LXR linux/sound/core/timer

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *   32bit -> 64bit ioctl wrapper for timer API
   4 *   Copyright (c) by Takashi Iwai <tiwai@suse.de>
   5 */
   6
   7/* This file included from timer.c */
   8
   9#include <linux/compat.h>
  10
  11/*
  12 * ILP32/LP64 has different size for 'long' type. Additionally, the size
  13 * of storage alignment differs depending on architectures. Here, '__packed'
  14 * qualifier is used so that the size of this structure is multiple of 4 and
  15 * it fits to any architectures with 32 bit storage alignment.
  16 */
  17struct snd_timer_gparams32 {
  18        struct snd_timer_id tid;
  19        u32 period_num;
  20        u32 period_den;
  21        unsigned char reserved[32];
  22} __packed;
  23
  24struct snd_timer_info32 {
  25        u32 flags;
  26        s32 card;
  27        unsigned char id[64];
  28        unsigned char name[80];
  29        u32 reserved0;
  30        u32 resolution;
  31        unsigned char reserved[64];
  32};
  33
  34static int snd_timer_user_gparams_compat(struct file *file,
  35                                        struct snd_timer_gparams32 __user *user)
  36{
  37        struct snd_timer_gparams gparams;
  38
  39        if (copy_from_user(&gparams.tid, &user->tid, sizeof(gparams.tid)) ||
  40            get_user(gparams.period_num, &user->period_num) ||
  41            get_user(gparams.period_den, &user->period_den))
  42                return -EFAULT;
  43
  44        return timer_set_gparams(&gparams);
  45}
  46
  47static int snd_timer_user_info_compat(struct file *file,
  48                                      struct snd_timer_info32 __user *_info)
  49{
  50        struct snd_timer_user *tu;
  51        struct snd_timer_info32 info;
  52        struct snd_timer *t;
  53
  54        tu = file->private_data;
  55        if (!tu->timeri)
  56                return -EBADFD;
  57        t = tu->timeri->timer;
  58        if (!t)
  59                return -EBADFD;
  60        memset(&info, 0, sizeof(info));
  61        info.card = t->card ? t->card->number : -1;
  62        if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
  63                info.flags |= SNDRV_TIMER_FLG_SLAVE;
  64        strlcpy(info.id, t->id, sizeof(info.id));
  65        strlcpy(info.name, t->name, sizeof(info.name));
  66        info.resolution = t->hw.resolution;
  67        if (copy_to_user(_info, &info, sizeof(*_info)))
  68                return -EFAULT;
  69        return 0;
  70}
  71
  72struct snd_timer_status32 {
  73        struct compat_timespec tstamp;
  74        u32 resolution;
  75        u32 lost;
  76        u32 overrun;
  77        u32 queue;
  78        unsigned char reserved[64];
  79};
  80
  81static int snd_timer_user_status_compat(struct file *file,
  82                                        struct snd_timer_status32 __user *_status)
  83{
  84        struct snd_timer_user *tu;
  85        struct snd_timer_status32 status;
  86        
  87        tu = file->private_data;
  88        if (!tu->timeri)
  89                return -EBADFD;
  90        memset(&status, 0, sizeof(status));
  91        status.tstamp.tv_sec = tu->tstamp.tv_sec;
  92        status.tstamp.tv_nsec = tu->tstamp.tv_nsec;
  93        status.resolution = snd_timer_resolution(tu->timeri);
  94        status.lost = tu->timeri->lost;
  95        status.overrun = tu->overrun;
  96        spin_lock_irq(&tu->qlock);
  97        status.queue = tu->qused;
  98        spin_unlock_irq(&tu->qlock);
  99        if (copy_to_user(_status, &status, sizeof(status)))
 100                return -EFAULT;
 101        return 0;
 102}
 103
 104#ifdef CONFIG_X86_X32
 105/* X32 ABI has the same struct as x86-64 */
 106#define snd_timer_user_status_x32(file, s) \
 107        snd_timer_user_status(file, s)
 108#endif /* CONFIG_X86_X32 */
 109
 110/*
 111 */
 112
 113enum {
 114        SNDRV_TIMER_IOCTL_GPARAMS32 = _IOW('T', 0x04, struct snd_timer_gparams32),
 115        SNDRV_TIMER_IOCTL_INFO32 = _IOR('T', 0x11, struct snd_timer_info32),
 116        SNDRV_TIMER_IOCTL_STATUS32 = _IOW('T', 0x14, struct snd_timer_status32),
 117#ifdef CONFIG_X86_X32
 118        SNDRV_TIMER_IOCTL_STATUS_X32 = _IOW('T', 0x14, struct snd_timer_status),
 119#endif /* CONFIG_X86_X32 */
 120};
 121
 122static long __snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
 123                                          unsigned long arg)
 124{
 125        void __user *argp = compat_ptr(arg);
 126
 127        switch (cmd) {
 128        case SNDRV_TIMER_IOCTL_PVERSION:
 129        case SNDRV_TIMER_IOCTL_TREAD:
 130        case SNDRV_TIMER_IOCTL_GINFO:
 131        case SNDRV_TIMER_IOCTL_GSTATUS:
 132        case SNDRV_TIMER_IOCTL_SELECT:
 133        case SNDRV_TIMER_IOCTL_PARAMS:
 134        case SNDRV_TIMER_IOCTL_START:
 135        case SNDRV_TIMER_IOCTL_START_OLD:
 136        case SNDRV_TIMER_IOCTL_STOP:
 137        case SNDRV_TIMER_IOCTL_STOP_OLD:
 138        case SNDRV_TIMER_IOCTL_CONTINUE:
 139        case SNDRV_TIMER_IOCTL_CONTINUE_OLD:
 140        case SNDRV_TIMER_IOCTL_PAUSE:
 141        case SNDRV_TIMER_IOCTL_PAUSE_OLD:
 142        case SNDRV_TIMER_IOCTL_NEXT_DEVICE:
 143                return __snd_timer_user_ioctl(file, cmd, (unsigned long)argp);
 144        case SNDRV_TIMER_IOCTL_GPARAMS32:
 145                return snd_timer_user_gparams_compat(file, argp);
 146        case SNDRV_TIMER_IOCTL_INFO32:
 147                return snd_timer_user_info_compat(file, argp);
 148        case SNDRV_TIMER_IOCTL_STATUS32:
 149                return snd_timer_user_status_compat(file, argp);
 150#ifdef CONFIG_X86_X32
 151        case SNDRV_TIMER_IOCTL_STATUS_X32:
 152                return snd_timer_user_status_x32(file, argp);
 153#endif /* CONFIG_X86_X32 */
 154        }
 155        return -ENOIOCTLCMD;
 156}
 157
 158static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
 159                                        unsigned long arg)
 160{
 161        struct snd_timer_user *tu = file->private_data;
 162        long ret;
 163
 164        mutex_lock(&tu->ioctl_lock);
 165        ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
 166        mutex_unlock(&tu->ioctl_lock);
 167        return ret;
 168}
 169