// https://syzkaller.appspot.com/bug?id=d4a58de9696a60f9c0d79531cdc0d622e474e786 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include <endian.h> #include <errno.h> #include <fcntl.h> #include <setjmp.h> #include <stdbool.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/ioctl.h> #include <sys/mman.h> #include <sys/mount.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <unistd.h> #include <linux/loop.h> #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, 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=*/0x3ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x400000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x400001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); const char* reason; (void)reason; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x4000000007c0, "hfs\000", 4); memcpy((void*)0x400000000280, "./file1\000", 8); memcpy((void*)0x400000000800, "file_umask", 10); *(uint8_t*)0x40000000080a = 0x3d; sprintf((char*)0x40000000080b, "%023llo", (long long)0xfff); *(uint8_t*)0x400000000822 = 0x2c; memcpy((void*)0x400000000823, "dir_umask", 9); *(uint8_t*)0x40000000082c = 0x3d; sprintf((char*)0x40000000082d, "%023llo", (long long)0); *(uint8_t*)0x400000000844 = 0x2c; memcpy((void*)0x400000000845, "iocharset", 9); *(uint8_t*)0x40000000084e = 0x3d; memcpy((void*)0x40000000084f, "iso8859-6", 9); *(uint8_t*)0x400000000858 = 0x2c; memcpy((void*)0x400000000859, "codepage", 8); *(uint8_t*)0x400000000861 = 0x3d; memcpy((void*)0x400000000862, "cp1255", 6); *(uint8_t*)0x400000000868 = 0x2c; memcpy((void*)0x400000000869, "creator", 7); *(uint8_t*)0x400000000870 = 0x3d; memcpy((void*)0x400000000871, "\x4d\xdd\x71\x75", 4); *(uint8_t*)0x400000000875 = 0x2c; *(uint8_t*)0x400000000876 = 0; memcpy( (void*)0x4000000004c0, "\x78\x9c\xec\xdd\x4d\x6b\x13\x41\x1c\x06\xf0\x67\x76\xd3\x66\x6b\x4b\x5d" "\x6d\x45\xf0\x20\x52\x0d\xd8\x8b\x68\xbd\x88\x97\x48\xc9\x87\xf0\x24\x6a" "\x93\x42\x71\xa9\xa8\x2d\xbe\xe0\xa1\x8a\x27\x11\x7b\xf7\xee\xd1\xab\x9f" "\x41\xbc\x28\x82\xe7\x7a\xf2\x24\x9e\xeb\x41\x46\xe6\x25\xd9\x97\xec\x6e" "\x12\xc9\xee\x26\xfa\xfc\xa0\x61\xb3\xb3\x33\xfb\x9f\xcc\xce\xce\x4c\xa0" "\x59\x10\xd1\x7f\x6b\xbd\x75\xf0\xf6\xf2\x77\xf5\x27\x00\x17\x2e\xf0\xf2" "\x2a\xe0\x00\xf0\x80\x1a\x80\x13\x38\xe9\xed\x6e\xef\x6c\xed\x04\x9d\x76" "\x5e\x41\x2e\x4e\xd7\x4d\x2e\x01\x93\x53\xf4\x1d\xb3\xb1\xdd\x49\xcb\xea" "\xc1\xe6\xb0\x7c\xf5\xae\x86\x85\xe8\x3e\x2a\x86\x94\xf2\xda\xb7\xaa\x83" "\xa0\xca\xe9\xde\x2f\xdd\xf8\xce\x33\xfa\x4e\x50\xb7\xbd\x53\x27\x7a\x15" "\xc5\x97\xe5\xd9\xe8\x59\x7e\xce\x01\xd8\x2b\x22\x98\x89\x92\xdf\x52\xe2" "\x10\x87\x78\x84\xc5\xd2\xc2\x21\x22\xa2\x89\x24\xcc\xf8\xee\xd8\x71\x7e" "\xc1\xce\xdf\x1d\x07\x68\xd8\xc1\x44\xcf\xc6\x27\x6d\xfc\xff\x5b\x87\x55" "\x07\x50\x38\x99\x9b\x1a\x19\xff\x75\xbb\x4a\xa1\xda\xfd\xa8\x4e\x0a\xd7" "\x7b\x7a\x09\xa7\xd2\x9d\xee\x2a\x31\xad\xac\x77\x89\xf7\x33\x89\xf7\xb3" "\x30\x57\x56\x6c\x76\x29\x06\xad\x2a\x75\x2c\xce\xdc\xe6\x56\xd0\xb9\xb0" "\x71\x37\x68\x3b\x78\x8e\xa6\x15\x39\x6c\x59\xbf\xb6\xcd\xa5\xdb\x95\x17" "\x2d\x80\x95\x94\xb5\x69\x8e\x5e\x69\x73\x99\x87\x88\xf4\x19\xe5\xbc\xae" "\xc3\x8c\xaa\xc3\x9a\x89\xff\x21\x80\x58\xfc\x4b\xb9\x67\x2c\x80\xf8\x28" "\x3e\x8b\x1b\xc2\xc7\x1b\xb4\x7b\xf3\xbf\x9a\x14\xaa\x99\x74\x4b\xf9\x89" "\x96\x32\xf1\x5f\xcc\x2e\x51\xd7\xd2\x57\x47\xc1\xde\x36\x9a\xcd\xa6\x13" "\x3b\xe4\x98\x3e\xc9\x29\x7b\x06\x6b\x40\x2d\x3d\xb8\x59\x67\x9c\xb5\x65" "\xc6\xbe\x20\xf0\x07\xc5\xa9\x73\x1d\x4f\xe4\x32\xb5\xbb\x34\x20\xd7\x52" "\x6a\xae\x35\xbd\xbd\x0a\x27\x23\xd7\x72\x2c\x97\xaa\xcd\xe6\x56\xf0\x21" "\xfb\x54\xa5\x10\xaf\xc5\x75\xb1\x82\x1f\x78\x8f\x56\x64\xfe\xef\xa8\xf8" "\x1a\xc8\xed\x99\x61\xaf\x11\x0d\x33\x14\xe8\x4f\x5c\xf5\xce\x78\xcb\x46" "\xd4\x1a\x36\x45\x8f\x1c\xbb\x5f\x0f\x9e\x9a\xfd\xfd\xdd\xa5\xf7\x29\xd6" "\xb3\x42\xff\x95\x7f\x4f\xa3\x11\xbc\xc2\x6d\x5c\xc1\xe2\x83\xc7\x4f\xee" "\xb8\x41\xd0\xb9\xaf\x36\x6e\x05\xea\x72\xd5\x1b\xbd\x3d\xf7\x16\xec\x46" "\xd0\x99\x79\x01\x44\x93\x26\x65\x03\x7b\xe1\x9e\x3a\xa4\xd6\x77\x70\x77" "\x50\x2a\x33\xb0\xd5\xb1\x16\xa8\xee\x1f\x29\x49\xaa\x63\x85\x7b\x54\x2f" "\x2b\xbc\x5e\xea\x3e\x30\x01\xed\x5e\xdd\x46\xeb\xd3\x78\x2e\xa4\xee\xb4" "\x21\x96\xf4\x5b\x4a\x59\x62\x75\xf6\x6d\xc7\x48\x26\x55\x77\x6b\xa2\xf2" "\x84\x8d\x3e\xdc\xf1\x29\x53\x1d\x9a\x6e\xaa\x49\x85\x59\xff\x85\xeb\x95" "\x9a\x99\xec\xa9\x17\x3f\x75\x9e\x3e\xe4\x17\x01\xb6\x44\xa9\xe6\xd8\xbd" "\x15\x5c\x98\x57\x9a\x19\x39\x80\x23\x23\xad\xe0\xe6\xb3\x57\x70\xfd\x6b" "\xae\xbe\x35\xa3\x5e\x73\x9d\x3d\x0f\x9c\x1b\xfe\x8c\xbe\x8d\xf3\x1f\x21" "\x5a\xf8\x82\x9b\xfc\xfe\x9f\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88" "\x88\x88\x88\x88\x88\x88\x88\x88\x68\xda\x94\xf1\xff\x12\x55\xd7\x91\x88" "\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88" "\x88\x88\x88\x68\xda\xad\x7b\x30\xbf\x7b\x8d\xee\xf3\x7f\x31\xdc\xf3\x7f" "\x93\x8f\x62\x71\xcd\x4f\x82\x8f\xe5\xf9\xbf\xfb\xdb\xe0\xf3\x7f\x89\x8a" "\xf7\x27\x00\x00\xff\xff\x9b\x4e\x77\x32", 766); syz_mount_image( /*fs=*/0x4000000007c0, /*dir=*/0x400000000280, /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_NODIRATIME|MS_MANDLOCK|MS_DIRSYNC*/ 0x30008c0, /*opts=*/0x400000000800, /*chdir=*/0x11, /*size=*/0x2fe, /*img=*/0x4000000004c0); memcpy((void*)0x400000000040, "./file1\000", 8); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x400000000040ul, /*flags=O_CREAT|O_RDWR*/ 0x42, /*mode=*/0); memcpy((void*)0x400000000080, "./file0\000", 8); syscall(__NR_truncate, /*file=*/0x400000000080ul, /*len=*/0x87ffffeul); return 0; }