tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: d47175169c28eedd2cc2ab8c01f38764cb0269cc commit: c1e6784607ec548d505ff2dab0312141a20d04ed [13878/13946] fs/namespace: untag user pointers in copy_mount_options config: sparc64-allmodconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout c1e6784607ec548d505ff2dab0312141a20d04ed # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=sparc64 If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp@xxxxxxxxx> All error/warnings (new ones prefixed by >>): fs/namespace.c: In function 'copy_mount_options': >> fs/namespace.c:3031:55: error: expected ')' before ';' token size = TASK_SIZE - (unsigned long)untagged_addr(data); ^ >> fs/namespace.c:3043:1: error: expected ';' before '}' token } ^ fs/namespace.c:3015:6: warning: unused variable 'i' [-Wunused-variable] int i; ^ >> fs/namespace.c:3043:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ At top level: fs/namespace.c:2991:13: warning: 'exact_copy_from_user' defined but not used [-Wunused-function] static long exact_copy_from_user(void *to, const void __user * from, ^~~~~~~~~~~~~~~~~~~~ vim +3031 fs/namespace.c 3012 3013 void *copy_mount_options(const void __user * data) 3014 { 3015 int i; 3016 unsigned long size; 3017 char *copy; 3018 3019 if (!data) 3020 return NULL; 3021 3022 copy = kmalloc(PAGE_SIZE, GFP_KERNEL); 3023 if (!copy) 3024 return ERR_PTR(-ENOMEM); 3025 3026 /* We only care that *some* data at the address the user 3027 * gave us is valid. Just in case, we'll zero 3028 * the remainder of the page. 3029 */ 3030 /* copy_from_user cannot cross TASK_SIZE ! */ > 3031 size = TASK_SIZE - (unsigned long)untagged_addr(data); 3032 if (size > PAGE_SIZE) 3033 size = PAGE_SIZE; 3034 3035 i = size - exact_copy_from_user(copy, data, size); 3036 if (!i) { 3037 kfree(copy); 3038 return ERR_PTR(-EFAULT); 3039 } 3040 if (i != PAGE_SIZE) 3041 memset(copy + i, 0, PAGE_SIZE - i); 3042 return copy; > 3043 } 3044 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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