linux-kernel - Re: [PATCH V9 13/24] LoongArch: Add system call support

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Date:   Sat, 7 May 2022 14:11:04 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Huacai Chen <chenhuacai@...il.com>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Airlie <airlied@...ux.ie>,
        Jonathan Corbet <corbet@....net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Xuefeng Li <lixuefeng@...ngson.cn>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Guo Ren <guoren@...nel.org>, Xuerui Wang <kernel@...0n.name>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Linux API <linux-api@...r.kernel.org>
Subject: Re: [PATCH V9 13/24] LoongArch: Add system call support

On Sat, Apr 30, 2022 at 12:34:52PM +0200, Arnd Bergmann wrote:
> On Sat, Apr 30, 2022 at 12:05 PM Huacai Chen <chenhuacai@...il.com> wrote:
> > On Sat, Apr 30, 2022 at 5:45 PM Arnd Bergmann <arnd@...db.de> wrote:
> > > On Sat, Apr 30, 2022 at 11:05 AM Huacai Chen <chenhuacai@...ngson.cn> wrote:
> > > >
> > > > This patch adds system call support and related uaccess.h for LoongArch.
> > > >
> > > > Q: Why keep __ARCH_WANT_NEW_STAT definition while there is statx:
> > > > A: Until the latest glibc release (2.34), statx is only used for 32-bit
> > > >    platforms, or 64-bit platforms with 32-bit timestamp. I.e., Most 64-
> > > >    bit platforms still use newstat now.
> > > >
> > > > Q: Why keep _ARCH_WANT_SYS_CLONE definition while there is clone3:
> > > > A: The latest glibc release (2.34) has some basic support for clone3 but
> > > >    it isn't complete. E.g., pthread_create() and spawni() have converted
> > > >    to use clone3 but fork() will still use clone. Moreover, some seccomp
> > > >    related applications can still not work perfectly with clone3. E.g.,
> > > >    Chromium sandbox cannot work at all and there is no solution for it,
> > > >    which is more terrible than the fork() story [1].
> > > >
> > > > [1] https://chromium-review.googlesource.com/c/chromium/src/+/2936184
> > >
> > > I still think these have to be removed. There is no mainline glibc or musl
> > > port yet, and neither of them should actually be required. Please remove
> > > them here, and modify your libc patches accordingly when you send those
> > > upstream.
> >
> > If this is just a problem that can be resolved by upgrading
> > glibc/musl, I will remove them. But the Chromium problem (or sandbox
> > problem in general) seems to have no solution now.
> 
> I added Christian Brauner to Cc now, maybe he has come across the
> sandbox problem before and has an idea for a solution.

(I just got back from LSFMM so I'll reply in more detail next week. I'm
still pretty jet-lagged.)