In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sched\/core: Avoid false migration warning for proxy donors<\/p>\n
Proxy execution can move a blocked donor’s scheduling context to the
\nlock owner’s CPU even when the donor is migration-disabled. The donor
\ndoes not execute there, and its original execution CPU remains recorded
\nin wake_cpu.<\/p>\n
set_task_cpu() warns unconditionally for migration-disabled tasks, so a
\nsubsequent proxy migration or the wakeup path returning the donor home
\ntriggers a false positive: moving a blocked scheduling context does not
\nviolate the migration-disabled execution context.<\/p>\n
For example, creating a mutex owner on CPU1 and a migration-disabled
\nwaiter on CPU0 can trigger the following warning:<\/p>\n
proxy_migrate_repro: donor blocking on CPU0 with migration disabled
\n proxy_migrate_repro: donor moved from CPU0 to CPU1
\n WARNING: kernel\/sched\/core.c:3389 at set_task_cpu+0x1d3\/0x280
\n …
\n Call Trace:
\n try_to_wake_up+0x43f\/0x780
\n __mutex_unlock_slowpath+0x330\/0x540
\n owner_fn+0x9f\/0xc0 [proxy_migrate_repro]
\n …
\n proxy_migrate_repro: donor woke on CPU0, task_cpu=0
\n proxy_migrate_repro: completed<\/p>\n
Exclude blocked proxy donors from the warning. The proxy wakeup path
\nrestores an executable placement before clearing the blocked state.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
sched\/core: Avoid false migration warning for proxy donors<\/p>\n
Proxy execution can move a blocked donor’s scheduling context to the
\nlo<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-39089","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/39089","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=39089"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39089"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39089"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}