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SUSE:SLE-12-SP1:GA
xen.5015
xsa218-3.patch
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File xsa218-3.patch of Package xen.5015
From: Jan Beulich <jbeulich@suse.com> Subject: gnttab: correct maptrack table accesses In order to observe a consistent (limit,pointer-table) pair, the reader needs to either hold the grant table lock or both sides need to order their accesses suitably (the writer side barrier is already there). Add the missing barrier. This is part of XSA-218. Signed-off-by: Jan Beulich <jbeulich@suse.com> Reviewed-by: George Dunlap <george.dunlap@citrix.com> Index: xen-4.4.4-testing/xen/common/grant_table.c =================================================================== --- xen-4.4.4-testing.orig/xen/common/grant_table.c +++ xen-4.4.4-testing/xen/common/grant_table.c @@ -851,7 +851,9 @@ __gnttab_unmap_common( return; } + smp_rmb(); map = &maptrack_entry(lgt, op->handle); + spin_lock(&lgt->lock); if ( unlikely(!map->flags) )
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