Samuel Thibault
2007-Nov-27 11:23 UTC
[Xen-devel] [PATCH] [Mini-OS] Catch NULL dereferences
Unmap page 0 (only used early at boot) so as to catch NULL dereferences.
Signed-off-by: Samuel Thibault <samuel.thibault@citrix.com>
diff -r 26e766e0c628 extras/mini-os/arch/x86/mm.c
--- a/extras/mini-os/arch/x86/mm.c Mon Nov 26 22:28:48 2007 +0000
+++ b/extras/mini-os/arch/x86/mm.c Tue Nov 27 11:20:32 2007 +0000
@@ -270,6 +270,9 @@ void build_pagetable(unsigned long *star
start_address += PAGE_SIZE;
}
+ if (HYPERVISOR_update_va_mapping(0, (pte_t) {}, UVMF_INVLPG))
+ printk("Unable to unmap page 0\n");
+
*start_pfn = pt_pfn;
}
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