[v3] Enable perf tracing for unprivileged users

[PATCH v3 0/3] Enable perf tracing for unprivileged users

Anubhav Shelat posted 3 patches 1 month, 3 weeks ago

Diff against v4
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fs/tracefs/inode.c              |  2 +-
kernel/events/core.c            | 23 ++++++++++++++++++++---
kernel/trace/trace_event_perf.c | 12 +++++++++++-
kernel/trace/trace_events.c     |  8 ++++++--
tools/perf/util/evsel.c         |  4 +++-
5 files changed, 41 insertions(+), 8 deletions(-)

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[PATCH v3 0/3] Enable perf tracing for unprivileged users

Posted by Anubhav Shelat 1 month, 3 weeks ago

Enable users to use perf-trace to trace their own processes, like strace
but without the overhead of ptrace(). Ensure that users cannot access
other users' or systemwide tracing data.

Changes in v3:
- Don't set PERF_SAMPLE_IP for unprivileged tracepoints. This allows us
  to exclude PERF_SAMPLE_IP from kaddr_leak without weakening KASLR.
- Mount tracefs as world-traversable so users can access eventfs
  directories.

v2: https://lore.kernel.org/lkml/20260410133529.21947-1-ashelat@redhat.com/

Anubhav Shelat (3):
  perf evsel: don't set PERF_SAMPLE_IP for unprivileged tracepoints
  perf: enable unprivileged syscall tracing with perf trace
  tracefs: make root directory world-traversable

 fs/tracefs/inode.c              |  2 +-
 kernel/events/core.c            | 23 ++++++++++++++++++++---
 kernel/trace/trace_event_perf.c | 12 +++++++++++-
 kernel/trace/trace_events.c     |  8 ++++++--
 tools/perf/util/evsel.c         |  4 +++-
 5 files changed, 41 insertions(+), 8 deletions(-)

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2.53.0