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Commit 301a721e authored by Matan Barak's avatar Matan Barak Committed by Doug Ledford
Browse files

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: default avatarMatan Barak <matanb@mellanox.com>
Reviewed-by: default avatarHaggai Eran <haggaie@mellanox.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 972ecb82

include/rdma/ib_verbs.h

+27 −0
Original line number Diff line number Diff line
@@ -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