diff options
| author | Matan Barak <matanb@mellanox.com> | 2015-12-15 20:30:10 +0200 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2015-12-23 23:25:59 -0500 |
| commit | 301a721e1fcb890afc29997f46de9561686ed391 (patch) | |
| tree | f71758b19e20fedb62b9887541919e9705de2168 /include/rdma/ib_verbs.h | |
| parent | 972ecb82137949be9649c7184782d00ff102a212 (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/ib_verbs.h')
| -rw-r--r-- | include/rdma/ib_verbs.h | 27 |
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 |