linux-kernel - [PATCH v4a 1/2] selftests/kexec: make tests independent of IMA being enabled

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Message-Id: <1553283351-6310-1-git-send-email-zohar@linux.ibm.com>
Date:   Fri, 22 Mar 2019 15:35:50 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     linux-kselftest@...r.kernel.org, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Petr Vorel <pvorel@...e.cz>,
        Dave Young <dyoung@...hat.com>,
        Matthew Garrett <mjg59@...gle.com>,
        Mimi Zohar <zohar@...ux.ibm.com>
Subject: [PATCH v4a 1/2] selftests/kexec: make tests independent of IMA being enabled

Verify IMA is enabled before failing tests or emitting irrelevant
messages.  Also, don't skip the test if signatures are not required.

Suggested-by: Dave Young <dyoung@...hat.com>
Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
---
Dave, if this patch resolves the outstanding issues, I can fold these
changes into the original patches. (Reminder, these patches will need to
be updated to support the "lockdown" patch set.)

 .../selftests/kexec/test_kexec_file_load.sh        | 27 ++++++++++++++--------
 tools/testing/selftests/kexec/test_kexec_load.sh   | 24 ++++++++++++-------
 2 files changed, 33 insertions(+), 18 deletions(-)

diff --git a/tools/testing/selftests/kexec/test_kexec_file_load.sh b/tools/testing/selftests/kexec/test_kexec_file_load.sh
index 1d2e5e799523..57b636792086 100755
--- a/tools/testing/selftests/kexec/test_kexec_file_load.sh
+++ b/tools/testing/selftests/kexec/test_kexec_file_load.sh
@@ -110,11 +110,20 @@ kexec_file_load_test()
 			log_fail "$succeed_msg (missing IMA sig)"
 		fi
 
-		if [ $pe_sig_required -eq 0 ] && [ $ima_sig_required -eq 0 ] \
-		    && [ $ima_read_policy -eq 0 ] && [ $ima_signed -eq 0 ]; then
+		if [ $pe_sig_required -eq 0 ] && [ $ima_appraise -eq 1 ] \
+		    && [ $ima_sig_required -eq 0 ] && [ $ima_signed -eq 0 ] \
+	            && [ $ima_read_policy -eq 0 ]; then
 			log_fail "$succeed_msg (possibly missing IMA sig)"
 		fi
 
+		if [ $pe_sig_required -eq 0 ] && [ $ima_appraise -eq 0 ]; then
+			log_info "No signature verification required"
+		elif [ $pe_sig_required -eq 0 ] && [ $ima_appraise -eq 1 ] \
+		    && [ $ima_sig_required -eq 0 ] && [ $ima_signed -eq 0 ] \
+	            && [ $ima_read_policy -eq 1 ]; then
+			log_info "No signature verification required"
+		fi
+
 		log_pass "$succeed_msg"
 	fi
 
@@ -136,8 +145,9 @@ kexec_file_load_test()
 		log_pass "$failed_msg (missing IMA sig)"
 	fi
 
-	if [ $pe_sig_required -eq 0 ] && [ $ima_sig_required -eq 0 ] \
-	    && [ $ima_read_policy -eq 0 ] && [ $ima_signed -eq 0 ]; then
+	if [ $pe_sig_required -eq 0 ] && [ $ima_appraise -eq 1 ] \
+	    && [ $ima_sig_required -eq 0 ] && [ $ima_read_policy -eq 0 ] \
+	    && [ $ima_signed -eq 0 ]; then
 		log_pass "$failed_msg (possibly missing IMA sig)"
 	fi
 
@@ -157,6 +167,9 @@ if [ $? -eq 0 ]; then
 fi
 
 # Determine which kernel config options are enabled
+kconfig_enabled "CONFIG_IMA_APPRAISE=y" "IMA enabled"
+ima_appraise=$?
+
 kconfig_enabled "CONFIG_IMA_ARCH_POLICY=y" \
 	"architecture specific policy enabled"
 arch_policy=$?
@@ -178,12 +191,6 @@ ima_sig_required=$?
 get_secureboot_mode
 secureboot=$?
 
-if [ $secureboot -eq 0 ] && [ $arch_policy -eq 0 ] && \
-   [ $pe_sig_required -eq 0 ] && [ $ima_sig_required -eq 0 ] && \
-   [ $ima_read_policy -eq 1 ]; then
-	log_skip "No signature verification required"
-fi
-
 # Are there pe and ima signatures
 check_for_pesig
 pe_signed=$?
diff --git a/tools/testing/selftests/kexec/test_kexec_load.sh b/tools/testing/selftests/kexec/test_kexec_load.sh
index 2a66c8897f55..49c6aa929137 100755
--- a/tools/testing/selftests/kexec/test_kexec_load.sh
+++ b/tools/testing/selftests/kexec/test_kexec_load.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
 # SPDX-License-Identifier: GPL-2.0
-# Loading a kernel image via the kexec_load syscall should fail
-# when the kernel is CONFIG_KEXEC_VERIFY_SIG enabled and the system
-# is booted in secureboot mode.
+#
+# Prevent loading a kernel image via the kexec_load syscall when
+# signatures are required.  (Dependent on CONFIG_IMA_ARCH_POLICY.)
 
 TEST="$0"
 . ./kexec_common_lib.sh
@@ -18,20 +18,28 @@ if [ $? -eq 0 ]; then
 	log_skip "kexec_load is not enabled"
 fi
 
+kconfig_enabled "CONFIG_IMA_APPRAISE=y" "IMA enabled"
+ima_appraise=$?
+
+kconfig_enabled "CONFIG_IMA_ARCH_POLICY=y" \
+	"IMA architecture specific policy enabled"
+arch_policy=$?
+
 get_secureboot_mode
 secureboot=$?
 
-# kexec_load should fail in secure boot mode
+# kexec_load should fail in secure boot mode and CONFIG_IMA_ARCH_POLICY enabled
 kexec --load $KERNEL_IMAGE > /dev/null 2>&1
 if [ $? -eq 0 ]; then
 	kexec --unload
-	if [ $secureboot -eq 1 ]; then
+	if [ $secureboot -eq 1 ] && [ $arch_policy -eq 1 ]; then
 		log_fail "kexec_load succeeded"
-	else
-		log_pass "kexec_load succeeded"
+	elif [ $ima_appraise -eq 0 -o $arch_policy -eq 0 ]; then
+		log_info "Either IMA or the IMA arch policy is not enabled"
 	fi
+	log_pass "kexec_load succeeded"
 else
-	if [ $secureboot -eq 1 ]; then
+	if [ $secureboot -eq 1 ] && [ $arch_policy -eq 1 ] ; then
 		log_pass "kexec_load failed"
 	else
 		log_fail "kexec_load failed"
-- 
2.7.5