Re: [PATCH v15 2/3] binder: report txn errors via generic netlink

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

Hi Li,

kernel test robot noticed the following build errors:

[auto build test ERROR on 8433c776e1eb1371f5cd40b5fd3a61f9c7b7f3ad]

url:    https://github.com/intel-lab-lkp/linux/commits/Li-Li/lsm-selinux-Add-setup_report-permission-to-binder/20250227-032351
base:   8433c776e1eb1371f5cd40b5fd3a61f9c7b7f3ad
patch link:    https://lore.kernel.org/r/20250226192047.734627-3-dualli%40chromium.org
patch subject: [PATCH v15 2/3] binder: report txn errors via generic netlink
config: arm-randconfig-001-20250227 (https://download.01.org/0day-ci/archive/20250228/202502280430.x785GFat-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250228/202502280430.x785GFat-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/202502280430.x785GFat-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/android/binder.c: In function 'binder_nl_report_setup_doit':
>> drivers/android/binder.c:6479:15: error: implicit declaration of function 'security_binder_setup_report' [-Wimplicit-function-declaration]
    6479 |         ret = security_binder_setup_report(current_cred());
         |               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~


vim +/security_binder_setup_report +6479 drivers/android/binder.c

  6462	
  6463	/**
  6464	 * binder_nl_report_setup_doit() - netlink .doit handler
  6465	 * @skb:	the metadata struct passed from netlink driver
  6466	 * @info:	the generic netlink struct passed from netlink driver
  6467	 *
  6468	 * Implements the .doit function to process binder netlink commands.
  6469	 */
  6470	int binder_nl_report_setup_doit(struct sk_buff *skb, struct genl_info *info)
  6471	{
  6472		struct binder_context *context = NULL;
  6473		struct binder_device *device;
  6474		struct binder_proc *proc;
  6475		u32 flags, pid;
  6476		void *hdr;
  6477		int ret;
  6478	
> 6479		ret = security_binder_setup_report(current_cred());
  6480		if (ret < 0) {
  6481			NL_SET_ERR_MSG(info->extack, "Permission denied");
  6482			return ret;
  6483		}
  6484	
  6485		hlist_for_each_entry(device, &binder_devices, hlist) {
  6486			if (!nla_strcmp(info->attrs[BINDER_A_CMD_CONTEXT],
  6487					device->context.name)) {
  6488				context = &device->context;
  6489				break;
  6490			}
  6491		}
  6492	
  6493		if (!context) {
  6494			NL_SET_ERR_MSG(info->extack, "Unknown binder context");
  6495			return -EINVAL;
  6496		}
  6497	
  6498		pid = nla_get_u32(info->attrs[BINDER_A_CMD_PID]);
  6499		flags = nla_get_u32(info->attrs[BINDER_A_CMD_FLAGS]);
  6500	
  6501		if (!pid) {
  6502			/* Set the global flags for the whole binder context */
  6503			context->report_flags = flags;
  6504		} else {
  6505			/* Set the per-process flags */
  6506			proc = binder_find_proc(pid);
  6507			if (!proc) {
  6508				NL_SET_ERR_MSG_FMT(info->extack,
  6509						   "Invalid binder report pid %u",
  6510						   pid);
  6511				ret = -EINVAL;
  6512				goto err_exit;
  6513			}
  6514	
  6515			proc->report_flags = flags;
  6516		}
  6517	
  6518		skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL);
  6519		if (!skb) {
  6520			pr_err("Failed to alloc binder netlink reply message\n");
  6521			ret = -ENOMEM;
  6522			goto err_exit;
  6523		}
  6524	
  6525		hdr = genlmsg_iput(skb, info);
  6526		if (!hdr)
  6527			goto free_skb;
  6528	
  6529		if (nla_put_string(skb, BINDER_A_CMD_CONTEXT, context->name) ||
  6530		    nla_put_u32(skb, BINDER_A_CMD_PID, pid) ||
  6531		    nla_put_u32(skb, BINDER_A_CMD_FLAGS, flags))
  6532			goto cancel_skb;
  6533	
  6534		genlmsg_end(skb, hdr);
  6535	
  6536		if (genlmsg_reply(skb, info)) {
  6537			pr_err("Failed to send binder netlink reply message\n");
  6538			ret = -EFAULT;
  6539			goto err_exit;
  6540		}
  6541	
  6542		return 0;
  6543	
  6544	cancel_skb:
  6545		pr_err("Failed to add reply attributes to binder netlink message\n");
  6546		genlmsg_cancel(skb, hdr);
  6547	free_skb:
  6548		pr_err("Free binder netlink reply message on error\n");
  6549		nlmsg_free(skb);
  6550		ret = -EMSGSIZE;
  6551	err_exit:
  6552		return ret;
  6553	}
  6554	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki