Re: [PATCH v9 04/11] LSM: syscalls for current process attributes

[kernel test robot]

Hi Casey,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/perf/core]
[also build test WARNING on acme/perf/core shuah-kselftest/next shuah-kselftest/fixes linus/master v6.3-rc7]
[cannot apply to next-20230421]
[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/Casey-Schaufler/LSM-Maintain-a-table-of-LSM-attribute-data/20230422-024331
base:   tip/perf/core
patch link:    https://lore.kernel.org/r/20230421174259.2458-5-casey%40schaufler-ca.com
patch subject: [PATCH v9 04/11] LSM: syscalls for current process attributes
config: mips-randconfig-s051-20230421 (https://download.01.org/0day-ci/archive/20230422/202304222142.YHgqLhGF-lkp@xxxxxxxxx/config)
compiler: mips64el-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/78ea54cc31d7bd9e5a5c7fe8cf34fba9516fde95
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Casey-Schaufler/LSM-Maintain-a-table-of-LSM-attribute-data/20230422-024331
        git checkout 78ea54cc31d7bd9e5a5c7fe8cf34fba9516fde95
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=mips SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-kbuild-all/202304222142.YHgqLhGF-lkp@xxxxxxxxx/

sparse warnings: (new ones prefixed by >>)
>> security/lsm_syscalls.c:34:48: sparse: sparse: dereference of noderef expression
--
   security/security.c:406:25: sparse: sparse: cast removes address space '__rcu' of expression
>> security/security.c:2196:13: sparse: sparse: dereference of noderef expression
   security/security.c:2203:14: sparse: sparse: dereference of noderef expression
   security/security.c:2208:20: sparse: sparse: dereference of noderef expression
   security/security.c:2218:43: sparse: sparse: dereference of noderef expression
   security/security.c:2218:66: sparse: sparse: dereference of noderef expression
   security/security.c:2263:13: sparse: sparse: dereference of noderef expression
   security/security.c:2265:13: sparse: sparse: dereference of noderef expression
   security/security.c:2269:13: sparse: sparse: dereference of noderef expression
   security/security.c:2269:32: sparse: sparse: dereference of noderef expression
   security/security.c:2275:53: sparse: sparse: dereference of noderef expression
   security/security.c:2275:64: sparse: sparse: dereference of noderef expression
   security/security.c:2275:70: sparse: sparse: dereference of noderef expression

vim +34 security/lsm_syscalls.c

    19	
    20	/**
    21	 * sys_lsm_set_self_attr - Set current task's security module attribute
    22	 * @attr: which attribute to set
    23	 * @ctx: the LSM contexts
    24	 * @size: size of @ctx
    25	 * @flags: reserved for future use
    26	 *
    27	 * Sets the calling task's LSM context. On success this function
    28	 * returns 0. If the attribute specified cannot be set a negative
    29	 * value indicating the reason for the error is returned.
    30	 */
    31	SYSCALL_DEFINE4(lsm_set_self_attr, unsigned int, attr, struct lsm_ctx __user *,
    32			ctx, size_t __user, size, u32, flags)
    33	{
  > 34		return security_setselfattr(attr, ctx, size, flags);
    35	}
    36	

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