linux-kernel - lib/test_kasan_module.c:90:26: sparse: sparse: incompatible types in comparison expression (different address spaces):

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Message-ID: <202111040340.6sti69Cb-lkp@intel.com>
Date:   Thu, 4 Nov 2021 03:33:50 +0800
From:   kernel test robot <lkp@...el.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: lib/test_kasan_module.c:90:26: sparse: sparse: incompatible types in
 comparison expression (different address spaces):

Hi Andrey,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   655fedaad36c0b31a6f6cb8f469b739b2359d74f
commit: 5d92bdffd2d53f98de683229c0ad7d028703fdba kasan: rename CONFIG_TEST_KASAN_MODULE
date:   8 months ago
config: s390-randconfig-s031-20211103 (attached as .config)
compiler: s390-linux-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5d92bdffd2d53f98de683229c0ad7d028703fdba
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout 5d92bdffd2d53f98de683229c0ad7d028703fdba
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>


sparse warnings: (new ones prefixed by >>)
>> lib/test_kasan_module.c:90:26: sparse: sparse: incompatible types in comparison expression (different address spaces):
>> lib/test_kasan_module.c:90:26: sparse:    struct kasan_rcu_info [noderef] __rcu *
>> lib/test_kasan_module.c:90:26: sparse:    struct kasan_rcu_info *

vim +90 lib/test_kasan_module.c

73228c7ecc5e40 Patricia Alfonso 2020-10-13  78  
73228c7ecc5e40 Patricia Alfonso 2020-10-13  79  static noinline void __init kasan_rcu_uaf(void)
73228c7ecc5e40 Patricia Alfonso 2020-10-13  80  {
73228c7ecc5e40 Patricia Alfonso 2020-10-13  81  	struct kasan_rcu_info *ptr;
73228c7ecc5e40 Patricia Alfonso 2020-10-13  82  
73228c7ecc5e40 Patricia Alfonso 2020-10-13  83  	pr_info("use-after-free in kasan_rcu_reclaim\n");
73228c7ecc5e40 Patricia Alfonso 2020-10-13  84  	ptr = kmalloc(sizeof(struct kasan_rcu_info), GFP_KERNEL);
73228c7ecc5e40 Patricia Alfonso 2020-10-13  85  	if (!ptr) {
73228c7ecc5e40 Patricia Alfonso 2020-10-13  86  		pr_err("Allocation failed\n");
73228c7ecc5e40 Patricia Alfonso 2020-10-13  87  		return;
73228c7ecc5e40 Patricia Alfonso 2020-10-13  88  	}
73228c7ecc5e40 Patricia Alfonso 2020-10-13  89  
73228c7ecc5e40 Patricia Alfonso 2020-10-13 @90  	global_rcu_ptr = rcu_dereference_protected(ptr, NULL);
73228c7ecc5e40 Patricia Alfonso 2020-10-13  91  	call_rcu(&global_rcu_ptr->rcu, kasan_rcu_reclaim);
73228c7ecc5e40 Patricia Alfonso 2020-10-13  92  }
73228c7ecc5e40 Patricia Alfonso 2020-10-13  93  

:::::: The code at line 90 was first introduced by commit
:::::: 73228c7ecc5e40c0851c4703c5ec6ed38123e989 KASAN: port KASAN Tests to KUnit

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

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

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