The previous implementation incorrectly assumed the original type of
'priv' was void**, leading to an unnecessary and misleading
cast. Correct the cast of the 'priv' pointer in test_dev_action() to
its actual type, long*, removing an unnecessary cast.
As an additional benefit, this fixes an out-of-bounds CHERI fault on
hardware with architectural capabilities. The original implementation
tried to store a capability-sized pointer using the priv
pointer. However, the priv pointer's capability only granted access to
the memory region of its original long type, leading to a bounds
violation since the size of a long is smaller than the size of a
capability. This change ensures that the pointer usage respects the
capabilities' bounds.
Fixes: d03c720e03bd ("kunit: Add APIs for managing devices")
Reviewed-by: David Gow <[email protected]>
Signed-off-by: Florian Schmaus <[email protected]>
---
Changes since v1:
- Fix simple formatting issue: long* -> long *
- Add 'Fixes' git trailer
lib/kunit/kunit-test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
index 8c01eabd4eaf..63130a48e237 100644
--- a/lib/kunit/kunit-test.c
+++ b/lib/kunit/kunit-test.c
@@ -739,7 +739,7 @@ static struct kunit_case kunit_current_test_cases[] = {
static void test_dev_action(void *priv)
{
- *(void **)priv = (void *)1;
+ *(long *)priv = 1;
}
static void kunit_device_test(struct kunit *test)
--
2.51.0
