mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 12:11:40 +00:00
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
35 lines
877 B
C
35 lines
877 B
C
// SPDX-License-Identifier: GPL-2.0
|
|
|
|
/*
|
|
* Copyright (C) 2020 Google LLC.
|
|
*/
|
|
#include <linux/lsm_hooks.h>
|
|
#include <linux/bpf_lsm.h>
|
|
|
|
static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = {
|
|
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
|
|
LSM_HOOK_INIT(NAME, bpf_lsm_##NAME),
|
|
#include <linux/lsm_hook_defs.h>
|
|
#undef LSM_HOOK
|
|
LSM_HOOK_INIT(inode_free_security, bpf_inode_storage_free),
|
|
LSM_HOOK_INIT(task_free, bpf_task_storage_free),
|
|
};
|
|
|
|
static int __init bpf_lsm_init(void)
|
|
{
|
|
security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), "bpf");
|
|
pr_info("LSM support for eBPF active\n");
|
|
return 0;
|
|
}
|
|
|
|
struct lsm_blob_sizes bpf_lsm_blob_sizes __lsm_ro_after_init = {
|
|
.lbs_inode = sizeof(struct bpf_storage_blob),
|
|
.lbs_task = sizeof(struct bpf_storage_blob),
|
|
};
|
|
|
|
DEFINE_LSM(bpf) = {
|
|
.name = "bpf",
|
|
.init = bpf_lsm_init,
|
|
.blobs = &bpf_lsm_blob_sizes
|
|
};
|