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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2016 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <sudoers.h>
struct sudoers_gc_entry {
SLIST_ENTRY(sudoers_gc_entry) entries;
enum sudoers_gc_types type;
union {
char **vec;
void *ptr;
} u;
};
SLIST_HEAD(sudoers_gc_list, sudoers_gc_entry);
#ifdef NO_LEAKS
static struct sudoers_gc_list sudoers_gc_list =
SLIST_HEAD_INITIALIZER(sudoers_gc_list);
#endif
bool
sudoers_gc_add(enum sudoers_gc_types type, void *v)
{
#ifdef NO_LEAKS
struct sudoers_gc_entry *gc;
debug_decl(sudoers_gc_add, SUDOERS_DEBUG_UTIL);
if (v == NULL)
debug_return_bool(false);
gc = calloc(1, sizeof(*gc));
if (gc == NULL) {
sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
debug_return_bool(false);
}
switch (type) {
case GC_PTR:
gc->u.ptr = v;
break;
case GC_VECTOR:
gc->u.vec = v;
break;
default:
free(gc);
sudo_warnx("unexpected garbage type %d", type);
debug_return_bool(false);
}
gc->type = type;
SLIST_INSERT_HEAD(&sudoers_gc_list, gc, entries);
debug_return_bool(true);
#else
return true;
#endif /* NO_LEAKS */
}
bool
sudoers_gc_remove(enum sudoers_gc_types type, void *v)
{
#ifdef NO_LEAKS
struct sudoers_gc_entry *gc, *prev = NULL;
debug_decl(sudoers_gc_remove, SUDOERS_DEBUG_UTIL);
if (v == NULL)
debug_return_bool(false);
SLIST_FOREACH(gc, &sudoers_gc_list, entries) {
switch (gc->type) {
case GC_PTR:
if (gc->u.ptr == v)
goto found;
break;
case GC_VECTOR:
if (gc->u.vec == v)
goto found;
break;
default:
sudo_warnx("unexpected garbage type %d in %p", gc->type, gc);
}
prev = gc;
}
/* If this happens, there is a bug in the g/c code. */
sudo_warnx("%s: unable to find %p, type %d", __func__, v, type);
#ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
abort();
#else
debug_return_bool(false);
#endif
found:
if (prev == NULL)
SLIST_REMOVE_HEAD(&sudoers_gc_list, entries);
else
SLIST_REMOVE_AFTER(prev, entries);
free(gc);
debug_return_bool(true);
#else
return true;
#endif /* NO_LEAKS */
}
void
sudoers_gc_run(void)
{
#ifdef NO_LEAKS
struct sudoers_gc_entry *gc;
char **cur;
debug_decl(sudoers_gc_run, SUDOERS_DEBUG_UTIL);
/* Collect garbage. */
while ((gc = SLIST_FIRST(&sudoers_gc_list)) != NULL) {
SLIST_REMOVE_HEAD(&sudoers_gc_list, entries);
switch (gc->type) {
case GC_PTR:
free(gc->u.ptr);
free(gc);
break;
case GC_VECTOR:
for (cur = gc->u.vec; *cur != NULL; cur++)
free(*cur);
free(gc->u.vec);
free(gc);
break;
default:
sudo_warnx("unexpected garbage type %d", gc->type);
}
}
debug_return;
#endif /* NO_LEAKS */
}
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