netdev - Re: [PATCH v3 bpf-next 2/3] bpf: implement CAP

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Date:   Sat, 7 Sep 2019 00:20:22 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Alexei Starovoitov <ast@...nel.org>
Cc:     kbuild-all@...org, davem@...emloft.net, daniel@...earbox.net,
        peterz@...radead.org, luto@...capital.net, netdev@...r.kernel.org,
        bpf@...r.kernel.org, kernel-team@...com, linux-api@...r.kernel.org
Subject: Re: [PATCH v3 bpf-next 2/3] bpf: implement CAP_BPF

Hi Alexei,

I love your patch! Perhaps something to improve:

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

url:    https://github.com/0day-ci/linux/commits/Alexei-Starovoitov/capability-introduce-CAP_BPF-and-CAP_TRACING/20190906-215814
base:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-11) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   kernel//bpf/syscall.c: In function 'bpf_prog_test_run':
>> kernel//bpf/syscall.c:2087:6: warning: the address of 'capable_bpf_net_admin' will always evaluate as 'true' [-Waddress]
     if (!capable_bpf_net_admin)
         ^

vim +2087 kernel//bpf/syscall.c

  2080	
  2081	static int bpf_prog_test_run(const union bpf_attr *attr,
  2082				     union bpf_attr __user *uattr)
  2083	{
  2084		struct bpf_prog *prog;
  2085		int ret = -ENOTSUPP;
  2086	
> 2087		if (!capable_bpf_net_admin)
  2088			/* test_run callback is available for networking progs only.
  2089			 * Add capable_bpf_tracing() above when tracing progs become runable.
  2090			 */
  2091			return -EPERM;
  2092		if (CHECK_ATTR(BPF_PROG_TEST_RUN))
  2093			return -EINVAL;
  2094	
  2095		if ((attr->test.ctx_size_in && !attr->test.ctx_in) ||
  2096		    (!attr->test.ctx_size_in && attr->test.ctx_in))
  2097			return -EINVAL;
  2098	
  2099		if ((attr->test.ctx_size_out && !attr->test.ctx_out) ||
  2100		    (!attr->test.ctx_size_out && attr->test.ctx_out))
  2101			return -EINVAL;
  2102	
  2103		prog = bpf_prog_get(attr->test.prog_fd);
  2104		if (IS_ERR(prog))
  2105			return PTR_ERR(prog);
  2106	
  2107		if (prog->aux->ops->test_run)
  2108			ret = prog->aux->ops->test_run(prog, attr, uattr);
  2109	
  2110		bpf_prog_put(prog);
  2111		return ret;
  2112	}
  2113	

---
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