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Subject: Re: [PATCH 00/19] Add generic user_landing tracking
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From: Dmitry Safonov <0x7f454c46@gmail.com>
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Date: Mon, 9 Nov 2020 01:27:27 +0000
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To: Andy Lutomirski <luto@kernel.org>, Dmitry Safonov <dima@arista.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Andrew Morton <akpm@linux-foundation.org>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Catalin Marinas <catalin.marinas@arm.com>, Christophe Leroy <christophe.leroy@csgroup.eu>, Guo Ren <guoren@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>, Oleg Nesterov <oleg@redhat.com>, Russell King <linux@armlinux.org.uk>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, Thomas Gleixner <tglx@linutronix.de>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Will Deacon <will@kernel.org>, X86 ML <x86@kernel.org>, linux-arm-kernel <linux-arm-kernel@lists.infradead.org>, Albert Ou <aou@eecs.berkeley.edu>, "David S. Miller" <davem@davemloft.net>, Palmer Dabbelt <palmer@dabbelt.com>, Paul Walmsley <paul.walmsley@sifive.com>, Linux FS Devel <linux-fsdevel@vger.kernel.org>, Christian Borntraeger <borntraeger@de.ibm.com>, Heiko Carstens <hca@linux.ibm.com>, Vasily Gorbik <gor@linux.ibm.com>, linux-s390 <linux-s390@vger.kernel.org>, sparclinux <sparclinux@vger.kernel.org>, "open list:MIPS" <linux-mips@vger.kernel.org>

On 11/8/20 7:07 PM, Andy Lutomirski wrote:
> On Sat, Nov 7, 2020 at 9:17 PM Dmitry Safonov <dima@arista.com> wrote:
>>
>> Started from discussion [1], where was noted that currently a couple of
>> architectures support mremap() for vdso/sigpage, but not munmap().
>> If an application maps something on the ex-place of vdso/sigpage,
>> later after processing signal it will land there (good luck!)
>>
>> Patches set is based on linux-next (next-20201106) and it depends on
>> changes in x86/cleanups (those reclaim TIF_IA32/TIF_X32) and also
>> on my changes in akpm (fixing several mremap() issues).
>>
>> Logically, the patches set divides on:
>> - patch       1: cleanup for patches in x86/cleanups
>> - patches  2-11: cleanups for arch_setup_additional_pages()
> 
> I like these cleanups, although I think you should stop using terms
> like "new-born".  A task being exec'd is not newborn at all -- it's in
> the middle of a transformation.

Thank you for looking at them, Andy :-)

Yeah, somehow I thought about new-execed process as a new-born binary.
I'll try to improve changelogs in v2.

Thanks,
         Dmitry