linux-kernel - Re: [PATCH v2] arch: Reserve map_shadow_stack() syscall number for all architectures

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Message-Id: <5d397fe4-a520-4336-b966-29bc5b798236@app.fastmail.com>
Date:   Fri, 06 Oct 2023 22:29:32 +0200
From:   "Arnd Bergmann" <arnd@...db.de>
To:     "Rick Edgecombe" <rick.p.edgecombe@...el.com>,
        "Sohil Mehta" <sohil.mehta@...el.com>,
        "Dave Hansen" <dave.hansen@...ux.intel.com>,
        "Ingo Molnar" <mingo@...hat.com>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>
Cc:     "Christian Borntraeger" <borntraeger@...ux.ibm.com>,
        "Thomas Gleixner" <tglx@...utronix.de>,
        "Helge Deller" <deller@....de>,
        "Lukas Bulwahn" <lukas.bulwahn@...il.com>,
        "Ian Rogers" <irogers@...gle.com>,
        "Alexander Gordeev" <agordeev@...ux.ibm.com>,
        "David S . Miller" <davem@...emloft.net>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Max Filippov" <jcmvbkbc@...il.com>,
        "Russell King" <linux@...linux.org.uk>,
        "Yoshinori Sato" <ysato@...rs.sourceforge.jp>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        "chris@...kel.net" <chris@...kel.net>,
        "Heiko Carstens" <hca@...ux.ibm.com>,
        "Catalin Marinas" <catalin.marinas@....com>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Brian Gerst" <brgerst@...il.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "Mark Brown" <broonie@...nel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "Christophe Leroy" <christophe.leroy@...roup.eu>,
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        "Michael Ellerman" <mpe@...erman.id.au>,
        "Thomas Bogendoerfer" <tsbogend@...ha.franken.de>,
        "Ivan Kokshaysky" <ink@...assic.park.msu.ru>,
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        "Michal Simek" <monstr@...str.eu>,
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        "Deepak Gupta" <debug@...osinc.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "Richard Henderson" <richard.henderson@...aro.org>,
        "Will Deacon" <will@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        "gor@...ux.ibm.com" <gor@...ux.ibm.com>,
        "Alexander Shishkin" <alexander.shishkin@...ux.intel.com>,
        "Matt Turner" <mattst88@...il.com>,
        "John Paul Adrian Glaubitz" <glaubitz@...sik.fu-berlin.de>,
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        <linux-arm-kernel@...ts.infradead.org>,
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        "James E . J . Bottomley" <James.Bottomley@...senPartnership.com>,
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        "Rich Felker" <dalias@...c.org>,
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        "linux-perf-users@...r.kernel.org" <linux-perf-users@...r.kernel.org>
Subject: Re: [PATCH v2] arch: Reserve map_shadow_stack() syscall number for all
 architectures

On Fri, Oct 6, 2023, at 22:01, Edgecombe, Rick P wrote:
> On Tue, 2023-10-03 at 10:18 -0700, Sohil Mehta wrote:
>> > If you like, I can pick this up for 6.7 through the asm-generic
>> > tree. If you think this should be part of 6.6, I would suggest
>> > to merge it through the tree that originally contained the
>> > syscall code.
>> > 
>> 
>> Dave, Ingo, would you prefer to take this patch through 6.6 or defer
>> it
>> until 6.7?
>> 
>> It's not necessarily a fix but it does help finish up the shstk
>> syscall
>> added with 6.6. Also, it might help reduce some merge conflicts later
>> if
>> newer syscalls are being added during the 6.7 window.
>
> Hi Arnd,
>
> It doesn't look like anyone is pouncing on the syscall number in linux-
> next currently. It might be nice to have this patch go through linux-
> next since it touches so many architectures. And it sounds like x86
> folk are ok with this, so if you could pick it up for 6.7 that would be
> great. Thanks!

Ok, I picked it up now, should be in linux-next starting next week.

     Arnd