linux-kernel - [PATCH 4/4] s390: add kfence region to pagetable dumper

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Date:   Wed, 28 Jul 2021 21:02:54 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        kasan-dev@...glegroups.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 4/4] s390: add kfence region to pagetable dumper

From: Sven Schnelle <svens@...ux.ibm.com>

Signed-off-by: Sven Schnelle <svens@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
---
 arch/s390/mm/dump_pagetables.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/s390/mm/dump_pagetables.c b/arch/s390/mm/dump_pagetables.c
index e40a30647d99..07dcec925bf4 100644
--- a/arch/s390/mm/dump_pagetables.c
+++ b/arch/s390/mm/dump_pagetables.c
@@ -4,6 +4,7 @@
 #include <linux/seq_file.h>
 #include <linux/debugfs.h>
 #include <linux/mm.h>
+#include <linux/kfence.h>
 #include <linux/kasan.h>
 #include <asm/ptdump.h>
 #include <asm/kasan.h>
@@ -21,6 +22,8 @@ enum address_markers_idx {
 	IDENTITY_BEFORE_END_NR,
 	KERNEL_START_NR,
 	KERNEL_END_NR,
+	KFENCE_START_NR,
+	KFENCE_END_NR,
 	IDENTITY_AFTER_NR,
 	IDENTITY_AFTER_END_NR,
 #ifdef CONFIG_KASAN
@@ -40,6 +43,10 @@ static struct addr_marker address_markers[] = {
 	[IDENTITY_BEFORE_END_NR] = {(unsigned long)_stext, "Identity Mapping End"},
 	[KERNEL_START_NR]	= {(unsigned long)_stext, "Kernel Image Start"},
 	[KERNEL_END_NR]		= {(unsigned long)_end, "Kernel Image End"},
+#ifdef CONFIG_KFENCE
+	[KFENCE_START_NR]	= {0, "KFence Pool Start"},
+	[KFENCE_END_NR]		= {0, "KFence Pool End"},
+#endif
 	[IDENTITY_AFTER_NR]	= {(unsigned long)_end, "Identity Mapping Start"},
 	[IDENTITY_AFTER_END_NR]	= {0, "Identity Mapping End"},
 #ifdef CONFIG_KASAN
@@ -248,6 +255,9 @@ static void sort_address_markers(void)
 
 static int pt_dump_init(void)
 {
+#ifdef CONFIG_KFENCE
+	unsigned long kfence_start = (unsigned long)__kfence_pool;
+#endif
 	/*
 	 * Figure out the maximum virtual address being accessible with the
 	 * kernel ASCE. We need this to keep the page table walker functions
@@ -262,6 +272,10 @@ static int pt_dump_init(void)
 	address_markers[VMEMMAP_END_NR].start_address = (unsigned long)vmemmap + vmemmap_size;
 	address_markers[VMALLOC_NR].start_address = VMALLOC_START;
 	address_markers[VMALLOC_END_NR].start_address = VMALLOC_END;
+#ifdef CONFIG_KFENCE
+	address_markers[KFENCE_START_NR].start_address = kfence_start;
+	address_markers[KFENCE_END_NR].start_address = kfence_start + KFENCE_POOL_SIZE;
+#endif
 	sort_address_markers();
 #ifdef CONFIG_PTDUMP_DEBUGFS
 	debugfs_create_file("kernel_page_tables", 0400, NULL, NULL, &ptdump_fops);
-- 
2.25.1