linux-kernel - Re: [PATCH 07/11] y2038: syscalls: rename y2038 compat syscalls

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Message-Id: <20190110205522.GC3676@osiris>
Date:   Thu, 10 Jan 2019 21:55:22 +0100
From:   Heiko Carstens <heiko.carstens@...ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     y2038@...ts.linaro.org, linux-api@...r.kernel.org,
        linux-kernel@...r.kernel.org, mattst88@...il.com,
        linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, tony.luck@...el.com, fenghua.yu@...el.com,
        geert@...ux-m68k.org, monstr@...str.eu, paul.burton@...s.com,
        deller@....de, benh@...nel.crashing.org, mpe@...erman.id.au,
        schwidefsky@...ibm.com, dalias@...c.org, davem@...emloft.net,
        luto@...nel.org, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, x86@...nel.org, jcmvbkbc@...il.com,
        akpm@...ux-foundation.org, deepa.kernel@...il.com,
        ebiederm@...ssion.com, firoz.khan@...aro.org,
        linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linux-m68k@...ts.linux-m68k.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        linux-sh@...r.kernel.org, sparclinux@...r.kernel.org,
        netdev@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org
Subject: Re: [PATCH 07/11] y2038: syscalls: rename y2038 compat syscalls

On Thu, Jan 10, 2019 at 06:22:12PM +0100, Arnd Bergmann wrote:
> diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
> index f84ea364a302..b3199a744731 100644
> --- a/arch/s390/kernel/syscalls/syscall.tbl
> +++ b/arch/s390/kernel/syscalls/syscall.tbl
> @@ -20,7 +20,7 @@
>  10   common	unlink			sys_unlink			compat_sys_unlink
>  11   common	execve			sys_execve			compat_sys_execve
>  12   common	chdir			sys_chdir			compat_sys_chdir
> -13   32		time			-				compat_sys_time
> +13   32		time			-				sys_time32
>  14   common	mknod			sys_mknod			compat_sys_mknod
>  15   common	chmod			sys_chmod			compat_sys_chmod
>  16   32		lchown			-				compat_sys_s390_lchown16
> @@ -30,11 +30,11 @@
>  22   common	umount			sys_oldumount			compat_sys_oldumount
>  23   32		setuid			-				compat_sys_s390_setuid16
>  24   32		getuid			-				compat_sys_s390_getuid16
> -25   32		stime			-				compat_sys_stime
> +25   32		stime			-				sys_stime32
>  26   common	ptrace			sys_ptrace			compat_sys_ptrace
>  27   common	alarm			sys_alarm			sys_alarm
>  29   common	pause			sys_pause			sys_pause
> -30   common	utime			sys_utime			compat_sys_utime
> +30   common	utime			sys_utime			sys_utime32
...(and more)...

All of them need compat wrappers to clear the uppermost 33 bits of
user space pointers. I assume there is no new *32 system call which
takes u64/s64 arguments; so the pointers should be the only problem.