netdev - Re: [PATCH v2 bpf-next 2/4] bpf: Support associating BPF program with struct

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <202510180007.IYugtu6G-lkp@intel.com>
Date: Sat, 18 Oct 2025 01:05:23 +0800
From: kernel test robot <lkp@...el.com>
To: Amery Hung <ameryhung@...il.com>, bpf@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	netdev@...r.kernel.org, alexei.starovoitov@...il.com,
	andrii@...nel.org, daniel@...earbox.net, tj@...nel.org,
	martin.lau@...nel.org, ameryhung@...il.com, kernel-team@...a.com
Subject: Re: [PATCH v2 bpf-next 2/4] bpf: Support associating BPF program
 with struct_ops

Hi Amery,

kernel test robot noticed the following build errors:

[auto build test ERROR on bpf-next/master]

url:    https://github.com/intel-lab-lkp/linux/commits/Amery-Hung/bpf-Allow-verifier-to-fixup-kernel-module-kfuncs/20251017-044703
base:   https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
patch link:    https://lore.kernel.org/r/20251016204503.3203690-3-ameryhung%40gmail.com
patch subject: [PATCH v2 bpf-next 2/4] bpf: Support associating BPF program with struct_ops
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20251018/202510180007.IYugtu6G-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251018/202510180007.IYugtu6G-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202510180007.IYugtu6G-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/bpf/core.c:2881:3: error: call to undeclared function 'bpf_struct_ops_put'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    2881 |                 bpf_struct_ops_put(aux->st_ops_assoc);
         |                 ^
   kernel/bpf/core.c:2881:3: note: did you mean 'bpf_struct_ops_find'?
   include/linux/btf.h:538:49: note: 'bpf_struct_ops_find' declared here
     538 | static inline const struct bpf_struct_ops_desc *bpf_struct_ops_find(struct btf *btf, u32 type_id)
         |                                                 ^
   1 error generated.


vim +/bpf_struct_ops_put +2881 kernel/bpf/core.c

  2863	
  2864	static void bpf_prog_free_deferred(struct work_struct *work)
  2865	{
  2866		struct bpf_prog_aux *aux;
  2867		int i;
  2868	
  2869		aux = container_of(work, struct bpf_prog_aux, work);
  2870	#ifdef CONFIG_BPF_SYSCALL
  2871		bpf_free_kfunc_btf_tab(aux->kfunc_btf_tab);
  2872		bpf_prog_stream_free(aux->prog);
  2873	#endif
  2874	#ifdef CONFIG_CGROUP_BPF
  2875		if (aux->cgroup_atype != CGROUP_BPF_ATTACH_TYPE_INVALID)
  2876			bpf_cgroup_atype_put(aux->cgroup_atype);
  2877	#endif
  2878		bpf_free_used_maps(aux);
  2879		bpf_free_used_btfs(aux);
  2880		if (aux->st_ops_assoc) {
> 2881			bpf_struct_ops_put(aux->st_ops_assoc);
  2882			bpf_prog_disassoc_struct_ops(aux->prog);
  2883		}
  2884		if (bpf_prog_is_dev_bound(aux))
  2885			bpf_prog_dev_bound_destroy(aux->prog);
  2886	#ifdef CONFIG_PERF_EVENTS
  2887		if (aux->prog->has_callchain_buf)
  2888			put_callchain_buffers();
  2889	#endif
  2890		if (aux->dst_trampoline)
  2891			bpf_trampoline_put(aux->dst_trampoline);
  2892		for (i = 0; i < aux->real_func_cnt; i++) {
  2893			/* We can just unlink the subprog poke descriptor table as
  2894			 * it was originally linked to the main program and is also
  2895			 * released along with it.
  2896			 */
  2897			aux->func[i]->aux->poke_tab = NULL;
  2898			bpf_jit_free(aux->func[i]);
  2899		}
  2900		if (aux->real_func_cnt) {
  2901			kfree(aux->func);
  2902			bpf_prog_unlock_free(aux->prog);
  2903		} else {
  2904			bpf_jit_free(aux->prog);
  2905		}
  2906	}
  2907	

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