[kbuild-all] [arnd-playground:asm-generic-uaccess-4 1/7] arch/um/kernel/skas/uaccess.c:211:15: error: '__strncpy_from_user' undeclared here (not in a function); did you mean 'strncpy_from_user'?

Wednesday, 21 July 2021

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
asm-generic-uaccess-4
head:   d7d80410412f516869e09904cffd817acaeec742
commit: d6c30cddd046b12ea68ec67c50bac29cae3da28c [1/7] asm-generic/uaccess.h: remove
__strncpy_from_user/__strnlen_user
config: um-x86_64_defconfig (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce (this is a W=1 build):
        #
https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commi...
        git remote add arnd-playground
https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
        git fetch --no-tags arnd-playground asm-generic-uaccess-4
        git checkout d6c30cddd046b12ea68ec67c50bac29cae3da28c
        # save the attached .config to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=um SUBARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp(a)intel.com&gt;

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/linkage.h:7,
                    from include/linux/fs.h:5,
                    from include/linux/highmem.h:5,
                    from arch/um/kernel/skas/uaccess.c:7:
...
> arch/um/kernel/skas/uaccess.c:211:15: error:
'__strncpy_from_user' undeclared here (not in a function); did you mean
'strncpy_from_user'?      211 | EXPORT_SYMBOL(__strncpy_from_user);
         |               ^~~~~~~~~~~~~~~~~~~
   include/linux/export.h:98:16: note: in definition of macro '___EXPORT_SYMBOL'
      98 |  extern typeof(sym) sym;       \
         |                ^~~
   include/linux/export.h:160:34: note: in expansion of macro '__EXPORT_SYMBOL'
     160 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "")
         |                                  ^~~~~~~~~~~~~~~
   include/linux/export.h:163:29: note: in expansion of macro '_EXPORT_SYMBOL'
     163 | #define EXPORT_SYMBOL(sym)  _EXPORT_SYMBOL(sym, "")
         |                             ^~~~~~~~~~~~~~
   arch/um/kernel/skas/uaccess.c:211:1: note: in expansion of macro
'EXPORT_SYMBOL'
     211 | EXPORT_SYMBOL(__strncpy_from_user);
         | ^~~~~~~~~~~~~
...
> arch/um/kernel/skas/uaccess.c:242:6: warning: no previous
prototype for '__strnlen_user' [-Wmissing-prototypes]      242 | long
__strnlen_user(const void __user *str, long len)
         |      ^~~~~~~~~~~~~~

vim +211 arch/um/kernel/skas/uaccess.c

^1da177e4c3f41 Linus Torvalds     2005-04-16  191  
d6c30cddd046b1 Arnd Bergmann      2020-01-16  192  long strncpy_from_user(char *dst, const
char __user *src, long count)
^1da177e4c3f41 Linus Torvalds     2005-04-16  193  {
f8d65d27e677da Richard Weinberger 2015-05-12  194  	long n;
^1da177e4c3f41 Linus Torvalds     2005-04-16  195  	char *ptr = dst;
^1da177e4c3f41 Linus Torvalds     2005-04-16  196  
d6c30cddd046b1 Arnd Bergmann      2020-01-16  197  	if (!access_ok(src, 1))
d6c30cddd046b1 Arnd Bergmann      2020-01-16  198  		return -EFAULT;
d6c30cddd046b1 Arnd Bergmann      2020-01-16  199  
db68ce10c4f0a2 Al Viro            2017-03-20  200  	if (uaccess_kernel()) {
^1da177e4c3f41 Linus Torvalds     2005-04-16  201  		strncpy(dst, (__force void *) src,
count);
8ca842c4b5cbc7 Jeff Dike          2007-10-16  202  		return strnlen(dst, count);
^1da177e4c3f41 Linus Torvalds     2005-04-16  203  	}
^1da177e4c3f41 Linus Torvalds     2005-04-16  204  
^1da177e4c3f41 Linus Torvalds     2005-04-16  205  	n = buffer_op((unsigned long) src,
count, 0, strncpy_chunk_from_user,
^1da177e4c3f41 Linus Torvalds     2005-04-16  206  		      &ptr);
^1da177e4c3f41 Linus Torvalds     2005-04-16  207  	if (n != 0)
8ca842c4b5cbc7 Jeff Dike          2007-10-16  208  		return -EFAULT;
8ca842c4b5cbc7 Jeff Dike          2007-10-16  209  	return strnlen(dst, count);
^1da177e4c3f41 Linus Torvalds     2005-04-16  210  }
f8d65d27e677da Richard Weinberger 2015-05-12 @211  EXPORT_SYMBOL(__strncpy_from_user);
^1da177e4c3f41 Linus Torvalds     2005-04-16  212  
^1da177e4c3f41 Linus Torvalds     2005-04-16  213  static int clear_chunk(unsigned long
addr, int len, void *unused)
^1da177e4c3f41 Linus Torvalds     2005-04-16  214  {
^1da177e4c3f41 Linus Torvalds     2005-04-16  215  	memset((void *) addr, 0, len);
8ca842c4b5cbc7 Jeff Dike          2007-10-16  216  	return 0;
^1da177e4c3f41 Linus Torvalds     2005-04-16  217  }
^1da177e4c3f41 Linus Torvalds     2005-04-16  218  
f8d65d27e677da Richard Weinberger 2015-05-12  219  unsigned long __clear_user(void __user
*mem, unsigned long len)
^1da177e4c3f41 Linus Torvalds     2005-04-16  220  {
db68ce10c4f0a2 Al Viro            2017-03-20  221  	if (uaccess_kernel()) {
^1da177e4c3f41 Linus Torvalds     2005-04-16  222  		memset((__force void*)mem, 0, len);
8ca842c4b5cbc7 Jeff Dike          2007-10-16  223  		return 0;
^1da177e4c3f41 Linus Torvalds     2005-04-16  224  	}
^1da177e4c3f41 Linus Torvalds     2005-04-16  225  
f8d65d27e677da Richard Weinberger 2015-05-12  226  	return buffer_op((unsigned long) mem,
len, 1, clear_chunk, NULL);
^1da177e4c3f41 Linus Torvalds     2005-04-16  227  }
f8d65d27e677da Richard Weinberger 2015-05-12  228  EXPORT_SYMBOL(__clear_user);
^1da177e4c3f41 Linus Torvalds     2005-04-16  229  
^1da177e4c3f41 Linus Torvalds     2005-04-16  230  static int strnlen_chunk(unsigned long
str, int len, void *arg)
^1da177e4c3f41 Linus Torvalds     2005-04-16  231  {
^1da177e4c3f41 Linus Torvalds     2005-04-16  232  	int *len_ptr = arg, n;
^1da177e4c3f41 Linus Torvalds     2005-04-16  233  
^1da177e4c3f41 Linus Torvalds     2005-04-16  234  	n = strnlen((void *) str, len);
^1da177e4c3f41 Linus Torvalds     2005-04-16  235  	*len_ptr += n;
^1da177e4c3f41 Linus Torvalds     2005-04-16  236  
^1da177e4c3f41 Linus Torvalds     2005-04-16  237  	if (n < len)
8ca842c4b5cbc7 Jeff Dike          2007-10-16  238  		return 1;
8ca842c4b5cbc7 Jeff Dike          2007-10-16  239  	return 0;
^1da177e4c3f41 Linus Torvalds     2005-04-16  240  }
^1da177e4c3f41 Linus Torvalds     2005-04-16  241  
f8d65d27e677da Richard Weinberger 2015-05-12 @242  long __strnlen_user(const void __user
*str, long len)
^1da177e4c3f41 Linus Torvalds     2005-04-16  243  {
^1da177e4c3f41 Linus Torvalds     2005-04-16  244  	int count = 0, n;
^1da177e4c3f41 Linus Torvalds     2005-04-16  245  
db68ce10c4f0a2 Al Viro            2017-03-20  246  	if (uaccess_kernel())
8ca842c4b5cbc7 Jeff Dike          2007-10-16  247  		return strnlen((__force char*)str,
len) + 1;
^1da177e4c3f41 Linus Torvalds     2005-04-16  248  
^1da177e4c3f41 Linus Torvalds     2005-04-16  249  	n = buffer_op((unsigned long) str,
len, 0, strnlen_chunk, &count);
^1da177e4c3f41 Linus Torvalds     2005-04-16  250  	if (n == 0)
8ca842c4b5cbc7 Jeff Dike          2007-10-16  251  		return count + 1;
3179ce7254ffa4 Richard Weinberger 2013-05-11  252  	return 0;
^1da177e4c3f41 Linus Torvalds     2005-04-16  253  }
f8d65d27e677da Richard Weinberger 2015-05-12  254  EXPORT_SYMBOL(__strnlen_user);
dd3035a21ba7cc Anton Ivanov       2021-03-12  255  

:::::: The code at line 211 was first introduced by commit
:::::: f8d65d27e677da0ce33de570e3068308a77ed2b1 um: Rework uaccess code

:::::: TO: Richard Weinberger <richard(a)nod.at&gt;
:::::: CC: Richard Weinberger <richard(a)nod.at&gt;

---
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[kbuild-all] [arnd-playground:asm-generic-uaccess-4 1/7] arch/um/kernel/skas/uaccess.c:211:15: error: '__strncpy_from_user' undeclared here (not in a function); did you mean 'strncpy_from_user'?