linux-kernel - [PATCH v4 00/10] Move uid filtering to BPF filters

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Message-ID: <20250604174545.2853620-1-irogers@google.com>
Date: Wed,  4 Jun 2025 10:45:34 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
	Dapeng Mi <dapeng1.mi@...ux.intel.com>, Thomas Richter <tmricht@...ux.ibm.com>, 
	Veronika Molnarova <vmolnaro@...hat.com>, Chun-Tse Shao <ctshao@...gle.com>, Leo Yan <leo.yan@....com>, 
	Hao Ge <gehao@...inos.cn>, Howard Chu <howardchu95@...il.com>, 
	Weilin Wang <weilin.wang@...el.com>, Levi Yun <yeoreum.yun@....com>, 
	"Dr. David Alan Gilbert" <linux@...blig.org>, Gautam Menghani <gautam@...ux.ibm.com>, 
	Tengda Wu <wutengda@...weicloud.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH v4 00/10] Move uid filtering to BPF filters

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. The
/proc scanning also misses processes starting after the perf
command. Add a helper for commands that support UID filtering and wire
up. Remove the non-BPF UID filtering support given it doesn't work.

v4: Add a warning message on top of Namhyung's BPF filter error message:
https://lore.kernel.org/lkml/20250604054234.23608-1-namhyung@kernel.org/
    in the parse_uid_filter helper. In TUI the warning is shown then
    the BPF error shown, with stdio the warning appears below the BPF
    errors.

v3: Add lengthier commit messages as requested by Arnaldo. Rebase on
    tmp.perf-tools-next.

v2: Add a perf record uid test (Namhyung) and force setting
    system-wide for perf trace and perf record (Namhyung). Ensure the
    uid filter isn't set on tracepoint evsels.

v1: https://lore.kernel.org/lkml/20250111190143.1029906-1-irogers@google.com/

Ian Rogers (10):
  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 tests record: Add basic uid filtering test
  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        | 36 ++++++++------
 tools/perf/builtin-ftrace.c                 |  1 -
 tools/perf/builtin-kvm.c                    |  2 -
 tools/perf/builtin-record.c                 | 27 ++++++-----
 tools/perf/builtin-stat.c                   |  4 +-
 tools/perf/builtin-top.c                    | 22 +++++----
 tools/perf/builtin-trace.c                  | 27 +++++++----
 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/shell/record.sh            | 26 ++++++++++
 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              | 47 +++++++++++++-----
 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 +
 31 files changed, 164 insertions(+), 182 deletions(-)

-- 
2.50.0.rc0.604.gd4ff7b7c86-goog