On Tue, Jul 15, 2025 at 3:27 PM Blaise Boscaccy
<bboscaccy@xxxxxxxxxxxxxxxxxxx> wrote:
[...]
> +/**
> + * lsm_bpf_map_alloc - allocate a composite bpf_map blob
> + * @map: the bpf_map that needs a blob
> + *
> + * Allocate the bpf_map blob for all the modules
> + *
> + * Returns 0, or -ENOMEM if memory can't be allocated.
> + */
> +static int lsm_bpf_map_alloc(struct bpf_map *map)
> +{
> + if (blob_sizes.lbs_bpf_map == 0) {
> + map->security = NULL;
> + return 0;
> + }
> +
> + map->security = kzalloc(blob_sizes.lbs_bpf_map, GFP_KERNEL);
> + if (!map->security)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +/**
> + * lsm_bpf_prog_alloc - allocate a composite bpf_prog blob
> + * @prog: the bpf_prog that needs a blob
> + *
> + * Allocate the bpf_prog blob for all the modules
> + *
> + * Returns 0, or -ENOMEM if memory can't be allocated.
> + */
> +static int lsm_bpf_prog_alloc(struct bpf_prog *prog)
> +{
> + if (blob_sizes.lbs_bpf_prog == 0) {
> + prog->aux->security = NULL;
> + return 0;
> + }
> +
> + prog->aux->security = kzalloc(blob_sizes.lbs_bpf_prog, GFP_KERNEL);
> + if (!prog->aux->security)
> + return -ENOMEM;
> +
> + return 0;
> +}
> +
> +/**
> + * lsm_bpf_token_alloc - allocate a composite bpf_token blob
> + * @token: the bpf_token that needs a blob
> + *
> + * Allocate the bpf_token blob for all the modules
> + *
> + * Returns 0, or -ENOMEM if memory can't be allocated.
> + */
> +static int lsm_bpf_token_alloc(struct bpf_token *token)
> +{
> + if (blob_sizes.lbs_bpf_token == 0) {
> + token->security = NULL;
> + return 0;
> + }
> +
> + token->security = kzalloc(blob_sizes.lbs_bpf_token, GFP_KERNEL);
> + if (!token->security)
> + return -ENOMEM;
> +
> + return 0;
> +}
We need the above 3 functions inside #ifdef CONFIG_BPF_SYSCALL.
Also, can we use lsm_blob_alloc() in these functions?
Thanks,
Song
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