Rocky Linux: CVE-2021-46972: kernel-rt (Multiple Advisories)
Description
In the Linux kernel, the following vulnerability has been resolved: ovl: fix leaked dentry Since commit 6815f479ca90 ("ovl: use only uppermetacopy state in ovl_lookup()"), overlayfs doesn't put temporary dentry when there is a metacopy error, which leads to dentry leaks when shutting down the related superblock: overlayfs: refusing to follow metacopy origin for (/file0) ... BUG: Dentry (____ptrval____){i=3f33,n=file3} still in use (1) [unmount of overlay overlay] ... WARNING: CPU: 1 PID: 432 at umount_check.cold+0x107/0x14d CPU: 1 PID: 432 Comm: unmount-overlay Not tainted 5.12.0-rc5 #1 ... RIP: 0010:umount_check.cold+0x107/0x14d ... Call Trace: d_walk+0x28c/0x950 ? dentry_lru_isolate+0x2b0/0x2b0 ? __kasan_slab_free+0x12/0x20 do_one_tree+0x33/0x60 shrink_dcache_for_umount+0x78/0x1d0 generic_shutdown_super+0x70/0x440 kill_anon_super+0x3e/0x70 deactivate_locked_super+0xc4/0x160 deactivate_super+0xfa/0x140 cleanup_mnt+0x22e/0x370 __cleanup_mnt+0x1a/0x30 task_work_run+0x139/0x210 do_exit+0xb0c/0x2820 ? __kasan_check_read+0x1d/0x30 ? find_held_lock+0x35/0x160 ? lock_release+0x1b6/0x660 ? mm_update_next_owner+0xa20/0xa20 ? reacquire_held_locks+0x3f0/0x3f0 ? __sanitizer_cov_trace_const_cmp4+0x22/0x30 do_group_exit+0x135/0x380 __do_sys_exit_group.isra.0+0x20/0x20 __x64_sys_exit_group+0x3c/0x50 do_syscall_64+0x45/0x70 entry_SYSCALL_64_after_hwframe+0x44/0xae ... VFS: Busy inodes after unmount of overlay. Self-destruct in 5 seconds. Have a nice day... This fix has been tested with a syzkaller reproducer.
Solution(s)
- rocky-upgrade-bpftool
- rocky-upgrade-bpftool-debuginfo
- rocky-upgrade-kernel
- rocky-upgrade-kernel-abi-stablelists
- rocky-upgrade-kernel-core
- rocky-upgrade-kernel-cross-headers
- rocky-upgrade-kernel-debug
- rocky-upgrade-kernel-debug-core
- rocky-upgrade-kernel-debug-debuginfo
- rocky-upgrade-kernel-debug-devel
- rocky-upgrade-kernel-debug-modules
- rocky-upgrade-kernel-debug-modules-extra
- rocky-upgrade-kernel-debuginfo
- rocky-upgrade-kernel-debuginfo-common-aarch64
- rocky-upgrade-kernel-debuginfo-common-x86_64
- rocky-upgrade-kernel-devel
- rocky-upgrade-kernel-doc
- rocky-upgrade-kernel-headers
- rocky-upgrade-kernel-modules
- rocky-upgrade-kernel-modules-extra
- rocky-upgrade-kernel-rt
- rocky-upgrade-kernel-rt-core
- rocky-upgrade-kernel-rt-debug
- rocky-upgrade-kernel-rt-debug-core
- rocky-upgrade-kernel-rt-debug-debuginfo
- rocky-upgrade-kernel-rt-debug-devel
- rocky-upgrade-kernel-rt-debug-kvm
- rocky-upgrade-kernel-rt-debug-modules
- rocky-upgrade-kernel-rt-debug-modules-extra
- rocky-upgrade-kernel-rt-debuginfo
- rocky-upgrade-kernel-rt-debuginfo-common-x86_64
- rocky-upgrade-kernel-rt-devel
- rocky-upgrade-kernel-rt-kvm
- rocky-upgrade-kernel-rt-modules
- rocky-upgrade-kernel-rt-modules-extra
- rocky-upgrade-kernel-tools
- rocky-upgrade-kernel-tools-debuginfo
- rocky-upgrade-kernel-tools-libs
- rocky-upgrade-kernel-tools-libs-devel
- rocky-upgrade-perf
- rocky-upgrade-perf-debuginfo
- rocky-upgrade-python3-perf
- rocky-upgrade-python3-perf-debuginfo
- Lightweight Endpoint Agent
- Live Dashboards
- Real Risk Prioritization
- IT-Integrated Remediation Projects
- Cloud, Virtual, and Container Assessment
- Integrated Threat Feeds
- Easy-to-Use RESTful API
- Automation-Assisted Patching
- Automated Containment
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