linux-kernel - [mcgrof-next:20211116-sysctl-cleanups-v4 21/35] kernel/printk/sysctl.c:20:51: sparse: sparse: incorrect type in argument 3 (different address spaces)

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Message-ID: <202111171725.4A81JVz7-lkp@intel.com>
Date:   Wed, 17 Nov 2021 17:15:37 +0800
From:   kernel test robot <lkp@...el.com>
To:     Xiaoming Ni <nixiaoming@...wei.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: [mcgrof-next:20211116-sysctl-cleanups-v4 21/35]
 kernel/printk/sysctl.c:20:51: sparse: sparse: incorrect type in argument 3
 (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git 20211116-sysctl-cleanups-v4
head:   5347239461f25fc50aa761923245b9ec4a4aafec
commit: b8c066c91c9a2a236ca09ea16d967448bdbe7bb0 [21/35] printk: move printk sysctl to printk/sysctl.c
config: m68k-randconfig-s031-20211117 (attached as .config)
compiler: m68k-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/mcgrof/linux-next.git/commit/?id=b8c066c91c9a2a236ca09ea16d967448bdbe7bb0
        git remote add mcgrof-next https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git
        git fetch --no-tags mcgrof-next 20211116-sysctl-cleanups-v4
        git checkout b8c066c91c9a2a236ca09ea16d967448bdbe7bb0
        # 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=m68k 

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/printk/sysctl.c:20:51: sparse: sparse: incorrect type in argument 3 (different address spaces) @@     expected void * @@     got void [noderef] __user *buffer @@
   kernel/printk/sysctl.c:20:51: sparse:     expected void *
   kernel/printk/sysctl.c:20:51: sparse:     got void [noderef] __user *buffer
>> kernel/printk/sysctl.c:66:35: sparse: sparse: incorrect type in initializer (incompatible argument 3 (different address spaces)) @@     expected int ( [usertype] *proc_handler )( ... ) @@     got int ( * )( ... ) @@
   kernel/printk/sysctl.c:66:35: sparse:     expected int ( [usertype] *proc_handler )( ... )
   kernel/printk/sysctl.c:66:35: sparse:     got int ( * )( ... )
   kernel/printk/sysctl.c:75:35: sparse: sparse: incorrect type in initializer (incompatible argument 3 (different address spaces)) @@     expected int ( [usertype] *proc_handler )( ... ) @@     got int ( * )( ... ) @@
   kernel/printk/sysctl.c:75:35: sparse:     expected int ( [usertype] *proc_handler )( ... )
   kernel/printk/sysctl.c:75:35: sparse:     got int ( * )( ... )

vim +20 kernel/printk/sysctl.c

    13	
    14	static int proc_dointvec_minmax_sysadmin(struct ctl_table *table, int write,
    15					void __user *buffer, size_t *lenp, loff_t *ppos)
    16	{
    17		if (write && !capable(CAP_SYS_ADMIN))
    18			return -EPERM;
    19	
  > 20		return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
    21	}
    22	
    23	static struct ctl_table printk_sysctls[] = {
    24		{
    25			.procname	= "printk",
    26			.data		= &console_loglevel,
    27			.maxlen		= 4*sizeof(int),
    28			.mode		= 0644,
    29			.proc_handler	= proc_dointvec,
    30		},
    31		{
    32			.procname	= "printk_ratelimit",
    33			.data		= &printk_ratelimit_state.interval,
    34			.maxlen		= sizeof(int),
    35			.mode		= 0644,
    36			.proc_handler	= proc_dointvec_jiffies,
    37		},
    38		{
    39			.procname	= "printk_ratelimit_burst",
    40			.data		= &printk_ratelimit_state.burst,
    41			.maxlen		= sizeof(int),
    42			.mode		= 0644,
    43			.proc_handler	= proc_dointvec,
    44		},
    45		{
    46			.procname	= "printk_delay",
    47			.data		= &printk_delay_msec,
    48			.maxlen		= sizeof(int),
    49			.mode		= 0644,
    50			.proc_handler	= proc_dointvec_minmax,
    51			.extra1		= SYSCTL_ZERO,
    52			.extra2		= (void *)&ten_thousand,
    53		},
    54		{
    55			.procname	= "printk_devkmsg",
    56			.data		= devkmsg_log_str,
    57			.maxlen		= DEVKMSG_STR_MAX_SIZE,
    58			.mode		= 0644,
    59			.proc_handler	= devkmsg_sysctl_set_loglvl,
    60		},
    61		{
    62			.procname	= "dmesg_restrict",
    63			.data		= &dmesg_restrict,
    64			.maxlen		= sizeof(int),
    65			.mode		= 0644,
  > 66			.proc_handler	= proc_dointvec_minmax_sysadmin,
    67			.extra1		= SYSCTL_ZERO,
    68			.extra2		= SYSCTL_ONE,
    69		},
    70		{
    71			.procname	= "kptr_restrict",
    72			.data		= &kptr_restrict,
    73			.maxlen		= sizeof(int),
    74			.mode		= 0644,
    75			.proc_handler	= proc_dointvec_minmax_sysadmin,
    76			.extra1		= SYSCTL_ZERO,
    77			.extra2		= SYSCTL_TWO,
    78		},
    79		{}
    80	};
    81	

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

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