mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-13 05:54:23 +08:00
18d122c028
Using compat_alloc_user_space() tends to add complexity to the ioctl handling, so I am trying to remove it everywhere. The two callers in sound/core can rewritten to just call the same code that operates on a kernel pointer as the native handler. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20200918095642.1446243-1-arnd@arndb.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* 32bit -> 64bit ioctl wrapper for hwdep API
|
|
* Copyright (c) by Takashi Iwai <tiwai@suse.de>
|
|
*/
|
|
|
|
/* This file is included from hwdep.c */
|
|
|
|
#include <linux/compat.h>
|
|
|
|
struct snd_hwdep_dsp_image32 {
|
|
u32 index;
|
|
unsigned char name[64];
|
|
u32 image; /* pointer */
|
|
u32 length;
|
|
u32 driver_data;
|
|
} /* don't set packed attribute here */;
|
|
|
|
static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
|
|
struct snd_hwdep_dsp_image32 __user *src)
|
|
{
|
|
struct snd_hwdep_dsp_image info = {};
|
|
compat_caddr_t ptr;
|
|
|
|
if (copy_from_user(&info, src, 4 + 64) ||
|
|
get_user(ptr, &src->image) ||
|
|
get_user(info.length, &src->length) ||
|
|
get_user(info.driver_data, &src->driver_data))
|
|
return -EFAULT;
|
|
info.image = compat_ptr(ptr);
|
|
|
|
return snd_hwdep_dsp_load(hw, &info);
|
|
}
|
|
|
|
enum {
|
|
SNDRV_HWDEP_IOCTL_DSP_LOAD32 = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
|
|
};
|
|
|
|
static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct snd_hwdep *hw = file->private_data;
|
|
void __user *argp = compat_ptr(arg);
|
|
switch (cmd) {
|
|
case SNDRV_HWDEP_IOCTL_PVERSION:
|
|
case SNDRV_HWDEP_IOCTL_INFO:
|
|
case SNDRV_HWDEP_IOCTL_DSP_STATUS:
|
|
return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
|
|
case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
|
|
return snd_hwdep_dsp_load_compat(hw, argp);
|
|
}
|
|
if (hw->ops.ioctl_compat)
|
|
return hw->ops.ioctl_compat(hw, file, cmd, arg);
|
|
return -ENOIOCTLCMD;
|
|
}
|