mbox series

[bpf-next,v2,0/3] tools: bpftool: probe features for unprivileged users

Message ID 20200429130534.11823-1-quentin@isovalent.com
Headers show
Series tools: bpftool: probe features for unprivileged users | expand

Message

Quentin Monnet April 29, 2020, 1:05 p.m. UTC 
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 <rpalethorpe@suse.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>

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                   | 141 +++++++++++++++---
 4 files changed, 142 insertions(+), 26 deletions(-)