Re: [PATCH 3/3] ptrace,syscall_user_dispatch: add a getter/setter for sud configuration

[kernel test robot <lkp@xxxxxxxxx>]

Hi Gregory,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on v6.2-rc4 next-20230118]
[cannot apply to tip/core/entry]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Gregory-Price/ptrace-syscall_user_dispatch-Implement-Syscall-User-Dispatch-Suspension/20230119-041259
patch link:    https://lore.kernel.org/r/20230118201055.147228-4-gregory.price%40memverge.com
patch subject: [PATCH 3/3] ptrace,syscall_user_dispatch: add a getter/setter for sud configuration
config: x86_64-randconfig-s022 (https://download.01.org/0day-ci/archive/20230119/202301191010.U5yAKr05-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/bd6833b41ed48c444c09346f695efe229deec2e9
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Gregory-Price/ptrace-syscall_user_dispatch-Implement-Syscall-User-Dispatch-Suspension/20230119-041259
        git checkout bd6833b41ed48c444c09346f695efe229deec2e9
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 olddefconfig
        make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/entry/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>

sparse warnings: (new ones prefixed by >>)
>> kernel/entry/syscall_user_dispatch.c:128:33: sparse: sparse: incorrect type in assignment (different address spaces) @@     expected signed char [usertype] *[assigned] selector @@     got char [noderef] __user *selector @@
   kernel/entry/syscall_user_dispatch.c:128:33: sparse:     expected signed char [usertype] *[assigned] selector
   kernel/entry/syscall_user_dispatch.c:128:33: sparse:     got char [noderef] __user *selector
>> kernel/entry/syscall_user_dispatch.c:156:31: sparse: sparse: incorrect type in argument 4 (different address spaces) @@     expected char [noderef] __user *selector @@     got signed char [usertype] *[addressable] selector @@
   kernel/entry/syscall_user_dispatch.c:156:31: sparse:     expected char [noderef] __user *selector
   kernel/entry/syscall_user_dispatch.c:156:31: sparse:     got signed char [usertype] *[addressable] selector

vim +128 kernel/entry/syscall_user_dispatch.c

   114	
   115	int syscall_user_dispatch_get_config(struct task_struct *task, unsigned long size,
   116			void __user *data)
   117	{
   118		struct syscall_user_dispatch *sd = &task->syscall_dispatch;
   119		struct syscall_user_dispatch_config config;
   120	
   121		if (size != sizeof(struct syscall_user_dispatch_config))
   122			return -EINVAL;
   123	
   124		if (sd->selector) {
   125			config.mode = PR_SYS_DISPATCH_ON;
   126			config.offset = sd->offset;
   127			config.len = sd->len;
 > 128			config.selector = sd->selector;
   129			config.on_dispatch = sd->on_dispatch;
   130		} else {
   131			config.mode = PR_SYS_DISPATCH_OFF;
   132			config.offset = 0;
   133			config.len = 0;
   134			config.selector = NULL;
   135			config.on_dispatch = false;
   136		}
   137		if (copy_to_user(data, &config, sizeof(config)))
   138			return -EFAULT;
   139	
   140		return 0;
   141	}
   142	
   143	int syscall_user_dispatch_set_config(struct task_struct *task, unsigned long size,
   144			void __user *data)
   145	{
   146		struct syscall_user_dispatch_config config;
   147		int ret;
   148	
   149		if (size != sizeof(struct syscall_user_dispatch_config))
   150			return -EINVAL;
   151	
   152		if (copy_from_user(&config, data, sizeof(config)))
   153			return -EFAULT;
   154	
   155		ret = set_syscall_user_dispatch(config.mode, config.offset, config.len,
 > 156				config.selector);

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