In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
md\/md-llbitmap: prevent create failure bitmap UAF<\/p>\n
llbitmap_create() publishes mddev->bitmap before reading the bitmap
\nsuperblock. This is needed because llbitmap_read_sb() can initialize a
\nnew bitmap and flush it through helpers that use mddev->bitmap.<\/p>\n
If llbitmap_read_sb() fails, the old cleanup dropped bitmap_info.mutex
\nand freed llbitmap before clearing mddev->bitmap. Readers such as
\n\/proc\/mdstat rely on bitmap_info.mutex to keep the bitmap pointer stable
\nwhile collecting bitmap stats, so they could observe the stale pointer
\nafter the failed create path released the mutex.<\/p>\n
Clear mddev->bitmap while still holding bitmap_info.mutex, then free the
\nfailed llbitmap after dropping the mutex. This makes mutex-protected
\nreaders see either a live bitmap or no bitmap.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
md\/md-llbitmap: prevent create failure bitmap UAF<\/p>\n
llbitmap_create() publishes mddev->bitmap before reading the bitmap
\nsuperblock. <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-25686","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/25686","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=25686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}