From: Kees Cook <keescook@chromium.org>
To: James Morris <jmorris@namei.org>
Cc: Kees Cook <keescook@chromium.org>,
Casey Schaufler <casey@schaufler-ca.com>,
John Johansen <john.johansen@canonical.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Paul Moore <paul@paul-moore.com>,
Stephen Smalley <sds@tycho.nsa.gov>,
"Schaufler, Casey" <casey.schaufler@intel.com>,
LSM <linux-security-module@vger.kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
linux-doc@vger.kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH security-next v2 19/26] LSM: Introduce CONFIG_LSM_ORDER
Date: Thu, 20 Sep 2018 09:23:31 -0700 [thread overview]
Message-ID: <20180920162338.21060-20-keescook@chromium.org> (raw)
In-Reply-To: <20180920162338.21060-1-keescook@chromium.org>
This provides a way to declare LSM initialization order via Kconfig.
Signed-off-by: Kees Cook <keescook@chromium.org>
---
security/Kconfig | 11 +++++++++++
security/security.c | 38 +++++++++++++++++++++++++++++++++++---
2 files changed, 46 insertions(+), 3 deletions(-)
diff --git a/security/Kconfig b/security/Kconfig
index 27d8b2688f75..de8202886c1d 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -276,5 +276,16 @@ config DEFAULT_SECURITY
default "apparmor" if DEFAULT_SECURITY_APPARMOR
default "" if DEFAULT_SECURITY_DAC
+config LSM_ORDER
+ string "Default initialization order of builtin LSMs"
+ default "integrity"
+ 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.
+
+ If unsure, leave this as the default.
+
endmenu
diff --git a/security/security.c b/security/security.c
index 2541a512a0f7..063ee2466e58 100644
--- a/security/security.c
+++ b/security/security.c
@@ -44,6 +44,8 @@ char *lsm_names;
/* Boot-time LSM user choice */
static __initdata const char *chosen_major_lsm;
+static __initconst const char * const builtin_lsm_order = CONFIG_LSM_ORDER;
+
/* Ordered list of LSMs to initialize. */
static __initdata struct lsm_info **ordered_lsms;
@@ -108,14 +110,44 @@ static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
(!lsm->enabled || *lsm->enabled) ? "en" : "dis");
}
-/* Populate ordered LSMs list from hard-coded list of LSMs. */
+/* Populate ordered LSMs list from given string. */
+static void __init parse_lsm_order(const char *order, const char *origin)
+{
+ struct lsm_info *lsm;
+ char *sep, *name, *next;
+
+ sep = kstrdup(order, GFP_KERNEL);
+ next = sep;
+ /* Walk the list, looking for matching LSMs. */
+ while ((name = strsep(&next, ",")) != NULL) {
+ bool found = false;
+
+ for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
+ if ((lsm->flags & LSM_FLAG_LEGACY_MAJOR) == 0 &&
+ strcmp(lsm->name, name) == 0) {
+ append_ordered_lsm(lsm, origin);
+ found = true;
+ }
+ }
+
+ if (!found)
+ init_debug("%s ignored: %s\n", origin, name);
+ }
+ kfree(sep);
+}
+
+/* Populate ordered LSMs list from builtin list of LSMs. */
static void __init prepare_lsm_order(void)
{
struct lsm_info *lsm;
+ /* Parse order from builtin list. */
+ parse_lsm_order(builtin_lsm_order, "builtin");
+
+ /* Add any missing LSMs, in link order. */
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
- if (strcmp(lsm->name, "integrity") == 0)
- append_ordered_lsm(lsm, "builtin");
+ if ((lsm->flags & LSM_FLAG_LEGACY_MAJOR) == 0)
+ append_ordered_lsm(lsm, "link-time");
}
}
--
2.17.1
next prev parent reply other threads:[~2018-09-20 16:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-20 16:23 [PATCH security-next v2 00/26] LSM: Explict LSM ordering Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 01/26] LSM: Correctly announce start of LSM initialization Kees Cook
2018-09-20 23:39 ` Casey Schaufler
2018-09-20 16:23 ` [PATCH security-next v2 02/26] vmlinux.lds.h: Avoid copy/paste of security_init section Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 03/26] LSM: Rename .security_initcall section to .lsm_info Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 04/26] LSM: Remove initcall tracing Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 05/26] LSM: Convert from initcall to struct lsm_info Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 06/26] vmlinux.lds.h: Move LSM_TABLE into INIT_DATA Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 07/26] LSM: Convert security_initcall() into DEFINE_LSM() Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 08/26] LSM: Record LSM name in struct lsm_info Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 09/26] LSM: Provide init debugging infrastructure Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 10/26] LSM: Don't ignore initialization failures Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 11/26] LSM: Introduce LSM_FLAG_LEGACY_MAJOR Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 12/26] LSM: Provide separate ordered initialization Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 13/26] LSM: Plumb visibility into optional "enabled" state Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 14/26] LSM: Lift LSM selection out of individual LSMs Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 15/26] LSM: Introduce lsm.enable= and lsm.disable= Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 16/26] LSM: Prepare for reorganizing "security=" logic Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 17/26] LSM: Refactor "security=" in terms of enable/disable Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 18/26] LSM: Build ordered list of ordered LSMs for init Kees Cook
2018-09-21 0:04 ` Casey Schaufler
2018-09-21 0:37 ` Kees Cook
2018-09-20 16:23 ` Kees Cook [this message]
2018-09-21 0:10 ` [PATCH security-next v2 19/26] LSM: Introduce CONFIG_LSM_ORDER Casey Schaufler
2018-09-21 0:14 ` Casey Schaufler
2018-09-20 16:23 ` [PATCH security-next v2 20/26] LSM: Introduce "lsm.order=" for boottime ordering Kees Cook
2018-09-21 0:12 ` Casey Schaufler
2018-09-21 0:40 ` Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 21/26] LoadPin: Initialize as ordered LSM Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 22/26] Yama: " Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 23/26] LSM: Introduce enum lsm_order Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 24/26] capability: Mark as LSM_ORDER_FIRST Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 25/26] LSM: Separate idea of "major" LSM from "exclusive" LSM Kees Cook
2018-09-20 16:23 ` [PATCH security-next v2 26/26] LSM: Add all exclusive LSMs to ordered initialization Kees Cook
2018-09-21 0:25 ` Casey Schaufler
2018-09-21 0:45 ` Kees Cook
2018-09-21 1:10 ` Casey Schaufler
2018-09-21 1:39 ` John Johansen
2018-09-21 2:05 ` Kees Cook
2018-09-21 2:14 ` John Johansen
2018-09-21 3:02 ` Kees Cook
2018-09-21 13:19 ` John Johansen
2018-09-21 14:57 ` Casey Schaufler
2018-09-20 20:14 ` [PATCH security-next v2 00/26] LSM: Explict LSM ordering Martin Steigerwald
2018-09-20 21:55 ` Kees Cook
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