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8ea636848a
Similar to bpf_local_storage for sockets, add local storage for inodes. The life-cycle of storage is managed with the life-cycle of the inode. i.e. the storage is destroyed along with the owning inode. The BPF LSM allocates an __rcu pointer to the bpf_local_storage in the security blob which are now stackable and can co-exist with other LSMs. Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200825182919.1118197-6-kpsingh@chromium.org
63 lines
1.3 KiB
C
63 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020 Google LLC.
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*/
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#ifndef _LINUX_BPF_LSM_H
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#define _LINUX_BPF_LSM_H
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#include <linux/bpf.h>
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#include <linux/lsm_hooks.h>
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#ifdef CONFIG_BPF_LSM
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#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
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RET bpf_lsm_##NAME(__VA_ARGS__);
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#include <linux/lsm_hook_defs.h>
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#undef LSM_HOOK
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struct bpf_storage_blob {
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struct bpf_local_storage __rcu *storage;
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};
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extern struct lsm_blob_sizes bpf_lsm_blob_sizes;
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int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
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const struct bpf_prog *prog);
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static inline struct bpf_storage_blob *bpf_inode(
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const struct inode *inode)
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{
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if (unlikely(!inode->i_security))
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return NULL;
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return inode->i_security + bpf_lsm_blob_sizes.lbs_inode;
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}
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extern const struct bpf_func_proto bpf_inode_storage_get_proto;
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extern const struct bpf_func_proto bpf_inode_storage_delete_proto;
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void bpf_inode_storage_free(struct inode *inode);
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#else /* !CONFIG_BPF_LSM */
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static inline int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
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const struct bpf_prog *prog)
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{
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return -EOPNOTSUPP;
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}
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static inline struct bpf_storage_blob *bpf_inode(
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const struct inode *inode)
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{
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return NULL;
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}
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static inline void bpf_inode_storage_free(struct inode *inode)
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{
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}
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#endif /* CONFIG_BPF_LSM */
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#endif /* _LINUX_BPF_LSM_H */
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