// 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 void reset_loop_device(const char* loopname) { int loopfd = open(loopname, O_RDWR); if (loopfd == -1) { return; } if (ioctl(loopfd, LOOP_CLR_FD, 0)) { } close(loopfd); } 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, 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) { int loopfd; memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(data, size, loopname, &loopfd) == -1) return -1; close(loopfd); 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) reset_loop_device(loopname); errno = err; return res; } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); memcpy((void*)0x20000180, "hfs\000", 4); memcpy((void*)0x200000c0, "./file0\000", 8); memcpy((void*)0x20000300, "part", 4); *(uint8_t*)0x20000304 = 0x3d; sprintf((char*)0x20000305, "0x%016llx", (long long)1); *(uint8_t*)0x20000317 = 0x2c; memcpy((void*)0x20000318, "file_umask", 10); *(uint8_t*)0x20000322 = 0x3d; sprintf((char*)0x20000323, "%023llo", (long long)5); *(uint8_t*)0x2000033a = 0x2c; memcpy((void*)0x2000033b, "creator", 7); *(uint8_t*)0x20000342 = 0x3d; memcpy((void*)0x20000343, "\x1b\x29\xf3\x51", 4); *(uint8_t*)0x20000347 = 0x2c; memcpy((void*)0x20000348, "iocharset", 9); *(uint8_t*)0x20000351 = 0x3d; memcpy((void*)0x20000352, "cp936", 5); *(uint8_t*)0x20000357 = 0x2c; memcpy((void*)0x20000358, "umask", 5); *(uint8_t*)0x2000035d = 0x3d; sprintf((char*)0x2000035e, "%023llo", (long long)4); *(uint8_t*)0x20000375 = 0x2c; memcpy((void*)0x20000376, "umask", 5); *(uint8_t*)0x2000037b = 0x3d; sprintf((char*)0x2000037c, "%023llo", (long long)0xfffffffffffffffe); *(uint8_t*)0x20000393 = 0x2c; memcpy((void*)0x20000394, "codepage", 8); *(uint8_t*)0x2000039c = 0x3d; memcpy((void*)0x2000039d, "cp1251", 6); *(uint8_t*)0x200003a3 = 0x2c; memcpy((void*)0x200003a4, "file_umask", 10); *(uint8_t*)0x200003ae = 0x3d; sprintf((char*)0x200003af, "%023llo", (long long)7); *(uint8_t*)0x200003c6 = 0x2c; memcpy((void*)0x200003c7, "umask", 5); *(uint8_t*)0x200003cc = 0x3d; sprintf((char*)0x200003cd, "%023llo", (long long)1); *(uint8_t*)0x200003e4 = 0x2c; memcpy((void*)0x200003e5, "codepage", 8); *(uint8_t*)0x200003ed = 0x3d; memcpy((void*)0x200003ee, "iso8859-13", 10); *(uint8_t*)0x200003f8 = 0x2c; memcpy((void*)0x200003f9, "fowner>", 7); sprintf((char*)0x20000400, "%020llu", (long long)0); *(uint8_t*)0x20000414 = 0x2c; memcpy((void*)0x20000415, "smackfsroot", 11); *(uint8_t*)0x20000420 = 0x3d; memset((void*)0x20000421, 33, 1); *(uint8_t*)0x20000422 = 0x2c; memcpy((void*)0x20000423, "measure", 7); *(uint8_t*)0x2000042a = 0x2c; *(uint8_t*)0x2000042b = 0; memcpy( (void*)0x20000440, "\x78\x9c\xec\xdd\x3d\x6f\xd3\x4e\x1c\x07\xf0\xef\x39\x49\x93\xf6\x1f\xe5" "\x6f\xda\x22\x04\x0b\x55\xa1\x12\x2c\x15\x05\x06\xc4\x92\x0a\x65\x65\x67" "\x42\x40\x92\x4a\x11\x56\x11\x6d\x91\x80\xa5\x01\x31\x22\x5e\x00\x3b\x6f" "\x01\xde\x03\x0b\x88\x37\x00\x13\x13\x2f\x20\xdb\xa1\x3b\x9f\x1d\xc7\xb9" "\x73\xd2\x34\x8f\xe5\xfb\x91\x1a\x5d\xce\xf7\xf0\x73\x6c\xe7\xee\x2c\x35" "\x06\x11\xfd\xb3\xee\xd5\x7e\x7e\xba\xf5\x5b\xfd\x09\x20\x87\x1c\x20\xa5" "\x3c\x56\x5b\x4a\x40\x1e\xc0\x79\x5c\x28\xbd\xd8\x3f\x6a\x1d\x05\xcd\x46" "\x56\x43\x39\x5d\x43\xfd\x09\x84\x35\x45\x5f\x99\xfa\x7e\xd3\x56\xb5\x94" "\x7a\xef\xab\xfa\x79\x94\x75\x2b\xdd\xe6\x69\x02\xa4\x94\xbb\xbf\x46\xa8" "\x77\x91\x07\xe4\x4c\x11\x8e\x4b\xcc\x03\x8a\xe6\x3a\xd4\xdb\xd3\xd7\xea" "\x7c\x73\x9f\xa4\x6d\xe0\xf2\x54\x43\x99\x03\xc9\x4f\x43\x74\xd0\xc1\x4b" "\x54\x66\x18\x0e\x11\x11\xcd\x01\x33\xfe\x7b\x66\x98\x28\xeb\x2c\x01\xcf" "\x03\xb6\xcc\xb0\xbf\x80\xe3\xbf\x5b\x67\xd6\x01\x8c\xd7\xed\xa0\x2f\x4b" "\x66\x56\x48\x8c\xff\x7a\x76\x27\x85\x3a\xbe\xff\xeb\x4d\xdd\xf5\x9e\x5e" "\xc2\xa9\xed\x5e\xb4\x4a\x1c\x26\x98\x42\xea\xfd\x12\xc2\x33\xab\x67\x36" "\x26\x06\xad\x2a\x75\x2c\xde\xf2\x5e\x2b\x8f\xed\xfa\x1b\x34\x3c\xbc\x45" "\xd5\x48\x14\x5b\xd7\xaf\x8d\xf0\xd4\x8d\x0c\x88\x76\xd3\xb2\x36\xcd\xe0" "\x6e\xad\x80\xfb\x2b\xe1\xde\xe8\x19\x65\x5a\x14\xd2\x5e\x2b\x68\x16\x55" "\xc2\x12\xff\xda\xc9\x7a\x3c\x3d\xf1\x55\x7c\x17\x0f\x85\x8f\x8f\x68\xc4" "\xf3\xbf\xbc\x14\xea\x30\xe9\x23\xe5\xa7\x8e\x94\x57\x50\xf1\xdf\x70\x34" "\x17\xed\xa3\xaf\x4a\xc1\x2c\xfb\xab\xd5\xaa\xd7\x53\xea\x9c\xee\xe4\x92" "\xe9\xc1\x18\xb0\x97\x25\xf7\xf4\x7d\xc9\xb4\x19\xdd\x20\x68\xc7\x11\x84" "\x71\x7e\x71\xd7\x5a\x45\xf2\xb6\x42\xb4\x77\x3b\xae\x9e\x4c\xad\x35\x5b" "\x2d\x3f\x7e\xe7\xa8\xb5\x8e\xf4\x2d\x0c\xd5\xd7\x76\xfd\x59\x90\x79\x2b" "\x65\x72\xd4\xb1\x11\x1f\xc4\x03\xb1\x89\x3f\xf8\x8c\x5a\x62\xfe\xef\xa9" "\xf8\xb6\x30\xcc\x95\xa9\xca\xe8\x92\xe6\xcc\x08\xf7\x67\xc9\x5e\x32\xaf" "\x4b\xfa\x89\x91\x23\x2c\xd8\xbd\x5c\x36\xe2\x08\x8c\xe2\xe8\x3b\x48\xc3" "\x7a\x8f\x27\xb8\x83\xca\xe1\xab\xd7\x4f\x73\x41\xd0\x3c\x50\x89\xc7\x96" "\xc4\xf3\xf2\x81\x30\x39\x85\x77\x80\xb5\xcc\x08\x89\xe2\x98\xda\x51\x09" "\xb4\xbb\x39\x52\x39\x96\x72\xd8\xea\x72\x7c\x61\xf4\x27\xae\x8f\xb5\x41" "\xf5\xfd\x11\xe7\xa8\xcb\xc7\x56\x58\x5d\x65\x71\x8e\x77\xb2\x2e\x2a\x13" "\xf9\x10\x46\x4d\x94\x30\x17\x61\x58\x13\xb5\x6f\xc0\x1c\x84\x71\xfa\x84" "\x94\x80\x63\xd3\xac\xbf\xa0\x68\x1a\x0e\x45\x74\xd0\x4d\xc6\xf2\x8c\x03" "\xa2\x69\x53\xf3\x2e\x21\x85\x1a\x39\xfe\x43\x77\x56\xa7\x97\x48\xea\xc5" "\xcf\x98\xa7\x67\x2f\x32\x7b\x5b\xdc\x89\x57\x70\xbd\x37\x11\x56\xf5\xeb" "\x8a\x7d\x05\xb7\xeb\x6a\xd6\xb9\x82\x4b\xf4\x78\xd3\xb1\x66\xd4\x6b\xae" "\x2b\xd7\x80\xab\x89\x4c\x81\xcc\xd5\x88\x6f\xe2\x3c\x23\x44\x0d\x3f\xf0" "\x88\xf7\xff\x89\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88" "\x88\x88\x88\x88\x88\x16\xcd\x34\xfe\xd3\xc0\xd9\xf9\xc6\x54\x77\x95\x88" "\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88" "\x88\x88\x88\x68\x61\xf5\x3f\xff\x17\x77\xc3\x5f\xe2\xce\x78\xfe\xaf\xed" "\x37\xe2\xf5\xf3\x7f\xfd\xd1\x9f\xff\x9b\x78\x50\x8e\xed\xf9\xbf\x44\x34" "\x7e\x7f\x03\x00\x00\xff\xff\xb0\x26\x7c\xf2", 767); syz_mount_image(/*fs=*/0x20000180, /*dir=*/0x200000c0, /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_NOSUID*/ 0x3000002, /*opts=*/0x20000300, /*chdir=*/0x21, /*size=*/0x2fc, /*img=*/0x20000440); return 0; }