// https://syzkaller.appspot.com/bug?id=d4a58de9696a60f9c0d79531cdc0d622e474e786 // 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_ftruncate #define __NR_ftruncate 46 #endif #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_sched_setscheduler #define __NR_sched_setscheduler 119 #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; } uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-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=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); const char* reason; (void)reason; intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x20000180, "hfs\000", 4); memcpy((void*)0x20000100, "\023\023w\305\3745\324\024T\325\324\035)\255\032`)" "Y\201F\346\276\026nA\255\r\275@T\003<\2373\273\332\202$" "\242\363\327r\347cnH\263<\277p\203r\350\361\271\223>" "\305\022wC\276\"\006 \236\360-\371\313\362\366\350\200\3238/\000", 78); memcpy( (void*)0x20000500, "\x71\x75\x69\x65\x74\x2c\x63\x6f\x64\x65\x70\x61\x67\x65\x3d\x69\x73\x6f" "\x38\x38\x35\x39\x2d\x31\x35\x2c\x70\x61\x72\x74\x3d\x30\x78\x30\x30\x30" "\x30\x30\x30\x30\x00\x00\x00\x00\x00\x00\x00\x00\x66\x2c\x00\xa2\x00\x00" "\x00\x07\x00\x00\x00\x00\xed\xe9\xde\xbf\x53\x0c\x3c\xc4\xd0\x4b\x54\x89" "\x19\xac\xa0\xc2\x93\x7d\x4d\xa1\xfc\x31\xdc\x42\xfc\x2e\x3e", 87); memcpy( (void*)0x20000600, "\x78\x9c\xec\xdd\xcd\x6a\x13\x5d\x1c\xc7\xf1\xdf\x99\xa4\x6d\x9e\xa7\xa1" "\x4e\x5f\x44\x70\x59\x2d\xe8\x46\x6a\xdd\x88\x9b\x88\xe4\x22\xc4\x85\xa8" "\x4d\x84\x62\xa8\xa8\x15\xd4\x8d\x55\x5c\x89\xe8\xde\xbd\xb7\xe0\x45\xb8" "\x51\xbc\x01\x5d\xb9\xf2\x02\xea\x6a\xe4\x9c\x39\x79\xed\xbc\xa4\xa1\x99" "\x69\xf0\xfb\x81\x84\xc9\xcc\x39\x73\xfe\x27\xf3\x72\xce\x3f\xd0\x8e\x00" "\xfc\xb3\x6e\x34\x7f\x7c\xba\xf2\xcb\xbe\x8c\x54\x51\x45\x7a\x7b\x4d\x0a" "\x24\xd5\xa4\xaa\xa4\xd3\x3a\x53\x7b\xba\xbb\xb7\xb3\xd7\x69\xb7\xb2\x76" "\x54\x71\x35\xec\xcb\x28\xae\x69\x0e\x95\xd9\xde\x6d\x27\x55\xb5\xf5\x5c" "\x0d\x2f\xb4\x9f\xaa\xaa\x0f\xae\xc3\x74\x44\x51\x74\xfd\x67\xd9\x41\xa0" "\x74\xee\xea\x4f\x10\x48\x0b\xfe\xea\x74\xdb\x6b\x85\x47\x96\xed\xd5\x84" "\xf5\xf6\x8f\x39\x8e\x59\x63\x0e\x74\xa0\x67\x5a\x2a\x3b\x0e\x00\x40\xb9" "\xfc\xf8\x1f\xf8\x71\xbe\xee\xe7\xef\x41\x20\x6d\xf8\x61\xff\x44\x8e\xff" "\x93\x3a\x28\x3b\x80\xa9\x8b\x32\xb7\x0e\x8c\xff\x2e\xcb\x8a\x8c\x3d\xbe" "\xa7\xdc\xa6\x7e\xbe\xe7\x52\x38\xbb\x3d\xe8\x66\x89\xe3\xb4\x3c\x37\xf2" "\x79\x5e\xf1\x99\x35\x34\xc1\x34\x79\x59\xa5\x8b\x25\xf8\xef\xfe\x4e\xa7" "\x7d\x69\xfb\x61\xa7\x15\xe8\xb5\x1a\xde\x40\xb1\x35\xf7\xde\x8a\x4f\xdd" "\xae\x9c\x68\xd7\x13\x72\xd3\x0c\x63\xf4\xdd\x24\xcf\x28\x17\x5d\x1f\xe6" "\x6c\x1f\xb6\x52\xe2\x5f\x9d\xb0\xc5\x89\x99\x2f\xe6\x9b\xb9\x6d\x42\x7d" "\x54\xab\x37\xff\xab\x46\xc6\x1e\x26\x77\xa4\xc2\x91\x23\x15\xc7\xbf\x99" "\xbe\x47\xd7\xcb\xd0\x96\x92\xbf\x6d\x34\x1a\x8d\x60\xa8\xc8\xb2\x6b\xe4" "\xac\x6f\xc1\xcb\xe9\x65\x2d\x39\x23\x51\xf7\x8c\x5a\xd6\xf0\x0f\x04\x61" "\x5e\x9c\xae\xd6\xca\x48\xad\xb8\x77\x97\x73\x6a\xad\x26\xd6\xda\xea\x7e" "\x4a\xa9\xb5\x36\x54\xcb\xf6\xa6\x77\x36\xa7\xb7\x37\x6d\xe6\xbd\xb9\x69" "\xd6\xf5\x5b\x9f\xd5\x1c\x98\xff\x07\x36\xbe\x0d\x65\x5e\x99\xfd\xab\xc6" "\x6c\xc4\x43\x81\xfb\xc6\xe3\xfe\xcc\x27\x37\x57\x75\xfb\x0c\x0f\x8d\x1c" "\xfb\xba\x55\x1f\x5e\xd3\xfb\x16\x17\xd2\x42\xff\x93\x7d\x4f\xc3\x11\xbc" "\xd3\x3d\x5d\xd5\xd2\x93\xe7\x2f\x1e\x54\x3a\x9d\xf6\x63\xbb\x70\x37\x61" "\xe1\x51\xbd\xb7\x66\xee\x8d\x94\x58\xa6\xe4\x05\xed\xf7\xd7\x2c\x28\x72" "\x0e\x15\xee\x0e\x4a\x45\x06\x76\xf1\x58\x77\x68\xef\x1f\xb9\x85\xed\x55" "\x56\x48\x07\x4f\xe4\x99\x50\xd4\x42\xf3\x6b\xb1\x27\x52\x19\x0b\x25\xdf" "\x9f\x50\x88\xfe\x41\x2f\x3b\x12\x94\xc4\xce\xbb\x4c\x9c\xff\x0d\xe4\x2b" "\x9b\x6e\xb2\x67\xdf\xc2\x8c\x79\x7a\xee\x84\xcc\xef\x31\xb2\x73\xec\x5e" "\x06\x54\x1b\xaa\xbf\xe2\x96\xfe\x3f\x52\x06\xb7\x98\x9e\xc1\x8d\x9b\x73" "\x9d\xbb\x20\x9d\x1f\xbf\xc5\xd0\xc7\x39\x1b\xa2\x97\x39\x05\x4c\x53\xdf" "\x75\x87\xdf\xff\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x66\x4d\x11\x7f\x4e\x50\x76\x1f\x01\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x98\x75\xbd\xe7\xff\xaa\xfb\xfc\x5f\x8d" "\xf7\xfc\xdf\xd1\xff\xfc\x7d\x9c\xcf\xff\xfd\xb0\x2b\x9e\xff\x0b\x4c\xdf" "\xdf\x00\x00\x00\xff\xff\x4e\xb6\x80\x35", 694); syz_mount_image(/*fs=*/0x20000180, /*dir=*/0x20000100, /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_DIRSYNC*/ 0x3000080, /*opts=*/0x20000500, /*chdir=*/0x11, /*size=*/0x2b6, /*img=*/0x20000600); memcpy((void*)0x20000080, "cpuset.memory_pressure_enabled\000", 31); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000080ul, /*flags=*/0x275aul, /*mode=*/0ul); if (res != -1) r[0] = res; syscall(__NR_sched_setscheduler, /*pid=*/0, /*policy=SCHED_FIFO*/ 1ul, /*prio=*/0ul); syscall(__NR_ftruncate, /*fd=*/r[0], /*len=*/0x100c17aul); return 0; }