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authorChristophe Leroy <christophe.leroy@csgroup.eu>2024-01-30 11:34:36 +0100
committerAndrew Morton <akpm@linux-foundation.org>2024-02-22 10:24:47 -0800
commit565474afe08ad28de0d655c5ed36aab3702cb93d (patch)
tree24d6c75665df5796a0e1848d3f9484e65426160d /mm/ptdump.c
parent6cdc82db0c044d36137dd98f33e8aa0b8742987f (diff)
downloadlwn-565474afe08ad28de0d655c5ed36aab3702cb93d.tar.gz
lwn-565474afe08ad28de0d655c5ed36aab3702cb93d.zip
mm: ptdump: add check_wx_pages debugfs attribute
Add a readable attribute in debugfs to trigger a W^X pages check at any time. To trigger the test, just read /sys/kernel/debug/check_wx_pages It will report FAILED if the test failed, SUCCESS otherwise. Detailed result is provided into dmesg. Link: https://lkml.kernel.org/r/e947fb1a9f3f5466344823e532d343ff194ae03d.1706610398.git.christophe.leroy@csgroup.eu Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alexghiti@rivosinc.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: "Aneesh Kumar K.V (IBM)" <aneesh.kumar@kernel.org> Cc: Borislav Petkov (AMD) <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: Greg KH <greg@kroah.com> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Kees Cook <keescook@chromium.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Phong Tran <tranmanphong@gmail.com> Cc: Russell King <linux@armlinux.org.uk> Cc: Steven Price <steven.price@arm.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/ptdump.c')
-rw-r--r--mm/ptdump.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/ptdump.c b/mm/ptdump.c
index 03c1bdae4a43..106e1d66e9f9 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 +164,24 @@ 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_show(struct seq_file *m, void *v)
+{
+ if (ptdump_check_wx())
+ seq_puts(m, "SUCCESS\n");
+ else
+ seq_puts(m, "FAILED\n");
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(check_wx);
+
+static int ptdump_debugfs_init(void)
+{
+ debugfs_create_file("check_wx_pages", 0400, NULL, NULL, &check_wx_fops);
+
+ return 0;
+}
+
+device_initcall(ptdump_debugfs_init);