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ALSA: rawmidi: Fix ioctls X32 ABI

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Like the previous fixes for ctl and PCM, we need a fix for
incompatible X32 ABI regarding the rawmidi: namely, struct
snd_rawmidi_status has the timespec, and the size and the alignment on
X32 differ from IA32.

This patch fixes the incompatible ioctl for X32.

Cc: <stable@vger.kernel.org> # v3.4+
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-02-28 11:28:08 +01:00
parent dd7e3f8052
commit 2251fbbc15
1 changed files with 53 additions and 0 deletions
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53
sound/core/rawmidi_compat.c
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@ -93,9 +93,58 @@ static int snd_rawmidi_ioctl_status_compat(struct snd_rawmidi_file *rfile,
return 0;
}
#ifdef CONFIG_X86_X32
/* X32 ABI has 64bit timespec and 64bit alignment */
struct snd_rawmidi_status_x32 {
s32 stream;
u32 rsvd; /* alignment */
struct timespec tstamp;
u32 avail;
u32 xruns;
unsigned char reserved[16];
} __attribute__((packed));
#define put_timespec(src, dst) copy_to_user(dst, src, sizeof(*dst))
static int snd_rawmidi_ioctl_status_x32(struct snd_rawmidi_file *rfile,
struct snd_rawmidi_status_x32 __user *src)
{
int err;
struct snd_rawmidi_status status;
if (rfile->output == NULL)
return -EINVAL;
if (get_user(status.stream, &src->stream))
return -EFAULT;
switch (status.stream) {
case SNDRV_RAWMIDI_STREAM_OUTPUT:
err = snd_rawmidi_output_status(rfile->output, &status);
break;
case SNDRV_RAWMIDI_STREAM_INPUT:
err = snd_rawmidi_input_status(rfile->input, &status);
break;
default:
return -EINVAL;
}
if (err < 0)
return err;
if (put_timespec(&status.tstamp, &src->tstamp) ||
put_user(status.avail, &src->avail) ||
put_user(status.xruns, &src->xruns))
return -EFAULT;
return 0;
}
#endif /* CONFIG_X86_X32 */
enum {
SNDRV_RAWMIDI_IOCTL_PARAMS32 = _IOWR('W', 0x10, struct snd_rawmidi_params32),
SNDRV_RAWMIDI_IOCTL_STATUS32 = _IOWR('W', 0x20, struct snd_rawmidi_status32),
#ifdef CONFIG_X86_X32
SNDRV_RAWMIDI_IOCTL_STATUS_X32 = _IOWR('W', 0x20, struct snd_rawmidi_status_x32),
#endif /* CONFIG_X86_X32 */
};
static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg)
@ -114,6 +163,10 @@ static long snd_rawmidi_ioctl_compat(struct file *file, unsigned int cmd, unsign
return snd_rawmidi_ioctl_params_compat(rfile, argp);
case SNDRV_RAWMIDI_IOCTL_STATUS32:
return snd_rawmidi_ioctl_status_compat(rfile, argp);
#ifdef CONFIG_X86_X32
case SNDRV_RAWMIDI_IOCTL_STATUS_X32:
return snd_rawmidi_ioctl_status_x32(rfile, argp);
#endif /* CONFIG_X86_X32 */
}
return -ENOIOCTLCMD;
}