[PATCH v2 bpf-next 0/3] Fix and improvement for bpf_sysctl_set_new_value

[Raman Shukhau <ramasha@meta.com>]

Changes v1 => v2:
1. corrected copyright comments
2. unsigned int for sysctl name to prevent build test error:
   "R2 min value is negative, either use unsigned or 'var &= const'"

Fix and improvement for bpf_sysctl_set_new_value

This patch set is doing several changes around bpf_sysctl_set_new_value
(1 fix, 1 improvement, 1 test):
1. Fix is for return value check, when sysctl value is updated from BPF
  handler with call to bpf_sysctl_set_new_value.
2. Improvement for bpf_sysctl_set_new_value to match behavior with
  sysctl write call. Result value shouldn't include "\0", otherwise
  proc_sys_call_handler rejects value.
3. New cgrp_sysctl test suite is added. It has single test to check
  behavior of bpf_sysctl_set_new_value and is called from BPF
  test_progs test suite.

Raman Shukhau (3):
  net: Fix for bpf_sysctl_set_new_value
  net: Improvement for bpf_sysctl_set_new_value
  net: new cgrp_sysctl test suite

 kernel/bpf/cgroup.c                           |   7 +-
 .../selftests/bpf/prog_tests/cgrp_sysctl.c    | 103 ++++++++++++++++++
 .../testing/selftests/bpf/progs/cgrp_sysctl.c |  51 +++++++++
 3 files changed, 159 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/cgrp_sysctl.c
 create mode 100644 tools/testing/selftests/bpf/progs/cgrp_sysctl.c

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2.43.0