In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation<\/p>\n
Shuangpeng Bai reported that KASAN detected a slab-out-of-bounds error
\nin nilfs_direct_propagate() during testing.<\/p>\n
Analysis revealed that after truncating a file, a node block immediately
\nbelow the B-tree root was not deleted. Instead, it remained in the B-tree
\nnode cache in a dirty state. The log writer subsequently detected this
\nblock and incorrectly invoked nilfs_direct_propagate() on it, which is
\ndesigned to handle only data blocks in direct mapping.<\/p>\n
B-tree nodes in the cache are managed by virtual block numbers, and their
\nlogical keys typically exceed the range expected by direct mapping.
\nConsequently, processing such a node as a direct mapping entry triggers
\na slab-out-of-bounds access.<\/p>\n
The root cause is that when a B-tree mapping collapses into a direct
\nmapping during truncation, an intermediate node block pointed to by the
\nroot node is left behind as garbage instead of being explicitly deleted.<\/p>\n
This resolves the issue by adding a nilfs_btree_discard() operation
\nto delete the remaining intermediate node block during the conversion.
\nA ‘deform’ flag is added to the bop_delete interface to explicitly signal
\nthat the deletion is part of a mapping transformation. This allows the
\nB-tree mapping implementation to perform the necessary cleanup and
\ndiscarding of the residual node structure that would be otherwise be left
\norphaned after the transition.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nilfs2: fix slab-out-of-bounds in nilfs_direct_propagate after truncation<\/p>\n
Shuangpeng Bai reported that KASAN detected a slab-out-o<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21645","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21645","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=21645"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21645"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21645"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}