From patchwork Wed Apr 17 20:56:11 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 1087221 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=arndb.de Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 44kvh62j3Mz9s00 for ; Thu, 18 Apr 2019 06:57:42 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387691AbfDQU5i (ORCPT ); Wed, 17 Apr 2019 16:57:38 -0400 Received: from mout.kundenserver.de ([212.227.126.134]:45069 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727013AbfDQU5h (ORCPT ); Wed, 17 Apr 2019 16:57:37 -0400 Received: from wuerfel.lan ([149.172.19.189]) by mrelayeu.kundenserver.de (mreue010 [212.227.15.129]) with ESMTPA (Nemesis) id 1MkHhB-1gahF83LpJ-00keJw; Wed, 17 Apr 2019 22:57:03 +0200 From: Arnd Bergmann To: netdev@vger.kernel.org Cc: y2038@lists.linaro.org, Willem de Bruijn , Deepa Dinamani , Arnd Bergmann , Richard Henderson , Ivan Kokshaysky , Matt Turner , Ralf Baechle , Paul Burton , James Hogan , Yoshinori Sato , Rich Felker , Chris Zankel , Max Filippov , "David S. Miller" , Willem de Bruijn , linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-sh@vger.kernel.org, linux-arch@vger.kernel.org Subject: [PATCH 3/3 v3] net: socket: implement 64-bit timestamps Date: Wed, 17 Apr 2019 22:56:11 +0200 Message-Id: <20190417205659.2036372-1-arnd@arndb.de> X-Mailer: git-send-email 2.20.0 In-Reply-To: <20190417205404.1877560-1-arnd@arndb.de> References: <20190417205404.1877560-1-arnd@arndb.de> MIME-Version: 1.0 X-Provags-ID: V03:K1:fLF87FKLhuibjNxg7ic7AvBqD7egtFNp7l4yl8HevvFIw+EAQdl Pf/SYEW0fqYsY7Ki84lr2ZHF0nWMCp0ARmuojW2l/ijkbH4FhqMjrHuJxS6CARjyY57wKlT hFLJHN0bqADJAZGeaYXQ/at0BGDxxtRgRvfey2DYFlCpofbSPQAWL5/4Mf9OKNWGekQ6SLK GNz4EEHIhKJPrlPEJTHKg== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1; V03:K0:wNlTYIhQd8k=:l7V9cMDpW13sHhKeY2PaXI 7qgWSOMERym/jZRRts6DCxKtziMd1JOWaQO339u0rRJ0w4pxvpKupoInWlkKu7d7W7wBEYKYl pbV+hyb9rUu1iCd2K5EJScfNn6HvDUvbY6b+8yNBKuF4+Gicj/C+15Gqf7DrZHG5dUZ2NbqC7 e0BDZ3zsbCwtp1LCteZVH2IFxY64DDlWkkxd8HbcOYRiN9MCgr0aj2flpRSuS6ftwGUKzHqNT 4DIRWbSXKapdrt4UFelupGbSfcufv1WaY8DyJX4TzRM9s2rinB6HMTuUWFoeVO0hPShlFI7KC +p/B0Gnb/nVjhekCIftV21COD85pPs/5xPjcJSHZh/IPygq8ZrbWJ5IOEMJYeUIuAOhr28Xmr WiRiSQKt1ZINYPSUIUpSFegSn18Wqddp0q9RjY2zNRP9mm9gXLHqKkK7t63AqpKP1E47yO++A 6Wx6uZnzVIol/WKSW3WWHIh6hKBYtqv2+gadtNPkjdhGAVLsFSLZ9wR9Z/YAfUM4kUIEgA0iR wYz5nUUYgZnjUAG7c+o7+VrDWqG2Wq0sLpPDthO8hin3iKR4p1aO+SqUBNGDYMXhVnHE//6wS +ChR36qIowB4f4/NJUeAx9LRzwHPDsD+3iHacmy0FizDAbhlQKYH70D/uRsRlc3Qmwu181cBx dJzUgXs0E/xLW2t3nKfV+foyfJ2FnRjqd0V4SH8pbCXL8XxQY3cI8vV362JYc/FZGYvnww3Jd 9QpljfsmdlVTC8tf+05PDK0v7HYZo6VFSmxLTQ== Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The 'timeval' and 'timespec' data structures used for socket timestamps are going to be redefined in user space based on 64-bit time_t in future versions of the C library to deal with the y2038 overflow problem, which breaks the ABI definition. Unlike many modern ioctl commands, SIOCGSTAMP and SIOCGSTAMPNS do not use the _IOR() macro to encode the size of the transferred data, so it remains ambiguous whether the application uses the old or new layout. The best workaround I could find is rather ugly: we redefine the command code based on the size of the respective data structure with a ternary operator. This lets it get evaluated as late as possible, hopefully after that structure is visible to the caller. We cannot use an #ifdef here, because inux/sockios.h might have been included before any libc header that could determine the size of time_t. The ioctl implementation now interprets the new command codes as always referring to the 64-bit structure on all architectures, while the old architecture specific command code still refers to the old architecture specific layout. The new command number is only used when they are actually different. Signed-off-by: Arnd Bergmann --- v3: no changes since v1 --- arch/alpha/include/uapi/asm/sockios.h | 4 ++-- arch/mips/include/uapi/asm/sockios.h | 4 ++-- arch/sh/include/uapi/asm/sockios.h | 5 +++-- arch/xtensa/include/uapi/asm/sockios.h | 4 ++-- include/uapi/asm-generic/sockios.h | 4 ++-- include/uapi/linux/sockios.h | 21 +++++++++++++++++++++ net/socket.c | 24 ++++++++++++++++++------ 7 files changed, 50 insertions(+), 16 deletions(-) diff --git a/arch/alpha/include/uapi/asm/sockios.h b/arch/alpha/include/uapi/asm/sockios.h index ba287e4b01bf..af92bc27c3be 100644 --- a/arch/alpha/include/uapi/asm/sockios.h +++ b/arch/alpha/include/uapi/asm/sockios.h @@ -11,7 +11,7 @@ #define SIOCSPGRP _IOW('s', 8, pid_t) #define SIOCGPGRP _IOR('s', 9, pid_t) -#define SIOCGSTAMP 0x8906 /* Get stamp (timeval) */ -#define SIOCGSTAMPNS 0x8907 /* Get stamp (timespec) */ +#define SIOCGSTAMP_OLD 0x8906 /* Get stamp (timeval) */ +#define SIOCGSTAMPNS_OLD 0x8907 /* Get stamp (timespec) */ #endif /* _ASM_ALPHA_SOCKIOS_H */ diff --git a/arch/mips/include/uapi/asm/sockios.h b/arch/mips/include/uapi/asm/sockios.h index 5b40a88593fa..66f60234f290 100644 --- a/arch/mips/include/uapi/asm/sockios.h +++ b/arch/mips/include/uapi/asm/sockios.h @@ -21,7 +21,7 @@ #define SIOCSPGRP _IOW('s', 8, pid_t) #define SIOCGPGRP _IOR('s', 9, pid_t) -#define SIOCGSTAMP 0x8906 /* Get stamp (timeval) */ -#define SIOCGSTAMPNS 0x8907 /* Get stamp (timespec) */ +#define SIOCGSTAMP_OLD 0x8906 /* Get stamp (timeval) */ +#define SIOCGSTAMPNS_OLD 0x8907 /* Get stamp (timespec) */ #endif /* _ASM_SOCKIOS_H */ diff --git a/arch/sh/include/uapi/asm/sockios.h b/arch/sh/include/uapi/asm/sockios.h index 17313d2c3527..ef18a668456d 100644 --- a/arch/sh/include/uapi/asm/sockios.h +++ b/arch/sh/include/uapi/asm/sockios.h @@ -10,6 +10,7 @@ #define SIOCSPGRP _IOW('s', 8, pid_t) #define SIOCGPGRP _IOR('s', 9, pid_t) -#define SIOCGSTAMP _IOR('s', 100, struct timeval) /* Get stamp (timeval) */ -#define SIOCGSTAMPNS _IOR('s', 101, struct timespec) /* Get stamp (timespec) */ +#define SIOCGSTAMP_OLD _IOR('s', 100, struct timeval) /* Get stamp (timeval) */ +#define SIOCGSTAMPNS_OLD _IOR('s', 101, struct timespec) /* Get stamp (timespec) */ + #endif /* __ASM_SH_SOCKIOS_H */ diff --git a/arch/xtensa/include/uapi/asm/sockios.h b/arch/xtensa/include/uapi/asm/sockios.h index fb8ac3607189..1a1f58f4b75a 100644 --- a/arch/xtensa/include/uapi/asm/sockios.h +++ b/arch/xtensa/include/uapi/asm/sockios.h @@ -26,7 +26,7 @@ #define SIOCSPGRP _IOW('s', 8, pid_t) #define SIOCGPGRP _IOR('s', 9, pid_t) -#define SIOCGSTAMP 0x8906 /* Get stamp (timeval) */ -#define SIOCGSTAMPNS 0x8907 /* Get stamp (timespec) */ +#define SIOCGSTAMP_OLD 0x8906 /* Get stamp (timeval) */ +#define SIOCGSTAMPNS_OLD 0x8907 /* Get stamp (timespec) */ #endif /* _XTENSA_SOCKIOS_H */ diff --git a/include/uapi/asm-generic/sockios.h b/include/uapi/asm-generic/sockios.h index 64f658c7cec2..44fa3ed70483 100644 --- a/include/uapi/asm-generic/sockios.h +++ b/include/uapi/asm-generic/sockios.h @@ -8,7 +8,7 @@ #define FIOGETOWN 0x8903 #define SIOCGPGRP 0x8904 #define SIOCATMARK 0x8905 -#define SIOCGSTAMP 0x8906 /* Get stamp (timeval) */ -#define SIOCGSTAMPNS 0x8907 /* Get stamp (timespec) */ +#define SIOCGSTAMP_OLD 0x8906 /* Get stamp (timeval) */ +#define SIOCGSTAMPNS_OLD 0x8907 /* Get stamp (timespec) */ #endif /* __ASM_GENERIC_SOCKIOS_H */ diff --git a/include/uapi/linux/sockios.h b/include/uapi/linux/sockios.h index d393e9ed3964..7d1bccbbef78 100644 --- a/include/uapi/linux/sockios.h +++ b/include/uapi/linux/sockios.h @@ -19,6 +19,7 @@ #ifndef _LINUX_SOCKIOS_H #define _LINUX_SOCKIOS_H +#include #include /* Linux-specific socket ioctls */ @@ -27,6 +28,26 @@ #define SOCK_IOC_TYPE 0x89 +/* + * the timeval/timespec data structure layout is defined by libc, + * so we need to cover both possible versions on 32-bit. + */ +/* Get stamp (timeval) */ +#define SIOCGSTAMP_NEW _IOR(SOCK_IOC_TYPE, 0x06, long long[2]) +/* Get stamp (timespec) */ +#define SIOCGSTAMPNS_NEW _IOR(SOCK_IOC_TYPE, 0x07, long long[2]) + +#if __BITS_PER_LONG == 64 || (defined(__x86_64__) && defined(__ILP32__)) +/* on 64-bit and x32, avoid the ?: operator */ +#define SIOCGSTAMP SIOCGSTAMP_OLD +#define SIOCGSTAMPNS SIOCGSTAMPNS_OLD +#else +#define SIOCGSTAMP ((sizeof(struct timeval)) == 8 ? \ + SIOCGSTAMP_OLD : SIOCGSTAMP_NEW) +#define SIOCGSTAMPNS ((sizeof(struct timespec)) == 8 ? \ + SIOCGSTAMPNS_OLD : SIOCGSTAMPNS_NEW) +#endif + /* Routing table calls. */ #define SIOCADDRT 0x890B /* add routing table entry */ #define SIOCDELRT 0x890C /* delete routing table entry */ diff --git a/net/socket.c b/net/socket.c index ab624d42ead5..8d9d4fc7d962 100644 --- a/net/socket.c +++ b/net/socket.c @@ -1164,14 +1164,24 @@ static long sock_ioctl(struct file *file, unsigned cmd, unsigned long arg) err = open_related_ns(&net->ns, get_net_ns); break; - case SIOCGSTAMP: - case SIOCGSTAMPNS: + case SIOCGSTAMP_OLD: + case SIOCGSTAMPNS_OLD: if (!sock->ops->gettstamp) { err = -ENOIOCTLCMD; break; } err = sock->ops->gettstamp(sock, argp, - cmd == SIOCGSTAMP, false); + cmd == SIOCGSTAMP_OLD, + !IS_ENABLED(CONFIG_64BIT)); + case SIOCGSTAMP_NEW: + case SIOCGSTAMPNS_NEW: + if (!sock->ops->gettstamp) { + err = -ENOIOCTLCMD; + break; + } + err = sock->ops->gettstamp(sock, argp, + cmd == SIOCGSTAMP_NEW, + false); break; default: err = sock_do_ioctl(net, sock, cmd, arg); @@ -3324,11 +3334,11 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, case SIOCADDRT: case SIOCDELRT: return routing_ioctl(net, sock, cmd, argp); - case SIOCGSTAMP: - case SIOCGSTAMPNS: + case SIOCGSTAMP_OLD: + case SIOCGSTAMPNS_OLD: if (!sock->ops->gettstamp) return -ENOIOCTLCMD; - return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP, + return sock->ops->gettstamp(sock, argp, cmd == SIOCGSTAMP_OLD, !COMPAT_USE_64BIT_TIME); case SIOCBONDSLAVEINFOQUERY: @@ -3348,6 +3358,8 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock, case SIOCADDDLCI: case SIOCDELDLCI: case SIOCGSKNS: + case SIOCGSTAMP_NEW: + case SIOCGSTAMPNS_NEW: return sock_ioctl(file, cmd, arg); case SIOCGIFFLAGS: