{"id":49111,"date":"2022-07-07T15:36:46","date_gmt":"2022-07-07T08:36:46","guid":{"rendered":"https:\/\/deepquest.code511.com\/blog\/2022\/07\/xen-pv-guest-non-selfsnoop-cpu-memory-corruption\/"},"modified":"2022-07-07T15:36:46","modified_gmt":"2022-07-07T08:36:46","slug":"xen-pv-guest-non-selfsnoop-cpu-memory-corruption","status":"publish","type":"post","link":"https:\/\/deepquest.code511.com\/blog\/2022\/07\/xen-pv-guest-non-selfsnoop-cpu-memory-corruption\/","title":{"rendered":"Xen PV Guest Non-SELFSNOOP CPU Memory Corruption"},"content":{"rendered":"<p>On CPUs without SELFSNOOP support, a Xen PV domain that has access to a PCI device (which grants the domain the ability to set arbitrary cache attributes on all its pages) can trick Xen into validating an L2 pagetable that contains a cacheline that is marked as clean in the cache but actually differs from main memory. After the pagetable has been validated, an attacker can flush the &#8220;clean&#8221; cacheline, such that on the next load, unvalidated data from main memory shows up in the pagetable.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>On CPUs without SELFSNOOP support, a Xen PV domain that has access to a PCI device (which grants the domain the ability to set arbitrary cache attributes on all its&#8230;<\/p>\n","protected":false},"author":439,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_seopress_robots_primary_cat":"","_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[43],"tags":[],"class_list":["post-49111","post","type-post","status-publish","format-standard","hentry","category-exploit"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4bBYZ-cM7","_links":{"self":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/posts\/49111","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/users\/439"}],"replies":[{"embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/comments?post=49111"}],"version-history":[{"count":0,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/posts\/49111\/revisions"}],"wp:attachment":[{"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/media?parent=49111"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/categories?post=49111"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/deepquest.code511.com\/blog\/wp-json\/wp\/v2\/tags?post=49111"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}