linux-kernel - [PATCH] ima: Kdump kernel doesn't need IMA to do integrity measurement

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <20250502200337.6293-1-chenste@linux.microsoft.com>
Date: Fri,  2 May 2025 13:03:37 -0700
From: steven chen <chenste@...ux.microsoft.com>
To: zohar@...ux.ibm.com,
	stefanb@...ux.ibm.com,
	roberto.sassu@...weicloud.com,
	roberto.sassu@...wei.com,
	eric.snowberg@...cle.com,
	ebiederm@...ssion.com,
	paul@...l-moore.com,
	code@...icks.com,
	bauermann@...abnow.com,
	linux-integrity@...r.kernel.org,
	kexec@...ts.infradead.org,
	linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: madvenka@...ux.microsoft.com,
	nramas@...ux.microsoft.com,
	James.Bottomley@...senPartnership.com,
	bhe@...hat.com
Subject: [PATCH] ima: Kdump kernel doesn't need IMA to do integrity measurement

From: Steven Chen <chenste@...ux.microsoft.com>

Kdump kernel doesn't need IMA to do integrity measurement.
Hence the measurement list in 1st kernel doesn't need to be copied to
kdump kenrel.

Here skip allocating buffer for measurement list copying if loading
kdump kernel. Then there won't be the later handling related to
ima_kexec_buffer.

Signed-off-by: Steven Chen <chenste@...ux.microsoft.com>
---
 security/integrity/ima/ima_kexec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c
index 38cb2500f4c3..7362f68f2d8b 100644
--- a/security/integrity/ima/ima_kexec.c
+++ b/security/integrity/ima/ima_kexec.c
@@ -146,6 +146,9 @@ void ima_add_kexec_buffer(struct kimage *image)
 	void *kexec_buffer = NULL;
 	int ret;
 
+	if (image->type == KEXEC_TYPE_CRASH)
+		return;
+
 	/*
 	 * Reserve extra memory for measurements added during kexec.
 	 */
-- 
2.43.0