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resource, kunit: fix user-after-free in resource_test_region_intersects()

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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>
This commit is contained in:
Huang Ying 2024-09-30 15:06:11 +08:00 committed by Andrew Morton
parent 3d5854d75e
commit 0665d7a39b
1 changed files with 14 additions and 4 deletions
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18
kernel/resource_kunit.c
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@ -169,6 +169,8 @@ static void resource_test_intersection(struct kunit *test)
#define RES_TEST_RAM3_SIZE SZ_1M #define RES_TEST_RAM3_SIZE SZ_1M
#define RES_TEST_TOTAL_SIZE ((RES_TEST_WIN1_OFFSET + RES_TEST_WIN1_SIZE)) #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) static void remove_free_resource(void *ctx)
{ {
struct resource *res = (struct resource *)ctx; struct resource *res = (struct resource *)ctx;
@ -177,6 +179,14 @@ static void remove_free_resource(void *ctx)
kfree(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, static void resource_test_request_region(struct kunit *test, struct resource *parent,
resource_size_t start, resource_size_t size, resource_size_t start, resource_size_t size,
const char *name, unsigned long flags) const char *name, unsigned long flags)
@ -185,7 +195,7 @@ static void resource_test_request_region(struct kunit *test, struct resource *pa
res = __request_region(parent, start, size, name, flags); res = __request_region(parent, start, size, name, flags);
KUNIT_ASSERT_NOT_NULL(test, res); KUNIT_ASSERT_NOT_NULL(test, res);
kunit_add_action_or_reset(test, remove_free_resource, res); resource_test_add_action_or_abort(test, remove_free_resource, res);
} }
static void resource_test_insert_resource(struct kunit *test, struct resource *parent, static void resource_test_insert_resource(struct kunit *test, struct resource *parent,
@ -202,11 +212,11 @@ static void resource_test_insert_resource(struct kunit *test, struct resource *p
res->end = start + size - 1; res->end = start + size - 1;
res->flags = flags; res->flags = flags;
if (insert_resource(parent, res)) { if (insert_resource(parent, res)) {
kfree(res); resource_test_add_action_or_abort(test, kfree_wrapper, res);
KUNIT_FAIL_AND_ABORT(test, "Fail to insert resource %pR\n", res); KUNIT_FAIL_AND_ABORT(test, "Fail to insert resource %pR\n", res);
} }
kunit_add_action_or_reset(test, remove_free_resource, res); resource_test_add_action_or_abort(test, remove_free_resource, res);
} }
static void resource_test_region_intersects(struct kunit *test) static void resource_test_region_intersects(struct kunit *test)
@ -220,7 +230,7 @@ static void resource_test_region_intersects(struct kunit *test)
"test resources"); "test resources");
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent); KUNIT_ASSERT_NOT_ERR_OR_NULL(test, parent);
start = parent->start; start = parent->start;
kunit_add_action_or_reset(test, remove_free_resource, parent); resource_test_add_action_or_abort(test, remove_free_resource, parent);
resource_test_request_region(test, parent, start + RES_TEST_RAM0_OFFSET, resource_test_request_region(test, parent, start + RES_TEST_RAM0_OFFSET,
RES_TEST_RAM0_SIZE, "Test System RAM 0", flags); RES_TEST_RAM0_SIZE, "Test System RAM 0", flags);