// https://syzkaller.appspot.com/bug?id=aed20a1748cce614db82f1776b66e16dafe2fc99 // 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 #ifndef __NR_openat #define __NR_openat 56 #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$hfs arguments: [ // fs: ptr[in, buffer] { // buffer: {68 66 73 00} (length 0x4) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // flags: mount_flags = 0x0 (8 bytes) // opts: ptr[inout, array[ANYUNION]] { // array[ANYUNION] { // } // } // chdir: int8 = 0x4 (1 bytes) // size: len = 0x346 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x346) // } // ] // returns fd_dir memcpy((void*)0x20000000, "hfs\000", 4); memcpy((void*)0x200000c0, "./file0\000", 8); memcpy( (void*)0x20000180, "\x78\x9c\xec\xdd\x4d\x4f\xd4\x4e\x1c\x07\xf0\xef\xf4\x61\xb7\xfb\x87\x3f" "\x56\xc0\x90\x78\x32\x28\x89\x27\x02\x78\xd0\x78\x81\x18\xe2\xd1\xb3\x07" "\x43\x44\x58\x12\xc2\x8a\x89\x62\xa2\xc4\x04\xf4\x6c\x8c\x37\x13\x13\x8f" "\xdc\x3c\x1b\x7d\x0b\x7a\x31\xbe\x00\xbd\x71\x30\x9e\xf4\x42\x3c\x58\x33" "\xd3\x69\xb7\xdb\x9d\xe9\xee\x02\x6e\x21\x7c\x3f\x09\x4b\xb7\x9d\x87\xdf" "\x6c\x3b\xed\xcc\x2e\x4b\x41\x44\x27\xd6\xb5\xf9\x6f\x3b\x97\x76\xe5\x8f" "\xf0\x01\xb8\x00\xae\x02\x0e\x80\x00\xf0\x00\x9c\xc1\x58\xf0\x70\x7d\xa3" "\x63\x41\x6e\xba\x24\x10\xe7\x14\x6d\x69\x96\xd6\xeb\xa6\xac\x01\x74\x0e" "\x2d\x94\xcf\x3c\x0c\x66\xd7\xd1\xbf\x11\x45\x51\x54\xed\x98\xea\x67\x5f" "\x62\xa1\xf2\x88\x6c\x0f\xce\x70\x80\xaa\xee\x9d\x6a\x7b\xd0\xf7\xc8\x0e" "\x6c\xd6\xb4\x72\x3b\x6e\xd7\xc9\xe2\x02\x3e\x50\x91\x8b\x62\x0f\x7b\x78" "\x84\xa1\xb2\x43\x22\x22\xa2\x72\xe9\xeb\xbf\xa3\xaf\xf3\x83\x7a\xfc\xee" "\x38\xc0\x84\x1e\x87\x1f\xd7\xeb\x7f\x22\x1d\xdf\xd4\xca\x8d\xe3\x48\x48" "\xaf\xff\x4e\xfc\x3c\x12\xf2\xf5\x39\xa5\x36\xc9\xf9\xde\xea\x46\xa3\xbe" "\x1c\x4f\xe1\xe4\xde\x77\x92\x59\xa2\xa9\x2c\xe3\x31\x11\x35\x87\x93\x6a" "\xc0\xe1\x00\xee\x40\x66\xc8\x95\xa9\xc5\x4c\xc5\xe2\xd4\x56\x56\x1b\xf5" "\xc9\x6d\x55\xc0\x33\xcc\x6a\x99\x64\xa3\xea\x71\x19\x49\x43\x14\x5b\xb4" "\x15\x60\x1a\xc0\xb8\x61\x6e\x5a\xa0\xa8\xed\xc5\x06\x54\x1b\x7c\xd9\x86" "\x19\x4b\xfc\x23\x45\x35\x7a\xd1\x56\xfb\xc6\x0f\xdf\xf1\xca\x5c\xdd\xc2" "\xa7\x2e\x62\x12\x1f\xc5\x67\xb1\x20\x42\xbc\xc6\x72\x3a\xfe\xf3\x22\x21" "\x5f\x1c\xb5\xa7\xc2\xdc\x54\x20\x8e\x7f\xca\x5e\xa2\x6a\x65\x18\xa7\x6a" "\x69\x65\x73\xfe\x7e\x5a\x55\x72\x56\xd7\x80\xf7\x6f\x9b\xad\xac\xd9\x5e" "\xd7\x00\xae\x8c\xc5\x44\x96\x22\xf2\xe3\xf7\x30\x89\xf3\x65\xc5\x9e\x0b" "\xc3\x68\x7d\x5b\x21\x6e\xdd\xb4\xbd\x75\x2a\xd7\x08\xe0\x09\x35\x6b\xc8" "\xe6\x9a\x49\x13\xfd\x36\xe6\x1a\xcd\xd7\x55\x5b\xf1\x1b\xf5\xc9\xa5\x7b" "\x0d\xdb\x41\x7f\xb8\x8c\x33\x3a\xf1\x42\xdc\x14\xe3\xf8\x81\x77\x98\xcf" "\x8c\xff\x1d\x99\x7a\x02\xf6\x9e\xd9\xd2\xcb\x85\x4a\xa9\x8f\x8c\xc2\xf6" "\x78\x13\x5f\xe3\x63\x2a\x17\x45\x7b\x4a\xd5\x81\xef\xf6\xd4\x33\x49\xb9" "\xde\x72\xf2\xeb\xce\x73\xdc\xc1\x15\x0c\x3d\x78\xbc\xb9\xb6\xd8\x68\xd4" "\xef\x97\xbf\x90\x74\x95\x7d\x66\x3f\x77\xc8\xf1\xc4\x07\xa2\x3e\x1c\xe5" "\x1a\xf9\x3b\x93\x06\x81\x5c\xf0\x01\x58\xcb\xf1\xed\x9b\x8c\x0b\x7f\xa2" "\x28\x32\x6e\xf2\xd0\x8f\x5d\xe0\xab\xa6\x5e\x7e\xd3\x6c\xf2\xe6\xda\xa2" "\xd0\xe7\xbc\x83\x55\x21\xcf\x9c\xb9\x4d\x73\xf6\xc4\x00\xe6\x00\xe8\x35" "\xc9\x19\x61\x3f\xb5\x6f\xa5\xb9\xaa\xcd\x02\xbb\xca\xfe\x4b\xee\x6d\xb5" "\xc6\x7c\x40\x26\x51\xf5\xa1\x83\x24\x55\xb5\x6c\x72\x51\xed\xaa\xa7\xd4" "\xda\xd6\xec\x74\xc8\xf5\xe4\xff\xfd\x9d\x85\xe8\x18\x6a\xee\x7d\x8c\xdd" "\x2a\x3b\x18\x2a\x83\x1c\x3b\x88\x78\xfe\x97\x99\xaf\x4c\xa9\xb3\x8e\x7c" "\x08\x0b\xe6\x3f\x51\xa7\xc2\x33\x25\x4e\x5b\x66\x40\xc3\xea\xf1\xbf\xee" "\x66\x70\x69\xb1\xd6\x71\xe2\x40\xb2\xd0\x61\xce\x75\xfe\x22\x70\x21\x57" "\xa3\x83\xa4\xc6\xa7\xf9\x62\x43\x1d\x27\x8e\xe2\xa7\x92\xbd\x7f\x94\x21" "\xe6\xf1\x05\xb7\xf9\xfe\x3f\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11\x11" "\x11\x11\x11\x11\x11\x11\x11\x11\xd1\x71\xd3\xeb\xb7\x11\xda\xbf\x4e\xd0" "\x79\x01\xb8\x91\xf9\xd3\xde\xdd\x13\xf8\x8f\x37\x88\x88\x88\x88\x88\x88" "\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x88\x0e" "\x26\x73\xff\x5f\xc0\x55\x77\x8c\xa9\x98\xee\xff\x5b\x74\xa7\x26\xc5\x8d" "\xef\x10\x13\x1c\xc6\xfd\x7f\xdd\x2e\xee\xff\x2b\xb6\x7b\x68\x25\x11\x99" "\xfc\x0d\x00\x00\xff\xff\x3d\xc4\x5d\x40", 838); syz_mount_image(/*fs=*/0x20000000, /*dir=*/0x200000c0, /*flags=*/0, /*opts=*/0x20001e80, /*chdir=*/4, /*size=*/0x346, /*img=*/0x20000180); // openat$cgroup_ro arguments: [ // fd: fd_cgroup (resource) // file: ptr[in, buffer] { // buffer: {63 70 75 2e 73 74 61 74 00} (length 0x9) // } // flags: const = 0x275a (4 bytes) // mode: const = 0x0 (2 bytes) // ] // returns fd memcpy((void*)0x20000080, "cpu.stat\000", 9); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000080ul, /*flags=*/0x275a, /*mode=*/0); // openat arguments: [ // fd: fd_dir (resource) // file: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 // 61 00} (length 0xfc) // } // flags: open_flags = 0x141042 (4 bytes) // mode: open_mode = 0x82 (2 bytes) // ] // returns fd memcpy((void*)0x20000800, "./" "file0aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\000", 252); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000800ul, /*flags=O_SYNC|O_NOATIME|O_CREAT|O_RDWR*/ 0x141042, /*mode=S_IWOTH|S_IWUSR*/ 0x82); return 0; }