On Tue, Nov 14, 2017 at 03:03:51PM -0500, Mathieu Desnoyers wrote:
> +/*
> + * If parent process has a registered restartable sequences area, the
> + * child inherits. Only applies when forking a process, not a thread. In
> + * case a parent fork() in the middle of a restartable sequence, set the
> + * resume notifier to force the child to retry.
> + */
> +static inline void rseq_fork(struct task_struct *t, unsigned long clone_flags)
> +{
> + if (clone_flags & CLONE_THREAD) {
> + t->rseq = NULL;
> + t->rseq_len = 0;
> + t->rseq_sig = 0;
> + } else {
> + t->rseq = current->rseq;
> + t->rseq_len = current->rseq_len;
> + t->rseq_sig = current->rseq_sig;
> + rseq_set_notify_resume(t);
> + }
> +}
This hurts my brain... what happens if you fork a multi-threaded
process?
Do we fully inherit the TLS state of the calling thread?
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