In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ceph: bound copied dentry name length in NFS export get_name<\/p>\n
ceph_get_name() copies the MDS-supplied name into the caller’s
\nNAME_MAX-sized buffer with memcpy(name, rinfo->dname, rinfo->dname_len)
\nand then writes name[rinfo->dname_len] = 0, without checking dname_len
\nagainst NAME_MAX. A malicious or buggy MDS that returns a LOOKUPNAME reply
\nwith dname_len > NAME_MAX overflows the buffer. __get_snap_name() copies
\nrde->name \/ rde->name_len the same unchecked way.<\/p>\n
Impact: a malicious or compromised Ceph MDS overflows the NAME_MAX name
\nbuffer in a client’s NFS-export get_name path, a slab out-of-bounds write
\nreported by KASAN. Reachable when a CephFS mount is re-exported over NFS.<\/p>\n
Add ceph_export_copy_name(), which rejects lengths above NAME_MAX with
\n-ENAMETOOLONG before the copy, and use it in both ceph_get_name() and
\n__get_snap_name().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ceph: bound copied dentry name length in NFS export get_name<\/p>\n
ceph_get_name() copies the MDS-supplied name into the caller’s
\nNAME_M<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21574","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21574","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=21574"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21574"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21574"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}