Re: [PATCH bpf-next 03/10] bpf: Support bpf_dynptr-typed map key for bpf syscall

[kernel test robot <lkp@intel.com>]

Hi Hou,

Thank you for the patch! Yet something to improve:

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

url:    https://github.com/intel-lab-lkp/linux/commits/Hou-Tao/Add-support-for-qp-trie-map/20220917-231450
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: arm-randconfig-r002-20220917 (https://download.01.org/0day-ci/archive/20220918/202209180207.PvS9ya46-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/1995ae6874ef9089b4eee12c00ba9c5af264b8bc
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Hou-Tao/Add-support-for-qp-trie-map/20220917-231450
        git checkout 1995ae6874ef9089b4eee12c00ba9c5af264b8bc
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: kernel/bpf/syscall.o: in function `bpf_copy_to_dynptr_ukey':
>> kernel/bpf/syscall.c:1368: undefined reference to `__get_user_bad'
   pahole: .tmp_vmlinux.btf: No such file or directory
   .btf.vmlinux.bin.o: file not recognized: file format not recognized


vim +1368 kernel/bpf/syscall.c

  1361	
  1362	static int bpf_copy_to_dynptr_ukey(struct bpf_dynptr_user __user *uptr,
  1363					   struct bpf_dynptr_kern *kptr)
  1364	{
  1365		unsigned int size;
  1366		u64 udata;
  1367	
> 1368		if (get_user(udata, &uptr->data))
  1369			return -EFAULT;
  1370	
  1371		/* Also zeroing the reserved field in uptr */
  1372		size = bpf_dynptr_get_size(kptr);
  1373		if (copy_to_user(u64_to_user_ptr(udata), kptr->data + kptr->offset, size) ||
  1374		    put_user(size, &uptr->size) || put_user(0, &uptr->size + 1))
  1375			return -EFAULT;
  1376	
  1377		return 0;
  1378	}
  1379	

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp