When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager’s page list. A subsequent page fault will cause the fault handler to re-insert the page into the object’s list. This corrupts the list, and on object destruction the page is freed twice.<\/p>\n
An unprivileged local user with access to a device that provides memory-mapped I\/O can trigger a use-after-free in the kernel, though this is limited to a pool of objects (“fictitious pages”) that are never recycled for a different purpose. It may be possible to exploit this to escalate privileges.<\/p>\n","protected":false},"excerpt":{"rendered":"
When msync(MS_INVALIDATE) is called on a mapping of an unmanaged device object, the physical pages in the mapping range are marked invalid but remain in the pager’s page list. A subsequent page fault<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-10465","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/10465","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln"}],"about":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/types\/vuln"}],"wp:attachment":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}