1/* 2 * Copyright (c) 1991, 1992 Paul Kranenburg <pk@cs.few.eur.nl> 3 * Copyright (c) 1993 Branko Lankester <branko@hacktic.nl> 4 * Copyright (c) 1993-1996 Rick Sladkey <jrs@world.std.com> 5 * Copyright (c) 1996-1999 Wichert Akkerman <wichert@cistron.nl> 6 * Copyright (c) 2006 Ulrich Drepper <drepper@redhat.com> 7 * Copyright (c) 2006 Bernhard Kaindl <bk@suse.de> 8 * Copyright (c) 2006-2015 Dmitry V. Levin <ldv@altlinux.org> 9 * Copyright (c) 2014-2017 The strace developers. 10 * All rights reserved. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35#include "defs.h" 36 37static int 38decode_readlink(struct tcb *tcp, int offset) 39{ 40 if (entering(tcp)) { 41 printpath(tcp, tcp->u_arg[offset]); 42 tprints(", "); 43 } else { 44 if (syserror(tcp)) 45 printaddr(tcp->u_arg[offset + 1]); 46 else 47 /* Used to use printpathn(), but readlink 48 * neither includes NUL in the returned count, 49 * nor actually writes it into memory. 50 * printpathn() would decide on printing 51 * "..." continuation based on garbage 52 * past return buffer's end. 53 */ 54 printstrn(tcp, tcp->u_arg[offset + 1], tcp->u_rval); 55 tprintf(", %" PRI_klu, tcp->u_arg[offset + 2]); 56 } 57 return 0; 58} 59 60SYS_FUNC(readlink) 61{ 62 return decode_readlink(tcp, 0); 63} 64 65SYS_FUNC(readlinkat) 66{ 67 if (entering(tcp)) 68 print_dirfd(tcp, tcp->u_arg[0]); 69 return decode_readlink(tcp, 1); 70} 71