In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/vmwgfx: fix guest_memory_dirty bitfield clobbered as size<\/p>\n
Two sites in vmwgfx_resource.c assign boolean literals to
\nres->guest_memory_size, which is an unsigned long allocation-size
\nfield; the intended target is the adjacent res->guest_memory_dirty
\nbitfield. After the assignments the field holds 0 or 1 instead of
\nthe resource’s MOB allocation size:<\/p>\n
– vmw_resource_release() writes 0 (false), and
\n – vmw_resource_unbind_list() writes 1 (true).<\/p>\n
Subsequent revalidation paths read guest_memory_size when computing
\nthe dirty page range (vmw_bo_dirty_transfer_to_res()) and the buffer
\nallocation size (vmw_resource_buf_alloc()), producing zero-length
\nwalks or wrap-around ranges that read or write past the MOB bitmap.
\nThe dirty-tracking intent of the original code (mark the resource as
\ndirtied since the last sync) is also lost, since guest_memory_dirty
\nis never updated.<\/p>\n
Rename both assignments to guest_memory_dirty.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
drm\/vmwgfx: fix guest_memory_dirty bitfield clobbered as size<\/p>\n
Two sites in vmwgfx_resource.c assign boolean literals to
\nres->guest<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-12349","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/12349","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=12349"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=12349"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=12349"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}