From patchwork Tue Sep 13 20:10:06 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepa Dinamani X-Patchwork-Id: 9329901 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id AB04B60231 for ; Tue, 13 Sep 2016 20:10:29 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88F6E29636 for ; Tue, 13 Sep 2016 20:10:29 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7D0C529644; Tue, 13 Sep 2016 20:10:29 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3675929636 for ; Tue, 13 Sep 2016 20:10:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760265AbcIMUK1 (ORCPT ); Tue, 13 Sep 2016 16:10:27 -0400 Received: from mail-pa0-f65.google.com ([209.85.220.65]:34730 "EHLO mail-pa0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1760213AbcIMUK0 (ORCPT ); Tue, 13 Sep 2016 16:10:26 -0400 Received: by mail-pa0-f65.google.com with SMTP id ph5so21233pab.1; Tue, 13 Sep 2016 13:10:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=U67UHJ51sPjmgXj4wXRA6oEfshhpV9sAx6Tk4514Dow=; b=yfCEGnqnzEsDVllvY2kU683YFZIQNaPGjnsAp4xh7YSMy9Y9ZBVqiDmQexSSH5fsx6 YnLE4KfmYH3MUQc7FuyWiJVte6jXZK/cPgSXMB5IPThxRweChH0tjtyWXL+OilbJlgtY g3XVPmpqJeNbz3FbDpXWiYvHfvWHoT/umcakQVogKWjUosSPqAmlBtzuW1EE7ZBjJ8FZ NoMOZZbPzCp0/FrGbviFnPm4KbnzK0Rt76BKmdf0CCcoN68ksnsLhCYs/7q+pdvQKDjy 5yXMtppPyQLpxwYzL4s8o7j88WAlWirpVJtudAJ+Q/5hzN/u8mSB5BBNZnMjNXHyBLd5 Ic6w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=U67UHJ51sPjmgXj4wXRA6oEfshhpV9sAx6Tk4514Dow=; b=cFKyvwrVL+qokAO/k0T7hEmcmfH2YpeeSqGCxN03riwGOxB2y1Em54wCI9cgjfxzr2 vVuSIZbz6p13j7UcwNwg56u5VmFJI7VUGd4UKlhFimF1s76+uYyNhHWt5wc7JeexqQy9 3P6VVtsNos3f/uxpRS1/IO+fTJtOehOvc4SHXv6HRiNQVi+HiSY+Ucqjt/ripluYaG2u oHgWRrdVFVG18BEYOnc1CJTiXj8SWUA9FtjIrgueAvvOAeVy+zdfQ0/48Nk8pastVwPa tDN3E1Gu+sJ/xYEy1ysR/ebE7s1rn4fzwHOUPJV1FQjGD7MzDGB/zLUtxyWEpdm1/IMb SePw== X-Gm-Message-State: AE9vXwPb+uZ+2fppoPVju0MJbwOkt8W1XxSuIulmf2YBaIupc3pKiUY/AeFFuRsTt2Bi/A== X-Received: by 10.66.26.77 with SMTP id j13mr4547193pag.129.1473797425678; Tue, 13 Sep 2016 13:10:25 -0700 (PDT) Received: from localhost.localdomain ([2620:15c:2c3:fd00:3862:3238:dafb:7d5f]) by smtp.gmail.com with ESMTPSA id i135sm32346131pfe.17.2016.09.13.13.10.24 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 13 Sep 2016 13:10:25 -0700 (PDT) From: Deepa Dinamani To: dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Cc: arnd@arndb.de, y2038@lists.linaro.org Subject: [PATCH 3/4] input: Deprecate real timestamps beyond year 2106 Date: Tue, 13 Sep 2016 13:10:06 -0700 Message-Id: <1473797406-13286-1-git-send-email-deepa.kernel@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP struct timeval is not y2038 safe. All usage of timeval in the kernel will be replaced by y2038 safe structures. struct input_event maintains time for each input event. Real time timestamps are not ideal for input as this time can go backwards as noted in the patch a80b83b7b8 by John Stultz. Hence, having the input_event.time fields only big enough for monotonic and boot times are sufficient. Leave the original input_event as is. This is to maintain backward compatibility with existing userspace interfaces that use input_event. Introduce a new replacement struct raw_input_event. This replaces timeval with struct input_timeval. This structure maintains time in __kernel_ulong_t or compat_ulong_t to allow for architectures to override types as in the case of x32. The change requires any userspace utilities reading or writing from event nodes to update their reading format to match raw_input_event.The changes to the popular libraries will be posted along with the kernel changes. The driver version is also updated to reflect the change in event format. Suggested-by: Arnd Bergmann Signed-off-by: Deepa Dinamani Acked-by: Arnd Bergmann --- Changes from v1 * Fixed the kbuild error * Used __KERNEL__ define as per Arnd's suggestion * Updated comment to indicate the movtivation for ulong types as per Arnd's suggestion. drivers/input/evdev.c | 20 +++++++++---------- drivers/input/input-compat.c | 29 ++++++++++++++------------- drivers/input/input-compat.h | 19 +++++++++++------- drivers/input/misc/uinput.c | 6 +++--- include/linux/uinput.h | 2 +- include/uapi/linux/input.h | 47 ++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 88 insertions(+), 35 deletions(-) diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c index bda2b61..f56188d 100644 --- a/drivers/input/evdev.c +++ b/drivers/input/evdev.c @@ -60,7 +60,7 @@ struct evdev_client { bool revoked; unsigned long *evmasks[EV_CNT]; unsigned int bufsize; - struct input_event buffer[]; + struct raw_input_event buffer[]; }; static size_t evdev_get_mask_cnt(unsigned int type) @@ -113,7 +113,7 @@ static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) unsigned int i, head, num; unsigned int mask = client->bufsize - 1; bool is_report; - struct input_event *ev; + struct raw_input_event *ev; BUG_ON(type == EV_SYN); @@ -155,7 +155,7 @@ static void __evdev_flush_queue(struct evdev_client *client, unsigned int type) static void __evdev_queue_syn_dropped(struct evdev_client *client) { - struct input_event ev; + struct raw_input_event ev; ktime_t time; struct timespec64 ts; @@ -232,7 +232,7 @@ static int evdev_set_clk_type(struct evdev_client *client, unsigned int clkid) } static void __pass_event(struct evdev_client *client, - const struct input_event *event) + const struct raw_input_event *event) { client->buffer[client->head++] = *event; client->head &= client->bufsize - 1; @@ -264,7 +264,7 @@ static void evdev_pass_values(struct evdev_client *client, { struct evdev *evdev = client->evdev; const struct input_value *v; - struct input_event event; + struct raw_input_event event; struct timespec64 ts; bool wakeup = false; @@ -504,7 +504,7 @@ static int evdev_open(struct inode *inode, struct file *file) struct evdev *evdev = container_of(inode->i_cdev, struct evdev, cdev); unsigned int bufsize = evdev_compute_buffer_size(evdev->handle.dev); unsigned int size = sizeof(struct evdev_client) + - bufsize * sizeof(struct input_event); + bufsize * sizeof(struct raw_input_event); struct evdev_client *client; int error; @@ -539,7 +539,7 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer, { struct evdev_client *client = file->private_data; struct evdev *evdev = client->evdev; - struct input_event event; + struct raw_input_event event; int retval = 0; if (count != 0 && count < input_event_size()) @@ -572,7 +572,7 @@ static ssize_t evdev_write(struct file *file, const char __user *buffer, } static int evdev_fetch_next_event(struct evdev_client *client, - struct input_event *event) + struct raw_input_event *event) { int have_event; @@ -594,7 +594,7 @@ static ssize_t evdev_read(struct file *file, char __user *buffer, { struct evdev_client *client = file->private_data; struct evdev *evdev = client->evdev; - struct input_event event; + struct raw_input_event event; size_t read = 0; int error; @@ -1080,7 +1080,7 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd, switch (cmd) { case EVIOCGVERSION: - return put_user(EV_VERSION, ip); + return put_user(EV_VERSION_1_2, ip); case EVIOCGID: if (copy_to_user(p, &dev->id, sizeof(struct input_id))) diff --git a/drivers/input/input-compat.c b/drivers/input/input-compat.c index d84d20b..b58d35c 100644 --- a/drivers/input/input-compat.c +++ b/drivers/input/input-compat.c @@ -15,13 +15,13 @@ #ifdef CONFIG_COMPAT int input_event_from_user(const char __user *buffer, - struct input_event *event) + struct raw_input_event *event) { - if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { - struct input_event_compat compat_event; + if (in_compat_syscall()) { + struct raw_input_event_compat compat_event; if (copy_from_user(&compat_event, buffer, - sizeof(struct input_event_compat))) + sizeof(struct raw_input_event_compat))) return -EFAULT; event->time.tv_sec = compat_event.time.tv_sec; @@ -31,7 +31,8 @@ int input_event_from_user(const char __user *buffer, event->value = compat_event.value; } else { - if (copy_from_user(event, buffer, sizeof(struct input_event))) + if (copy_from_user(event, buffer, + sizeof(struct raw_input_event))) return -EFAULT; } @@ -39,10 +40,10 @@ int input_event_from_user(const char __user *buffer, } int input_event_to_user(char __user *buffer, - const struct input_event *event) + const struct raw_input_event *event) { - if (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { - struct input_event_compat compat_event; + if (in_compat_syscall()) { + struct raw_input_event_compat compat_event; compat_event.time.tv_sec = event->time.tv_sec; compat_event.time.tv_usec = event->time.tv_usec; @@ -51,11 +52,11 @@ int input_event_to_user(char __user *buffer, compat_event.value = event->value; if (copy_to_user(buffer, &compat_event, - sizeof(struct input_event_compat))) + sizeof(struct raw_input_event_compat))) return -EFAULT; } else { - if (copy_to_user(buffer, event, sizeof(struct input_event))) + if (copy_to_user(buffer, event, sizeof(struct raw_input_event))) return -EFAULT; } @@ -100,18 +101,18 @@ int input_ff_effect_from_user(const char __user *buffer, size_t size, #else int input_event_from_user(const char __user *buffer, - struct input_event *event) + struct raw_input_event *event) { - if (copy_from_user(event, buffer, sizeof(struct input_event))) + if (copy_from_user(event, buffer, sizeof(struct raw_input_event))) return -EFAULT; return 0; } int input_event_to_user(char __user *buffer, - const struct input_event *event) + const struct raw_input_event *event) { - if (copy_to_user(buffer, event, sizeof(struct input_event))) + if (copy_to_user(buffer, event, sizeof(struct raw_input_event))) return -EFAULT; return 0; diff --git a/drivers/input/input-compat.h b/drivers/input/input-compat.h index 1563160..c18132d 100644 --- a/drivers/input/input-compat.h +++ b/drivers/input/input-compat.h @@ -17,8 +17,13 @@ #ifdef CONFIG_COMPAT -struct input_event_compat { - struct compat_timeval time; +struct input_timeval_compat { + compat_ulong_t tv_sec; + compat_ulong_t tv_usec; +}; + +struct raw_input_event_compat { + struct input_timeval_compat time; __u16 type; __u16 code; __s32 value; @@ -55,24 +60,24 @@ struct ff_effect_compat { static inline size_t input_event_size(void) { - return (in_compat_syscall() && !COMPAT_USE_64BIT_TIME) ? - sizeof(struct input_event_compat) : sizeof(struct input_event); + return in_compat_syscall() ? sizeof(struct raw_input_event_compat) : + sizeof(struct raw_input_event); } #else static inline size_t input_event_size(void) { - return sizeof(struct input_event); + return sizeof(struct raw_input_event); } #endif /* CONFIG_COMPAT */ int input_event_from_user(const char __user *buffer, - struct input_event *event); + struct raw_input_event *event); int input_event_to_user(char __user *buffer, - const struct input_event *event); + const struct raw_input_event *event); int input_ff_effect_from_user(const char __user *buffer, size_t size, struct ff_effect *effect); diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c index ae22927..993bd24 100644 --- a/drivers/input/misc/uinput.c +++ b/drivers/input/misc/uinput.c @@ -564,7 +564,7 @@ static int uinput_setup_device_legacy(struct uinput_device *udev, static ssize_t uinput_inject_events(struct uinput_device *udev, const char __user *buffer, size_t count) { - struct input_event ev; + struct raw_input_event ev; size_t bytes = 0; if (count != 0 && count < input_event_size()) @@ -610,7 +610,7 @@ static ssize_t uinput_write(struct file *file, const char __user *buffer, } static bool uinput_fetch_next_event(struct uinput_device *udev, - struct input_event *event) + struct raw_input_event *event) { bool have_event; @@ -630,7 +630,7 @@ static bool uinput_fetch_next_event(struct uinput_device *udev, static ssize_t uinput_events_to_user(struct uinput_device *udev, char __user *buffer, size_t count) { - struct input_event event; + struct raw_input_event event; size_t read = 0; while (read + input_event_size() <= count && diff --git a/include/linux/uinput.h b/include/linux/uinput.h index 6527fb7..d1accb3 100644 --- a/include/linux/uinput.h +++ b/include/linux/uinput.h @@ -71,7 +71,7 @@ struct uinput_device { unsigned char ready; unsigned char head; unsigned char tail; - struct input_event buff[UINPUT_BUFFER_SIZE]; + struct raw_input_event buff[UINPUT_BUFFER_SIZE]; int clk_type; unsigned int ff_effects_max; diff --git a/include/uapi/linux/input.h b/include/uapi/linux/input.h index e794f7b..60d5869 100644 --- a/include/uapi/linux/input.h +++ b/include/uapi/linux/input.h @@ -22,6 +22,29 @@ * The event structure itself */ +/* The time structure for y2038 safe raw_input_event. + * The fields use unsigned types to extend times until + * year 2106 rather than 2038. + */ +struct input_timeval { + __kernel_ulong_t tv_sec; + __kernel_ulong_t tv_usec; +}; + +struct raw_input_event { + struct input_timeval time; + __u16 type; + __u16 code; + __s32 value; +}; + +#ifndef __KERNEL__ + +/* Userspace structure. + * Definition maintained here for userspace that is not yet updated to use + * struct raw_input_event. + * Not to be used anywhere within the kernel. + */ struct input_event { struct timeval time; __u16 type; @@ -29,11 +52,35 @@ struct input_event { __s32 value; }; + +static inline void +raw_input_to_input_event(struct raw_input_event *raw, struct input_event *ev) +{ + ev->time.tv_sec = raw->time.tv_sec; + ev->time.tv_usec = raw->time.tv_usec; + ev->type = raw->type; + ev->code = raw->code; + ev->value = raw->value; +} + +static inline void +input_to_raw_event(struct input_event *ev, struct raw_input_event *raw) +{ + raw->time.tv_sec = ev->time.tv_sec; + raw->time.tv_usec = ev->time.tv_usec; + raw->type = ev->type; + raw->code = ev->code; + raw->value = ev->value; +} + +#endif + /* * Protocol version. */ #define EV_VERSION 0x010001 +#define EV_VERSION_1_2 0x010002 /* * IOCTLs (0x00 - 0x7f)