// https://syzkaller.appspot.com/bug?id=ee3412290692b3354be3b0194d29fc55a6b4c242 // 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 279 #endif #ifndef __NR_mmap #define __NR_mmap 222 #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*)0x20000100, "hfs\000", 4); memcpy((void*)0x200000c0, "./bus\000", 6); *(uint64_t*)0x20000040 = 0; *(uint16_t*)0x20000048 = 0; *(uint32_t*)0x2000004a = 0; *(uint8_t*)0x2000004e = -1; *(uint8_t*)0x2000004f = -1; memcpy( (void*)0x200005c0, "\x78\x9c\xec\xdd\x4f\x6b\x13\x4f\x1c\xc7\xf1\xcf\xec\x26\x9b\xf4\xd7\xd2" "\x5f\xfa\x47\x0a\x1e\x44\xaa\x82\x27\xb1\xf5\x22\x5e\x04\x2d\x3e\x06\x0f" "\x22\x6a\x1b\xa1\x18\x2a\xd8\x0a\xea\x45\xf0\x2c\xe2\xd9\xbb\x37\xcf\xe2" "\x63\xf0\x24\x3e\x01\x7b\xf2\xe4\x03\xe8\x6d\x65\x66\x36\xc9\x66\x9b\xcd" "\x6e\x6a\x9a\x6d\xe9\xfb\x05\x89\x9b\xec\xcc\xce\x77\x76\x76\xb3\xfb\x8d" "\x29\x23\x00\x67\xd6\x9d\x8d\x5f\x9f\x6f\xfc\xb6\x0f\x23\x85\x0a\xe3\x38" "\x8e\xa5\x40\x52\x53\xaa\x49\x3a\xa7\x95\xe6\xcb\x9d\xbd\xed\xbd\x4e\x7b" "\x6b\xd4\x86\x42\x5b\x63\xfb\xe2\x05\xc9\xc8\xd7\xac\x1d\x2a\xb3\xb9\xd3" "\x1e\x56\x75\x46\x83\xa5\x5b\xf6\x55\x4d\x73\x43\xb6\x80\x09\xb3\xe3\xbd" "\xef\x17\xeb\x55\xc7\x82\xea\xb8\xb3\x7f\x88\x40\x6a\x24\x67\xa7\x5b\xdf" "\x9c\x7a\x64\x13\x10\xa7\x5f\x04\xd5\xc5\x71\x82\x98\x03\x1d\x54\x1d\x03" "\x00\xa0\x5a\x77\x93\x7f\x4d\xff\xe2\x38\xe7\x5f\x2a\x08\xa4\x2b\xc9\x65" "\xff\x74\x5d\xff\x0b\x2e\xf3\x67\xfd\xe2\xe7\xae\xff\xaf\x34\xdf\xcd\xbc" "\x62\x63\xc7\xf7\x7f\xb7\xaa\x9f\xef\xd9\x43\xc0\xad\x0f\xba\x59\xa2\x14" "\xbf\x2d\xd7\x42\x3f\x79\x8b\xe4\xc7\x63\xe0\x06\xd3\x14\x65\x95\x2e\x96" "\x60\xe6\xe9\x76\xa7\x7d\x6d\xf3\xf9\xbd\x86\x7f\xf7\xb6\x93\x2a\xb6\xec" "\x9e\xb7\x06\x07\xbc\x1f\xed\x50\xab\xbe\x63\x65\x15\x6c\x6d\x84\x59\xfb" "\x14\xd4\x6d\x1f\xd6\x03\xbd\x4b\xa2\x1f\x88\x7f\xe9\x08\x2d\x8e\x15\x7d" "\x9c\xad\xfc\xdd\xfc\x30\x0f\x4d\x4b\x9f\xb4\xe5\xc6\xdf\xaa\xc5\xc6\x0e" "\x93\x1b\xa9\x56\xe6\xec\xf0\xf1\x5f\xcf\x6f\xc1\xf5\xb2\xe5\x4b\xe5\xf4" "\x72\xc1\x35\x72\x3e\x69\x41\xdf\xbe\x94\xe8\x65\x73\x78\x46\xa2\xee\x11" "\xb5\x90\x3a\xc6\x4c\x3f\x02\xe9\x63\x34\xa2\xd6\x62\xe6\x8b\x09\xdf\xbb" "\xb5\xfc\xde\xb9\x5a\x4b\xbd\x5a\x51\xaa\xd6\x7a\x41\xad\xe5\x6c\x5b\xdd" "\xa3\xb9\x33\xf2\xab\x94\xe3\x65\x3e\x98\xfb\x66\x55\x7f\xf4\x55\x1b\xbd" "\xf1\xb7\xa7\x4f\xe8\x3f\xea\x8b\xcf\x4c\x5b\xc6\x95\x4c\x8e\x8c\x91\xfd" "\xa9\xb9\x92\xad\x12\x81\x91\x98\x4d\xd3\x7b\x3d\xd1\x4d\xcd\xef\xbe\x7e" "\xf3\xec\x71\xa7\xd3\x8e\x94\x2c\xbc\xd8\x9d\xc6\x42\x5d\xd2\x94\xda\xea" "\x1e\x56\x03\xab\xec\x1b\xd3\xe9\xe9\x44\x16\x6a\xc7\x34\x3a\xc1\xa1\x41" "\xb1\xca\xed\xd5\xdc\x55\x61\xfe\xaa\xcc\x42\x7c\x4c\x7b\x2c\xaa\x7a\xbc" "\xec\xc2\x7e\x43\x2a\x53\x38\xd2\x91\x9a\x08\xd5\x28\xbd\x9f\xd3\xb5\xbc" "\x12\x85\xab\xf9\x58\xc2\x74\xf5\x07\x5d\x2b\x0f\xaa\x0e\x06\x55\xb0\x17" "\x48\xe3\xf3\x3f\x9f\xaf\xc8\xdd\xd5\xb9\x24\xc3\xdd\x57\x8f\xb8\x4f\xcf" "\x26\x17\x87\xa4\x32\xa0\xb5\x9c\xdc\x60\xd1\x3d\xff\x37\x56\x06\x37\x9b" "\x9f\x03\x95\xcd\xb9\x2e\x5d\x95\x2e\x17\xb6\xd8\x6b\xa6\x91\xc4\x79\x72" "\xc5\x03\xbb\xa4\xe0\x7f\xf3\xcc\x86\x7e\xea\x51\xea\xfe\x1f\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xa7\x42\xef\xf7\xdf\xd1" "\x64\xff\x04\x62\x26\xd9\xbe\xfb\x65\x39\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf8\x27\xd9\xf9\x7f\x25\xdd\xea\xce" "\xff\x1b\x8e\x3d\xff\xaf\x7b\xb8\xf9\x7f\xeb\xc3\x66\x29\xca\x99\xff\xd7" "\xcd\x29\x96\x3f\xff\xef\x58\xb3\x1d\x01\x28\xef\x6f\x00\x00\x00\xff\xff" "\xe1\xec\x73\x84", 724); syz_mount_image(/*fs=*/0x20000100, /*dir=*/0x200000c0, /*flags=MS_SYNCHRONOUS|MS_NOATIME*/ 0x410, /*opts=*/0x20000040, /*chdir=*/1, /*size=*/0x2d0, /*img=*/0x200005c0); return 0; }