In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()<\/p>\n
file_hash() digests the first LOCKD_FH_HASH_SIZE bytes of
\nnfs_fh.data when bucketing nlm_files[], independent of fh.size.
\nCommit 3de744ee4e45 (“lockd: Use xdrgen XDR functions for the
\nNLMv4 TEST procedure”) set .pc_argzero to zero for the converted
\nprocedures and moved file-handle population into
\nnlm4svc_lookup_file(), which copies only xdr_lock->fh.len bytes
\ninto lock->fh.data.<\/p>\n
When an NLMv4 client presents a file handle shorter than
\nLOCKD_FH_HASH_SIZE, bytes fh.len..31 retain whatever the argument
\nbuffer held from an earlier request. The same wire handle then
\nhashes to different buckets across calls; nlm_lookup_file() misses
\nthe existing nlm_file entry, and lock-state lookups fail.<\/p>\n
Zero only the tail bytes that file_hash() would otherwise consume.
\nHandles of LOCKD_FH_HASH_SIZE or larger already populate every byte
\nthat file_hash() reads.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
lockd: Avoid hashing uninitialized bytes in nlm4svc_lookup_file()<\/p>\n
file_hash() digests the first LOCKD_FH_HASH_SIZE bytes of
\nnfs_fh<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-7262","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/7262","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=7262"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7262"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7262"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}