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Tip revision: f8394f232b1eab649ce2df5c5f15b0e528c92091 authored by Linus Torvalds on 09 November 2020, 00:10:16 UTC
Linux 5.10-rc3
Linux 5.10-rc3
Tip revision: f8394f2
bpf_lsm.c
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Google LLC.
*/
#include <linux/filter.h>
#include <linux/bpf.h>
#include <linux/btf.h>
#include <linux/lsm_hooks.h>
#include <linux/bpf_lsm.h>
#include <linux/kallsyms.h>
#include <linux/bpf_verifier.h>
#include <net/bpf_sk_storage.h>
#include <linux/bpf_local_storage.h>
/* For every LSM hook that allows attachment of BPF programs, declare a nop
* function where a BPF program can be attached.
*/
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
noinline RET bpf_lsm_##NAME(__VA_ARGS__) \
{ \
return DEFAULT; \
}
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
#define BPF_LSM_SYM_PREFX "bpf_lsm_"
int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog,
const struct bpf_prog *prog)
{
if (!prog->gpl_compatible) {
bpf_log(vlog,
"LSM programs must have a GPL compatible license\n");
return -EINVAL;
}
if (strncmp(BPF_LSM_SYM_PREFX, prog->aux->attach_func_name,
sizeof(BPF_LSM_SYM_PREFX) - 1)) {
bpf_log(vlog, "attach_btf_id %u points to wrong type name %s\n",
prog->aux->attach_btf_id, prog->aux->attach_func_name);
return -EINVAL;
}
return 0;
}
static const struct bpf_func_proto *
bpf_lsm_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
{
switch (func_id) {
case BPF_FUNC_inode_storage_get:
return &bpf_inode_storage_get_proto;
case BPF_FUNC_inode_storage_delete:
return &bpf_inode_storage_delete_proto;
case BPF_FUNC_sk_storage_get:
return &bpf_sk_storage_get_proto;
case BPF_FUNC_sk_storage_delete:
return &bpf_sk_storage_delete_proto;
default:
return tracing_prog_func_proto(func_id, prog);
}
}
const struct bpf_prog_ops lsm_prog_ops = {
};
const struct bpf_verifier_ops lsm_verifier_ops = {
.get_func_proto = bpf_lsm_func_proto,
.is_valid_access = btf_ctx_access,
};