2.0 KiB
CVE-2024-56641
Description
In the Linux kernel, the following vulnerability has been resolved:net/smc: initialize close_work early to avoid warningWe encountered a warning that close_work was canceled beforeinitialization. WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0 Workqueue: events smc_lgr_terminate_work [smc] RIP: 0010:__flush_work+0x19e/0x1b0 Call Trace: ? __wake_up_common+0x7a/0x190 ? work_busy+0x80/0x80 __cancel_work_timer+0xe3/0x160 smc_close_cancel_work+0x1a/0x70 [smc] smc_close_active_abort+0x207/0x360 [smc] __smc_lgr_terminate.part.38+0xc8/0x180 [smc] process_one_work+0x19e/0x340 worker_thread+0x30/0x370 ? process_one_work+0x340/0x340 kthread+0x117/0x130 ? __kthread_cancel_work+0x50/0x50 ret_from_fork+0x22/0x30This is because when smc_close_cancel_work is triggered, e.g. the RDMAdriver is rmmod and the LGR is terminated, the conn->close_work isflushed before initialization, resulting in WARN_ON(!work->func)._smc_lgr_terminate | smc_connect{rdma|ism}------------------------------------------------------------- | smc_conn_create | - smc_lgr_register_connfor conn in lgr->conns_all |- smc_conn_kill | - smc_close_active_abort | - smc_close_cancel_work | - cancel_work_sync | - __flush_work | (close_work) | | smc_close_init | - INIT_WORK(&close_work)So fix this by initializing close_work before establishing theconnection.
POC
Reference
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