[PATCH v4 12/17] iommufd/selftest: Rework TEST_LENGTH to test min_size explicitly

From: Yi Liu
Date: Thu Sep 21 2023 - 14:36:25 EST


From: Nicolin Chen <nicolinc@xxxxxxxxxx>

TEST_LENGTH passing ".size = sizeof(struct _struct) - 1" expects -EINVAL
from "if (ucmd.user_size < op->min_size)" check in iommufd_fops_ioctl().
This has been working when min_size is exactly the size of the structure.

However, if the size of the structure becomes larger than min_size, i.e.
the passing size above is larger than min_size, that min_size sanity no
longer works.

Since the first test in TEST_LENGTH() was to test that min_size sanity
routine, rework it to support a min_size calculation, rather than using
the full size of the structure.

Signed-off-by: Nicolin Chen <nicolinc@xxxxxxxxxx>
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
tools/testing/selftests/iommu/iommufd.c | 29 ++++++++++++++-----------
1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/tools/testing/selftests/iommu/iommufd.c b/tools/testing/selftests/iommu/iommufd.c
index 9c129e63d7c7..7a29d68bd1d2 100644
--- a/tools/testing/selftests/iommu/iommufd.c
+++ b/tools/testing/selftests/iommu/iommufd.c
@@ -86,12 +86,13 @@ TEST_F(iommufd, cmd_fail)

TEST_F(iommufd, cmd_length)
{
-#define TEST_LENGTH(_struct, _ioctl) \
+#define TEST_LENGTH(_struct, _ioctl, _last) \
{ \
+ size_t min_size = offsetofend(struct _struct, _last); \
struct { \
struct _struct cmd; \
uint8_t extra; \
- } cmd = { .cmd = { .size = sizeof(struct _struct) - 1 }, \
+ } cmd = { .cmd = { .size = min_size - 1 }, \
.extra = UINT8_MAX }; \
int old_errno; \
int rc; \
@@ -112,17 +113,19 @@ TEST_F(iommufd, cmd_length)
} \
}

- TEST_LENGTH(iommu_destroy, IOMMU_DESTROY);
- TEST_LENGTH(iommu_hw_info, IOMMU_GET_HW_INFO);
- TEST_LENGTH(iommu_hwpt_alloc, IOMMU_HWPT_ALLOC);
- TEST_LENGTH(iommu_ioas_alloc, IOMMU_IOAS_ALLOC);
- TEST_LENGTH(iommu_ioas_iova_ranges, IOMMU_IOAS_IOVA_RANGES);
- TEST_LENGTH(iommu_ioas_allow_iovas, IOMMU_IOAS_ALLOW_IOVAS);
- TEST_LENGTH(iommu_ioas_map, IOMMU_IOAS_MAP);
- TEST_LENGTH(iommu_ioas_copy, IOMMU_IOAS_COPY);
- TEST_LENGTH(iommu_ioas_unmap, IOMMU_IOAS_UNMAP);
- TEST_LENGTH(iommu_option, IOMMU_OPTION);
- TEST_LENGTH(iommu_vfio_ioas, IOMMU_VFIO_IOAS);
+ TEST_LENGTH(iommu_destroy, IOMMU_DESTROY, id);
+ TEST_LENGTH(iommu_hw_info, IOMMU_GET_HW_INFO, __reserved);
+ TEST_LENGTH(iommu_hwpt_alloc, IOMMU_HWPT_ALLOC, __reserved);
+ TEST_LENGTH(iommu_ioas_alloc, IOMMU_IOAS_ALLOC, out_ioas_id);
+ TEST_LENGTH(iommu_ioas_iova_ranges, IOMMU_IOAS_IOVA_RANGES,
+ out_iova_alignment);
+ TEST_LENGTH(iommu_ioas_allow_iovas, IOMMU_IOAS_ALLOW_IOVAS,
+ allowed_iovas);
+ TEST_LENGTH(iommu_ioas_map, IOMMU_IOAS_MAP, iova);
+ TEST_LENGTH(iommu_ioas_copy, IOMMU_IOAS_COPY, src_iova);
+ TEST_LENGTH(iommu_ioas_unmap, IOMMU_IOAS_UNMAP, length);
+ TEST_LENGTH(iommu_option, IOMMU_OPTION, val64);
+ TEST_LENGTH(iommu_vfio_ioas, IOMMU_VFIO_IOAS, __reserved);
#undef TEST_LENGTH
}

--
2.34.1