tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git keys-acl head: 2a3c3edfc979691a7dc4733da827f508da90995a commit: d1aa67ba9c4d53ddb95f6b5ec73968287df65fb4 [4/5] keys: Split the search perms between KEY_NEED_USE and KEY_NEED_SEARCH config: arc-randconfig-s032-20200716 (attached as .config) compiler: arc-elf-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.2-49-g707c5017-dirty git checkout d1aa67ba9c4d53ddb95f6b5ec73968287df65fb4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) vim +145 fs/crypto/keyring.c 23c688b54016ee Eric Biggers 2019-08-04 133 23c688b54016ee Eric Biggers 2019-08-04 134 /* Search ->s_master_keys or ->mk_users */ 22d94f493bfb40 Eric Biggers 2019-08-04 135 static struct key *search_fscrypt_keyring(struct key *keyring, 22d94f493bfb40 Eric Biggers 2019-08-04 136 struct key_type *type, 22d94f493bfb40 Eric Biggers 2019-08-04 137 const char *description) 22d94f493bfb40 Eric Biggers 2019-08-04 138 { 22d94f493bfb40 Eric Biggers 2019-08-04 139 /* 22d94f493bfb40 Eric Biggers 2019-08-04 140 * We need to mark the keyring reference as "possessed" so that we 22d94f493bfb40 Eric Biggers 2019-08-04 141 * acquire permission to search it, via the KEY_POS_SEARCH permission. 22d94f493bfb40 Eric Biggers 2019-08-04 142 */ 22d94f493bfb40 Eric Biggers 2019-08-04 143 key_ref_t keyref = make_key_ref(keyring, true /* possessed */); 22d94f493bfb40 Eric Biggers 2019-08-04 144 22d94f493bfb40 Eric Biggers 2019-08-04 @145 keyref = keyring_search(keyref, type, description, false); 22d94f493bfb40 Eric Biggers 2019-08-04 146 if (IS_ERR(keyref)) { 22d94f493bfb40 Eric Biggers 2019-08-04 147 if (PTR_ERR(keyref) == -EAGAIN || /* not found */ 22d94f493bfb40 Eric Biggers 2019-08-04 148 PTR_ERR(keyref) == -EKEYREVOKED) /* recently invalidated */ 22d94f493bfb40 Eric Biggers 2019-08-04 149 keyref = ERR_PTR(-ENOKEY); 22d94f493bfb40 Eric Biggers 2019-08-04 150 return ERR_CAST(keyref); 22d94f493bfb40 Eric Biggers 2019-08-04 151 } 22d94f493bfb40 Eric Biggers 2019-08-04 152 return key_ref_to_ptr(keyref); 22d94f493bfb40 Eric Biggers 2019-08-04 153 } 22d94f493bfb40 Eric Biggers 2019-08-04 154 :::::: The code at line 145 was first introduced by commit :::::: 22d94f493bfb408fdd764f7b1d0363af2122fba5 fscrypt: add FS_IOC_ADD_ENCRYPTION_KEY ioctl :::::: TO: Eric Biggers <ebiggers(a)google.com&gt; :::::: CC: Eric Biggers <ebiggers(a)google.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org