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4cf1bc1f10
Similar to bpf_local_storage for sockets and inodes add local storage for task_struct. The life-cycle of storage is managed with the life-cycle of the task_struct. i.e. the storage is destroyed along with the owning task with a callback to the bpf_task_storage_free from the task_free LSM hook. 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. The userspace map operations can be done by using a pid fd as a key passed to the lookup, update and delete operations. Signed-off-by: KP Singh <kpsingh@google.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Song Liu <songliubraving@fb.com> Acked-by: Martin KaFai Lau <kafai@fb.com> Link: https://lore.kernel.org/bpf/20201106103747.2780972-3-kpsingh@chromium.org
34 lines
877 B
C
34 lines
877 B
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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#include <linux/lsm_hooks.h>
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#include <linux/bpf_lsm.h>
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static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
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#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
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LSM_HOOK_INIT(NAME, bpf_lsm_##NAME),
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#include <linux/lsm_hook_defs.h>
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#undef LSM_HOOK
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LSM_HOOK_INIT(inode_free_security, bpf_inode_storage_free),
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LSM_HOOK_INIT(task_free, bpf_task_storage_free),
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};
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static int __init bpf_lsm_init(void)
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{
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security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), "bpf");
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pr_info("LSM support for eBPF active\n");
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return 0;
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}
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struct lsm_blob_sizes bpf_lsm_blob_sizes __lsm_ro_after_init = {
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.lbs_inode = sizeof(struct bpf_storage_blob),
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.lbs_task = sizeof(struct bpf_storage_blob),
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};
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DEFINE_LSM(bpf) = {
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.name = "bpf",
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.init = bpf_lsm_init,
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.blobs = &bpf_lsm_blob_sizes
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};
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