In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()<\/p>\n
bpf_mem_cache_free_rcu() uses this_cpu_ptr() which requires migration
\nto be disabled. All callers of rhtab_delete_elem() disable migration
\nexcept __rhtab_map_lookup_and_delete_batch(), which calls it under
\nrcu_read_lock() only.<\/p>\n
On CONFIG_PREEMPT_RCU, rcu_read_lock() does not disable preemption or
\nmigration, so the task can migrate between CPUs during the delete loop,
\ncausing this_cpu_ptr() to trigger:<\/p>\n
BUG: using smp_processor_id() in preemptible [00000000] code<\/p>\n
Fix by wrapping the delete loop in migrate_disable()\/migrate_enable()
\nin __rhtab_map_lookup_and_delete_batch(), matching the migration
\nprotection that the other callers already provide.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()<\/p>\n
bpf_mem_cache_free_rcu() uses this_cpu_ptr() which <\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-41259","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/41259","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=41259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=41259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=41259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}