// https://syzkaller.appspot.com/bug?id=67dbafe7987e8ed784ca4d29a2465ee9ae18d2f1 // 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 #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, 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 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, loopfd = -1, 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) { memset(loopname, 0, sizeof(loopname)); snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); if (setup_loop_device(data, size, loopname, &loopfd) == -1) return -1; 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) { if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0) 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) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } errno = err; return res; } int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); memcpy((void*)0x200000c0, "ext3\000", 5); memcpy((void*)0x20000480, "./file1\000", 8); memcpy((void*)0x20000000, "debug_want_extra_isize", 22); *(uint8_t*)0x20000016 = 0x3d; sprintf((char*)0x20000017, "0x%016llx", (long long)0x80); *(uint8_t*)0x20000029 = 0x2c; memcpy((void*)0x2000002a, "quota", 5); *(uint8_t*)0x2000002f = 0x2c; memcpy((void*)0x20000030, "auto_da_alloc", 13); *(uint8_t*)0x2000003d = 0x3d; sprintf((char*)0x2000003e, "0x%016llx", (long long)0x800); *(uint8_t*)0x20000050 = 0x2c; memcpy((void*)0x20000051, "max_batch_time", 14); *(uint8_t*)0x2000005f = 0x3d; sprintf((char*)0x20000060, "0x%016llx", (long long)8); *(uint8_t*)0x20000072 = 0x2c; memcpy((void*)0x20000073, "noload", 6); *(uint8_t*)0x20000079 = 0x2c; memcpy((void*)0x2000007a, "usrjquota=", 10); *(uint8_t*)0x20000084 = 0x2c; *(uint8_t*)0x20000085 = 0; memcpy( (void*)0x200004c0, "\x78\x9c\xec\xdc\xcb\x6f\x1b\x45\x18\x00\xf0\x6f\xed\x24\x7d\x93\x50\xca" "\xa3\xa5\x85\x40\x41\x44\x3c\x92\x26\x7d\xd0\x03\x17\x10\x48\x1c\x40\x42" "\x82\x43\x11\xa7\x90\xa4\x55\xa8\xdb\xa0\x26\x48\xb4\x8a\x20\x70\x08\x47" "\x54\x89\x3b\xe2\x88\xc4\x5f\xc0\x09\x2e\x08\x38\x21\x71\x85\x3b\xaa\x54" "\xa1\x5c\x5a\x38\x19\xad\xbd\x9b\xba\x89\x9d\xc6\x89\x53\x97\xec\xef\x27" "\x6d\x3b\xe3\x1d\x6b\xe6\xdb\xdd\xb1\x67\x67\xbc\x09\xa0\xb0\x06\xd3\x7f" "\x92\x88\xbd\x11\xf1\x47\x44\xf4\xd7\xb3\xb7\x17\x18\xac\xff\x77\x73\x69" "\x7e\xe2\x9f\xa5\xf9\x89\x24\xaa\xd5\xb7\xff\x4e\x6a\xe5\x6e\x2c\xcd\x4f" "\xe4\x45\xf3\xf7\xed\xa9\x67\xaa\xd5\x2c\xbf\xa3\x49\xbd\x8b\xef\x45\x8c" "\x57\x2a\x53\x97\xb2\xfc\xc8\xdc\x85\x0f\x47\x66\x2f\x5f\x79\x61\xfa\xc2" "\xf8\xb9\xa9\x73\x53\x17\xc7\x4e\x9f\x3e\x71\xfc\x48\xdf\xa9\xb1\x93\x1d" "\x89\x33\x8d\xeb\xc6\xa1\x4f\x66\x0e\x1f\x7c\xfd\xdd\xab\x6f\x4e\x9c\xb9" "\xfa\xfe\x2f\xdf\xa5\xed\xdd\x9b\xed\x6f\x8c\xa3\x53\x06\xeb\x47\xb7\xa9" "\xa7\x3b\x5d\x59\x97\xed\x6b\x48\x27\x3d\x5d\x6c\x08\x6d\x29\x47\x44\x7a" "\xba\x7a\x6b\xfd\xbf\x3f\xca\xb1\x6b\x79\x5f\x7f\xbc\xf6\x79\x57\x1b\x07" "\x6c\xa9\x6a\xb5\x5a\x6d\xf6\xfd\x9c\x59\xa8\x02\xdb\x58\x12\xdd\x6e\x01" "\xd0\x1d\xf9\x17\x7d\x7a\xff\x9b\x6f\x77\x69\xe8\x71\x4f\xb8\xfe\x72\xfd" "\x06\x28\x8d\xfb\x66\xb6\xd5\xf7\xf4\x44\x29\x2b\xd3\xbb\xe2\xfe\xb6\x93" "\x06\x23\xe2\xcc\xc2\xbf\x5f\xa7\x5b\x6c\xd1\x3c\x04\x00\x40\xa3\x1f\xd2" "\xf1\xcf\xf3\xcd\xc6\x7f\xa5\x78\xa8\xa1\xdc\x7d\xd9\x1a\xca\x40\x44\xdc" "\x1f\x11\xfb\x23\xe2\x81\x88\x38\x10\x11\x0f\x46\xd4\xca\x3e\x1c\x11\x8f" "\xb4\x59\xff\xca\x15\x92\xd5\xe3\x9f\xd2\xb5\x0d\x05\xb6\x4e\xe9\xf8\xef" "\xa5\x6c\x6d\xeb\xf6\xf1\x5f\x3e\xfa\x8b\x81\x72\x96\xdb\x57\x8b\xbf\x37" "\x39\x3b\x5d\x99\x3a\x96\x1d\x93\xa1\xe8\xdd\x91\xe6\x47\xd7\xa8\xe3\xc7" "\x57\x7f\xff\xb2\xd5\xbe\xc6\xf1\x5f\xba\xa5\xf5\xe7\x63\xc1\xac\x1d\xd7" "\x7a\x56\x4c\xd0\x4d\x8e\xcf\x8d\x6f\x26\xe6\x46\xd7\x3f\x8b\x38\xd4\xd3" "\x2c\xfe\x24\xf2\x65\x9c\x24\x22\x0e\x46\xc4\xa1\x0d\xd6\x31\xfd\xec\xb7" "\x87\x5b\xed\xbb\x73\xfc\x6b\xe8\xc0\x3a\x53\xf5\x9b\x88\x67\xea\xe7\x7f" "\x21\x56\xc4\x9f\x4b\x5a\xae\x4f\x8e\xbe\x78\x6a\xec\xe4\xc8\xce\xa8\x4c" "\x1d\x1b\xc9\xaf\x8a\xd5\x7e\xfd\x6d\xf1\xad\x56\xf5\x6f\x2a\xfe\x0e\x48" "\xcf\xff\xee\xa6\xd7\xff\x72\xfc\x03\xc9\xce\x88\xd9\xcb\x57\xce\xd7\xd6" "\x6b\x67\xdb\xaf\x63\xf1\xcf\x2f\x5a\xde\xd3\x6c\xf4\xfa\xef\x4b\xde\xa9" "\xa5\xfb\xb2\xd7\x3e\x1e\x9f\x9b\xbb\x34\x1a\xd1\x97\xbc\xb1\xfa\xf5\xb1" "\x5b\xef\xcd\xf3\x79\xf9\x34\xfe\xa1\xa3\xcd\xfb\xff\xfe\xb8\x75\x24\x1e" "\x8d\x88\xf4\x22\x3e\x12\x11\x8f\x45\xc4\xe3\x59\xdb\x9f\x88\x88\x27\x23" "\xe2\xe8\x1a\xf1\xff\xfc\xca\x53\x1f\xb4\x1f\xff\x1a\xb3\xf2\x1d\x94\xc6" "\x3f\x79\xa7\xf3\x1f\x8d\xe7\xbf\xfd\x44\xf9\xfc\x4f\xdf\xb7\x1f\x7f\x2e" "\x3d\xff\x27\x6a\xa9\xa1\xec\x95\xf5\x7c\xfe\xad\xb7\x81\x9b\x39\x76\x00" "\x00\x00\xf0\x7f\x51\xaa\xfd\x06\x3e\x29\x0d\x2f\xa7\x4b\xa5\xe1\xe1\xfa" "\x6f\xf8\x0f\xc4\xee\x52\x65\x66\x76\xee\xb9\xb3\x33\x1f\x5d\x9c\xac\xff" "\x56\x7e\x20\x7a\x4b\xf9\x4c\x57\x7f\xc3\x7c\xe8\x68\x36\x37\x9c\xe7\xc7" "\x56\xe4\x8f\x67\xf3\xc6\x5f\x95\x77\xd5\xf2\xc3\x13\x33\x95\xc9\x6e\x07" "\x0f\x05\xb7\xa7\x45\xff\x4f\xfd\x55\xee\x76\xeb\x80\x2d\xe7\x79\x2d\x28" "\x2e\xfd\x1f\x8a\x4b\xff\x87\xe2\xd2\xff\xa1\xb8\xf4\x7f\x28\xae\x66\xfd" "\xff\xd3\x2e\xb4\x03\xb8\xfb\x7c\xff\x43\x71\xe9\xff\x50\x5c\xfa\x3f\x14" "\x97\xfe\x0f\x85\xd4\xf2\xd9\xf8\xd2\xa6\x1e\xf9\x97\xd8\xf6\x89\x28\xdd" "\x13\xcd\xd8\xfe\x89\x9e\x75\xff\x31\x8b\x0d\x26\x76\x34\xdd\xd5\xed\x4f" "\x26\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\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\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\x80\xce\xf8\x2f\x00\x00" "\xff\xff\x70\x88\xe4\x87", 1086); syz_mount_image(0x200000c0, 0x20000480, 0xc0ed0006, 0x20000000, 0xfe, 0x43e, 0x200004c0); memcpy((void*)0x200001c0, "cgroup.controllers\000", 19); syscall(__NR_openat, 0xffffff9c, 0x200001c0ul, 0x275aul, 0ul); return 0; }