// https://syzkaller.appspot.com/bug?id=42b2a6ac6ef1edfd683c228311222c824208d634 // 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"); } else if (strncmp(fs, "gfs2", 4) == 0 && (strstr(opts, "errors=panic") || strstr(opts, "debug"))) { strcat(opts, ",errors=withdraw"); } 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=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x200000000180, "hfs\000", 4); memcpy((void*)0x200000000100, "./file0\000", 8); memcpy( (void*)0x200000000240, "\x71\x75\x69\x65\x74\x2c\x63\x6f\x64\x65\x70\x61\x67\x65\x3d\x69\x73\x6f" "\x38\x38\x35\x39\x2d\x31\x35\x2c\x70\x61\x72\x74\x3d\x30\x78\x30\x30\x30" "\x30\x30\x30\x30\x00\x00\x00\x00\x00\x00\x00\x00\x66\x2c\x00\xa2\x00\x00" "\x00\x07\x00\x00\x00\x00\xed\xe9\xde\xbf\x53\x0c\x3c\xc4\xd0\x4b\x54\x89" "\x19\xac\xa0\xc2\x93\x7d\x4d\xa1\xfc\x31\xdc\x42\xfc\x2e\x3e", 87); sprintf((char*)0x200000000297, "%020llu", (long long)0); sprintf((char*)0x2000000002ab, "%023llo", (long long)-1); *(uint16_t*)0x2000000002c2 = -1; *(uint16_t*)0x2000000002c4 = -1; memcpy( (void*)0x200000000580, "\x78\x9c\xec\xdd\x4f\x6b\x13\x4f\x1c\xc7\xf1\xcf\x6c\xd2\x26\xfd\x35\xf4" "\xb7\xfd\x23\x82\xc7\x6a\x41\x2f\x52\xeb\x45\xbc\xa4\x48\x1e\x84\x78\x10" "\xb5\x89\x50\x0c\x15\x6d\x05\xf5\x62\x15\x4f\x22\x7a\xf7\xee\x53\xf0\x29" "\x08\x5e\x14\x9f\x80\x9e\x3c\xf9\x00\x22\x08\x2b\x33\xbb\xf9\xb3\xe9\x66" "\x37\x86\x66\xb7\xc1\xf7\x0b\x2c\x9b\xec\xfc\xf9\x4e\x76\x76\x67\x26\x60" "\x46\x00\xfe\x59\xd7\x1a\xdf\xde\x5f\xfe\x61\xff\x19\xa9\xa4\x92\xf4\xea" "\xaa\xe4\x49\xaa\x4a\x65\x49\xa7\x74\xba\xfa\x68\xef\x60\xf7\xa0\xdd\x6a" "\xa6\x94\xd3\x09\x1c\x9b\xcb\x28\xcc\x69\x8e\x24\xda\xd9\x6b\x25\x66\xae" "\xc6\x5f\xfa\x36\x7f\x59\x35\x57\x0a\xa6\x2a\x08\x82\xed\xef\x92\xf6\x8b" "\x0e\x04\x85\x72\x77\x7f\x02\x4f\xaa\x44\xf7\xb3\x3b\x5f\xcd\x3d\xb2\x74" "\xcf\x27\xcc\x77\x78\xcc\x71\xcc\x1a\xd3\x51\x47\x8f\xb5\x54\x74\x1c\x00" "\x80\x62\x45\xe3\xbf\x17\x8d\xf3\xb5\x68\xfe\xee\x79\xd2\x46\x34\xec\x9f" "\xc8\xf1\x7f\x52\x9d\xa2\x03\x98\xba\x20\xf5\xec\xc0\xf8\xef\x56\x59\x81" "\xb1\xd7\xf7\x7f\x77\xaa\xbf\xde\x73\x4b\x38\x7b\xde\xeb\xae\x12\xc7\xa9" "\x79\x6e\xe8\xf5\xbc\xc2\x9e\x15\x9b\x60\x9a\xac\x55\xa5\x8b\xc5\x5b\xb8" "\xbb\xdb\x6e\x5d\xdc\xb9\xdf\x6e\x7a\x7a\xa1\x7a\x64\x20\xd9\x9a\xfb\xdb" "\x0c\xbb\x6e\x57\x46\xb4\xeb\x09\x6b\xd3\x14\x63\xb4\xdd\x24\xcf\x28\x17" "\x5d\x1b\xe6\x6c\x1b\xb6\x46\xc4\xbf\x3a\x61\x8d\x13\x33\x9f\xcc\x17\x73" "\xd3\xf8\x7a\xa7\x66\x6f\xfe\x57\x0e\x8c\xbd\x4c\xee\x4a\xf9\x43\x57\x2a" "\x8c\x7f\x73\x74\x89\xae\x95\xbe\x4d\xa5\xe8\xb1\x51\xaf\xd7\xbd\x58\x92" "\x65\x57\xc9\x99\xa8\x86\x48\x46\x2b\xab\xc9\x2b\x12\x75\x7b\xd4\xb2\xe2" "\x5f\x10\xf8\x59\x71\xba\x5c\x2b\x43\xb9\xc2\xd6\x5d\xca\xc8\xb5\x1a\xe6" "\xda\x5e\x88\xe5\xda\xea\xbe\x1a\x91\x6b\x2d\x56\x97\x6d\x4d\xaf\x37\x8f" "\xae\x6f\xda\xcc\x1b\x73\xdd\xac\xeb\xa7\x3e\xa8\x31\x30\xff\xf7\x6c\x7c" "\x1b\x4a\xbd\x33\xfb\x77\x8d\xa9\x44\x07\xf6\x13\x0f\xdb\x33\x9f\x5c\x5d" "\xd9\x95\xe9\x1f\x19\x39\x0e\x75\xa3\x16\x7f\xa7\xf7\x29\x56\x86\x8a\xe8" "\x3d\x4f\x7e\xa5\x3f\xd3\x30\xe4\x59\xca\xb9\xd7\xba\xa3\x2b\x5a\xda\x7f" "\xf2\xf4\x5e\xa9\xdd\x6e\x3d\xb4\x07\xb7\x13\x0e\x1e\xd4\xba\x57\xbd\x35" "\xf7\x52\x4a\x4c\x53\xc0\x81\xa7\xfe\x3b\x3a\xec\x9f\xaa\x28\xfc\x22\xf2" "\x48\xae\x6e\x27\xca\x33\xd4\x0b\xc7\x5a\xa0\x7d\x7e\x64\x26\xb6\x77\x59" "\x2e\x0d\x3c\x31\x3d\xa1\x88\x83\xc6\xe7\x7c\x3b\x52\x11\x07\x39\x3c\x9f" "\x50\xb8\xfe\x45\xcf\x4c\xfa\x31\x97\x80\x90\x37\x37\xef\x0a\xd7\x7f\x03" "\xeb\x95\x4d\x37\xec\xdb\x3f\x7e\xca\x3c\x3d\x73\x42\x16\x95\x18\xd8\x39" "\x76\x6f\x05\x54\x8d\xe5\x5f\x71\x47\xff\xfd\xd5\x0a\x6e\x71\xf4\x0a\x6e" "\xdc\x35\xd7\xd9\xf3\xd2\xb9\xde\x5b\xbf\x83\x8c\x1a\xfd\x28\xce\xd9\x10" "\xa4\x4d\xfd\x2c\xd3\xd0\x57\xdd\xe2\xfb\x7f\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x80\x59\x93\xc7\x7f\x27\x28\xba\x8d\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xcc\xba\xde" "\xfe\xbf\xea\xee\xff\xab\xf1\xf6\xff\x1d\xfe\xe5\xef\x52\xb8\xc3\xcb\x24" "\xfb\xff\xba\x9f\x03\x1f\xd8\x28\xc7\x7f\xbb\x27\xf6\xff\x05\xa6\xef\x4f" "\x00\x00\x00\xff\xff\xf5\xe5\x86\x47", 729); syz_mount_image(/*fs=*/0x200000000180, /*dir=*/0x200000000100, /*flags=*/0, /*opts=*/0x200000000240, /*chdir=*/0x11, /*size=*/0x2d9, /*img=*/0x200000000580); return 0; }