linux-kernel - Re: [PATCH v2 3/7] Introduce a new clone4 syscall with more flag bits and extensible arguments

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Date:	Mon, 23 Mar 2015 14:11:45 +0000
From:	David Drysdale <drysdale@...gle.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Lutomirski <luto@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	"H. Peter Anvin" <hpa@...or.com>, Rik van Riel <riel@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Thiago Macieira <thiago.macieira@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	X86 ML <x86@...nel.org>
Subject: Re: [PATCH v2 3/7] Introduce a new clone4 syscall with more flag bits
 and extensible arguments

On Sun, Mar 15, 2015 at 7:59 AM, Josh Triplett <josh@...htriplett.org> wrote:
> diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
> index 0286735..ba28306 100644
> --- a/arch/x86/ia32/ia32entry.S
> +++ b/arch/x86/ia32/ia32entry.S
> @@ -483,6 +483,7 @@ GLOBAL(\label)
>         PTREGSCALL stub32_execveat, compat_sys_execveat
>         PTREGSCALL stub32_fork, sys_fork
>         PTREGSCALL stub32_vfork, sys_vfork
> +       PTREGSCALL stub32_clone4, compat_sys_clone4
>
>         ALIGN
>  GLOBAL(stub32_clone)
> diff --git a/arch/x86/kernel/entry_64.S b/arch/x86/kernel/entry_64.S
> index 1d74d16..ead143f 100644
> --- a/arch/x86/kernel/entry_64.S
> +++ b/arch/x86/kernel/entry_64.S
> @@ -520,6 +520,7 @@ END(\label)
>         FORK_LIKE  clone
>         FORK_LIKE  fork
>         FORK_LIKE  vfork
> +       FORK_LIKE  clone4
>         FIXED_FRAME stub_iopl, sys_iopl
>
>  ENTRY(stub_execve)
> diff --git a/arch/x86/syscalls/syscall_32.tbl b/arch/x86/syscalls/syscall_32.tbl
> index b3560ec..56fcc90 100644
> --- a/arch/x86/syscalls/syscall_32.tbl
> +++ b/arch/x86/syscalls/syscall_32.tbl
> @@ -365,3 +365,4 @@
>  356    i386    memfd_create            sys_memfd_create
>  357    i386    bpf                     sys_bpf
>  358    i386    execveat                sys_execveat                    stub32_execveat
> +359    i386    clone4                  sys_clone4                      stub32_clone4
> diff --git a/arch/x86/syscalls/syscall_64.tbl b/arch/x86/syscalls/syscall_64.tbl
> index 8d656fb..af15b0f 100644
> --- a/arch/x86/syscalls/syscall_64.tbl
> +++ b/arch/x86/syscalls/syscall_64.tbl
> @@ -329,6 +329,7 @@
>  320    common  kexec_file_load         sys_kexec_file_load
>  321    common  bpf                     sys_bpf
>  322    64      execveat                stub_execveat
> +323    64      clone4                  stub_clone4
>
>  #
>  # x32-specific system call numbers start at 512 to avoid cache impact
> @@ -368,3 +369,4 @@
>  543    x32     io_setup                compat_sys_io_setup
>  544    x32     io_submit               compat_sys_io_submit
>  545    x32     execveat                stub_x32_execveat
> +546    x32     clone4                  stub32_clone4

Doesn't this need an x32 specific wrapper (to ensure the full
set of registers are saved)?
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