Re: [PATCH 1/5] signal(x86_32): Improve the signal stack overflowcheck

[Roland McGrath]

> I spent some time read you mail carefully and dig into the code again.
> 
> And yes, you are right. It's possible that SA_ONSTACK has been cleared
> before the second signal on the same stack comes.

It's not necessary for SA_ONSTACK to have "been cleared", by which I assume
you mean a sigaction call with SA_ONSTACK not set in sa_flags.  That is
indeed possible, but it's not the only case your patch broke.  It can just
be a different signal whose sigaction never had SA_ONSTACK, when you are
still on the signal stack from an earlier signal that did have SA_ONSTACK.

> So this patch is wrong  :( . I will revise the other 4 patches.

For 2 and 3, I would rather just wait until we unify signal.c anyway.


Thanks,
Roland
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