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[v14,04/12] bpf: Export bpf_dynptr_get_size()

Message ID 20220830161716.754078-5-roberto.sassu@huaweicloud.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series bpf: Add kfuncs for PKCS#7 signature verification | expand

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Commit Message

Roberto Sassu Aug. 30, 2022, 4:17 p.m. UTC 
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(-)
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Patch

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;
 }