linux-kernel - Re: [PATCH v1] perf: extend message to mention CAP_SYS

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Date:   Thu, 6 Aug 2020 09:14:55 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] perf: extend message to mention CAP_SYS_PTRACE and
 perf security doc link

Em Wed, Aug 05, 2020 at 10:31:20AM +0300, Alexey Budankov escreveu:
> 
> Adjust limited access message to mention CAP_SYS_PTRACE capability
> for processes of unprivileged users. Add link to perf security
> document in the end of the section about capabilities.
> The change has been inspired by this discussion:
> https://lore.kernel.org/lkml/20200722113007.GI77866@kernel.org/

Thanks, applied.

- Arnaldo
 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
>  tools/perf/util/evsel.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 9aa51a65593d..e241ee773ccb 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -2500,8 +2500,10 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target,
>  
>  		return scnprintf(msg + printed, size - printed,
>  		 "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n"
> -		 "access to performance monitoring and observability operations for users\n"
> -		 "without CAP_PERFMON or CAP_SYS_ADMIN Linux capability.\n"
> +		 "access to performance monitoring and observability operations for processes\n"
> +		 "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n"
> +		 "More information can be found at 'Perf events and tool security' document:\n"
> +		 "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n"
>  		 "perf_event_paranoid setting is %d:\n"
>  		 "  -1: Allow use of (almost) all events by all users\n"
>  		 "      Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n"
> -- 
> 2.24.1

-- 

- Arnaldo