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[media] v4l2-dev: improve ioctl validity checks
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The ioctl validity checks have been improved and now take vfl_type
and vfl_dir into account.
During the 2012 Media Workshop it was decided that these improved
v4l2 core checks should be added as they simplified drivers and
made drivers behave consistently.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
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Hans Verkuil authored and Mauro Carvalho Chehab committed Sep 26, 2012
1 parent 954f340 commit 4b20259
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Showing 2 changed files with 237 additions and 173 deletions.
228 changes: 133 additions & 95 deletions drivers/media/v4l2-core/v4l2-dev.c
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Original file line number Diff line number Diff line change
Expand Up @@ -551,6 +551,11 @@ static void determine_valid_ioctls(struct video_device *vdev)
{
DECLARE_BITMAP(valid_ioctls, BASE_VIDIOC_PRIVATE);
const struct v4l2_ioctl_ops *ops = vdev->ioctl_ops;
bool is_vid = vdev->vfl_type == VFL_TYPE_GRABBER;
bool is_vbi = vdev->vfl_type == VFL_TYPE_VBI;
bool is_radio = vdev->vfl_type == VFL_TYPE_RADIO;
bool is_rx = vdev->vfl_dir != VFL_DIR_TX;
bool is_tx = vdev->vfl_dir != VFL_DIR_RX;

bitmap_zero(valid_ioctls, BASE_VIDIOC_PRIVATE);

Expand All @@ -561,66 +566,87 @@ static void determine_valid_ioctls(struct video_device *vdev)
if (ops->vidioc_s_priority ||
test_bit(V4L2_FL_USE_FH_PRIO, &vdev->flags))
set_bit(_IOC_NR(VIDIOC_S_PRIORITY), valid_ioctls);
if (ops->vidioc_enum_fmt_vid_cap ||
ops->vidioc_enum_fmt_vid_out ||
ops->vidioc_enum_fmt_vid_cap_mplane ||
ops->vidioc_enum_fmt_vid_out_mplane ||
ops->vidioc_enum_fmt_vid_overlay)
set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
if (ops->vidioc_g_fmt_vid_cap ||
ops->vidioc_g_fmt_vid_out ||
ops->vidioc_g_fmt_vid_cap_mplane ||
ops->vidioc_g_fmt_vid_out_mplane ||
ops->vidioc_g_fmt_vid_overlay ||
ops->vidioc_g_fmt_vbi_cap ||
ops->vidioc_g_fmt_vid_out_overlay ||
ops->vidioc_g_fmt_vbi_out ||
ops->vidioc_g_fmt_sliced_vbi_cap ||
ops->vidioc_g_fmt_sliced_vbi_out)
set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
if (ops->vidioc_s_fmt_vid_cap ||
ops->vidioc_s_fmt_vid_out ||
ops->vidioc_s_fmt_vid_cap_mplane ||
ops->vidioc_s_fmt_vid_out_mplane ||
ops->vidioc_s_fmt_vid_overlay ||
ops->vidioc_s_fmt_vbi_cap ||
ops->vidioc_s_fmt_vid_out_overlay ||
ops->vidioc_s_fmt_vbi_out ||
ops->vidioc_s_fmt_sliced_vbi_cap ||
ops->vidioc_s_fmt_sliced_vbi_out)
set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
if (ops->vidioc_try_fmt_vid_cap ||
ops->vidioc_try_fmt_vid_out ||
ops->vidioc_try_fmt_vid_cap_mplane ||
ops->vidioc_try_fmt_vid_out_mplane ||
ops->vidioc_try_fmt_vid_overlay ||
ops->vidioc_try_fmt_vbi_cap ||
ops->vidioc_try_fmt_vid_out_overlay ||
ops->vidioc_try_fmt_vbi_out ||
ops->vidioc_try_fmt_sliced_vbi_cap ||
ops->vidioc_try_fmt_sliced_vbi_out)
set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
if (is_vid) {
if ((is_rx && (ops->vidioc_enum_fmt_vid_cap ||
ops->vidioc_enum_fmt_vid_cap_mplane ||
ops->vidioc_enum_fmt_vid_overlay)) ||
(is_tx && (ops->vidioc_enum_fmt_vid_out ||
ops->vidioc_enum_fmt_vid_out_mplane)))
set_bit(_IOC_NR(VIDIOC_ENUM_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_g_fmt_vid_cap ||
ops->vidioc_g_fmt_vid_cap_mplane ||
ops->vidioc_g_fmt_vid_overlay)) ||
(is_tx && (ops->vidioc_g_fmt_vid_out ||
ops->vidioc_g_fmt_vid_out_mplane ||
ops->vidioc_g_fmt_vid_out_overlay)))
set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_s_fmt_vid_cap ||
ops->vidioc_s_fmt_vid_cap_mplane ||
ops->vidioc_s_fmt_vid_overlay)) ||
(is_tx && (ops->vidioc_s_fmt_vid_out ||
ops->vidioc_s_fmt_vid_out_mplane ||
ops->vidioc_s_fmt_vid_out_overlay)))
set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_try_fmt_vid_cap ||
ops->vidioc_try_fmt_vid_cap_mplane ||
ops->vidioc_try_fmt_vid_overlay)) ||
(is_tx && (ops->vidioc_try_fmt_vid_out ||
ops->vidioc_try_fmt_vid_out_mplane ||
ops->vidioc_try_fmt_vid_out_overlay)))
set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
} else if (is_vbi) {
if ((is_rx && (ops->vidioc_g_fmt_vbi_cap ||
ops->vidioc_g_fmt_sliced_vbi_cap)) ||
(is_tx && (ops->vidioc_g_fmt_vbi_out ||
ops->vidioc_g_fmt_sliced_vbi_out)))
set_bit(_IOC_NR(VIDIOC_G_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_s_fmt_vbi_cap ||
ops->vidioc_s_fmt_sliced_vbi_cap)) ||
(is_tx && (ops->vidioc_s_fmt_vbi_out ||
ops->vidioc_s_fmt_sliced_vbi_out)))
set_bit(_IOC_NR(VIDIOC_S_FMT), valid_ioctls);
if ((is_rx && (ops->vidioc_try_fmt_vbi_cap ||
ops->vidioc_try_fmt_sliced_vbi_cap)) ||
(is_tx && (ops->vidioc_try_fmt_vbi_out ||
ops->vidioc_try_fmt_sliced_vbi_out)))
set_bit(_IOC_NR(VIDIOC_TRY_FMT), valid_ioctls);
}
SET_VALID_IOCTL(ops, VIDIOC_REQBUFS, vidioc_reqbufs);
SET_VALID_IOCTL(ops, VIDIOC_QUERYBUF, vidioc_querybuf);
SET_VALID_IOCTL(ops, VIDIOC_QBUF, vidioc_qbuf);
SET_VALID_IOCTL(ops, VIDIOC_DQBUF, vidioc_dqbuf);
SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay);
SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf);
SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf);
if (is_vid) {
SET_VALID_IOCTL(ops, VIDIOC_OVERLAY, vidioc_overlay);
SET_VALID_IOCTL(ops, VIDIOC_G_FBUF, vidioc_g_fbuf);
SET_VALID_IOCTL(ops, VIDIOC_S_FBUF, vidioc_s_fbuf);
}
SET_VALID_IOCTL(ops, VIDIOC_STREAMON, vidioc_streamon);
SET_VALID_IOCTL(ops, VIDIOC_STREAMOFF, vidioc_streamoff);
if (ops->vidioc_s_std)
set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
if (ops->vidioc_g_std || vdev->current_norm)
set_bit(_IOC_NR(VIDIOC_G_STD), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
if (!is_radio) {
if (ops->vidioc_s_std)
set_bit(_IOC_NR(VIDIOC_ENUMSTD), valid_ioctls);
if (ops->vidioc_g_std || vdev->current_norm)
set_bit(_IOC_NR(VIDIOC_G_STD), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_S_STD, vidioc_s_std);
if (is_rx)
SET_VALID_IOCTL(ops, VIDIOC_QUERYSTD, vidioc_querystd);
if (is_rx) {
SET_VALID_IOCTL(ops, VIDIOC_ENUMINPUT, vidioc_enum_input);
SET_VALID_IOCTL(ops, VIDIOC_G_INPUT, vidioc_g_input);
SET_VALID_IOCTL(ops, VIDIOC_S_INPUT, vidioc_s_input);
SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
}
if (is_tx) {
SET_VALID_IOCTL(ops, VIDIOC_ENUMOUTPUT, vidioc_enum_output);
SET_VALID_IOCTL(ops, VIDIOC_G_OUTPUT, vidioc_g_output);
SET_VALID_IOCTL(ops, VIDIOC_S_OUTPUT, vidioc_s_output);
SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
}
}
/* Note: the control handler can also be passed through the filehandle,
and that can't be tested here. If the bit for these control ioctls
is set, then the ioctl is valid. But if it is 0, then it can still
Expand All @@ -639,56 +665,68 @@ static void determine_valid_ioctls(struct video_device *vdev)
set_bit(_IOC_NR(VIDIOC_TRY_EXT_CTRLS), valid_ioctls);
if (vdev->ctrl_handler || ops->vidioc_querymenu)
set_bit(_IOC_NR(VIDIOC_QUERYMENU), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDIO, vidioc_enumaudio);
SET_VALID_IOCTL(ops, VIDIOC_G_AUDIO, vidioc_g_audio);
SET_VALID_IOCTL(ops, VIDIOC_S_AUDIO, vidioc_s_audio);
SET_VALID_IOCTL(ops, VIDIOC_ENUMAUDOUT, vidioc_enumaudout);
SET_VALID_IOCTL(ops, VIDIOC_G_AUDOUT, vidioc_g_audout);
SET_VALID_IOCTL(ops, VIDIOC_S_AUDOUT, vidioc_s_audout);
SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator);
SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator);
if (ops->vidioc_g_crop || ops->vidioc_g_selection)
set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
if (ops->vidioc_s_crop || ops->vidioc_s_selection)
set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
if (ops->vidioc_cropcap || ops->vidioc_g_selection)
set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp);
SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index);
SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd);
SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd);
SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd);
SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER &&
if (is_tx) {
SET_VALID_IOCTL(ops, VIDIOC_G_MODULATOR, vidioc_g_modulator);
SET_VALID_IOCTL(ops, VIDIOC_S_MODULATOR, vidioc_s_modulator);
}
if (!is_radio) {
if (ops->vidioc_g_crop || ops->vidioc_g_selection)
set_bit(_IOC_NR(VIDIOC_G_CROP), valid_ioctls);
if (ops->vidioc_s_crop || ops->vidioc_s_selection)
set_bit(_IOC_NR(VIDIOC_S_CROP), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_G_SELECTION, vidioc_g_selection);
SET_VALID_IOCTL(ops, VIDIOC_S_SELECTION, vidioc_s_selection);
if (ops->vidioc_cropcap || ops->vidioc_g_selection)
set_bit(_IOC_NR(VIDIOC_CROPCAP), valid_ioctls);
}
if (is_vid) {
SET_VALID_IOCTL(ops, VIDIOC_G_JPEGCOMP, vidioc_g_jpegcomp);
SET_VALID_IOCTL(ops, VIDIOC_S_JPEGCOMP, vidioc_s_jpegcomp);
SET_VALID_IOCTL(ops, VIDIOC_G_ENC_INDEX, vidioc_g_enc_index);
SET_VALID_IOCTL(ops, VIDIOC_ENCODER_CMD, vidioc_encoder_cmd);
SET_VALID_IOCTL(ops, VIDIOC_TRY_ENCODER_CMD, vidioc_try_encoder_cmd);
SET_VALID_IOCTL(ops, VIDIOC_DECODER_CMD, vidioc_decoder_cmd);
SET_VALID_IOCTL(ops, VIDIOC_TRY_DECODER_CMD, vidioc_try_decoder_cmd);
}
if (!is_radio) {
if (ops->vidioc_g_parm || (vdev->vfl_type == VFL_TYPE_GRABBER &&
(ops->vidioc_g_std || vdev->current_norm)))
set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner);
SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner);
set_bit(_IOC_NR(VIDIOC_G_PARM), valid_ioctls);
SET_VALID_IOCTL(ops, VIDIOC_S_PARM, vidioc_s_parm);
}
if (is_rx) {
SET_VALID_IOCTL(ops, VIDIOC_G_TUNER, vidioc_g_tuner);
SET_VALID_IOCTL(ops, VIDIOC_S_TUNER, vidioc_s_tuner);
}
SET_VALID_IOCTL(ops, VIDIOC_G_FREQUENCY, vidioc_g_frequency);
SET_VALID_IOCTL(ops, VIDIOC_S_FREQUENCY, vidioc_s_frequency);
SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
if (is_vbi)
SET_VALID_IOCTL(ops, VIDIOC_G_SLICED_VBI_CAP, vidioc_g_sliced_vbi_cap);
SET_VALID_IOCTL(ops, VIDIOC_LOG_STATUS, vidioc_log_status);
#ifdef CONFIG_VIDEO_ADV_DEBUG
SET_VALID_IOCTL(ops, VIDIOC_DBG_G_REGISTER, vidioc_g_register);
SET_VALID_IOCTL(ops, VIDIOC_DBG_S_REGISTER, vidioc_s_register);
#endif
SET_VALID_IOCTL(ops, VIDIOC_DBG_G_CHIP_IDENT, vidioc_g_chip_ident);
SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek);
SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_PRESETS, vidioc_enum_dv_presets);
SET_VALID_IOCTL(ops, VIDIOC_S_DV_PRESET, vidioc_s_dv_preset);
SET_VALID_IOCTL(ops, VIDIOC_G_DV_PRESET, vidioc_g_dv_preset);
SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_PRESET, vidioc_query_dv_preset);
SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap);
if (is_rx)
SET_VALID_IOCTL(ops, VIDIOC_S_HW_FREQ_SEEK, vidioc_s_hw_freq_seek);
if (is_vid) {
SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMESIZES, vidioc_enum_framesizes);
SET_VALID_IOCTL(ops, VIDIOC_ENUM_FRAMEINTERVALS, vidioc_enum_frameintervals);
}
if (!is_radio) {
SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_PRESETS, vidioc_enum_dv_presets);
SET_VALID_IOCTL(ops, VIDIOC_S_DV_PRESET, vidioc_s_dv_preset);
SET_VALID_IOCTL(ops, VIDIOC_G_DV_PRESET, vidioc_g_dv_preset);
if (is_rx)
SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_PRESET, vidioc_query_dv_preset);
SET_VALID_IOCTL(ops, VIDIOC_S_DV_TIMINGS, vidioc_s_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_G_DV_TIMINGS, vidioc_g_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_ENUM_DV_TIMINGS, vidioc_enum_dv_timings);
if (is_rx)
SET_VALID_IOCTL(ops, VIDIOC_QUERY_DV_TIMINGS, vidioc_query_dv_timings);
SET_VALID_IOCTL(ops, VIDIOC_DV_TIMINGS_CAP, vidioc_dv_timings_cap);
}
/* yes, really vidioc_subscribe_event */
SET_VALID_IOCTL(ops, VIDIOC_DQEVENT, vidioc_subscribe_event);
SET_VALID_IOCTL(ops, VIDIOC_SUBSCRIBE_EVENT, vidioc_subscribe_event);
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