[brauner:ioctl_ns_get_init_pid 1/2] fs/nsfs.c:229:21: sparse: sparse: incorrect type in initializer (different address spaces)

[brauner:ioctl_ns_get_init_pid 1/2] fs/nsfs.c:229:21: sparse: sparse: incorrect type in initializer (different address spaces)

[kernel test robot]

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git ioctl_ns_get_init_pid
head:   8dddb03b10cf28c9bd139beaec8a92531a746a85
commit: 1ad81fd698dd7e6511c3db422eba42dec3ce1b08 [1/2] nsfs: add NS_GET_PID_{FROM,IN}_PIDNS
config: sh-randconfig-s031-20211104 (attached as .config)
compiler: sh4-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/brauner/linux.git/commit/?id=1ad81fd698dd7e6511c3db422eba42dec3ce1b08
        git remote add brauner https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git
        git fetch --no-tags brauner ioctl_ns_get_init_pid
        git checkout 1ad81fd698dd7e6511c3db422eba42dec3ce1b08
        # 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__' ARCH=sh 

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


sparse warnings: (new ones prefixed by >>)
>> fs/nsfs.c:229:21: sparse: sparse: incorrect type in initializer (different address spaces) @@     expected unsigned int const *__gu_addr @@     got unsigned int [noderef] [usertype] __user *[assigned] argp @@
   fs/nsfs.c:229:21: sparse:     expected unsigned int const *__gu_addr
   fs/nsfs.c:229:21: sparse:     got unsigned int [noderef] [usertype] __user *[assigned] argp
>> fs/nsfs.c:229:21: sparse: sparse: incorrect type in argument 1 (different address spaces) @@     expected void const volatile [noderef] __user *ptr @@     got unsigned int const *__gu_addr @@
   fs/nsfs.c:229:21: sparse:     expected void const volatile [noderef] __user *ptr
   fs/nsfs.c:229:21: sparse:     got unsigned int const *__gu_addr

vim +229 fs/nsfs.c

   188	
   189	static long ns_ioctl(struct file *filp, unsigned int ioctl,
   190				unsigned long arg)
   191	{
   192		struct user_namespace *user_ns;
   193		struct pid_namespace *pid_ns;
   194		struct task_struct *tsk;
   195		struct ns_common *ns = get_proc_ns(file_inode(filp));
   196		uid_t __user *argp;
   197		uid_t uid;
   198		pid_t pid_nr;
   199	
   200		switch (ioctl) {
   201		case NS_GET_USERNS:
   202			return open_related_ns(ns, ns_get_owner);
   203		case NS_GET_PARENT:
   204			if (!ns->ops->get_parent)
   205				return -EINVAL;
   206			return open_related_ns(ns, ns->ops->get_parent);
   207		case NS_GET_NSTYPE:
   208			return ns->ops->type;
   209		case NS_GET_OWNER_UID:
   210			if (ns->ops->type != CLONE_NEWUSER)
   211				return -EINVAL;
   212			user_ns = container_of(ns, struct user_namespace, ns);
   213			argp = (uid_t __user *) arg;
   214			uid = from_kuid_munged(current_user_ns(), user_ns->owner);
   215			return put_user(uid, argp);
   216		case NS_GET_PID_FROM_PIDNS:
   217			fallthrough;
   218		case NS_GET_PID_IN_PIDNS:
   219			if (ns->ops->type != CLONE_NEWPID)
   220				return -EINVAL;
   221	
   222			pid_ns = container_of(ns, struct pid_namespace, ns);
   223	
   224			/* Require the same privilege as for setns(). */
   225			if (!ns_capable(pid_ns->user_ns, CAP_SYS_ADMIN))
   226				return -EPERM;
   227	
   228			argp = (pid_t __user *)arg;
 > 229			if (get_user(pid_nr, argp))
   230				return -EFAULT;
   231	
   232			pid_nr = -ESRCH;
   233			rcu_read_lock();
   234			if (ioctl == NS_GET_PID_IN_PIDNS) {
   235				tsk = find_task_by_vpid(pid_nr);
   236				if (tsk)
   237					pid_nr = task_pid_nr_ns(tsk, pid_ns);
   238			} else {
   239				tsk = find_task_by_pid_ns(pid_nr, pid_ns);
   240				if (tsk)
   241					pid_nr = task_pid_vnr(tsk);
   242			}
   243			rcu_read_unlock();
   244	
   245			return pid_nr;
   246		default:
   247			return -ENOTTY;
   248		}
   249	}
   250	

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

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