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linux/kernel/resource_kunit.c
Huang Ying 0665d7a39b resource, kunit: fix user-after-free in resource_test_region_intersects() 
In resource_test_insert_resource(), the pointer is used in error message
after kfree().  This is user-after-free.  To fix this, we need to call
kunit_add_action_or_reset() to schedule memory freeing after usage.  But
kunit_add_action_or_reset() itself may fail and free the memory.  So, its
return value should be checked and abort the test for failure.  Then, we
found that other usage of kunit_add_action_or_reset() in
resource_test_region_intersects() needs to be fixed too.  We fix all these
user-after-free bugs in this patch.

Link: https://lkml.kernel.org/r/20240930070611.353338-1-ying.huang@intel.com
Fixes: 99185c10d5 ("resource, kunit: add test case for region_intersects()")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Reported-by: Kees Bakker <kees@ijzerbout.nl>
Closes: https://lore.kernel.org/lkml/87ldzaotcg.fsf@yhuang6-desk2.ccr.corp.intel.com/
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-10-09 12:47:19 -07:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Test cases for API provided by resource.c and ioport.h
*/
#include <kunit/test.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/sizes.h>
#include <linux/mm.h>
#define R0_START 0x0000
#define R0_END 0xffff
#define R1_START 0x1234
#define R1_END 0x2345
#define R2_START 0x4567
#define R2_END 0x5678
#define R3_START 0x6789
#define R3_END 0x789a
#define R4_START 0x2000
#define R4_END 0x7000
static struct resource r0 = { .start = R0_START, .end = R0_END };
static struct resource r1 = { .start = R1_START, .end = R1_END };
static struct resource r2 = { .start = R2_START, .end = R2_END };
static struct resource r3 = { .start = R3_START, .end = R3_END };
static struct resource r4 = { .start = R4_START, .end = R4_END };
struct result {
struct resource *r1;
struct resource *r2;
struct resource r;
bool ret;
};
static struct result results_for_union[] = {
{
.r1 = &r1, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
}, {
.r1 = &r2, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
}, {
.r1 = &r3, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
}, {
.r1 = &r4, .r2 = &r0, .r.start = R0_START, .r.end = R0_END, .ret = true,
}, {
.r1 = &r2, .r2 = &r1, .ret = false,
}, {
.r1 = &r3, .r2 = &r1, .ret = false,
}, {
.r1 = &r4, .r2 = &r1, .r.start = R1_START, .r.end = R4_END, .ret = true,
}, {
.r1 = &r2, .r2 = &r3, .ret = false,
}, {
.r1 = &r2, .r2 = &r4, .r.start = R4_START, .r.end = R4_END, .ret = true,
}, {
.r1 = &r3, .r2 = &r4, .r.start = R4_START, .r.end = R3_END, .ret = true,
},
};
static struct result results_for_intersection[] = {
{
.r1 = &r1, .r2 = &r0, .r.start = R1_START, .r.end = R1_END, .ret = true,
}, {
.r1 = &r2, .r2 = &r0, .r.start = R2_START, .r.end = R2_END, .ret = true,
}, {
.r1 = &r3, .r2 = &r0, .r.start = R3_START, .r.end = R3_END, .ret = true,
}, {
.r1 = &r4, .r2 = &r0, .r.start = R4_START, .r.end = R4_END, .ret = true,
}, {
.r1 = &r2, .r2 = &r1, .ret = false,
}, {
.r1 = &r3, .r2 = &r1, .ret = false,
}, {
.r1 = &r4, .r2 = &r1, .r.start = R4_START, .r.end = R1_END, .ret = true,
}, {
.r1 = &r2, .r2 = &r3, .ret = false,
}, {
.r1 = &r2, .r2 = &r4, .r.start = R2_START, .r.end = R2_END, .ret = true,
}, {
.r1 = &r3, .r2 = &r4, .r.start = R3_START, .r.end = R4_END, .ret = true,
},
};
static void resource_do_test(struct kunit *test, bool ret, struct resource *r,
bool exp_ret, struct resource *exp_r,
struct resource *r1, struct resource *r2)
{
KUNIT_EXPECT_EQ_MSG(test, ret, exp_ret, "Resources %pR %pR", r1, r2);
KUNIT_EXPECT_EQ_MSG(test, r->start, exp_r->start, "Start elements are not equal");
KUNIT_EXPECT_EQ_MSG(test, r->end, exp_r->end, "End elements are not equal");
}
static void resource_do_union_test(struct kunit *test, struct result *r)
{
struct resource result;
bool ret;
memset(&result, 0, sizeof(result));
ret = resource_union(r->r1, r->r2, &result);
resource_do_test(test, ret, &result, r->ret, &r->r, r->r1, r->r2);
memset(&result, 0, sizeof(result));
ret = resource_union(r->r2, r->r1, &result);
resource_do_test(test, ret, &result, r->ret, &r->r, r->r2, r->r1);
}
static void resource_test_union(struct kunit *test)
{
struct result *r = results_for_union;
unsigned int i = 0;
do {
resource_do_union_test(test, &r[i]);
} while (++i < ARRAY_SIZE(results_for_union));
}
static void resource_do_intersection_test(struct kunit *test, struct result *r)
{
struct resource result;
bool ret;
memset(&result, 0, sizeof(result));
ret = resource_intersection(r->r1, r->r2, &result);
resource_do_test(test, ret, &result, r->ret, &r->r, r->r1, r->r2);
memset(&result, 0, sizeof(result));
ret = resource_intersection(r->r2, r->r1, &result);
resource_do_test(test, ret, &result, r->ret, &r->r, r->r2, r->r1);
}
static void resource_test_intersection(struct kunit *test)
{
struct result *r = results_for_intersection;
unsigned int i = 0;
do {
resource_do_intersection_test(test, &r[i]);
} while (++i < ARRAY_SIZE(results_for_intersection));
}
/*
* The test resource tree for region_intersects() test:
*
* BASE-BASE+1M-1 : Test System RAM 0
* # hole 0 (BASE+1M-BASE+2M)
* BASE+2M-BASE+3M-1 : Test CXL Window 0
* BASE+3M-BASE+4M-1 : Test System RAM 1
* BASE+4M-BASE+7M-1 : Test CXL Window 1
* BASE+4M-BASE+5M-1 : Test System RAM 2
* BASE+4M+128K-BASE+4M+256K-1: Test Code
* BASE+5M-BASE+6M-1 : Test System RAM 3
*/
#define RES_TEST_RAM0_OFFSET 0
#define RES_TEST_RAM0_SIZE SZ_1M
#define RES_TEST_HOLE0_OFFSET (RES_TEST_RAM0_OFFSET + RES_TEST_RAM0_SIZE)
#define RES_TEST_HOLE0_SIZE SZ_1M
#define RES_TEST_WIN0_OFFSET (RES_TEST_HOLE0_OFFSET + RES_TEST_HOLE0_SIZE)
#define RES_TEST_WIN0_SIZE SZ_1M
#define RES_TEST_RAM1_OFFSET (RES_TEST_WIN0_OFFSET + RES_TEST_WIN0_SIZE)
#define RES_TEST_RAM1_SIZE SZ_1M
#define RES_TEST_WIN1_OFFSET (RES_TEST_RAM1_OFFSET + RES_TEST_RAM1_SIZE)
#define RES_TEST_WIN1_SIZE (SZ_1M * 3)
#define RES_TEST_RAM2_OFFSET RES_TEST_WIN1_OFFSET
#define RES_TEST_RAM2_SIZE SZ_1M
#define RES_TEST_CODE_OFFSET (RES_TEST_RAM2_OFFSET + SZ_128K)
#define RES_TEST_CODE_SIZE SZ_128K
#define RES_TEST_RAM3_OFFSET (RES_TEST_RAM2_OFFSET + RES_TEST_RAM2_SIZE)
#define RES_TEST_RAM3_SIZE SZ_1M
#define RES_TEST_TOTAL_SIZE ((RES_TEST_WIN1_OFFSET + RES_TEST_WIN1_SIZE))
KUNIT_DEFINE_ACTION_WRAPPER(kfree_wrapper, kfree, const void *);
static void remove_free_resource(void *ctx)
{
struct resource *res = (struct resource *)ctx;
remove_resource(res);
kfree(res);
}
static void resource_test_add_action_or_abort(
struct kunit *test, void (*action)(void *), void *ctx)
{
KUNIT_ASSERT_EQ_MSG(test, 0,
kunit_add_action_or_reset(test, action, ctx),
"Fail to add action");
}
static void resource_test_request_region(struct kunit *test, struct resource *parent,
resource_size_t start, resource_size_t size,
const char *name, unsigned long flags)
{
struct resource *res;
res = __request_region(parent, start, size, name, flags);
KUNIT_ASSERT_NOT_NULL(test, res);
resource_test_add_action_or_abort(test, remove_free_resource, res);
}
static void resource_test_insert_resource(struct kunit *test, struct resource *parent,
resource_size_t start, resource_size_t size,
const char *name, unsigned long flags)
{
struct resource *res;
res = kzalloc(sizeof(*res), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, res);
res->name = name;
res->start = start;
res->end = start + size - 1;
res->flags = flags;
if (insert_resource(parent, res)) {
resource_test_add_action_or_abort(test, kfree_wrapper, res);
KUNIT_FAIL_AND_ABORT(test, "Fail to insert resource %pR\n", res);
}
resource_test_add_action_or_abort(test, remove_free_resource, res);
}
static void resource_test_region_intersects(struct kunit *test)
{
unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
struct resource *parent;
resource_size_t start;
/* Find an iomem_resource hole to hold test resources */
parent = alloc_free_mem_region(&iomem_resource, RES_TEST_TOTAL_SIZE, SZ_1M,
"test resources");
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
start = parent->start;
resource_test_add_action_or_abort(test, remove_free_resource, parent);
resource_test_request_region(test, parent, start + RES_TEST_RAM0_OFFSET,
RES_TEST_RAM0_SIZE, "Test System RAM 0", flags);
resource_test_insert_resource(test, parent, start + RES_TEST_WIN0_OFFSET,
RES_TEST_WIN0_SIZE, "Test CXL Window 0",
IORESOURCE_MEM);
resource_test_request_region(test, parent, start + RES_TEST_RAM1_OFFSET,
RES_TEST_RAM1_SIZE, "Test System RAM 1", flags);
resource_test_insert_resource(test, parent, start + RES_TEST_WIN1_OFFSET,
RES_TEST_WIN1_SIZE, "Test CXL Window 1",
IORESOURCE_MEM);
resource_test_request_region(test, parent, start + RES_TEST_RAM2_OFFSET,
RES_TEST_RAM2_SIZE, "Test System RAM 2", flags);
resource_test_insert_resource(test, parent, start + RES_TEST_CODE_OFFSET,
RES_TEST_CODE_SIZE, "Test Code", flags);
resource_test_request_region(test, parent, start + RES_TEST_RAM3_OFFSET,
RES_TEST_RAM3_SIZE, "Test System RAM 3", flags);
kunit_release_action(test, remove_free_resource, parent);
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM0_OFFSET, PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM0_OFFSET +
RES_TEST_RAM0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_DISJOINT,
region_intersects(start + RES_TEST_HOLE0_OFFSET, PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_DISJOINT,
region_intersects(start + RES_TEST_HOLE0_OFFSET +
RES_TEST_HOLE0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_MIXED,
region_intersects(start + RES_TEST_WIN0_OFFSET +
RES_TEST_WIN0_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM1_OFFSET +
RES_TEST_RAM1_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM2_OFFSET +
RES_TEST_RAM2_SIZE - PAGE_SIZE, 2 * PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_CODE_OFFSET, PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_INTERSECTS,
region_intersects(start + RES_TEST_RAM2_OFFSET,
RES_TEST_RAM2_SIZE + PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
KUNIT_EXPECT_EQ(test, REGION_MIXED,
region_intersects(start + RES_TEST_RAM3_OFFSET,
RES_TEST_RAM3_SIZE + PAGE_SIZE,
IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE));
}
static struct kunit_case resource_test_cases[] = {
KUNIT_CASE(resource_test_union),
KUNIT_CASE(resource_test_intersection),
KUNIT_CASE(resource_test_region_intersects),
{}
};
static struct kunit_suite resource_test_suite = {
.name = "resource",
.test_cases = resource_test_cases,
};
kunit_test_suite(resource_test_suite);
MODULE_DESCRIPTION("I/O Port & Memory Resource manager unit tests");
MODULE_LICENSE("GPL");
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