[PATCH 2/2] selinux: use netlink_receive hook

[kbuild test robot]

Hi Jeff,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc5 next-20190822]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Jeff-Vander-Stoep/rtnetlink-gate-MAC-address-with-an-LSM-hook/20190823-071253
config: i386-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/sched.h:12:0,
                    from include/linux/tracehook.h:46,
                    from security/selinux/hooks.c:27:
   security/selinux/hooks.c: In function 'selinux_netlink_receive':
>> arch/x86/include/asm/current.h:18:17: error: passing argument 1 of 'sock_has_perm' from incompatible pointer type [-Werror=incompatible-pointer-types]
    #define current get_current()
                    ^
>> security/selinux/hooks.c:5830:23: note: in expansion of macro 'current'
     return sock_has_perm(current, sk, NETLINK_ROUTE_SOCKET__NLMSG_READPRIV);
                          ^~~~~~~
   security/selinux/hooks.c:4422:12: note: expected 'struct sock *' but argument is of type 'struct task_struct *'
    static int sock_has_perm(struct sock *sk, u32 perms)
               ^~~~~~~~~~~~~
>> security/selinux/hooks.c:5830:32: warning: passing argument 2 of 'sock_has_perm' makes integer from pointer without a cast [-Wint-conversion]
     return sock_has_perm(current, sk, NETLINK_ROUTE_SOCKET__NLMSG_READPRIV);
                                   ^~
   security/selinux/hooks.c:4422:12: note: expected 'u32 {aka unsigned int}' but argument is of type 'struct sock *'
    static int sock_has_perm(struct sock *sk, u32 perms)
               ^~~~~~~~~~~~~
>> security/selinux/hooks.c:5830:9: error: too many arguments to function 'sock_has_perm'
     return sock_has_perm(current, sk, NETLINK_ROUTE_SOCKET__NLMSG_READPRIV);
            ^~~~~~~~~~~~~
   security/selinux/hooks.c:4422:12: note: declared here
    static int sock_has_perm(struct sock *sk, u32 perms)
               ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/sock_has_perm +18 arch/x86/include/asm/current.h

f0766440dda7ac include/asm-x86/current.h      Christoph Lameter 2008-05-09  17  
c6f5e0acd5d12e arch/x86/include/asm/current.h Brian Gerst       2009-01-19 @18  #define current get_current()
f0766440dda7ac include/asm-x86/current.h      Christoph Lameter 2008-05-09  19  

:::::: The code at line 18 was first introduced by commit
:::::: c6f5e0acd5d12ee23f701f15889872e67b47caa6 x86-64: Move current task from PDA to per-cpu and consolidate with 32-bit.

:::::: TO: Brian Gerst <brgerst at gmail.com>
:::::: CC: Tejun Heo <tj at kernel.org>

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