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[PATCH OLK-6.6 v2] perf/aux: Fix pending disable flow when the AUX ring buffer overruns
by Pu Lehui 01 Sep '25

01 Sep '25

From: Leo Yan <leo.yan(a)arm.com> mainline inclusion from mainline-v6.16-rc4 commit 1476b218327b89bbb64c14619a2d34f0c320f2c3 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/ICVQU8 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- If an AUX event overruns, the event core layer intends to disable the event by setting the 'pending_disable' flag. Unfortunately, the event is not actually disabled afterwards. In commit: ca6c21327c6a ("perf: Fix missing SIGTRAPs") the 'pending_disable' flag was changed to a boolean. However, the AUX event code was not updated accordingly. The flag ends up holding a CPU number. If this number is zero, the flag is taken as false and the IRQ work is never triggered. Later, with commit: 2b84def990d3 ("perf: Split __perf_pending_irq() out of perf_pending_irq()") a new IRQ work 'pending_disable_irq' was introduced to handle event disabling. The AUX event path was not updated to kick off the work queue. To fix this bug, when an AUX ring buffer overrun is detected, call perf_event_disable_inatomic() to initiate the pending disable flow. Also update the outdated comment for setting the flag, to reflect the boolean values (0 or 1). Fixes: 2b84def990d3 ("perf: Split __perf_pending_irq() out of perf_pending_irq()") Fixes: ca6c21327c6a ("perf: Fix missing SIGTRAPs") Signed-off-by: Leo Yan <leo.yan(a)arm.com> Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Reviewed-by: James Clark <james.clark(a)linaro.org> Reviewed-by: Yeoreum Yun <yeoreum.yun(a)arm.com> Cc: Adrian Hunter <adrian.hunter(a)intel.com> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme(a)kernel.org> Cc: Ian Rogers <irogers(a)google.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Liang Kan <kan.liang(a)linux.intel.com> Cc: Marco Elver <elver(a)google.com> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> Cc: linux-perf-users(a)vger.kernel.org Link: https://lore.kernel.org/r/20250625170737.2918295-1-leo.yan@arm.com Signed-off-by: Pu Lehui <pulehui(a)huawei.com> --- kernel/events/core.c | 6 +++--- kernel/events/ring_buffer.c | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 1ee8084e343d..ec89dc39ae16 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6807,15 +6807,15 @@ static void __perf_pending_irq(struct perf_event *event) * CPU-A CPU-B * * perf_event_disable_inatomic() - * @pending_disable = CPU-A; + * @pending_disable = 1; * irq_work_queue(); * * sched-out - * @pending_disable = -1; + * @pending_disable = 0; * * sched-in * perf_event_disable_inatomic() - * @pending_disable = CPU-B; + * @pending_disable = 1; * irq_work_queue(); // FAILS * * irq_work_run() diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index cfd9448ce28f..610e9b22f0c4 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -437,7 +437,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle, * store that will be enabled on successful return */ if (!handle->size) { /* A, matches D */ - event->pending_disable = smp_processor_id(); + perf_event_disable_inatomic(handle->event); perf_output_wakeup(handle); WRITE_ONCE(rb->aux_nest, 0); goto err_put; @@ -522,7 +522,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) if (wakeup) { if (handle->aux_flags & PERF_AUX_FLAG_TRUNCATED) - handle->event->pending_disable = smp_processor_id(); + perf_event_disable_inatomic(handle->event); perf_output_wakeup(handle); } -- 2.34.1

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[PATCH OLK-6.6] cpufreq: scpi: Fix null-ptr-deref in scpi_cpufreq_get_rate()
by Lin Yujun 01 Sep '25

01 Sep '25

From: Henry Martin <bsdhenrymartin(a)gmail.com> stable inclusion from stable-v6.6.89 commit 19e0eaa62e8831f2bc0285fef3bf8faaa7f3e09b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IC6BI0 CVE: CVE-2025-37829 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 73b24dc731731edf762f9454552cb3a5b7224949 ] cpufreq_cpu_get_raw() can return NULL when the target CPU is not present in the policy->cpus mask. scpi_cpufreq_get_rate() does not check for this case, which results in a NULL pointer dereference. Fixes: 343a8d17fa8d ("cpufreq: scpi: remove arm_big_little dependency") Signed-off-by: Henry Martin <bsdhenrymartin(a)gmail.com> Acked-by: Sudeep Holla <sudeep.holla(a)arm.com> Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Lin Yujun <linyujun809(a)h-partners.com> --- drivers/cpufreq/scpi-cpufreq.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/cpufreq/scpi-cpufreq.c b/drivers/cpufreq/scpi-cpufreq.c index d33be56983ed..e7abab7ebde9 100644 --- a/drivers/cpufreq/scpi-cpufreq.c +++ b/drivers/cpufreq/scpi-cpufreq.c @@ -29,9 +29,16 @@ static struct scpi_ops *scpi_ops; static unsigned int scpi_cpufreq_get_rate(unsigned int cpu) { - struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); - struct scpi_data *priv = policy->driver_data; - unsigned long rate = clk_get_rate(priv->clk); + struct cpufreq_policy *policy; + struct scpi_data *priv; + unsigned long rate; + + policy = cpufreq_cpu_get_raw(cpu); + if (unlikely(!policy)) + return 0; + + priv = policy->driver_data; + rate = clk_get_rate(priv->clk); return rate / 1000; } -- 2.34.1

2 1

[openeuler:openEuler-1.0-LTS 1343/1343] fs/ext4/mballoc.o: warning: objtool: ext4_mb_complex_scan_group()+0x11a4: unreachable instruction
by kernel test robot 01 Sep '25

01 Sep '25

Hi Theodore, First bad commit (maybe != root cause): tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 7dd09dff93e7ad921baf5cec4b58301d9aebb79a commit: 41298197ead9e85ee2ec1d52122f03fd1863cff2 [1343/1343] ext4: convert BUG_ON's to WARN_ON's in mballoc.c config: x86_64-randconfig-101-20241223 (https://download.01.org/0day-ci/archive/20250901/202509011339.wShfHPCs-lkp@…) compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250901/202509011339.wShfHPCs-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509011339.wShfHPCs-lkp@intel.com/ All warnings (new ones prefixed by >>): fs/ext4/mballoc.c:4734: warning: Function parameter or member 'bh' not described in 'ext4_free_blocks' >> fs/ext4/mballoc.o: warning: objtool: ext4_mb_complex_scan_group()+0x11a4: unreachable instruction -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

1 0

[openeuler:openEuler-1.0-LTS 1353/1353] fs/debugfs/file.o: warning: objtool: full_proxy_open()+0x55a: unreachable instruction
by kernel test robot 01 Sep '25

01 Sep '25

Hi Drew, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 7dd09dff93e7ad921baf5cec4b58301d9aebb79a commit: d4bdc26bcd632cee393b5171345d5fa6293fe42b [1353/1353] include/asm-generic/bug.h: fix "cut here" for WARN_ON for __WARN_TAINT architectures config: x86_64-randconfig-122-20241226 (https://download.01.org/0day-ci/archive/20250901/202509011343.tLFbbMN4-lkp@…) compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250901/202509011343.tLFbbMN4-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509011343.tLFbbMN4-lkp@intel.com/ All warnings (new ones prefixed by >>): fs/debugfs/file.c: note: in included file (through include/linux/kernel.h, include/linux/list.h, include/linux/module.h): /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:44: sparse: sparse: Expected ) in function call /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:44: sparse: sparse: got < /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:43: sparse: sparse: not a function <noident> /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:22: sparse: sparse: bad constant expression type fs/debugfs/file.c: note: in included file (through include/linux/printk.h, include/linux/kernel.h, include/linux/list.h, ...): /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:44: sparse: sparse: Expected ) in function call /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:44: sparse: sparse: got < /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:43: sparse: sparse: not a function <noident> /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:22: sparse: sparse: bad constant expression type fs/debugfs/file.c: note: in included file (through include/linux/string.h, include/linux/bitmap.h, include/linux/cpumask.h, ...): /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:44: sparse: sparse: Expected ) in function call /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:44: sparse: sparse: got < /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:43: sparse: sparse: not a function <noident> /opt/cross/clang-cd708029e0/lib/clang/19/include/stdarg.h:22:22: sparse: sparse: bad constant expression type >> fs/debugfs/file.o: warning: objtool: full_proxy_open()+0x55a: unreachable instruction -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

1 0

[openeuler:openEuler-1.0-LTS 1327/1327] mm/vmscan.c:3257:21: error: implicit declaration of function 'kernel_swap_enabled'
by kernel test robot 01 Sep '25

01 Sep '25

Hi liubo, FYI, the error/warning still remains. tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 7dd09dff93e7ad921baf5cec4b58301d9aebb79a commit: 44983705e56ab22fda801d66e2a6bd0d1be7ca0b [1327/1327] etmem: add original kernel swap enabled options config: x86_64-buildonly-randconfig-005-20241216 (https://download.01.org/0day-ci/archive/20250901/202509011244.xk0lo5DG-lkp@…) compiler: clang version 19.1.3 (https://github.com/llvm/llvm-project ab51eccf88f5321e7c60591c5546b254b6afab99) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250901/202509011244.xk0lo5DG-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202509011244.xk0lo5DG-lkp@intel.com/ All errors (new ones prefixed by >>): mm/vmscan.c:2734:17: warning: variable 'node_lru_pages' set but not used [-Wunused-but-set-variable] 2734 | unsigned long node_lru_pages = 0; | ^ >> mm/vmscan.c:3257:21: error: implicit declaration of function 'kernel_swap_enabled' [-Werror,-Wimplicit-function-declaration] 3257 | if (sc != NULL && !kernel_swap_enabled()) | ^ mm/vmscan.c:3257:21: note: did you mean 'kernfs_ns_enabled'? include/linux/kernfs.h:309:20: note: 'kernfs_ns_enabled' declared here 309 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) | ^ 1 warning and 1 error generated. vim +/kernel_swap_enabled +3257 mm/vmscan.c 3250 3251 /* 3252 * Check if original kernel swap is enabled 3253 * turn off kernel swap,but leave page cache reclaim on 3254 */ 3255 static inline void kernel_swap_check(struct scan_control *sc) 3256 { > 3257 if (sc != NULL && !kernel_swap_enabled()) 3258 sc->may_swap = 0; 3259 } 3260 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

1 0

[PATCH OLK-6.6] sdei_watchdog: add percpu flag to fix sdei watchdog state in lpi mode
by Bowen You 01 Sep '25

01 Sep '25

From: youbowen <youbowen2(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC CVE: NA ------------------------------------------------- /proc/sys/kernel/nmi_watchdog interface is designed to close nmi watchdog, but currently, it's not working when in low power scenario, since pm callback will enable/disable event when power state changes. This commit add a percpu flag to be compatible with pm callback. Fixes: f022c4cac9c1 ("sdei_watchdog: use lockup_detector_retry_init() to init sdei watchdog") Signed-off-by: Bowen You <youbowen2(a)huawei.com> --- arch/arm64/kernel/watchdog_sdei.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/watchdog_sdei.c b/arch/arm64/kernel/watchdog_sdei.c index 19f47e24fa59..87d97aace5b3 100644 --- a/arch/arm64/kernel/watchdog_sdei.c +++ b/arch/arm64/kernel/watchdog_sdei.c @@ -25,6 +25,7 @@ static int sdei_watchdog_event_num; bool disable_sdei_nmi_watchdog; static bool sdei_watchdog_registered; static DEFINE_PER_CPU(ktime_t, last_check_time); +static DEFINE_PER_CPU(bool, sdei_usr_en); void sdei_watchdog_hardlockup_enable(unsigned int cpu) { @@ -44,6 +45,7 @@ void sdei_watchdog_hardlockup_enable(unsigned int cpu) pr_err("Enable NMI Watchdog failed on cpu%d\n", smp_processor_id()); } + __this_cpu_write(sdei_usr_en, 1); } void sdei_watchdog_hardlockup_disable(unsigned int cpu) @@ -54,6 +56,7 @@ void sdei_watchdog_hardlockup_disable(unsigned int cpu) return; ret = sdei_api_event_disable(sdei_watchdog_event_num); + __this_cpu_write(sdei_usr_en, 0); if (ret) pr_err("Disable NMI Watchdog failed on cpu%d\n", smp_processor_id()); @@ -116,10 +119,12 @@ static int sdei_watchdog_pm_notifier(struct notifier_block *nb, switch (action) { case CPU_PM_ENTER: - rv = sdei_api_event_disable(sdei_watchdog_event_num); + if (per_cpu(sdei_usr_en, smp_processor_id())) + rv = sdei_api_event_disable(sdei_watchdog_event_num); break; case CPU_PM_EXIT: - rv = sdei_api_event_enable(sdei_watchdog_event_num); + if (per_cpu(sdei_usr_en, smp_processor_id())) + rv = sdei_api_event_enable(sdei_watchdog_event_num); break; default: return NOTIFY_DONE; -- 2.34.1

2 1

[PATCH OLK-6.6] sdei_watchdog: add percpu flag to fix sdei watchdog state in lpi mode
by Bowen You 01 Sep '25

01 Sep '25

From: youbowen <youbowen2(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC CVE: NA ------------------------------------------------- /proc/sys/kernel/nmi_watchdog interface is designed to close nmi watchdog, but currently, it's not working when in low power scenario, since pm callback will enable/disable event when power state changes. This commit add a percpu flag to be compatible with pm callback. Fixes: f022c4cac9c1 ("sdei_watchdog: use lockup_detector_retry_init() to init sdei watchdog") Signed-off-by: Bowen You <youbowen2(a)huawei.com> --- arch/arm64/kernel/watchdog_sdei.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/watchdog_sdei.c b/arch/arm64/kernel/watchdog_sdei.c index 19f47e24fa59..da1d80743996 100644 --- a/arch/arm64/kernel/watchdog_sdei.c +++ b/arch/arm64/kernel/watchdog_sdei.c @@ -25,6 +25,7 @@ static int sdei_watchdog_event_num; bool disable_sdei_nmi_watchdog; static bool sdei_watchdog_registered; static DEFINE_PER_CPU(ktime_t, last_check_time); +static DEFINE_PER_CPU(bool, sdei_usr_en); void sdei_watchdog_hardlockup_enable(unsigned int cpu) { @@ -44,6 +45,7 @@ void sdei_watchdog_hardlockup_enable(unsigned int cpu) pr_err("Enable NMI Watchdog failed on cpu%d\n", smp_processor_id()); } + __this_cpu_write(sdei_usr_en, 1); } void sdei_watchdog_hardlockup_disable(unsigned int cpu) @@ -54,6 +56,7 @@ void sdei_watchdog_hardlockup_disable(unsigned int cpu) return; ret = sdei_api_event_disable(sdei_watchdog_event_num); + __this_cpu_write(sdei_usr_en, 0); if (ret) pr_err("Disable NMI Watchdog failed on cpu%d\n", smp_processor_id()); @@ -62,6 +65,7 @@ void sdei_watchdog_hardlockup_disable(unsigned int cpu) static int sdei_watchdog_callback(u32 event, struct pt_regs *regs, void *arg) { + pr_err("sdei watchdog callback on cpu %d\n", smp_processor_id()); ktime_t delta, now = ktime_get_mono_fast_ns(); delta = now - __this_cpu_read(last_check_time); @@ -116,10 +120,12 @@ static int sdei_watchdog_pm_notifier(struct notifier_block *nb, switch (action) { case CPU_PM_ENTER: - rv = sdei_api_event_disable(sdei_watchdog_event_num); + if (per_cpu(sdei_usr_en, smp_processor_id())) + rv = sdei_api_event_disable(sdei_watchdog_event_num); break; case CPU_PM_EXIT: - rv = sdei_api_event_enable(sdei_watchdog_event_num); + if (per_cpu(sdei_usr_en, smp_processor_id())) + rv = sdei_api_event_enable(sdei_watchdog_event_num); break; default: return NOTIFY_DONE; -- 2.34.1

2 1

[PATCH OLK-6.6] perf/aux: Fix pending disable flow when the AUX ring buffer overruns
by Pu Lehui 01 Sep '25

01 Sep '25

From: Leo Yan <leo.yan(a)arm.com> mainline inclusion from mainline-v6.16-rc4 commit 1476b218327b89bbb64c14619a2d34f0c320f2c3 category: bugfix bugzilla: 190743 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- If an AUX event overruns, the event core layer intends to disable the event by setting the 'pending_disable' flag. Unfortunately, the event is not actually disabled afterwards. In commit: ca6c21327c6a ("perf: Fix missing SIGTRAPs") the 'pending_disable' flag was changed to a boolean. However, the AUX event code was not updated accordingly. The flag ends up holding a CPU number. If this number is zero, the flag is taken as false and the IRQ work is never triggered. Later, with commit: 2b84def990d3 ("perf: Split __perf_pending_irq() out of perf_pending_irq()") a new IRQ work 'pending_disable_irq' was introduced to handle event disabling. The AUX event path was not updated to kick off the work queue. To fix this bug, when an AUX ring buffer overrun is detected, call perf_event_disable_inatomic() to initiate the pending disable flow. Also update the outdated comment for setting the flag, to reflect the boolean values (0 or 1). Fixes: 2b84def990d3 ("perf: Split __perf_pending_irq() out of perf_pending_irq()") Fixes: ca6c21327c6a ("perf: Fix missing SIGTRAPs") Signed-off-by: Leo Yan <leo.yan(a)arm.com> Signed-off-by: Ingo Molnar <mingo(a)kernel.org> Reviewed-by: James Clark <james.clark(a)linaro.org> Reviewed-by: Yeoreum Yun <yeoreum.yun(a)arm.com> Cc: Adrian Hunter <adrian.hunter(a)intel.com> Cc: Alexander Shishkin <alexander.shishkin(a)linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme(a)kernel.org> Cc: Ian Rogers <irogers(a)google.com> Cc: Jiri Olsa <jolsa(a)redhat.com> Cc: Liang Kan <kan.liang(a)linux.intel.com> Cc: Marco Elver <elver(a)google.com> Cc: Mark Rutland <mark.rutland(a)arm.com> Cc: Namhyung Kim <namhyung(a)kernel.org> Cc: Peter Zijlstra <peterz(a)infradead.org> Cc: Sebastian Andrzej Siewior <bigeasy(a)linutronix.de> Cc: linux-perf-users(a)vger.kernel.org Link: https://lore.kernel.org/r/20250625170737.2918295-1-leo.yan@arm.com Signed-off-by: Pu Lehui <pulehui(a)huawei.com> --- kernel/events/core.c | 6 +++--- kernel/events/ring_buffer.c | 4 ++-- 2 files changed, 5 insertions(+), 5 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 1ee8084e343d..ec89dc39ae16 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -6807,15 +6807,15 @@ static void __perf_pending_irq(struct perf_event *event) * CPU-A CPU-B * * perf_event_disable_inatomic() - * @pending_disable = CPU-A; + * @pending_disable = 1; * irq_work_queue(); * * sched-out - * @pending_disable = -1; + * @pending_disable = 0; * * sched-in * perf_event_disable_inatomic() - * @pending_disable = CPU-B; + * @pending_disable = 1; * irq_work_queue(); // FAILS * * irq_work_run() diff --git a/kernel/events/ring_buffer.c b/kernel/events/ring_buffer.c index cfd9448ce28f..610e9b22f0c4 100644 --- a/kernel/events/ring_buffer.c +++ b/kernel/events/ring_buffer.c @@ -437,7 +437,7 @@ void *perf_aux_output_begin(struct perf_output_handle *handle, * store that will be enabled on successful return */ if (!handle->size) { /* A, matches D */ - event->pending_disable = smp_processor_id(); + perf_event_disable_inatomic(handle->event); perf_output_wakeup(handle); WRITE_ONCE(rb->aux_nest, 0); goto err_put; @@ -522,7 +522,7 @@ void perf_aux_output_end(struct perf_output_handle *handle, unsigned long size) if (wakeup) { if (handle->aux_flags & PERF_AUX_FLAG_TRUNCATED) - handle->event->pending_disable = smp_processor_id(); + perf_event_disable_inatomic(handle->event); perf_output_wakeup(handle); } -- 2.34.1

2 1

[PATCH OLK-6.6] sdei_watchdog: add percpu flag to fix sdei watchdog state in lpi mode
by Bowen You 01 Sep '25

01 Sep '25

From: youbowen <youbowen2(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LQCC CVE: NA ------------------------------------------------- /proc/sys/kernel/nmi_watchdog interface is designed to close nmi watchdog, but currently, it's not working when in low power scenario, since pm callback will enable/disable event when power state changes. This commit add a percpu flag to be compatible with pm callback. Signed-off-by: Bowen You <youbowen2(a)huawei.com> --- arch/arm64/kernel/watchdog_sdei.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/watchdog_sdei.c b/arch/arm64/kernel/watchdog_sdei.c index 19f47e24fa59..da1d80743996 100644 --- a/arch/arm64/kernel/watchdog_sdei.c +++ b/arch/arm64/kernel/watchdog_sdei.c @@ -25,6 +25,7 @@ static int sdei_watchdog_event_num; bool disable_sdei_nmi_watchdog; static bool sdei_watchdog_registered; static DEFINE_PER_CPU(ktime_t, last_check_time); +static DEFINE_PER_CPU(bool, sdei_usr_en); void sdei_watchdog_hardlockup_enable(unsigned int cpu) { @@ -44,6 +45,7 @@ void sdei_watchdog_hardlockup_enable(unsigned int cpu) pr_err("Enable NMI Watchdog failed on cpu%d\n", smp_processor_id()); } + __this_cpu_write(sdei_usr_en, 1); } void sdei_watchdog_hardlockup_disable(unsigned int cpu) @@ -54,6 +56,7 @@ void sdei_watchdog_hardlockup_disable(unsigned int cpu) return; ret = sdei_api_event_disable(sdei_watchdog_event_num); + __this_cpu_write(sdei_usr_en, 0); if (ret) pr_err("Disable NMI Watchdog failed on cpu%d\n", smp_processor_id()); @@ -62,6 +65,7 @@ void sdei_watchdog_hardlockup_disable(unsigned int cpu) static int sdei_watchdog_callback(u32 event, struct pt_regs *regs, void *arg) { + pr_err("sdei watchdog callback on cpu %d\n", smp_processor_id()); ktime_t delta, now = ktime_get_mono_fast_ns(); delta = now - __this_cpu_read(last_check_time); @@ -116,10 +120,12 @@ static int sdei_watchdog_pm_notifier(struct notifier_block *nb, switch (action) { case CPU_PM_ENTER: - rv = sdei_api_event_disable(sdei_watchdog_event_num); + if (per_cpu(sdei_usr_en, smp_processor_id())) + rv = sdei_api_event_disable(sdei_watchdog_event_num); break; case CPU_PM_EXIT: - rv = sdei_api_event_enable(sdei_watchdog_event_num); + if (per_cpu(sdei_usr_en, smp_processor_id())) + rv = sdei_api_event_enable(sdei_watchdog_event_num); break; default: return NOTIFY_DONE; -- 2.34.1

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[PATCH openEuler-1.0-LTS] ipv6: reject malicious packets in ipv6_gso_segment()
by Wang Liang 01 Sep '25

01 Sep '25

From: Eric Dumazet <edumazet(a)google.com> mainline inclusion from mainline-v6.17-rc1 commit d45cf1e7d7180256e17c9ce88e32e8061a7887fe category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/ICU6G7 CVE: CVE-2025-38572 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- syzbot was able to craft a packet with very long IPv6 extension headers leading to an overflow of skb->transport_header. This 16bit field has a limited range. Add skb_reset_transport_header_careful() helper and use it from ipv6_gso_segment() WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 skb_reset_transport_header include/linux/skbuff.h:3032 [inline] WARNING: CPU: 0 PID: 5871 at ./include/linux/skbuff.h:3032 ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151 Modules linked in: CPU: 0 UID: 0 PID: 5871 Comm: syz-executor211 Not tainted 6.16.0-rc6-syzkaller-g7abc678e3084 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:skb_reset_transport_header include/linux/skbuff.h:3032 [inline] RIP: 0010:ipv6_gso_segment+0x15e2/0x21e0 net/ipv6/ip6_offload.c:151 Call Trace: <TASK> skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53 nsh_gso_segment+0x54a/0xe10 net/nsh/nsh.c:110 skb_mac_gso_segment+0x31c/0x640 net/core/gso.c:53 __skb_gso_segment+0x342/0x510 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0x857/0x11b0 net/core/dev.c:3950 validate_xmit_skb_list+0x84/0x120 net/core/dev.c:4000 sch_direct_xmit+0xd3/0x4b0 net/sched/sch_generic.c:329 __dev_xmit_skb net/core/dev.c:4102 [inline] __dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4679 Fixes: d1da932ed4ec ("ipv6: Separate ipv6 offload support") Reported-by: syzbot+af43e647fd835acc02df(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/netdev/688a1a05.050a0220.5d226.0008.GAE@google.com/… Signed-off-by: Eric Dumazet <edumazet(a)google.com> Reviewed-by: Dawid Osuchowski <dawid.osuchowski(a)linux.intel.com> Reviewed-by: Willem de Bruijn <willemb(a)google.com> Link: https://patch.msgid.link/20250730131738.3385939-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Wang Liang <wangliang74(a)huawei.com> --- include/linux/skbuff.h | 23 +++++++++++++++++++++++ net/ipv6/ip6_offload.c | 4 +++- 2 files changed, 26 insertions(+), 1 deletion(-) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index c7d1d8b5f41b..2e2d504c7902 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2374,6 +2374,29 @@ static inline void skb_reset_transport_header(struct sk_buff *skb) skb->transport_header = skb->data - skb->head; } +/** + * skb_reset_transport_header_careful - conditionally reset transport header + * @skb: buffer to alter + * + * Hardened version of skb_reset_transport_header(). + * + * Returns: true if the operation was a success. + */ +static inline bool __must_check +skb_reset_transport_header_careful(struct sk_buff *skb) +{ + long offset = skb->data - skb->head; + + if (unlikely(offset != (typeof(skb->transport_header))offset)) + return false; + + if (unlikely(offset == (typeof(skb->transport_header))~0U)) + return false; + + skb->transport_header = offset; + return true; +} + static inline void skb_set_transport_header(struct sk_buff *skb, const int offset) { diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index 6c47cd0ef240..81227ca2a883 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -96,7 +96,9 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb, ops = rcu_dereference(inet6_offloads[proto]); if (likely(ops && ops->callbacks.gso_segment)) { - skb_reset_transport_header(skb); + if (!skb_reset_transport_header_careful(skb)) + goto out; + segs = ops->callbacks.gso_segment(skb, features); if (!segs) skb->network_header = skb_mac_header(skb) + nhoff - skb->head; -- 2.34.1

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