df5dafe049
The functions __gr_dup and __pw_dup do not explicitly zero the memory which hold the passwords after free. The gr_free and pw_free functions do this explicitly. To guarantee same behaviour, it's possible to call these *_free functions directly from __*_dup, because the memory is initialized with zeros at the beginning. Calling free(NULL) has no negative effect and can be considered safe these days.
107 lines
3.2 KiB
C
107 lines
3.2 KiB
C
/*
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* Copyright (c) 1990 - 1994, Julianne Frances Haugh
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* Copyright (c) 1996 - 2000, Marek Michałkiewicz
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* Copyright (c) 2001 , Michał Moskal
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* Copyright (c) 2003 - 2005, Tomasz Kłoczko
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* Copyright (c) 2007 - 2013, Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include "defines.h"
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#include "prototypes.h"
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#include "pwio.h"
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/*@null@*/ /*@only@*/struct passwd *__pw_dup (const struct passwd *pwent)
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{
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struct passwd *pw;
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pw = (struct passwd *) malloc (sizeof *pw);
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if (NULL == pw) {
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return NULL;
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}
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/* The libc might define other fields. They won't be copied. */
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memset (pw, 0, sizeof *pw);
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pw->pw_uid = pwent->pw_uid;
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pw->pw_gid = pwent->pw_gid;
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/*@-mustfreeonly@*/
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pw->pw_name = strdup (pwent->pw_name);
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/*@=mustfreeonly@*/
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if (NULL == pw->pw_name) {
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pw_free(pw);
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return NULL;
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}
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/*@-mustfreeonly@*/
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pw->pw_passwd = strdup (pwent->pw_passwd);
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/*@=mustfreeonly@*/
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if (NULL == pw->pw_passwd) {
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pw_free(pw);
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return NULL;
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}
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/*@-mustfreeonly@*/
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pw->pw_gecos = strdup (pwent->pw_gecos);
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/*@=mustfreeonly@*/
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if (NULL == pw->pw_gecos) {
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pw_free(pw);
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return NULL;
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}
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/*@-mustfreeonly@*/
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pw->pw_dir = strdup (pwent->pw_dir);
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/*@=mustfreeonly@*/
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if (NULL == pw->pw_dir) {
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pw_free(pw);
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return NULL;
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}
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/*@-mustfreeonly@*/
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pw->pw_shell = strdup (pwent->pw_shell);
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/*@=mustfreeonly@*/
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if (NULL == pw->pw_shell) {
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pw_free(pw);
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return NULL;
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}
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return pw;
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}
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void pw_free (/*@out@*/ /*@only@*/struct passwd *pwent)
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{
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free (pwent->pw_name);
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if (pwent->pw_passwd) {
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memzero (pwent->pw_passwd, strlen (pwent->pw_passwd));
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free (pwent->pw_passwd);
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}
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free (pwent->pw_gecos);
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free (pwent->pw_dir);
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free (pwent->pw_shell);
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free (pwent);
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}
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