Re: [PATCH 2/2] NFSv4: check FMODE_EXEC from open context mode in nfs4_opendata_access()

[kernel test robot]

Hi ChenXiaoSong,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on trondmy-nfs/linux-next]
[also build test WARNING on linus/master v6.0-rc6 next-20220921]
[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/ChenXiaoSong/NFS-check-FMODE_EXEC-from-open-context-mode/20220922-105006
base:   git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next
config: arm64-randconfig-s041-20220921 (https://download.01.org/0day-ci/archive/20220923/202209231127.Fb4Qkx0m-lkp@xxxxxxxxx/config)
compiler: aarch64-linux-gcc (GCC) 12.1.0
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: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/74ed5473611c0257ea5fe8bb5e77f19d94d02596
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review ChenXiaoSong/NFS-check-FMODE_EXEC-from-open-context-mode/20220922-105006
        git checkout 74ed5473611c0257ea5fe8bb5e77f19d94d02596
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm64 SHELL=/bin/bash

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

sparse warnings: (new ones prefixed by >>)
>> fs/nfs/nfs4proc.c:2638:13: sparse: sparse: restricted fmode_t degrades to integer

vim +2638 fs/nfs/nfs4proc.c

  2616	
  2617	/*
  2618	 * Additional permission checks in order to distinguish between an
  2619	 * open for read, and an open for execute. This works around the
  2620	 * fact that NFSv4 OPEN treats read and execute permissions as being
  2621	 * the same.
  2622	 * Note that in the non-execute case, we want to turn off permission
  2623	 * checking if we just created a new file (POSIX open() semantics).
  2624	 */
  2625	static int nfs4_opendata_access(const struct cred *cred,
  2626					struct nfs4_opendata *opendata,
  2627					struct nfs4_state *state, fmode_t fmode)
  2628	{
  2629		struct nfs_access_entry cache;
  2630		u32 mask, flags;
  2631	
  2632		/* access call failed or for some reason the server doesn't
  2633		 * support any access modes -- defer access call until later */
  2634		if (opendata->o_res.access_supported == 0)
  2635			return 0;
  2636	
  2637		mask = 0;
> 2638		if (fmode & __FMODE_EXEC) {
  2639			/* ONLY check for exec rights */
  2640			if (S_ISDIR(state->inode->i_mode))
  2641				mask = NFS4_ACCESS_LOOKUP;
  2642			else
  2643				mask = NFS4_ACCESS_EXECUTE;
  2644		} else if ((fmode & FMODE_READ) && !opendata->file_created)
  2645			mask = NFS4_ACCESS_READ;
  2646	
  2647		nfs_access_set_mask(&cache, opendata->o_res.access_result);
  2648		nfs_access_add_cache(state->inode, &cache, cred);
  2649	
  2650		flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
  2651		if ((mask & ~cache.mask & flags) == 0)
  2652			return 0;
  2653	
  2654		return -EACCES;
  2655	}
  2656	

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