linux-kernel - Re: [PATCH v1 00/10] Move uid filtering to BPF filters

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <Z6panMzNSm1op8Di@google.com>
Date: Mon, 10 Feb 2025 11:59:24 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>, Hao Ge <gehao@...inos.cn>,
	James Clark <james.clark@...aro.org>,
	Howard Chu <howardchu95@...il.com>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Levi Yun <yeoreum.yun@....com>, Xu Yang <xu.yang_2@....com>,
	Tengda Wu <wutengda@...weicloud.com>,
	Yang Jihong <yangjihong1@...wei.com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 00/10] Move uid filtering to BPF filters

On Sat, Jan 11, 2025 at 11:01:33AM -0800, Ian Rogers wrote:
> Rather than scanning /proc and skipping PIDs based on their UIDs, use
> BPF filters for uid filtering. The /proc scanning in thread_map is
> racy as the PID may exit before the perf_event_open causing perf to
> abort. BPF UID filters are more robust as they avoid the race. Add a
> helper for commands that support UID filtering and wire up. Remove the
> non-BPF UID filtering support.

Hmm.. then non-BPF build cannot use the UID filtering anymore, right?
Also non-root users will be limited unless it pinned the BPF program in
advance.

I think you can keep the original behavior and convert to BPF only when
it's available.

Thanks,
Namhyung

> 
> Ian Rogers (10):
>   perf bench evlist-open-close: Reduce scope of 2 variables
>   perf parse-events filter: Use evsel__find_pmu
>   perf target: Separate parse_uid into its own function
>   perf parse-events: Add parse_uid_filter helper
>   perf record: Switch user option to use BPF filter
>   perf top: Switch user option to use BPF filter
>   perf trace: Switch user option to use BPF filter
>   perf bench evlist-open-close: Switch user option to use BPF filter
>   perf target: Remove uid from target
>   perf thread_map: Remove uid options
> 
>  tools/perf/bench/evlist-open-close.c        | 76 ++++++++++++---------
>  tools/perf/builtin-ftrace.c                 |  1 -
>  tools/perf/builtin-kvm.c                    |  2 -
>  tools/perf/builtin-record.c                 | 26 +++----
>  tools/perf/builtin-stat.c                   |  4 +-
>  tools/perf/builtin-top.c                    | 22 +++---
>  tools/perf/builtin-trace.c                  | 25 ++++---
>  tools/perf/tests/backward-ring-buffer.c     |  1 -
>  tools/perf/tests/event-times.c              |  8 +--
>  tools/perf/tests/keep-tracking.c            |  2 +-
>  tools/perf/tests/mmap-basic.c               |  2 +-
>  tools/perf/tests/openat-syscall-all-cpus.c  |  2 +-
>  tools/perf/tests/openat-syscall-tp-fields.c |  1 -
>  tools/perf/tests/openat-syscall.c           |  2 +-
>  tools/perf/tests/perf-record.c              |  1 -
>  tools/perf/tests/perf-time-to-tsc.c         |  2 +-
>  tools/perf/tests/switch-tracking.c          |  2 +-
>  tools/perf/tests/task-exit.c                |  1 -
>  tools/perf/tests/thread-map.c               |  2 +-
>  tools/perf/util/bpf-filter.c                |  2 +-
>  tools/perf/util/evlist.c                    |  3 +-
>  tools/perf/util/parse-events.c              | 25 ++++---
>  tools/perf/util/parse-events.h              |  1 +
>  tools/perf/util/python.c                    | 10 +--
>  tools/perf/util/target.c                    | 54 ++-------------
>  tools/perf/util/target.h                    | 15 +---
>  tools/perf/util/thread_map.c                | 32 +--------
>  tools/perf/util/thread_map.h                |  6 +-
>  tools/perf/util/top.c                       |  4 +-
>  tools/perf/util/top.h                       |  1 +
>  30 files changed, 135 insertions(+), 200 deletions(-)
> 
> -- 
> 2.47.1.613.gc27f4b7a9f-goog
>