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Message-Id: <20231006201754.work.473-kees@kernel.org> Date: Fri, 6 Oct 2023 13:17:54 -0700 From: Kees Cook <keescook@...omium.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Kees Cook <keescook@...omium.org>, Ingo Molnar <mingo@...hat.com>, Arnaldo Carvalho de Melo <acme@...nel.org>, Mark Rutland <mark.rutland@....com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, linux-perf-users@...r.kernel.org, linux-hardening@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>, Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org, llvm@...ts.linux.dev Subject: [PATCH] perf/x86/rapl: Annotate struct rapl_pmus with __counted_by Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct rapl_pmus. Cc: Peter Zijlstra <peterz@...radead.org> Cc: Ingo Molnar <mingo@...hat.com> Cc: Arnaldo Carvalho de Melo <acme@...nel.org> Cc: Mark Rutland <mark.rutland@....com> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com> Cc: Jiri Olsa <jolsa@...nel.org> Cc: Namhyung Kim <namhyung@...nel.org> Cc: Ian Rogers <irogers@...gle.com> Cc: Adrian Hunter <adrian.hunter@...el.com> Cc: Thomas Gleixner <tglx@...utronix.de> Cc: Borislav Petkov <bp@...en8.de> Cc: Dave Hansen <dave.hansen@...ux.intel.com> Cc: x86@...nel.org Cc: "H. Peter Anvin" <hpa@...or.com> Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org> Cc: linux-perf-users@...r.kernel.org Cc: linux-hardening@...r.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keescook@...omium.org> --- arch/x86/events/rapl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c index c2c37fb0a228..8d98d468b976 100644 --- a/arch/x86/events/rapl.c +++ b/arch/x86/events/rapl.c @@ -115,7 +115,7 @@ struct rapl_pmu { struct rapl_pmus { struct pmu pmu; unsigned int maxdie; - struct rapl_pmu *pmus[]; + struct rapl_pmu *pmus[] __counted_by(maxdie); }; enum rapl_unit_quirk { -- 2.34.1
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