From: Matan Barak <matanb@xxxxxxxxxxxx>
Sometimes the uverbs uAPI doesn't really care about the structure it gets
from user-space. All it wants to do is to allocate enough space and send
it to the hardware/provider driver. Adding a UVERBS_ATTR_MIN_SIZE that
could be used for this scenarios. We use USHRT_MAX as the kernel known
size to bypass any zero validations.
Signed-off-by: Matan Barak <matanb@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/uverbs_std_types.c | 4 ++--
include/rdma/uverbs_ioctl.h | 2 ++
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/infiniband/core/uverbs_std_types.c b/drivers/infiniband/core/uverbs_std_types.c
index 569f48bd821e..35aff758c6f4 100644
--- a/drivers/infiniband/core/uverbs_std_types.c
+++ b/drivers/infiniband/core/uverbs_std_types.c
@@ -207,10 +207,10 @@ int uverbs_destroy_def_handler(struct ib_device *ib_dev,
* spec.
*/
const struct uverbs_attr_def uverbs_uhw_compat_in =
- UVERBS_ATTR_PTR_IN_SZ(UVERBS_ATTR_UHW_IN, UVERBS_ATTR_SIZE(0, USHRT_MAX),
+ UVERBS_ATTR_PTR_IN_SZ(UVERBS_ATTR_UHW_IN, UVERBS_ATTR_MIN_SIZE(0),
UA_FLAGS(UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO));
const struct uverbs_attr_def uverbs_uhw_compat_out =
- UVERBS_ATTR_PTR_OUT_SZ(UVERBS_ATTR_UHW_OUT, UVERBS_ATTR_SIZE(0, USHRT_MAX),
+ UVERBS_ATTR_PTR_OUT_SZ(UVERBS_ATTR_UHW_OUT, UVERBS_ATTR_MIN_SIZE(0),
UA_FLAGS(UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO));
void create_udata(struct uverbs_attr_bundle *ctx, struct ib_udata *udata)
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h
index 24689f3fe454..9229a07a8c7b 100644
--- a/include/rdma/uverbs_ioctl.h
+++ b/include/rdma/uverbs_ioctl.h
@@ -213,6 +213,8 @@ struct uverbs_object_tree_def {
.min_len = ((uintptr_t)(&((_type *)0)->_last + 1)), .len = sizeof(_type)
#define UVERBS_ATTR_SIZE(_min_len, _len) \
.min_len = _min_len, .len = _len
+#define UVERBS_ATTR_MIN_SIZE(_min_len) \
+ UVERBS_ATTR_SIZE(_min_len, USHRT_MAX)
/*
* In new compiler, UVERBS_ATTR could be simplified by declaring it as
--
2.14.3
--
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