In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nvdimm\/btt: reject an arena whose nfree is below the lane count<\/p>\n
The BTT info block’s nfree field, the number of reserve free blocks, is
\nread from the medium without validation. btt_freelist_init() and
\nbtt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree,
\nbut the I\/O path indexes them by the lane from nd_region_acquire_lane(),
\nwhich is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree.
\nA crafted or foreign arena whose nfree is below the lane count makes
\nfreelist[lane]\/rtt[lane] run past the allocation: an out-of-bounds write.<\/p>\n
btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the
\ncode does not currently honor: num_lanes is ND_MAX_LANES regardless of
\nnfree. Reject an arena whose nfree is below num_lanes at discovery,
\nbefore the per-lane arrays are allocated, enforcing that invariant.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
nvdimm\/btt: reject an arena whose nfree is below the lane count<\/p>\n
The BTT info block’s nfree field, the number of reserve free block<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24652","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24652","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=24652"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24652"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}