linux-kernel - [PATCH 21/26] printk: Register information into meminspect

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Message-ID: <20251119154427.1033475-22-eugen.hristev@linaro.org>
Date: Wed, 19 Nov 2025 17:44:22 +0200
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-arm-msm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	tglx@...utronix.de,
	andersson@...nel.org,
	pmladek@...e.com,
	rdunlap@...radead.org,
	corbet@....net,
	david@...hat.com,
	mhocko@...e.com
Cc: tudor.ambarus@...aro.org,
	mukesh.ojha@....qualcomm.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org,
	jonechou@...gle.com,
	rostedt@...dmis.org,
	linux-doc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-remoteproc@...r.kernel.org,
	linux-arch@...r.kernel.org,
	tony.luck@...el.com,
	kees@...nel.org,
	Eugen Hristev <eugen.hristev@...aro.org>
Subject: [PATCH 21/26] printk: Register information into meminspect

Annotate vital static information into meminspect:
 - prb_descs
 - prb_infos
 - prb
 - prb_data
 - printk_rb_static
 - printk_rb_dynamic

Information on these variables is stored into inspection table.

Register dynamic information into meminspect:
 - new_descs
 - new_infos
 - new_log_buf
This information is being allocated as a memblock, so call
memblock_mark_inspect to mark the block accordingly.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 kernel/printk/printk.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 5aee9ffb16b9..8b5aba2527ac 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -49,6 +49,7 @@
 #include <linux/sched/debug.h>
 #include <linux/sched/task_stack.h>
 #include <linux/panic.h>
+#include <linux/meminspect.h>
 
 #include <linux/uaccess.h>
 #include <asm/sections.h>
@@ -513,10 +514,16 @@ static u32 log_buf_len = __LOG_BUF_LEN;
 #endif
 _DEFINE_PRINTKRB(printk_rb_static, CONFIG_LOG_BUF_SHIFT - PRB_AVGBITS,
 		 PRB_AVGBITS, &__log_buf[0]);
+MEMINSPECT_NAMED_ENTRY(prb_descs, _printk_rb_static_descs);
+MEMINSPECT_NAMED_ENTRY(prb_infos, _printk_rb_static_infos);
+MEMINSPECT_NAMED_ENTRY(prb_data, __log_buf);
+MEMINSPECT_SIMPLE_ENTRY(printk_rb_static);
 
 static struct printk_ringbuffer printk_rb_dynamic;
+MEMINSPECT_SIMPLE_ENTRY(printk_rb_dynamic);
 
 struct printk_ringbuffer *prb = &printk_rb_static;
+MEMINSPECT_SIMPLE_ENTRY(prb);
 
 /*
  * We cannot access per-CPU data (e.g. per-CPU flush irq_work) before
@@ -1190,6 +1197,7 @@ void __init setup_log_buf(int early)
 		       new_log_buf_len);
 		goto out;
 	}
+	memblock_mark_inspect(virt_to_phys(new_log_buf), new_log_buf_len);
 
 	new_descs_size = new_descs_count * sizeof(struct prb_desc);
 	new_descs = memblock_alloc(new_descs_size, LOG_ALIGN);
@@ -1198,6 +1206,7 @@ void __init setup_log_buf(int early)
 		       new_descs_size);
 		goto err_free_log_buf;
 	}
+	memblock_mark_inspect(virt_to_phys(new_descs), new_descs_size);
 
 	new_infos_size = new_descs_count * sizeof(struct printk_info);
 	new_infos = memblock_alloc(new_infos_size, LOG_ALIGN);
@@ -1206,6 +1215,7 @@ void __init setup_log_buf(int early)
 		       new_infos_size);
 		goto err_free_descs;
 	}
+	memblock_mark_inspect(virt_to_phys(new_infos), new_infos_size);
 
 	prb_rec_init_rd(&r, &info, &setup_text_buf[0], sizeof(setup_text_buf));
 
@@ -1258,8 +1268,10 @@ void __init setup_log_buf(int early)
 
 err_free_descs:
 	memblock_free(new_descs, new_descs_size);
+	memblock_clear_inspect(virt_to_phys(new_descs), new_descs_size);
 err_free_log_buf:
 	memblock_free(new_log_buf, new_log_buf_len);
+	memblock_clear_inspect(virt_to_phys(new_log_buf), new_log_buf_len);
 out:
 	print_log_buf_usage_stats();
 }
-- 
2.43.0