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[PATCH OLK-5.10] ksmbd: require 3 sub-authorities before reading sub_auth[2]
by Li Lingfeng 15 May '26

15 May '26

From: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> mainline inclusion from mainline-v7.1-rc1 commit 53370cf9090777774e07fd9a8ebce67c6cc333ab category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14354 CVE: CVE-2026-31611 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- ksmbd: require 3 sub-authorities before reading sub_auth[2] parse_dacl() compares each ACE SID against sid_unix_NFS_mode and on match reads sid.sub_auth[2] as the file mode. If sid_unix_NFS_mode is the prefix S-1-5-88-3 with num_subauth = 2 then compare_sids() compares only min(num_subauth, 2) sub-authorities so a client SID with num_subauth = 2 and sub_auth = {88, 3} will match. If num_subauth = 2 and the ACE is placed at the very end of the security descriptor, sub_auth[2] will be 4 bytes past end_of_acl. The out-of-band bytes will then be masked to the low 9 bits and applied as the file's POSIX mode, probably not something that is good to have happen. Fix this up by forcing the SID to actually carry a third sub-authority before reading it at all. Cc: Namjae Jeon <linkinjeon(a)kernel.org> Cc: Steve French <smfrench(a)gmail.com> Cc: Sergey Senozhatsky <senozhatsky(a)chromium.org> Cc: Tom Talpey <tom(a)talpey.com> Cc: linux-cifs(a)vger.kernel.org Cc: <stable(a)kernel.org> Assisted-by: gregkh_clanker_t1000 Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Acked-by: Namjae Jeon <linkinjeon(a)kernel.org> Signed-off-by: Steve French <stfrench(a)microsoft.com> Conflicts: fs/smb/server/smbacl.c fs/ksmbd/smbacl.c [File Path Difference] Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- fs/ksmbd/smbacl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c index 3368a4e73773..859b88f0de88 100644 --- a/fs/ksmbd/smbacl.c +++ b/fs/ksmbd/smbacl.c @@ -439,7 +439,8 @@ static void parse_dacl(struct smb_acl *pdacl, char *end_of_acl, ppace[i]->access_req = smb_map_generic_desired_access(ppace[i]->access_req); - if (!(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) { + if (ppace[i]->sid.num_subauth >= 3 && + !(compare_sids(&ppace[i]->sid, &sid_unix_NFS_mode))) { fattr->cf_mode = le32_to_cpu(ppace[i]->sid.sub_auth[2]); break; -- 2.52.0

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[PATCH OLK-6.6 v12 0/6] SMT QOS
by Jinjie Ruan 15 May '26

15 May '26

Cloud Service Provider deploy Best-Effort and Latency Sensitive tasks on the same physical core to maximize the resource utilization. We observe the LS task needs more cycles to complete the same workload due to the Microarchitectural resource contention. This feature control the instruction throughput of BE task into pipeline, so that the other SMT running LS task could occupy more uarch resources to reach better IPC. First split out QOS_LABEL from QOS_SCHED for SMT QoS reuse. The test results on HIP12: | 1. online 30% | 基线 | 混布基线 | SMT QoS | | ---------------------------- | ------ | -------- | ------- | | sched_wfi_timeout_us | \ | \ | 50 | | sched_smt_offline_util_pct | \ | \ | 50 | | P99 | 0.2 | 0.303 | 0.21 | | CPU utilization | 28.9% | 66.70% | 64.7% | | P99 regression percentage | \ | 51.5% | 5.00% | | spark CPEMAN | \ | 1.29 | 0.967 | | spark CPEMAN> regression | \ | \ | 25.04% | | 2. online 40% | 基线 | 混布基线 | SMT QoS | | ---------------------------- | ------ | -------- | ------- | | sched_wfi_timeout_us | \ | \ | 50 | | sched_smt_offline_util_pct | \ | \ | 50 | | P99 | 0.21 | 0.286 | 0.206 | | CPU utilization | 40.0% | 69.30% | 65.5% | | P99 regression percentage | \ | 36.19% | -1.9% | | spark CPEMAN | \ | 1.03 | 0.661 | | spark CPEMAN> regression | \ | \ | 35.83% | | 3. online 48% | 基线 | 混布基线 | SMT QoS | | ---------------------------- | ------ | -------- | ------- | | sched_wfi_timeout_us | \ | \ | 50 | | sched_smt_offline_util_pct | \ | \ | 50 | | P99 | 0.209 | 0.275 | 0.202 | | CPU utilization | 40.0% | 74.60% | 64.9% | | P99 regression percentage | \ | 31.58% | -3.35% | | spark CPEMAN | \ | 0.92 | 0.503 | | spark CPEMAN> regression | \ | \ | 45.33% | Changes in v12: - Fix backup_select_cpus not set NULL. - Use separate patch to move dynamic affinity helper functions to sched.h - include smt_qos.c in build_policy.c. - Simplify set_qos_task_select_cpus(). Changes in v11: - Fix `mrs x21,icc_iar1_el1' build issue. - Fix set_qos_task_select_cpus() "idlest_cpu" bug. - Fix restore_qos_task_select_cpus() smt_qos_enabled() check. - Use regs->orig_x0 instead of percpu cpu_iar. - Call arch_timer_get_cntfrq() once initially. - Remove extra qos_sched_enabled() check in qos_schedule_throttle(). - Move most smt qos code in fair.c to smt_qos.c. - Add smt_qos_enabled() check in smt_qos_update_sg_lb_stats() - Remove extra cpumask_copy() in set_qos_task_select_cpus(). - Add boundary case handling for when prefer_cpus is empty. Changes in v10: - Decouple QOS_SCHED_SMT_EXPELLER and QOS_SCHED scheduling logic with SMT_QOS. - Some cleanup. Changes in v9: - Also use SMT sibling CPU utilization NUMA level watermark for offline task cpu select to improve the 920G CPU utilization. Chanegs in v8: - Use SMT sibling CPU utilization NUMA level watermark instead of src cpu offline tasks migrate watermark on every load balance. Changes in v7: - Fix the prefer_cpu and select_cpus save/restore. - Extract can_smt_qos_migrate_task() helper from can_migrate_task(). - Update the names. - Update the arch code and remove the pmu code. - Add some comment. Changes in v6: - Rename QOS_LABEL to QOS_LEVEL. - Rename USER_WFXT to SMT_QOS. - Rename TAG_PULL to SMT_TAG_PULL. - Adjust the select cpu code which depends on QOS_SCHED_DYNAMIC_AFFINITY. - Distribute offline tasks to SMT sibling cores based on the configured proportion move to a separate patch. - Use cpumask_t for even_cpu_mask. - smt_throttle move to the arch patch. - pmu_smt_update_status() -> smt_update_qos_level(). - >> smt_task_imbalance instead of / 1000. - Remove the limit for odd -> even load balance, which solve the one NUMA load very high problem. - Rebased on the newest OLK-6.6 code. - Fix the build issue for QOS_LEVEL selected but CGROUP_SCHED or CFS_BANDWIDTH not selected. Jinjie Ruan (6): sched: Split out QOS_LEVEL from QOS_SCHED for reuse sched: Add qos_sched_enabled() helper for future expansion sched/fair: Move dynamic affinity helper functions to sched.h sched/fair: Add SMT QoS sched core code arm64: Add arch code for SMT QoS config: Enable SMT_QOS arch/arm64/Kconfig.turbo | 17 ++ arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/include/asm/cpufeature.h | 5 + arch/arm64/include/asm/xint.h | 13 ++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/entry-common.c | 13 ++ arch/arm64/kernel/entry.S | 14 +- arch/arm64/kernel/smp.c | 23 +++ arch/arm64/kernel/smt_qos.c | 87 ++++++++++ arch/arm64/kernel/xcall/entry.S | 77 +++++++++ drivers/irqchip/irq-gic-v3.c | 38 +++++ include/linux/sched.h | 20 +++ init/Kconfig | 5 + kernel/sched/build_policy.c | 4 + kernel/sched/core.c | 20 +-- kernel/sched/fair.c | 107 ++++++++----- kernel/sched/features.h | 4 + kernel/sched/sched.h | 86 ++++++++-- kernel/sched/smt_qos.c | 209 +++++++++++++++++++++++++ 19 files changed, 676 insertions(+), 68 deletions(-) create mode 100644 arch/arm64/include/asm/xint.h create mode 100644 arch/arm64/kernel/smt_qos.c create mode 100644 kernel/sched/smt_qos.c -- 2.34.1

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[PATCH OLK-6.6 v12 0/6] SMT QOS
by Jinjie Ruan 15 May '26

15 May '26

Cloud Service Provider deploy Best-Effort and Latency Sensitive tasks on the same physical core to maximize the resource utilization. We observe the LS task needs more cycles to complete the same workload due to the Microarchitectural resource contention. This feature control the instruction throughput of BE task into pipeline, so that the other SMT running LS task could occupy more uarch resources to reach better IPC. First split out QOS_LABEL from QOS_SCHED for SMT QoS reuse. The test results on HIP12: | 1. online 30% | 基线 | 混布基线 | SMT QoS | | sched_wfi_timeout_us | \ | \ | 50 | | sched_smt_offline_util_pct | \ | \ | 50 | | P99 | 0.2 | 0.303 | 0.21 | | CPU utilization | 28.9% | 66.70% | 64.7% | | P99 regression percentage | \ | 51.5% | 5.00% | | spark CPEMAN | \ | 1.29 | 0.967 | | spark CPEMAN> regression | \ | \ | 25.04% | | 2. online 40% | 基线 | 混布基线 | SMT QoS | | sched_wfi_timeout_us | \ | \ | 50 | | sched_smt_offline_util_pct | \ | \ | 50 | | P99 | 0.21 | 0.286 | 0.206 | | CPU utilization | 40.0% | 69.30% | 65.5% | | P99 regression percentage | \ | 36.19% | -1.9% | | spark CPEMAN | \ | 1.03 | 0.661 | | spark CPEMAN> regression | \ | \ | 35.83% | | 3. online 48% | 基线 | 混布基线 | SMT QoS | | sched_wfi_timeout_us | \ | \ | 50 | | sched_smt_offline_util_pct | \ | \ | 50 | | P99 | 0.209 | 0.275 | 0.202 | | CPU utilization | 40.0% | 74.60% | 64.9% | | P99 regression percentage | \ | 31.58% | -3.35% | | spark CPEMAN | \ | 0.92 | 0.503 | | spark CPEMAN> regression | \ | \ | 45.33% | Changes in v12: - Fix backup_select_cpus not set NULL. - Use separate patch to move dynamic affinity helper functions to sched.h - include smt_qos.c in build_policy.c. - Simplify set_qos_task_select_cpus(). Changes in v11: - Fix `mrs x21,icc_iar1_el1' build issue. - Fix set_qos_task_select_cpus() "idlest_cpu" bug. - Fix restore_qos_task_select_cpus() smt_qos_enabled() check. - Use regs->orig_x0 instead of percpu cpu_iar. - Call arch_timer_get_cntfrq() once initially. - Remove extra qos_sched_enabled() check in qos_schedule_throttle(). - Move most smt qos code in fair.c to smt_qos.c. - Add smt_qos_enabled() check in smt_qos_update_sg_lb_stats() - Remove extra cpumask_copy() in set_qos_task_select_cpus(). - Add boundary case handling for when prefer_cpus is empty. Changes in v10: - Decouple QOS_SCHED_SMT_EXPELLER and QOS_SCHED scheduling logic with SMT_QOS. - Some cleanup. Changes in v9: - Also use SMT sibling CPU utilization NUMA level watermark for offline task cpu select to improve the 920G CPU utilization. Chanegs in v8: - Use SMT sibling CPU utilization NUMA level watermark instead of src cpu offline tasks migrate watermark on every load balance. Changes in v7: - Fix the prefer_cpu and select_cpus save/restore. - Extract can_smt_qos_migrate_task() helper from can_migrate_task(). - Update the names. - Update the arch code and remove the pmu code. - Add some comment. Changes in v6: - Rename QOS_LABEL to QOS_LEVEL. - Rename USER_WFXT to SMT_QOS. - Rename TAG_PULL to SMT_TAG_PULL. - Adjust the select cpu code which depends on QOS_SCHED_DYNAMIC_AFFINITY. - Distribute offline tasks to SMT sibling cores based on the configured proportion move to a separate patch. - Use cpumask_t for even_cpu_mask. - smt_throttle move to the arch patch. - pmu_smt_update_status() -> smt_update_qos_level(). - >> smt_task_imbalance instead of / 1000. - Remove the limit for odd -> even load balance, which solve the one NUMA load very high problem. - Rebased on the newest OLK-6.6 code. - Fix the build issue for QOS_LEVEL selected but CGROUP_SCHED or CFS_BANDWIDTH not selected. Jinjie Ruan (6): sched: Split out QOS_LEVEL from QOS_SCHED for reuse sched: Add qos_sched_enabled() helper for future expansion sched/fair: Move dynamic affinity helper functions to sched.h sched/fair: Add SMT QoS sched core code arm64: Add arch code for SMT QoS config: Enable SMT_QOS arch/arm64/Kconfig.turbo | 17 ++ arch/arm64/configs/openeuler_defconfig | 1 + arch/arm64/include/asm/cpufeature.h | 5 + arch/arm64/include/asm/xint.h | 13 ++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/entry-common.c | 13 ++ arch/arm64/kernel/entry.S | 14 +- arch/arm64/kernel/smp.c | 23 +++ arch/arm64/kernel/smt_qos.c | 87 ++++++++++ arch/arm64/kernel/xcall/entry.S | 77 +++++++++ drivers/irqchip/irq-gic-v3.c | 38 +++++ include/linux/sched.h | 20 +++ init/Kconfig | 5 + kernel/sched/build_policy.c | 4 + kernel/sched/core.c | 20 +-- kernel/sched/fair.c | 114 ++++++++------ kernel/sched/features.h | 4 + kernel/sched/sched.h | 93 +++++++++-- kernel/sched/smt_qos.c | 209 +++++++++++++++++++++++++ 19 files changed, 683 insertions(+), 75 deletions(-) create mode 100644 arch/arm64/include/asm/xint.h create mode 100644 arch/arm64/kernel/smt_qos.c create mode 100644 kernel/sched/smt_qos.c -- 2.34.1

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[PATCH OLK-6.6] ceph: add a bunch of missing ceph_path_info initializers
by Pan Taixi 15 May '26

15 May '26

From: Max Kellermann <max.kellermann(a)ionos.com> mainline inclusion from mainline-v7.0-rc4 commit 43323a5934b660afae687e8e4e95ac328615a5c4 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14967 CVE: CVE-2026-43408 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- ceph_mdsc_build_path() must be called with a zero-initialized ceph_path_info parameter, or else the following ceph_mdsc_free_path_info() may crash. Example crash (on Linux 6.18.12): virt_to_cache: Object is not a Slab page! WARNING: CPU: 184 PID: 2871736 at mm/slub.c:6732 kmem_cache_free+0x316/0x400 [...] Call Trace: [...] ceph_open+0x13d/0x3e0 do_dentry_open+0x134/0x480 vfs_open+0x2a/0xe0 path_openat+0x9a3/0x1160 [...] cache_from_obj: Wrong slab cache. names_cache but object is from ceph_inode_info WARNING: CPU: 184 PID: 2871736 at mm/slub.c:6746 kmem_cache_free+0x2dd/0x400 [...] kernel BUG at mm/slub.c:634! Oops: invalid opcode: 0000 [#1] SMP NOPTI RIP: 0010:__slab_free+0x1a4/0x350 Some of the ceph_mdsc_build_path() callers had initializers, but others had not, even though they were all added by commit 15f519e9f883 ("ceph: fix race condition validating r_parent before applying state"). The ones without initializer are suspectible to random crashes. (I can imagine it could even be possible to exploit this bug to elevate privileges.) Unfortunately, these Ceph functions are undocumented and its semantics can only be derived from the code. I see that ceph_mdsc_build_path() initializes the structure only on success, but not on error. Calling ceph_mdsc_free_path_info() after a failed ceph_mdsc_build_path() call does not even make sense, but that's what all callers do, and for it to be safe, the structure must be zero-initialized. The least intrusive approach to fix this is therefore to add initializers everywhere. Cc: stable(a)vger.kernel.org Fixes: 15f519e9f883 ("ceph: fix race condition validating r_parent before applying state") Signed-off-by: Max Kellermann <max.kellermann(a)ionos.com> Reviewed-by: Viacheslav Dubeyko <Slava.Dubeyko(a)ibm.com> Signed-off-by: Ilya Dryomov <idryomov(a)gmail.com> Conflicts: fs/ceph/debugfs.c fs/ceph/dir.c fs/ceph/file.c fs/ceph/inode.c [Context conflicts in fs/ceph/debugfs.c. For other files, struct ceph_path_info path_info are all properly initialized to {0}] Signed-off-by: Pan Taixi <pantaixi1(a)huawei.com> --- fs/ceph/debugfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ceph/debugfs.c b/fs/ceph/debugfs.c index f00b333676d9..b44e44709e0a 100644 --- a/fs/ceph/debugfs.c +++ b/fs/ceph/debugfs.c @@ -79,7 +79,7 @@ static int mdsc_show(struct seq_file *s, void *p) if (req->r_inode) { seq_printf(s, " #%llx", ceph_ino(req->r_inode)); } else if (req->r_dentry) { - struct ceph_path_info path_info; + struct ceph_path_info path_info = {0}; path = ceph_mdsc_build_path(mdsc, req->r_dentry, &path_info, 0); if (IS_ERR(path)) @@ -99,7 +99,7 @@ static int mdsc_show(struct seq_file *s, void *p) } if (req->r_old_dentry) { - struct ceph_path_info path_info; + struct ceph_path_info path_info = {0}; path = ceph_mdsc_build_path(mdsc, req->r_old_dentry, &path_info, 0); if (IS_ERR(path)) -- 2.34.1

2 1

[PATCH OLK-6.6] apei: use blocking notifier for page offline policy chain
by Qi Xi 15 May '26

15 May '26

hulk inclusion category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/9170 ------------------------------------------------------- atomic_notifier_call_chain() holds rcu_read_lock() over callbacks, which prevents sleeping. Notifier callbacks such as ipmi_pso_notifier_call() need to sleep for IPMI completion, triggering a BUG: sleeping function called from invalid context. Switch apei_page_offline_notifier_chain to a blocking notifier to allow callbacks to safely sleep when invoked from sysctl write path. Fixes: 543fadb5575a ("apei/ghes: Add sysctl interface to control soft-offline page isolation") Signed-off-by: Qi Xi <xiqi2(a)huawei.com> --- drivers/acpi/apei/ghes-policy.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/apei/ghes-policy.c b/drivers/acpi/apei/ghes-policy.c index 87c611f2cbaa..0bc12b0ba32b 100644 --- a/drivers/acpi/apei/ghes-policy.c +++ b/drivers/acpi/apei/ghes-policy.c @@ -17,18 +17,18 @@ int sysctl_apei_page_offline_policy __read_mostly = APEI_PAGE_OFFLINE_ALLOW_BASE_PAGE; EXPORT_SYMBOL(sysctl_apei_page_offline_policy); -static ATOMIC_NOTIFIER_HEAD(apei_page_offline_notifier_chain); +static BLOCKING_NOTIFIER_HEAD(apei_page_offline_notifier_chain); int register_apei_page_offline_notifier(struct notifier_block *nb) { - return atomic_notifier_chain_register( + return blocking_notifier_chain_register( &apei_page_offline_notifier_chain, nb); } EXPORT_SYMBOL(register_apei_page_offline_notifier); int unregister_apei_page_offline_notifier(struct notifier_block *nb) { - return atomic_notifier_chain_unregister( + return blocking_notifier_chain_unregister( &apei_page_offline_notifier_chain, nb); } EXPORT_SYMBOL(unregister_apei_page_offline_notifier); @@ -48,7 +48,7 @@ static int apei_page_offline_policy_handler(struct ctl_table *table, pr_debug("APEI policy: 0x%x -> 0x%x\n", old_val, new_val); if ((old_val ^ new_val) & APEI_PAGE_OFFLINE_NOTIFY) - atomic_notifier_call_chain( + blocking_notifier_call_chain( &apei_page_offline_notifier_chain, 0, &new_val); } -- 2.33.0

2 1

[PATCH OLK-6.6] dm: clear cloned request bio pointer when last clone bio completes
by Li Lingfeng 14 May '26

14 May '26

From: Michael Liang <mliang(a)purestorage.com> stable inclusion from stable-v6.6.128 commit 7daf279c674d515fb22a727a7bbc92aeb35c5442 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14830 CVE: CVE-2026-43278 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit fb8a6c18fb9a6561f7a15b58b272442b77a242dd ] Stale rq->bio values have been observed to cause double-initialization of cloned bios in request-based device-mapper targets, leading to use-after-free and double-free scenarios. One such case occurs when using dm-multipath on top of a PCIe NVMe namespace, where cloned request bios are freed during blk_complete_request(), but rq->bio is left intact. Subsequent clone teardown then attempts to free the same bios again via blk_rq_unprep_clone(). The resulting double-free path looks like: nvme_pci_complete_batch() nvme_complete_batch() blk_mq_end_request_batch() blk_complete_request() // called on a DM clone request bio_endio() // first free of all clone bios ... rq->end_io() // end_clone_request() dm_complete_request(tio->orig) dm_softirq_done() dm_done() dm_end_request() blk_rq_unprep_clone() // second free of clone bios Fix this by clearing the clone request's bio pointer when the last cloned bio completes, ensuring that later teardown paths do not attempt to free already-released bios. Signed-off-by: Michael Liang <mliang(a)purestorage.com> Reviewed-by: Mohamed Khalfella <mkhalfella(a)purestorage.com> Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com> Cc: stable(a)vger.kernel.org Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- drivers/md/dm-rq.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 499f8cc8a39f..5bcf020df856 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -109,14 +109,21 @@ static void end_clone_bio(struct bio *clone) */ tio->completed += nr_bytes; + if (!is_last) + return; + /* + * At this moment we know this is the last bio of the cloned request, + * and all cloned bios have been released, so reset the clone request's + * bio pointer to avoid double free. + */ + tio->clone->bio = NULL; + exit: /* * Update the original request. * Do not use blk_mq_end_request() here, because it may complete * the original request before the clone, and break the ordering. */ - if (is_last) - exit: - blk_update_request(tio->orig, BLK_STS_OK, tio->completed); + blk_update_request(tio->orig, BLK_STS_OK, tio->completed); } static struct dm_rq_target_io *tio_from_request(struct request *rq) -- 2.52.0

2 1

[PATCH OLK-6.6] dm: clear cloned request bio pointer when last clone bio completes
by Li Lingfeng 14 May '26

14 May '26

From: Michael Liang <mliang(a)purestorage.com> stable inclusion from stable-v6.6.128 commit 7daf279c674d515fb22a727a7bbc92aeb35c5442 category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8792 CVE: CVE-2026-43278 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit fb8a6c18fb9a6561f7a15b58b272442b77a242dd ] Stale rq->bio values have been observed to cause double-initialization of cloned bios in request-based device-mapper targets, leading to use-after-free and double-free scenarios. One such case occurs when using dm-multipath on top of a PCIe NVMe namespace, where cloned request bios are freed during blk_complete_request(), but rq->bio is left intact. Subsequent clone teardown then attempts to free the same bios again via blk_rq_unprep_clone(). The resulting double-free path looks like: nvme_pci_complete_batch() nvme_complete_batch() blk_mq_end_request_batch() blk_complete_request() // called on a DM clone request bio_endio() // first free of all clone bios ... rq->end_io() // end_clone_request() dm_complete_request(tio->orig) dm_softirq_done() dm_done() dm_end_request() blk_rq_unprep_clone() // second free of clone bios Fix this by clearing the clone request's bio pointer when the last cloned bio completes, ensuring that later teardown paths do not attempt to free already-released bios. Signed-off-by: Michael Liang <mliang(a)purestorage.com> Reviewed-by: Mohamed Khalfella <mkhalfella(a)purestorage.com> Signed-off-by: Mikulas Patocka <mpatocka(a)redhat.com> Cc: stable(a)vger.kernel.org Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- drivers/md/dm-rq.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 499f8cc8a39f..5bcf020df856 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -109,14 +109,21 @@ static void end_clone_bio(struct bio *clone) */ tio->completed += nr_bytes; + if (!is_last) + return; + /* + * At this moment we know this is the last bio of the cloned request, + * and all cloned bios have been released, so reset the clone request's + * bio pointer to avoid double free. + */ + tio->clone->bio = NULL; + exit: /* * Update the original request. * Do not use blk_mq_end_request() here, because it may complete * the original request before the clone, and break the ordering. */ - if (is_last) - exit: - blk_update_request(tio->orig, BLK_STS_OK, tio->completed); + blk_update_request(tio->orig, BLK_STS_OK, tio->completed); } static struct dm_rq_target_io *tio_from_request(struct request *rq) -- 2.52.0

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[PATCH OLK-6.6] smb: client: prevent races in ->query_interfaces()
by Li Lingfeng 14 May '26

14 May '26

From: Henrique Carvalho <henrique.carvalho(a)suse.com> stable inclusion from stable-v6.6.128 commit 93e8e3ee165ae4609a1222b516b573837103d2c3 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14783 CVE: CVE-2026-43239 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit c3c06e42e1527716c54f3ad2ced6a034b5f3a489 ] It was possible for two query interface works to be concurrently trying to update the interfaces. Prevent this by checking and updating iface_last_update under iface_lock. Signed-off-by: Henrique Carvalho <henrique.carvalho(a)suse.com> Signed-off-by: Steve French <stfrench(a)microsoft.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- fs/smb/client/smb2ops.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 40eea0b2f48b..a051f205589a 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -595,13 +595,6 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, p = buf; spin_lock(&ses->iface_lock); - /* do not query too frequently, this time with lock held */ - if (ses->iface_last_update && - time_before(jiffies, ses->iface_last_update + - (SMB_INTERFACE_POLL_INTERVAL * HZ))) { - spin_unlock(&ses->iface_lock); - return 0; - } /* * Go through iface_list and mark them as inactive @@ -624,7 +617,6 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, "Empty network interface list returned by server %s\n", ses->server->hostname); rc = -EOPNOTSUPP; - ses->iface_last_update = jiffies; goto out; } @@ -753,8 +745,6 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, + sizeof(p->Next) && p->Next)) cifs_dbg(VFS, "%s: incomplete interface info\n", __func__); - ses->iface_last_update = jiffies; - out: /* * Go through the list again and put the inactive entries @@ -783,10 +773,17 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon, bool in_ struct TCP_Server_Info *pserver; /* do not query too frequently */ + spin_lock(&ses->iface_lock); if (ses->iface_last_update && time_before(jiffies, ses->iface_last_update + - (SMB_INTERFACE_POLL_INTERVAL * HZ))) + (SMB_INTERFACE_POLL_INTERVAL * HZ))) { + spin_unlock(&ses->iface_lock); return 0; + } + + ses->iface_last_update = jiffies; + + spin_unlock(&ses->iface_lock); rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, FSCTL_QUERY_NETWORK_INTERFACE_INFO, -- 2.52.0

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[PATCH OLK-5.10] ksmbd: use check_add_overflow() to prevent u16 DACL size overflow
by Li Lingfeng 14 May '26

14 May '26

From: Tristan Madani <tristan(a)talencesecurity.com> mainline inclusion from mainline-v7.1-rc1 commit 299f962c0b02d048fb45d248b4da493d03f3175d category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/14454 CVE: CVE-2026-31704 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- set_posix_acl_entries_dacl() and set_ntacl_dacl() accumulate ACE sizes in u16 variables. When a file has many POSIX ACL entries, the accumulated size can wrap past 65535, causing the pointer arithmetic (char *)pndace + *size to land within already-written ACEs. Subsequent writes then overwrite earlier entries, and pndacl->size gets a truncated value. Use check_add_overflow() at each accumulation point to detect the wrap before it corrupts the buffer, consistent with existing check_mul_overflow() usage elsewhere in smbacl.c. Cc: stable(a)vger.kernel.org Fixes: e2f34481b24d ("cifsd: add server-side procedures for SMB3") Signed-off-by: Tristan Madani <tristan(a)talencesecurity.com> Acked-by: Namjae Jeon <linkinjeon(a)kernel.org> Signed-off-by: Steve French <stfrench(a)microsoft.com> Conflicts: fs/smb/server/smbacl.c [Commit 38c8a9a52082 ("smb: move client and server files to common directory fs/smb") move smbacl.c to fs/smb/server/.] Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- fs/ksmbd/smbacl.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/fs/ksmbd/smbacl.c b/fs/ksmbd/smbacl.c index 3368a4e73773..44485451a6f0 100644 --- a/fs/ksmbd/smbacl.c +++ b/fs/ksmbd/smbacl.c @@ -582,6 +582,7 @@ static void set_posix_acl_entries_dacl(struct smb_ace *pndace, struct smb_sid *sid; struct smb_ace *ntace; int i, j; + u16 ace_sz; if (!fattr->cf_acls) goto posix_default_acl; @@ -626,8 +627,10 @@ static void set_posix_acl_entries_dacl(struct smb_ace *pndace, flags = 0x03; ntace = (struct smb_ace *)((char *)pndace + *size); - *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags, + ace_sz = fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, flags, pace->e_perm, 0777); + if (check_add_overflow(*size, ace_sz, size)) + break; (*num_aces)++; if (pace->e_tag == ACL_USER) ntace->access_req |= @@ -636,8 +639,10 @@ static void set_posix_acl_entries_dacl(struct smb_ace *pndace, if (S_ISDIR(fattr->cf_mode) && (pace->e_tag == ACL_USER || pace->e_tag == ACL_GROUP)) { ntace = (struct smb_ace *)((char *)pndace + *size); - *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, + ace_sz = fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x03, pace->e_perm, 0777); + if (check_add_overflow(*size, ace_sz, size)) + break; (*num_aces)++; if (pace->e_tag == ACL_USER) ntace->access_req |= @@ -677,8 +682,10 @@ static void set_posix_acl_entries_dacl(struct smb_ace *pndace, } ntace = (struct smb_ace *)((char *)pndace + *size); - *size += fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b, + ace_sz = fill_ace_for_sid(ntace, sid, ACCESS_ALLOWED, 0x0b, pace->e_perm, 0777); + if (check_add_overflow(*size, ace_sz, size)) + break; (*num_aces)++; if (pace->e_tag == ACL_USER) ntace->access_req |= @@ -712,7 +719,8 @@ static void set_ntacl_dacl(struct smb_acl *pndacl, struct smb_acl *nt_dacl, break; memcpy((char *)pndace + size, ntace, nt_ace_size); - size += nt_ace_size; + if (check_add_overflow(size, nt_ace_size, &size)) + break; aces_size -= nt_ace_size; ntace = (struct smb_ace *)((char *)ntace + nt_ace_size); num_aces++; -- 2.52.0

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[PATCH OLK-6.6] smb: client: prevent races in ->query_interfaces()
by Li Lingfeng 14 May '26

14 May '26

From: Henrique Carvalho <henrique.carvalho(a)suse.com> stable inclusion from stable-v6.6.128 commit 93e8e3ee165ae4609a1222b516b573837103d2c3 category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/8792 CVE: CVE-2026-43239 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit c3c06e42e1527716c54f3ad2ced6a034b5f3a489 ] It was possible for two query interface works to be concurrently trying to update the interfaces. Prevent this by checking and updating iface_last_update under iface_lock. Signed-off-by: Henrique Carvalho <henrique.carvalho(a)suse.com> Signed-off-by: Steve French <stfrench(a)microsoft.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Li Lingfeng <lilingfeng3(a)huawei.com> --- fs/smb/client/smb2ops.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 40eea0b2f48b..a051f205589a 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -595,13 +595,6 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, p = buf; spin_lock(&ses->iface_lock); - /* do not query too frequently, this time with lock held */ - if (ses->iface_last_update && - time_before(jiffies, ses->iface_last_update + - (SMB_INTERFACE_POLL_INTERVAL * HZ))) { - spin_unlock(&ses->iface_lock); - return 0; - } /* * Go through iface_list and mark them as inactive @@ -624,7 +617,6 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, "Empty network interface list returned by server %s\n", ses->server->hostname); rc = -EOPNOTSUPP; - ses->iface_last_update = jiffies; goto out; } @@ -753,8 +745,6 @@ parse_server_interfaces(struct network_interface_info_ioctl_rsp *buf, + sizeof(p->Next) && p->Next)) cifs_dbg(VFS, "%s: incomplete interface info\n", __func__); - ses->iface_last_update = jiffies; - out: /* * Go through the list again and put the inactive entries @@ -783,10 +773,17 @@ SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon, bool in_ struct TCP_Server_Info *pserver; /* do not query too frequently */ + spin_lock(&ses->iface_lock); if (ses->iface_last_update && time_before(jiffies, ses->iface_last_update + - (SMB_INTERFACE_POLL_INTERVAL * HZ))) + (SMB_INTERFACE_POLL_INTERVAL * HZ))) { + spin_unlock(&ses->iface_lock); return 0; + } + + ses->iface_last_update = jiffies; + + spin_unlock(&ses->iface_lock); rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID, FSCTL_QUERY_NETWORK_INTERFACE_INFO, -- 2.52.0

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