linux-hardening - [RFC][PATCH v2 28/29] mm/init-mm: Annotate additional information into Kmemdump

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Message-ID: <20250724135512.518487-29-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:11 +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 28/29] mm/init-mm: Annotate additional information into Kmemdump

Annotate additional static information into kmemdump:
 - _sinittext
 - _einittext
 - _end
 - _text
 - _stext
 - _etext
 - swapper_pg_dir

Information on these variables is stored into dedicated kmemdump section.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 mm/init-mm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/mm/init-mm.c b/mm/init-mm.c
index 2dbbaf640cf4..01ff91f35b23 100644
--- a/mm/init-mm.c
+++ b/mm/init-mm.c
@@ -20,6 +20,13 @@
 
 const struct vm_operations_struct vma_dummy_vm_ops;
 
+KMEMDUMP_VAR_CORE(_sinittext, sizeof(void *));
+KMEMDUMP_VAR_CORE(_einittext, sizeof(void *));
+KMEMDUMP_VAR_CORE(_end, sizeof(void *));
+KMEMDUMP_VAR_CORE(_text, sizeof(void *));
+KMEMDUMP_VAR_CORE(_stext, sizeof(void *));
+KMEMDUMP_VAR_CORE(_etext, sizeof(void *));
+
 /*
  * For dynamically allocated mm_structs, there is a dynamically sized cpumask
  * at the end of the structure, the size of which depends on the maximum CPU
@@ -51,6 +58,7 @@ struct mm_struct init_mm = {
 
 KMEMDUMP_VAR_CORE(init_mm, sizeof(init_mm));
 KMEMDUMP_VAR_CORE_NAMED(init_mm_pgd, init_mm.pgd, sizeof(*init_mm.pgd));
+KMEMDUMP_VAR_CORE(swapper_pg_dir, sizeof(&swapper_pg_dir));
 
 void setup_initial_init_mm(void *start_code, void *end_code,
 			   void *end_data, void *brk)
-- 
2.43.0