linux-kernel - [RFC][PATCH v2 21/29] kernel/configs: Register dynamic information into Kmemdump

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Message-ID: <20250724135512.518487-22-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:04 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	tglx@...utronix.de,
	andersson@...nel.org,
	pmladek@...e.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org,
	eugen.hristev@...aro.org,
	corbet@....net,
	mojha@....qualcomm.com,
	rostedt@...dmis.org,
	jonechou@...gle.com,
	tudor.ambarus@...aro.org
Subject: [RFC][PATCH v2 21/29] kernel/configs: Register dynamic information into Kmemdump

Register kernel_config_data information into kmemdump.
Debugging tools look for the start and end markers, so we need to capture
those as well into the region.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 kernel/configs.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/configs.c b/kernel/configs.c
index a28c79c5f713..ec94b695f234 100644
--- a/kernel/configs.c
+++ b/kernel/configs.c
@@ -15,6 +15,7 @@
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/uaccess.h>
+#include <linux/kmemdump.h>
 
 /*
  * "IKCFG_ST" and "IKCFG_ED" are used to extract the config data from
@@ -64,6 +65,11 @@ static int __init ikconfig_init(void)
 
 	proc_set_size(entry, &kernel_config_data_end - &kernel_config_data);
 
+	/* Register 8 bytes before and after, to catch the marker too */
+	kmemdump_register_id(KMEMDUMP_ID_COREIMAGE_CONFIG,
+			     (void *)&kernel_config_data - 8,
+			     &kernel_config_data_end - &kernel_config_data + 16);
+
 	return 0;
 }
 
-- 
2.43.0