[linux-next:master 12693/13311] lib/crypto/blake2s-generic.c:40:6: warning: stack frame size of 4288 bytes in function 'blake2s_compress_generic'

* [linux-next:master 12693/13311] lib/crypto/blake2s-generic.c:40:6: warning: stack frame size of 4288 bytes in function 'blake2s_compress_generic'
@ 2020-12-15 22:01 ` kernel test robot
  0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2020-12-15 22:01 UTC (permalink / raw)
  To: Kees Cook
  Cc: kbuild-all, clang-built-linux, Linux Memory Management List,
	Andrew Morton

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   9317f948b0b188b8d2fded75957e6d42c460df1b
commit: bd06731ef42b0b0fb321a06c182ffd83029f69f5 [12693/13311] ubsan: enable for all*config builds
config: powerpc-randconfig-r006-20201216 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project a29ecca7819a6ed4250d3689b12b1f664bb790d7)
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 powerpc cross compiling tool for clang build
        # apt-get install binutils-powerpc-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=bd06731ef42b0b0fb321a06c182ffd83029f69f5
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout bd06731ef42b0b0fb321a06c182ffd83029f69f5
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc 

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

All warnings (new ones prefixed by >>):

>> lib/crypto/blake2s-generic.c:40:6: warning: stack frame size of 4288 bytes in function 'blake2s_compress_generic' [-Wframe-larger-than=]
   void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
        ^
   1 warning generated.

vim +/blake2s_compress_generic +40 lib/crypto/blake2s-generic.c

66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  39  
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08 @40  void blake2s_compress_generic(struct blake2s_state *state,const u8 *block,
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  41  			      size_t nblocks, const u32 inc)
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  42  {
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  43  	u32 m[16];
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  44  	u32 v[16];
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  45  	int i;
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  46  
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  47  	WARN_ON(IS_ENABLED(DEBUG) &&
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  48  		(nblocks > 1 && inc != BLAKE2S_BLOCK_SIZE));
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  49  
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  50  	while (nblocks > 0) {
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  51  		blake2s_increment_counter(state, inc);
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  52  		memcpy(m, block, BLAKE2S_BLOCK_SIZE);
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  53  		le32_to_cpu_array(m, ARRAY_SIZE(m));
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  54  		memcpy(v, state->h, 32);
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  55  		v[ 8] = BLAKE2S_IV0;
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  56  		v[ 9] = BLAKE2S_IV1;
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  57  		v[10] = BLAKE2S_IV2;
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  58  		v[11] = BLAKE2S_IV3;
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  59  		v[12] = BLAKE2S_IV4 ^ state->t[0];
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  60  		v[13] = BLAKE2S_IV5 ^ state->t[1];
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  61  		v[14] = BLAKE2S_IV6 ^ state->f[0];
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  62  		v[15] = BLAKE2S_IV7 ^ state->f[1];
66d7fb94e4ffe5a Jason A. Donenfeld 2019-11-08  63  

:::::: The code at line 40 was first introduced by commit
:::::: 66d7fb94e4ffe5acc589e0b2b4710aecc1f07a28 crypto: blake2s - generic C library implementation and selftest

:::::: TO: Jason A. Donenfeld <Jason@zx2c4.com>
:::::: CC: Herbert Xu <herbert@gondor.apana.org.au>

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

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