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Message-Id: <20181002005505.6112-33-keescook@chromium.org>
Date: Mon, 1 Oct 2018 17:55:05 -0700
From: Kees Cook <keescook@...omium.org>
To: James Morris <jmorris@...ei.org>
Cc: Kees Cook <keescook@...omium.org>,
Casey Schaufler <casey@...aufler-ca.com>,
John Johansen <john.johansen@...onical.com>,
Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
Paul Moore <paul@...l-moore.com>,
Stephen Smalley <sds@...ho.nsa.gov>,
"Schaufler, Casey" <casey.schaufler@...el.com>,
LSM <linux-security-module@...r.kernel.org>,
Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org,
linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH security-next v4 32/32] LSM: Add all exclusive LSMs to ordered initialization
This removes CONFIG_DEFAULT_SECURITY in favor of the explicit build-time
ordering offered by CONFIG_LSM_ORDER, and adds all the exclusive LSMs to
the ordered LSM initialization. The old meaning of CONFIG_DEFAULT_SECURITY
is now captured by which exclusive LSM is listed first in the LSM order.
Signed-off-by: Kees Cook <keescook@...omium.org>
Reviewed-by: Casey Schaufler <casey@...aufler-ca.com>
---
security/Kconfig | 43 ++++---------------------------------------
security/security.c | 23 +----------------------
2 files changed, 5 insertions(+), 61 deletions(-)
diff --git a/security/Kconfig b/security/Kconfig
index c459d2b4c7bd..cc8bb1c344f5 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -239,43 +239,6 @@ source security/yama/Kconfig
source security/integrity/Kconfig
-choice
- prompt "Default security module"
- default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
- default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
- default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
- default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
- default DEFAULT_SECURITY_DAC
-
- help
- Select the security module that will be used by default if the
- kernel parameter security= is not specified.
-
- config DEFAULT_SECURITY_SELINUX
- bool "SELinux" if SECURITY_SELINUX=y
-
- config DEFAULT_SECURITY_SMACK
- bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
-
- config DEFAULT_SECURITY_TOMOYO
- bool "TOMOYO" if SECURITY_TOMOYO=y
-
- config DEFAULT_SECURITY_APPARMOR
- bool "AppArmor" if SECURITY_APPARMOR=y
-
- config DEFAULT_SECURITY_DAC
- bool "Unix Discretionary Access Controls"
-
-endchoice
-
-config DEFAULT_SECURITY
- string
- default "selinux" if DEFAULT_SECURITY_SELINUX
- default "smack" if DEFAULT_SECURITY_SMACK
- default "tomoyo" if DEFAULT_SECURITY_TOMOYO
- default "apparmor" if DEFAULT_SECURITY_APPARMOR
- default "" if DEFAULT_SECURITY_DAC
-
config LSM_ENABLE
string "LSMs to enable at boot time"
default "all"
@@ -293,12 +256,14 @@ config LSM_ENABLE
config LSM_ORDER
string "Default initialization order of builtin LSMs"
- default "yama,loadpin,integrity"
+ default "yama,loadpin,integrity,selinux,smack,tomoyo,apparmor"
help
A comma-separated list of LSMs, in initialization order.
Any LSMs left off this list will be link-order initialized
after any listed LSMs. Any LSMs listed here but not built in
- the kernel will be ignored.
+ the kernel will be ignored. If the boot parameter
+ "lsm.order=" is used, it will override this order, with any
+ unlisted LSMs falling back to the order of this config, etc.
If unsure, leave this as the default.
diff --git a/security/security.c b/security/security.c
index 7d542e78b7e8..d682342b6450 100644
--- a/security/security.c
+++ b/security/security.c
@@ -146,7 +146,6 @@ static void __init parse_lsm_order(const char *order, const char *origin)
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
if (lsm->order == LSM_ORDER_MUTABLE &&
- (lsm->flags & LSM_FLAG_LEGACY_MAJOR) == 0 &&
strcmp(lsm->name, name) == 0) {
append_ordered_lsm(lsm, origin);
found = true;
@@ -178,8 +177,7 @@ static void __init prepare_lsm_order(void)
/* Add any missing LSMs, in link order. */
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
- if (lsm->order == LSM_ORDER_MUTABLE &&
- (lsm->flags & LSM_FLAG_LEGACY_MAJOR) == 0)
+ if (lsm->order == LSM_ORDER_MUTABLE)
append_ordered_lsm(lsm, "link-time");
}
@@ -237,18 +235,6 @@ static void __init ordered_lsm_init(void)
maybe_initialize_lsm(*lsm);
}
-static void __init major_lsm_init(void)
-{
- struct lsm_info *lsm;
-
- for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
- if ((lsm->flags & LSM_FLAG_LEGACY_MAJOR) == 0)
- continue;
-
- maybe_initialize_lsm(lsm);
- }
-}
-
static void __init parse_lsm_enable(const char *str,
bool enabled)
{
@@ -282,8 +268,6 @@ static void __init prepare_lsm_enable(void)
parse_lsm_enable(chosen_lsm_disable, false);
/* Process "security=", if given. */
- if (!chosen_major_lsm)
- chosen_major_lsm = CONFIG_DEFAULT_SECURITY;
if (chosen_major_lsm) {
struct lsm_info *lsm;
@@ -326,11 +310,6 @@ int __init security_init(void)
prepare_lsm_order();
ordered_lsm_init();
- /*
- * Load all the remaining security modules.
- */
- major_lsm_init();
-
kfree(ordered_lsms);
return 0;
}
--
2.17.1
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