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authorYang Yang <yang.yang29@zte.com.cn>2016-12-30 16:17:55 +0800
committerThomas Gleixner <tglx@linutronix.de>2017-02-13 16:12:22 +0100
commit25f71d1c3e98ef0e52371746220d66458eac75bc (patch)
treec368314d9e71ab27b0d021c518bb14d63f79f3f7
parentbfeda41d06d85ad9d52f2413cfc2b77be5022f75 (diff)
futex: Move futex_init() to core_initcall
The UEVENT user mode helper is enabled before the initcalls are executed and is available when the root filesystem has been mounted. The user mode helper is triggered by device init calls and the executable might use the futex syscall. futex_init() is marked __initcall which maps to device_initcall, but there is no guarantee that futex_init() is invoked _before_ the first device init call which triggers the UEVENT user mode helper. If the user mode helper uses the futex syscall before futex_init() then the syscall crashes with a NULL pointer dereference because the futex subsystem has not been initialized yet. Move futex_init() to core_initcall so futexes are initialized before the root filesystem is mounted and the usermode helper becomes available. [ tglx: Rewrote changelog ] Signed-off-by: Yang Yang <yang.yang29@zte.com.cn> Cc: jiang.biao2@zte.com.cn Cc: jiang.zhengxiong@zte.com.cn Cc: zhong.weidong@zte.com.cn Cc: deng.huali@zte.com.cn Cc: Peter Zijlstra <peterz@infradead.org> Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1483085875-6130-1-git-send-email-yang.yang29@zte.com.cn Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
-rw-r--r--kernel/futex.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/futex.c b/kernel/futex.c
index 0842c8ca534b..cdf365036141 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -3323,4 +3323,4 @@ static int __init futex_init(void)
return 0;
}
-__initcall(futex_init);
+core_initcall(futex_init);