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Date:   Wed, 29 Apr 2020 15:45:03 +0100
From:   Quentin Monnet <>
To:     Alexei Starovoitov <>,
        Daniel Borkmann <>
        Quentin Monnet <>,
        Richard Palethorpe <>,
        Michael Kerrisk <>
Subject: [PATCH bpf-next v3 0/3] tools: bpftool: probe features for unprivileged users

This set allows unprivileged users to probe available features with
bpftool. On Daniel's suggestion, the "unprivileged" keyword must be passed
on the command line to avoid accidentally dumping a subset of the features
supported by the system. When used by root, this keyword makes bpftool drop
the CAP_SYS_ADMIN capability and print the features available to
unprivileged users only.

The first patch makes a variable global in feature.c to avoid piping too
many booleans through the different functions. The second patch introduces
the unprivileged probing, adding a dependency to libcap. Then the third
patch makes this dependency optional, by restoring the initial behaviour
(root only can probe features) if the library is not available.

Cc: Richard Palethorpe <>
Cc: Michael Kerrisk <>

v3: Update help message for bpftool feature probe ("unprivileged").

v2: Add "unprivileged" keyword, libcap check (patches 1 and 3 are new).

Quentin Monnet (3):
  tools: bpftool: for "feature probe" define "full_mode" bool as global
  tools: bpftool: allow unprivileged users to probe features
  tools: bpftool: make libcap dependency optional

 .../bpftool/Documentation/bpftool-feature.rst |  12 +-
 tools/bpf/bpftool/Makefile                    |  13 +-
 tools/bpf/bpftool/bash-completion/bpftool     |   2 +-
 tools/bpf/bpftool/feature.c                   | 143 +++++++++++++++---
 4 files changed, 143 insertions(+), 27 deletions(-)


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