In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm\/migrate_device: avoid out-of-bounds writes for compound folios<\/p>\n
migrate_device_range() and migrate_device_pfns() clear the entries
\nfollowing a compound folio so that the PFN arrays retain their
\npage-granular representation.<\/p>\n
If a compound folio extends beyond the end of the caller-provided range,
\nthe loops clear all following folio entries without limiting them to the
\nnumber of slots remaining in the npages-sized array, causing an
\nout-of-bounds write.<\/p>\n
Do not proceed with a compound folio if its page-granular representation
\ndoes not fit entirely in the remaining PFN array. If this happens, drop
\nany reference and lock acquired for the folio, clear the remaining
\nentries, and stop collecting.<\/p>\n
Observed with a KASAN x86 QEMU kernel using the HMM migrate_anon_huge_zero
\nselftest. Closing \/dev\/hmm_dmirror0 after migrating an anonymous huge
\npage to device memory exercises:<\/p>\n
dmirror_fops_release()
\n -> dmirror_device_evict_chunk()
\n -> migrate_device_range()<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
mm\/migrate_device: avoid out-of-bounds writes for compound folios<\/p>\n
migrate_device_range() and migrate_device_pfns() clear the entri<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-24654","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/24654","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=24654"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=24654"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=24654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}