// https://syzkaller.appspot.com/bug?id=dacdd83da50d42f90f00ea4b3c264efb31070b26 // 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; } uint64_t r[1] = {0xffffffffffffffff}; 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); intptr_t res = 0; memcpy((void*)0x20000040, "hfsplus\000", 8); memcpy((void*)0x20000640, "./bus\000", 6); *(uint16_t*)0x20000940 = 0; sprintf((char*)0x20000942, "%023llo", (long long)0); *(uint32_t*)0x20000959 = -1; sprintf((char*)0x2000095d, "%020llu", (long long)0); *(uint8_t*)0x20000971 = -1; memcpy((void*)0x20000972, "\x80\x49\x7b\xa6\x42\xf0\xe3\x22\x80\xc1\xc4\x17\xde\x8a\x71\xf0\xf9" "\xde\x4a\x08\x64\xe5\xda\x32\x99\xbb\xd7\x40\x66\x94\x8f\x35\x42\x2e" "\xf3\xbd\x81\xe1\x83\x67\x6e\x36\xf8\x2a\x64\x1f\x47\x9b\x00\x28\xe2" "\x18\x1a\x22\xc8\xa7\x92\x69\x4c\xfa\x0c\x2d\x09\xa5\x1a\xa4\x9d\xf6" "\xf9\x5e\x8f\x50\x2c\xa4\xdc\x06\xfb\x43\x43\x9c\xaf\xdb\xe7\x76\xe8" "\x7f\x36\x9f\xe1\x6d\x37\x70\x2b\x47\x82\xf2\xdf\x69\x46\x8e\x86\xe0" "\x39\xc2\x0d\x2a\x14\xbb\x17\xc9\xc1\x05\x26\xea\xac\xec\x78\x28\x73" "\x9d\x6b\xfa\x67\x7f\xab\x99\x8d\xeb\x96\x9c\xc0\x9b\xde\xc7\x70\x3e" "\x0c\xd5\xae\x92\x79\xa5\x5c\xe6\xc6\x48\xfc\x57\x3f\x6d\x07\xc3\xc8" "\x22\x7b\x13\xe5\x4f\x0e\xe7\xf4\x16\xf8\x39\x55\x24\xc3\xb2\x9f\xd6" "\x3f\xb5\xf9\x96\x52\xf5\xbb\x2d\x57\xb1\x2f\xe6\xe2", 183); memcpy( (void*)0x20000a29, "\xbc\x4a\x6f\x50\x3c\x3b\xae\x29\x49\x64\x7d\x5c\x7d\x11\xdd\x32\x9c\x5e" "\x7d\xf5\x5e\x25\x9e\x01\x81\x3a\x41\x1f\xa3\xdb\x5e\x7d\x66\xad\x80\x66" "\xc9\x36\xb2\xf7\xf5\x9c\x02\x41\x75\xcc\x0f\x30\xa7\x79\x27\xd0\x4a\x9c" "\x64\x94\x04\x03\x2b\x42\xaa\x17\x4d\xbe\x31\x30\x52\x8b\x21\x29\xdf\x7a" "\x1b\xa5\x83\xd5\xac\xd4\x41\x4f\x80\x9c\xf5\x6f\x46\x3a\xca\x49\x24\x63" "\xae\xf8\x28\xce\xca\x5d\x4c\x28\xe8\x35\xec\x9a\xdc\x34\xfc\x4f\x82\x73" "\x5a\x63\x3f\x45\xf5\x6b\x3e\x2a\xff\x00\x00\x00\x00\x00\x00\x00\x00", 125); *(uint8_t*)0x20000aa6 = 0; memcpy( (void*)0x20001300, "\x78\x9c\xec\xdd\xcd\x6b\x1c\xe7\x1d\x07\xf0\xef\xac\x56\xb2\xd7\x01\x47" "\x49\x6c\xc7\x2d\x81\x8a\x18\xd2\x50\x51\x5b\xb2\x50\x5a\xe5\x52\xb7\x94" "\xa2\x42\x28\x21\x3d\xf4\x2c\x6c\x39\x16\x5e\x2b\xa9\xa4\x14\x25\x94\x5a" "\x7d\xa3\xd7\x16\xf2\x07\xa4\x07\xdd\x7a\x2a\x94\xd2\x42\xc1\x90\xf6\xd8" "\xf6\x96\xab\x8e\x81\x42\x2f\xb9\x54\xbd\x74\xcb\xcc\xce\x4a\x6b\x5b\x92" "\x25\xdb\xf2\x4a\xce\xe7\x63\x66\x9f\xe7\x99\x67\xe6\x99\xdf\xfc\xe6\x6d" "\x77\x8d\xd8\x00\x9f\x5b\xb3\xe3\x69\xde\x49\x91\xd9\xf1\x37\x56\xcb\xf6" "\xc6\xfa\x54\x7b\x63\x7d\xea\x56\xaf\x9e\xe4\x44\x92\x46\xd2\xec\x16\x29" "\x16\x93\xe2\xe3\xe4\x4a\xba\x53\xbe\x50\xce\xac\x87\x2b\x76\xdb\xce\x87" "\x0b\x33\x6f\x7d\xf2\xd9\xc6\xa7\xdd\x56\xb3\x9e\xaa\xe5\x1b\x49\xeb\x11" "\xf7\x62\xad\x9e\x32\x96\x64\xa8\x2e\x1f\xd7\x78\x57\x1f\x79\xbc\x62\x2b" "\x33\x65\xc2\x2e\xf4\x12\x07\x83\x36\x9c\xa4\x73\x97\x1f\x9e\xdb\xee\xd9" "\x49\x67\xa8\xaf\xb1\xeb\xf5\x0e\x1c\x1f\x45\xf5\xdc\xfc\xd3\xab\xf7\xce" 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"\x86\xba\x45\x35\x9d\xe9\xd5\x47\xd3\x68\x26\x39\x99\x64\xa4\x5c\x6e\x2d" "\xf9\x67\xaf\x7e\x9c\xdd\x19\x74\x00\x00\x00\x00\xf0\x04\x3c\xbb\x99\xcd" "\xac\xe6\x74\xaf\xdd\x29\xaa\xcf\xfc\xe7\xaa\xcf\xfd\x27\xf3\x5e\x16\xb3" "\x92\x85\xac\xa4\x9d\xf9\x5c\xab\xbe\x0b\xe8\x7e\xea\x6f\x6c\xac\x4f\xb5" "\x37\xd6\xa7\x6e\x95\xd3\xfd\xe3\x7e\xf3\xdf\x07\x0a\xa3\x1a\x31\xdd\xef" "\x1e\x76\xde\xf2\xf9\x6a\x89\x56\xae\x67\xa1\x9a\x73\x31\x57\xf3\x4e\xda" "\xb9\x96\x46\xb5\x66\xe9\x7c\x2f\x9e\x9d\xe3\xfa\x69\x19\x53\xf1\x8d\xda" "\x3e\x23\xbb\x56\x97\xe5\x9e\xff\xba\x2e\x8f\x86\xd1\x2a\x23\xc3\x5b\x19" "\x99\xa8\x63\x2b\xb3\xf1\xdc\xde\x99\x38\xe0\xd1\xb9\x77\x4b\x93\x69\x6c" "\x7d\xf3\x73\x66\xff\x39\x3f\xb9\xf7\x56\x8a\xff\x75\x3a\xdd\xda\xa9\xde" "\x9c\xe4\x99\xef\x1e\xe9\x9c\x5f\xee\x3b\xfb\xce\xed\x9d\x89\xe4\xcb\x7f" "\xf8\xdd\x0f\x6e\xb4\x17\x6f\xde\xb8\xbe\x3c\x7e\x74\x76\xe9\x00\x4e\x74" "\x7a\x47\xe8\xfe\x4c\x4c\xf5\x65\xe2\xc5\xa7\x3e\x13\xfd\x26\x32\x9c\x46" 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"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe0\x78\x9b\x1d\x4f\xf3\x4e" "\x8a\x4c\x4e\x5c\x9c\xc8\x6f\xea\x99\xeb\x53\xed\xb2\xd8\xa8\xcb\xae\x66" "\x92\x46\x92\xe2\xc7\x49\xf1\x71\x72\x25\xdd\x29\xa3\x7d\xc3\x15\xbb\x6d" "\xe7\xc3\x85\x99\xb7\x3e\xf9\x6c\xe3\xd3\xed\xb1\x9a\xbd\xe5\x1b\x7b\xad" "\xb7\x3f\x6b\xf5\x94\xb1\x24\x43\x75\xb9\x93\xc6\x43\x8c\x77\x75\x8f\xf1" "\xf6\xa7\xd8\xda\xc3\x32\x61\x17\x7a\x89\x83\x41\xfb\x7f\x00\x00\x00\xff" "\xff\x21\xd6\x13\xde", 1607); syz_mount_image(/*fs=*/0x20000040, /*dir=*/0x20000640, /*flags=MS_SYNCHRONOUS|MS_MANDLOCK*/ 0x50, /*opts=*/0x20000940, /*chdir=*/2, /*size=*/0x647, /*img=*/0x20001300); memcpy((void*)0x20000000, "./bus\000", 6); res = syscall(__NR_creat, /*file=*/0x20000000ul, /*mode=*/0ul); if (res != -1) r[0] = res; memcpy((void*)0x20000200, "threaded\000", 9); syscall(__NR_write, /*fd=*/r[0], /*buf=*/0x20000200ul, /*len=*/0x175d9003ul); memcpy((void*)0x20000000, "./bus\000", 6); syscall(__NR_creat, /*file=*/0x20000000ul, /*mode=*/0ul); return 0; }