONFAILING( memcpy((void*)0x20000300, "blkio.bfq.io_merged_recursive\000", 30)); syscall(__NR_openat, 0xffffff9c, 0x20000300ul, 0x275aul, 0ul); return 0; }