// https://syzkaller.appspot.com/bug?id=34609cfe6372880778d0c8d170ba5dc2ffd99741 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { unsigned long nb = a1; char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(nb % 10); nb /= 10; } return open(buf, a2 & ~O_CREAT, 0); } } uint64_t r[1] = {0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*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=*/0x200001000000ul, /*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_open_dev$tty20 arguments: [ // dev: const = 0xc (8 bytes) // major: const = 0x4 (8 bytes) // minor: proc = 0x0 (8 bytes) // ] // returns fd_tty res = -1; res = syz_open_dev(/*dev=*/0xc, /*major=*/4, /*minor=*/0x14); if (res != -1) r[0] = res; // ioctl$TIOCSETD arguments: [ // fd: fd_tty (resource) // cmd: const = 0x5423 (4 bytes) // arg: ptr[in, int32] { // int32 = 0x15 (4 bytes) // } // ] *(uint32_t*)0x200000000040 = 0x15; syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x5423, /*arg=*/0x200000000040ul); // writev arguments: [ // fd: fd (resource) // vec: ptr[in, array[iovec[in, array[int8]]]] { // array[iovec[in, array[int8]]] { // iovec[in, array[int8]] { // addr: ptr[in, buffer] { // buffer: {83 fc 8b 84 1d 07 3a 98 05 5c 26 9b 9c 7f 8b f7 e3 f0 // 9b d3 b7 2f 4d 52 93 78 48 fd 38 66 19 e9 16 18 6d 47 d6 e4 2d // 86 2c 63 5f d6 54 7e bc 2b 11 d4 a8 d3 c0 e6 60 0d 32 0e dc d1 // ac 61 73 b2 5e 7f ac da 94 3a 59 62 94 c8 38 24 5f d7 8c 9e 9e // 40 e1 03 7f 4f d1 c7 de a8 75 24 f1 75 fd 0c 6f cb 75 91 a7 57 // bc 2c 37 41 fd f2 b7 9b 44 68 27 61 b4 1d 97 3c 05 f2 1b f6 bc // 15 24 55 01 93 54 83 dc 5a 81 01 f9 f9 f8 8f 76 71 a3 d1 fe 07 // 87 82} (length 0x92) // } // len: len = 0x92 (8 bytes) // } // iovec[in, array[int8]] { // addr: nil // len: len = 0x0 (8 bytes) // } // iovec[in, array[int8]] { // addr: nil // len: len = 0x0 (8 bytes) // } // iovec[in, array[int8]] { // addr: nil // len: len = 0x0 (8 bytes) // } // } // } // vlen: len = 0x4 (8 bytes) // ] *(uint64_t*)0x200000000400 = 0x200000000180; memcpy((void*)0x200000000180, "\x83\xfc\x8b\x84\x1d\x07\x3a\x98\x05\x5c\x26\x9b\x9c\x7f\x8b\xf7\xe3" "\xf0\x9b\xd3\xb7\x2f\x4d\x52\x93\x78\x48\xfd\x38\x66\x19\xe9\x16\x18" "\x6d\x47\xd6\xe4\x2d\x86\x2c\x63\x5f\xd6\x54\x7e\xbc\x2b\x11\xd4\xa8" "\xd3\xc0\xe6\x60\x0d\x32\x0e\xdc\xd1\xac\x61\x73\xb2\x5e\x7f\xac\xda" "\x94\x3a\x59\x62\x94\xc8\x38\x24\x5f\xd7\x8c\x9e\x9e\x40\xe1\x03\x7f" "\x4f\xd1\xc7\xde\xa8\x75\x24\xf1\x75\xfd\x0c\x6f\xcb\x75\x91\xa7\x57" "\xbc\x2c\x37\x41\xfd\xf2\xb7\x9b\x44\x68\x27\x61\xb4\x1d\x97\x3c\x05" "\xf2\x1b\xf6\xbc\x15\x24\x55\x01\x93\x54\x83\xdc\x5a\x81\x01\xf9\xf9" "\xf8\x8f\x76\x71\xa3\xd1\xfe\x07\x87\x82", 146); *(uint64_t*)0x200000000408 = 0x92; *(uint64_t*)0x200000000410 = 0; *(uint64_t*)0x200000000418 = 0; *(uint64_t*)0x200000000420 = 0; *(uint64_t*)0x200000000428 = 0; *(uint64_t*)0x200000000430 = 0; *(uint64_t*)0x200000000438 = 0; syscall(__NR_writev, /*fd=*/r[0], /*vec=*/0x200000000400ul, /*vlen=*/4ul); return 0; }