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[PATCH 3/5] fix port name copyin

From: Luca Dariz
Subject: [PATCH 3/5] fix port name copyin
Date: Mon, 27 Feb 2023 21:44:59 +0100

* x86_64/copy_user.c: in mach_msg_user_header_t there are some holes
  that need to be cleared, to adapt to the different layout of
 x86_64/copy_user.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/x86_64/copy_user.c b/x86_64/copy_user.c
index 86d23525..ae17c368 100644
--- a/x86_64/copy_user.c
+++ b/x86_64/copy_user.c
@@ -194,6 +194,8 @@ int copyinmsg (const void *userbuf, void *kernelbuf, const 
size_t usize)
                 "mach_msg_header_t and mach_msg_user_header_t expected to be 
of the same size");
   if (copyin(umsg, kmsg, sizeof(mach_msg_header_t)))
     return 1;
+  kmsg->msgh_remote_port &= 0xFFFFFFFF; // FIXME: still have port names here
+  kmsg->msgh_local_port &= 0xFFFFFFFF;  // also, this assumes little-endian
   vm_offset_t usaddr, ueaddr, ksaddr;

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