bpf: lsm: Set bpf_lsm_blob_sizes.lbs_task to 0

bpf task local storage is now using task_struct->bpf_storage, so
bpf_lsm_blob_sizes.lbs_task is no longer needed. Remove it to save some
memory.

Fixes: a10787e ("bpf: Enable task local storage for tracing programs")
Cc: [email protected]
Cc: KP Singh <[email protected]>
Cc: Matt Bobrowski <[email protected]>
Signed-off-by: Song Liu <[email protected]>
Acked-by: Matt Bobrowski <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Alexei Starovoitov <[email protected]>

Author: liu-song-6

security/bpf/hooks.c

@@ -31,7 +31,6 @@ static int __init bpf_lsm_init(void)
 
 struct lsm_blob_sizes bpf_lsm_blob_sizes __ro_after_init = {
 	.lbs_inode = sizeof(struct bpf_storage_blob),
-	.lbs_task = sizeof(struct bpf_storage_blob),
 };
 
 DEFINE_LSM(bpf) = {