tree: https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git kunit head: c505c0b2e6237c729634327c178f5b0094f1c958 commit: b3c54f027d78b71240b2572cf2dabb3381aa68de [16/17] kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec() config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 8.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout b3c54f027d78b71240b2572cf2dabb3381aa68de # save the attached .config to linux build tree GCC_VERSION=8.1.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): kernel/sysctl-test.c: In function 'sysctl_test_dointvec_single_less_int_min': >> kernel/sysctl-test.c:185:37: warning: integer overflow in expression of type 'long int' results in '2147483647' [-Woverflow] long less_than_min = (long)INT_MIN - 1; ^ kernel/sysctl-test.c: In function 'sysctl_test_dointvec_single_greater_int_max': kernel/sysctl-test.c:213:40: warning: integer overflow in expression of type 'long int' results in '-2147483648' [-Woverflow] long greater_than_max = (long)INT_MAX + 1; ^ vim +185 kernel/sysctl-test.c 170 171 static void sysctl_test_dointvec_single_less_int_min(struct kunit *test) 172 { 173 struct ctl_table table = { 174 .procname = "foo", 175 .data = &test_data.int_0001, 176 .maxlen = sizeof(int), 177 .mode = 0644, 178 .proc_handler = proc_dointvec, 179 .extra1 = &i_zero, 180 .extra2 = &i_one_hundred, 181 }; 182 char input[32]; 183 size_t len = sizeof(input) - 1; 184 loff_t pos = 0; > 185 long less_than_min = (long)INT_MIN - 1; 186 187 KUNIT_EXPECT_LT(test, less_than_min, INT_MIN); 188 KUNIT_EXPECT_LT(test, 189 snprintf(input, sizeof(input), "%ld", less_than_min), 190 sizeof(input)); 191 192 table.data = kunit_kzalloc(test, sizeof(int), GFP_USER); 193 KUNIT_EXPECT_EQ(test, -EINVAL, 194 proc_dointvec(&table, 1, input, &len, &pos)); 195 KUNIT_EXPECT_EQ(test, sizeof(input) - 1, len); 196 KUNIT_EXPECT_EQ(test, 0, *(int *)table.data); 197 } 198 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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