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Date:   Wed, 20 Jul 2022 15:25:34 +0800
From:   "xujia (Q)" <xujia39@...wei.com>
To:     Stanislav Fomichev <sdf@...gle.com>
CC:     <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andrii@...nel.org>
Subject: Re: [PATCH bpf-next] bpf: fix bpf compile error caused by
 CONFIG_CGROUP_BPF

It is fixed, not warning again. Thank you very much!

在 2022/7/19 23:46, Stanislav Fomichev 写道:
> On Tue, Jul 19, 2022 at 1:49 AM Xu Jia <xujia39@...wei.com> wrote:
>> We failed to compile when CONFIG_BPF_LSM is enabled but CONFIG_CGROUP_BPF
>> is not set. The failings are shown as below:
>>
>> kernel/bpf/trampoline.o: in function `bpf_trampoline_link_cgroup_shim'
>> trampoline.c: undefined reference to `bpf_cgroup_atype_get'
>> kernel/bpf/bpf_lsm.o: In function `bpf_lsm_find_cgroup_shim':
>> bpf_lsm.c: undefined reference to `__cgroup_bpf_run_lsm_current'
>> bpf_lsm.c: undefined reference to `__cgroup_bpf_run_lsm_sock'
>> bpf_lsm.c: undefined reference to `__cgroup_bpf_run_lsm_socket'
>>
>> Fix them by protecting these functions with CONFIG_CGROUP_BPF.
> Should be fixed by the following?
>
> https://lore.kernel.org/bpf/20220714185404.3647772-1-sdf@google.com/
>
>> Fixes: 69fd337a975c ("bpf: per-cgroup lsm flavor")
>> Signed-off-by: Xu Jia <xujia39@...wei.com>
>> ---
>>   include/linux/bpf.h     | 12 +++++++++---
>>   include/linux/bpf_lsm.h | 10 ++++++----
>>   kernel/bpf/bpf_lsm.c    |  2 ++
>>   kernel/bpf/trampoline.c |  2 ++
>>   4 files changed, 19 insertions(+), 7 deletions(-)
>>
>> diff --git a/include/linux/bpf.h b/include/linux/bpf.h
>> index 2b21f2a3452f..add8895c02cc 100644
>> --- a/include/linux/bpf.h
>> +++ b/include/linux/bpf.h
>> @@ -1255,9 +1255,7 @@ struct bpf_dummy_ops {
>>   int bpf_struct_ops_test_run(struct bpf_prog *prog, const union bpf_attr *kattr,
>>                              union bpf_attr __user *uattr);
>>   #endif
>> -int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
>> -                                   int cgroup_atype);
>> -void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
>> +
>>   #else
>>   static inline const struct bpf_struct_ops *bpf_struct_ops_find(u32 type_id)
>>   {
>> @@ -1281,6 +1279,14 @@ static inline int bpf_struct_ops_map_sys_lookup_elem(struct bpf_map *map,
>>   {
>>          return -EINVAL;
>>   }
>> +#endif
>> +
>> +#if defined(CONFIG_BPF_JIT) && defined(CONFIG_BPF_SYSCALL) && \
>> +    defined(CONFIG_CGROUP_BPF)
>> +int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
>> +                                   int cgroup_atype);
>> +void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog);
>> +#else
>>   static inline int bpf_trampoline_link_cgroup_shim(struct bpf_prog *prog,
>>                                                    int cgroup_atype)
>>   {
>> diff --git a/include/linux/bpf_lsm.h b/include/linux/bpf_lsm.h
>> index 4bcf76a9bb06..bed45a0c8a9c 100644
>> --- a/include/linux/bpf_lsm.h
>> +++ b/include/linux/bpf_lsm.h
>> @@ -42,8 +42,6 @@ extern const struct bpf_func_proto bpf_inode_storage_get_proto;
>>   extern const struct bpf_func_proto bpf_inode_storage_delete_proto;
>>   void bpf_inode_storage_free(struct inode *inode);
>>
>> -void bpf_lsm_find_cgroup_shim(const struct bpf_prog *prog, bpf_func_t *bpf_func);
>> -
>>   #else /* !CONFIG_BPF_LSM */
>>
>>   static inline bool bpf_lsm_is_sleepable_hook(u32 btf_id)
>> @@ -67,11 +65,15 @@ static inline void bpf_inode_storage_free(struct inode *inode)
>>   {
>>   }
>>
>> +#endif /* CONFIG_BPF_LSM */
>> +
>> +#if defined(CONFIG_BPF_LSM) && defined(CONFIG_BPF_CGROUP)
>> +void bpf_lsm_find_cgroup_shim(const struct bpf_prog *prog, bpf_func_t *bpf_func);
>> +#else
>>   static inline void bpf_lsm_find_cgroup_shim(const struct bpf_prog *prog,
>>                                             bpf_func_t *bpf_func)
>>   {
>>   }
>> -
>> -#endif /* CONFIG_BPF_LSM */
>> +#endif
>>
>>   #endif /* _LINUX_BPF_LSM_H */
>> diff --git a/kernel/bpf/bpf_lsm.c b/kernel/bpf/bpf_lsm.c
>> index d469b7f3deef..29527828b38b 100644
>> --- a/kernel/bpf/bpf_lsm.c
>> +++ b/kernel/bpf/bpf_lsm.c
>> @@ -63,6 +63,7 @@ BTF_ID(func, bpf_lsm_socket_post_create)
>>   BTF_ID(func, bpf_lsm_socket_socketpair)
>>   BTF_SET_END(bpf_lsm_unlocked_sockopt_hooks)
>>
>> +#ifdef CONFIG_BPF_CGROUP
>>   void bpf_lsm_find_cgroup_shim(const struct bpf_prog *prog,
>>                               bpf_func_t *bpf_func)
>>   {
>> @@ -86,6 +87,7 @@ void bpf_lsm_find_cgroup_shim(const struct bpf_prog *prog,
>>   #endif
>>                  *bpf_func = __cgroup_bpf_run_lsm_current;
>>   }
>> +#endif /* CONFIG_BPF_CGROUP */
>>
>>   int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
>>                          const struct bpf_prog *prog)
>> diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
>> index 6cd226584c33..127924711935 100644
>> --- a/kernel/bpf/trampoline.c
>> +++ b/kernel/bpf/trampoline.c
>> @@ -525,6 +525,7 @@ static const struct bpf_link_ops bpf_shim_tramp_link_lops = {
>>          .dealloc = bpf_shim_tramp_link_dealloc,
>>   };
>>
>> +#ifdef CONFIG_CGROUP_BPF
>>   static struct bpf_shim_tramp_link *cgroup_shim_alloc(const struct bpf_prog *prog,
>>                                                       bpf_func_t bpf_func,
>>                                                       int cgroup_atype)
>> @@ -668,6 +669,7 @@ void bpf_trampoline_unlink_cgroup_shim(struct bpf_prog *prog)
>>
>>          bpf_trampoline_put(tr); /* bpf_trampoline_lookup above */
>>   }
>> +#endif /* CONFIG_CGROUP_BPF */
>>   #endif
>>
>>   struct bpf_trampoline *bpf_trampoline_get(u64 key,
>> --
>> 2.25.1
>>
> .

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