[v13,03/10] bpf: Export bpf_dynptr_get_size()

Commit Message

Roberto Sassu Aug. 23, 2022, 3 p.m. UTC

From: Roberto Sassu <[e-mail]>

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 <[e-mail]>
Signed-off-by: Roberto Sassu <[e-mail]>
---
 include/linux/bpf.h  | 1 +
 kernel/bpf/helpers.c | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

Comments

KP Singh Aug. 27, 2022, 11:33 p.m. UTC | #1

On Tue, Aug 23, 2022 at 5:02 PM Roberto Sassu
<[e-mail]> wrote:
>
> From: Roberto Sassu <[e-mail]>
>
> 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 <[e-mail]>
> Signed-off-by: Roberto Sassu <[e-mail]>

Acked-by: KP Singh <[e-mail]>

Patch

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 39bd36359c1e..6041304b402e 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -2576,6 +2576,7 @@  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 3c1b9bbcf971..e4637ccb3016 100644
--- a/kernel/bpf/helpers.c
+++ b/kernel/bpf/helpers.c
@@ -1442,7 +1442,7 @@  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;
 }