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SUSE:SLE-12-SP2:GA
xen.7653
xsa251.patch
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File xsa251.patch of Package xen.7653
From: Jan Beulich <jbeulich@suse.com> Subject: x86/paging: don't unconditionally BUG() on finding SHARED_M2P_ENTRY PV guests can fully control the values written into the P2M. This is XSA-251. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/arch/x86/mm/paging.c +++ b/xen/arch/x86/mm/paging.c @@ -285,7 +285,7 @@ void paging_mark_dirty(struct domain *d, /* We /really/ mean PFN here, even for non-translated guests. */ pfn = get_gpfn_from_mfn(mfn_x(gmfn)); /* Shared MFNs should NEVER be marked dirty */ - BUG_ON(SHARED_M2P(pfn)); + BUG_ON(paging_mode_translate(d) && SHARED_M2P(pfn)); /* * Values with the MSB set denote MFNs that aren't really part of the
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