// https://syzkaller.appspot.com/bug?id=1a910ddb4839b23b92697ddca297312045da4557 // 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, 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, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); memcpy((void*)0x2001f1c0, "ntfs\000", 5); memcpy((void*)0x2001f200, "./file0\000", 8); memcpy( (void*)0x20000b00, 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"\x3c\x01\xb6\x7f\xd9\x50\x7f\xd9\x50\x7f\xd9\x50\x7f\xd9\x50\x7f\xd9\x50" "\x7f\xd9\x50\x7f\xd9\xc4\xfd\xff\x39\xe5\xff\xcf\xe1\x4f\x91\xf5\xff\x39" "\xf5\x9e\x7b\x44\x39\xb1\xa4\x23\xf8\x7f\x27\x5a\x96\x95\xec\xff\x87\x7b" "\x7e\x2e\xc0\xff\x3a\x9d\xce\xfe\xfe\x5f\x9d\x37\x9f\x29\x60\x19\x35\xfc" "\x08\x4f\xb1\x85\x9a\xf6\xf7\x16\x90\x0d\xc7\x07\x30\xe3\xf1\xdd\xf5\xf7" "\xde\x23\xf6\xfe\x8f\x70\xea\x96\x36\x83\x65\x8c\x4d\xde\x52\xaf\x77\x4c" "\x2c\x24\x1d\x27\x60\xc7\x5f\x7f\xef\xee\xe7\x95\x36\x8e\x70\x9c\x80\x76" "\x20\x66\xcd\x55\x35\x03\xc1\xbd\x7e\x2f\xf2\xcf\x7b\x85\x3f\xa8\xfb\x63" "\x52\xb3\xdf\x33\x00\x65\x94\x63\xfb\xbf\x1a\xcf\x7c\xe1\x16\x6c\x52\x84" "\xf6\xb7\x43\xfa\xd9\xba\xbe\xcf\xd1\x8d\x17\xd0\x0e\xd4\xb7\xac\xb5\x1f" "\x8d\xd4\xb7\x11\x88\x37\x76\x45\x9f\xff\xba\x79\x1e\x62\xca\xb9\xa3\xfb" "\xa5\x5d\x53\xb4\x7e\x67\x63\x5d\xc5\x59\x81\xdf\xff\xb2\xa1\xfe\xb2\xa1" "\xfe\xb2\xa1\xfe\xb2\xa1\xfe\x12\xe9\xfe\x86\xa6\xfe\xb2\x89\xfb\xff\xf3" "\x7a\xfc\xff\xd3\x84\xf1\xff\xf3\x7d\x1c\xff\x1f\x0d\xad\x0b\xc8\x1c\xe2" "\xb9\x80\xb6\x7f\xcd\x88\xac\xff\x5f\x41\x03\xd3\xa8\xa2\x89\x9a\xf2\xba" "\xdf\x4c\x98\x97\x6f\x46\xf1\x27\x02\xf7\x2e\x7a\x2f\x5d\xae\x39\x1f\xab" "\xd4\xcc\xef\x47\xce\x9b\x3f\xe0\xe8\x38\x7c\x05\x94\xb1\x89\x47\xa8\xeb" "\xa3\x4c\xe7\xc7\xc8\xfa\xd7\x9f\xfc\xe4\x67\xff\xfa\x67\xf4\xba\xbb\x6d" "\xb5\x73\x02\x81\x6b\xd9\xfe\x65\x43\xfd\x65\x43\xfd\x65\x43\xfd\x65\x43" "\xfd\x65\x43\xfd\x65\x43\xfd\x65\x13\xf7\xff\x17\x74\xfc\xff\x1d\x3b\x1e" "\xff\xef\xc2\x29\xf9\xff\x94\xf1\x7f\xf4\x3c\xfe\x7f\x80\xe7\x02\xb8\xfe" "\xbf\x84\x8f\xd0\x42\x0d\x9b\x58\x53\xe3\xdf\x1f\x59\x66\xfc\xdb\xc6\x7d" "\x6b\xff\xb8\xfe\xb7\x2d\xef\x9f\xcb\x5b\xde\x15\x60\x55\x3f\x25\xe8\x82" "\xfe\xff\xa0\xf5\x7b\x47\x77\x0d\x0c\x65\x7e\x09\xe0\x21\x7e\x8c\xb2\x1f" "\xa3\xe0\xf8\xca\xb7\x31\x94\x29\xe0\x3d\x3c\x55\x71\x11\xaa\x00\xbe\xa6" "\xcb\x7f\xac\x9f\xed\x76\xd4\xfa\x0f\x67\x0a\x58\x42\x0d\x0d\x54\xb1\xa5" "\x7a\x58\xe2\x9f\x1b\x8e\xeb\xf7\x0b\x7e\xff\xcb\x86\xfa\xcb\x86\xfa\xcb" "\x86\xfa\xcb\x86\xfa\xcb\x86\xfa\xcb\x26\xee\xff\x47\x94\x77\xb7\x50\x4c" "\x88\xff\x3f\x72\x0a\xf1\xff\xc2\x71\xf9\xec\x9e\xe3\xf2\x7d\x62\xc5\xe3" "\xf2\xa9\x6d\x87\x79\x1e\xbf\x7f\x7e\xcb\xcf\x0d\xa6\x3f\x65\xfb\x97\x0d" "\xf5\x97\x0d\xf5\x97\x47\xe0\x69\xe8\x3d\x44\x88\x24\x03\xc0\xcd\xb4\x37" "\xd8\xfe\x65\x43\xfd\x65\x43\xfd\x65\x13\xf7\xff\x17\xf7\xf0\xff\x17\xe9" "\xff\x07\x0c\xb6\x7f\xd9\x50\x7f\xd9\x50\x7f\xd9\x50\x7f\xd9\x50\x7f\xd9" "\x50\x7f\xd9\x50\x7f\xd9\xc4\xfd\xff\xa5\x3d\xfc\xff\x25\xfa\xff\x01\x83" "\xed\x5f\x36\xd4\x5f\x36\xd4\x5f\x36\xd4\x5f\x30\x56\x52\x9c\x25\x22\x09" "\xb6\x7f\xd9\x50\x7f\xd9\xc4\xfd\xff\xe5\x3d\xfc\xff\x65\xfa\xff\x01\x83" "\xed\x5f\x36\xd4\x5f\x36\xd4\x5f\x36\xd4\x5f\x36\xd4\x5f\x36\xd4\x5f\x36" "\xd4\x5f\x36\x71\xff\x6f\x7c\xfc\x6f\x10\xf6\xff\x96\x7f\x44\x32\xc7\xe5" "\xff\x07\xd3\x67\xbf\xa9\xb0\xfd\xcb\x86\xfa\xcb\x86\xfa\xcb\x86\xfa\xcb" "\x86\xfa\xcb\x86\xfa\xcb\x86\xfa\xcb\x26\xee\xff\xc7\xe8\xff\x05\xc1\xf6" "\x2f\x1b\xea\x2f\x1b\xea\x2f\x1b\xea\x2f\x1b\xea\x2f\x1b\xea\x2f\x1b\xea" "\x2f\x9b\xb8\xff\x1f\xa7\xff\x17\x04\xdb\xbf\x6c\xa8\xbf\x6c\xa8\xbf\x6c" "\xa8\xbf\x6c\xa8\xbf\x6c\xa8\xbf\x6c\xa8\xbf\x6c\xe2\xfe\xff\x2b\xf4\xff" "\x82\x60\xfb\x97\x0d\xf5\x97\x0d\xf5\x97\x42\x2e\x71\x2b\xf5\x97\x0d\xf5" "\x97\x0d\xf5\x3f\x23\x7c\x19\x00\x00\xff\xff\x77\x14\x0f\xf8", 2445); syz_mount_image(0x2001f1c0, 0x2001f200, 0, 0x20000040, 1, 0x98d, 0x20000b00); return 0; }