signal: Clear si_sys_private before copying siginfo to userspace
In preparation for unconditionally copying the whole of siginfo to userspace clear si_sys_private. So this kernel internal value is guaranteed not to make it to userspace. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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@ -643,6 +643,9 @@ int dequeue_signal(struct task_struct *tsk, sigset_t *mask, siginfo_t *info)
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spin_unlock(&tsk->sighand->siglock);
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posixtimer_rearm(info);
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spin_lock(&tsk->sighand->siglock);
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/* Don't expose the si_sys_private value to userspace */
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info->si_sys_private = 0;
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}
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#endif
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return signr;
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