In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ocfs2: reject dinodes with non-canonical i_mode type<\/p>\n
Patch series “ocfs2: harden inode validators against forged metadata”, v2.<\/p>\n
This series adds three structural checks to OCFS2 dinode validation so
\nmalformed on-disk fields are rejected before ocfs2_populate_inode() copies
\nthem into the in-core inode.<\/p>\n
The checks cover:<\/p>\n
– i_mode values whose type bits do not name a canonical POSIX file
\n type;
\n – non-device dinodes whose id1.dev1.i_rdev field is non-zero; and
\n – non-inline dinodes that claim non-zero i_size while i_clusters is
\n zero, covering directories unconditionally and regular files on
\n non-sparse volumes.<\/p>\n
The normal read path reports these through ocfs2_error(), matching the
\nexisting suballoc-slot, inline-data, chain-list, and refcount checks. The
\nonline filecheck path uses the same structural predicates but keeps its
\nown reporting contract, returning OCFS2_FILECHECK_ERR_INVALIDINO instead
\nof calling ocfs2_error().<\/p>\n
This patch (of 3):<\/p>\n
ocfs2_validate_inode_block() currently accepts any non-zero i_mode value.
\nocfs2_populate_inode() then copies that mode verbatim into inode->i_mode
\nand dispatches on i_mode & S_IFMT to the file\/dir\/symlink\/special_file
\niops; an unrecognised type falls through to ocfs2_special_file_iops and
\ninit_special_inode().<\/p>\n
Reject dinodes whose type bits do not name one of the seven canonical
\nPOSIX file types. Use fs_umode_to_ftype(), the same generic file-type
\nconversion helper OCFS2 already uses for directory entries, so the
\naccepted inode type set matches the kernel file-type vocabulary instead of
\nopen-coding a local switch.<\/p>\n
Apply the same structural check to the online filecheck read path.
\nfilecheck keeps its own error namespace, so it reports malformed i_mode
\nthrough the filecheck logger and OCFS2_FILECHECK_ERR_INVALIDINO instead of
\ncalling ocfs2_error(), but it must not allow a malformed dinode to proceed
\ninto ocfs2_populate_inode().<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
ocfs2: reject dinodes with non-canonical i_mode type<\/p>\n
Patch series “ocfs2: harden inode validators against forged metadata”, v2.<\/p>\n
T<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-6810","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/6810","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=6810"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=6810"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=6810"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}