In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
tipc: avoid busy looping in tipc_exit_net()<\/p>\n
Blamed commit introduced a busy-wait loop in tipc_exit_net()
\nto wait for pending UDP bearer cleanup works to complete:<\/p>\n
while (atomic_read(&tn->wq_count))
\n cond_resched();<\/p>\n
This loop can busy-wait for a long time if cond_resched() is a NOP. This
\ntypically happens if the netns exit is executed by a high priority task,
\nor under kernels configured without preemption (CONFIG_PREEMPT_NONE). In
\nsuch cases, it wastes CPU cycles and can lead to soft lockups.<\/p>\n
Fix this by replacing the busy loop with wait_var_event(), allowing the
\nthread to sleep properly until the work queue count reaches zero.<\/p>\n
Accordingly, update cleanup_bearer() to use atomic_dec_and_test() and
\nwake_up_var() to wake up the waiter when the count drops to zero.<\/p>\n
This uses the global wait queue hash table, avoiding the need to bloat
\nstruct tipc_net with a wait_queue_head_t. The atomic_dec_and_test()
\nprovides the necessary memory barrier to ensure the wakeup is not missed.<\/p>\n","protected":false},"excerpt":{"rendered":"
In the Linux kernel, the following vulnerability has been resolved:<\/p>\n
tipc: avoid busy looping in tipc_exit_net()<\/p>\n
Blamed commit introduced a busy-wait loop in tipc_exit_net()
\nto wait for pending UDP b<\/p>\n","protected":false},"template":"","meta":[],"categories":[],"tags":[],"class_list":["post-17414","vuln","type-vuln","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.54iter.cn\/index.php?rest_route=\/wp\/v2\/vuln\/17414","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=17414"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=17414"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.54iter.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=17414"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}