* [PATCH] perf/x86/intel: Annotate x86_pmu::hybrid_pmu with __counted_by_ptr
@ 2026-09-04 14:17 Thorsten Blum
2026-09-04 15:47 ` Ian Rogers
0 siblings, 1 reply; 2+ messages in thread
From: Thorsten Blum @ 2026-09-04 14:17 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Namhyung Kim, Mark Rutland, Alexander Shishkin, Jiri Olsa,
Ian Rogers, Adrian Hunter, James Clark, Thomas Gleixner,
Borislav Petkov, Dave Hansen, x86, H. Peter Anvin, Kees Cook,
Gustavo A. R. Silva
Cc: Thorsten Blum, linux-perf-users, linux-kernel, linux-hardening
Add __counted_by_ptr() to x86_pmu::hybrid_pmu to improve access bounds
checking via CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE.
Signed-off-by: Thorsten Blum <blum@kernel.org>
---
arch/x86/events/perf_event.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 71ed5b2acea2..b66691a4fc31 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -1050,7 +1050,7 @@ struct x86_pmu {
* unique capabilities.
*/
int num_hybrid_pmus;
- struct x86_hybrid_pmu *hybrid_pmu;
+ struct x86_hybrid_pmu *hybrid_pmu __counted_by_ptr(num_hybrid_pmus);
enum intel_cpu_type (*get_hybrid_cpu_type) (void);
};
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] perf/x86/intel: Annotate x86_pmu::hybrid_pmu with __counted_by_ptr
2026-09-04 14:17 [PATCH] perf/x86/intel: Annotate x86_pmu::hybrid_pmu with __counted_by_ptr Thorsten Blum
@ 2026-09-04 15:47 ` Ian Rogers
0 siblings, 0 replies; 2+ messages in thread
From: Ian Rogers @ 2026-09-04 15:47 UTC (permalink / raw)
To: Thorsten Blum, Dapeng Mi
Cc: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Namhyung Kim, Mark Rutland, Alexander Shishkin, Jiri Olsa,
Adrian Hunter, James Clark, Thomas Gleixner, Borislav Petkov,
Dave Hansen, x86, H. Peter Anvin, Kees Cook, Gustavo A. R. Silva,
linux-perf-users, linux-kernel, linux-hardening
On Fri, Sep 4, 2026 at 7:17 AM Thorsten Blum <blum@kernel.org> wrote:
>
> Add __counted_by_ptr() to x86_pmu::hybrid_pmu to improve access bounds
> checking via CONFIG_UBSAN_BOUNDS and CONFIG_FORTIFY_SOURCE.
>
> Signed-off-by: Thorsten Blum <blum@kernel.org>
> ---
> arch/x86/events/perf_event.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
> index 71ed5b2acea2..b66691a4fc31 100644
> --- a/arch/x86/events/perf_event.h
> +++ b/arch/x86/events/perf_event.h
> @@ -1050,7 +1050,7 @@ struct x86_pmu {
> * unique capabilities.
> */
> int num_hybrid_pmus;
> - struct x86_hybrid_pmu *hybrid_pmu;
> + struct x86_hybrid_pmu *hybrid_pmu __counted_by_ptr(num_hybrid_pmus);
Reviewed-by: Ian Rogers <irogers@google.com>
Thanks,
Ian
> enum intel_cpu_type (*get_hybrid_cpu_type) (void);
> };
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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