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bpf: lsm: Initialize the BPF LSM hooks

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* The hooks are initialized using the definitions in
  include/linux/lsm_hook_defs.h.
* The LSM can be enabled / disabled with CONFIG_BPF_LSM.

Signed-off-by: KP Singh <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Reviewed-by: Brendan Jackman <[email protected]>
Reviewed-by: Florent Revest <[email protected]>
Acked-by: Kees Cook <[email protected]>
Acked-by: James Morris <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
This commit is contained in:
KP Singh authored and Daniel Borkmann committed 2020-03-30 01:34:00 +02:00
1 parent 9e4e01dfd3
commit 520b7aa00d
4 files changed
+38 -5
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security/Kconfig
+5 -5
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@@ -277,11 +277,11 @@ endchoice
config LSM
string "Ordered list of enabled LSMs"
default "lockdown,yama,loadpin,safesetid,integrity,smack,selinux,tomoyo,apparmor" if DEFAULT_SECURITY_SMACK
default "lockdown,yama,loadpin,safesetid,integrity,apparmor,selinux,smack,tomoyo" if DEFAULT_SECURITY_APPARMOR
default "lockdown,yama,loadpin,safesetid,integrity,tomoyo" if DEFAULT_SECURITY_TOMOYO
default "lockdown,yama,loadpin,safesetid,integrity" if DEFAULT_SECURITY_DAC
default "lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor"
default "lockdown,yama,loadpin,safesetid,integrity,smack,selinux,tomoyo,apparmor,bpf" if DEFAULT_SECURITY_SMACK
default "lockdown,yama,loadpin,safesetid,integrity,apparmor,selinux,smack,tomoyo,bpf" if DEFAULT_SECURITY_APPARMOR
default "lockdown,yama,loadpin,safesetid,integrity,tomoyo,bpf" if DEFAULT_SECURITY_TOMOYO
default "lockdown,yama,loadpin,safesetid,integrity,bpf" if DEFAULT_SECURITY_DAC
default "lockdown,yama,loadpin,safesetid,integrity,selinux,smack,tomoyo,apparmor,bpf"
help
A comma-separated list of LSMs, in initialization order.
Any LSMs left off this list will be ignored. This can be
security/Makefile
+2
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@@ -12,6 +12,7 @@ subdir-$(CONFIG_SECURITY_YAMA) += yama
subdir-$(CONFIG_SECURITY_LOADPIN) += loadpin
subdir-$(CONFIG_SECURITY_SAFESETID) += safesetid
subdir-$(CONFIG_SECURITY_LOCKDOWN_LSM) += lockdown
subdir-$(CONFIG_BPF_LSM) += bpf
# always enable default capabilities
obj-y += commoncap.o
@@ -30,6 +31,7 @@ obj-$(CONFIG_SECURITY_LOADPIN) += loadpin/
obj-$(CONFIG_SECURITY_SAFESETID) += safesetid/
obj-$(CONFIG_SECURITY_LOCKDOWN_LSM) += lockdown/
obj-$(CONFIG_CGROUP_DEVICE) += device_cgroup.o
obj-$(CONFIG_BPF_LSM) += bpf/
# Object integrity file lists
subdir-$(CONFIG_INTEGRITY) += integrity
security/bpf/Makefile
+5
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@@ -0,0 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
#
# Copyright (C) 2020 Google LLC.
obj-$(CONFIG_BPF_LSM) := hooks.o
security/bpf/hooks.c
+26
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@@ -0,0 +1,26 @@
// 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
};
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;
}
DEFINE_LSM(bpf) = {
.name = "bpf",
.init = bpf_lsm_init,
};