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    Subject[PATCH v11 3/9] bpf: Export bpf_dynptr_get_size()
    Date
    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>
    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 a627a02cf8ab..a82f8c559ae2 100644
    --- a/include/linux/bpf.h
    +++ b/include/linux/bpf.h
    @@ -2563,6 +2563,7 @@ 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;
    }
    --
    2.25.1
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