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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
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/*
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* 32bit -> 64bit ioctl wrapper for hwdep API
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*/
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/* This file is included from hwdep.c */
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#include <linux/compat.h>
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struct snd_hwdep_dsp_image32 {
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u32 index;
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unsigned char name[64];
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u32 image; /* pointer */
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u32 length;
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u32 driver_data;
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} /* don't set packed attribute here */;
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static int snd_hwdep_dsp_load_compat(struct snd_hwdep *hw,
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struct snd_hwdep_dsp_image32 __user *src)
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{
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struct snd_hwdep_dsp_image info = {};
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compat_caddr_t ptr;
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if (copy_from_user(&info, src, 4 + 64) ||
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get_user(ptr, &src->image) ||
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get_user(info.length, &src->length) ||
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get_user(info.driver_data, &src->driver_data))
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return -EFAULT;
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info.image = compat_ptr(ptr);
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return snd_hwdep_dsp_load(hw, &info);
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}
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enum {
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SNDRV_HWDEP_IOCTL_DSP_LOAD32 = _IOW('H', 0x03, struct snd_hwdep_dsp_image32)
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};
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static long snd_hwdep_ioctl_compat(struct file * file, unsigned int cmd,
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unsigned long arg)
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{
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struct snd_hwdep *hw = file->private_data;
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void __user *argp = compat_ptr(arg);
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switch (cmd) {
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case SNDRV_HWDEP_IOCTL_PVERSION:
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case SNDRV_HWDEP_IOCTL_INFO:
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case SNDRV_HWDEP_IOCTL_DSP_STATUS:
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return snd_hwdep_ioctl(file, cmd, (unsigned long)argp);
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case SNDRV_HWDEP_IOCTL_DSP_LOAD32:
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return snd_hwdep_dsp_load_compat(hw, argp);
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}
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if (hw->ops.ioctl_compat)
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return hw->ops.ioctl_compat(hw, file, cmd, arg);
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return -ENOIOCTLCMD;
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}
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