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SUSE:SLE-12-SP1:GA
xen.10697
xsa243-1.patch
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File xsa243-1.patch of Package xen.10697
From: Andrew Cooper <andrew.cooper3@citrix.com> Subject: x86: Disable the use of auto-translated PV guests This is a minimal backport of c/s 92942fd3d469 "x86/mm: drop guest_{map,get_eff}_l1e() hooks" from Xen 4.7, which stated: Disallow the unmaintained and presumed broken translated-but-not-external paging mode combination ... It turns out that this mode is insecure to run with, as opposed to just simply broken. This is part of XSA-243. Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com> --- a/xen/arch/x86/mm/paging.c +++ b/xen/arch/x86/mm/paging.c @@ -813,6 +813,15 @@ void paging_final_teardown(struct domain * creation. */ int paging_enable(struct domain *d, u32 mode) { + switch ( mode & (PG_external | PG_translate) ) + { + case 0: + case PG_external | PG_translate: + break; + default: + return -EINVAL; + } + if ( hap_enabled(d) ) return hap_enable(d, mode | PG_HAP_enable); else
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