IB/core: Add mitigation for Spectre V1

Some processors may mispredict an array bounds check and
speculatively access memory that they should not. With
a user supplied array index we like to play things safe
by masking the value with the array size before it is
used as an index.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20190731043957.GA1600@agluck-desk2.amr.corp.intel.com
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index 9f8a480..ffdeaf6 100644 (file)
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -49,6 +49,7 @@
 #include <linux/sched.h>
 #include <linux/semaphore.h>
 #include <linux/slab.h>
+#include <linux/nospec.h>
 
 #include <linux/uaccess.h>
 
@@ -884,11 +885,14 @@ static int ib_umad_unreg_agent(struct ib_umad_file *file, u32 __user *arg)
 
        if (get_user(id, arg))
                return -EFAULT;
+       if (id >= IB_UMAD_MAX_AGENTS)
+               return -EINVAL;
 
        mutex_lock(&file->port->file_mutex);
        mutex_lock(&file->mutex);
 
-       if (id >= IB_UMAD_MAX_AGENTS || !__get_agent(file, id)) {
+       id = array_index_nospec(id, IB_UMAD_MAX_AGENTS);
+       if (!__get_agent(file, id)) {
                ret = -EINVAL;
                goto out;
        }