linux-kernel - [RESEND PATCH v2] arm/mm/ptdump:Add address markers for KASAN regions

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Date:   Wed, 20 Jan 2021 20:50:10 +0800
From:   Hailong liu <carver4lio@....com>
To:     Russell King <linux@...linux.org.uk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Mike Rapoport <rppt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kasan-dev@...glegroups.com, Hailong Liu <liu.hailong6@....com.cn>
Subject: [RESEND PATCH v2] arm/mm/ptdump:Add address markers for KASAN regions

From: Hailong Liu <liu.hailong6@....com.cn>

ARM has recently supported KASAN, so I think that it's time to add KASAN
regions for PTDUMP on ARM.

I have tested this patch with QEMU + vexpress-a15. Both CONFIG_ARM_LPAE
and no CONFIG_ARM_LPAE.

The result after patching looks like this:
 ---[ Kasan shadow start ]---
 0x6ee00000-0x7af00000         193M     RW NX SHD MEM/CACHED/WBWA
 0x7b000000-0x7f000000          64M     ro NX SHD MEM/CACHED/WBWA
 ---[ Kasan shadow end ]---
 ---[ Modules ]---
 ---[ Kernel Mapping ]---
	......
 ---[ vmalloc() Area ]---
	......
 ---[ vmalloc() End ]---
 ---[ Fixmap Area ]---
 ---[ Vectors ]---
 	......
 ---[ Vectors End ]---

v2:
- fix the puzzling subject and the description due to my
carelessness.

Signed-off-by: Hailong Liu <liu.hailong6@....com.cn>
---
 arch/arm/mm/dump.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mm/dump.c b/arch/arm/mm/dump.c
index c18d23a5e5f1..93ff0097f00b 100644
--- a/arch/arm/mm/dump.c
+++ b/arch/arm/mm/dump.c
@@ -19,6 +19,10 @@
 #include <asm/ptdump.h>
 
 static struct addr_marker address_markers[] = {
+#ifdef CONFIG_KASAN
+	{ KASAN_SHADOW_START,	"Kasan shadow start"},
+	{ KASAN_SHADOW_END,	"Kasan shadow end"},
+#endif
 	{ MODULES_VADDR,	"Modules" },
 	{ PAGE_OFFSET,		"Kernel Mapping" },
 	{ 0,			"vmalloc() Area" },
@@ -429,8 +433,11 @@ static void ptdump_initialize(void)
 				if (pg_level[i].bits[j].nx_bit)
 					pg_level[i].nx_bit = &pg_level[i].bits[j];
 			}
-
+#ifdef CONFIG_KASAN
+	address_markers[4].start_address = VMALLOC_START;
+#else
 	address_markers[2].start_address = VMALLOC_START;
+#endif
 }
 
 static struct ptdump_info kernel_ptdump_info = {
-- 
2.17.1