Re: [RFC 1/3] x86/signal: add SA_{X32,IA32}_ABI sa_flags

From	Dmitry Safonov <0x7f454c46@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [RFC 1/3] x86/signal: add SA_{X32,IA32}_ABI sa_flags
Date	2016-04-25 22:40 +0200
Message-ID	<rrVsu-3wP-9@gated-at.bofh.it> (permalink)
References	<rrRoT-mn-11@gated-at.bofh.it> <rrUmK-2Ic-25@gated-at.bofh.it>
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2016-04-25 22:20 GMT+03:00 Andy Lutomirski <luto@amacapital.net>:
> On Mon, Apr 25, 2016 at 9:12 AM, Dmitry Safonov <dsafonov@virtuozzo.com> wrote:
>> Introduce new flags that defines which ABI to use on creating sigframe.
>> Those flags one may set from the userspace, or kernel will set them
>> according to syscall, which sets handler for a signal.
>> So that will drop the dependency on TIF_IA32/TIF_X32 flags on syscall deliver.
>> Those flags will be used only under CONFIG_COMPAT.
>>
>> The same way ARM uses sa_flags to differ in which mode deliver signal
>> for 26-bit applications (look at SA_THIRYTWO).
>
> Hmm.  Do we want to make these user-visible at all, or should it be
> purely an in-kernel thing?

Yes, I'll rework it to not expose to userspace.
I thought about it as a bonus when did it, but yeah, it's better
not reveal a new interfaces until they really needed.
But anyway, I did it for RFC, and I don't know what's better
for hidden flag: reuse sa_flags or invent in ksig a new hidden
member only for the kernel?

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[RFC 1/3] x86/signal: add SA_{X32,IA32}_ABI sa_flags Dmitry Safonov <dsafonov@virtuozzo.com> - 2016-04-25 18:20 +0200
  [RFC 2/3] x86/coredump: use core regs, rather that TIF_IA32 flag Dmitry Safonov <dsafonov@virtuozzo.com> - 2016-04-25 18:20 +0200
    Re: [RFC 2/3] x86/coredump: use core regs, rather that TIF_IA32 flag Andy Lutomirski <luto@amacapital.net> - 2016-04-25 19:00 +0200
  [RFC 3/3] x86/ptrace: down with test_thread_flag(TIF_IA32) Dmitry Safonov <dsafonov@virtuozzo.com> - 2016-04-25 18:20 +0200
    Re: [RFC 3/3] x86/ptrace: down with test_thread_flag(TIF_IA32) Andy Lutomirski <luto@amacapital.net> - 2016-04-25 19:00 +0200
      Re: [RFC 3/3] x86/ptrace: down with test_thread_flag(TIF_IA32) Andy Lutomirski <luto@amacapital.net> - 2016-04-25 21:40 +0200
        Re: [RFC 3/3] x86/ptrace: down with test_thread_flag(TIF_IA32) Dmitry Safonov <0x7f454c46@gmail.com> - 2016-04-25 22:40 +0200
  Re: [RFC 1/3] x86/signal: add SA_{X32,IA32}_ABI sa_flags Andy Lutomirski <luto@amacapital.net> - 2016-04-25 21:30 +0200
    Re: [RFC 1/3] x86/signal: add SA_{X32,IA32}_ABI sa_flags Andy Lutomirski <luto@amacapital.net> - 2016-04-25 22:40 +0200
    Re: [RFC 1/3] x86/signal: add SA_{X32,IA32}_ABI sa_flags Dmitry Safonov <0x7f454c46@gmail.com> - 2016-04-25 22:40 +0200

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