// https://syzkaller.appspot.com/bug?id=d4a58de9696a60f9c0d79531cdc0d622e474e786 // 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*)0x20000480, "hfs\000", 4); memcpy((void*)0x20000280, "\023\023w\305\3745\324\024T\325\324\035)\255\032`)" "Y\201F\346\276\026nA\255\r\275@T\003<\2373\273\332\202$" "\242\363\327r\347cnH\263<\277p\203r\350\361\271\223>" "\305\022wC\276\"\006 \236\360-\371\313\362\366\350\200\3238/\000", 78); memcpy((void*)0x20000040, "uid", 3); *(uint8_t*)0x20000043 = 0x3d; sprintf((char*)0x20000044, "0x%016llx", (long long)0); *(uint8_t*)0x20000056 = 0x2c; memcpy((void*)0x20000057, "file_umask", 10); *(uint8_t*)0x20000061 = 0x3d; sprintf((char*)0x20000062, "%023llo", (long long)0x2e0); *(uint8_t*)0x20000079 = 0x2c; memcpy((void*)0x2000007a, "iocharset", 9); *(uint8_t*)0x20000083 = 0x3d; memcpy((void*)0x20000084, "iso8859-6", 9); *(uint8_t*)0x2000008d = 0x2c; memcpy((void*)0x2000008e, "codepage", 8); *(uint8_t*)0x20000096 = 0x3d; memcpy((void*)0x20000097, "iso8859-6", 9); *(uint8_t*)0x200000a0 = 0x2c; memcpy((void*)0x200000a1, "creator", 7); *(uint8_t*)0x200000a8 = 0x3d; memcpy((void*)0x200000a9, "\x4d\xdd\x71\x75", 4); *(uint8_t*)0x200000ad = 0x2c; *(uint8_t*)0x200000ae = 0; memcpy( (void*)0x200004c0, "\x78\x9c\xec\xdd\xcf\x6b\x13\x4d\x1c\xc7\xf1\xcf\x6c\xd2\x26\x7d\x5a\xfa" "\xe4\x79\x5a\x11\x3c\x88\x54\x03\xf6\x22\x5a\x2f\xe2\x25\x22\xf9\x23\x3c" "\x89\xda\xa4\x50\x5c\x2a\x6a\x8b\x3f\xf0\x50\xc5\x93\x88\xbd\x7b\xf7\x5f" "\xf0\x6f\x10\x2f\x8a\xe0\xb9\x9e\x3c\x89\xe7\x7a\x90\x95\x99\x9d\x64\xb3" "\x49\x36\x49\xa5\xc9\xb6\xfa\x7e\x81\x61\xb3\xb3\xb3\xf3\x9d\xcc\xce\xce" "\xcc\x82\x5d\x01\xf8\x6b\x5d\xad\xef\xbe\xb9\xf8\xd5\xfe\x33\x52\x41\x05" "\xe9\xc5\x65\x29\x90\x54\x96\x8a\x92\x8e\xe9\x78\x79\x6b\x63\x73\x7d\x33" "\x6c\x36\x06\x9d\xa8\xa0\x93\xa5\x38\x97\x51\x9c\xd3\xf4\x1c\xb3\xba\xd1" "\xec\x97\xb5\x2c\x9f\xc3\xab\xd8\x6f\x45\xcd\x75\xee\xc3\x78\x44\x51\x74" "\xe5\x4b\xde\x41\x20\x77\xae\xf7\x47\x85\xf4\xce\x53\xee\x4e\x50\xf2\xbd" "\xd3\x25\x96\x73\x8a\x2f\xcb\xd3\xfd\x67\xf9\x3e\x23\x69\x7b\x1c\xc1\x1c" "\x21\x66\x4f\x7b\x7a\xa8\xf9\xbc\xe3\x00\x00\xe4\xcb\xc4\xe3\x7b\xe0\xc7" "\xf9\x39\x3f\x7f\x0f\x02\xa9\xea\x87\x7d\x37\x1b\x3f\x6c\xe3\xff\xef\xda" "\xcb\x3b\x80\xb1\x8b\x06\xa6\x76\x8c\xff\xae\x5d\x23\x63\xdb\xfd\x5f\x97" "\x94\xac\xf7\xdc\x12\xce\xa6\x07\xad\x55\xe2\x28\x25\x4f\x75\x7d\x9f\x56" "\x7c\x65\xa5\x66\x97\x66\xd8\xaa\xd2\xc5\x12\xcc\xac\xad\x87\xcd\x73\xab" "\x77\xc2\x46\xa0\x67\xaa\x79\x1d\x87\x2d\xba\xcf\x46\x7c\xe9\xb6\x0c\x89" "\x76\xa9\xcf\xda\x74\x80\xf6\xd9\x66\x32\x0f\x31\xfd\x67\x94\xb3\xae\x0e" "\x53\xb6\x0e\x2b\x71\xfc\x0f\x24\xa5\xe2\x5f\x18\x58\xe2\x18\x98\xf7\xe6" "\xa3\xb9\x6e\x2a\x7a\xad\x46\x7b\xfe\x57\x8c\x8c\x6d\x26\xd7\x52\x95\xae" "\x96\x8a\xe3\x3f\x9f\x7d\x46\x57\xcb\x8a\x3d\x4a\xfe\xb6\x51\xab\xd5\x82" "\xd4\x21\xff\xb9\x42\x4e\xf8\x12\xbc\x21\xb5\x2c\xab\x90\x55\xe2\xb4\x3f" "\x67\xea\x01\x41\x65\x58\x9c\x2e\xd7\xff\x5d\xb9\xe2\xda\x5d\x18\x92\x6b" "\xa1\x6f\xae\x15\xb7\xbd\xac\x20\x23\xd7\x62\x2a\x97\xad\xcd\xda\x7a\xf8" "\x2e\xbb\xa8\x89\x30\xaf\xcc\x35\xb3\xa4\x6f\x7a\xab\x7a\xc7\xfc\x3f\xb0" "\xf1\x55\x35\xb0\x67\x26\xbd\xc6\x54\xe3\xa1\xc0\xfd\xe2\xb6\x77\xa6\x5b" "\xb6\x43\xb1\xea\x53\xdc\xc8\xb1\xf5\x79\xf7\x49\xbc\xbf\xb7\xbb\xb4\x7f" "\xc5\x52\x56\xe8\x3f\x06\xdf\xd3\xb0\x0f\x2f\x75\x4b\x97\x34\x7f\xff\xd1" "\xe3\xdb\x85\x30\x6c\xde\xb3\x1b\x37\x43\x7b\xb9\xba\x8d\xf6\x9e\xbb\x73" "\x7e\x23\x6c\x4e\x3d\x97\x3a\x93\x0e\xcb\x86\xb6\x93\x3d\x25\x45\x4e\xcf" "\xc1\xad\x41\x69\x92\x81\x2d\x1f\xe8\x09\xed\xfd\xa3\x4f\x92\xed\x58\xc9" "\x1e\xdb\xcb\xc6\x5e\x2f\x7b\x1f\x38\x04\xed\x9e\xdf\x46\xfd\xc3\xc1\x5c" "\x48\xad\x69\x43\x2a\xe9\x67\x14\x45\x13\xac\xce\x8e\xef\x18\xdd\x49\xf9" "\xdd\x9a\x30\x39\x49\xa3\xe7\x1d\x09\x72\x62\xe7\x5d\x26\x5e\xff\x25\xeb" "\x95\x62\x3c\xd9\xb3\x1f\x95\xbe\xf3\xf4\x11\x1f\x04\xf8\x33\x46\x76\x8e" "\xdd\x5e\xc1\x25\x79\xa3\x78\x46\x2e\xe9\x9f\x7d\xad\xe0\x66\xb3\x57\x70" "\xbd\x6b\xae\x9e\x35\xa3\x5b\x73\x9d\x3e\x2b\x9d\x19\xbd\xc4\x8a\x8f\xf3" "\x0f\x61\xea\xfa\xa4\x1b\x3c\xff\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x38\x6a\x26\xf1\xff\x25\xf2\xae\x23\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x47\x5d\xfb\xfd\xbf" "\x6a\xbd\xff\x57\xa3\xbd\xff\xb7\xfb\x55\x2c\x85\xf8\x4f\x82\x1f\xc8\xfb" "\x7f\x77\x36\xc4\xfb\x7f\x81\xf1\xfb\x15\x00\x00\xff\xff\x64\x22\x77" "\x96", 756); syz_mount_image( /*fs=*/0x20000480, /*dir=*/0x20000280, /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_NODIRATIME|MS_MANDLOCK|MS_DIRSYNC*/ 0x30008c0, /*opts=*/0x20000040, /*chdir=*/0x11, /*size=*/0x2f4, /*img=*/0x200004c0); memcpy((void*)0x20000000, "cpu.stat\000", 9); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000000ul, /*flags=*/0x275aul, /*mode=*/0ul); if (res != -1) r[0] = res; memcpy((void*)0x200001c0, "#! ", 3); *(uint8_t*)0x200001c3 = 0xa; syscall(__NR_write, /*fd=*/r[0], /*data=*/0x200001c0ul, /*len=*/0x208e24bul); syscall(__NR_mknod, /*file=*/0ul, /*mode=*/0ul, /*dev=*/0); return 0; }