From: Matan Barak <matanb@xxxxxxxxxxxx>
Adding UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY flag to PTR_IN attributes.
By using this flag, the parse automatically allocates and copies the
user-space data. This data is accessible by using uverbs_attr_get_len
and uverbs_attr_get_alloced_ptr inline accessor functions from the
handler.
Signed-off-by: Matan Barak <matanb@xxxxxxxxxxxx>
Signed-off-by: Yishai Hadas <yishaih@xxxxxxxxxxxx>
Signed-off-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
---
drivers/infiniband/core/uverbs_ioctl.c | 25 ++++++++++++++++++++++++-
include/rdma/uverbs_ioctl.h | 25 +++++++++++++++++++++++++
2 files changed, 49 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/core/uverbs_ioctl.c b/drivers/infiniband/core/uverbs_ioctl.c
index 8cc3e8dad9b5..ee15c9ca788b 100644
--- a/drivers/infiniband/core/uverbs_ioctl.c
+++ b/drivers/infiniband/core/uverbs_ioctl.c
@@ -114,7 +114,26 @@ static int uverbs_process_attr(struct ib_device *ibdev,
uattr->attr_data.reserved)
return -EINVAL;
- e->ptr_attr.data = uattr->data;
+ if (val_spec->flags & UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY &&
+ uattr->len > sizeof(((struct ib_uverbs_attr *)0)->data)) {
+ int ret;
+ void *p;
+
+ p = kvmalloc(uattr->len, GFP_KERNEL);
+ if (!p)
+ return -ENOMEM;
+
+ e->ptr_attr.data = ptr_to_u64(p);
+
+ ret = copy_from_user(p, u64_to_user_ptr(uattr->data),
+ uattr->len);
+ if (ret) {
+ kvfree(p);
+ return -EFAULT;
+ }
+ } else {
+ e->ptr_attr.data = uattr->data;
+ }
e->ptr_attr.len = uattr->len;
e->ptr_attr.flags = uattr->flags;
break;
@@ -201,6 +220,10 @@ static int uverbs_finalize_attrs(struct uverbs_attr_bundle *attrs_bundle,
commit);
if (!ret)
ret = current_ret;
+ } else if (spec->type == UVERBS_ATTR_TYPE_PTR_IN &&
+ spec->flags & UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY &&
+ !uverbs_attr_ptr_is_inline(attr)) {
+ kvfree(u64_to_ptr(void, attr->ptr_attr.data));
}
}
}
diff --git a/include/rdma/uverbs_ioctl.h b/include/rdma/uverbs_ioctl.h
index 51042ef47524..d3a320b7f83e 100644
--- a/include/rdma/uverbs_ioctl.h
+++ b/include/rdma/uverbs_ioctl.h
@@ -65,6 +65,8 @@ enum {
UVERBS_ATTR_SPEC_F_MANDATORY = 1U << 0,
/* Support extending attributes by length, validate all unknown size == zero */
UVERBS_ATTR_SPEC_F_MIN_SZ_OR_ZERO = 1U << 1,
+ /* Valid only for PTR_IN. Allocate and copy the data inside the parser */
+ UVERBS_ATTR_SPEC_F_ALLOC_AND_COPY = 1U << 2,
};
/* Specification of a single attribute inside the ioctl message */
@@ -431,6 +433,17 @@ static inline struct ib_uobject *uverbs_attr_get_uobject(const struct uverbs_att
return attr->obj_attr.uobject;
}
+static inline int uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle,
+ u16 idx)
+{
+ const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
+
+ if (IS_ERR(attr))
+ return PTR_ERR(attr);
+
+ return attr->ptr_attr.len;
+}
+
static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from, size_t size)
{
@@ -457,6 +470,18 @@ static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
}
+static inline void *uverbs_attr_get_alloced_ptr(const struct uverbs_attr_bundle *attrs_bundle,
+ u16 idx)
+{
+ const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
+
+ if (IS_ERR(attr))
+ return (void *)attr;
+
+ return uverbs_attr_ptr_is_inline(attr) ? u64_to_ptr(void *, attr->ptr_attr.data) :
+ u64_to_ptr(void, attr->ptr_attr.data);
+}
+
static inline int _uverbs_copy_from(void *to,
const struct uverbs_attr_bundle *attrs_bundle,
size_t idx,
--
2.14.3
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