RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/iwcm: Fix WARNING:at_kernel/workqueue.c:#check_flush_dependency In the commit aee2424246f9 ("RDMA/iwcm: Fix a use-after-free related to destroying CM IDs"), the function flush_workqueue is invoked to flush the work queue iwcm_wq. But at that time, the work queue iwcm_wq was created via the function alloc_ordered_workqueue without the flag WQ_MEM_RECLAIM. Because the current process is trying to flush the whole iwcm_wq, if iwcm_wq doesn't have the flag WQ_MEM_RECLAIM, verify that the current process is not reclaiming memory or running on a workqueue which doesn't have the flag WQ_MEM_RECLAIM as that can break forward-progress guarantee leading to a deadlock. The call trace is as below: [ 125.350876][ T1430] Call Trace: [ 125.356281][ T1430] <TASK> [ 125.361285][ T1430] ? __warn (kernel/panic.c:693) [ 125.367640][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.375689][ T1430] ? report_bug (lib/bug.c:180 lib/bug.c:219) [ 125.382505][ T1430] ? handle_bug (arch/x86/kernel/traps.c:239) [ 125.388987][ T1430] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) [ 125.395831][ T1430] ? asm_exc_invalid_op (arch/x86/include/asm/idtentry.h:621) [ 125.403125][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.410984][ T1430] ? check_flush_dependency (kernel/workqueue.c:3706 (discriminator 9)) [ 125.418764][ T1430] __flush_workqueue (kernel/workqueue.c:3970) [ 125.426021][ T1430] ? pfx_might_resched (kernel/sched/core.c:10151) [ 125.433431][ T1430] ? destroy_cm_id (drivers/infiniband/core/iwcm.c:375) iw_cm [ 125.441209][ T1430] ? pfx_flush_workqueue (kernel/workqueue.c:3910) [ 125.473900][ T1430] ? _raw_spin_lock_irqsave (arch/x86/include/asm/atomic.h:107 include/linux/atomic/atomic-arch-fallback.h:2170 include/linux/atomic/atomic-instrumented.h:1302 include/asm-generic/qspinlock.h:111 include/linux/spinlock.h:187 include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 125.473909][ T1430] ? pfxraw_spin_lock_irqsave (kernel/locking/spinlock.c:161) [ 125.482537][ T1430] _destroy_id (drivers/infiniband/core/cma.c:2044) rdma_cm [ 125.495072][ T1430] nvme_rdma_free_queue (drivers/nvme/host/rdma.c:656 drivers/nvme/host/rdma.c:650) nvme_rdma [ 125.505827][ T1430] nvme_rdma_reset_ctrl_work (drivers/nvme/host/rdma.c:2180) nvme_rdma [ 125.505831][ T1430] process_one_work (kernel/workqueue.c:3231) [ 125.515122][ T1430] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3393) [ 125.515127][ T1430] ? __pfx_worker_thread (kernel/workqueue.c:3339) [ 125.531837][ T1430] kthread (kernel/kthread.c:389) [ 125.539864][ T1430] ? __pfx_kthread (kernel/kthread.c:342) [ 125.550628][ T1430] ret_from_fork (arch/x86/kernel/process.c:147) [ 125.558840][ T1430] ? __pfx_kthread (kernel/kthread.c:342) [ 125.558844][ T1430] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) [ 125.566487][ T1430] </TASK> [ 125.566488][ T1430] ---[ end trace 0000000000000000 ]---

Timeline

1. Oct 21, 2024, 11:53 AM UTCCVE published
2. Oct 21, 2024, 1:05 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 15, 2026, 12:51 AM UTCRecord last updated

Affected versions

• Linux Linux

  From d91d253c87fd1efece521ff2612078a35af673c6 · fixed in da2708a19f45b4a7278adf523837c8db21d1e2b5; From 7f25f296fc9bd0435be14e89bf657cd615a23574 · fixed in 29b3bbd912b8db86df7a3c180b910ccb621f5635; From 94ee7ff99b87435ec63211f632918dc7f44dac79 · fixed in 2efe8da2ddbf873385b4bc55366d09350b408df6; From 557d035fe88d78dd51664f4dc0e1896c04c97cf6 · fixed in da0392698c62397c19deb1b9e9bdf2fbb5a9420e; From dc8074b8901caabb97c2d353abd6b4e7fa5a59a5 · fixed in a64f30db12bdc937c5108158d98c8eab1925c548; From ff5bbbdee08287d75d72e65b72a2b76d9637892a · fixed in 8b7df76356d098f85f3bd2c7cf6fb43f531893d7; From ee39384ee787e86e9db4efb843818ef0ea9cb8ae · fixed in c8b18a75282cfd27822a8cc3c1f005c1ac8d1a58; From aee2424246f9f1dadc33faa78990c1e2eb7826e4 · fixed in a09dc967b3c58899e259c0aea092f421d22a0b04; From aee2424246f9f1dadc33faa78990c1e2eb7826e4 · fixed in 86dfdd8288907f03c18b7fb462e0e232c4f98d89; From 4.19.320 · fixed in 4.19.323; From 5.4.282 · fixed in 5.4.285; From 5.10.224 · fixed in 5.10.227; From 5.15.165 · fixed in 5.15.168; From 6.1.103 · fixed in 6.1.113; From 6.6.44 · fixed in 6.6.54; From 6.10.3 · fixed in 6.10.13

• Linux Linux

  6.11

• KernelLinux

  fixed in 4.19.323; From 4.20.0 · fixed in 5.4.285; From 5.5.0 · fixed in 5.10.227; From 5.11.0 · fixed in 5.15.168; From 5.16.0 · fixed in 6.1.113; From 6.2.0 · fixed in 6.6.54; From 6.7.0 · fixed in 6.10.13; From 6.11.0 · fixed in 6.11.2

References 9