// 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, 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*)0x20000240, "hfs\000", 4); memcpy((void*)0x20000280, "./file0\000", 8); memcpy((void*)0x20000080, "\x63\x6f\x64\x65\x70\x61\x67\x65\x3d\x64\x65\x66\x61\x75\x6c\x74\x00" "\xde\x06\x2c\x4c\x5b\x34\x3d\x75\x53\x7e\x31\x10\x83\x31\xbc\xb9\xd7" "\x30\xfa\x94\xf2\x50\x49\xb6\xdb\x9e\x70\x9c\x93\xe2\x3d\xe7\x63\xa8" "\xdf\xd5\x30\x48\x05\x06\x18\x95\x4a\xf8\x5a\x74\x7e\x44\x46\x69\x5e" "\x36\x46\x13\x8b\x5b\x6e\x83\x7e\x54\xc1\xf1\x9e\x3d\x9d\x72\x00\x93" "\x8a\xd0\x83\xed\x53\xc6\xd6\xea\xeb\xc1\x69\x95\x69\x0f\xdf\x16\xa1" "\x44\x8e\x9d\x41\x56\x7b\xfe\x6d\xac\x05\x2d\xe0\x26\x78\x8c\xcc\xa4" "\x8e\x79\xc6\x75\xd5\x98\xb4\x66\xa0\x73\xac\x72\x6a\x1d\xd6\xcf\xe1" "\x68\x94\x04\x38\xeb\x4f\x76\x02\xf1\xf0\x55\xd3\xf4\xe2", 150); memcpy( (void*)0x20000680, "\x78\x9c\xec\xdd\xcd\x6e\xd3\x4c\x14\xc6\xf1\x67\x26\xe9\x9b\xbc\xb4\x2a" "\xee\x07\xaa\xc4\xb2\x50\x89\x15\x6a\xcb\x06\xb1\x41\x42\xb9\x08\x16\x08" "\x01\x4d\x90\x2a\xa2\x22\x41\x91\x80\x0d\x88\x35\xe2\x02\xd8\x73\x0b\xac" "\x59\xb3\x42\xdc\x00\xac\x58\x71\x01\xd9\x19\xcd\x78\xda\x38\x1f\xb6\x9b" "\xa2\x64\x68\xfa\xff\x49\x71\xdd\x78\xc6\x73\x4e\x6d\xc7\x73\x22\x55\x16" "\x80\x73\xeb\x4e\xeb\xc7\xa7\x1b\xbf\xdc\xcb\x48\x35\xd5\x24\xdd\x92\xac" "\xa4\xa6\x54\x97\x74\x49\x1b\xcd\x17\x07\x87\xfb\x87\xdd\x4e\xbb\x6c\x47" "\x35\xdf\xc3\xbd\x8c\xb2\x9e\x66\xa4\xcd\xde\x41\x67\xb4\xa3\xcd\x7e\xd4" "\xfb\xef\x24\xee\xb7\xba\x96\xf2\xef\x61\x3a\xd2\x34\x4d\x7f\xc6\x0e\x02" "\xd1\xf9\xab\x7f\x0c\x2b\x35\xc2\xd5\xe9\xb7\x37\x67\x1e\xd9\x74\xbc\x8d" "\x1d\x40\x64\xa6\xa7\x9e\x5e\x6a\x39\x76\x1c\x00\x80\xb8\xc2\xfd\xdf\x86" "\xfb\xfc\x52\x98\xbf\x5b\x2b\x6d\x85\xdb\xfe\x5c\xdd\xff\x7b\xb1\x03\x88" "\x2c\x77\xff\xf7\x55\x56\x6a\xdc\xf1\xbd\xe8\x37\xf5\xeb\x3d\x5f\xc2\xb9" "\xed\xf6\xa8\x4a\x3c\xcd\x58\xff\x29\x3b\xb3\x06\x26\x98\xa6\xaa\xaa\xf4" "\xb1\xd8\xff\x1f\xef\x77\x3b\xd7\xf7\x9e\x76\xdb\x56\xef\x74\x3b\xc8\x35" "\x5b\xf7\xcb\xf6\x71\x1d\xe9\x55\x44\xbb\x39\xa6\x36\x2d\x71\xfa\xdc\x17" "\x7d\x0e\x0b\x2e\x87\xdd\x82\xf8\xd7\x2a\x46\x4c\x33\x6f\x26\x1f\xbc\x80" "\xf9\x6a\xbe\x99\xfb\x26\xd1\x47\xb5\x8f\xe7\x7f\xf5\xd4\xb8\xc3\xe4\x8f" "\x54\x32\x74\xa4\xb2\xf8\xb7\x8b\xf7\xe8\xb3\x4c\xb2\x56\x05\x59\xae\xf8" "\x41\x2e\x87\x11\x46\xb3\x1c\xa7\x39\xbe\x22\xd1\xd1\x19\xb5\xa2\xc1\x2f" "\x08\x92\xaa\x38\x7d\xaf\xd5\xa1\x5e\x59\x76\x3b\x15\xbd\xd6\xc6\xf6\xda" "\xad\xe8\xb5\x3e\xdc\xab\x7f\x36\x17\xf7\x9c\x36\xf3\xc1\xdc\x35\x9b\xfa" "\xad\xcf\x6a\xe5\xe6\xff\xd6\xfd\xb5\xb7\x74\x92\x2b\xd3\xb5\xf1\x2d\xc3" "\x99\x51\x9a\x4f\xdd\xb7\x4c\x4e\x10\x98\x9d\x28\x0d\xfc\x9d\xf7\x7a\xa4" "\x9b\x5a\x7e\xfe\xea\xf5\x93\x87\xdd\x6e\xe7\x19\x2b\xe7\x7e\x65\x21\x9c" "\x1a\xff\x4a\x3c\xac\x94\xac\xd4\xd4\xd0\x54\x87\x18\xfa\xbc\xe0\xd3\x79" "\x2e\xf5\x0f\xba\x36\xee\xc5\x0e\x06\x31\xb8\x2b\xdb\x64\xf5\x5f\xae\x5e" "\xd9\xf6\x25\x92\x5b\x24\x25\xf3\xf4\xb4\x6a\xe7\xb9\x3d\xee\x14\xd4\x06" "\xab\x7e\x79\x61\xa2\x0a\x6e\xb1\xb8\x82\xcb\xd7\x5c\x8d\x92\x9a\xeb\xca" "\x35\xe9\xea\xc0\x88\x5f\x1a\x25\x23\x26\x21\xce\x39\x61\x5a\xfa\xae\x07" "\x7c\xff\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x70" "\xd6\xcc\xe2\x3f\x16\x62\xe7\x08\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\xc0\x59\x17\xff\xf9\xbf\xe1\x99\x62\x3c\xff\x17" "\x98\xb9\x3f\x01\x00\x00\xff\xff\x6c\x1f\x84\x81", 606); syz_mount_image(/*fs=*/0x20000240, /*dir=*/0x20000280, /*flags=*/3, /*opts=*/0x20000080, /*chdir=*/3, /*size=*/0x25e, /*img=*/0x20000680); return 0; }