netdev - Re: [PATCH v8 bpf-next 09/18] bpf,lsm: refactor bpf_prog_alloc/bpf_prog

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Date: Tue, 17 Oct 2023 21:56:01 +0800
From: kernel test robot <lkp@...el.com>
To: Andrii Nakryiko <andrii@...nel.org>, bpf@...r.kernel.org,
	netdev@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, linux-fsdevel@...r.kernel.org,
	linux-security-module@...r.kernel.org, keescook@...omium.org,
	brauner@...nel.org, lennart@...ttering.net, kernel-team@...a.com,
	sargun@...gun.me
Subject: Re: [PATCH v8 bpf-next 09/18] bpf,lsm: refactor
 bpf_prog_alloc/bpf_prog_free LSM hooks

Hi Andrii,

kernel test robot noticed the following build warnings:

[auto build test WARNING on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Andrii-Nakryiko/bpf-align-CAP_NET_ADMIN-checks-with-bpf_capable-approach/20231017-152928
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20231016180220.3866105-10-andrii%40kernel.org
patch subject: [PATCH v8 bpf-next 09/18] bpf,lsm: refactor bpf_prog_alloc/bpf_prog_free LSM hooks
config: m68k-allyesconfig (https://download.01.org/0day-ci/archive/20231017/202310172156.zcehiHbq-lkp@intel.com/config)
compiler: m68k-linux-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231017/202310172156.zcehiHbq-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310172156.zcehiHbq-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> security/security.c:5196: warning: Function parameter or member 'prog' not described in 'security_bpf_prog_load'


vim +5196 security/security.c

55e853201a9e03 Paul Moore      2023-02-16  5181  
55e853201a9e03 Paul Moore      2023-02-16  5182  /**
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5183   * security_bpf_prog_load() - Check if loading of BPF program is allowed
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5184   * @prog BPF program object
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5185   * @attr: BPF syscall attributes used to create BPF program
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5186   * @token: BPF token used to grant user access to BPF subsystem
55e853201a9e03 Paul Moore      2023-02-16  5187   *
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5188   * Do a check when the kernel allocates BPF program object and is about to
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5189   * pass it to BPF verifier for additional correctness checks. This is also the
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5190   * point where LSM blob is allocated for LSMs that need them.
55e853201a9e03 Paul Moore      2023-02-16  5191   *
55e853201a9e03 Paul Moore      2023-02-16  5192   * Return: Returns 0 on success, error on failure.
55e853201a9e03 Paul Moore      2023-02-16  5193   */
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5194  int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5195  			   struct bpf_token *token)
afdb09c720b62b Chenbo Feng     2017-10-18 @5196  {
82c20ee03a7a4e Andrii Nakryiko 2023-10-16  5197  	return call_int_hook(bpf_prog_load, 0, prog, attr, token);
afdb09c720b62b Chenbo Feng     2017-10-18  5198  }
55e853201a9e03 Paul Moore      2023-02-16  5199  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki