linux-kernel - Re: [PATCH] perf session: Fix handling when buffer exceeds 2 GiB

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Message-ID: <aMry3oh_qaV0ZI03@x1>
Date: Wed, 17 Sep 2025 14:41:50 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Leo Yan <leo.yan@....com>, Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Tamas Zsoldos <tamas.zsoldos@....com>
Subject: Re: [PATCH] perf session: Fix handling when buffer exceeds 2 GiB

On Fri, Aug 15, 2025 at 01:17:29PM -0700, Namhyung Kim wrote:
> On Fri, Aug 08, 2025 at 02:24:40PM +0100, Leo Yan wrote:
> > If a user specifies an AUX buffer larger than 2 GiB, the returned size
> > may exceed 0x80000000. Since the err variable is defined as a signed
> > 32-bit integer, such a value overflows and becomes negative.
> > 
> > As a result, the perf record command reports an error:
> > 
> >   0x146e8 [0x30]: failed to process type: 71 [Unknown error 183711232]
> > 
> > Change the type of the err variable to a signed 64-bit integer to
> > accommodate large buffer sizes correctly.
> > 
> > Reported-by: Tamas Zsoldos <tamas.zsoldos@....com>
> > Fixes: d5652d865ea7 ("perf session: Add ability to skip 4GiB or more")
> > Signed-off-by: Leo Yan <leo.yan@....com>
> 
> Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks, applied to perf-tools-next,

- Arnaldo