tree: https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git keys-acl head: 06a67e452fb9c5815f6181878949ab31178c6d67 commit: eed986d8643280beed60cf7e7b9599f768706a53 [23/24] keys: Split the search perms between KEY_NEED_USE and KEY_NEED_SEARCH config: powerpc64-randconfig-r016-20210209 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c9439ca36342fb6013187d0a69aef92736951476) 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 # install powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/com... git remote add dhowells-fs https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git git fetch --no-tags dhowells-fs keys-acl git checkout eed986d8643280beed60cf7e7b9599f768706a53 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:102:1: note: expanded from here __do_insw ^ arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw' #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/crypto/keyring.c:26: In file included from fs/crypto/fscrypt_private.h:17: In file included from include/linux/blk-crypto.h:72: In file included from include/linux/blkdev.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:47:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:104:1: note: expanded from here __do_insl ^ arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl' #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/crypto/keyring.c:26: In file included from fs/crypto/fscrypt_private.h:17: In file included from include/linux/blk-crypto.h:72: In file included from include/linux/blkdev.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:49:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:106:1: note: expanded from here __do_outsb ^ arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb' #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/crypto/keyring.c:26: In file included from fs/crypto/fscrypt_private.h:17: In file included from include/linux/blk-crypto.h:72: In file included from include/linux/blkdev.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:51:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:108:1: note: expanded from here __do_outsw ^ arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw' #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ In file included from fs/crypto/keyring.c:26: In file included from fs/crypto/fscrypt_private.h:17: In file included from include/linux/blk-crypto.h:72: In file included from include/linux/blkdev.h:14: In file included from include/linux/pagemap.h:11: In file included from include/linux/highmem.h:10: In file included from include/linux/hardirq.h:10: In file included from arch/powerpc/include/asm/hardirq.h:6: In file included from include/linux/irq.h:20: In file included from include/linux/io.h:13: In file included from arch/powerpc/include/asm/io.h:619: arch/powerpc/include/asm/io-defs.h:53:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic] DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c), ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET' __do_##name al; \ ^~~~~~~~~~~~~~ <scratch space>:110:1: note: expanded from here __do_outsl ^ arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl' #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n)) ~~~~~~~~~~~~~~~~~~~~~^ keyref = keyring_search(keyref, type, description, false); ~~~~~~~~~~~~~~ ^ include/linux/key.h:434:18: note: 'keyring_search' declared here extern key_ref_t keyring_search(key_ref_t keyring, ^ 12 warnings and 1 error generated. 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; 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