[Xen-changelog] [xen-unstable] x86_64: Do not leak trampoline mapping into dom0's initial address space.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1196862559 0
# Node ID c67d024fdd2d3527ccd08e513ca3ed3c9dcb4b68
# Parent  671ef298d491e24a5acb3f502746cd0d9342385b
x86_64: Do not leak trampoline mapping into dom0's initial address space.
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/arch/x86/domain_build.c |    1 +
 1 files changed, 1 insertion(+)

diff -r 671ef298d491 -r c67d024fdd2d xen/arch/x86/domain_build.c
--- a/xen/arch/x86/domain_build.c       Wed Dec 05 11:08:07 2007 +0000
+++ b/xen/arch/x86/domain_build.c       Wed Dec 05 13:49:19 2007 +0000
@@ -646,6 +646,7 @@ int __init construct_dom0(
         l4start = l4tab = page_to_virt(page);
     }
     copy_page(l4tab, idle_pg_table);
+    l4tab[0] = l4e_empty(); /* zap trampoline mapping */
     l4tab[l4_table_offset(LINEAR_PT_VIRT_START)] =
         l4e_from_paddr(__pa(l4start), __PAGE_HYPERVISOR);
     l4tab[l4_table_offset(PERDOMAIN_VIRT_START)] =

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