1 /* 2 * Check decoding of non-NUL-terminated strings when len == -1. 3 * 4 * Copyright (c) 2016 Dmitry V. Levin <ldv (at) altlinux.org> 5 * Copyright (c) 2016-2017 The strace developers. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #include "tests.h" 32 33 #include <stdio.h> 34 #include <string.h> 35 #include <unistd.h> 36 #include <sys/uio.h> 37 38 int 39 main(void) 40 { 41 char *const buf = tail_alloc(DEFAULT_STRLEN + 1); 42 struct iovec io = { 43 .iov_base = buf, 44 .iov_len = -1 45 }; 46 int rc; 47 48 buf[0] = 0; 49 50 tprintf("%s", ""); 51 52 memset(buf + 1, 'X', DEFAULT_STRLEN); 53 buf[DEFAULT_STRLEN - 1] = 0; 54 55 rc = writev(-1, &io, 1); 56 tprintf("writev(-1, [{iov_base=\"\\0%*s\\0\"..., iov_len=%lu}], 1)" 57 " = %s\n", DEFAULT_STRLEN - 2, buf + 1, -1UL, sprintrc(rc)); 58 59 buf[DEFAULT_STRLEN - 1] = 'X'; 60 buf[DEFAULT_STRLEN] = 0; 61 62 rc = writev(-1, &io, 1); 63 tprintf("writev(-1, [{iov_base=\"\\0%*s\"..., iov_len=%lu}], 1)" 64 " = %s\n", DEFAULT_STRLEN - 1, buf + 1, -1UL, sprintrc(rc)); 65 66 ++io.iov_base; 67 rc = writev(-1, &io, 1); 68 tprintf("writev(-1, [{iov_base=%p, iov_len=%lu}], 1) = %s\n", 69 io.iov_base, -1UL, sprintrc(rc)); 70 71 tprintf("+++ exited with 0 +++\n"); 72 return 0; 73 } 74
