{ "document":{ "aggregate_severity":{ "namespace":"https://nvd.nist.gov/vuln-metrics/cvss", "text":"MEDIUM" }, "category":"csaf_vex", "csaf_version":"2.0", "distribution":{ "tlp":{ "label":"WHITE", "url":"https:/www.first.org/tlp/" } }, "lang":"en", "notes":[ { "text":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to don't set SB_RDONLY in f2fs_handle_critical_error()\n\nsyzbot reports a f2fs bug as below:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 58 at kernel/rcu/sync.c:177 rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177\nCPU: 1 UID: 0 PID: 58 Comm: kworker/1:2 Not tainted 6.10.0-syzkaller-12562-g1722389b0d86 #0\nWorkqueue: events destroy_super_work\nRIP: 0010:rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177\nCall Trace:\n percpu_free_rwsem+0x41/0x80 kernel/locking/percpu-rwsem.c:42\n destroy_super_work+0xec/0x130 fs/super.c:282\n process_one_work kernel/workqueue.c:3231 [inline]\n process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312\n worker_thread+0x86d/0xd40 kernel/workqueue.c:3390\n kthread+0x2f0/0x390 kernel/kthread.c:389\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\nAs Christian Brauner pointed out [1]: the root cause is f2fs sets\nSB_RDONLY flag in internal function, rather than setting the flag\ncovered w/ sb->s_umount semaphore via remount procedure, then below\nrace condition causes this bug:\n\n- freeze_super()\n - sb_wait_write(sb, SB_FREEZE_WRITE)\n - sb_wait_write(sb, SB_FREEZE_PAGEFAULT)\n - sb_wait_write(sb, SB_FREEZE_FS)\n\t\t\t\t\t- f2fs_handle_critical_error\n\t\t\t\t\t - sb->s_flags |= SB_RDONLY\n- thaw_super\n - thaw_super_locked\n - sb_rdonly() is true, so it skips\n sb_freeze_unlock(sb, SB_FREEZE_FS)\n - deactivate_locked_super\n\nSince f2fs has almost the same logic as ext4 [2] when handling critical\nerror in filesystem if it mounts w/ errors=remount-ro option:\n- set CP_ERROR_FLAG flag which indicates filesystem is stopped\n- record errors to superblock\n- set SB_RDONLY falg\nOnce we set CP_ERROR_FLAG flag, all writable interfaces can detect the\nflag and stop any further updates on filesystem. So, it is safe to not\nset SB_RDONLY flag, let's remove the logic and keep in line w/ ext4 [3].\n\n[1] https://lore.kernel.org/all/20240729-himbeeren-funknetz-96e62f9c7aee@brauner\n[2] https://lore.kernel.org/all/20240729132721.hxih6ehigadqf7wx@quack3\n[3] https://lore.kernel.org/linux-ext4/20240805201241.27286-1-jack@suse.cz", "category":"general", "title":"Synopsis" } ], "publisher":{ "issuing_authority":"openEuler security committee", "name":"openEuler", "namespace":"https://www.openeuler.org", "contact_details":"openeuler-security@openeuler.org", "category":"vendor" }, "references":[ { "summary":"nvd cve", "category":"external", "url":"https://nvd.nist.gov/vuln/detail/CVE-2024-47689" }, { "summary":"CVE-2024-47689 vex file", "category":"self", "url":"https://repo.openeuler.org/security/data/csaf/cve/2024/csaf-openeuler-cve-2024-47689.json" }, { "summary":"openEuler-SA-2024-2325", "category":"self", "url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2024-2325" }, { "summary":"CVE-2024-47689", "category":"self", "url":"https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2024-47689&packageName=kernel" } ], "title":"openEuler cve CVE-2024-47689", "tracking":{ "initial_release_date":"2024-11-01T20:18:35+08:00", "revision_history":[ { "date":"2024-11-01T20:18:35+08:00", "summary":"Initial", "number":"1.0.0" } ], "generator":{ "date":"2024-11-01T20:18:35+08:00", "engine":{ "name":"openEuler CSAF Tool V1.0" } }, "current_release_date":"2024-11-01T20:18:35+08:00", "id":"CVE-2024-47689", "version":"1.0.0", "status":"interim" } }, "product_tree":{ "branches":[ { "name":"openEuler", "category":"vendor", "branches":[ { "name":"openEuler", "branches":[ { "product":{ "product_identification_helper":{ "cpe":"cpe:/a:openEuler:openEuler:24.03-LTS" }, "product_id":"openEuler-24.03-LTS", "name":"openEuler-24.03-LTS" }, "name":"openEuler-24.03-LTS", 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f2fs_handle_critical_error()\n\nsyzbot reports a f2fs bug as below:\n\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 58 at kernel/rcu/sync.c:177 rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177\nCPU: 1 UID: 0 PID: 58 Comm: kworker/1:2 Not tainted 6.10.0-syzkaller-12562-g1722389b0d86 #0\nWorkqueue: events destroy_super_work\nRIP: 0010:rcu_sync_dtor+0xcd/0x180 kernel/rcu/sync.c:177\nCall Trace:\n percpu_free_rwsem+0x41/0x80 kernel/locking/percpu-rwsem.c:42\n destroy_super_work+0xec/0x130 fs/super.c:282\n process_one_work kernel/workqueue.c:3231 [inline]\n process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3312\n worker_thread+0x86d/0xd40 kernel/workqueue.c:3390\n kthread+0x2f0/0x390 kernel/kthread.c:389\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244\n\nAs Christian Brauner pointed out [1]: the root cause is f2fs sets\nSB_RDONLY flag in internal function, rather than setting the flag\ncovered w/ sb->s_umount semaphore via remount procedure, then below\nrace condition causes this bug:\n\n- freeze_super()\n - sb_wait_write(sb, SB_FREEZE_WRITE)\n - sb_wait_write(sb, SB_FREEZE_PAGEFAULT)\n - sb_wait_write(sb, SB_FREEZE_FS)\n\t\t\t\t\t- f2fs_handle_critical_error\n\t\t\t\t\t - sb->s_flags |= SB_RDONLY\n- thaw_super\n - thaw_super_locked\n - sb_rdonly() is true, so it skips\n sb_freeze_unlock(sb, SB_FREEZE_FS)\n - deactivate_locked_super\n\nSince f2fs has almost the same logic as ext4 [2] when handling critical\nerror in filesystem if it mounts w/ errors=remount-ro option:\n- set CP_ERROR_FLAG flag which indicates filesystem is stopped\n- record errors to superblock\n- set SB_RDONLY falg\nOnce we set CP_ERROR_FLAG flag, all writable interfaces can detect the\nflag and stop any further updates on filesystem. So, it is safe to not\nset SB_RDONLY flag, let's remove the logic and keep in line w/ ext4 [3].\n\n[1] https://lore.kernel.org/all/20240729-himbeeren-funknetz-96e62f9c7aee@brauner\n[2] https://lore.kernel.org/all/20240729132721.hxih6ehigadqf7wx@quack3\n[3] https://lore.kernel.org/linux-ext4/20240805201241.27286-1-jack@suse.cz", "category":"description", "title":"Vulnerability Description" } ], "product_status":{ "fixed":[ "openEuler-24.03-LTS:bpftool-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-devel-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-headers-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-source-6.6.0-48.0.0.53.oe2403.x86_64", 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], "scores":[ { "cvss_v3":{ "baseSeverity":"MEDIUM", "baseScore":5.3, "vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version":"3.1" }, "products":[ "openEuler-24.03-LTS:bpftool-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:bpftool-debuginfo-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-debuginfo-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-debugsource-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-devel-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-headers-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-source-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-tools-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-tools-debuginfo-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:kernel-tools-devel-6.6.0-48.0.0.53.oe2403.x86_64", "openEuler-24.03-LTS:perf-6.6.0-48.0.0.53.oe2403.x86_64", 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"openEuler-24.03-LTS:kernel-tools-devel-6.6.0-48.0.0.53.oe2403.aarch64", "openEuler-24.03-LTS:perf-6.6.0-48.0.0.53.oe2403.aarch64", "openEuler-24.03-LTS:perf-debuginfo-6.6.0-48.0.0.53.oe2403.aarch64", "openEuler-24.03-LTS:python3-perf-6.6.0-48.0.0.53.oe2403.aarch64", "openEuler-24.03-LTS:python3-perf-debuginfo-6.6.0-48.0.0.53.oe2403.aarch64" ] } ], "threats":[ { "details":"Medium", "category":"impact" } ], "title":"CVE-2024-47689" } ] }