From e22f3a3170e5c3028dc83fbdfb0d8705fd00df75 Mon Sep 17 00:00:00 2001
From: Joan Lledó <jlledom@member.fsf.org>
Date: Wed, 5 Jul 2023 21:38:12 +0200
Subject: pci-arbiter: Prevent mapping IO regions

* pci-arbiter/netfs_impl.c:
  * get_filemap_region(): Return MACH_PORT_NULL and set errno to EOPNOTSUPP
    when the client tries to map a IO region file.
Message-Id: <20230705193812.6384-2-jlledom@mailfence.com>
---
 pci-arbiter/netfs_impl.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'pci-arbiter/netfs_impl.c')

diff --git a/pci-arbiter/netfs_impl.c b/pci-arbiter/netfs_impl.c
index b66f0019..4bb5c97a 100644
--- a/pci-arbiter/netfs_impl.c
+++ b/pci-arbiter/netfs_impl.c
@@ -583,6 +583,9 @@ get_filemap_region (struct node *node, vm_prot_t prot)
     strtol (&node->nn->ln->name[strlen (node->nn->ln->name) - 1], 0, 16);
   region = &node->nn->ln->device->regions[reg_num];
 
+  if (region->is_IO)
+    goto error;
+
   /* Ensure the region is mapped */
   err = device_map_region (node->nn->ln->device, region,
 			   &node->nn->ln->region_maps[reg_num]);
-- 
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