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Commit e16d2f1a authored Jan 31, 2019 by Alexei Starovoitov Committed by Daniel Borkmann Feb 01, 2019

bpf: add support for bpf_spin_lock to cgroup local storage



Allow 'struct bpf_spin_lock' to reside inside cgroup local storage.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

parent d83525ca

kernel/bpf/local_storage.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -147,6 +147,7 @@ static int cgroup_storage_update_elem(struct bpf_map map, void _key,
		return -ENOMEM;

		memcpy(&new->data[0], value, map->value_size);
		check_and_init_map_lock(map, new->data);

		new = xchg(&storage->buf, new);
		kfree_rcu(new, rcu);
		@@ -483,6 +484,7 @@ struct bpf_cgroup_storage bpf_cgroup_storage_alloc(struct bpf_prog prog,
		storage->buf = kmalloc_node(size, flags, map->numa_node);
		if (!storage->buf)
		goto enomem;
		check_and_init_map_lock(map, storage->buf->data);
		} else {
		storage->percpu_buf = __alloc_percpu_gfp(size, 8, flags);
		if (!storage->percpu_buf)

kernel/bpf/syscall.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -482,7 +482,8 @@ static int map_check_btf(struct bpf_map map, const struct btf btf,

		if (map_value_has_spin_lock(map)) {
		if (map->map_type != BPF_MAP_TYPE_HASH &&
		map->map_type != BPF_MAP_TYPE_ARRAY)
		map->map_type != BPF_MAP_TYPE_ARRAY &&
		map->map_type != BPF_MAP_TYPE_CGROUP_STORAGE)
		return -ENOTSUPP;
		if (map->spin_lock_off + sizeof(struct bpf_spin_lock) >
		map->value_size) {

kernel/bpf/verifier.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -3089,6 +3089,8 @@ static int check_helper_call(struct bpf_verifier_env *env, int func_id, int insn
		regs[BPF_REG_0].map_ptr = meta.map_ptr;
		if (fn->ret_type == RET_PTR_TO_MAP_VALUE) {
		regs[BPF_REG_0].type = PTR_TO_MAP_VALUE;
		if (map_value_has_spin_lock(meta.map_ptr))
		regs[BPF_REG_0].id = ++env->id_gen;
		} else {
		regs[BPF_REG_0].type = PTR_TO_MAP_VALUE_OR_NULL;
		regs[BPF_REG_0].id = ++env->id_gen;