[android-common:android12-5.10 4582/13739] lib/test_kasan_module.c:25:6: warning: variable 'unused' set but not used

[kernel test robot <lkp@intel.com>]

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Hi Andrey,

First bad commit (maybe != root cause):

tree:   https://android.googlesource.com/kernel/common android12-5.10
head:   8c9d9d8e44aa69102ed589e66a55e6ef93b834ef
commit: 916518ead7a5c918acbd0bdb48e8e5dd10e62bd8 [4582/13739] FROMGIT: kasan: rename CONFIG_TEST_KASAN_MODULE
config: x86_64-randconfig-a004-20211103 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 847a6807332b13f43704327c2d30103ec0347c77)
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
        git remote add android-common https://android.googlesource.com/kernel/common
        git fetch --no-tags android-common android12-5.10
        git checkout 916518ead7a5c918acbd0bdb48e8e5dd10e62bd8
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64 

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/test_kasan_module.c:25:6: warning: variable 'unused' set but not used [-Wunused-but-set-variable]
           int unused;
               ^
   1 warning generated.


vim +/unused +25 lib/test_kasan_module.c

73228c7ecc5e40c Patricia Alfonso 2020-10-13  19  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  20  static noinline void __init copy_user_test(void)
73228c7ecc5e40c Patricia Alfonso 2020-10-13  21  {
73228c7ecc5e40c Patricia Alfonso 2020-10-13  22  	char *kmem;
73228c7ecc5e40c Patricia Alfonso 2020-10-13  23  	char __user *usermem;
73228c7ecc5e40c Patricia Alfonso 2020-10-13  24  	size_t size = 10;
73228c7ecc5e40c Patricia Alfonso 2020-10-13 @25  	int unused;
73228c7ecc5e40c Patricia Alfonso 2020-10-13  26  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  27  	kmem = kmalloc(size, GFP_KERNEL);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  28  	if (!kmem)
73228c7ecc5e40c Patricia Alfonso 2020-10-13  29  		return;
73228c7ecc5e40c Patricia Alfonso 2020-10-13  30  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  31  	usermem = (char __user *)vm_mmap(NULL, 0, PAGE_SIZE,
73228c7ecc5e40c Patricia Alfonso 2020-10-13  32  			    PROT_READ | PROT_WRITE | PROT_EXEC,
73228c7ecc5e40c Patricia Alfonso 2020-10-13  33  			    MAP_ANONYMOUS | MAP_PRIVATE, 0);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  34  	if (IS_ERR(usermem)) {
73228c7ecc5e40c Patricia Alfonso 2020-10-13  35  		pr_err("Failed to allocate user memory\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  36  		kfree(kmem);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  37  		return;
73228c7ecc5e40c Patricia Alfonso 2020-10-13  38  	}
73228c7ecc5e40c Patricia Alfonso 2020-10-13  39  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  40  	pr_info("out-of-bounds in copy_from_user()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  41  	unused = copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  42  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  43  	pr_info("out-of-bounds in copy_to_user()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  44  	unused = copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  45  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  46  	pr_info("out-of-bounds in __copy_from_user()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  47  	unused = __copy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  48  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  49  	pr_info("out-of-bounds in __copy_to_user()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  50  	unused = __copy_to_user(usermem, kmem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  51  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  52  	pr_info("out-of-bounds in __copy_from_user_inatomic()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  53  	unused = __copy_from_user_inatomic(kmem, usermem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  54  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  55  	pr_info("out-of-bounds in __copy_to_user_inatomic()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  56  	unused = __copy_to_user_inatomic(usermem, kmem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  57  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  58  	pr_info("out-of-bounds in strncpy_from_user()\n");
73228c7ecc5e40c Patricia Alfonso 2020-10-13  59  	unused = strncpy_from_user(kmem, usermem, size + 1 + OOB_TAG_OFF);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  60  
73228c7ecc5e40c Patricia Alfonso 2020-10-13  61  	vm_munmap((unsigned long)usermem, PAGE_SIZE);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  62  	kfree(kmem);
73228c7ecc5e40c Patricia Alfonso 2020-10-13  63  }
73228c7ecc5e40c Patricia Alfonso 2020-10-13  64  

:::::: The code at line 25 was first introduced by commit
:::::: 73228c7ecc5e40c0851c4703c5ec6ed38123e989 KASAN: port KASAN Tests to KUnit

:::::: TO: Patricia Alfonso <trishalfonso@google.com>
:::::: CC: Linus Torvalds <torvalds@linux-foundation.org>

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

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