// https://syzkaller.appspot.com/bug?id=2dc0a7760777197118e32b794d1146a7d84b894a // 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 #ifndef __NR_write #define __NR_write 64 #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) { 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) { ioctl(loopfd, LOOP_CLR_FD, 0); close(loopfd); } errno = err; return res; } uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); intptr_t res = 0; memcpy((void*)0x20000100, "hfs\000", 4); memcpy((void*)0x20000000, "./bus\000", 6); memcpy( (void*)0x200006c0, "\x78\x9c\xec\xdd\x4d\x6b\x13\x41\x1c\xc7\xf1\xdf\xec\x26\x9b\xf4\x81\x1a" "\xdb\x4a\xc1\x83\x48\x55\xf0\x24\x6d\xbd\x88\x17\x45\xfa\x22\x3c\x88\xa8" "\x4d\x84\x62\xa8\x60\x2b\xa8\x17\xc5\xb3\x88\x37\xc1\xa3\xe0\x45\x3c\x8b" "\xaf\xc1\x93\x78\xf5\x60\x4f\x9e\x7c\x01\xbd\xad\xcc\xec\x6c\xb3\x79\xde" "\xa4\x36\x6b\xeb\xf7\x03\x49\xb7\xbb\xf3\xf0\x9f\x4c\x36\xb3\xff\xd0\xb2" "\x02\xf0\xdf\xba\xb1\xfe\xf3\xc3\xe5\x5f\xf6\x61\xa4\x50\x61\x1c\xc7\xb1" "\x14\x48\xaa\x4a\x25\x49\xa7\xb4\x54\x7d\xbc\xb5\xb3\xb9\xd3\x6c\xd4\x07" "\x35\x14\xda\x1a\x9b\x67\xcf\x48\x46\x49\x4d\xd3\x55\x66\x63\xab\xd1\xab" "\x6a\x55\xbe\x86\x57\xb3\xbf\x95\x34\x9b\xdd\x87\xc3\x61\xe7\x7b\x37\xd9" "\x2c\x17\x1d\x0b\x8a\xe3\xce\x7e\x45\x5d\xfb\x03\xa9\xe2\xcf\xce\x50\xe9" "\xb9\x7a\x84\x5c\xef\xda\x13\x14\x12\xc7\xbf\xc6\xec\x69\xaf\xe8\x18\x00" "\x00\xc5\xf2\x17\xeb\xa1\x49\x16\x47\xbb\xce\xcf\xfa\xeb\xf7\x20\x90\x2e" "\x24\xcb\xfe\x8b\xa2\xc3\xfc\xab\x8e\xdb\xe2\x37\xea\x55\x8d\x5b\xff\x9f" "\x68\x2e\xcd\xbc\x62\x63\xe7\xfd\x84\x3b\xd4\xca\xf7\x5c\x0a\x67\x8f\x07" "\x69\x96\x28\xc5\xcf\x47\x8d\x2d\xf2\x01\x86\x6d\x01\x0c\xcb\x2a\x5d\x2c" "\xc1\xd4\xfd\xcd\x66\xe3\xd2\xc6\xc3\x66\x3d\xd0\x4b\x5d\xf3\x32\xc5\x16" "\xdd\x73\xbd\xfd\x15\x68\x45\xdb\xd3\x72\x8f\xdc\x74\x80\x21\xad\x0d\x30" "\xe3\xc6\x50\xb6\x63\x58\xeb\x13\xff\xc2\x38\x3d\xbe\x1d\x21\x86\x38\xdd" "\xf8\x31\xed\x7e\x98\xaf\xe6\x9b\xb9\x6d\x6a\x7a\xa7\xba\x9b\x7f\xab\x14" "\x1b\x3b\x4d\x6e\xa6\x6a\x1d\x33\x95\xc4\xbf\xd2\xb3\xf1\xf2\xfe\x28\x6b" "\x49\xa9\x3e\xa3\x3c\xe9\x3a\x39\x9d\x66\x18\x5f\x3e\xe5\x18\x65\xb5\x3d" "\x8c\xac\xc8\xb7\xd9\xf6\x05\x41\x2d\x8d\xf3\x4d\x77\x1a\xd3\xaa\x35\xdf" "\x51\x2b\x19\xdd\x6a\xbf\x9e\x7c\xad\x85\xfd\x5a\x51\xa6\xd6\xda\x90\x5a" "\x8b\x9d\x7d\xb5\xde\xcd\xfd\x6b\x1e\x36\xf3\xda\xdc\x34\xcb\xfa\xad\xcf" "\x5a\xdf\x9f\x7f\x7b\xfa\x84\xc9\x47\xfd\xf0\x33\xd3\x96\x71\x25\xfd\x3b" "\x63\xe0\x78\x4a\xae\x64\x2d\x47\x60\x24\x66\x93\xf4\x4a\xf7\x74\x45\x73" "\xdb\x4f\x9f\x3d\xb8\xdb\x6c\x36\x22\xf9\x8d\x47\xdb\x93\xd8\xb0\x9f\x1b" "\x13\xea\x2b\x7d\x5b\x25\x7b\xa6\x93\x43\x76\x47\x77\xe1\xa9\x89\x8c\x3d" "\xbb\x51\x56\xae\xc2\xa5\x89\xcc\x4e\xfa\x05\xe0\x01\xdb\x09\x95\xb7\x70" "\x7c\xd0\x98\xdf\xf7\x3e\x14\x8d\xd1\x60\xa4\x81\x65\xd2\x2f\xbe\xf2\x37" "\xb8\x5b\x51\xae\xc9\x8d\x34\xfa\xd8\x3f\x36\x1b\xa1\x2a\xb9\x5f\xe7\xb1" "\x36\x0a\xfa\x5c\xc2\x44\xb5\x26\x5d\x4b\xb7\x8a\x0e\x06\x45\xb0\x0b\xa4" "\x49\xf2\xbf\x4c\xbe\xb2\xe2\x52\x24\xfb\x54\x1b\x70\x9d\x1e\x0f\x6b\x3c" "\xd3\xe2\x6a\x9f\xdc\x60\xde\x3d\x4f\x8f\x94\xc1\xcd\xf4\xcf\xe0\xf2\xe6" "\x5c\xe7\x2e\x4a\xe7\xf3\xf7\x58\xf1\x71\x1e\x13\x66\x5d\xdf\x75\x27\x73" "\xfd\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x23" "\xe1\xb0\xfe\x9f\x64\xca\xb7\xef\xfe\xb2\x1c\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x1c\x48\xe7\xfd\x7f\x25\x5d\x1d" "\xff\xfe\xbf\xee\xc1\xfd\x7f\x81\x23\xe2\x4f\x00\x00\x00\xff\xff\xa3\x2b" "\x73\xe2", 704); syz_mount_image(/*fs=*/0x20000100, /*dir=*/0x20000000, /*flags=*/0, /*opts=*/0x20000040, /*chdir=*/5, /*size=*/0x2c0, /*img=*/0x200006c0); 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; syscall(__NR_write, /*fd=*/r[0], /*data=*/0x20000180ul, /*len=*/0x208e24bul); return 0; }