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Date: Tue, 24 Mar 2020 15:36:34 +0000
From: Will Deacon <will@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Will Deacon <will@...nel.org>,
Eric Dumazet <edumazet@...gle.com>,
Jann Horn <jannh@...gle.com>,
Kees Cook <keescook@...omium.org>,
Maddie Stone <maddiestone@...gle.com>,
Marco Elver <elver@...gle.com>,
"Paul E . McKenney" <paulmck@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
kernel-team@...roid.com,
kernel-hardening@...ts.openwall.com
Subject: [RFC PATCH 12/21] list: Poison ->next pointer for non-RCU deletion of 'hlist_nulls_node'
hlist_nulls_del() is used for non-RCU deletion of an 'hlist_nulls_node'
and so we can safely poison the ->next pointer without having to worry
about concurrent readers, just like we do for other non-RCU list
deletion primitives
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Will Deacon <will@...nel.org>
---
include/linux/list_nulls.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/linux/list_nulls.h b/include/linux/list_nulls.h
index fd154ceb5b0d..48f33ae16381 100644
--- a/include/linux/list_nulls.h
+++ b/include/linux/list_nulls.h
@@ -99,6 +99,7 @@ static inline void __hlist_nulls_del(struct hlist_nulls_node *n)
static inline void hlist_nulls_del(struct hlist_nulls_node *n)
{
__hlist_nulls_del(n);
+ n->next = LIST_POISON1;
n->pprev = LIST_POISON2;
}
--
2.20.1
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