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Commit 2251fbbc authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: rawmidi: Fix ioctls X32 ABI 



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: default avatarTakashi Iwai <tiwai@suse.de>
parent dd7e3f80

sound/core/rawmidi_compat.c

+53 −0
Original line number Diff line number Diff line
@@ -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;

}