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 | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index 9a68a19..33ab4eb 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -50,6 +50,8 @@ #include <linux/workqueue.h> #include <linux/socket.h> #include <uapi/linux/if_ether.h> +#include <linux/string.h> +#include <linux/slab.h> #include <linux/atomic.h> #include <linux/mmu_notifier.h> @@ -1887,6 +1889,31 @@ 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 -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html