Re: [regression] x86/signal/64: Fix SS handling for signals delivered to 64-bit programs breaks dosemu

From: Linus Torvalds
Date: Thu Aug 13 2015 - 20:27:16 EST

On Thu, Aug 13, 2015 at 5:17 PM, Stas Sergeev <stsp@xxxxxxx> wrote:
> For example because you can as well do:
> prctl(ARCH_SET_SIGNAL_SS, 0)
> which will mean "restore ss in sighandler to its current value",

I really think a prctl() is the wrong thing to do.

If you want a signal handler to save/restore segments, I think it
should be a SA_xyz flag to sigaction() (the way we have SA_RESTART
etc). And off by default because of the obvious compatibility issues.

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