发布于3月6日3月6日 Members Ubuntu: (Multiple Advisories) (CVE-2024-35929): Linux kernel vulnerabilities Severity 7 CVSS (AV:L/AC:L/Au:S/C:C/I:C/A:C) Published 05/19/2024 Created 07/12/2024 Added 07/12/2024 Modified 01/30/2025 Description In the Linux kernel, the following vulnerability has been resolved: rcu/nocb: Fix WARN_ON_ONCE() in the rcu_nocb_bypass_lock() For the kernels built with CONFIG_RCU_NOCB_CPU_DEFAULT_ALL=y and CONFIG_RCU_LAZY=y, the following scenarios will trigger WARN_ON_ONCE() in the rcu_nocb_bypass_lock() and rcu_nocb_wait_contended() functions: CPU2 CPU11 kthread rcu_nocb_cb_kthread ksys_write rcu_do_batchvfs_write rcu_torture_timer_cbproc_sys_write __kmem_cache_free proc_sys_call_handler kmemleak_free drop_caches_sysctl_handler delete_object_fulldrop_slab __delete_object shrink_slab put_objectlazy_rcu_shrink_scan call_rcurcu_nocb_flush_bypass __call_rcu_commnrcu_nocb_bypass_lock raw_spin_trylock(&rdp->nocb_bypass_lock) fail atomic_inc(&rdp->nocb_lock_contended); rcu_nocb_wait_contended WARN_ON_ONCE(smp_processor_id() != rdp->cpu); WARN_ON_ONCE(atomic_read(&rdp->nocb_lock_contended))| |_ _ _ _ _ _ _ _ _ _same rdp and rdp->cpu != 11_ _ _ _ _ _ _ _ _ __| Reproduce this bug with "echo 3 > /proc/sys/vm/drop_caches". This commit therefore uses rcu_nocb_try_flush_bypass() instead of rcu_nocb_flush_bypass() in lazy_rcu_shrink_scan().If the nocb_bypass queue is being flushed, then rcu_nocb_try_flush_bypass will return directly. Solution(s) ubuntu-upgrade-linux-image-6-8-0-1006-gke ubuntu-upgrade-linux-image-6-8-0-1007-intel ubuntu-upgrade-linux-image-6-8-0-1007-raspi ubuntu-upgrade-linux-image-6-8-0-1008-ibm ubuntu-upgrade-linux-image-6-8-0-1008-oem ubuntu-upgrade-linux-image-6-8-0-1008-oracle ubuntu-upgrade-linux-image-6-8-0-1008-oracle-64k ubuntu-upgrade-linux-image-6-8-0-1009-nvidia ubuntu-upgrade-linux-image-6-8-0-1009-nvidia-64k ubuntu-upgrade-linux-image-6-8-0-1010-azure ubuntu-upgrade-linux-image-6-8-0-1010-azure-fde ubuntu-upgrade-linux-image-6-8-0-1010-gcp ubuntu-upgrade-linux-image-6-8-0-1011-aws ubuntu-upgrade-linux-image-6-8-0-38-generic ubuntu-upgrade-linux-image-6-8-0-38-generic-64k ubuntu-upgrade-linux-image-6-8-0-38-lowlatency ubuntu-upgrade-linux-image-6-8-0-38-lowlatency-64k ubuntu-upgrade-linux-image-aws ubuntu-upgrade-linux-image-azure ubuntu-upgrade-linux-image-azure-fde ubuntu-upgrade-linux-image-gcp ubuntu-upgrade-linux-image-generic ubuntu-upgrade-linux-image-generic-64k ubuntu-upgrade-linux-image-generic-64k-hwe-24-04 ubuntu-upgrade-linux-image-generic-hwe-24-04 ubuntu-upgrade-linux-image-generic-lpae ubuntu-upgrade-linux-image-gke ubuntu-upgrade-linux-image-ibm ubuntu-upgrade-linux-image-ibm-classic ubuntu-upgrade-linux-image-ibm-lts-24-04 ubuntu-upgrade-linux-image-intel ubuntu-upgrade-linux-image-kvm ubuntu-upgrade-linux-image-lowlatency ubuntu-upgrade-linux-image-lowlatency-64k ubuntu-upgrade-linux-image-nvidia ubuntu-upgrade-linux-image-nvidia-64k ubuntu-upgrade-linux-image-oem-24-04 ubuntu-upgrade-linux-image-oem-24-04a ubuntu-upgrade-linux-image-oracle ubuntu-upgrade-linux-image-oracle-64k ubuntu-upgrade-linux-image-raspi ubuntu-upgrade-linux-image-virtual ubuntu-upgrade-linux-image-virtual-hwe-24-04 References https://attackerkb.com/topics/cve-2024-35929 CVE - 2024-35929 USN-6893-1 USN-6893-2 USN-6893-3 USN-6918-1
