In the Linux kernel, the following vulnerability has been resolved:
SUNRPC: Fix RPC client cleaned up the freed pipefs dentries
RPC client pipefs dentries cleanup is in separated rpc_remove_pipedir() workqueue,which takes care about pipefs superblock locking. In some special scenarios, when kernel frees the pipefs sb of the current client and immediately alloctes a new pipefs sb, rpc_remove_pipedir function would misjudge the existence of pipefs sb which is not the one it used to hold. As a result, the rpc_remove_pipedir would clean the released freed pipefs dentries.
To fix this issue, rpc_remove_pipedir should check whether the current pipefs sb is consistent with the original pipefs sb.
This error can be catched by KASAN: ========================================================= [ 250.497700] BUG: KASAN: slab-use-after-free in dget_parent+0x195/0x200 [ 250.498315] Read of size 4 at addr ffff88800a2ab804 by task kworker/0:18/106503 [ 250.500549] Workqueue: events rpc_free_client_work [ 250.501001] Call Trace: [ 250.502880] kasan_report+0xb6/0xf0 [ 250.503209] ? dget_parent+0x195/0x200 [ 250.503561] dget_parent+0x195/0x200 [ 250.503897] ? __pfx_rpc_clntdir_depopulate+0x10/0x10 [ 250.504384] rpc_rmdir_depopulate+0x1b/0x90 [ 250.504781] rpc_remove_client_dir+0xf5/0x150 [ 250.505195] rpc_free_client_work+0xe4/0x230 [ 250.505598] process_one_work+0x8ee/0x13b0 ... [ 22.039056] Allocated by task 244: [ 22.039390] kasan_save_stack+0x22/0x50 [ 22.039758] kasan_set_track+0x25/0x30 [ 22.040109] __kasan_slab_alloc+0x59/0x70 [ 22.040487] kmem_cache_alloc_lru+0xf0/0x240 [ 22.040889] __d_alloc+0x31/0x8e0 [ 22.041207] d_alloc+0x44/0x1f0 [ 22.041514] __rpc_lookup_create_exclusive+0x11c/0x140 [ 22.041987] rpc_mkdir_populate.constprop.0+0x5f/0x110 [ 22.042459] rpc_create_client_dir+0x34/0x150 [ 22.042874] rpc_setup_pipedir_sb+0x102/0x1c0 [ 22.043284] rpc_client_register+0x136/0x4e0 [ 22.043689] rpc_new_client+0x911/0x1020 [ 22.044057] rpc_create_xprt+0xcb/0x370 [ 22.044417] rpc_create+0x36b/0x6c0 ... [ 22.049524] Freed by task 0: [ 22.049803] kasan_save_stack+0x22/0x50 [ 22.050165] kasan_set_track+0x25/0x30 [ 22.050520] kasan_save_free_info+0x2b/0x50 [ 22.050921] __kasan_slab_free+0x10e/0x1a0 [ 22.051306] kmem_cache_free+0xa5/0x390 [ 22.051667] rcu_core+0x62c/0x1930 [ 22.051995] __do_softirq+0x165/0x52a [ 22.052347] [ 22.052503] Last potentially related work creation: [ 22.052952] kasan_save_stack+0x22/0x50 [ 22.053313] __kasan_record_aux_stack+0x8e/0xa0 [ 22.053739] __call_rcu_common.constprop.0+0x6b/0x8b0 [ 22.054209] dentry_free+0xb2/0x140 [ 22.054540] __dentry_kill+0x3be/0x540 [ 22.054900] shrink_dentry_list+0x199/0x510 [ 22.055293] shrink_dcache_parent+0x190/0x240 [ 22.055703] do_one_tree+0x11/0x40 [ 22.056028] shrink_dcache_for_umount+0x61/0x140 [ 22.056461] generic_shutdown_super+0x70/0x590 [ 22.056879] kill_anon_super+0x3a/0x60 [ 22.057234] rpc_kill_sb+0x121/0x200
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-rt-kvmUpgrade kernelUpgrade kernel-debugUpgrade perfUpgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-rt-debugUpgrade kernel-rt-develUpgrade kernel-rt-coreUpgrade kernel-rt-debug-coreUpgrade kernel-debug-modulesUpgrade kernel-rt-debug-modulesUpgrade kernel-rt-modules-extraUpgrade kernel-rtUpgrade kernel-modules-extraUpgrade kernel-debug-coreUpgrade kernel-cross-headersUpgrade kernel-rt-modulesUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-develUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernel-debug-develUpgrade kernel-coreUpgrade kernel-headersUpgrade kernel-modulesUpgrade kernel-zfcpdump-modulesUpgrade kernel-zfcpdumpUpgrade kernel-zfcpdump-develUpgrade kernel-rt-debug-develUpgrade kernel-zfcpdump-coreUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debug-modules-extraUpgrade kernel-rt-debug-kvmUpgrade kernel-tools-libs-develUpgrade kernel-doc | Aug 12, 2024 | May 21, 2024 |
| Amazon Linux Ami 2 | — | Upgrade kernel-livepatch-4.14.349-266.564Upgrade kernel-headersUpgrade kernel-livepatch-5.15.145-95.156Upgrade kernel-toolsUpgrade perf-debuginfoUpgrade perfUpgrade python-perf-debuginfoUpgrade kernelUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-5.10.205-195.804Upgrade python-perfUpgrade kernel-develUpgrade bpftool-debuginfo | Jun 26, 2024 | May 21, 2024 |
| Amazon_linux_2023 | — | Upgrade python3-perf-debuginfoUpgrade kernel-debuginfoUpgrade kernel-libbpf-staticUpgrade perfUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-livepatch-6.1.66-91.160Upgrade kernel-tools-develUpgrade kernel-libbpfUpgrade kernel-modules-extraUpgrade kernel-libbpf-develUpgrade kernelUpgrade kernel-headersUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade perf-debuginfoUpgrade kernel-tools | Feb 17, 2025 | May 21, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade python3-perfUpgrade kernel-toolsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools-libs | Oct 8, 2024 | May 21, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade kernelUpgrade kernel-toolsUpgrade kernel-tools-libsUpgrade python3-perf | Oct 8, 2024 | May 21, 2024 |
| Oracle_linux | — | Upgrade kernelUpgrade kernel-uek | Aug 16, 2024 | May 21, 2024 |
| Redhat_linux | — | No solution existsUpgrade kernelUpgrade kernel-rt | Aug 12, 2024 | May 21, 2024 |
| Rocky_linux | — | Upgrade kernel-debugUpgrade kernel-debuginfoUpgrade kernel-coreUpgrade kernel-debug-debuginfoUpgrade kernelUpgrade kernel-tools-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-rt-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-modules-extraUpgrade kernel-rt-coreUpgrade kernel-rt-debug-modulesUpgrade kernel-debug-coreUpgrade kernel-debug-modulesUpgrade kernel-rt-develUpgrade kernel-rt-debugUpgrade kernel-rt-modules-extraUpgrade kernel-debug-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debug-coreUpgrade bpftoolUpgrade kernel-rt-kvmUpgrade kernel-rt-debug-debuginfoUpgrade kernel-tools-libsUpgrade kernel-cross-headersUpgrade kernel-modulesUpgrade perf-debuginfoUpgrade kernel-rt-debug-kvmUpgrade perfUpgrade kernel-headersUpgrade kernel-rt-modulesUpgrade kernel-rt-debug-modules-extraUpgrade kernel-tools-libs-develUpgrade kernel-rtUpgrade python3-perfUpgrade kernel-toolsUpgrade kernel-rt-debug-devel | Aug 22, 2024 | May 21, 2024 |
| Suse | — | Upgrade kernel-azure-develUpgrade dtb-amlogicUpgrade kernel-rt-extraUpgrade dtb-apmUpgrade dtb-nvidiaUpgrade dlm-kmp-rtUpgrade kernel-azure-vdsoUpgrade kernel-defaultUpgrade kernel-obs-qaUpgrade cluster-md-kmp-defaultUpgrade kernel-debug-livepatch-develUpgrade reiserfs-kmp-64kbUpgrade dtb-hisiliconUpgrade kernel-azure-baseUpgrade dtb-marvellUpgrade kernel-azure-extraUpgrade ocfs2-kmp-64kbUpgrade kernel-azure-livepatch-develUpgrade kernel-default-baseUpgrade kernel-64kb-optionalUpgrade dtb-amdUpgrade kernel-default-manUpgrade kernel-default-livepatchUpgrade kernel-rt_debug-vdsoUpgrade reiserfs-kmp-rtUpgrade kernel-source-rtUpgrade kernel-syms-rtUpgrade kernel-kvmsmall-livepatch-develUpgrade dlm-kmp-azureUpgrade kernel-debug-develUpgrade kernel-rt_debugUpgrade cluster-md-kmp-64kbUpgrade kernel-rt-livepatch-develUpgrade kernel-obs-buildUpgrade kernel-docsUpgrade kernel-docs-htmlUpgrade kernel-rt-optionalUpgrade dtb-broadcomUpgrade dlm-kmp-defaultUpgrade kernel-default-livepatch-develUpgrade kselftests-kmp-rtUpgrade dtb-socionextUpgrade kernel-default-extraUpgrade kernel-macrosUpgrade kernel-kvmsmall-vdsoUpgrade dtb-renesasUpgrade kernel-kvmsmallUpgrade ocfs2-kmp-rtUpgrade kernel-rt-vdsoUpgrade kselftests-kmp-defaultUpgrade dtb-appleUpgrade dtb-sprdUpgrade kernel-debug-vdsoUpgrade kernel-default-develUpgrade dtb-xilinxUpgrade dtb-freescaleUpgrade kernel-64kb-livepatch-develUpgrade dtb-exynosUpgrade kernel-kvmsmall-develUpgrade kernel-source-vanillaUpgrade kernel-rt_debug-develUpgrade dtb-allwinnerUpgrade kernel-64kb-develUpgrade kernel-develUpgrade dlm-kmp-64kbUpgrade reiserfs-kmp-defaultUpgrade gfs2-kmp-64kbUpgrade dtb-qcomUpgrade dtb-amazonUpgrade kernel-syms-azureUpgrade gfs2-kmp-rtUpgrade ocfs2-kmp-defaultUpgrade kernel-source-azureUpgrade kernel-64kbUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-64kb-extraUpgrade reiserfs-kmp-azureUpgrade ocfs2-kmp-azureUpgrade cluster-md-kmp-azureUpgrade kernel-azure-optionalUpgrade kernel-rtUpgrade kselftests-kmp-azureUpgrade kernel-debugUpgrade kernel-default-optionalUpgrade gfs2-kmp-defaultUpgrade gfs2-kmp-azureUpgrade cluster-md-kmp-rtUpgrade dtb-rockchipUpgrade dtb-lgUpgrade dtb-armUpgrade kernel-default-vdsoUpgrade kernel-devel-azureUpgrade kernel-rt-develUpgrade kernel-devel-rtUpgrade kernel-azureUpgrade kernel-symsUpgrade dtb-caviumUpgrade kernel-default-base-rebuildUpgrade kselftests-kmp-64kbUpgrade kernel-sourceUpgrade kernel-rt-livepatchUpgrade dtb-alteraUpgrade dtb-mediatekUpgrade kernel-zfcpdump | Jun 12, 2024 | May 21, 2024 |
| Ubuntu | — | Upgrade linux-image-bluefieldUpgrade linux-image-gcp-lts-20.04Upgrade linux-image-gkeopUpgrade linux-image-generic-lpaeUpgrade linux-image-oem-osp1Upgrade linux-image-5.4.0-1137-azureUpgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-5.4.0-1136-gcpUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-virtualUpgrade linux-image-raspi2-hwe-18.04Upgrade linux-image-generic-hwe-18.04Upgrade linux-image-5.4.0-195-lowlatencyUpgrade linux-image-5.4.0-1051-xilinx-zynqmpUpgrade linux-image-5.4.0-1116-raspiUpgrade linux-image-genericUpgrade linux-image-5.4.0-195-genericUpgrade linux-image-oracleUpgrade linux-image-raspi2Upgrade linux-image-virtual-hwe-18.04Upgrade linux-image-5.4.0-1132-awsUpgrade linux-image-gcpUpgrade linux-image-azure-lts-20.04Upgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-5.4.0-195-generic-lpaeUpgrade linux-image-5.4.0-1131-oracleUpgrade linux-image-raspiUpgrade linux-image-lowlatencyUpgrade linux-image-oemUpgrade linux-image-5.4.0-1043-iotUpgrade linux-image-gkeop-5.4Upgrade linux-image-ibmUpgrade linux-image-5.4.0-1079-ibmUpgrade linux-image-5.4.0-1092-bluefieldUpgrade linux-image-5.4.0-1120-kvmUpgrade linux-image-5.4.0-1099-gkeopUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-aws-lts-20.04Upgrade linux-image-azureUpgrade linux-image-ibm-lts-20.04Upgrade linux-image-kvmUpgrade linux-image-aws | Sep 13, 2024 | May 21, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | May 21, 2024 |
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