linux-kernel - Re: [PATCH] perf bperf: Avoid use after free via union

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Message-ID: <ZDVUO/bg8WwnL8V+@kernel.org>
Date:   Tue, 11 Apr 2023 09:36:11 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH] perf bperf: Avoid use after free via union

Em Mon, Apr 10, 2023 at 10:17:18PM -0700, Ian Rogers escreveu:
> If bperf sets leader_skel or follower_skel then it appears bpf_skel is
> set and can trigger the following use-after-free:

<SNIP>
 
> Resolve by clearing bpf_skel as part of bpf_counter__destroy.
 
> Suggested-by: Namhyung Kim <namhyung@...nel.org>

Thanks, applied.

- Arnaldo