// 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 #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) { 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; } 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*)0x20000040, "hfs\000", 4); memcpy((void*)0x20000280, "./file1\000", 8); memcpy((void*)0x20000080, "iocharset", 9); *(uint8_t*)0x20000089 = 0x3d; memcpy((void*)0x2000008a, "cp775", 5); *(uint8_t*)0x2000008f = 0x2c; memcpy((void*)0x20000090, "file_umask", 10); *(uint8_t*)0x2000009a = 0x3d; sprintf((char*)0x2000009b, "%023llo", (long long)0x1fbc); *(uint8_t*)0x200000b2 = 0x2c; *(uint8_t*)0x200000b3 = 0; memcpy( (void*)0x20000580, "\x78\x9c\xec\xdd\xcf\x6a\x13\x51\x14\xc7\xf1\xdf\x9d\xa4\x26\xda\x52\xa7" "\x7f\xa4\xe0\xb2\x5a\x70\x25\x6d\x5d\x28\x6e\x04\xc9\x43\xb8\x10\x51\x9b" "\x08\xc5\x50\x41\x5b\x50\x57\xe2\x5a\x7c\x00\xf7\xee\x5c\x8b\xcf\xe0\x4a" "\x7c\x01\x5d\xb9\xf2\x01\xb2\x1b\xb9\x67\xa6\xc9\x34\xc9\x64\x52\x35\xb9" "\x6d\xf3\xfd\x40\x86\x69\xe6\x9e\x99\x73\x3b\x77\x32\xf7\x04\xc2\x08\xc0" "\xcc\xba\xdb\xf8\xf1\xf1\xc6\x2f\xff\xea\xbe\x75\x5b\x8a\x24\xd5\xa5\xaa" "\xa4\x4b\x5a\xab\x1f\xec\xed\xef\xee\xb7\x5b\xcd\x51\x3b\xaa\x58\x84\x7f" "\x39\xa5\x91\x6e\xa0\xcd\xce\x5e\x6b\x58\xa8\x8f\xb3\x88\x4c\xec\xff\xaa" "\x6a\x21\xff\x1e\x26\x23\x49\x92\xe4\x67\xe8\x24\x10\x9c\xb3\x2b\x78\x50" "\x24\xd5\xb2\xab\xd3\xb6\xd7\xa7\x9e\xd9\x64\xbc\x09\x9d\x40\x60\xae\xa3" "\x8e\x5e\x6a\x31\x74\x1e\x00\x80\xb0\xb2\xfb\x7f\x94\xdd\xe7\x17\xb2\xf9" "\x7b\x14\x49\x1b\xd9\x6d\xff\x4c\xdd\xff\x3b\xa1\x13\x08\x2c\x77\xff\xb7" "\x2a\x2b\x71\xfe\xfc\x5e\xb4\x4d\xbd\x7a\xcf\x4a\x38\xbf\x3d\x1a\xa8\x12" "\x8f\xe1\x9c\xd2\x91\x75\x64\x82\xe9\xca\xaa\x4a\xcb\x25\x3a\xff\x64\xb7" "\xdd\xba\xbe\xf3\xac\xdd\x8c\xf4\x56\x77\x32\xb9\x66\xab\xb6\x6c\xa6\x43" "\xf7\x90\x65\x9b\x14\x66\xbb\x3e\xa4\x36\x1d\xe1\xef\xfb\x3e\x6f\x7d\x98" "\xf3\x7d\xd8\x2e\xc8\x7f\xc5\x96\x37\x0f\xfe\xd3\x11\xcb\xb9\xaf\xee\x9b" "\x7b\xe0\x62\x7d\x50\xb3\x3b\xff\xab\x26\xce\x9f\x26\x3b\x53\x71\xdf\x99" "\x4a\xf3\xdf\x2c\xde\xa3\xf5\x32\x4e\x5b\x15\xf4\x72\xc9\x0e\x72\x39\x3b" "\x82\xbe\x7c\x52\x79\x2f\xeb\xc3\x2b\x12\x1d\x8e\xa8\x25\x1d\xfd\x82\x20" "\x2e\xcb\xd3\xa2\x96\xfb\xa2\xd2\xde\x6d\x95\x44\xad\x0c\x8d\xda\x2e\x89" "\x5a\xed\x8f\xea\x8e\xe6\x80\x1f\xa3\xee\xbd\xbb\xe7\xd6\xf5\x5b\x9f\xd5" "\xc8\xcd\xff\x23\xff\xdf\xde\xd0\x38\x57\xa6\x6f\x63\x2d\xb3\x91\xe1\xaf" "\xce\xc2\x96\x55\x6b\x19\x8f\x91\x58\x74\xac\x6e\xe0\xdf\xbc\xd3\x63\xdd" "\xd2\xe2\x8b\x57\xaf\x9f\x3e\x6a\xb7\x5b\xcf\x59\x99\xf9\x95\xb9\x6c\x68" "\x9c\x94\x7c\x58\x19\xb1\x52\x51\x4d\x13\x3d\x44\xe0\xcf\x27\x4c\x45\xef" "\xa4\x6b\xed\x7e\xe8\x64\x10\x82\x9f\x77\xb9\xb4\xfe\xcb\xd5\x2b\x9b\x56" "\x22\xf9\x45\x3c\x62\x9e\x9e\xf8\x45\x6d\xc4\xce\x73\x7b\xdc\x2a\xa8\x0d" "\x96\x6d\x79\x61\x48\x05\x57\x5c\x1b\xcc\x17\x57\x70\xe3\xd6\x5c\x57\xae" "\x49\x57\xc7\x3f\x62\x9c\xe5\x79\x46\xb8\x86\xbe\xeb\x21\xdf\xff\x03\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x9c\x36\xd3\xf8\xc5" "\x42\xe8\x3e\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x70\xda\xf5\x9e\xff\x6b\x4f\x00\xab\xf0\xfc\x5f\x60\x76\xfc\x09" "\x00\x00\xff\xff\x65\x88\x7f\x68", 602); syz_mount_image(0x20000040, 0x20000280, 0x321c4d8, 0x20000080, 4, 0x25a, 0x20000580); memcpy((void*)0x20000100, "\x2a\x3c\x61\xe3\xad\xb4\x44\xed\x37\xb6\x0d\x58\xc0\x98\xe5\x0e\xcf" "\x35\xb0\x25\xcb\xf2\xcb\x9d\x2d\x81\xdf\xdb\x88\xaa\xe0\xb6\x87\xd1" "\xc4\xd3\xa0\x7d\xa7\x5b\x6d\xc7\x3c\xcc\x0b\xa5\x8a\x97\x43\x08\xf5" "\x6b\xdf\x0a\x41\xf9\xfd\x08\xf0\x48\x83\xdc\x5f\xf8\x82\x0c\x04\x80" "\xdc\x1a\x05\xbc\x37\x90\xe9\xb6\x92\x54\x04\xa9\x83\xf3\xd7\x58\xd1" "\xca\xf0\x71\x21\x4a\xb2\xbc\x12\x47\x3f\x87\x1b\x6e\x71\xba\x10\x9a" "\x1a\xe2\xa0\xa7\x5c\x3c\x5f\xa2\xd4\xce\x67\xe8\x6b\x17\x57\x94\xe7" "\x64\xcc\xf0\x43\xb2\x76\xfb\xac\x0f\x4a\x6c\x2a\x24\x28\x8d\xbb\x84" "\xe6\x3f\x5d\xbb\x40\x13\x6f\x9d\xda\x24\xd9\x4d\xec\xe9\x58\x5d\xf5" "\x63\xc3\x6f\xe9\xb6\x7a\xd5\xd8\x36\x81\x18\xbe\xc3\xba\x04\xd2\x49" "\x0a\x3d\xe8\x75\x05\x79\xde\x13\x44\xb2\xf0", 181); memcpy((void*)0x200000c0, "./file0\000", 8); syscall(__NR_mount, 0x20000100ul, 0x200000c0ul, 0ul, 0x269415ul, 0ul); return 0; }