In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf\/x86\/intel\/uncore: Fix uncore_box ref\/unref ordering<\/p>\n
In uncore_event_cpu_online(), uncore_box_ref() was called before
\nuncore_change_context(). uncore_box_ref() gates on box->cpu >= 0,
\nbut box->cpu is still -1 at that point because uncore_change_context()
\nhas not run yet. As a result, the box is never initialized on the
\nfirst CPU to come online in a die, leaving it permanently
\nuninitialized in the single-CPU-per-die case.<\/p>\n
Thus, box->refcnt is one count below the true value, and in the CPU
\noffline path, the box will be torn down on the second-to-last CPU.<\/p>\n
In uncore_event_cpu_offline(), uncore_box_unref() was called after
\nuncore_change_context(), so box->cpu is already -1 when the collector
\nCPU goes offline, which prevents it from tearing down the box.<\/p>\n
Fix by swapping the call order in both paths so that
\nuncore_box_{ref,unref}() runs at the point where box->cpu reflects
\nthe correct context.<\/p>\n
Move allocate_boxes() out of uncore_box_ref() to enable this
\nreordering.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
perf\/x86\/intel\/uncore: Fix uncore_box ref\/unref ordering<\/p>\n
In uncore_event_cpu_online(), uncore_box_ref() was called before
\nuncore_c<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-26038","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/26038","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=26038"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=26038"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=26038"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}