// https://syzkaller.appspot.com/bug?id=341fd72c403ed36b9250aa464527f117e2457bc9 // 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 #include #ifndef __NR_memfd_create #define __NR_memfd_create 279 #endif #ifndef __NR_mmap #define __NR_mmap 222 #endif #ifndef __NR_mprotect #define __NR_mprotect 226 #endif #ifndef __NR_openat #define __NR_openat 56 #endif #ifndef __NR_pwrite64 #define __NR_pwrite64 68 #endif #ifndef __NR_quotactl #define __NR_quotactl 60 #endif static unsigned long long procid; static __thread int clone_ongoing; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) { exit(sig); } uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0; int valid = addr < prog_start || addr > prog_end; if (skip && valid) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = SIG_IGN; syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8); syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8); memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ ({ \ int ok = 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } else \ ok = 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) static void use_temporary_dir(void) { char tmpdir_template[] = "./syzkaller.XXXXXX"; char* tmpdir = mkdtemp(tmpdir_template); if (!tmpdir) exit(1); if (chmod(tmpdir, 0777)) exit(1); if (chdir(tmpdir)) exit(1); } //% 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; install_segv_handler(); use_temporary_dir(); 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 32 00} (length 0x5) // } // dir: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 30 00} (length 0x8) // } // flags: mount_flags = 0x0 (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 = 0x45 (1 bytes) // size: len = 0x477 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x477) // } // ] // returns fd_dir NONFAILING(memcpy((void*)0x20000000, "ext2\000", 5)); NONFAILING(memcpy((void*)0x20000240, "./file0\000", 8)); NONFAILING(*(uint8_t*)0x20000080 = 0); NONFAILING(memcpy( (void*)0x20000280, "\x78\x9c\xec\xdc\xcf\x6f\x14\x55\x1c\x00\xf0\xef\x4c\x7f\xf0\xdb\x56\x44" "\x11\x04\xac\xa2\x91\xf8\xa3\xa5\x15\x90\x83\x17\x8d\x26\x1e\x34\x31\xd1" "\x03\xc6\x53\x6d\x0b\x41\x0a\x35\xb4\x24\xb6\x21\x5a\x3d\x60\x3c\x19\x12" "\xef\xc6\xa3\x89\x7f\x81\x27\xbd\x18\xf5\xea\x55\xe3\xd5\x90\x10\xc3\x05" "\x34\x31\x59\x33\xbb\x33\x74\xd9\xce\xd6\x16\xb6\x4c\xc3\x7e\x3e\xc9\xc0" "\x7b\xf3\x66\xf7\xbd\xef\xcc\xbc\xd9\x37\xf3\x76\x1b\x40\xd7\x1a\xca\xfe" "\x49\x22\xb6\x47\xc4\x6f\x11\x31\xd0\xc8\xde\xba\xc1\x50\xe3\xbf\x1b\xd7" "\x2e\x4e\xfc\x7d\xed\xe2\x44\x12\xb5\xda\x5b\x7f\x25\xf5\xed\xae\x5f\xbb" "\x38\x51\x6c\x5a\xbc\x6e\x5b\x23\x53\xab\xe5\xf9\x4d\x25\xf5\x5e\x7a\x37" "\x62\x7c\x7a\x7a\xea\x7c\x9e\x1f\x99\x3b\xfb\xc1\xc8\xec\xfc\xc2\x73\xa7" "\xcf\x8e\x9f\x9a\x3a\x35\x75\x6e\xec\xf8\xf1\x23\xcf\xef\xef\x3f\x36\x76" "\xb4\x23\x71\x66\x71\x5d\xdf\xfb\xd1\xcc\xbe\x3d\xaf\xbd\x73\xf9\x8d\x89" "\x13\x97\xdf\xfb\xf9\xdb\xac\xbd\xdb\xf3\xf2\xe6\x38\x3a\x65\xa8\xb1\x77" "\x4b\x3d\xd9\xe9\xca\x2a\xb6\xa3\x29\x9d\xf4\x56\xd8\x10\xd6\xe4\xdf\x88" "\xc8\x0e\x57\x5f\xbd\xff\x0f\x44\x4f\x6c\xb9\x59\x36\x10\xaf\x7e\x5a\x69" "\xe3\x80\x75\x55\xab\xd5\x6a\x65\x9f\xcf\xb9\xc5\x1a\x70\x0f\x4b\xa2\xea" "\x16\x00\xd5\x28\x3e\xe8\xb3\xfb\xdf\x62\xb9\x4b\x43\x8f\x0d\xe1\xea\x4b" "\x8d\x1b\xa0\x2c\xee\x1b\xf9\xd2\x28\xe9\x8d\x34\x22\x36\xe7\xf7\x46\x3b" "\xd6\xa9\xfe\xa1\x88\x38\xb1\xf8\xcf\x57\xd9\x12\xeb\xf4\x1c\x02\x00\xa0" "\xd9\xf7\xd9\xf8\xe7\xd9\xb2\xf1\x5f\x1a\x0f\x35\x6d\x77\x5f\x3e\x87\x32" "\x18\x11\xf7\x47\xc4\xce\x88\x78\x20\x22\x76\x45\xc4\x83\x11\xf5\x6d\x77" "\x47\xc4\xc3\x6b\xac\xbf\x75\x86\x64\xf9\xf8\x27\xbd\x72\x5b\x81\xad\x52" "\x36\xfe\x7b\x31\x9f\xdb\xba\x75\xfc\x97\x16\x9b\x0c\xf6\xe4\xb9\x1d\xf5" "\xf8\xfb\x92\x93\xa7\xa7\xa7\x0e\xe7\xfb\xe4\x50\xf4\x6d\xca\xf2\xa3\x2b" "\xd4\xf1\xc3\x2b\xbf\x7e\xd1\xae\xac\x79\xfc\x97\x2d\x59\xfd\xc5\x58\x30" "\x6f\xc7\x95\xde\x96\x07\x74\x93\xe3\x73\xe3\x77\x12\x73\xb3\xab\x9f\x44" "\xec\xed\x2d\x8b\x3f\x89\x62\x1a\x27\x89\x88\x3d\x11\xb1\xf7\x36\xeb\x38" "\xfd\xf4\x37\xfb\xda\x95\xb5\xc4\x9f\xed\xe6\x96\xf8\x57\xd0\x81\x79\xa6" "\xda\xd7\x11\x4f\x35\x8e\xff\x62\xb4\xc4\x5f\x48\xda\xce\x4f\x8e\xbe\x70" "\x6c\xec\xe8\xc8\xe6\x98\x9e\x3a\x3c\x52\x9c\x15\xcb\xfd\xf2\xf9\xc9\x37" "\x97\xaf\x6d\xbc\xff\xff\x1f\xff\xf5\x95\x1d\xff\xad\xa5\xe7\x7f\xa3\x7d" "\x7d\x11\x83\xc9\xe6\x88\xd9\xf9\x85\x33\xf5\xf9\xda\xd9\xb5\xd7\x71\xe9" "\xf7\xcf\xda\xde\xd3\x2c\xc5\xdf\x1b\x6b\x39\xff\xfb\x93\xb7\xeb\xe9\xfe" "\x7c\xdd\x87\xe3\x73\x73\xe7\x47\x23\xfa\x93\xd7\x97\xaf\x1f\x5b\x7a\x6d" "\x91\x2f\xb6\xcf\xe2\x3f\x74\xb0\xbc\xff\xef\x8c\xa5\x3d\xf1\x48\x44\x64" "\x27\xf1\xfe\x88\x38\x10\x11\x8f\xe6\x6d\x7f\x2c\x22\x1e\x8f\x88\x83\xed" "\x02\xfc\x63\x77\xfc\xf4\xf2\x13\xef\xb7\x9b\x09\x2e\x3f\xfe\x5b\x22\x62" "\x53\x5f\xdb\x1d\xda\x41\x59\xfc\x93\x2b\x1c\xff\xec\x92\x97\xa5\x96\x8e" "\x7f\xeb\x89\xb0\x58\x52\x74\x6b\xa2\xe7\xcc\x8f\xdf\xb5\xab\x7f\x75\xd7" "\xbf\x23\xf5\xd4\xa1\x7c\xcd\x6a\xae\x7f\x2b\x34\xa7\x2c\x08\x00\x00\x00" "\xb8\xa7\xa5\xf5\xef\xc0\x27\xe9\xf0\xcd\x74\x9a\x0e\x0f\x37\xbe\xc3\xbf" "\x2b\xb6\xa6\xd3\x33\xb3\x73\xcf\x9c\x9c\xb9\x70\x6e\xb2\xf1\x5d\xf9\xc1" "\xe8\x4b\x8b\x27\x5d\x03\x4d\xcf\x43\x47\xf3\x67\xc3\x45\x7e\xac\x25\x3f" "\x94\x3f\x37\xfe\xb2\x67\x4b\x3d\x3f\x3c\x31\x33\x3d\x59\x75\xf0\xd0\xe5" "\xb6\xb5\xe9\xff\x99\x3f\x7b\xaa\x6e\x1d\xb0\xee\xfc\x5e\x0b\xba\x97\xfe" "\x0f\xdd\x4b\xff\x87\xee\xa5\xff\x43\xf7\xd2\xff\xa1\x7b\x95\xf5\xff\x8f" "\x2b\x68\x07\x70\xf7\xd5\xfb\x7f\x5a\x75\x2b\x80\x2a\xd4\xfb\xff\x85\x03" "\x55\x37\x03\xa8\x80\xfb\x7f\xe8\x5e\xfa\x3f\x74\xa5\xb6\xbf\x8d\x4f\xdb" "\x17\x49\x48\xcc\x2f\x44\xba\x21\x9a\xb1\xd1\x12\xb1\x18\xd1\xb9\x37\x8c" "\xf9\x85\x33\xbd\xab\xfe\x63\x16\xb7\x97\x48\xa2\xb4\x68\xe5\xeb\x46\x72" "\xb7\x2e\x50\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\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\x77\xe8\xbf" "\x00\x00\x00\xff\xff\xc6\xbb\xdb\x9d", 1143)); NONFAILING(syz_mount_image(/*fs=*/0x20000000, /*dir=*/0x20000240, /*flags=*/0, /*opts=*/0x20000080, /*chdir=*/0x45, /*size=*/0x477, /*img=*/0x20000280)); // quotactl$Q_QUOTAON arguments: [ // cmd: quota_cmd_quota_on = 0xffffffff80000201 (8 bytes) // special: ptr[in, blockdev_filename] { // union blockdev_filename { // loop: loop_filename { // prefix: buffer: {2f 64 65 76 2f 6c 6f 6f 70} (length 0x9) // id: proc = 0x0 (1 bytes) // z: const = 0x0 (1 bytes) // } // } // } // id: uid (resource) // addr: nil // ] NONFAILING(memcpy((void*)0x20000180, "/dev/loop", 9)); NONFAILING(*(uint8_t*)0x20000189 = 0x30); NONFAILING(*(uint8_t*)0x2000018a = 0); syscall(__NR_quotactl, /*cmd=Q_QUOTAON_GRP*/ 0xffffffff80000201ul, /*special=*/0x20000180ul, /*id=*/0, /*addr=*/0ul); // mprotect arguments: [ // addr: VMA[0x3000] // len: len = 0x3000 (8 bytes) // prot: mmap_prot = 0x1 (8 bytes) // ] syscall(__NR_mprotect, /*addr=*/0x20000000ul, /*len=*/0x3000ul, /*prot=PROT_READ*/ 1ul); // openat$cgroup_ro arguments: [ // fd: fd_cgroup (resource) // file: ptr[in, buffer] { // buffer: {68 75 67 65 74 6c 62 2e 31 47 42 2e 75 73 61 67 65 5f 69 6e // 5f 62 79 74 65 73 00} (length 0x1b) // } // flags: const = 0x275a (4 bytes) // mode: const = 0x0 (2 bytes) // ] // returns fd NONFAILING(memcpy((void*)0x20000180, "hugetlb.1GB.usage_in_bytes\000", 27)); res = syscall(__NR_openat, /*fd=*/(intptr_t)-1, /*file=*/0x20000180ul, /*flags=*/0x275a, /*mode=*/0); if (res != -1) r[0] = res; // mmap arguments: [ // addr: VMA[0xb36000] // len: len = 0xb36000 (8 bytes) // prot: mmap_prot = 0xa (8 bytes) // flags: mmap_flags = 0x13 (8 bytes) // fd: fd (resource) // offset: intptr = 0x0 (8 bytes) // ] syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0xb36000ul, /*prot=PROT_SEM|PROT_WRITE*/ 0xaul, /*flags=MAP_SHARED_VALIDATE|MAP_FIXED*/ 0x13ul, /*fd=*/r[0], /*offset=*/0ul); // syz_mount_image$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 = 0x3000046 (8 bytes) // opts: ptr[in, fs_options[ext4_options]] { // fs_options[ext4_options] { // elems: array[fs_opt_elem[ext4_options]] { // fs_opt_elem[ext4_options] { // elem: union ext4_options { // delalloc: buffer: {64 65 6c 61 6c 6c 6f 63} (length 0x8) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // data_err_abort: buffer: {64 61 74 61 5f 65 72 72 3d 61 62 6f // 72 74} (length 0xe) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // barrier_val: fs_opt["barrier", fmt[hex, int32]] { // name: buffer: {62 61 72 72 69 65 72} (length 0x7) // eq: const = 0x3d (1 bytes) // val: int32 = 0x2 (18 bytes) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // dioread_lock: buffer: {64 69 6f 72 65 61 64 5f 6c 6f 63 6b} // (length 0xc) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // data_err_ignore: buffer: {64 61 74 61 5f 65 72 72 3d 69 67 6e // 6f 72 65} (length 0xf) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // max_dir_size_kb: fs_opt["max_dir_size_kb", fmt[hex, int32]] { // name: buffer: {6d 61 78 5f 64 69 72 5f 73 69 7a 65 5f 6b 62} // (length 0xf) eq: const = 0x3d (1 bytes) val: int32 = // 0x4007b1 (18 bytes) // } // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // data_err_ignore: buffer: {64 61 74 61 5f 65 72 72 3d 69 67 6e // 6f 72 65} (length 0xf) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // grpquota: buffer: {67 72 70 71 75 6f 74 61} (length 0x8) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // nobh: buffer: {6e 6f 62 68} (length 0x4) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // user_xattr: buffer: {75 73 65 72 5f 78 61 74 74 72} (length // 0xa) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // bh: buffer: {62 68} (length 0x2) // } // comma: const = 0x2c (1 bytes) // } // fs_opt_elem[ext4_options] { // elem: union ext4_options { // dioread_nolock: buffer: {64 69 6f 72 65 61 64 5f 6e 6f 6c 6f // 63 6b} (length 0xe) // } // comma: const = 0x2c (1 bytes) // } // } // common: array[fs_opt_elem[fs_options_common]] { // } // null: const = 0x0 (1 bytes) // } // } // chdir: int8 = 0x1 (1 bytes) // size: len = 0x553 (8 bytes) // img: ptr[in, buffer] { // buffer: (compressed buffer with length 0x553) // } // ] // returns fd_dir NONFAILING(memcpy((void*)0x20000040, "ext4\000", 5)); NONFAILING(memcpy((void*)0x20000000, "./file1\000", 8)); NONFAILING(memcpy((void*)0x20000380, "delalloc", 8)); NONFAILING(*(uint8_t*)0x20000388 = 0x2c); NONFAILING(memcpy((void*)0x20000389, "data_err=abort", 14)); NONFAILING(*(uint8_t*)0x20000397 = 0x2c); NONFAILING(memcpy((void*)0x20000398, "barrier", 7)); NONFAILING(*(uint8_t*)0x2000039f = 0x3d); NONFAILING(sprintf((char*)0x200003a0, "0x%016llx", (long long)2)); NONFAILING(*(uint8_t*)0x200003b2 = 0x2c); NONFAILING(memcpy((void*)0x200003b3, "dioread_lock", 12)); NONFAILING(*(uint8_t*)0x200003bf = 0x2c); NONFAILING(memcpy((void*)0x200003c0, "data_err=ignore", 15)); NONFAILING(*(uint8_t*)0x200003cf = 0x2c); NONFAILING(memcpy((void*)0x200003d0, "max_dir_size_kb", 15)); NONFAILING(*(uint8_t*)0x200003df = 0x3d); NONFAILING(sprintf((char*)0x200003e0, "0x%016llx", (long long)0x4007b1)); NONFAILING(*(uint8_t*)0x200003f2 = 0x2c); NONFAILING(memcpy((void*)0x200003f3, "data_err=ignore", 15)); NONFAILING(*(uint8_t*)0x20000402 = 0x2c); NONFAILING(memcpy((void*)0x20000403, "grpquota", 8)); NONFAILING(*(uint8_t*)0x2000040b = 0x2c); NONFAILING(memcpy((void*)0x2000040c, "nobh", 4)); NONFAILING(*(uint8_t*)0x20000410 = 0x2c); NONFAILING(memcpy((void*)0x20000411, "user_xattr", 10)); NONFAILING(*(uint8_t*)0x2000041b = 0x2c); NONFAILING(memcpy((void*)0x2000041c, "bh", 2)); NONFAILING(*(uint8_t*)0x2000041e = 0x2c); NONFAILING(memcpy((void*)0x2000041f, "dioread_nolock", 14)); NONFAILING(*(uint8_t*)0x2000042d = 0x2c); NONFAILING(*(uint8_t*)0x2000042e = 0); NONFAILING(memcpy( (void*)0x20000a40, "\x78\x9c\xec\xdd\xdf\x6b\x5b\x55\x1c\x00\xf0\xef\x4d\xdb\xfd\xd6\x75\x30" "\x86\x8a\x48\x61\x0f\x4e\xe6\xd2\xb5\xf5\xc7\x04\x1f\xe6\xa3\xe8\x70\xa0" "\xef\x33\xb4\x77\x65\x34\x59\x46\x93\x8e\xb5\x0e\xdc\x1e\xdc\x8b\x2f\x32" "\x04\x11\x07\xe2\xbb\xbe\xfb\x38\xfc\x07\xfc\x2b\x06\x3a\x18\x32\x8a\x3e" "\xf8\x12\xb9\xe9\x4d\x97\xad\x49\x9b\x75\xd9\xd2\x99\xcf\x07\x6e\x39\x27" "\xf7\x26\xe7\x7e\x73\xef\xf7\xf4\xdc\x9c\x1b\x12\xc0\xd0\x9a\xc8\xfe\x14" "\x22\x5e\x8e\x88\x6f\x92\x88\x83\x11\x91\xe4\xeb\x46\x23\x5f\x39\xb1\xb6" "\xdd\xea\xfd\xab\xb3\xd9\x92\x44\xa3\xf1\xe9\x5f\x49\x73\xbb\xac\xde\x7a" "\xad\xd6\xf3\xf6\xe7\x95\x97\x22\xe2\xb7\xaf\x22\x8e\x17\x36\xb6\x5b\x5b" "\x5e\x59\x28\x95\xcb\xe9\x62\x5e\x9f\xac\x57\x2e\x4d\xd6\x96\x57\x4e\x5c" "\xa8\x94\xe6\xd3\xf9\xf4\xe2\xf4\xcc\xcc\xa9\xb7\x67\xa6\xdf\x7b\xf7\x9d" "\xbe\xc5\xfa\xc6\xd9\x7f\xbe\xff\xe4\xf6\x87\xa7\xbe\x3e\xba\xfa\xdd\x2f" "\x77\x0f\xdd\x4c\xe2\x74\x1c\xc8\xd7\xb5\xc7\xf1\x04\xae\xb5\x57\x26\x62" "\x22\x7f\x4f\xc6\xe2\xf4\x23\x1b\x4e\xf5\xa1\xb1\x9d\x24\x19\xf4\x0e\xb0" "\x2d\x23\x79\x9e\x8f\x45\xd6\x07\x1c\x8c\x91\x3c\xeb\x81\xff\xbf\x2f\x23" "\xa2\x01\x0c\xa9\x44\xfe\xc3\x90\x6a\x8d\x03\x5a\xd7\xf6\x7d\xba\x0e\x7e" "\x6e\xdc\xfb\x60\xed\x02\x68\x63\xfc\xa3\x6b\x9f\x8d\xc4\x9e\xe6\xb5\xd1" "\xbe\xd5\xe4\xa1\x2b\xa3\xec\x7a\x77\xbc\x0f\xed\x67\x6d\xfc\xfa\xe7\xad" "\x9b\xd9\x12\xfd\xfb\x1c\x02\x60\x4b\xd7\xae\x47\xc4\xc9\xd1\xd1\x8d\xfd" "\x5f\x92\xf7\x7f\xdb\x77\xb2\x87\x6d\x1e\x6d\x43\xff\x07\xcf\xce\xed\x6c" "\xfc\xf3\x66\xa7\xf1\x4f\x61\x7d\xfc\x13\x1d\xc6\x3f\xfb\x3b\xe4\xee\x76" "\x6c\x9d\xff\x85\xbb\x7d\x68\xa6\xab\x6c\xfc\xf7\x7e\xc7\xf1\xef\xfa\xa4" "\xd5\xf8\x48\x5e\x7b\xa1\x39\xe6\x1b\x4b\xce\x5f\x28\xa7\x59\xdf\xf6\x62" "\x44\x1c\x8b\xb1\xdd\x59\x7d\xb3\xf9\x9c\x53\xab\x77\x1a\xdd\xd6\xb5\x8f" "\xff\xb2\x25\x6b\xbf\x35\x16\xcc\xf7\xe3\xee\xe8\xee\x87\x9f\x33\x57\xaa" "\x97\x9e\x24\xe6\x76\xf7\xae\x47\xbc\xd2\x71\xfc\x9b\xac\x1f\xff\xa4\xc3" "\xf1\xcf\xde\x8f\xb3\x3d\xb6\x71\x24\xbd\xf5\x5a\xb7\x75\x5b\xc7\xff\x74" "\x35\x7e\x8a\x78\xbd\xe3\xf1\x7f\x30\xa3\x95\x6c\x3e\x3f\x39\xd9\x3c\x1f" "\x26\x5b\x67\xc5\x46\x7f\xdf\x38\xf2\x7b\xb7\xf6\x07\x1d\x7f\x76\xfc\xf7" "\x6d\x1e\xff\x78\xd2\x3e\x5f\x5b\x7b\xfc\x36\x7e\xdc\xf3\x6f\xda\x6d\xdd" "\x43\xf1\x47\xef\xe7\xff\xae\xe4\xb3\x66\x79\x57\xfe\xd8\x95\x52\xbd\xbe" "\x38\x15\xb1\x2b\xf9\x78\xe3\xe3\xd3\x0f\x9e\xdb\xaa\xb7\xb6\xcf\xe2\x3f" "\x76\x74\xf3\xfe\xaf\xd3\xf9\xbf\x37\x22\x3e\xef\x31\xfe\x1b\x87\x7f\x7e" "\xb5\xa7\xf8\x07\x74\xfc\xe7\x1e\xeb\xf8\x3f\x7e\xe1\xce\x47\x5f\xfc\xd0" "\xad\xfd\xde\xfa\xbf\xb7\x9a\xa5\x63\xf9\x23\xbd\xf4\x7f\xbd\xee\xe0\x93" "\xbc\x77\x00\x00\x00\x00\x00\x00\xb0\xd3\x14\x22\xe2\x40\x24\x85\xe2\x7a" "\xb9\x50\x28\x16\xd7\xee\xef\x38\x1c\xfb\x0a\xe5\x6a\xad\x7e\xfc\x7c\x75" "\xe9\xe2\x5c\x34\xbf\x2b\x3b\x1e\x63\x85\xd6\x4c\xf7\xc1\xb6\xfb\x21\xa6" "\xf2\xfb\x61\x5b\xf5\xe9\x47\xea\x33\x11\x71\x28\x22\xbe\x1d\xd9\xdb\xac" "\x17\x67\xab\xe5\xb9\x41\x07\x0f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x3b\xc4\xfe\x2e\xdf\xff\xcf\xfc\x31\x32\xe8\xbd\x03" "\x9e\x3a\x3f\xf9\x0d\xc3\x6b\xcb\xfc\xef\xc7\x2f\x3d\x01\x3b\x92\xff\xff" "\x30\xbc\xe4\x3f\x0c\x2f\xf9\x0f\xc3\x4b\xfe\xc3\xf0\x92\xff\x30\xbc\xe4" "\x3f\x0c\x2f\xf9\x0f\xc3\x4b\xfe\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x40\x5f\x9d\x3d\x73\x26\x5b" "\x1a\xab\xf7\xaf\xce\x66\xf5\xb9\xcb\xcb\x4b\x0b\xd5\xcb\x27\xe6\xd2\xda" "\x42\xb1\xb2\x34\x5b\x9c\xad\x2e\x5e\x2a\xce\x57\xab\xf3\xe5\xb4\x38\x5b" "\xad\x6c\xf5\x7a\xe5\x6a\xf5\xd2\xd4\x74\x2c\x5d\x99\xac\xa7\xb5\xfa\x64" "\x6d\x79\xe5\x5c\xa5\xba\x74\xb1\x7e\xee\x42\xa5\x34\x9f\x9e\x4b\xc7\x9e" "\x49\x54\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf0" "\x7c\xa9\x2d\xaf\x2c\x94\xca\xe5\x74\x51\x41\x61\x5b\x85\xd1\x9d\xb1\x1b" "\x0a\x7d\x2e\x0c\xba\x67\x02\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\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\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\x80\x07\xfe\x0b\x00\x00\xff\xff\xe8\x06\x37\xb1", 1363)); NONFAILING(syz_mount_image( /*fs=*/0x20000040, /*dir=*/0x20000000, /*flags=MS_LAZYTIME|MS_STRICTATIME|MS_NOSUID|MS_NODEV|MS_MANDLOCK*/ 0x3000046, /*opts=*/0x20000380, /*chdir=*/1, /*size=*/0x553, /*img=*/0x20000a40)); // openat arguments: [ // fd: fd_dir (resource) // file: ptr[in, buffer] { // buffer: {2e 2f 66 69 6c 65 31 00} (length 0x8) // } // flags: open_flags = 0x42 (4 bytes) // mode: open_mode = 0x0 (2 bytes) // ] // returns fd NONFAILING(memcpy((void*)0x20000040, "./file1\000", 8)); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000040ul, /*flags=O_CREAT|O_RDWR*/ 0x42, /*mode=*/0); if (res != -1) r[1] = res; // pwrite64 arguments: [ // fd: fd (resource) // buf: ptr[in, buffer] { // buffer: {32} (length 0x1) // } // count: len = 0x1 (8 bytes) // pos: intptr = 0x8000c61 (8 bytes) // ] NONFAILING(memset((void*)0x20000140, 50, 1)); syscall(__NR_pwrite64, /*fd=*/r[1], /*buf=*/0x20000140ul, /*count=*/1ul, /*pos=*/0x8000c61ul); return 0; }