Re: [PATCH v7 1/1] ptrace,syscall_user_dispatch: checkpoint/restore support for SUD

[kernel test robot <lkp@intel.com>]

Hi Gregory,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on linus/master]
[also build test WARNING on tip/core/entry v6.2-rc5 next-20230127]
[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-checkpoint-restore-support-for-SUD/20230128-145101
patch link:    https://lore.kernel.org/r/20230126190645.18341-2-gregory.price%40memverge.com
patch subject: [PATCH v7 1/1] ptrace,syscall_user_dispatch: checkpoint/restore support for SUD
config: x86_64-rhel-8.3-syz (https://download.01.org/0day-ci/archive/20230128/202301281932.AtpbMlh9-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-8) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/bc68df21f98617e74a8c5368a901041f89bdb17f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Gregory-Price/ptrace-syscall_user_dispatch-checkpoint-restore-support-for-SUD/20230128-145101
        git checkout bc68df21f98617e74a8c5368a901041f89bdb17f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 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@intel.com>

All warnings (new ones prefixed by >>):

   kernel/entry/syscall_user_dispatch.c: In function 'syscall_user_dispatch_get_config':
   kernel/entry/syscall_user_dispatch.c:114:45: error: storage size of 'config' isn't known
     114 |         struct syscall_user_dispatch_config config;
         |                                             ^~~~~~
   kernel/entry/syscall_user_dispatch.c:116:28: error: invalid application of 'sizeof' to incomplete type 'struct syscall_user_dispatch_config'
     116 |         if (size != sizeof(struct syscall_user_dispatch_config))
         |                            ^~~~~~
>> kernel/entry/syscall_user_dispatch.c:114:45: warning: unused variable 'config' [-Wunused-variable]
     114 |         struct syscall_user_dispatch_config config;
         |                                             ^~~~~~
   kernel/entry/syscall_user_dispatch.c: In function 'syscall_user_dispatch_set_config':
   kernel/entry/syscall_user_dispatch.c:137:45: error: storage size of 'config' isn't known
     137 |         struct syscall_user_dispatch_config config;
         |                                             ^~~~~~
   kernel/entry/syscall_user_dispatch.c:139:28: error: invalid application of 'sizeof' to incomplete type 'struct syscall_user_dispatch_config'
     139 |         if (size != sizeof(struct syscall_user_dispatch_config))
         |                            ^~~~~~
   kernel/entry/syscall_user_dispatch.c:137:45: warning: unused variable 'config' [-Wunused-variable]
     137 |         struct syscall_user_dispatch_config config;
         |                                             ^~~~~~
   kernel/entry/syscall_user_dispatch.c:147:1: error: control reaches end of non-void function [-Werror=return-type]
     147 | }
         | ^
   cc1: some warnings being treated as errors


vim +/config +114 kernel/entry/syscall_user_dispatch.c

   109	
   110	int syscall_user_dispatch_get_config(struct task_struct *task, unsigned long size,
   111			void __user *data)
   112	{
   113		struct syscall_user_dispatch *sd = &task->syscall_dispatch;
 > 114		struct syscall_user_dispatch_config config;
   115	
   116		if (size != sizeof(struct syscall_user_dispatch_config))
   117			return -EINVAL;
   118	
   119		if (test_syscall_work(SYSCALL_USER_DISPATCH))
   120			config.mode = PR_SYS_DISPATCH_ON;
   121		else
   122			config.mode = PR_SYS_DISPATCH_OFF;
   123	
   124		config.offset = sd->offset;
   125		config.len = sd->len;
   126		config.selector = sd->selector;
   127	
   128		if (copy_to_user(data, &config, sizeof(config)))
   129			return -EFAULT;
   130	
   131		return 0;
   132	}
   133	

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