In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm\/damon\/core: handle region split failure in apply_min_nr_regions()<\/p>\n
damon_apply_min_nr_regions() repeatedly split each region until its size
\nbecomes small enough to meet the user-defined low limit of the number of
\nregions. The loop assumes the split operation (damon_split_region_at())
\nwill always succeed and create the new region. But the operation could
\nsilently fail for memory allocation failures, for example.<\/p>\n
If such failure happens and the region was the last region, the linked
\nlist-based next region fetching returns invalid pointer. As a result,
\ninvalid memory dereference and corruption could happen. Even if the
\ncorner case is handled, it imposes stress to the allocator by trying split
\nregions for other targets. Fix the issue by breaking all the loops for
\nany region split failure.<\/p>\n
This means there could be a min_nr_regions violation. It will only rarely
\nhappen since the allocation is arguably too small to fail. Even if it
\nhappens, it is only temporal. damon_apply_min_nr_regions() will be called
\nagain after the aggregation interval.<\/p>\n
The user impact of the issue should be minor, since the allocation is
\narguably too small to fail. But, it could still theoretically happen, and
\nthe consequence is very bad.<\/p>\n
This issue was discovered [1] by Sashiko.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm\/damon\/core: handle region split failure in apply_min_nr_regions()<\/p>\n
damon_apply_min_nr_regions() repeatedly split each region unt<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24692","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24692","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=24692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}