Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Roberto Sassu <roberto.sassu@huaweicloud.com>
To:     ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
        martin.lau@linux.dev, song@kernel.org, yhs@fb.com,
        john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com,
        haoluo@google.com, jolsa@kernel.org, mykolal@fb.com,
        dhowells@redhat.com, jarkko@kernel.org, rostedt@goodmis.org,
        mingo@redhat.com, paul@paul-moore.com, jmorris@namei.org,
        serge@hallyn.com, shuah@kernel.org
Cc:     bpf@vger.kernel.org, keyrings@vger.kernel.org,
        linux-security-module@vger.kernel.org,
        linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
        deso@posteo.net, memxor@gmail.com,
        Roberto Sassu <roberto.sassu@huawei.com>,
        Joanne Koong <joannelkoong@gmail.com>
Subject: [PATCH v14 04/12] bpf: Export bpf_dynptr_get_size()
Date:   Tue, 30 Aug 2022 18:17:08 +0200
Message-Id: <20220830161716.754078-5-roberto.sassu@huaweicloud.com>
In-Reply-To: <20220830161716.754078-1-roberto.sassu@huaweicloud.com>
References: <20220830161716.754078-1-roberto.sassu@huaweicloud.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Roberto Sassu <roberto.sassu@huawei.com>

Export bpf_dynptr_get_size(), so that kernel code dealing with eBPF dynamic
pointers can obtain the real size of data carried by this data structure.

Reviewed-by: Joanne Koong <joannelkoong@gmail.com>
Acked-by: KP Singh <kpsingh@kernel.org>
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
---
 include/linux/bpf.h  | 1 +
 kernel/bpf/helpers.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 9c1674973e03..9dbd7c3f8929 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -2585,6 +2585,7 @@ void bpf_dynptr_init(struct bpf_dynptr_kern *ptr, void *data,
 		     enum bpf_dynptr_type type, u32 offset, u32 size);
 void bpf_dynptr_set_null(struct bpf_dynptr_kern *ptr);
 int bpf_dynptr_check_size(u32 size);
+u32 bpf_dynptr_get_size(struct bpf_dynptr_kern *ptr);
 
 #ifdef CONFIG_BPF_LSM
 void bpf_cgroup_atype_get(u32 attach_btf_id, int cgroup_atype);
diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c
index fc08035f14ed..824864ac82d1 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1408,7 +1408,7 @@ static void bpf_dynptr_set_type(struct bpf_dynptr_kern *ptr, enum bpf_dynptr_typ
 	ptr->size |= type << DYNPTR_TYPE_SHIFT;
 }
 
-static u32 bpf_dynptr_get_size(struct bpf_dynptr_kern *ptr)
+u32 bpf_dynptr_get_size(struct bpf_dynptr_kern *ptr)
 {
 	return ptr->size & DYNPTR_SIZE_MASK;
 }
-- 
2.25.1