linux-kernel - [PATCH 2/2] sched: Move the sleeping while atomic checks early in cond

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]

Date:	Fri, 10 Jul 2009 16:49:51 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH 2/2] sched: Move the sleeping while atomic checks early in cond_resched()

might_sleep() is called lately in cond_resched(), after the
need_resched()/preempt enabled/system running tests are checked.

It's better to check the sleeps while atomic earlier and not depend
on some environment datas that reduce the chances to detect a
problem.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
---
 include/linux/sched.h |    2 ++
 kernel/sched.c        |    3 ---
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 0cb0d8d..e357dc7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2279,11 +2279,13 @@ extern int _cond_resched(void);
 #ifdef CONFIG_PREEMPT_BKL
 static inline int cond_resched(void)
 {
+	might_sleep();
 	return 0;
 }
 #else
 static inline int cond_resched(void)
 {
+	might_sleep();
 	return _cond_resched();
 }
 #endif
diff --git a/kernel/sched.c b/kernel/sched.c
index 87ecac1..c22804b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6605,9 +6605,6 @@ SYSCALL_DEFINE0(sched_yield)
 
 static void __cond_resched(void)
 {
-#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
-	__might_sleep(__FILE__, __LINE__);
-#endif
 	/*
 	 * The BKS might be reacquired before we have dropped
 	 * PREEMPT_ACTIVE, which could trigger a second
-- 
1.6.2.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/