// 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*)0x200001c0, "hfs\000", 4); memcpy((void*)0x20000080, "./file1\000", 8); memcpy( (void*)0x20000200, "\x78\x9c\xec\xdd\xcf\x6a\xd4\x5c\x18\xc7\xf1\xdf\xc9\xe4\xed\x9b\x6a\xa9" "\xe9\x1f\x29\x88\x20\x54\x0b\xae\xa4\xad\x1b\x71\xa3\x48\xb7\xee\x5d\x89" "\xda\x19\xa1\x74\xa8\xa0\x15\xd4\x55\x75\x2d\x5e\x80\x7b\x6f\xc1\x8b\x70" "\x25\xde\x40\x5d\xb9\xf2\x02\x0a\x82\x91\x73\x92\x74\x32\x6d\x32\x99\xb4" "\x33\x49\x47\xbf\x1f\xd0\xc9\x4c\xcf\x73\xce\x73\x26\x67\x9a\xf3\x0c\x94" "\x08\xc0\x3f\xeb\xde\xc6\xfe\xa7\x9b\x3f\xec\x3f\x23\xb5\xd4\x92\x74\x5b" "\xf2\x24\x05\x92\x2f\xe9\xa2\x96\x82\x97\x3b\xbb\x5b\xbb\xdd\x4e\x7b\x50" "\x47\x2d\x17\x61\x43\x4c\xfc\xe0\x1e\xfb\x6d\xee\x74\xf2\x42\x6d\x9c\x8b" "\xb0\xee\x4a\xa1\x7d\xe6\x6b\xe6\xf0\x35\x8c\x4d\x10\x45\xd1\xf7\xa6\x93" "\x40\xe3\xdc\xa7\x3f\x87\x27\xfd\x1f\x45\xbd\xe7\x41\x8d\x39\x8d\xd3\x5e" "\xd3\x09\x34\xcc\x1c\xe8\x40\xaf\x34\xdb\x74\x1e\x00\x80\x66\x25\xd7\x7f" "\x2f\xde\xc9\x6b\x26\xd9\xbf\x7b\x9e\xb4\x92\x5c\xf6\xdd\xfe\xe0\x6f\xb9" "\xfe\x1f\x34\x9d\x40\xc3\x32\xd7\x7f\x5f\xda\x57\x64\xec\xf9\xbd\xe0\x7e" "\xd4\xab\xf7\x5c\x09\x67\xab\x30\x2f\xad\x12\x4f\x32\xd6\x94\xe2\x95\xd5" "\xb7\xc1\x34\x65\x55\xa5\xcb\xc5\x9b\x7e\xba\xd5\xed\xdc\xd8\x7c\xd6\x6d" "\x7b\x7a\xa7\x3b\x89\x4c\xb3\x45\x2d\x4b\x6a\xc7\x4b\x37\x95\xcd\xf6\xed" "\xf1\xae\x97\x73\x6a\xd3\xe3\x5a\x79\xbd\x55\x73\xde\xcd\xe1\x3f\x3b\x87" "\xf5\x82\xfc\x17\xf2\xe2\x4e\xf3\x6e\x97\x31\x5f\xcc\x57\xf3\xd0\x84\xfa" "\xa8\xf6\xe1\xfe\xcf\x8f\x8c\x3d\x4d\xee\x4c\x85\x47\xce\x54\x9c\xff\x6a" "\x71\x8f\x6e\x96\x61\xdc\xaa\x60\x96\x73\x6e\x90\x4b\xc9\x08\x89\x92\x59" "\x06\xf9\x15\x89\xd2\x15\x35\xa7\xfe\x2f\x08\xc2\xb2\x3c\x5d\xd4\xfc\x91" "\xa8\x78\x76\x6b\x25\x51\x0b\xb9\x51\xeb\x25\x51\x8b\x47\xa3\x7a\xab\xb9" "\x38\x72\xdc\xcc\x07\xf3\xc0\x2c\xeb\xa7\x3e\x6b\x23\xb3\xff\xf7\xec\xbb" "\xbd\xa2\x61\x3e\x99\xb6\x8d\x6b\x99\xac\x8c\x81\xf3\xf1\x5d\xcb\x50\xd2" "\xef\x28\xa6\xbd\xcb\xb9\x2d\xbd\x53\x4c\x0a\x55\xbd\xd7\x13\xdd\xd2\xec" "\x8b\xd7\x6f\xb6\x1f\x77\xbb\x9d\xc8\x48\x7b\xf6\xe0\x79\xfa\x8a\x91\xd1" "\x76\xdf\x2b\x15\x0e\xae\x0c\x68\x63\x47\xaf\xdc\x61\xfe\x81\x7f\xf2\x0c" "\xcf\xfe\x81\xaf\xb1\x0d\x91\x2e\x82\x33\x32\xd3\x3a\x0e\xa6\x47\xb7\xea" "\x6a\x39\x58\x6a\x49\xd5\xa3\xec\xfe\x7c\x44\x69\x34\xfa\xdb\x09\x35\xe9" "\x9d\xf4\x61\x23\xee\x8f\x37\x21\xd4\xcd\xee\xbb\x4c\x5c\xff\x65\xea\x95" "\x55\x57\x22\xd9\xff\xc2\x01\xfb\xf4\xa8\xac\xf3\x4c\x8f\x6b\x05\xb5\xc1" "\xbc\xeb\xe7\x5c\x71\x05\x97\x11\x1c\x76\x5b\x58\xc1\x0d\x5b\x73\x5d\xbd" "\x2e\x5d\x2b\x1f\x31\x15\xba\x3c\x35\x5d\x36\xe1\x09\x61\x36\xf4\x4d\x8f" "\xf8\xfe\x1f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x60" "\xd2\xd4\xf1\xc7\x0c\x4d\xcf\x11\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x80\x49\xf7\x2b\xb9\x29\xcb\xa8\xee\xff\x1b\x9c" "\xf6\xfe\xbf\x1a\xe6\xfe\xbf\x53\xd5\x26\x09\x20\xd7\x9f\x00\x00\x00\xff" "\xff\x7f\x8b\x83\x62", 671); syz_mount_image(/*fs=*/0x200001c0, /*dir=*/0x20000080, /*flags=MS_POSIXACL|MS_REC*/ 0x14000, /*opts=*/0x20000040, /*chdir=*/4, /*size=*/0x29f, /*img=*/0x20000200); memcpy((void*)0x20000000, "./file2\000", 8); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000000ul, /*flags=O_TRUNC|O_SYNC|O_NONBLOCK|O_NOATIME|O_DIRECT|O_CREAT|0x2*/ 0x145a42ul, /*mode=*/0ul); memcpy((void*)0x20000080, "memory.current\000", 15); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000080ul, /*flags=*/0x275aul, /*mode=*/0ul); if (res != -1) r[0] = res; syscall(__NR_write, /*fd=*/r[0], /*data=*/0x200004c0ul, /*len=*/0x208e24bul); return 0; }