Re: [PATCH] lsm,selinux: Add LSM blob support for BPF objects

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

Hi Blaise,

kernel test robot noticed the following build warnings:

[auto build test WARNING on pcmoore-selinux/next]
[also build test WARNING on linus/master v6.16-rc6 next-20250715]
[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/Blaise-Boscaccy/lsm-selinux-Add-LSM-blob-support-for-BPF-objects/20250716-062844
base:   https://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux.git next
patch link:    https://lore.kernel.org/r/20250715222655.705241-1-bboscaccy%40linux.microsoft.com
patch subject: [PATCH] lsm,selinux: Add LSM blob support for BPF objects
config: x86_64-defconfig (https://download.01.org/0day-ci/archive/20250716/202507161903.ToApi2Jk-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-12) 11.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250716/202507161903.ToApi2Jk-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202507161903.ToApi2Jk-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> security/security.c:896:12: warning: 'lsm_bpf_token_alloc' defined but not used [-Wunused-function]
     896 | static int lsm_bpf_token_alloc(struct bpf_token *token)
         |            ^~~~~~~~~~~~~~~~~~~
>> security/security.c:874:12: warning: 'lsm_bpf_prog_alloc' defined but not used [-Wunused-function]
     874 | static int lsm_bpf_prog_alloc(struct bpf_prog *prog)
         |            ^~~~~~~~~~~~~~~~~~
>> security/security.c:852:12: warning: 'lsm_bpf_map_alloc' defined but not used [-Wunused-function]
     852 | static int lsm_bpf_map_alloc(struct bpf_map *map)
         |            ^~~~~~~~~~~~~~~~~


vim +/lsm_bpf_token_alloc +896 security/security.c

   843	
   844	/**
   845	 * lsm_bpf_map_alloc - allocate a composite bpf_map blob
   846	 * @map: the bpf_map that needs a blob
   847	 *
   848	 * Allocate the bpf_map blob for all the modules
   849	 *
   850	 * Returns 0, or -ENOMEM if memory can't be allocated.
   851	 */
 > 852	static int lsm_bpf_map_alloc(struct bpf_map *map)
   853	{
   854		if (blob_sizes.lbs_bpf_map == 0) {
   855			map->security = NULL;
   856			return 0;
   857		}
   858	
   859		map->security = kzalloc(blob_sizes.lbs_bpf_map, GFP_KERNEL);
   860		if (!map->security)
   861			return -ENOMEM;
   862	
   863		return 0;
   864	}
   865	
   866	/**
   867	 * lsm_bpf_prog_alloc - allocate a composite bpf_prog blob
   868	 * @prog: the bpf_prog that needs a blob
   869	 *
   870	 * Allocate the bpf_prog blob for all the modules
   871	 *
   872	 * Returns 0, or -ENOMEM if memory can't be allocated.
   873	 */
 > 874	static int lsm_bpf_prog_alloc(struct bpf_prog *prog)
   875	{
   876		if (blob_sizes.lbs_bpf_prog == 0) {
   877			prog->aux->security = NULL;
   878			return 0;
   879		}
   880	
   881		prog->aux->security = kzalloc(blob_sizes.lbs_bpf_prog, GFP_KERNEL);
   882		if (!prog->aux->security)
   883			return -ENOMEM;
   884	
   885		return 0;
   886	}
   887	
   888	/**
   889	 * lsm_bpf_token_alloc - allocate a composite bpf_token blob
   890	 * @token: the bpf_token that needs a blob
   891	 *
   892	 * Allocate the bpf_token blob for all the modules
   893	 *
   894	 * Returns 0, or -ENOMEM if memory can't be allocated.
   895	 */
 > 896	static int lsm_bpf_token_alloc(struct bpf_token *token)
   897	{
   898		if (blob_sizes.lbs_bpf_token == 0) {
   899			token->security = NULL;
   900			return 0;
   901		}
   902	
   903		token->security = kzalloc(blob_sizes.lbs_bpf_token, GFP_KERNEL);
   904		if (!token->security)
   905			return -ENOMEM;
   906	
   907		return 0;
   908	}
   909	

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