linux-kernel - Re: [PATCH 04/17] perf data: Fail check

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Date:   Thu, 21 Feb 2019 14:23:30 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
Subject: Re: [PATCH 04/17] perf data: Fail check_backup in case of error

On Thu, Feb 21, 2019 at 10:41:32AM +0100, Jiri Olsa wrote:
> And display the error message from removing
> the old data file:
> 
>   $ perf record ls
>   Can't remove old data: Permission denied (perf.data.old)
>   Perf session creation failed.
> 
> Not sure how to make fail the rename (after we successfully
> remove the destination file/dir) to show the message,
> anyway let's have it there.

The use of rm_rf is really scary. So I simple command line typo could turn
this into rm -rf / ? 

Please add some sanity checks to not remove multiple levels,
and only remove files which look like they are generated
by perf.

-Andi