// https://syzkaller.appspot.com/bug?id=39933860c3eb316f3fac7fbd2be1e765dc276deb // 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_ioctl #define __NR_ioctl 29 #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_pwrite64 #define __NR_pwrite64 68 #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[2] = {0xffffffffffffffff, 0xffffffffffffffff}; 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; intptr_t res = 0; 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 31 00} (length 0x8) // } // flags: mount_flags = 0x21081c (8 bytes) // opts: ptr[in, fs_options[ext4_options]] { // fs_options[ext4_options] { // elems: array[fs_opt_elem[ext4_options]] { // } // common: array[fs_opt_elem[fs_options_common]] { // } // null: const = 0x0 (1 bytes) // } // } // chdir: int8 = 0x1 (1 bytes) // size: len = 0x4fd (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x4fd) // } // ] // returns fd_dir memcpy((void*)0x20000180, "ext4\000", 5); memcpy((void*)0x20000040, "./file1\000", 8); *(uint8_t*)0x20000000 = 0; memcpy( (void*)0x20000ac0, "\x78\x9c\xec\xdd\xc1\x6f\x1b\x59\x19\x00\xf0\xcf\x4e\x9c\x38\x69\x76\x93" "\x5d\xf6\x00\x08\x76\xcb\xee\x42\x41\x55\x9d\xc4\xdd\x8d\x56\x7b\x80\xdd" "\x13\x42\x68\x25\xc4\x1e\x41\x6a\x43\xe2\x46\x51\xec\x38\x8a\x9d\xd2\x84" "\x1e\xd2\x33\x57\x24\x2a\x71\x82\x23\x7f\x00\xe7\x9e\xb8\x73\x41\x70\xe3" "\x52\x0e\x48\x05\x22\x50\x83\xc4\xc1\xab\x19\x4f\x52\x37\xb5\x9b\xa8\x49" "\xec\x28\xfe\xfd\xa4\xd1\xbc\x37\x6f\xea\xef\x7b\x75\x66\x5e\xfc\x1c\xfb" "\x05\x30\xb4\xae\x46\xc4\x6e\x44\x8c\x45\xc4\xed\x88\x98\xce\x8e\xe7\xb2" "\x2d\x3e\x69\x6f\xc9\x79\x4f\xf7\xee\x2f\xed\xef\xdd\x5f\xca\x45\xab\xf5" "\xf9\xbf\x72\x69\x7b\x72\x2c\x3a\xfe\x4d\xe2\x4a\xf6\x98\xc5\x88\xf8\xf1" 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"\x06\x9d\x06\x00\xd0\x47\x5e\xff\x03\xc0\xf0\x31\xfe\x03\xc0\x50\xf9\xd1" "\x67\x9f\x25\x5b\x6b\x3f\xfb\xfe\xeb\xe5\xbb\xdb\x5b\x6b\xf5\xbb\x37\x96" "\x2b\x8d\xb5\x52\x6d\x6b\xa9\xb4\x54\xdf\xdc\x28\xad\xd4\xeb\x2b\xe9\x77" "\xf6\xd4\x8e\x7b\xbc\x6a\xbd\xbe\x31\xff\x41\x6c\xdd\x9b\xf9\xee\x46\xa3" "\x39\xdb\xd8\xde\xb9\x55\xab\x6f\xad\x37\x6f\xa5\xdf\xeb\x7d\xab\x52\x48" "\xcf\xda\xed\x43\xcf\x00\x80\x5e\xde\x78\xe7\xd1\x5f\x73\xc9\x88\xfc\xf1" "\x44\xba\x45\xc7\x5a\x0e\x85\x81\x66\x06\x9c\xb7\xfc\xa0\x13\x00\x06\x66" "\x64\xd0\x09\x00\x03\x63\xb5\x2f\x18\x5e\xa7\x78\x8d\x6f\x7a\x00\x2e\x89" "\x2e\x4b\xf4\x3e\xa7\xd8\xed\x03\x42\xad\x56\xab\x75\x7e\x29\x01\xe7\xec" "\xda\x57\xcc\xff\xc3\xb0\xea\x98\xff\xf7\x57\xc0\x30\x64\xcc\xff\xc3\xf0" "\x32\xff\x0f\xc3\xab\xd5\xca\x9d\x74\xcd\xff\x38\xe9\x89\x00\xc0\xc5\x66" "\x8e\x1f\xe8\xf1\xfe\xff\x9b\xd9\xfe\xf7\xd9\x9b\x03\x3f\x5d\x3e\x7a\xc6" "\xc3\xf3\xcc\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x2e\xb6\x83\xf5\x7f\x4b\xd9\x5a" "\xe0\x53\x91\xcf\x97\x4a\x11\xaf\x45\xc4\x4c\x14\x72\x77\x56\xab\x95\xb9" "\x88\x78\x3d\x22\xfe\x32\x5e\x18\x4f\xea\xf3\x03\xce\x19\x00\x38\xad\xfc" "\x3f\x72\xd9\xfa\x5f\xd7\xa6\xdf\x9f\x7a\xae\xe9\xed\x2b\x87\xc5\xb1\x88" "\xf8\xf9\x6f\x3e\xff\xf5\xbd\xc5\x66\x73\xf3\xcf\x11\x63\xb9\x7f\x8f\x1f" "\x1c\x6f\x3e\xcc\x8e\x97\xfb\x9f\x3d\x00\x70\xbc\x83\x71\x3a\xdd\x77\xbc" "\x90\x7f\xba\x77\x7f\xe9\x60\xeb\x67\x3e\x4f\x3e\x8d\x88\x62\x3b\xfe\xfe" "\xde\x58\xec\x1f\xc6\x1f\x8d\xd1\x74\x5f\x8c\x42\x44\x4c\xfe\x27\x97\xd5" "\xdb\x72\x1d\x73\x17\xa7\xb1\xfb\x20\x22\xbe\xdc\xad\xff\xb9\x98\x4a\xe7" "\x40\xda\x2b\x9f\x1e\x8d\x9f\xc4\x7e\xad\xaf\xf1\xf3\xcf\xc5\xcf\xa7\x6d" "\xed\x7d\xf2\x7f\xf1\xa5\x33\xc8\x05\x86\xcd\xa3\xe4\xfe\xf3\x49\xb7\xeb" "\x2f\x1f\x57\xd3\x7d\xf7\xeb\xbf\x98\xde\xa1\x4e\xef\xc9\xa7\x31\x91\x15" "\x97\xf6\xd3\x7b\xe0\xb3\xf8\x07\xf7\xbf\x91\x1e\xf7\xbf\xab\x27\x8d\xf1" "\xc1\x1f\x7f\xd0\x2e\x4d\xbc\xd8\xf6\x20\xe2\xab\xa3\x11\x07\xb1\xf7\x3b" "\xee\x3f\x07\xf1\x73\x3d\xe2\xbf\x7f\xc2\xf8\x7f\xfb\xda\xdb\xef\xf6\x6a" "\x6b\xfd\x36\xe2\x5a\x74\x8f\xdf\x19\x6b\xb6\x59\xdb\x98\x6d\x6c\xef\xdc" "\x58\xad\x2d\xae\x54\x56\x2a\xeb\xe5\xf2\xc2\xfc\xc2\xdc\x47\x37\x3f\x2c" "\xcf\xa6\x73\xd4\xb3\x47\x46\x83\x8e\x64\xff\xf9\xf1\xf5\xd7\x7b\xc5\x4f" "\xfa\x3f\xd9\x23\x7e\xf1\x98\xfe\x7f\xf3\x84\xfd\xff\xdd\xff\x6f\xff\xe4" "\x1b\x2f\x89\xff\xed\xf7\xba\xc5\xcf\xc7\x5b\x2f\x89\x9f\x8c\x89\xdf\x3a" "\x61\xfc\xc5\xc9\x3f\x14\x7b\xb5\x25\xf1\x97\x7b\xf4\xff\xb8\xe7\xff\xfa" "\x09\xe3\x3f\xfe\xfb\xce\x0b\xcb\x86\x03\x00\x83\xd3\xd8\xde\x59\x5b\xac" "\x56\x2b\x9b\x0a\x0a\x17\xbf\x90\xfc\xc8\x5e\x80\x34\xba\x16\xbe\xd7\xaf" "\x58\x63\xd1\xbd\xe9\x97\xef\xb5\xaf\xe9\x23\x4d\xad\xd6\x2b\xc5\xea\x75" "\xc7\x38\x8b\x59\x37\xe0\x22\x38\xbc\xe8\x23\xe2\x7f\x83\x4e\x06\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\xe8\xaa\x1f\x9f\x58\x1a\x74\x1f\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" "\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\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\xb8\xbc\xbe\x08\x00\x00\xff\xff\x44\xe3\xcf\x24", 1277); syz_mount_image( /*fs=*/0x20000180, /*dir=*/0x20000040, /*flags=MS_POSIXACL|MS_SYNCHRONOUS|MS_RELATIME|MS_NOEXEC|0x804*/ 0x21081c, /*opts=*/0x20000000, /*chdir=*/1, /*size=*/0x4fd, /*img=*/0x20000ac0); // openat arguments: [ // fd: fd_dir (resource) // file: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8) // } // flags: open_flags = 0x101042 (4 bytes) // mode: open_mode = 0x45 (2 bytes) // ] // returns fd memcpy((void*)0x200000c0, "./file1\000", 8); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x200000c0ul, /*flags=O_SYNC|O_CREAT|O_RDWR*/ 0x101042, /*mode=S_IXOTH|S_IROTH|S_IXUSR*/ 0x45); if (res != -1) r[0] = res; // ioctl$FS_IOC_SETFLAGS arguments: [ // fd: fd (resource) // cmd: const = 0x40086602 (4 bytes) // arg: ptr[in, fs_flags] { // fs_flags = 0x0 (4 bytes) // } // ] *(uint32_t*)0x20000140 = 0; syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x40086602, /*arg=*/0x20000140ul); // openat arguments: [ // fd: fd_dir (resource) // file: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8) // } // flags: open_flags = 0x8441 (4 bytes) // mode: open_mode = 0x59 (2 bytes) // ] // returns fd memcpy((void*)0x20000040, "./file1\000", 8); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000040ul, /*flags=O_NOFOLLOW|O_CREAT|O_APPEND|O_WRONLY*/ 0x8441, /*mode=S_IXOTH|S_IXGRP|S_IWGRP|S_IXUSR*/ 0x59); if (res != -1) r[1] = res; // pwrite64 arguments: [ // fd: fd (resource) // buf: ptr[in, buffer] { // buffer: {f6} (length 0x1) // } // count: len = 0xffffff07 (8 bytes) // pos: intptr = 0x8000c61 (8 bytes) // ] memset((void*)0x20000140, 246, 1); syscall(__NR_pwrite64, /*fd=*/r[1], /*buf=*/0x20000140ul, /*count=*/0xffffff07ul, /*pos=*/0x8000c61ul); // ioctl$EXT4_IOC_MIGRATE arguments: [ // fd: fd (resource) // cmd: const = 0x6609 (4 bytes) // ] syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0x6609, 0); return 0; }