// https://syzkaller.appspot.com/bug?id=8044da1bfbc0e081a6fffab422931f0cea31d3a6 // 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; //% 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; } uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000, /*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=*/0x200001000000ul, /*len=*/0x1000, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } // syz_mount_image$hfs arguments: [ // fs: ptr[in, buffer] { // buffer: {68 66 73 00} (length 0x4) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8) // } // flags: mount_flags = 0x2004890 (8 bytes) // opts: ptr[inout, array[ANYUNION]] { // array[ANYUNION] { // union ANYUNION { // ANYRES8: ANYRES8 (resource) // } // } // } // chdir: int8 = 0xfd (1 bytes) // size: len = 0x2b9 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x2b9) // } // ] // returns fd_dir memcpy((void*)0x200000002c80, "hfs\000", 4); memcpy((void*)0x200000000140, "./file1\000", 8); *(uint8_t*)0x200000000040 = 0; memcpy( (void*)0x200000000440, "\x78\x9c\xec\xdd\xc1\x4e\x13\x5f\x14\xc7\xf1\xdf\x9d\x16\xda\xff\x1f\x03" "\x83\x60\x4c\x0c\x2b\x94\xc4\x95\x11\xdc\x18\x37\x4d\x0c\x6f\xe0\xc6\x95" "\x51\x69\x4d\x88\x0d\x26\x82\x89\xb8\x42\xd7\xc6\x07\x70\xcf\x2b\xf8\x00" "\x2e\x5d\x19\xd7\x26\xec\x5c\xf9\x00\xec\x6a\xee\x99\x3b\x74\x4a\x7b\x0b" "\x08\x65\x0a\x7e\x3f\x09\xcd\x74\x66\xce\xcc\xb9\x33\x73\x9d\x7b\xa6\x31" "\x23\x00\xff\xac\x87\xab\x7b\xbb\xf7\x7e\xf9\x3f\x27\x55\x54\x91\xf4\x40" "\x4a\x24\xd5\xa5\xaa\xa4\x6b\xba\x5e\x7f\xb3\xb1\xb5\xbe\xd5\x6e\x35\xfb" "\xc3\x3b\x07\x53\x15\x8b\xf0\x7f\x4e\x59\xa4\xeb\x5b\x7b\x6d\xa3\x35\x28" "\x07\x1f\x67\x11\x41\xea\xbf\x55\x75\xa5\x38\x0f\xa3\x51\xff\xa9\x9d\x85" "\xa9\xb2\xb3\x40\xd9\xac\xf7\x0f\x90\x48\xb5\xd0\x3b\x6d\x79\xfd\xdc\x33" "\xc3\x28\xb8\x7d\xed\xeb\xad\xa6\xcb\xce\x03\x00\x50\xae\x70\xff\x4f\xb2" "\xfb\x7c\x25\xcc\x52\x92\x48\x4b\xe1\xb6\x6f\xf3\xeb\xf9\xa8\x7e\xa7\xdc" "\x7c\x4f\x6b\xbf\xec\x04\x46\xec\xeb\x11\xcb\x0b\xf7\x7f\xab\xb2\x3a\xce" "\x9f\xdf\x19\x5b\xd4\xad\xf7\xec\x64\x57\x35\x71\xba\x5c\x26\x95\x5d\x59" "\x3d\x03\x4c\x37\xa4\xaa\x34\x96\xcb\xfb\xff\x5e\xac\xb7\x5b\x77\xd6\x5e" "\xb5\x9b\x89\x3e\xa8\xd1\x68\x34\xb6\xa5\x62\x42\xf3\xf6\xd9\xcc\x2e\xdd" "\xdc\xde\xae\xb3\x9a\xd6\x36\xd1\xbf\xe9\xc5\x50\x9b\x1e\xb3\xbe\xcc\x2b" "\xe4\xc8\xe2\x24\x1e\x69\x85\x55\x32\xe1\xdb\xb0\x92\xe7\xef\x15\x56\x99" "\xfb\x8b\x3d\x9e\x8a\xfb\xe6\xbe\xbb\x27\x2e\xd5\x67\x35\x0f\xc6\x7f\xd5" "\x8e\xf3\xa7\xc9\xce\x54\x7a\xe8\x4c\x65\xf9\xdf\x8d\x6f\xd1\x5a\x39\x29" "\x5b\x2b\xd2\xca\x59\xdb\xc9\x8d\xb0\x87\x60\x68\x2b\x2b\x8a\x54\x24\xca" "\xaf\xa8\xd9\x43\x27\x30\x8d\xe4\x59\xed\x89\x92\xeb\x8d\xca\x5a\xb7\x1c" "\x6f\x9d\x45\xcd\x69\x50\xd4\xca\x11\x51\xf3\x87\xa3\xba\x57\x73\x3c\x72" "\xd4\xdc\x27\xf7\xd8\x2d\xea\xb7\xbe\x68\xb5\x30\xfe\x4f\xfc\xd1\x5e\x52" "\xde\x33\x2b\x43\x7a\xa6\x5f\xc7\xd6\x0c\x57\xc6\xd0\xf6\x54\x6d\xcd\xd4" "\x0e\x7c\xb8\x77\xec\x2c\x0c\x5c\x73\x48\x3f\xc2\x99\xfb\xa8\xe7\xba\xaf" "\xe9\xcd\xed\x77\x2f\x9f\xb5\xdb\xad\xd7\x17\x7e\x22\x6f\x58\x98\x93\x3f" "\xa8\xd8\xf4\x3d\x71\x3c\x32\x1c\x9f\x89\xfc\x58\x8d\x4b\x3e\x63\x30\xb1" "\x32\x92\x2d\x17\x2e\xc8\xf3\x6d\x4e\x7e\xdf\xe9\x5b\x54\xcb\xfb\xc5\x51" "\xdb\x89\xff\xd3\xc1\x63\xf9\xcb\xa3\x7b\xd2\x4f\x18\xc8\x45\x70\x59\xf8" "\x71\x97\xcb\xea\xbf\xa9\xac\xdc\xb3\x51\x9d\x0d\xd6\xfc\x47\xda\x3b\x4e" "\xaf\x15\x63\x3b\x7d\x5b\xeb\xcc\xf4\x7c\x2d\x54\x40\xcb\x91\xda\xe0\xaa" "\x7d\xfe\xdf\xfb\xd3\x42\xb4\x36\x70\xf6\xe8\x61\x6a\xc0\xaf\x8b\xfd\x7b" "\x1c\x5a\x73\xdd\xbc\x2d\xdd\x3a\xce\x1e\x33\x69\xc8\x73\x2c\x45\x0f\x46" "\x3c\x62\x55\x3f\xf4\x94\xe7\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x17\xcd\xd9\xfd\x97\x83\xba\x62\x8b\xca\x6e\x23\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x17\xdd" "\x80\xf7\xff\xd6\x4e\xf0\xfe\xdf\xae\xb3\x7a\xff\xef\x23\x65\xdf\x78\xff" "\x2f\x30\x72\x7f\x02\x00\x00\xff\xff\x9e\x38\x67\xae", 697); syz_mount_image( /*fs=*/0x200000002c80, /*dir=*/0x200000000140, /*flags=MS_LAZYTIME|MS_REC|MS_SYNCHRONOUS|MS_NODIRATIME|MS_DIRSYNC*/ 0x2004890, /*opts=*/0x200000000040, /*chdir=*/0xfd, /*size=*/0x2b9, /*img=*/0x200000000440); // openat$cgroup_ro arguments: [ // fd: fd_cgroup (resource) // file: ptr[in, buffer] { // buffer: {6d 65 6d 6f 72 79 2e 65 76 65 6e 74 73 2e 6c 6f 63 61 6c 00} // (length 0x14) // } // flags: const = 0x275a (4 bytes) // mode: const = 0x0 (2 bytes) // ] // returns fd memcpy((void*)0x200000000840, "memory.events.local\000", 20); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000000840ul, /*flags=*/0x275a, /*mode=*/0); if (res != -1) r[0] = res; // write$binfmt_script arguments: [ // fd: fd_binfmt (resource) // data: ptr[in, binfmt_script] { // binfmt_script { // hdr: buffer: {23 21 20} (length 0x3) // bin: buffer: {} (length 0x0) // args: array[binfmt_script_arg] { // } // nl: const = 0xa (1 bytes) // data: buffer: {} (length 0x0) // } // } // len: bytesize = 0x208e24b (8 bytes) // ] memcpy((void*)0x200000000040, "#! ", 3); *(uint8_t*)0x200000000043 = 0xa; syscall(__NR_write, /*fd=*/r[0], /*data=*/0x200000000040ul, /*len=*/0x208e24bul); return 0; }