// https://syzkaller.appspot.com/bug?id=859a55ecb585dfa32c48d6ce10e757c58937dc9c // 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 #ifndef __NR_openat #define __NR_openat 56 #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=*/(intptr_t)-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=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x20000140, "hfs\000", 4); memcpy((void*)0x200008c0, "./" "file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\000", 257); memcpy( (void*)0x20000c80, "\x78\x9c\xec\xdd\x4d\x6b\x13\x41\x1c\xc7\xf1\xdf\xec\xa6\x69\x6a\x6b\x5d" "\x6d\xa5\x20\x1e\xa4\x5a\xf4\x24\x6d\xbd\x88\x97\x82\x14\x5f\x83\x17\x45" "\x6d\x52\x28\x86\x16\xb5\x82\x4f\x60\xf1\x2c\xbe\x00\xef\x45\xf0\x05\xf8" "\x22\x3c\x89\xe0\x59\x4f\x9e\x7c\x01\xbd\xad\xcc\x66\x92\xcc\x36\xbb\x49" "\x9b\x9a\x6c\x82\xdf\x0f\x44\x27\xd9\x79\xf8\xcf\x66\xb3\x3b\xff\x40\xba" "\x02\xf0\xdf\xba\xbd\xfe\x73\xff\xc6\x6f\xfb\x30\x52\xa8\x50\xd2\x2d\x29" "\xb0\x9b\x2e\xa9\x24\xe9\xbc\x16\x2a\xcf\xb7\x77\xb7\x76\xeb\xb5\x6a\xb7" "\x8e\x42\xa9\xa2\xe4\x61\xa4\xa4\xa5\xe9\xa8\xb3\xb1\x5d\xcb\x6a\x6a\xdb" "\x25\x2d\x9c\xc8\x3e\x2b\x69\xc6\x7f\x0d\x83\x11\xc7\x71\xfc\xab\xe8\x20" "\x50\xa4\x8a\xfb\x3f\xcc\xda\x18\x48\x93\xee\xd3\x19\xfa\x95\xc7\xd9\x5e" "\x28\xed\x15\x1d\x44\xc1\xcc\x81\x0e\xf4\x42\xb3\x45\xc7\x01\x00\x28\x96" "\x69\x5c\xdf\x03\x77\x9d\x9f\x71\xeb\xf7\x20\x90\x96\xdc\x65\xdf\xbf\xfe" "\xff\x38\x5d\x70\xbc\x27\x73\x55\x07\x45\x87\x50\x30\xef\xfa\x9f\x64\x59" "\xb1\xb1\xef\xef\x99\x64\x53\x3b\xdf\x4b\x52\x38\xbb\x3d\x68\x66\x89\xc7" "\x1d\xc7\x2e\x1e\xcb\x6a\x1c\x59\xa9\x05\xa6\x49\x67\x95\x9d\xc9\x62\x12" "\x4b\x30\xb5\xb9\x55\xaf\x5d\xdf\xd8\xa9\x57\x03\xbd\xd3\x9a\xe3\x55\x9b" "\x97\xb4\xa6\xaa\xcb\x59\x9d\x1e\xd1\x2e\x66\x0c\x97\x56\xd6\xd1\x7b\x6b" "\xfa\xf4\x66\x61\xf3\xd0\x4b\xd3\xc9\x1c\x26\xec\x1c\x56\x73\xe2\x9f\xcb" "\x1a\xb4\xdf\xbd\x7d\x14\xe6\xab\xf9\x66\xee\x9b\x48\x1f\x55\x6d\xad\xff" "\x4a\x71\x7b\x8f\x44\xad\x77\xea\xce\x44\x3b\xfe\xe5\xbc\xee\x76\x9e\xdc" "\x4b\x5a\x35\x6a\xe5\xcc\xf2\x6c\x32\xc8\x85\xf4\x8e\xed\x3a\xcb\x30\x2f" "\x23\x91\xdb\x53\x71\xa8\xf4\x17\x04\x51\x3a\xce\x72\x66\xab\xb2\x0e\xb5" "\x6a\xcc\x6e\x25\x6f\x24\xd7\xcf\x5c\x66\xab\xd5\x1e\xad\xe6\x6d\xab\xcf" "\x5e\xab\xf6\xd1\x9c\xdf\x72\xd0\xcc\x07\x73\xd7\x2c\xea\x8f\xbe\x68\xdd" "\x5b\xff\x07\x76\x6f\x2f\xa9\xf3\x93\x99\xdd\x49\x52\xd3\x1d\x19\xcd\xf9" "\x64\xe6\x86\xa5\xa4\x66\xe4\xbf\xb4\x77\x31\xb3\xcf\xa0\xbf\xf9\x20\xcd" "\x3f\x4e\x73\x3f\x40\xd2\x7b\x3d\xd2\x4d\xcd\x3e\x7b\xf9\xea\xf1\xc3\x7a" "\xbd\xf6\xb4\xb3\x50\xca\xdf\xf4\x0f\x0a\x36\x86\xc1\xf4\x3c\x7a\x85\xd7" "\xe5\x91\x08\xa3\x5d\x68\x1e\x04\xa3\x12\x4f\x7f\x05\x7b\x8e\x1d\xee\x41" "\xdb\x2a\x94\x4f\xbc\xeb\x2a\x3a\x56\xe5\xce\x99\xfa\x85\xe6\xa9\xf3\x08" "\x1d\x36\x4f\xd2\x3d\x07\x1d\xcc\xd9\x09\xa3\xa5\xfd\xa6\xe7\xd7\x79\x3b" "\xcc\x80\x30\x6c\xf6\xe4\x61\x1a\xf9\x9f\x97\xaf\x2c\x27\x09\x81\xfd\x27" "\xea\xb2\x4e\x8f\x7b\x2d\xdb\xbc\x1e\x57\x32\x72\x83\xc9\x56\xc5\x53\x5e" "\x4f\xc6\x7d\x3f\x9f\x9f\x01\x4d\xe7\x67\x70\xdd\x72\xae\x7d\xaf\xde\xe5" "\x6b\xd2\x15\xef\x79\x8f\x9c\x2b\xd2\x39\x69\xaa\xeb\x5c\xc7\x89\x59\xd7" "\x77\x3d\xe0\xfb\x7f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x80\x71\x33\x8c\x5f\x6b\x78\xc3\xf1\x17\x7d\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe8\x43\xfe\xfd\x7f\x2b\x1a" "\xe0\xfd\x7f\x53\xbf\x03\x38\xc1\xfd\x7f\xbb\xdc\xe0\x04\x40\x2f\x7f\x03" "\x00\x00\xff\xff\x41\x15\x75\x6a", 710); syz_mount_image( /*fs=*/0x20000140, /*dir=*/0x200008c0, /*flags=MS_LAZYTIME|MS_I_VERSION|MS_POSIXACL|MS_NODIRATIME|MS_DIRSYNC*/ 0x2810880, /*opts=*/0x20000000, /*chdir=*/1, /*size=*/0x2c6, /*img=*/0x20000c80); memcpy((void*)0x20000300, "blkio.bfq.io_merged_recursive\000", 30); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000300ul, /*flags=*/0x275a, /*mode=*/0); return 0; }