linux-kernel - [PATCH 1/3] ima: add error mesage to kexec

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Message-Id: <1542657371-7019-2-git-send-email-zohar@linux.ibm.com>
Date:   Mon, 19 Nov 2018 14:56:09 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     linux-integrity@...r.kernel.org
Cc:     Mimi Zohar <zohar@...ux.ibm.com>,
        linux-security-module@...r.kernel.org, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com,
        jforbes@...hat.com, seth.forshee@...onical.com,
        kexec@...ts.infradead.org, Nayna Jain <nayna@...ux.ibm.com>
Subject: [PATCH 1/3] ima: add error mesage to kexec_load

Reject the kexec_load syscall with some indication of the problem.

Signed-off-by: Mimi Zohar <zohar@...ux.ibm.com>
---
 security/integrity/ima/ima_main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 41e4771980d5..df0b2ee49fa2 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -513,8 +513,10 @@ int ima_load_data(enum kernel_load_data_id id)
 	switch (id) {
 	case LOADING_KEXEC_IMAGE:
 		if (IS_ENABLED(CONFIG_KEXEC_VERIFY_SIG)
-		    && arch_ima_get_secureboot())
+		    && arch_ima_get_secureboot()) {
+			pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n");
 			return -EACCES;
+		}
 
 		if (ima_enforce && (ima_appraise & IMA_APPRAISE_KEXEC)) {
 			pr_err("impossible to appraise a kernel image without a file descriptor; try using kexec_file_load syscall.\n");
-- 
2.7.5