On Mon, Mar 10, 2025 at 11:12:07AM -0700, Kees Cook wrote:
> On Mon, Mar 10, 2025 at 10:54:12AM +0800, kernel test robot wrote:
> > Hi Kees,
> >
> > kernel test robot noticed the following build warnings:
> >
> > [auto build test WARNING on kees/for-next/hardening]
> > [also build test WARNING on masahiroy-kbuild/for-next
> > masahiroy-kbuild/fixes kees/for-next/pstore linus/master v6.14-rc6
> > next-20250307]
> > [cannot apply to kees/for-next/kspp]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use '--base' as documented in
> > https://git-scm.com/docs/git-format-patch#_base_tree_information]
> >
> > url:
> > https://github.com/intel-lab-lkp/linux/commits/Kees-Cook/ubsan-overflow-Rework-integer-overflow-sanitizer-option-to-turn-on-everything/20250307-122130
> > base: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git
> > for-next/hardening
> > patch link:
> > https://lore.kernel.org/r/20250307041914.937329-1-kees%40kernel.org
> > patch subject: [PATCH 1/3] ubsan/overflow: Rework integer overflow
> > sanitizer option to turn on everything
> > config: s390-randconfig-r112-20250310
> > (https://download.01.org/0day-ci/archive/20250310/[email protected]/config)
> > compiler: s390-linux-gcc (GCC) 14.2.0
> > reproduce:
> > (https://download.01.org/0day-ci/archive/20250310/[email protected]/reproduce)
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new
> > version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <[email protected]>
> > | Closes:
> > https://lore.kernel.org/oe-kbuild-all/[email protected]/
> >
> > sparse warnings: (new ones prefixed by >>)
> > >> lib/test_ubsan.c:62:16: sparse: sparse: cast truncates bits from
> > >> constant value (7fffffffffffffff becomes ffffffff)
> > lib/test_ubsan.c:72:18: sparse: sparse: shift count is negative (-1)
>
> Can we exclude certain source files from sparse? This whole file is
> basically an endless series of intentionally bad operations. :)
Thanks Kees, got it, I will update the bot to handle this to exclude
this file firstly from sparse.
>
> -Kees
>
> >
> > vim +62 lib/test_ubsan.c
> >
> > 55
> > 56 static void test_ubsan_truncate_signed(void)
> > 57 {
> > 58 volatile long val = LONG_MAX;
> > 59 volatile int val2 = 0;
> > 60
> > 61 UBSAN_TEST(CONFIG_UBSAN_INTEGER_WRAP);
> > > 62 val2 = val;
> > 63 }
> > 64
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
>
> --
> Kees Cook
>
