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linux-stable/tools/testing/radix-tree/idr-test.c
Matthew Wilcox (Oracle) a219b856a2 ida: Free allocated bitmap in error path 
If a bitmap needs to be allocated, and then by the time the thread
is scheduled to be run again all the indices which would satisfy the
allocation have been allocated then we would leak the allocation.  Almost
impossible to hit in practice, but a trivial fix.  Found by Coverity.

Fixes: f32f004cdd ("ida: Convert to XArray")
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
2020-10-07 09:11:33 -04:00

588 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* idr-test.c: Test the IDR API
* Copyright (c) 2016 Matthew Wilcox <willy@infradead.org>
*/
#include <linux/bitmap.h>
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include "test.h"
#define DUMMY_PTR ((void *)0x10)
int item_idr_free(int id, void *p, void *data)
{
struct item *item = p;
assert(item->index == id);
free(p);
return 0;
}
void item_idr_remove(struct idr *idr, int id)
{
struct item *item = idr_find(idr, id);
assert(item->index == id);
idr_remove(idr, id);
free(item);
}
void idr_alloc_test(void)
{
unsigned long i;
DEFINE_IDR(idr);
assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0, 0x4000, GFP_KERNEL) == 0);
assert(idr_alloc_cyclic(&idr, DUMMY_PTR, 0x3ffd, 0x4000, GFP_KERNEL) == 0x3ffd);
idr_remove(&idr, 0x3ffd);
idr_remove(&idr, 0);
for (i = 0x3ffe; i < 0x4003; i++) {
int id;
struct item *item;
if (i < 0x4000)
item = item_create(i, 0);
else
item = item_create(i - 0x3fff, 0);
id = idr_alloc_cyclic(&idr, item, 1, 0x4000, GFP_KERNEL);
assert(id == item->index);
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
}
void idr_replace_test(void)
{
DEFINE_IDR(idr);
idr_alloc(&idr, (void *)-1, 10, 11, GFP_KERNEL);
idr_replace(&idr, &idr, 10);
idr_destroy(&idr);
}
/*
* Unlike the radix tree, you can put a NULL pointer -- with care -- into
* the IDR. Some interfaces, like idr_find() do not distinguish between
* "present, value is NULL" and "not present", but that's exactly what some
* users want.
*/
void idr_null_test(void)
{
int i;
DEFINE_IDR(idr);
assert(idr_is_empty(&idr));
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
assert(!idr_is_empty(&idr));
idr_remove(&idr, 0);
assert(idr_is_empty(&idr));
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
assert(!idr_is_empty(&idr));
idr_destroy(&idr);
assert(idr_is_empty(&idr));
for (i = 0; i < 10; i++) {
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == i);
}
assert(idr_replace(&idr, DUMMY_PTR, 3) == NULL);
assert(idr_replace(&idr, DUMMY_PTR, 4) == NULL);
assert(idr_replace(&idr, NULL, 4) == DUMMY_PTR);
assert(idr_replace(&idr, DUMMY_PTR, 11) == ERR_PTR(-ENOENT));
idr_remove(&idr, 5);
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 5);
idr_remove(&idr, 5);
for (i = 0; i < 9; i++) {
idr_remove(&idr, i);
assert(!idr_is_empty(&idr));
}
idr_remove(&idr, 8);
assert(!idr_is_empty(&idr));
idr_remove(&idr, 9);
assert(idr_is_empty(&idr));
assert(idr_alloc(&idr, NULL, 0, 0, GFP_KERNEL) == 0);
assert(idr_replace(&idr, DUMMY_PTR, 3) == ERR_PTR(-ENOENT));
assert(idr_replace(&idr, DUMMY_PTR, 0) == NULL);
assert(idr_replace(&idr, NULL, 0) == DUMMY_PTR);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
for (i = 1; i < 10; i++) {
assert(idr_alloc(&idr, NULL, 1, 0, GFP_KERNEL) == i);
}
idr_destroy(&idr);
assert(idr_is_empty(&idr));
}
void idr_nowait_test(void)
{
unsigned int i;
DEFINE_IDR(idr);
idr_preload(GFP_KERNEL);
for (i = 0; i < 3; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, i, i + 1, GFP_NOWAIT) == i);
}
idr_preload_end();
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
}
void idr_get_next_test(int base)
{
unsigned long i;
int nextid;
DEFINE_IDR(idr);
idr_init_base(&idr, base);
int indices[] = {4, 7, 9, 15, 65, 128, 1000, 99999, 0};
for(i = 0; indices[i]; i++) {
struct item *item = item_create(indices[i], 0);
assert(idr_alloc(&idr, item, indices[i], indices[i+1],
GFP_KERNEL) == indices[i]);
}
for(i = 0, nextid = 0; indices[i]; i++) {
idr_get_next(&idr, &nextid);
assert(nextid == indices[i]);
nextid++;
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
}
int idr_u32_cb(int id, void *ptr, void *data)
{
BUG_ON(id < 0);
BUG_ON(ptr != DUMMY_PTR);
return 0;
}
void idr_u32_test1(struct idr *idr, u32 handle)
{
static bool warned = false;
u32 id = handle;
int sid = 0;
void *ptr;
BUG_ON(idr_alloc_u32(idr, DUMMY_PTR, &id, id, GFP_KERNEL));
BUG_ON(id != handle);
BUG_ON(idr_alloc_u32(idr, DUMMY_PTR, &id, id, GFP_KERNEL) != -ENOSPC);
BUG_ON(id != handle);
if (!warned && id > INT_MAX)
printk("vvv Ignore these warnings\n");
ptr = idr_get_next(idr, &sid);
if (id > INT_MAX) {
BUG_ON(ptr != NULL);
BUG_ON(sid != 0);
} else {
BUG_ON(ptr != DUMMY_PTR);
BUG_ON(sid != id);
}
idr_for_each(idr, idr_u32_cb, NULL);
if (!warned && id > INT_MAX) {
printk("^^^ Warnings over\n");
warned = true;
}
BUG_ON(idr_remove(idr, id) != DUMMY_PTR);
BUG_ON(!idr_is_empty(idr));
}
void idr_u32_test(int base)
{
DEFINE_IDR(idr);
idr_init_base(&idr, base);
idr_u32_test1(&idr, 10);
idr_u32_test1(&idr, 0x7fffffff);
idr_u32_test1(&idr, 0x80000000);
idr_u32_test1(&idr, 0x80000001);
idr_u32_test1(&idr, 0xffe00000);
idr_u32_test1(&idr, 0xffffffff);
}
static void idr_align_test(struct idr *idr)
{
char name[] = "Motorola 68000";
int i, id;
void *entry;
for (i = 0; i < 9; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0, 0, GFP_KERNEL) != i);
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 1; i < 10; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0, 0, GFP_KERNEL) != i - 1);
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 2; i < 11; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0, 0, GFP_KERNEL) != i - 2);
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 3; i < 12; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0, 0, GFP_KERNEL) != i - 3);
idr_for_each_entry(idr, entry, id);
}
idr_destroy(idr);
for (i = 0; i < 8; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0, 0, GFP_KERNEL) != 0);
BUG_ON(idr_alloc(idr, &name[i + 1], 0, 0, GFP_KERNEL) != 1);
idr_for_each_entry(idr, entry, id);
idr_remove(idr, 1);
idr_for_each_entry(idr, entry, id);
idr_remove(idr, 0);
BUG_ON(!idr_is_empty(idr));
}
for (i = 0; i < 8; i++) {
BUG_ON(idr_alloc(idr, NULL, 0, 0, GFP_KERNEL) != 0);
idr_for_each_entry(idr, entry, id);
idr_replace(idr, &name[i], 0);
idr_for_each_entry(idr, entry, id);
BUG_ON(idr_find(idr, 0) != &name[i]);
idr_remove(idr, 0);
}
for (i = 0; i < 8; i++) {
BUG_ON(idr_alloc(idr, &name[i], 0, 0, GFP_KERNEL) != 0);
BUG_ON(idr_alloc(idr, NULL, 0, 0, GFP_KERNEL) != 1);
idr_remove(idr, 1);
idr_for_each_entry(idr, entry, id);
idr_replace(idr, &name[i + 1], 0);
idr_for_each_entry(idr, entry, id);
idr_remove(idr, 0);
}
}
DEFINE_IDR(find_idr);
static void *idr_throbber(void *arg)
{
time_t start = time(NULL);
int id = *(int *)arg;
rcu_register_thread();
do {
idr_alloc(&find_idr, xa_mk_value(id), id, id + 1, GFP_KERNEL);
idr_remove(&find_idr, id);
} while (time(NULL) < start + 10);
rcu_unregister_thread();
return NULL;
}
void idr_find_test_1(int anchor_id, int throbber_id)
{
pthread_t throbber;
time_t start = time(NULL);
pthread_create(&throbber, NULL, idr_throbber, &throbber_id);
BUG_ON(idr_alloc(&find_idr, xa_mk_value(anchor_id), anchor_id,
anchor_id + 1, GFP_KERNEL) != anchor_id);
do {
int id = 0;
void *entry = idr_get_next(&find_idr, &id);
BUG_ON(entry != xa_mk_value(id));
} while (time(NULL) < start + 11);
pthread_join(throbber, NULL);
idr_remove(&find_idr, anchor_id);
BUG_ON(!idr_is_empty(&find_idr));
}
void idr_find_test(void)
{
idr_find_test_1(100000, 0);
idr_find_test_1(0, 100000);
}
void idr_checks(void)
{
unsigned long i;
DEFINE_IDR(idr);
for (i = 0; i < 10000; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, 0, 20000, GFP_KERNEL) == i);
}
assert(idr_alloc(&idr, DUMMY_PTR, 5, 30, GFP_KERNEL) < 0);
for (i = 0; i < 5000; i++)
item_idr_remove(&idr, i);
idr_remove(&idr, 3);
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
idr_remove(&idr, 3);
idr_remove(&idr, 0);
assert(idr_alloc(&idr, DUMMY_PTR, 0, 0, GFP_KERNEL) == 0);
idr_remove(&idr, 1);
for (i = 1; i < RADIX_TREE_MAP_SIZE; i++)
assert(idr_alloc(&idr, DUMMY_PTR, 0, 0, GFP_KERNEL) == i);
idr_remove(&idr, 1 << 30);
idr_destroy(&idr);
for (i = INT_MAX - 3UL; i < INT_MAX + 1UL; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, i, i + 10, GFP_KERNEL) == i);
}
assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i, GFP_KERNEL) == -ENOSPC);
assert(idr_alloc(&idr, DUMMY_PTR, i - 2, i + 10, GFP_KERNEL) == -ENOSPC);
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
idr_set_cursor(&idr, INT_MAX - 3UL);
for (i = INT_MAX - 3UL; i < INT_MAX + 3UL; i++) {
struct item *item;
unsigned int id;
if (i <= INT_MAX)
item = item_create(i, 0);
else
item = item_create(i - INT_MAX - 1, 0);
id = idr_alloc_cyclic(&idr, item, 0, 0, GFP_KERNEL);
assert(id == item->index);
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
assert(idr_is_empty(&idr));
for (i = 1; i < 10000; i++) {
struct item *item = item_create(i, 0);
assert(idr_alloc(&idr, item, 1, 20000, GFP_KERNEL) == i);
}
idr_for_each(&idr, item_idr_free, &idr);
idr_destroy(&idr);
idr_replace_test();
idr_alloc_test();
idr_null_test();
idr_nowait_test();
idr_get_next_test(0);
idr_get_next_test(1);
idr_get_next_test(4);
idr_u32_test(4);
idr_u32_test(1);
idr_u32_test(0);
idr_align_test(&idr);
idr_find_test();
}
#define module_init(x)
#define module_exit(x)
#define MODULE_AUTHOR(x)
#define MODULE_LICENSE(x)
#define dump_stack() assert(0)
void ida_dump(struct ida *);
#include "../../../lib/test_ida.c"
/*
* Check that we get the correct error when we run out of memory doing
* allocations. In userspace, GFP_NOWAIT will always fail an allocation.
* The first test is for not having a bitmap available, and the second test
* is for not being able to allocate a level of the radix tree.
*/
void ida_check_nomem(void)
{
DEFINE_IDA(ida);
int id;
id = ida_alloc_min(&ida, 256, GFP_NOWAIT);
IDA_BUG_ON(&ida, id != -ENOMEM);
id = ida_alloc_min(&ida, 1UL << 30, GFP_NOWAIT);
IDA_BUG_ON(&ida, id != -ENOMEM);
IDA_BUG_ON(&ida, !ida_is_empty(&ida));
}
/*
* Check handling of conversions between exceptional entries and full bitmaps.
*/
void ida_check_conv_user(void)
{
DEFINE_IDA(ida);
unsigned long i;
for (i = 0; i < 1000000; i++) {
int id = ida_alloc(&ida, GFP_NOWAIT);
if (id == -ENOMEM) {
IDA_BUG_ON(&ida, ((i % IDA_BITMAP_BITS) !=
BITS_PER_XA_VALUE) &&
((i % IDA_BITMAP_BITS) != 0));
id = ida_alloc(&ida, GFP_KERNEL);
} else {
IDA_BUG_ON(&ida, (i % IDA_BITMAP_BITS) ==
BITS_PER_XA_VALUE);
}
IDA_BUG_ON(&ida, id != i);
}
ida_destroy(&ida);
}
void ida_check_random(void)
{
DEFINE_IDA(ida);
DECLARE_BITMAP(bitmap, 2048);
unsigned int i;
time_t s = time(NULL);
repeat:
memset(bitmap, 0, sizeof(bitmap));
for (i = 0; i < 100000; i++) {
int i = rand();
int bit = i & 2047;
if (test_bit(bit, bitmap)) {
__clear_bit(bit, bitmap);
ida_free(&ida, bit);
} else {
__set_bit(bit, bitmap);
IDA_BUG_ON(&ida, ida_alloc_min(&ida, bit, GFP_KERNEL)
!= bit);
}
}
ida_destroy(&ida);
if (time(NULL) < s + 10)
goto repeat;
}
void ida_simple_get_remove_test(void)
{
DEFINE_IDA(ida);
unsigned long i;
for (i = 0; i < 10000; i++) {
assert(ida_simple_get(&ida, 0, 20000, GFP_KERNEL) == i);
}
assert(ida_simple_get(&ida, 5, 30, GFP_KERNEL) < 0);
for (i = 0; i < 10000; i++) {
ida_simple_remove(&ida, i);
}
assert(ida_is_empty(&ida));
ida_destroy(&ida);
}
void user_ida_checks(void)
{
radix_tree_cpu_dead(1);
ida_check_nomem();
ida_check_conv_user();
ida_check_random();
ida_simple_get_remove_test();
radix_tree_cpu_dead(1);
}
static void *ida_random_fn(void *arg)
{
rcu_register_thread();
ida_check_random();
rcu_unregister_thread();
return NULL;
}
static void *ida_leak_fn(void *arg)
{
struct ida *ida = arg;
time_t s = time(NULL);
int i, ret;
rcu_register_thread();
do for (i = 0; i < 1000; i++) {
ret = ida_alloc_range(ida, 128, 128, GFP_KERNEL);
if (ret >= 0)
ida_free(ida, 128);
} while (time(NULL) < s + 2);
rcu_unregister_thread();
return NULL;
}
void ida_thread_tests(void)
{
DEFINE_IDA(ida);
pthread_t threads[20];
int i;
for (i = 0; i < ARRAY_SIZE(threads); i++)
if (pthread_create(&threads[i], NULL, ida_random_fn, NULL)) {
perror("creating ida thread");
exit(1);
}
while (i--)
pthread_join(threads[i], NULL);
for (i = 0; i < ARRAY_SIZE(threads); i++)
if (pthread_create(&threads[i], NULL, ida_leak_fn, &ida)) {
perror("creating ida thread");
exit(1);
}
while (i--)
pthread_join(threads[i], NULL);
assert(ida_is_empty(&ida));
}
void ida_tests(void)
{
user_ida_checks();
ida_checks();
ida_exit();
ida_thread_tests();
}
int __weak main(void)
{
radix_tree_init();
idr_checks();
ida_tests();
radix_tree_cpu_dead(1);
rcu_barrier();
if (nr_allocated)
printf("nr_allocated = %d\n", nr_allocated);
return 0;
}
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