shadow/libmisc/list.c

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/*
* SPDX-FileCopyrightText: 1991 - 1994, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#ident "$Id$"
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#include <assert.h>
#include "prototypes.h"
#include "defines.h"
/*
* add_list - add a member to a list of group members
*
* the array of member names is searched for the new member
* name, and if not present it is added to a freshly allocated
* list of users.
*/
/*@only@*/ /*@out@*/char **add_list (/*@returned@*/ /*@only@*/char **list, const char *member)
{
int i;
char **tmp;
assert (NULL != member);
assert (NULL != list);
/*
* Scan the list for the new name. Return the original list
* pointer if it is present.
*/
for (i = 0; list[i] != NULL; i++) {
if (strcmp (list[i], member) == 0) {
return list;
}
}
/*
* Allocate a new list pointer large enough to hold all the
* old entries, and the new entries as well.
*/
tmp = (char **) xmalloc ((i + 2) * sizeof member);
/*
* Copy the original list to the new list, then append the
* new member and NULL terminate the result. This new list
* is returned to the invoker.
*/
for (i = 0; list[i] != NULL; i++) {
tmp[i] = list[i];
}
tmp[i] = xstrdup (member);
tmp[i+1] = NULL;
return tmp;
}
/*
* del_list - delete a member from a list of group members
*
* the array of member names is searched for the old member
* name, and if present it is deleted from a freshly allocated
* list of users.
*/
/*@only@*/ /*@out@*/char **del_list (/*@returned@*/ /*@only@*/char **list, const char *member)
{
int i, j;
char **tmp;
assert (NULL != member);
assert (NULL != list);
/*
* Scan the list for the old name. Return the original list
* pointer if it is not present.
*/
for (i = j = 0; list[i] != NULL; i++) {
if (strcmp (list[i], member) != 0) {
j++;
}
}
if (j == i) {
return list;
}
/*
* Allocate a new list pointer large enough to hold all the
* old entries.
*/
tmp = (char **) xmalloc ((j + 1) * sizeof member);
/*
* Copy the original list except the deleted members to the
* new list, then NULL terminate the result. This new list
* is returned to the invoker.
*/
for (i = j = 0; list[i] != NULL; i++) {
if (strcmp (list[i], member) != 0) {
tmp[j] = list[i];
j++;
}
}
tmp[j] = NULL;
return tmp;
}
/*
* Duplicate a list.
* The input list is not modified, but in order to allow the use of this
* function with list of members, the list elements are not enforced to be
* constant strings here.
*/
/*@only@*/ /*@out@*/char **dup_list (char *const *list)
{
int i;
char **tmp;
assert (NULL != list);
for (i = 0; NULL != list[i]; i++);
tmp = (char **) xmalloc ((i + 1) * sizeof (char *));
i = 0;
while (NULL != *list) {
tmp[i] = xstrdup (*list);
i++;
list++;
}
tmp[i] = NULL;
return tmp;
}
/*
* Check if member is part of the input list
* The input list is not modified, but in order to allow the use of this
* function with list of members, the list elements are not enforced to be
* constant strings here.
*/
bool is_on_list (char *const *list, const char *member)
{
assert (NULL != member);
assert (NULL != list);
while (NULL != *list) {
if (strcmp (*list, member) == 0) {
return true;
}
list++;
}
return false;
}
/*
* comma_to_list - convert comma-separated list to (char *) array
*/
/*@only@*/char **comma_to_list (const char *comma)
{
char *members;
char **array;
int i;
char *cp;
char *cp2;
assert (NULL != comma);
/*
* Make a copy since we are going to be modifying the list
*/
members = xstrdup (comma);
/*
* Count the number of commas in the list
*/
for (cp = members, i = 0;; i++) {
cp2 = strchr (cp, ',');
if (NULL != cp2) {
cp = cp2 + 1;
} else {
break;
}
}
/*
* Add 2 - one for the ending NULL, the other for the last item
*/
i += 2;
/*
* Allocate the array we're going to store the pointers into.
*/
array = (char **) xmalloc (sizeof (char *) * i);
/*
* Empty list is special - 0 members, not 1 empty member. --marekm
*/
if ('\0' == *members) {
*array = NULL;
Fix covscan RESOURCE_LEAK Error: RESOURCE_LEAK (CWE-772): [#def1] shadow-4.8.1/lib/commonio.c:320: alloc_fn: Storage is returned from allocation function "fopen_set_perms". shadow-4.8.1/lib/commonio.c:320: var_assign: Assigning: "bkfp" = storage returned from "fopen_set_perms(backup, "w", &sb)". shadow-4.8.1/lib/commonio.c:329: noescape: Resource "bkfp" is not freed or pointed-to in "putc". shadow-4.8.1/lib/commonio.c:334: noescape: Resource "bkfp" is not freed or pointed-to in "fflush". shadow-4.8.1/lib/commonio.c:339: noescape: Resource "bkfp" is not freed or pointed-to in "fileno". shadow-4.8.1/lib/commonio.c:342: leaked_storage: Variable "bkfp" going out of scope leaks the storage it points to. 340| || (fclose (bkfp) != 0)) { 341| /* FIXME: unlink the backup file? */ 342|-> return -1; 343| } 344| Error: RESOURCE_LEAK (CWE-772): [#def2] shadow-4.8.1/libmisc/addgrps.c:69: alloc_fn: Storage is returned from allocation function "malloc". shadow-4.8.1/libmisc/addgrps.c:69: var_assign: Assigning: "grouplist" = storage returned from "malloc(i * 4UL)". shadow-4.8.1/libmisc/addgrps.c:73: noescape: Resource "grouplist" is not freed or pointed-to in "getgroups". [Note: The source code implementation of the function has been overridden by a builtin model.] shadow-4.8.1/libmisc/addgrps.c:126: leaked_storage: Variable "grouplist" going out of scope leaks the storage it points to. 124| } 125| 126|-> return 0; 127| } 128| #else /* HAVE_SETGROUPS && !USE_PAM */ Error: RESOURCE_LEAK (CWE-772): [#def3] shadow-4.8.1/libmisc/chowntty.c:62: alloc_fn: Storage is returned from allocation function "getgr_nam_gid". shadow-4.8.1/libmisc/chowntty.c:62: var_assign: Assigning: "grent" = storage returned from "getgr_nam_gid(getdef_str("TTYGROUP"))". shadow-4.8.1/libmisc/chowntty.c:98: leaked_storage: Variable "grent" going out of scope leaks the storage it points to. 96| */ 97| #endif 98|-> } 99| Error: RESOURCE_LEAK (CWE-772): [#def4] shadow-4.8.1/libmisc/copydir.c:742: open_fn: Returning handle opened by "open". [Note: The source code implementation of the function has been overridden by a user model.] shadow-4.8.1/libmisc/copydir.c:742: var_assign: Assigning: "ifd" = handle returned from "open(src, 0)". shadow-4.8.1/libmisc/copydir.c:748: leaked_handle: Handle variable "ifd" going out of scope leaks the handle. 746| #ifdef WITH_SELINUX 747| if (set_selinux_file_context (dst, NULL) != 0) { 748|-> return -1; 749| } 750| #endif /* WITH_SELINUX */ Error: RESOURCE_LEAK (CWE-772): [#def5] shadow-4.8.1/libmisc/copydir.c:751: open_fn: Returning handle opened by "open". [Note: The source code implementation of the function has been overridden by a user model.] shadow-4.8.1/libmisc/copydir.c:751: var_assign: Assigning: "ofd" = handle returned from "open(dst, 577, statp->st_mode & 0xfffU)". shadow-4.8.1/libmisc/copydir.c:752: noescape: Resource "ofd" is not freed or pointed-to in "fchown_if_needed". shadow-4.8.1/libmisc/copydir.c:775: leaked_handle: Handle variable "ofd" going out of scope leaks the handle. 773| ) { 774| (void) close (ifd); 775|-> return -1; 776| } 777| Error: RESOURCE_LEAK (CWE-772): [#def7] shadow-4.8.1/libmisc/idmapping.c:188: alloc_fn: Storage is returned from allocation function "xmalloc". shadow-4.8.1/libmisc/idmapping.c:188: var_assign: Assigning: "buf" = storage returned from "xmalloc(bufsize)". shadow-4.8.1/libmisc/idmapping.c:188: var_assign: Assigning: "pos" = "buf". shadow-4.8.1/libmisc/idmapping.c:213: noescape: Resource "buf" is not freed or pointed-to in "write". shadow-4.8.1/libmisc/idmapping.c:219: leaked_storage: Variable "pos" going out of scope leaks the storage it points to. shadow-4.8.1/libmisc/idmapping.c:219: leaked_storage: Variable "buf" going out of scope leaks the storage it points to. 217| } 218| close(fd); 219|-> } Error: RESOURCE_LEAK (CWE-772): [#def8] shadow-4.8.1/libmisc/list.c:211: alloc_fn: Storage is returned from allocation function "xstrdup". shadow-4.8.1/libmisc/list.c:211: var_assign: Assigning: "members" = storage returned from "xstrdup(comma)". shadow-4.8.1/libmisc/list.c:217: var_assign: Assigning: "cp" = "members". shadow-4.8.1/libmisc/list.c:218: noescape: Resource "cp" is not freed or pointed-to in "strchr". shadow-4.8.1/libmisc/list.c:244: leaked_storage: Variable "cp" going out of scope leaks the storage it points to. shadow-4.8.1/libmisc/list.c:244: leaked_storage: Variable "members" going out of scope leaks the storage it points to. 242| if ('\0' == *members) { 243| *array = (char *) 0; 244|-> return array; 245| } 246| Error: RESOURCE_LEAK (CWE-772): [#def11] shadow-4.8.1/libmisc/myname.c:61: alloc_fn: Storage is returned from allocation function "xgetpwnam". shadow-4.8.1/libmisc/myname.c:61: var_assign: Assigning: "pw" = storage returned from "xgetpwnam(cp)". shadow-4.8.1/libmisc/myname.c:67: leaked_storage: Variable "pw" going out of scope leaks the storage it points to. 65| } 66| 67|-> return xgetpwuid (ruid); 68| } 69| Error: RESOURCE_LEAK (CWE-772): [#def12] shadow-4.8.1/libmisc/user_busy.c:260: alloc_fn: Storage is returned from allocation function "opendir". shadow-4.8.1/libmisc/user_busy.c:260: var_assign: Assigning: "task_dir" = storage returned from "opendir(task_path)". shadow-4.8.1/libmisc/user_busy.c:262: noescape: Resource "task_dir" is not freed or pointed-to in "readdir". shadow-4.8.1/libmisc/user_busy.c:278: leaked_storage: Variable "task_dir" going out of scope leaks the storage it points to. 276| _("%s: user %s is currently used by process %d\n"), 277| Prog, name, pid); 278|-> return 1; 279| } 280| } Error: RESOURCE_LEAK (CWE-772): [#def20] shadow-4.8.1/src/newgrp.c:162: alloc_fn: Storage is returned from allocation function "xgetspnam". shadow-4.8.1/src/newgrp.c:162: var_assign: Assigning: "spwd" = storage returned from "xgetspnam(pwd->pw_name)". shadow-4.8.1/src/newgrp.c:234: leaked_storage: Variable "spwd" going out of scope leaks the storage it points to. 232| } 233| 234|-> return; 235| 236| failure: Error: RESOURCE_LEAK (CWE-772): [#def21] shadow-4.8.1/src/passwd.c:530: alloc_fn: Storage is returned from allocation function "xstrdup". shadow-4.8.1/src/passwd.c:530: var_assign: Assigning: "cp" = storage returned from "xstrdup(crypt_passwd)". shadow-4.8.1/src/passwd.c:551: noescape: Resource "cp" is not freed or pointed-to in "strlen". shadow-4.8.1/src/passwd.c:554: noescape: Resource "cp" is not freed or pointed-to in "strcat". [Note: The source code implementation of the function has been overridden by a builtin model.] shadow-4.8.1/src/passwd.c:555: overwrite_var: Overwriting "cp" in "cp = newpw" leaks the storage that "cp" points to. 553| strcpy (newpw, "!"); 554| strcat (newpw, cp); 555|-> cp = newpw; 556| } 557| return cp;
2021-06-14 16:09:48 +05:30
free (members);
return array;
}
/*
* Now go walk that list all over again, this time building the
* array of pointers.
*/
for (cp = members, i = 0;; i++) {
array[i] = cp;
cp2 = strchr (cp, ',');
if (NULL != cp2) {
*cp2 = '\0';
cp2++;
cp = cp2;
} else {
array[i + 1] = NULL;
break;
}
}
/*
* Return the new array of pointers
*/
return array;
}