{"id":438,"date":"2010-11-17T14:07:29","date_gmt":"2010-11-17T21:07:29","guid":{"rendered":"http:\/\/mattfife.net\/wordpress\/?p=438"},"modified":"2012-08-12T19:19:52","modified_gmt":"2012-08-13T02:19:52","slug":"the-key-is-mov-edi-0x9c5a203a","status":"publish","type":"post","link":"https:\/\/mattfife.com\/?p=438","title":{"rendered":"The key is MOV EDI, 0×9C5A203A"},"content":{"rendered":"

That’s the assembly instruction you need to unlock a secret ‘debug mode’ on AMD processors since the Athelon.\u00a0 While you need to be in ring 0 to execute it; it did bring up some interesting possibilities of using the special debugging mode for reverse-engineering operation of the chip, accessing possible new features, or presenting a chink in the security armor.\u00a0 So far, the security problems don’t seem to be probable, but if they cause undocumented resets\/etc – they might be.<\/p>\n

Anyway – interesting article<\/a>.\u00a0 Original posting here<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

That’s the assembly instruction you need to unlock a secret ‘debug mode’ on AMD processors since the Athelon.\u00a0 While you need to be in ring 0 to execute it; it did bring up some interesting possibilities of using the special debugging mode for reverse-engineering operation of the chip, accessing possible new features, or presenting a chink in the security armor.\u00a0 So far, the security problems don’t seem to be probable, but if they cause undocumented resets\/etc – they might be….<\/p>\n

Read More Read More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"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":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[7],"tags":[],"class_list":["post-438","post","type-post","status-publish","format-standard","hentry","category-technicalprogramming"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4WECr-74","jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/mattfife.com\/index.php?rest_route=\/wp\/v2\/posts\/438","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mattfife.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mattfife.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mattfife.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/mattfife.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=438"}],"version-history":[{"count":1,"href":"https:\/\/mattfife.com\/index.php?rest_route=\/wp\/v2\/posts\/438\/revisions"}],"predecessor-version":[{"id":583,"href":"https:\/\/mattfife.com\/index.php?rest_route=\/wp\/v2\/posts\/438\/revisions\/583"}],"wp:attachment":[{"href":"https:\/\/mattfife.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mattfife.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=438"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mattfife.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}