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authorMatan Barak <matanb@mellanox.com>2015-12-15 20:30:10 +0200
committerDoug Ledford <dledford@redhat.com>2015-12-23 23:25:59 -0500
commit301a721e1fcb890afc29997f46de9561686ed391 (patch)
treef71758b19e20fedb62b9887541919e9705de2168 /include/rdma
parent972ecb82137949be9649c7184782d00ff102a212 (diff)
IB/core: Add ib_is_udata_cleared
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@mellanox.com> Reviewed-by: Haggai Eran <haggaie@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'include/rdma')
-rw-r--r--include/rdma/ib_verbs.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 36acb30eac85..bbb1c349cb3d 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -53,6 +53,8 @@
#include <uapi/linux/if_ether.h>
#include <net/ipv6.h>
#include <net/ip.h>
+#include <linux/string.h>
+#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/mmu_notifier.h>
@@ -1922,6 +1924,31 @@ 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,
+ size_t offset,
+ size_t len)
+{
+ const void __user *p = udata->inbuf + offset;
+ bool ret = false;
+ u8 *buf;
+
+ if (len > USHRT_MAX)
+ return false;
+
+ buf = kmalloc(len, GFP_KERNEL);
+ if (!buf)
+ return false;
+
+ if (copy_from_user(buf, p, len))
+ goto free;
+
+ ret = !memchr_inv(buf, 0, len);
+
+free:
+ kfree(buf);
+ return ret;
+}
+
/**
* ib_modify_qp_is_ok - Check that the supplied attribute mask
* contains all required attributes and no attributes not allowed for