linux-kernel - [PATCH 5/9] ARM: entry: fix missing statistics of rseq exit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260125164016.331257-6-qq570070308@gmail.com>
Date: Mon, 26 Jan 2026 00:40:12 +0800
From: Xie Yuanbin <qq570070308@...il.com>
To: linux@...linux.org.uk,
	johannes@...solutions.net,
	masahiroy@...nel.org,
	jgross@...e.com,
	nsc@...nel.org,
	kees@...nel.org,
	tglx@...nel.org,
	mingo@...nel.org,
	frederic@...nel.org,
	paulmck@...nel.org,
	peterz@...radead.org,
	mathieu.desnoyers@...icios.com,
	luto@...nel.org,
	edumazet@...gle.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Xie Yuanbin <qq570070308@...il.com>
Subject: [PATCH 5/9] ARM: entry: fix missing statistics of rseq exit

rseq_syscall_exit_to_user_mode() or rseq_irqentry_exit_to_user_mode() is
missing on arm when returning to user mode, this leads to missing
statistics of rseq exit.

Add rseq_irqentry_exit_to_user_mode() to
arm_exit_to_user_mode_no_work_pending().

Fixes: 5412910487d0 ("rseq: Expose lightweight statistics in debugfs")

Signed-off-by: Xie Yuanbin <qq570070308@...il.com>
---
 arch/arm/kernel/entry.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/kernel/entry.c b/arch/arm/kernel/entry.c
index d32f7be9a107..60e5c250da88 100644
--- a/arch/arm/kernel/entry.c
+++ b/arch/arm/kernel/entry.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 #include <linux/linkage.h>
+#include <linux/rseq_entry.h>
 #include <linux/irq-entry-common.h>
 #include <linux/kstack_erase.h>
 
@@ -13,6 +14,7 @@
 asmlinkage __section(".entry.text")
 void arm_exit_to_user_mode_no_work_pending(void)
 {
+	rseq_irqentry_exit_to_user_mode();
 	exit_to_user_mode();
 #ifdef CONFIG_KSTACK_ERASE
 	stackleak_erase_on_task_stack();
-- 
2.51.0