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-rw-r--r--efi-lockdown.patch245
1 files changed, 6 insertions, 239 deletions
diff --git a/efi-lockdown.patch b/efi-lockdown.patch
index 2fbc40e63..a4b602b2a 100644
--- a/efi-lockdown.patch
+++ b/efi-lockdown.patch
@@ -136,9 +136,9 @@ index c4302067a3ad..a68e5bdebad5 100644
+ Makes the lockdown non-negotiable. It is always on and cannot be
+ disabled.
+
- source security/selinux/Kconfig
- source security/smack/Kconfig
- source security/tomoyo/Kconfig
+ source "security/selinux/Kconfig"
+ source "security/smack/Kconfig"
+ source "security/tomoyo/Kconfig"
@@ -278,4 +300,3 @@ config DEFAULT_SECURITY
default "" if DEFAULT_SECURITY_DAC
@@ -447,9 +447,9 @@ index a68e5bdebad5..46967ee77dfd 100644
+ combination on a wired keyboard. On x86, this is SysRq+x.
+
+
- source security/selinux/Kconfig
- source security/smack/Kconfig
- source security/tomoyo/Kconfig
+ source "security/selinux/Kconfig"
+ source "security/smack/Kconfig"
+ source "security/tomoyo/Kconfig"
diff --git a/security/lock_down.c b/security/lock_down.c
index f35ffdd096ad..2615669dbf03 100644
--- a/security/lock_down.c
@@ -518,239 +518,6 @@ index f35ffdd096ad..2615669dbf03 100644
--
2.14.3
-From 2d534703537af95f601d3bdab11ee6ba8b3bc2dc Mon Sep 17 00:00:00 2001
-From: Mimi Zohar <zohar@linux.vnet.ibm.com>
-Date: Mon, 9 Apr 2018 09:52:45 +0100
-Subject: [PATCH 03/24] ima: require secure_boot rules in lockdown mode
-
-Require the "secure_boot" rules, whether or not it is specified
-on the boot command line, for both the builtin and custom policies
-in secure boot lockdown mode.
-
-Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
-Signed-off-by: David Howells <dhowells@redhat.com>
----
- security/integrity/ima/ima_policy.c | 34 +++++++++++++++++++++++------
- 1 file changed, 27 insertions(+), 7 deletions(-)
-
-diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
-index 8c9499867c91..f8428f579924 100644
---- a/security/integrity/ima/ima_policy.c
-+++ b/security/integrity/ima/ima_policy.c
-@@ -481,14 +481,21 @@ static int ima_appraise_flag(enum ima_hooks func)
- */
- void __init ima_init_policy(void)
- {
-- int i, measure_entries, appraise_entries, secure_boot_entries;
-+ int i;
-+ int measure_entries = 0;
-+ int appraise_entries = 0;
-+ int secure_boot_entries = 0;
-+ bool kernel_locked_down = __kernel_is_locked_down(NULL, false);
-
- /* if !ima_policy set entries = 0 so we load NO default rules */
-- measure_entries = ima_policy ? ARRAY_SIZE(dont_measure_rules) : 0;
-- appraise_entries = ima_use_appraise_tcb ?
-- ARRAY_SIZE(default_appraise_rules) : 0;
-- secure_boot_entries = ima_use_secure_boot ?
-- ARRAY_SIZE(secure_boot_rules) : 0;
-+ if (ima_policy)
-+ measure_entries = ARRAY_SIZE(dont_measure_rules);
-+
-+ if (ima_use_appraise_tcb)
-+ appraise_entries = ARRAY_SIZE(default_appraise_rules);
-+
-+ if (ima_use_secure_boot || kernel_locked_down)
-+ secure_boot_entries = ARRAY_SIZE(secure_boot_rules);
-
- for (i = 0; i < measure_entries; i++)
- list_add_tail(&dont_measure_rules[i].list, &ima_default_rules);
-@@ -509,12 +516,25 @@ void __init ima_init_policy(void)
-
- /*
- * Insert the builtin "secure_boot" policy rules requiring file
-- * signatures, prior to any other appraise rules.
-+ * signatures, prior to any other appraise rules. In secure boot
-+ * lock-down mode, also require these appraise rules for custom
-+ * policies.
- */
- for (i = 0; i < secure_boot_entries; i++) {
-+ struct ima_rule_entry *entry;
-+
-+ /* Include for builtin policies */
- list_add_tail(&secure_boot_rules[i].list, &ima_default_rules);
- temp_ima_appraise |=
- ima_appraise_flag(secure_boot_rules[i].func);
-+
-+ /* Include for custom policies */
-+ if (kernel_locked_down) {
-+ entry = kmemdup(&secure_boot_rules[i], sizeof(*entry),
-+ GFP_KERNEL);
-+ if (entry)
-+ list_add_tail(&entry->list, &ima_policy_rules);
-+ }
- }
-
- /*
---
-2.17.1
-
-From 980a380dc973c5a7745e4833aba368637a99df2e Mon Sep 17 00:00:00 2001
-From: David Howells <dhowells@redhat.com>
-Date: Mon, 9 Apr 2018 09:52:46 +0100
-Subject: [PATCH] Enforce module signatures if the kernel is locked down
-
-If the kernel is locked down, require that all modules have valid
-signatures that we can verify or that IMA can validate the file.
-
-I have adjusted the errors generated:
-
- (1) If there's no signature (ENODATA) or we can't check it (ENOPKG,
- ENOKEY), then:
-
- (a) If signatures are enforced then EKEYREJECTED is returned.
-
- (b) If IMA will have validated the image, return 0 (okay).
-
- (c) If there's no signature or we can't check it, but the kernel is
- locked down then EPERM is returned (this is then consistent with
- other lockdown cases).
-
- (2) If the signature is unparseable (EBADMSG, EINVAL), the signature fails
- the check (EKEYREJECTED) or a system error occurs (eg. ENOMEM), we
- return the error we got.
-
-Note that the X.509 code doesn't check for key expiry as the RTC might not
-be valid or might not have been transferred to the kernel's clock yet.
-
-Signed-off-by: David Howells <dhowells@redhat.com>
-Reviewed-by: Jiri Bohac <jbohac@suse.cz>
-cc: "Lee, Chun-Yi" <jlee@suse.com>
-cc: James Morris <james.l.morris@oracle.com>
----
- kernel/module.c | 56 +++++++++++++++++++++++++++++++++++++------------
- 1 file changed, 43 insertions(+), 13 deletions(-)
-
-diff --git a/kernel/module.c b/kernel/module.c
-index b046a32520d8..3bb0722c106e 100644
---- a/kernel/module.c
-+++ b/kernel/module.c
-@@ -64,6 +64,7 @@
- #include <linux/bsearch.h>
- #include <linux/dynamic_debug.h>
- #include <linux/audit.h>
-+#include <linux/ima.h>
- #include <uapi/linux/module.h>
- #include "module-internal.h"
-
-@@ -2741,10 +2742,12 @@ static inline void kmemleak_load_module(const struct module *mod,
- #endif
-
- #ifdef CONFIG_MODULE_SIG
--static int module_sig_check(struct load_info *info, int flags)
-+static int module_sig_check(struct load_info *info, int flags,
-+ bool can_do_ima_check)
- {
-- int err = -ENOKEY;
-+ int err = -ENODATA;
- const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1;
-+ const char *reason;
- const void *mod = info->hdr;
-
- /*
-@@ -2759,19 +2762,46 @@ static int module_sig_check(struct load_info *info, int flags)
- err = mod_verify_sig(mod, info);
- }
-
-- if (!err) {
-+ switch (err) {
-+ case 0:
- info->sig_ok = true;
- return 0;
-- }
-
-- /* Not having a signature is only an error if we're strict. */
-- if (err == -ENOKEY && !is_module_sig_enforced())
-- err = 0;
-+ /* We don't permit modules to be loaded into trusted kernels
-+ * without a valid signature on them, but if we're not
-+ * enforcing, certain errors are non-fatal.
-+ */
-+ case -ENODATA:
-+ reason = "Loading of unsigned module";
-+ goto decide;
-+ case -ENOPKG:
-+ reason = "Loading of module with unsupported crypto";
-+ goto decide;
-+ case -ENOKEY:
-+ reason = "Loading of module with unavailable key";
-+ decide:
-+ if (sig_enforce) {
-+ pr_notice("%s is rejected\n", reason);
-+ return -EKEYREJECTED;
-+ }
-
-- return err;
-+ if (can_do_ima_check && is_ima_appraise_enabled())
-+ return 0;
-+ if (kernel_is_locked_down(reason))
-+ return -EPERM;
-+ return 0;
-+
-+ /* All other errors are fatal, including nomem, unparseable
-+ * signatures and signature check failures - even if signatures
-+ * aren't required.
-+ */
-+ default:
-+ return err;
-+ }
- }
- #else /* !CONFIG_MODULE_SIG */
--static int module_sig_check(struct load_info *info, int flags)
-+static int module_sig_check(struct load_info *info, int flags,
-+ bool can_do_ima_check)
- {
- return 0;
- }
-@@ -3620,7 +3650,7 @@ static int unknown_module_param_cb(char *param, char *val, const char *modname,
- /* Allocate and load the module: note that size of section 0 is always
- zero, and we rely on this for optional sections. */
- static int load_module(struct load_info *info, const char __user *uargs,
-- int flags)
-+ int flags, bool can_do_ima_check)
- {
- struct module *mod;
- long err = 0;
-@@ -3639,7 +3669,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
- goto free_copy;
- }
-
-- err = module_sig_check(info, flags);
-+ err = module_sig_check(info, flags, can_do_ima_check);
- if (err)
- goto free_copy;
-
-@@ -3834,7 +3864,7 @@ SYSCALL_DEFINE3(init_module, void __user *, umod,
- if (err)
- return err;
-
-- return load_module(&info, uargs, 0);
-+ return load_module(&info, uargs, 0, false);
- }
-
- SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
-@@ -3861,7 +3891,7 @@ SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
- info.hdr = hdr;
- info.len = size;
-
-- return load_module(&info, uargs, flags);
-+ return load_module(&info, uargs, flags, true);
- }
-
- static inline int within(unsigned long addr, void *start, unsigned long size)
---
-2.17.1
-
From 7948946e19294e7560c81b177b2788d21ed79f59 Mon Sep 17 00:00:00 2001
From: Matthew Garrett <mjg59@srcf.ucam.org>
Date: Mon, 9 Apr 2018 09:52:46 +0100
generated by cgit (git 2.34.1) at 2024-05-20 11:15:44 +0000