Extending core and vendor verb commands require us to check that the
unknown part of the user's given command is all zeros.
Adding ib_is_udata_cleared in order to do so.
Signed-off-by: Matan Barak <matanb@xxxxxxxxxxxx>
---
include/rdma/ib_verbs.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index e4cc389..43f3cf2 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1855,6 +1855,26 @@ static inline int ib_copy_to_udata(struct ib_udata *udata, void *src, size_t len
return copy_to_user(udata->outbuf, src, len) ? -EFAULT : 0;
}
+static inline bool ib_is_udata_cleared(struct ib_udata *udata,
+ char cleared_char,
+ size_t offset,
+ size_t len)
+{
+ short i;
+
+ for (i = 0; i < len; i++) {
+ char c;
+
+ if (copy_from_user(&c, udata->inbuf + offset + i, sizeof(c)))
+ return false;
+
+ if (c != cleared_char)
+ return false;
+ }
+
+ return true;
+}
+
/**
* ib_modify_qp_is_ok - Check that the supplied attribute mask
* contains all required attributes and no attributes not allowed for
--
2.1.0
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