// https://syzkaller.appspot.com/bug?id=226f9086d780dcf4cd884f40aeb6b56825e0e244 // 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, /*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*)0x20000440, "ext4\000", 5); memcpy((void*)0x20000000, "./file0\000", 8); *(uint8_t*)0x20000080 = 0; memcpy( (void*)0x20000900, "\x78\x9c\xec\xdc\xcf\x6b\x1c\x55\x1c\x00\xf0\xef\x4c\xb2\xad\xf6\x57\x62" "\xad\x3f\x5a\xab\x46\xab\x58\xfc\x91\x34\x69\xd5\x1e\x04\x7f\x80\xe0\xa1" "\x82\xa0\x87\x7a\x8c\x69\x5a\x6a\xb7\x8d\x34\x11\x6c\x09\x36\x4a\xa9\x17" "\x41\x0b\xde\x45\xf0\x22\xf8\x17\x78\xf2\x24\xea\x49\xf0\xaa\x77\x29\x14" "\xe9\xa5\xd5\x83\xac\xcc\xee\xcc\xba\xd9\x6c\x7e\x6c\xb2\xc9\x36\xee\xe7" "\x03\xd3\x9d\xb7\xfb\x36\xef\x7d\x67\xe6\xcd\xbc\x79\xaf\xb3\x01\xf4\xac" "\xa1\xec\x9f\x24\x62\x47\x44\xfc\x16\x11\x03\x11\x91\x36\x67\x18\xaa\xbd" "\xdc\xba\x31\x3b\xf1\xd7\x8d\xd9\x89\x24\x2a\x95\x37\xff\x4c\xb2\xaf\xc5" "\xcd\x1b\xb3\x13\x45\xd6\x24\x7f\xdd\x5e\x4b\xf4\x67\x2f\xe9\xe5\x24\x5e" "\x6a\x51\xee\xf4\x85\x8b\x67\xc6\xcb\xe5\xc9\xf3\x79\x7a\x64\xe6\xec\x7b" "\x23\xd3\x17\x2e\x3e\x73\xfa\xec\xf8\xa9\xc9\x53\x93\xe7\xc6\x8e\x1e\x3d" "\x72\x78\xf4\xf9\xe7\xc6\x9e\xed\x48\x9c\x59\x9d\x6e\xee\xfb\x70\x6a\xff" "\xde\xd7\xde\xbe\xfa\xfa\xc4\xf1\xab\xef\xfc\xf4\x6d\xd2\x50\xe9\xc6\x38" "\x3a\xa3\x14\x73\x0d\xdb\xa4\xd9\xe3\x9d\x2d\xac\xeb\x76\x36\xac\x27\xfd" "\x5d\xac\x08\x6d\xd9\x1a\x51\x6d\xa8\xa5\x6a\xfb\x1f\x88\xbe\xcb\xbb\xea" "\x9f\x0d\xc4\xab\x1f\x77\xb5\x72\xc0\xba\xaa\x54\x2a\x95\xb1\xc5\x3f\x9e" "\xab\x00\xff\x63\x49\x74\xbb\x06\x40\x77\x14\x17\xfa\xec\xfe\xb7\x58\x36" "\xa8\xeb\x71\x5b\xb8\xfe\x72\xed\x06\x28\x8b\xfb\x56\xbe\xd4\x3e\xe9\xaf" "\x8f\x83\x94\x9a\xee\x6f\x3b\x69\x36\x22\x8e\xcf\xfd\xfd\x65\xb6\xc4\xba" "\x8c\x43\x00\x00\xcc\xf7\x7d\xd6\xff\x79\xba\x55\xff\x2f\x8d\x7b\x1b\xf2" "\xed\xca\xe7\x86\x06\x23\xe2\xae\x88\xd8\x1d\x11\x77\x47\xc4\x9e\x88\xb8" "\x27\xa2\x9a\xf7\xbe\x88\xb8\xbf\xcd\xf2\x87\x9a\xd2\x0b\xfb\x3f\xe9\xb5" "\x88\xf8\xa7\xa9\xbb\xda\x31\x59\xff\xef\x85\x7c\x6e\x6b\x7e\xff\xaf\x3e" "\x0b\x36\xd8\x97\xa7\x76\x56\xe3\x2f\x25\x27\x4f\x97\x27\x0f\xe5\xdb\xe4" "\x60\x94\xb6\x66\xe9\xd1\x96\x7f\x3d\x89\xea\x24\x50\xfc\xfa\xd9\x62\xe5" "\x0f\x35\xf4\xff\xb2\x25\x2b\xbf\xe8\x0b\xe6\xf5\xb8\xd6\xbf\x75\xfe\x77" "\x4e\x8c\xcf\x8c\xaf\x39\xf0\xdc\xf5\x8f\x22\xf6\xf5\xb7\x8a\x3f\x9f\xc0" "\xcb\xe7\xb0\xf6\x46\xc4\xbe\x55\x96\x71\xfa\xc9\x6f\xf6\xcf\x7f\xa7\xaf" "\xbe\xb6\x7c\xfc\x4b\xe8\xc0\x3c\x53\xe5\xab\x88\x27\x6a\xfb\x7f\x2e\x9a" "\xe2\x2f\x24\x4b\xcf\x4f\x8e\xdc\x11\xe5\xc9\x43\x23\xc5\x51\xb1\xd0\xcf" "\xbf\x5c\x79\x63\xb1\xf2\xd7\x14\x7f\x07\x64\xfb\x7f\x5b\xcb\xe3\xbf\x1e" "\xff\x60\xd2\x38\x5f\x3b\xbd\xe0\x4f\x6c\x59\xae\x8c\x2b\xbf\x7f\xb2\xe8" "\x3d\xcd\x6a\x8f\xff\x2d\xc9\x5b\xf3\x0a\xff\x60\x7c\x66\xe6\xfc\x68\xc4" "\x96\xe4\xd8\xc2\xf7\x1b\x06\xb8\x8b\x74\x91\x3f\x8b\xff\xe0\x81\xd6\xed" "\x7f\x77\xfc\xb7\x25\x1e\x88\x88\xec\x20\x7e\x30\x22\x1e\x8a\x88\x87\xf3" "\xba\x3f\x12\x11\x8f\x46\xc4\x81\x25\xe2\xff\xf1\x95\xc7\xde\x5d\x7d\xfc" "\xeb\x2b\x8b\xff\x58\x5b\xfb\xbf\xfd\x95\xbe\x33\x3f\x7c\xb7\x58\xf9\x2b" "\xdb\xff\x47\xaa\x6b\x07\x8b\x8a\xad\xe0\xfc\xb7\xd2\x0a\xae\x69\xe3\x01" "\x00\x00\xc0\x26\x91\x46\xc4\x8e\x86\x81\xb4\x1d\x91\xa6\xc3\xc3\xb5\xff" "\x2f\xbf\x27\xb6\xa5\xe5\xa9\xe9\x99\xa7\x4e\x4e\xbd\x7f\xee\x44\xed\x19" "\x81\xc1\x28\xa5\xc5\x48\xd7\x40\xc3\x78\xe8\x68\x3e\x36\x5c\xa4\xc7\xf2" "\xf4\xa5\x3c\x7d\x38\x1f\x37\xfe\xa2\xef\xce\x6a\x7a\x78\x62\xaa\x7c\xa2" "\xab\x91\x03\xdb\xab\x6d\x3e\x49\x87\xeb\xe7\x82\x5a\xfb\xcf\xfc\xd1\xd7" "\xed\xda\x01\xeb\xce\xf3\x5a\xd0\xbb\xb4\x7f\xe8\x5d\xab\x6f\xff\xce\x1c" "\xb0\xd9\x2d\xd3\x8a\xd3\x8d\xaa\x07\xb0\xf1\x5c\xc5\xa1\x77\xb5\x6a\xff" "\x97\xba\x50\x0f\x60\xe3\xb9\xfe\x43\xef\xaa\xb7\xff\xcf\x57\x90\xb9\xe1" "\x71\xaf\xe6\x87\x37\x81\xcd\xc7\xf5\x1f\x7a\x97\xf6\x0f\x3d\x69\x55\xcf" "\xf5\xbf\xb8\x96\x5f\x03\xe8\xf0\x4a\x7c\x1d\xb1\x74\x9e\xe4\x76\xa9\x6a" "\x5b\x2b\x9f\x36\xbf\x53\xdc\x77\x2d\xff\xf5\x24\x62\x6e\xfd\x6b\x18\x69" "\x3b\x99\x23\xe2\x76\xd8\xaa\x9b\x7a\xa5\x7f\xc5\xbf\x6a\x71\xa1\x72\x69" "\xcd\x85\x76\xf7\xbc\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\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xd0" "\x29\xff\x06\x00\x00\xff\xff\x05\xe6\xe7\xcc", 1145); syz_mount_image(/*fs=*/0x20000440, /*dir=*/0x20000000, /*flags=*/0x8248, /*opts=*/0x20000080, /*chdir=*/0xfb, /*size=*/0x479, /*img=*/0x20000900); return 0; }