From: Thorsten Blum <thorsten.blum@linux.dev>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
"Liang, Kan" <kan.liang@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Kees Cook <kees@kernel.org>,
"Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Thorsten Blum <thorsten.blum@linux.dev>,
linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: [PATCH v2] perf/x86: Annotate struct bts_buffer with __counted_by()
Date: Wed, 5 Mar 2025 13:31:34 +0100 [thread overview]
Message-ID: <20250305123134.215577-2-thorsten.blum@linux.dev> (raw)
Add the __counted_by() compiler attribute to the flexible array member
buf to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.
No functional changes intended.
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
---
Changes in v2:
- struct_size() changes should be a separate patch as suggested by Ingo
- Link to v1: https://lore.kernel.org/r/20250304183056.78920-2-thorsten.blum@linux.dev/
---
arch/x86/events/intel/bts.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index 8f78b0c900ef..c7be60c0b94f 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -58,7 +58,7 @@ struct bts_buffer {
local_t head;
unsigned long end;
void **data_pages;
- struct bts_phys buf[];
+ struct bts_phys buf[] __counted_by(nr_bufs);
};
static struct pmu bts_pmu;
--
2.48.1
next reply other threads:[~2025-03-05 12:32 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-05 12:31 Thorsten Blum [this message]
2025-03-05 17:39 ` [tip: perf/core] perf/x86: Annotate struct bts_buffer::buf with __counted_by() tip-bot2 for Thorsten Blum
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