linux-kernel - [arnd-playground:compat-alloc-user-space-10 1/40] kernel/kexec.c:274:52: sparse: sparse: incorrect type in argument 3 (different address spaces)

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Message-ID: <202107201226.681AIMm6-lkp@intel.com>
Date:   Tue, 20 Jul 2021 12:37:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [arnd-playground:compat-alloc-user-space-10 1/40]
 kernel/kexec.c:274:52: sparse: sparse: incorrect type in argument 3
 (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git compat-alloc-user-space-10
head:   58da7172523fefac0902591b73596ce2b21e5038
commit: 5357a3311b528fbd96e088885c5c17a5ce670ad7 [1/40] kexec: avoid compat_alloc_user_space
config: i386-randconfig-s002-20210720 (attached as .config)
compiler: gcc-10 (Ubuntu 10.3.0-1ubuntu1~20.04) 10.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.3-341-g8af24329-dirty
        # https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git/commit/?id=5357a3311b528fbd96e088885c5c17a5ce670ad7
        git remote add arnd-playground https://git.kernel.org/pub/scm/linux/kernel/git/arnd/playground.git
        git fetch --no-tags arnd-playground compat-alloc-user-space-10
        git checkout 5357a3311b528fbd96e088885c5c17a5ce670ad7
        # save the attached .config to linux build tree
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=i386 

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 >>)
>> kernel/kexec.c:274:52: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected struct kexec_segment *segments @@     got struct kexec_segment [noderef] __user *segments @@
   kernel/kexec.c:274:52: sparse:     expected struct kexec_segment *segments
   kernel/kexec.c:274:52: sparse:     got struct kexec_segment [noderef] __user *segments

vim +274 kernel/kexec.c

6b27aef09fea32 Dominik Brodowski 2018-03-17  254  
6b27aef09fea32 Dominik Brodowski 2018-03-17  255  SYSCALL_DEFINE4(kexec_load, unsigned long, entry, unsigned long, nr_segments,
6b27aef09fea32 Dominik Brodowski 2018-03-17  256  		struct kexec_segment __user *, segments, unsigned long, flags)
6b27aef09fea32 Dominik Brodowski 2018-03-17  257  {
5357a3311b528f Arnd Bergmann     2021-05-19  258  	struct kexec_segment *ksegments;
5357a3311b528f Arnd Bergmann     2021-05-19  259  	unsigned long bytes, result;
6b27aef09fea32 Dominik Brodowski 2018-03-17  260  
6b27aef09fea32 Dominik Brodowski 2018-03-17  261  	result = kexec_load_check(nr_segments, flags);
6b27aef09fea32 Dominik Brodowski 2018-03-17  262  	if (result)
6b27aef09fea32 Dominik Brodowski 2018-03-17  263  		return result;
6b27aef09fea32 Dominik Brodowski 2018-03-17  264  
5357a3311b528f Arnd Bergmann     2021-05-19  265  	bytes = nr_segments * sizeof(ksegments[0]);
5357a3311b528f Arnd Bergmann     2021-05-19  266  	ksegments = kmalloc(bytes, GFP_KERNEL);
5357a3311b528f Arnd Bergmann     2021-05-19  267  	if (!ksegments)
5357a3311b528f Arnd Bergmann     2021-05-19  268  		return -ENOMEM;
6b27aef09fea32 Dominik Brodowski 2018-03-17  269  
5357a3311b528f Arnd Bergmann     2021-05-19  270  	result = copy_from_user(ksegments, segments, bytes);
5357a3311b528f Arnd Bergmann     2021-05-19  271  	if (result)
5357a3311b528f Arnd Bergmann     2021-05-19  272  		goto fail;
72414d3f1d22fc Maneesh Soni      2005-06-25  273  
0eea08678ebe9f Minfei Huang      2016-05-23 @274  	result = do_kexec_load(entry, nr_segments, segments, flags);
9b492cf58077a0 Xunlei Pang       2016-05-23  275  
5357a3311b528f Arnd Bergmann     2021-05-19  276  fail:
5357a3311b528f Arnd Bergmann     2021-05-19  277  	kfree(ksegments);
dc009d92435f99 Eric W. Biederman 2005-06-25  278  	return result;
dc009d92435f99 Eric W. Biederman 2005-06-25  279  }
dc009d92435f99 Eric W. Biederman 2005-06-25  280  

:::::: The code at line 274 was first introduced by commit
:::::: 0eea08678ebe9f7d8ef98fed974a5bf1a0dd2dd2 kexec: do a cleanup for function kexec_load

:::::: TO: Minfei Huang <mnfhuang@...il.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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