On 07/23/2015 11:31 AM, Jason Gunthorpe wrote:
It looks to me like register_always is similar to iSER, it is trying to avoid a MR if there is only 1 S/G entry. That performance behavior needs to default to disabled. The kernel must default to secure out of the box. [ ... ] This probably also takes care of the security issue for SRP, what do you think? [ ... ] diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index fb9fed0fac28..a1e3818d0791 100644 --- a/drivers/infiniband/ulp/srp/ib_srp.c +++ b/drivers/infiniband/ulp/srp/ib_srp.c @@ -69,7 +69,7 @@ static unsigned int cmd_sg_entries; static unsigned int indirect_sg_entries; static bool allow_ext_sg; static bool prefer_fr; -static bool register_always; +static bool register_always = true;
If we want security by default then I propose not only to change the default value of register_always from false into true but also to change the default value of prefer_fr from false into true such that fast registration becomes the default instead of FMR.
+ if (register_always) + mr_flags |= IB_ACCESS_REMOTE_READ | IB_ACCESS_REMOTE_WRITE;
Hmm ... did you perhaps intend if (!register_always) instead ? Thanks, Bart. -- 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
