[PATCH] kernel: Expose SYS_kcmp by default

[kernel test robot]

Hi Chris,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linux/master]
[also build test ERROR on kees/for-next/seccomp kees/for-next/pstore linus/master v5.11-rc6 next-20210125]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Chris-Wilson/kernel-Expose-SYS_kcmp-by-default/20210206-004006
base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2ab38c17aac10bf55ab3efde4c4db3893d8691d2
config: i386-randconfig-s002-20210205 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-215-g0fb77bb6-dirty
        # https://github.com/0day-ci/linux/commit/f7694e48ae81aac5a226e74421dbda1dcdc3ca92
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Chris-Wilson/kernel-Expose-SYS_kcmp-by-default/20210206-004006
        git checkout f7694e48ae81aac5a226e74421dbda1dcdc3ca92
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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

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

   kernel/kcmp.c: In function 'kcmp_epoll_target':
>> kernel/kcmp.c:117:13: error: implicit declaration of function 'get_epoll_tfile_raw_ptr'; did you mean 'get_file_raw_ptr'? [-Werror=implicit-function-declaration]
     117 |  filp_tgt = get_epoll_tfile_raw_ptr(filp_epoll, slot.tfd, slot.toff);
         |             ^~~~~~~~~~~~~~~~~~~~~~~
         |             get_file_raw_ptr
>> kernel/kcmp.c:117:11: warning: assignment to 'struct file *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
     117 |  filp_tgt = get_epoll_tfile_raw_ptr(filp_epoll, slot.tfd, slot.toff);
         |           ^
   cc1: some warnings being treated as errors


vim +117 kernel/kcmp.c

d97b46a64674a2 Cyrill Gorcunov   2012-05-31   96  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12   97  #ifdef CONFIG_EPOLL
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12   98  static int kcmp_epoll_target(struct task_struct *task1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12   99  			     struct task_struct *task2,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  100  			     unsigned long idx1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  101  			     struct kcmp_epoll_slot __user *uslot)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  102  {
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  103  	struct file *filp, *filp_epoll, *filp_tgt;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  104  	struct kcmp_epoll_slot slot;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  105  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  106  	if (copy_from_user(&slot, uslot, sizeof(slot)))
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  107  		return -EFAULT;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  108  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  109  	filp = get_file_raw_ptr(task1, idx1);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  110  	if (!filp)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  111  		return -EBADF;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  112  
f43c283a89a7dc Eric W. Biederman 2020-11-20  113  	filp_epoll = fget_task(task2, slot.efd);
f43c283a89a7dc Eric W. Biederman 2020-11-20  114  	if (!filp_epoll)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  115  		return -EBADF;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  116  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12 @117  	filp_tgt = get_epoll_tfile_raw_ptr(filp_epoll, slot.tfd, slot.toff);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  118  	fput(filp_epoll);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  119  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  120  	if (IS_ERR(filp_tgt))
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  121  		return PTR_ERR(filp_tgt);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  122  
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  123  	return kcmp_ptr(filp, filp_tgt, KCMP_FILE);
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  124  }
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  125  #else
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  126  static int kcmp_epoll_target(struct task_struct *task1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  127  			     struct task_struct *task2,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  128  			     unsigned long idx1,
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  129  			     struct kcmp_epoll_slot __user *uslot)
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  130  {
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  131  	return -EOPNOTSUPP;
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  132  }
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  133  #endif
0791e3644e5ef2 Cyrill Gorcunov   2017-07-12  134  

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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