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  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Date:   Fri, 14 Aug 2020 12:55:22 +0800
From:   Jiafei Pan <>
        Jiafei Pan <>
Subject: [PATCH v2] softirq: add irq off checking for __raise_softirq_irqoff

__raise_softirq_irqoff() will update per-CPU mask of pending softirqs,
it need to be called in irq disabled context in order to keep it atomic
operation, otherwise it will be interrupted by hardware interrupt,
and per-CPU softirqs pending mask will be corrupted, the result is
there will be unexpected issue, for example hrtimer soft irq will
be losed and soft hrtimer will never be expire and handled.

Enable CONFIG_PROVE_LOCKING to use lockdep_assert_irqs_disabled() to
check hardirqs and softirqs status, and provide warning in irqs enabled

Signed-off-by: Jiafei Pan <>
Changes in v2:
- use lockdep_assert_irqs_disabled()
- removed extra comments
- changed commit message

 kernel/softirq.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index bf88d7f62433..09229ad82209 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -481,6 +481,7 @@ void raise_softirq(unsigned int nr)
 void __raise_softirq_irqoff(unsigned int nr)
+	lockdep_assert_irqs_disabled();
 	or_softirq_pending(1UL << nr);

Powered by blists - more mailing lists