linux-hardening - Re: [PATCH] perf/ring_buffer: Prefer struct

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Message-ID: <20240430091504.GC40213@noisy.programming.kicks-ass.net>
Date: Tue, 30 Apr 2024 11:15:04 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Erick Archer <erick.archer@...look.com>
Cc: Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Kees Cook <keescook@...omium.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Justin Stitt <justinstitt@...gle.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH] perf/ring_buffer: Prefer struct_size over open coded
 arithmetic

On Mon, Apr 29, 2024 at 07:40:58PM +0200, Erick Archer wrote:
> This is an effort to get rid of all multiplications from allocation
> functions in order to prevent integer overflows [1][2].

So personally I detest struct_size() because I can never remember wtf it
does, whereas the code it replaces is simple and straight forward :/