linux-kernel - [PATCH] mm: init: report kasan-tag information stored in page->flags

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Date:   Wed, 15 Apr 2020 13:42:50 +0800
From:   jing.xia.mail@...il.com
To:     akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        chunyan.zhang@...soc.com, orson.zhai@...soc.com,
        Jing Xia <jing.xia@...soc.com>
Subject: [PATCH] mm: init: report kasan-tag information stored in page->flags

From: Jing Xia <jing.xia@...soc.com>

The pagefalgs_layout_usage shows incorrect message by means of
mminit_loglevel when Kasan runs in the mode of software tag-based
enabled with CONFIG_KASAN_SW_TAGS.
This patch corrects it and reports kasan-tag information.

Signed-off-by: Jing Xia <jing.xia@...soc.com>
---
 mm/mm_init.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 7da6991..435e5f7 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -67,26 +67,30 @@ void __init mminit_verify_pageflags_layout(void)
 	unsigned long or_mask, add_mask;
 
 	shift = 8 * sizeof(unsigned long);
-	width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH - LAST_CPUPID_SHIFT;
+	width = shift - SECTIONS_WIDTH - NODES_WIDTH - ZONES_WIDTH
+		- LAST_CPUPID_SHIFT - KASAN_TAG_WIDTH;
 	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_widths",
-		"Section %d Node %d Zone %d Lastcpupid %d Flags %d\n",
+		"Section %d Node %d Zone %d Lastcpupid %d Kasantag %d Flags %d\n",
 		SECTIONS_WIDTH,
 		NODES_WIDTH,
 		ZONES_WIDTH,
 		LAST_CPUPID_WIDTH,
+		KASAN_TAG_WIDTH,
 		NR_PAGEFLAGS);
 	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_shifts",
-		"Section %d Node %d Zone %d Lastcpupid %d\n",
+		"Section %d Node %d Zone %d Lastcpupid %d Kasantag %d\n",
 		SECTIONS_SHIFT,
 		NODES_SHIFT,
 		ZONES_SHIFT,
-		LAST_CPUPID_SHIFT);
+		LAST_CPUPID_SHIFT,
+		KASAN_TAG_WIDTH);
 	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_pgshifts",
-		"Section %lu Node %lu Zone %lu Lastcpupid %lu\n",
+		"Section %lu Node %lu Zone %lu Lastcpupid %lu Kasantag %lu\n",
 		(unsigned long)SECTIONS_PGSHIFT,
 		(unsigned long)NODES_PGSHIFT,
 		(unsigned long)ZONES_PGSHIFT,
-		(unsigned long)LAST_CPUPID_PGSHIFT);
+		(unsigned long)LAST_CPUPID_PGSHIFT,
+		(unsigned long)KASAN_TAG_PGSHIFT);
 	mminit_dprintk(MMINIT_TRACE, "pageflags_layout_nodezoneid",
 		"Node/Zone ID: %lu -> %lu\n",
 		(unsigned long)(ZONEID_PGOFF + ZONEID_SHIFT),
-- 
1.9.1