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Message-Id: <1450331796-10329-3-git-send-email-dave@progbits.org>
Date: Thu, 17 Dec 2015 00:56:33 -0500
From: David Windsor <dave@...gbits.org>
To: kernel-hardening@...ts.openwall.com
Cc: David Windsor <dave@...gbits.org>,
Kees Cook <keescook@...omium.org>
Subject: [RFC PATCH 2/5] percpu_ref: decrease per-CPU refcount bias
This change is necessary to prevent overflows from occuring in
percpu_switch_to_atomic_rcu during init on x86.
Signed-off-by: David Windsor <dave@...gbits.org>
---
lib/percpu-refcount.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/percpu-refcount.c b/lib/percpu-refcount.c
index 6111bcb..02e816b 100644
--- a/lib/percpu-refcount.c
+++ b/lib/percpu-refcount.c
@@ -31,7 +31,7 @@
* atomic_long_t can't hit 0 before we've added up all the percpu refs.
*/
-#define PERCPU_COUNT_BIAS (1LU << (BITS_PER_LONG - 1))
+#define PERCPU_COUNT_BIAS (1LU << (BITS_PER_LONG - 2))
static DECLARE_WAIT_QUEUE_HEAD(percpu_ref_switch_waitq);
--
2.5.0
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