// https://syzkaller.appspot.com/bug?id=793bbf00f8d7045ad1568ec16986c39ba21a792a // 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; static long syz_open_procfs(volatile long a0, volatile long a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == -1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } //% 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*)0x20000280, "./file0\000", 8); syscall(__NR_mkdirat, /*fd=*/0xffffff9c, /*path=*/0x20000280ul, /*mode=*/0ul); memcpy((void*)0x200001c0, "hfs\000", 4); memcpy((void*)0x20002380, "./file0/file0\000", 14); memcpy((void*)0x20002480, "gid", 3); *(uint8_t*)0x20002483 = 0x3d; sprintf((char*)0x20002484, "0x%016llx", (long long)0); *(uint8_t*)0x20002496 = 0x2c; memcpy((void*)0x20002497, "dir_umask", 9); *(uint8_t*)0x200024a0 = 0x3d; sprintf((char*)0x200024a1, "%023llo", (long long)0xffffffffffff9075); *(uint8_t*)0x200024b8 = 0x2c; memcpy((void*)0x200024b9, "gid", 3); *(uint8_t*)0x200024bc = 0x3d; sprintf((char*)0x200024bd, "0x%016llx", (long long)0); *(uint8_t*)0x200024cf = 0x2c; memcpy((void*)0x200024d0, "codepage", 8); *(uint8_t*)0x200024d8 = 0x3d; memcpy((void*)0x200024d9, "koi8-u", 6); *(uint8_t*)0x200024df = 0x2c; memcpy((void*)0x200024e0, "part", 4); *(uint8_t*)0x200024e4 = 0x3d; sprintf((char*)0x200024e5, "0x%016llx", (long long)-1); *(uint8_t*)0x200024f7 = 0x2c; memcpy((void*)0x200024f8, "quiet", 5); *(uint8_t*)0x200024fd = 0x2c; memcpy((void*)0x200024fe, "creator", 7); *(uint8_t*)0x20002505 = 0x3d; memcpy((void*)0x20002506, "\x99\x6c\x6d\xd2", 4); *(uint8_t*)0x2000250a = 0x2c; memcpy((void*)0x2000250b, "iocharset", 9); *(uint8_t*)0x20002514 = 0x3d; memcpy((void*)0x20002515, "cp437", 5); *(uint8_t*)0x2000251a = 0x2c; *(uint8_t*)0x2000251b = 0; memcpy( (void*)0x20002900, "\x78\x9c\xec\xdd\x3f\x6b\x14\x4f\x1c\xc7\xf1\xcf\xec\x6d\xee\x92\x5f\x42" "\x7e\x9b\x3f\x12\xb0\x8c\x09\x58\x88\x24\xb1\x11\x1b\x83\xa4\xf4\x01\x58" "\x88\x18\x93\x13\x82\x47\x04\x8d\xa0\xa9\xa2\xb5\x88\x9d\x60\x6f\x67\x2d" "\x3e\x06\x2b\xf1\x09\x18\x1b\x2b\x2b\xab\x60\xb3\x32\xb3\xbb\x71\xef\x9c" "\xcd\xed\x9d\x77\x59\x63\xde\x2f\xc8\xb2\xb7\x3b\x33\xfb\xfd\x3a\xfb\x67" "\xe6\xe4\x58\x01\x38\xb5\xae\xad\x7d\x7e\x73\xe9\xab\xfd\x33\x52\x4d\x35" "\x49\x57\xa4\x40\xd2\xa8\x14\x4a\x3a\xa3\xb9\xd1\x47\xdb\x3b\x5b\xfb\xad" "\xe6\x66\x61\x2b\x63\xb6\xae\xad\x61\xff\x8c\x92\x9a\xe6\xb7\x62\x1b\xdb" "\xcd\xf6\x0d\x0d\xb7\xb4\xf5\x5c\x8d\x54\x64\x3f\x85\x9a\xc8\x6f\xc3\x70" "\xc4\x71\x1c\xef\x77\x2d\xf5\xfd\x58\x62\x41\x75\xdc\xd5\xef\x11\x24\x17" "\xa9\xbd\x12\xdd\x7e\x77\xad\xa6\xcb\x93\xc9\x78\x6e\x4c\xa7\x44\xae\x87" "\xcd\x81\x0e\xf4\x58\x93\x55\x86\x03\x00\xa8\x5e\xfa\xfc\x0f\xd2\xa7\xc4" "\x44\x3a\x7e\x0f\x02\x69\x31\x7d\xe0\xe7\x9e\xff\x27\xd6\x85\x6c\xe5\xa0" "\xda\x38\x2a\x77\xf8\xfc\x0f\x92\xcf\xb1\xb1\xfd\xfb\xbf\xdb\xe5\xe6\x7b" "\x3b\x76\xbe\x67\xb2\xee\x0e\xb2\x59\x62\x97\x66\xbd\x63\xc8\xba\x92\x33" "\xab\x6d\x67\xee\x28\x7e\x2e\x96\x60\xec\xee\x56\xab\x79\x71\xcf\x35\xf0" "\x4c\x57\x53\xb9\x62\xb3\x6e\xb9\xa9\x2c\x11\xa7\x4b\xb4\xf3\xbd\x0d\x01" "\x4b\xe6\xee\x31\xee\x72\x18\xb1\x39\xac\x14\xc4\x3f\xd3\xcf\x11\x5f\xf9" "\x37\x97\xca\xca\x7c\x30\x1f\xcd\x2d\x13\xe9\xb5\x36\x0f\xc7\x7f\x61\x6c" "\x6c\x37\xb9\x9e\x8a\x3a\x7a\x2a\x89\x7f\xa9\xb8\x45\x97\x65\x94\x94\x6a" "\xcb\xf2\xd7\xfc\x7d\xca\x1d\xe4\x6c\x7a\x04\xbd\x7f\x5b\x22\xcb\x51\xd5" "\x6c\x2c\x3e\x75\x3b\x23\x99\x52\xfb\x17\x04\x51\x16\xe7\xcb\x7a\x61\x2d" "\x69\xba\xa3\x56\x92\xdd\x72\x71\x76\xae\xd6\x8c\xb7\xd6\xca\xe1\xe7\x1f" "\xde\x5a\xb3\x9d\xb5\x92\xb3\x79\xe3\x7e\xab\xf8\xab\x94\x7e\x79\xaf\x3c" "\x1f\xf3\xc2\xdc\x30\xf3\xfa\xa6\x77\x5a\xcb\x8d\xff\x03\xdb\xc2\xa2\x8a" "\xaf\xcc\xb6\x3b\xbf\x71\x25\xd3\x33\xe3\xc8\x7c\x42\x57\xb2\xa0\x1f\xdb" "\x04\x65\x33\xc0\x00\x3c\xd7\x1d\x5d\xd6\xe4\xc3\x27\xbb\xf7\xd6\x5b\xad" "\xe6\x83\x61\xac\x7c\x51\x6e\x4b\x7d\x28\x87\x18\xf0\x8a\xa4\x05\xfb\xaf" "\xf3\xb7\xc4\x93\xae\x84\x3a\x8e\x63\x8d\xa4\xa7\xc6\x80\x5b\x6e\xf8\x77" "\xad\xfa\x6b\xd5\xb5\x6b\x63\x58\x95\x34\xcc\x94\xaf\xab\x74\x61\x79\x77" "\x65\xcf\xda\x01\xc5\x13\xf6\x5a\xab\xa6\x86\x3f\xb0\x41\xad\x54\x76\x67" "\xc2\x31\xca\xdd\xfa\xe6\x6e\x56\x1d\x0c\xaa\x60\xc7\x5d\x26\x99\xff\xe5" "\xe6\x2b\x4b\xee\x06\x67\x17\xd1\x11\xe3\xf4\x38\xb7\xee\xfd\xdf\xba\x5c" "\x8b\xcb\x1d\x33\xa0\xd5\xb4\xc8\xb4\x5b\xfe\xd7\xd3\x0c\x6e\xbc\x78\xae" "\x33\x9e\xad\x74\x99\x73\x9d\x3b\x2f\x2d\xd4\x8b\x8e\xf8\xb4\xb3\xd9\x28" "\x8d\xf3\x1f\x61\xd6\xf4\x49\xb7\xf9\xfe\x1f\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\xe0\xa4\xe9\xf5\x87\x01\x63\xeb\x61\x3f\x3f" "\xaa\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x7f\xa0\xf4\xfb\x7f\x8f\x78\x53\x93\x53\xe6\xfd\xbf\x8d\xce\xf7\xff" "\x26\xfa\x7a\xff\xaf\xd9\xeb\x21\x4b\x00\x3e\x3f\x03\x00\x00\xff\xff\x13" "\x96\x72\x89", 723); syz_mount_image(/*fs=*/0x200001c0, /*dir=*/0x20002380, /*flags=*/0x2000001, /*opts=*/0x20002480, /*chdir=*/1, /*size=*/0x2d3, /*img=*/0x20002900); memcpy((void*)0x20000300, "mounts\000", 7); res = -1; res = syz_open_procfs(/*pid=*/0, /*file=*/0x20000300); if (res != -1) r[0] = res; syscall(__NR_read, /*fd=*/r[0], /*buf=*/0x20000340ul, /*len=*/0x2020ul); return 0; }