From patchwork Tue Dec 17 21:19:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arnd Bergmann X-Patchwork-Id: 181911 Delivered-To: patch@linaro.org Received: by 2002:a92:3001:0:0:0:0:0 with SMTP id x1csp6320331ile; Tue, 17 Dec 2019 13:20:12 -0800 (PST) X-Google-Smtp-Source: APXvYqxa43zcqj4l0todc0QEb3O1fIgWgnLU42+nSto7ldI/d8J8sOJJ6b733gpS6zo8dUS3S7x+ X-Received: by 2002:a9d:67c1:: with SMTP id c1mr38356899otn.20.1576617612454; Tue, 17 Dec 2019 13:20:12 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1576617612; cv=none; d=google.com; s=arc-20160816; b=hwoQiiyl6a6KfW8FT3iWn7/JErOHig0hDZMuqgnjobfRq7owwIcuz1/L5doj4NnYUA 04ALTgJn9RmUGEde1E1EAztSl3UweJ+SbYoL6QpIawrsI7TAMPZvy5esu8VG0cE+yLH5 nUeauCNe8Nm+5HIAOOYvCKumkT9x7CwevTJafT2xTrecrNZ01Onee+B/HAxL+ShXQADN T4dWrmBuehV9E4aVOWm+xVyblMBArHU6L4EHM3hsGq1E91HrZUL+VXspPT7FvHbZZhrH abbB00jEd9xioY/HQ7WlGedU/mdK1iV93gpKmoRaZltwwq6XWHKsr7vaKBDJ6FheBh5d +olQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from; bh=I7k241n4cnNH2+wiAqdcg2tzipW2KkDpdGAQNSEhjKc=; b=X9/XQE2gifbWyaP60WEiEUYQwfP67f+GnovB/nuwaE90RfHEPh7PdApKH7ste1Kbt2 M1Kkn1Ds7+TVXsBymxFwYU9DcEKnZZ3QIISz3jl3+bvG1gBLi7DsyeeEemMlN9mBtNwK kanoArBiP/B86l0KTmqYJAhgO4cvLNKSaFnUFhlbpSg8ko6/ojF46+vZGnIPUydeqG4h c/Os1P0QaQ3DvFz+i2Kh/8LKKcGwDwKQWBjD0oP+EyFyk4/KPUDykR5ideuXjcJba+JA +M7czkQYtJodsgrHRMu+kd+3yjUVLjnVz99YYsg0eHYSaw2+cL2wilfiHsGiOYGvqLZC 6ZsA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id x26si12855775oie.58.2019.12.17.13.20.12; Tue, 17 Dec 2019 13:20:12 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727726AbfLQVUL (ORCPT + 27 others); Tue, 17 Dec 2019 16:20:11 -0500 Received: from mout.kundenserver.de ([212.227.17.10]:40149 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726764AbfLQVUK (ORCPT ); Tue, 17 Dec 2019 16:20:10 -0500 Received: from threadripper.lan ([149.172.19.189]) by mrelayeu.kundenserver.de (mreue106 [212.227.15.145]) with ESMTPA (Nemesis) id 1MVMNF-1iIGKK24gx-00SNMz; Tue, 17 Dec 2019 22:19:23 +0100 From: Arnd Bergmann To: Takashi Iwai Cc: Baolin Wang , Arnd Bergmann , Jaroslav Kysela , Richard Fontana , alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org Subject: [PATCH v8 6/9] ALSA: Avoid using timespec for struct snd_timer_tread Date: Tue, 17 Dec 2019 22:19:00 +0100 Message-Id: <20191217211921.33961-1-arnd@arndb.de> X-Mailer: git-send-email 2.20.0 MIME-Version: 1.0 X-Provags-ID: V03:K1:pI60TNbAz0BmL9hFrNsFY2HxG4XXMr8WgstFyxbnXXnHYypRkZj +/+zrMW2RLdurGBE8YInozBE7PvKnd/MHMIo6nVZATZPImdQf3n21828xhDQbMztcioewaE d2QGPQy2gr+pgCki9U911qUyHB7sdXuK6zpk0/MqbsSvC2BAkrF55FSxwHas/SStO2wM0V1 Vi/rd/UIeBJEBhBiz70KA== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1; V03:K0:bIR+eWgAX4k=:9DQ5rOLHd5j1/57AVb1Yum TRTx5aKTL4O0lMgTfvw6puWey+ADHMPfE6ghpDZ+J5MmUxPniQ8+qTfelKkz3clOulWjFpoPX SXwKigSOUC1oHJa5CVajldbzxwcrFup4KM2uvUsjdS+cM26d5KcpcijnffE6oY4WOM5okKICv HejBPoSvN+rw+r084izaoOZlrfWBK45L3K8ELZyj7WxD7YDZAHfXz7o2ttczcAsAOuQGbraNn aByIKn+XH1x/zclCeBO5YPN1uH1Qzpf4Lhn5yLvZJFvc6NEtS634tbjqr/LrSyu11KRxzIZx2 DBH6ok7YU4iwDTcmglF7ydtSC4X7caGZ3DazDmi0ZW93zqtwRmBnqTcl7YXmeOzZaYX79ogo+ Mv8C1iClC/AT5QsqcZ9AAHciucPmFXEDZJMfborUNyiRlqVpWQlQY3zL+iucwC0OVZXnsl4Bh gqaV990Zt3HkxE6ALq1TCUlbrG4q0WzXarcijSacZ/F/gf06gOBmXmqzcdGp7kMUYbUIsI3Mr 6zVabreKIXXs3bHHiJxOckkFFssWs9BBK40wEdngA06Ez++tU3Vq9Pxat2kiweIcCbC5I7PNg GaU6U7XFpA5nx/NDi27wBcFC3abNi0QScaC38rXfius7zz9w94MihozS6n86iLyVNSuTLeA68 BMQX27EuSCfKLTl00TSgEweGESaR709W5l09TcMx6xI7gG6aKBoqfMl8kAA4v7IsJwyxUyv73 ox0yuYo3ca25xhiqPlqIyHizExcZYPmk1QQUvy/BHgWvv+OgQR+VZXfd7+2EzcWwLW+Qpq0p9 +RI+t0Nnlr8m+CfbBtcZHr1OwN2BJDKH4xkEdX5ug4ZeqCuDxjyR27UGbdi30jqPt5FJeDCbN MtklFhpdblJ4q2xX5JVw== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Baolin Wang The struct snd_timer_tread will use 'timespec' type variables to record timestamp, which is not year 2038 safe on 32bits system. Since the struct snd_timer_tread is passed through read() rather than ioctl(), and the read syscall has no command number that lets us pick between the 32-bit or 64-bit version of this structure. Thus we introduced one new command SNDRV_TIMER_IOCTL_TREAD64 and new struct snd_timer_tread64 replacing timespec with s64 type to handle 64bit time_t. That means we will set tu->tread = TREAD_FORMAT_64BIT when user space has a 64bit time_t, then we will copy to user with struct snd_timer_tread64. Otherwise we will use 32bit time_t variables when copying to user. Moreover this patch replaces timespec type with timespec64 type and related y2038 safe APIs. Signed-off-by: Baolin Wang Signed-off-by: Arnd Bergmann --- This v8 is what is in the pull request "[GIT PULL, v8] Fix year 2038 issue for sound subsystem", posted here for reference include/uapi/sound/asound.h | 15 +++- sound/core/timer.c | 150 +++++++++++++++++++++++++++--------- sound/core/timer_compat.c | 5 +- 3 files changed, 131 insertions(+), 39 deletions(-) -- 2.20.0 diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index e0ada33afa1e..ad86c5a7a1e2 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -783,7 +783,7 @@ struct snd_timer_status { #define SNDRV_TIMER_IOCTL_PVERSION _IOR('T', 0x00, int) #define SNDRV_TIMER_IOCTL_NEXT_DEVICE _IOWR('T', 0x01, struct snd_timer_id) -#define SNDRV_TIMER_IOCTL_TREAD _IOW('T', 0x02, int) +#define SNDRV_TIMER_IOCTL_TREAD_OLD _IOW('T', 0x02, int) #define SNDRV_TIMER_IOCTL_GINFO _IOWR('T', 0x03, struct snd_timer_ginfo) #define SNDRV_TIMER_IOCTL_GPARAMS _IOW('T', 0x04, struct snd_timer_gparams) #define SNDRV_TIMER_IOCTL_GSTATUS _IOWR('T', 0x05, struct snd_timer_gstatus) @@ -796,6 +796,15 @@ struct snd_timer_status { #define SNDRV_TIMER_IOCTL_STOP _IO('T', 0xa1) #define SNDRV_TIMER_IOCTL_CONTINUE _IO('T', 0xa2) #define SNDRV_TIMER_IOCTL_PAUSE _IO('T', 0xa3) +#define SNDRV_TIMER_IOCTL_TREAD64 _IOW('T', 0xa4, int) + +#if __BITS_PER_LONG == 64 +#define SNDRV_TIMER_IOCTL_TREAD SNDRV_TIMER_IOCTL_TREAD_OLD +#else +#define SNDRV_TIMER_IOCTL_TREAD ((sizeof(__kernel_long_t) >= sizeof(time_t)) ? \ + SNDRV_TIMER_IOCTL_TREAD_OLD : \ + SNDRV_TIMER_IOCTL_TREAD64) +#endif struct snd_timer_read { unsigned int resolution; @@ -821,11 +830,15 @@ enum { SNDRV_TIMER_EVENT_MRESUME = SNDRV_TIMER_EVENT_RESUME + 10, }; +#ifndef __KERNEL__ struct snd_timer_tread { int event; + __time_pad pad1; struct timespec tstamp; unsigned int val; + __time_pad pad2; }; +#endif /**************************************************************************** * * diff --git a/sound/core/timer.c b/sound/core/timer.c index d2f69039f941..4cfd8e691903 100644 --- a/sound/core/timer.c +++ b/sound/core/timer.c @@ -44,6 +44,28 @@ MODULE_PARM_DESC(timer_tstamp_monotonic, "Use posix monotonic clock source for t MODULE_ALIAS_CHARDEV(CONFIG_SND_MAJOR, SNDRV_MINOR_TIMER); MODULE_ALIAS("devname:snd/timer"); +enum timer_tread_format { + TREAD_FORMAT_NONE = 0, + TREAD_FORMAT_TIME64, + TREAD_FORMAT_TIME32, +}; + +struct snd_timer_tread32 { + int event; + s32 tstamp_sec; + s32 tstamp_nsec; + unsigned int val; +}; + +struct snd_timer_tread64 { + int event; + u8 pad1[4]; + s64 tstamp_sec; + s64 tstamp_nsec; + unsigned int val; + u8 pad2[4]; +}; + struct snd_timer_user { struct snd_timer_instance *timeri; int tread; /* enhanced read with timestamps and events */ @@ -55,7 +77,7 @@ struct snd_timer_user { int queue_size; bool disconnected; struct snd_timer_read *queue; - struct snd_timer_tread *tqueue; + struct snd_timer_tread64 *tqueue; spinlock_t qlock; unsigned long last_resolution; unsigned int filter; @@ -1329,7 +1351,7 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri, } static void snd_timer_user_append_to_tqueue(struct snd_timer_user *tu, - struct snd_timer_tread *tread) + struct snd_timer_tread64 *tread) { if (tu->qused >= tu->queue_size) { tu->overrun++; @@ -1346,7 +1368,7 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, unsigned long resolution) { struct snd_timer_user *tu = timeri->callback_data; - struct snd_timer_tread r1; + struct snd_timer_tread64 r1; unsigned long flags; if (event >= SNDRV_TIMER_EVENT_START && @@ -1356,7 +1378,8 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri, return; memset(&r1, 0, sizeof(r1)); r1.event = event; - r1.tstamp = timespec64_to_timespec(*tstamp); + r1.tstamp_sec = tstamp->tv_sec; + r1.tstamp_nsec = tstamp->tv_nsec; r1.val = resolution; spin_lock_irqsave(&tu->qlock, flags); snd_timer_user_append_to_tqueue(tu, &r1); @@ -1378,7 +1401,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, unsigned long ticks) { struct snd_timer_user *tu = timeri->callback_data; - struct snd_timer_tread *r, r1; + struct snd_timer_tread64 *r, r1; struct timespec64 tstamp; int prev, append = 0; @@ -1399,7 +1422,8 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) && tu->last_resolution != resolution) { r1.event = SNDRV_TIMER_EVENT_RESOLUTION; - r1.tstamp = timespec64_to_timespec(tstamp); + r1.tstamp_sec = tstamp.tv_sec; + r1.tstamp_nsec = tstamp.tv_nsec; r1.val = resolution; snd_timer_user_append_to_tqueue(tu, &r1); tu->last_resolution = resolution; @@ -1413,14 +1437,16 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1; r = &tu->tqueue[prev]; if (r->event == SNDRV_TIMER_EVENT_TICK) { - r->tstamp = timespec64_to_timespec(tstamp); + r->tstamp_sec = tstamp.tv_sec; + r->tstamp_nsec = tstamp.tv_nsec; r->val += ticks; append++; goto __wake; } } r1.event = SNDRV_TIMER_EVENT_TICK; - r1.tstamp = timespec64_to_timespec(tstamp); + r1.tstamp_sec = tstamp.tv_sec; + r1.tstamp_nsec = tstamp.tv_nsec; r1.val = ticks; snd_timer_user_append_to_tqueue(tu, &r1); append++; @@ -1435,7 +1461,7 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri, static int realloc_user_queue(struct snd_timer_user *tu, int size) { struct snd_timer_read *queue = NULL; - struct snd_timer_tread *tqueue = NULL; + struct snd_timer_tread64 *tqueue = NULL; if (tu->tread) { tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL); @@ -1874,11 +1900,11 @@ static int snd_timer_user_params(struct file *file, tu->qhead = tu->qtail = tu->qused = 0; if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) { if (tu->tread) { - struct snd_timer_tread tread; + struct snd_timer_tread64 tread; memset(&tread, 0, sizeof(tread)); tread.event = SNDRV_TIMER_EVENT_EARLY; - tread.tstamp.tv_sec = 0; - tread.tstamp.tv_nsec = 0; + tread.tstamp_sec = 0; + tread.tstamp_nsec = 0; tread.val = 0; snd_timer_user_append_to_tqueue(tu, &tread); } else { @@ -2008,6 +2034,36 @@ static int snd_timer_user_pause(struct file *file) return 0; } +static int snd_timer_user_tread(void __user *argp, struct snd_timer_user *tu, + unsigned int cmd, bool compat) +{ + int __user *p = argp; + int xarg, old_tread; + + if (tu->timeri) /* too late */ + return -EBUSY; + if (get_user(xarg, p)) + return -EFAULT; + + old_tread = tu->tread; + + if (!xarg) + tu->tread = TREAD_FORMAT_NONE; + else if (cmd == SNDRV_TIMER_IOCTL_TREAD64 || + (IS_ENABLED(CONFIG_64BIT) && !compat)) + tu->tread = TREAD_FORMAT_TIME64; + else + tu->tread = TREAD_FORMAT_TIME32; + + if (tu->tread != old_tread && + realloc_user_queue(tu, tu->queue_size) < 0) { + tu->tread = old_tread; + return -ENOMEM; + } + + return 0; +} + enum { SNDRV_TIMER_IOCTL_START_OLD = _IO('T', 0x20), SNDRV_TIMER_IOCTL_STOP_OLD = _IO('T', 0x21), @@ -2016,7 +2072,7 @@ enum { }; static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, - unsigned long arg) + unsigned long arg, bool compat) { struct snd_timer_user *tu; void __user *argp = (void __user *)arg; @@ -2028,23 +2084,9 @@ static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd, return put_user(SNDRV_TIMER_VERSION, p) ? -EFAULT : 0; case SNDRV_TIMER_IOCTL_NEXT_DEVICE: return snd_timer_user_next_device(argp); - case SNDRV_TIMER_IOCTL_TREAD: - { - int xarg, old_tread; - - if (tu->timeri) /* too late */ - return -EBUSY; - if (get_user(xarg, p)) - return -EFAULT; - old_tread = tu->tread; - tu->tread = xarg ? 1 : 0; - if (tu->tread != old_tread && - realloc_user_queue(tu, tu->queue_size) < 0) { - tu->tread = old_tread; - return -ENOMEM; - } - return 0; - } + case SNDRV_TIMER_IOCTL_TREAD_OLD: + case SNDRV_TIMER_IOCTL_TREAD64: + return snd_timer_user_tread(argp, tu, cmd, compat); case SNDRV_TIMER_IOCTL_GINFO: return snd_timer_user_ginfo(file, argp); case SNDRV_TIMER_IOCTL_GPARAMS: @@ -2084,7 +2126,7 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd, long ret; mutex_lock(&tu->ioctl_lock); - ret = __snd_timer_user_ioctl(file, cmd, arg); + ret = __snd_timer_user_ioctl(file, cmd, arg, false); mutex_unlock(&tu->ioctl_lock); return ret; } @@ -2100,13 +2142,29 @@ static int snd_timer_user_fasync(int fd, struct file * file, int on) static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, size_t count, loff_t *offset) { + struct snd_timer_tread64 *tread; + struct snd_timer_tread32 tread32; struct snd_timer_user *tu; long result = 0, unit; int qhead; int err = 0; tu = file->private_data; - unit = tu->tread ? sizeof(struct snd_timer_tread) : sizeof(struct snd_timer_read); + switch (tu->tread) { + case TREAD_FORMAT_TIME64: + unit = sizeof(struct snd_timer_tread64); + break; + case TREAD_FORMAT_TIME32: + unit = sizeof(struct snd_timer_tread32); + break; + case TREAD_FORMAT_NONE: + unit = sizeof(struct snd_timer_read); + break; + default: + WARN_ONCE(1, "Corrupt snd_timer_user\n"); + return -ENOTSUPP; + } + mutex_lock(&tu->ioctl_lock); spin_lock_irq(&tu->qlock); while ((long)count - result >= unit) { @@ -2145,14 +2203,34 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer, tu->qused--; spin_unlock_irq(&tu->qlock); - if (tu->tread) { - if (copy_to_user(buffer, &tu->tqueue[qhead], - sizeof(struct snd_timer_tread))) + tread = &tu->tqueue[qhead]; + + switch (tu->tread) { + case TREAD_FORMAT_TIME64: + if (copy_to_user(buffer, tread, + sizeof(struct snd_timer_tread64))) err = -EFAULT; - } else { + break; + case TREAD_FORMAT_TIME32: + memset(&tread32, 0, sizeof(tread32)); + tread32 = (struct snd_timer_tread32) { + .event = tread->event, + .tstamp_sec = tread->tstamp_sec, + .tstamp_sec = tread->tstamp_nsec, + .val = tread->val, + }; + + if (copy_to_user(buffer, &tread32, sizeof(tread32))) + err = -EFAULT; + break; + case TREAD_FORMAT_NONE: if (copy_to_user(buffer, &tu->queue[qhead], sizeof(struct snd_timer_read))) err = -EFAULT; + break; + default: + err = -ENOTSUPP; + break; } spin_lock_irq(&tu->qlock); diff --git a/sound/core/timer_compat.c b/sound/core/timer_compat.c index 20eef5bc304b..0103d16f6f9f 100644 --- a/sound/core/timer_compat.c +++ b/sound/core/timer_compat.c @@ -83,7 +83,8 @@ static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, switch (cmd) { case SNDRV_TIMER_IOCTL_PVERSION: - case SNDRV_TIMER_IOCTL_TREAD: + case SNDRV_TIMER_IOCTL_TREAD_OLD: + case SNDRV_TIMER_IOCTL_TREAD64: case SNDRV_TIMER_IOCTL_GINFO: case SNDRV_TIMER_IOCTL_GSTATUS: case SNDRV_TIMER_IOCTL_SELECT: @@ -97,7 +98,7 @@ static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd, case SNDRV_TIMER_IOCTL_PAUSE: case SNDRV_TIMER_IOCTL_PAUSE_OLD: case SNDRV_TIMER_IOCTL_NEXT_DEVICE: - return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp); + return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp, true); case SNDRV_TIMER_IOCTL_GPARAMS32: return snd_timer_user_gparams_compat(file, argp); case SNDRV_TIMER_IOCTL_INFO32: