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23034-x86-arch_set_info_guest-DoS.patch
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File 23034-x86-arch_set_info_guest-DoS.patch of Package xen
References: bnc#679344 # HG changeset patch # User Tim Deegan <Tim.Deegan@citrix.com> # Date 1300121989 0 # Node ID c79aae866ad8397e129b5801f8f97f604743a7c2 # Parent 84bacd800bf88e37434d49547ad8224be46e2a52 x86_64: fix error checking in arch_set_info_guest() Cannot specify user mode execution without specifying user-mode pagetables. Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com> Acked-by: Keir Fraser <keir@xen.org> --- a/xen/arch/x86/domain.c +++ b/xen/arch/x86/domain.c @@ -715,6 +715,11 @@ int arch_set_info_guest( v->arch.guest_table_user = pagetable_from_pfn(cr3_pfn); } + else if ( !(flags & VGCF_in_kernel) ) + { + destroy_gdt(v); + return -EINVAL; + } #endif } #ifdef CONFIG_COMPAT
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