From: Christophe Leroy <christophe.leroy@csgroup.eu>
To: linux-hardening@vger.kernel.org,
Russell King <linux@armlinux.org.uk>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Nicholas Piggin <npiggin@gmail.com>,
"Aneesh Kumar K.V" <aneesh.kumar@kernel.org>,
"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Kees Cook <keescook@chromium.org>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org,
linux-mm@kvack.org, steven.price@arm.com,
Phong Tran <tranmanphong@gmail.com>,
mark.rutland@arm.com, Greg KH <greg@kroah.com>
Subject: [PATCH 4/4] ptdump: add check_wx_pages debugfs attribute
Date: Tue, 9 Jan 2024 13:14:38 +0100 [thread overview]
Message-ID: <2e8806da45a4b00249d5c449130b5f9ce78b3403.1704800524.git.christophe.leroy@csgroup.eu> (raw)
In-Reply-To: <cover.1704800524.git.christophe.leroy@csgroup.eu>
Add a writable attribute in debugfs to trigger a
W^X pages check at any time.
To trigger the test, just echo any numeric value into
/sys/kernel/debug/check_wx_pages
The result is provided into dmesg.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
mm/ptdump.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/mm/ptdump.c b/mm/ptdump.c
index 03c1bdae4a43..e154099c2584 100644
--- a/mm/ptdump.c
+++ b/mm/ptdump.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/pagewalk.h>
+#include <linux/debugfs.h>
#include <linux/ptdump.h>
#include <linux/kasan.h>
@@ -163,3 +164,21 @@ void ptdump_walk_pgd(struct ptdump_state *st, struct mm_struct *mm, pgd_t *pgd)
/* Flush out the last page */
st->note_page(st, 0, -1, 0);
}
+
+static int check_wx_debugfs_set(void *data, u64 val)
+{
+ ptdump_check_wx();
+
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(check_wx_fops, NULL, check_wx_debugfs_set, "%llu\n");
+
+static int ptdump_debugfs_init(void)
+{
+ debugfs_create_file("check_wx_pages", 0200, NULL, NULL, &check_wx_fops);
+
+ return 0;
+}
+
+device_initcall(ptdump_debugfs_init);
--
2.41.0
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next prev parent reply other threads:[~2024-01-09 12:15 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-09 12:14 [PATCH 0/4] Refactor CONFIG_DEBUG_WX and check_wx_pages debugfs attribute Christophe Leroy
2024-01-09 12:14 ` [PATCH 1/4] arm: ptdump: Rename CONFIG_DEBUG_WX to CONFIG_ARM_DEBUG_WX Christophe Leroy
2024-01-09 17:09 ` Florian Fainelli
2024-01-09 12:14 ` [PATCH 2/4] arm64, powerpc, riscv, s390, x86: Refactor CONFIG_DEBUG_WX Christophe Leroy
2024-01-09 12:54 ` Alexandre Ghiti
2024-01-09 12:14 ` [PATCH 3/4] powerpc,s390: Define ptdump_check_wx() regardless of CONFIG_DEBUG_WX Christophe Leroy
2024-01-09 12:14 ` Christophe Leroy [this message]
2024-01-09 13:50 ` [PATCH 4/4] ptdump: add check_wx_pages debugfs attribute Heiko Carstens
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