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IB/core: Add ib_is_udata_cleared

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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>
This commit is contained in:
Matan Barak 2015-12-15 20:30:10 +02:00 committed by Doug Ledford
parent 972ecb8213
commit 301a721e1f
1 changed files with 27 additions and 0 deletions
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27
include/rdma/ib_verbs.h
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@ -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