// https://syzkaller.appspot.com/bug?id=125e37869f3235329ffa40896973ab4a5762a40c // 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 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"); } else if (strncmp(fs, "gfs2", 4) == 0 && (strstr(opts, "errors=panic") || strstr(opts, "debug"))) { strcat(opts, ",errors=withdraw"); } 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)) { } // syz_mount_image$ext4 arguments: [ // fs: ptr[in, buffer] { // buffer: {65 78 74 34 00} (length 0x5) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // flags: mount_flags = 0x8000 (8 bytes) // opts: ptr[in, fs_options[ext4_options]] { // fs_options[ext4_options] { // elems: array[fs_opt_elem[ext4_options]] { // fs_opt_elem[ext4_options] { // elem: union ext4_options { // resuid: fs_opt["resuid", fmt[hex, uid]] { // name: buffer: {72 65 73 75 69 64} (length 0x6) // eq: const = 0x3d (1 bytes) // val: uid (resource) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // nodelalloc: buffer: {6e 6f 64 65 6c 61 6c 6c 6f 63} (length // 0xa) // } // comma: const = 0x2c (1 bytes) // } // } // common: array[fs_opt_elem[fs_options_common]] { // } // null: const = 0x0 (1 bytes) // } // } // chdir: int8 = 0x1 (1 bytes) // size: len = 0x519 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x519) // } // ] // returns fd_dir memcpy((void*)0x20000340, "ext4\000", 5); memcpy((void*)0x20000980, "./file0\000", 8); memcpy((void*)0x20000180, "resuid", 6); *(uint8_t*)0x20000186 = 0x3d; sprintf((char*)0x20000187, "0x%016llx", (long long)0); *(uint8_t*)0x20000199 = 0x2c; memcpy((void*)0x2000019a, "nodelalloc", 10); *(uint8_t*)0x200001a4 = 0x2c; *(uint8_t*)0x200001a5 = 0; memcpy( (void*)0x200009c0, "\x78\x9c\xec\xdd\xc1\x6f\x23\x57\x19\x00\xf0\x6f\x26\xf1\x36\xbb\x9b\x62" 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"\xf6\xde\xfe\xdd\x66\x6b\x77\xab\x73\x77\xe3\x81\x47\x60\x03\x00\x00\x00" "\x17\xe8\xb1\x8f\xbe\xf1\xab\x24\x22\x0e\x3e\x7d\x3d\x2f\x51\xdc\x07\x10" "\xe0\x01\xbf\x1f\x77\x02\xc0\x59\x9a\x1a\x77\x02\xc0\xd8\xb8\x8b\x37\x4c" "\xae\x52\xbf\x72\x6d\xbc\x79\x00\xe3\x93\x9c\x30\xdf\xc5\x3b\x00\x00\xf0" "\xf0\x9b\xfb\xf0\xd1\xdf\xff\xfb\xa7\x02\x4a\x63\xcd\x0c\x38\x6f\xae\xf5" "\x01\x80\xc9\xe3\xf7\x7f\x98\x5c\x25\x57\x00\xc2\x44\x4b\x23\xe2\x7d\xbd" "\xea\x23\xa3\x96\x19\xf9\xfb\xff\x2f\x4e\x1b\x25\xcb\x22\xde\x2c\x1f\x9e" "\xe2\xfc\x22\x00\x00\x5c\xac\xd9\xbc\x24\x69\xb5\x38\x0e\x98\x8d\x34\xad" "\x56\x23\x1e\x8d\x48\x2b\x51\x4a\xd6\x36\x1a\xf5\xf9\xe2\xf8\xe0\x97\xe5" "\xd2\x23\xdd\xf6\x42\xfe\xce\xe4\xc4\x6b\x86\x01\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\x9e\x2c\x4b\x22\x03" "\x00\x00\x00\xae\xb4\x88\xf4\x8f\x49\x7e\x37\xff\x88\xb9\xf2\x33\xb3\x83" "\xe7\x07\xae\x25\xff\x28\xc7\x1f\x8a\xc6\x0f\xee\x7c\xef\xde\x72\xa7\xb3" "\xb3\xd0\x9d\xfe\xd7\xfc\x59\x5e\xd7\x22\xa2\xf3\xfd\x3b\xa5\x7c\xfa\x73" "\x23\x1f\x1f\x06\x00\x00\x00\x9c\xb5\xe4\x60\xe4\xac\xde\x71\x7a\xf1\xba" "\x70\xa1\x59\x01\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\x30\x01\xde\xbe\xff\xea\x4a\xbf\x5c\x64\xdc\x3f\x7f\x3e" "\x22\x2a\xc3\xe2\x4f\xc7\x4c\xfe\x3a\x13\xa5\x88\xb8\xf1\xb7\x24\xa6\x0f" "\xbd\x2f\x89\x88\xa9\x33\x88\x7f\xf0\x5a\x44\x3c\x3e\x2c\x7e\x12\xef\x64" "\x59\x56\x29\xb2\x18\x16\xff\xfa\x39\xc7\xaf\xe4\x9b\x66\x78\xfc\x34\x22" "\x6e\x9e\x41\x7c\x98\x64\x6f\x74\xc7\x9f\x97\x86\x7d\xfe\xd2\x78\x2a\x7f" "\x1d\xfe\xf9\x9b\x2e\xca\x7b\x35\x7a\xfc\x4b\x8b\xc8\x8f\xe7\xe3\xdc\xb0" "\xf1\xe7\xd1\x23\x6b\x6b\x0e\x8d\xf1\xc4\x5b\x3f\xa9\x8d\x8c\xff\x5a\xc4" "\x13\xd3\xc3\xc7\x9f\xfe\xf8\x9b\x8c\x88\xff\xf4\x91\xb5\xfd\x33\xcb\xb2" "\xa3\x31\xbe\xf6\xd5\xfd\xfd\x51\xf1\xb3\x1f\x46\xcc\x0d\xfd\xfe\x49\x1e" "\x88\x55\xeb\x34\xb7\x6b\xed\xbd\xfd\xdb\x1b\xcd\xe5\xf5\xfa\x7a\x7d\x6b" "\x71\x71\xe1\x85\xa5\x17\x97\x9e\x5f\x9a\xaf\xad\x6d\x34\xea\xc5\xbf\x43" "\x63\x7c\xe7\x23\x3f\x7d\xe7\xb8\xfe\xdf\x18\x12\xff\x37\xbf\xee\x8d\xbf" "\xc7\xf5\xff\x99\x51\x2b\x1d\xf0\xef\xb7\xee\xdd\xff\x40\xaf\x5a\x1a\x16" "\xff\xd6\xd3\x43\xbf\x7f\x67\x62\x44\xfc\xb4\xf8\xee\xfb\x78\x51\xef\xce" "\x9f\xeb\xd7\x0f\x7a\xf5\xc3\x9e\xfc\xf1\x9b\x4f\x1e\xd7\xff\xd5\x11\xdb" "\xff\xa4\xbf\xff\xad\x53\xf6\xff\xd9\x2f\x7f\xfb\x77\xa7\x5c\x14\x00\xb8" "\x00\xed\xbd\xfd\xcd\xe5\x46\xa3\xbe\x73\x4c\x65\xe6\x14\xcb\x3c\x8c\x95" "\x9f\xcd\x5c\x8a\x34\xfe\xc7\x4a\xf6\xad\xde\x5f\xee\xb2\xe4\xf3\xff\x56" "\xba\x7b\xab\xff\x9d\xd2\xef\xd5\x25\x48\xec\x50\x25\xbb\xb0\x58\x53\x71" "\x49\xba\xfc\x6e\x65\xac\xc3\x12\x00\x00\x70\x0e\x7e\xfe\xee\x4e\xff\xb8" "\x33\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x80\xc9" "\x75\x11\xb7\x13\x1b\x8c\x79\x30\x9e\xae\x02\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\x1c\xeb\x3f" "\x01\x00\x00\xff\xff\x46\x07\xdf\xd3", 1305); syz_mount_image(/*fs=*/0x20000340, /*dir=*/0x20000980, /*flags=MS_SILENT*/ 0x8000, /*opts=*/0x20000180, /*chdir=*/1, /*size=*/0x519, /*img=*/0x200009c0); return 0; }