In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
zram: fix out-of-bounds access in writeback_store()<\/p>\n
Patch series “zram: fix stale scan bounds after reinitialization”.<\/p>\n
Both writeback_store() and read_block_state() derive their table scan
\nbounds from zram->disksize before acquiring dev_lock. If the device is
\nreset and reinitialized with a smaller disksize between that read and lock
\nacquisition, the bound can describe the old table while the scan operates
\non the new one. This can lead to out-of-bounds slot accesses.<\/p>\n
Move both bound calculations under dev_lock so each bound remains
\nconsistent with the table throughout its scan. Keep the fixes separate
\nbecause the affected interfaces originate from different commits and can
\nbe backported independently.<\/p>\n
This patch (of 2):<\/p>\n
writeback_store() calculates the table scan bounds before taking dev_lock.
\nA reset followed by reconfiguration with a smaller disksize can therefore
\nreplace zram->table while writeback_store() is waiting for the lock. Once
\nit acquires the lock, it sees an initialized device but scans the new
\ntable using the old upper bound, resulting in an out-of-bounds access.<\/p>\n
Calculate the number of pages while holding dev_lock so the scan bound
\nmatches the table protected by the lock.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
zram: fix out-of-bounds access in writeback_store()<\/p>\n
Patch series “zram: fix stale scan bounds after reinitialization”.<\/p>\n
Both write<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-21640","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/21640","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=21640"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21640"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21640"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}