// https://syzkaller.appspot.com/bug?id=c2fd07ae5213991a1b95eadee9205b41ac1aa6e2 // 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; //% 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 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) { 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"); } 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; } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); memcpy((void*)0x200000c0, "hfs\000", 4); memcpy((void*)0x200001c0, "\023\023w\305\3745\324\024T\325\324\035)\255\032`)" "Y\201F\346\276\026nA\255\r\275@T\003<\2373\273\332\202$" "\242\363\327r\347cnH\263<\277p\203r\350\361\271\223>" "\305\022wC\276\"\006 \236\360-\371\313\362\366\350\200\3238/\000", 78); memcpy((void*)0x20000040, "iocharset", 9); *(uint8_t*)0x20000049 = 0x3d; memcpy((void*)0x2000004a, "iso8859-9", 9); *(uint8_t*)0x20000053 = 0x2c; *(uint8_t*)0x20000054 = 0; memcpy( (void*)0x20000240, "\x78\x9c\xec\xdd\xb1\x6e\xd3\x40\x1c\xc7\xf1\xdf\x39\x69\x49\x69\x55\x4c" "\x5b\x84\xc4\x52\xa9\x80\x04\x0b\x6a\xcb\x82\x58\x8a\x50\x1e\x82\x09\x01" "\x4d\x90\x2a\xa2\x22\xa0\x48\xc0\x42\x41\x8c\x88\x07\x60\xe7\x15\x78\x08" "\x16\x10\x2f\x00\x13\x13\x0f\xd0\xcd\xe8\xce\x57\xc7\x4e\xed\x3a\x41\x38" "\x4e\xca\xf7\x23\x25\x3a\xdb\xf7\x3f\xff\x2f\xb6\xe3\xbb\x48\xad\x05\xe0" "\xbf\x75\xbb\xfd\xe3\xd3\xf5\x5f\xf6\x65\xa4\x86\x1a\x92\x6e\x4a\x81\xa4" "\x96\xd4\x94\x74\x4e\xe7\x5b\xcf\x77\xf7\x76\xf6\x7a\xdd\xce\x71\x0d\x35" "\x5c\x84\x7d\x19\xc5\x91\x26\xb3\xfd\x54\x71\x68\xeb\xb5\x8f\xf0\x42\xbb" "\xd4\xd4\x42\x7a\x1d\xaa\x11\x45\xd1\xad\x9f\x75\x27\x81\xda\xb9\xab\x3f" "\x47\xd0\x2f\xba\xed\xad\xf1\xa5\x54\xa9\x7d\x53\x77\x06\xe3\xb3\x9a\xb3" "\xce\x1c\xe8\x40\x2f\xb4\x58\x43\x3a\x00\x80\x09\xe2\xef\xff\x81\xbf\xcf" "\x2f\xf8\xf1\xfb\x9c\xdf\xdc\x3a\x69\xf7\xff\x83\xba\x13\xa8\x5c\xee\x70" "\x2e\x91\xba\xff\xbf\xb1\xcb\x91\xb1\x01\x67\xdc\xa6\xfe\x7c\xcf\x0d\x92" "\xec\x2c\x2c\x38\x9c\x25\x0e\xb3\xe7\x99\x81\xe5\x59\xc5\x67\x56\x26\x23" "\x53\x36\xab\x74\xb9\x04\x73\x0f\x77\x7a\xdd\x6b\xdb\x8f\x7b\x9d\x40\x6f" "\xb5\xe5\xa5\xaa\xad\xb8\xf7\x4e\x66\xa4\xaa\x92\x6c\xd7\x34\xd2\xe8\x6f" "\x88\xbe\x1b\x69\x3f\x67\xf5\xbc\xeb\xc3\x8c\xed\xc3\x66\x41\xfe\xcb\x49" "\x69\x75\xa4\x3d\xfe\x35\xf3\xc5\x7c\x33\x77\x4d\xa8\x8f\xea\x24\xe3\xbf" "\x66\x64\xec\x61\x72\x47\x2a\x1c\x38\x52\x71\xfe\xeb\xc5\x2d\xba\x5e\x86" "\xb6\x96\x6b\xdf\xb5\xb2\x15\x64\xaa\x9c\x75\x3b\xb9\xe0\xf7\xe0\x95\xf4" "\xb2\x55\x7c\x0a\xcf\xfa\x36\x33\x3f\x10\x84\x65\x79\xba\xa8\xa5\x81\xa8" "\xb8\x77\x1b\x25\x51\xcb\xb9\x51\x9b\x87\x4b\x05\x51\x2b\x99\x28\xdb\x9b" "\xe4\x6c\x2e\xde\x5f\xa5\x02\xc9\x7c\x30\x77\xcc\x9a\x7e\xeb\xb3\xda\xa9" "\xf1\x7f\x60\xf3\xbb\xac\x61\xae\x4c\x5b\xc7\xd5\xf4\x67\x46\xdc\x9f\xd9" "\xfc\x9a\x4d\x57\x33\x3c\x72\xe7\x38\x7a\xb9\x24\x9f\x62\xfc\x53\x51\x38" "\x6a\xdf\x30\x8a\xf7\x7a\xa0\x1b\x5a\x7c\xf6\xf2\xd5\xa3\x46\xaf\xd7\x7d" "\x6a\x0b\xf7\x73\x0a\x4f\x16\x92\x35\x33\xef\xa4\xdc\x3a\x35\x17\xb4\xdf" "\x5f\x13\x79\x13\x91\xd8\xd5\x7f\xda\xa0\xfd\xfe\x28\xad\x6c\xaf\xb2\x89" "\xe8\xfb\x34\x16\x9a\x25\x1f\x9d\x0e\x0b\xed\xaf\xd2\x84\xe4\x5c\x59\xa1" "\xee\x2f\x28\x8c\x43\xff\xa0\xd7\x9d\x09\x6a\x62\xc7\x5d\x26\x9e\xff\xa5" "\xe6\x2b\xeb\x6e\x8a\x64\xdf\xc2\x63\xc6\xe9\x51\x59\xe3\xa9\x16\x37\x92" "\x19\x50\x76\x28\xb8\xe4\xde\x4f\x8f\x34\x83\x9b\x2f\x9e\xc1\x0d\x3b\xe7" "\xba\x78\x45\xba\x34\xfc\x1e\x43\x9f\xe7\x09\x61\xda\xfa\xae\x7b\xfc\xfe" "\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x30\x6d\xc6" "\xf1\xe7\x04\x75\xf7\x11\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x80\x69\x57\xd5\xf3\x7f\xa3\xc1\xe7\xff\x5a\xdb\xbb\xdd" "\xbc\x50\xf7\xef\xc0\x79\xfe\x2f\x30\x76\x7f\x02\x00\x00\xff\xff\x7f\xe1" "\x7c\xca", 668); syz_mount_image(/*fs=*/0x200000c0, /*dir=*/0x200001c0, /*flags=*/0x3008093, /*opts=*/0x20000040, /*chdir=*/0x14, /*size=*/0x29c, /*img=*/0x20000240); return 0; }