On Thu, Jun 2, 2022 at 7:38 AM Roberto Sassu <roberto.sassu@xxxxxxxxxx> wrote:
>
> Introduce the bpf_obj_get_flags() function, so that it is possible to
> specify the needed permissions for obtaining a file descriptor from a
> pinned object.
>
> Signed-off-by: Roberto Sassu <roberto.sassu@xxxxxxxxxx>
> ---
> tools/lib/bpf/bpf.c | 8 +++++++-
> tools/lib/bpf/bpf.h | 1 +
> tools/lib/bpf/libbpf.map | 1 +
> 3 files changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/bpf.c b/tools/lib/bpf/bpf.c
> index 33bac2006043..a5fc40f6ce13 100644
> --- a/tools/lib/bpf/bpf.c
> +++ b/tools/lib/bpf/bpf.c
> @@ -670,18 +670,24 @@ int bpf_obj_pin(int fd, const char *pathname)
> return libbpf_err_errno(ret);
> }
>
> -int bpf_obj_get(const char *pathname)
> +int bpf_obj_get_flags(const char *pathname, __u32 flags)
same note about bpf_obj_get_opts() instead
> {
> union bpf_attr attr;
> int fd;
>
> memset(&attr, 0, sizeof(attr));
> attr.pathname = ptr_to_u64((void *)pathname);
> + attr.file_flags = flags;
>
> fd = sys_bpf_fd(BPF_OBJ_GET, &attr, sizeof(attr));
> return libbpf_err_errno(fd);
> }
>
> +int bpf_obj_get(const char *pathname)
> +{
> + return bpf_obj_get_flags(pathname, 0);
> +}
> +
> int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
> unsigned int flags)
> {
> diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
> index 20e4c852362d..6d0ceb2e90c4 100644
> --- a/tools/lib/bpf/bpf.h
> +++ b/tools/lib/bpf/bpf.h
> @@ -339,6 +339,7 @@ LIBBPF_API int bpf_map_update_batch(int fd, const void *keys, const void *values
> const struct bpf_map_batch_opts *opts);
>
> LIBBPF_API int bpf_obj_pin(int fd, const char *pathname);
> +LIBBPF_API int bpf_obj_get_flags(const char *pathname, __u32 flags);
> LIBBPF_API int bpf_obj_get(const char *pathname);
>
> struct bpf_prog_attach_opts {
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 019278e66836..6c3ace12b27b 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -467,6 +467,7 @@ LIBBPF_1.0.0 {
> libbpf_bpf_map_type_str;
> libbpf_bpf_prog_type_str;
> bpf_map_get_fd_by_id_flags;
> + bpf_obj_get_flags;
>
> local: *;
> };
> --
> 2.25.1
>
