[ebiggers:crypto-pending 3/7] crypto/xctr.c:66:22: sparse: sparse: restricted __le32 degrades to integer
From: kernel test robot
Date: Mon Feb 14 2022 - 22:43:35 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git crypto-pending
head: 67824d3cb5325de4264ad344174a7e4ea69e5303
commit: d98684f7dc5be61c6380f6c5a4d5dae44c6ddbca [3/7] crypto: hctr2 - Add HCTR2 support
config: arm-randconfig-s031-20220214 (https://download.01.org/0day-ci/archive/20220215/202202151139.J5pKremk-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
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: v0.6.4-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git/commit/?id=d98684f7dc5be61c6380f6c5a4d5dae44c6ddbca
git remote add ebiggers https://git.kernel.org/pub/scm/linux/kernel/git/ebiggers/linux.git
git fetch --no-tags ebiggers crypto-pending
git checkout d98684f7dc5be61c6380f6c5a4d5dae44c6ddbca
# save the config file to linux build tree
mkdir build_dir
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm SHELL=/bin/bash
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
sparse warnings: (new ones prefixed by >>)
>> crypto/xctr.c:66:22: sparse: sparse: restricted __le32 degrades to integer
crypto/xctr.c:94:22: sparse: sparse: restricted __le32 degrades to integer
vim +66 crypto/xctr.c
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 48
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 49 static int crypto_xctr_crypt_segment(struct skcipher_walk *walk,
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 50 struct crypto_cipher *tfm, u32 byte_ctr)
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 51 {
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 52 void (*fn)(struct crypto_tfm *, u8 *, const u8 *) =
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 53 crypto_cipher_alg(tfm)->cia_encrypt;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 54 u8 *src = walk->src.virt.addr;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 55 u8 *dst = walk->dst.virt.addr;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 56 unsigned int nbytes = walk->nbytes;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 57 __le32 ctr32 = cpu_to_le32(byte_ctr / XCTR_BLOCKSIZE + 1);
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 58
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 59 do {
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 60 /* create keystream */
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 61 crypto_xor(walk->iv, (u8 *)&ctr32, sizeof(ctr32));
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 62 fn(crypto_cipher_tfm(tfm), dst, walk->iv);
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 63 crypto_xor(dst, src, XCTR_BLOCKSIZE);
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 64 crypto_xor(walk->iv, (u8 *)&ctr32, sizeof(ctr32));
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 65
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 @66 ctr32++;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 67
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 68 src += XCTR_BLOCKSIZE;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 69 dst += XCTR_BLOCKSIZE;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 70 } while ((nbytes -= XCTR_BLOCKSIZE) >= XCTR_BLOCKSIZE);
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 71
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 72 return nbytes;
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 73 }
8330f8a6b750f6 Nathan Huckleberry 2022-02-10 74
:::::: The code at line 66 was first introduced by commit
:::::: 8330f8a6b750f6b7b65987a27d4bf7d2bebde570 crypto: xctr - Add XCTR support
:::::: TO: Nathan Huckleberry <nhuck@xxxxxxxxxx>
:::::: CC: Eric Biggers <ebiggers@xxxxxxxxxx>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx