350 lines
9.9 KiB
C
350 lines
9.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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//
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// Validation of USB-audio class descriptors
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//
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#include <linux/init.h>
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#include <linux/usb.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/audio-v2.h>
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#include <linux/usb/audio-v3.h>
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#include <linux/usb/midi.h>
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#include "usbaudio.h"
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#include "helper.h"
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struct usb_desc_validator {
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unsigned char protocol;
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unsigned char type;
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bool (*func)(const void *p, const struct usb_desc_validator *v);
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size_t size;
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};
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#define UAC_VERSION_ALL (unsigned char)(-1)
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/* UAC1 only */
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static bool validate_uac1_header(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac1_ac_header_descriptor *d = p;
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return d->bLength >= sizeof(*d) &&
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d->bLength >= sizeof(*d) + d->bInCollection;
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}
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/* for mixer unit; covering all UACs */
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static bool validate_mixer_unit(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac_mixer_unit_descriptor *d = p;
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size_t len;
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if (d->bLength < sizeof(*d) || !d->bNrInPins)
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return false;
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len = sizeof(*d) + d->bNrInPins;
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/* We can't determine the bitmap size only from this unit descriptor,
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* so just check with the remaining length.
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* The actual bitmap is checked at mixer unit parser.
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*/
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switch (v->protocol) {
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case UAC_VERSION_1:
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default:
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len += 2 + 1; /* wChannelConfig, iChannelNames */
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/* bmControls[n*m] */
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len += 1; /* iMixer */
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break;
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case UAC_VERSION_2:
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len += 4 + 1; /* bmChannelConfig, iChannelNames */
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/* bmMixerControls[n*m] */
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len += 1 + 1; /* bmControls, iMixer */
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break;
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case UAC_VERSION_3:
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len += 2; /* wClusterDescrID */
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/* bmMixerControls[n*m] */
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break;
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}
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return d->bLength >= len;
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}
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/* both for processing and extension units; covering all UACs */
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static bool validate_processing_unit(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac_processing_unit_descriptor *d = p;
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const unsigned char *hdr = p;
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size_t len, m;
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if (d->bLength < sizeof(*d))
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return false;
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len = sizeof(*d) + d->bNrInPins;
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if (d->bLength < len)
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return false;
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switch (v->protocol) {
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case UAC_VERSION_1:
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default:
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/* bNrChannels, wChannelConfig, iChannelNames */
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len += 1 + 2 + 1;
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if (d->bLength < len + 1) /* bControlSize */
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return false;
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m = hdr[len];
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len += 1 + m + 1; /* bControlSize, bmControls, iProcessing */
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break;
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case UAC_VERSION_2:
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/* bNrChannels, bmChannelConfig, iChannelNames */
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len += 1 + 4 + 1;
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if (v->type == UAC2_PROCESSING_UNIT_V2)
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len += 2; /* bmControls -- 2 bytes for PU */
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else
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len += 1; /* bmControls -- 1 byte for EU */
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len += 1; /* iProcessing */
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break;
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case UAC_VERSION_3:
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/* wProcessingDescrStr, bmControls */
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len += 2 + 4;
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break;
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}
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if (d->bLength < len)
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return false;
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switch (v->protocol) {
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case UAC_VERSION_1:
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default:
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if (v->type == UAC1_EXTENSION_UNIT)
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return true; /* OK */
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switch (d->wProcessType) {
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case UAC_PROCESS_UP_DOWNMIX:
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case UAC_PROCESS_DOLBY_PROLOGIC:
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if (d->bLength < len + 1) /* bNrModes */
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return false;
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m = hdr[len];
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len += 1 + m * 2; /* bNrModes, waModes(n) */
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break;
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default:
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break;
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}
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break;
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case UAC_VERSION_2:
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if (v->type == UAC2_EXTENSION_UNIT_V2)
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return true; /* OK */
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switch (d->wProcessType) {
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case UAC2_PROCESS_UP_DOWNMIX:
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case UAC2_PROCESS_DOLBY_PROLOCIC: /* SiC! */
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if (d->bLength < len + 1) /* bNrModes */
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return false;
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m = hdr[len];
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len += 1 + m * 4; /* bNrModes, daModes(n) */
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break;
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default:
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break;
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}
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break;
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case UAC_VERSION_3:
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if (v->type == UAC3_EXTENSION_UNIT) {
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len += 2; /* wClusterDescrID */
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break;
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}
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switch (d->wProcessType) {
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case UAC3_PROCESS_UP_DOWNMIX:
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if (d->bLength < len + 1) /* bNrModes */
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return false;
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m = hdr[len];
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len += 1 + m * 2; /* bNrModes, waClusterDescrID(n) */
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break;
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case UAC3_PROCESS_MULTI_FUNCTION:
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len += 2 + 4; /* wClusterDescrID, bmAlgorighms */
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break;
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default:
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break;
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}
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break;
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}
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if (d->bLength < len)
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return false;
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return true;
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}
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/* both for selector and clock selector units; covering all UACs */
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static bool validate_selector_unit(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac_selector_unit_descriptor *d = p;
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size_t len;
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if (d->bLength < sizeof(*d))
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return false;
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len = sizeof(*d) + d->bNrInPins;
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switch (v->protocol) {
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case UAC_VERSION_1:
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default:
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len += 1; /* iSelector */
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break;
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case UAC_VERSION_2:
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len += 1 + 1; /* bmControls, iSelector */
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break;
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case UAC_VERSION_3:
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len += 4 + 2; /* bmControls, wSelectorDescrStr */
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break;
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}
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return d->bLength >= len;
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}
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static bool validate_uac1_feature_unit(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac_feature_unit_descriptor *d = p;
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if (d->bLength < sizeof(*d) || !d->bControlSize)
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return false;
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/* at least bmaControls(0) for master channel + iFeature */
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return d->bLength >= sizeof(*d) + d->bControlSize + 1;
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}
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static bool validate_uac2_feature_unit(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac2_feature_unit_descriptor *d = p;
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if (d->bLength < sizeof(*d))
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return false;
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/* at least bmaControls(0) for master channel + iFeature */
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return d->bLength >= sizeof(*d) + 4 + 1;
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}
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static bool validate_uac3_feature_unit(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct uac3_feature_unit_descriptor *d = p;
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if (d->bLength < sizeof(*d))
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return false;
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/* at least bmaControls(0) for master channel + wFeatureDescrStr */
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return d->bLength >= sizeof(*d) + 4 + 2;
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}
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static bool validate_midi_out_jack(const void *p,
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const struct usb_desc_validator *v)
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{
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const struct usb_midi_out_jack_descriptor *d = p;
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return d->bLength >= sizeof(*d) &&
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d->bLength >= sizeof(*d) + d->bNrInputPins * 2;
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}
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#define FIXED(p, t, s) { .protocol = (p), .type = (t), .size = sizeof(s) }
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#define FUNC(p, t, f) { .protocol = (p), .type = (t), .func = (f) }
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static struct usb_desc_validator audio_validators[] = {
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/* UAC1 */
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FUNC(UAC_VERSION_1, UAC_HEADER, validate_uac1_header),
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FIXED(UAC_VERSION_1, UAC_INPUT_TERMINAL,
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struct uac_input_terminal_descriptor),
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FIXED(UAC_VERSION_1, UAC_OUTPUT_TERMINAL,
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struct uac1_output_terminal_descriptor),
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FUNC(UAC_VERSION_1, UAC_MIXER_UNIT, validate_mixer_unit),
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FUNC(UAC_VERSION_1, UAC_SELECTOR_UNIT, validate_selector_unit),
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FUNC(UAC_VERSION_1, UAC_FEATURE_UNIT, validate_uac1_feature_unit),
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FUNC(UAC_VERSION_1, UAC1_PROCESSING_UNIT, validate_processing_unit),
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FUNC(UAC_VERSION_1, UAC1_EXTENSION_UNIT, validate_processing_unit),
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/* UAC2 */
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FIXED(UAC_VERSION_2, UAC_HEADER, struct uac2_ac_header_descriptor),
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FIXED(UAC_VERSION_2, UAC_INPUT_TERMINAL,
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struct uac2_input_terminal_descriptor),
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FIXED(UAC_VERSION_2, UAC_OUTPUT_TERMINAL,
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struct uac2_output_terminal_descriptor),
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FUNC(UAC_VERSION_2, UAC_MIXER_UNIT, validate_mixer_unit),
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FUNC(UAC_VERSION_2, UAC_SELECTOR_UNIT, validate_selector_unit),
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FUNC(UAC_VERSION_2, UAC_FEATURE_UNIT, validate_uac2_feature_unit),
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/* UAC_VERSION_2, UAC2_EFFECT_UNIT: not implemented yet */
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FUNC(UAC_VERSION_2, UAC2_PROCESSING_UNIT_V2, validate_processing_unit),
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FUNC(UAC_VERSION_2, UAC2_EXTENSION_UNIT_V2, validate_processing_unit),
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FIXED(UAC_VERSION_2, UAC2_CLOCK_SOURCE,
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struct uac_clock_source_descriptor),
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FUNC(UAC_VERSION_2, UAC2_CLOCK_SELECTOR, validate_selector_unit),
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FIXED(UAC_VERSION_2, UAC2_CLOCK_MULTIPLIER,
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struct uac_clock_multiplier_descriptor),
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/* UAC_VERSION_2, UAC2_SAMPLE_RATE_CONVERTER: not implemented yet */
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/* UAC3 */
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FIXED(UAC_VERSION_2, UAC_HEADER, struct uac3_ac_header_descriptor),
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FIXED(UAC_VERSION_3, UAC_INPUT_TERMINAL,
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struct uac3_input_terminal_descriptor),
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FIXED(UAC_VERSION_3, UAC_OUTPUT_TERMINAL,
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struct uac3_output_terminal_descriptor),
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/* UAC_VERSION_3, UAC3_EXTENDED_TERMINAL: not implemented yet */
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FUNC(UAC_VERSION_3, UAC3_MIXER_UNIT, validate_mixer_unit),
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FUNC(UAC_VERSION_3, UAC3_SELECTOR_UNIT, validate_selector_unit),
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FUNC(UAC_VERSION_3, UAC_FEATURE_UNIT, validate_uac3_feature_unit),
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/* UAC_VERSION_3, UAC3_EFFECT_UNIT: not implemented yet */
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FUNC(UAC_VERSION_3, UAC3_PROCESSING_UNIT, validate_processing_unit),
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FUNC(UAC_VERSION_3, UAC3_EXTENSION_UNIT, validate_processing_unit),
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FIXED(UAC_VERSION_3, UAC3_CLOCK_SOURCE,
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struct uac3_clock_source_descriptor),
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FUNC(UAC_VERSION_3, UAC3_CLOCK_SELECTOR, validate_selector_unit),
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FIXED(UAC_VERSION_3, UAC3_CLOCK_MULTIPLIER,
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struct uac3_clock_multiplier_descriptor),
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/* UAC_VERSION_3, UAC3_SAMPLE_RATE_CONVERTER: not implemented yet */
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/* UAC_VERSION_3, UAC3_CONNECTORS: not implemented yet */
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{ } /* terminator */
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};
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static struct usb_desc_validator midi_validators[] = {
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FIXED(UAC_VERSION_ALL, USB_MS_HEADER,
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struct usb_ms_header_descriptor),
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FIXED(UAC_VERSION_ALL, USB_MS_MIDI_IN_JACK,
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struct usb_midi_in_jack_descriptor),
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FUNC(UAC_VERSION_ALL, USB_MS_MIDI_OUT_JACK,
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validate_midi_out_jack),
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{ } /* terminator */
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};
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/* Validate the given unit descriptor, return true if it's OK */
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static bool validate_desc(unsigned char *hdr, int protocol,
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const struct usb_desc_validator *v)
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{
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if (hdr[1] != USB_DT_CS_INTERFACE)
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return true; /* don't care */
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for (; v->type; v++) {
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if (v->type == hdr[2] &&
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(v->protocol == UAC_VERSION_ALL ||
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v->protocol == protocol)) {
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if (v->func)
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return v->func(hdr, v);
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/* check for the fixed size */
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return hdr[0] >= v->size;
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}
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}
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return true; /* not matching, skip validation */
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}
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bool snd_usb_validate_audio_desc(void *p, int protocol)
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{
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unsigned char *c = p;
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bool valid;
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valid = validate_desc(p, protocol, audio_validators);
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if (!valid && snd_usb_skip_validation) {
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print_hex_dump(KERN_ERR, "USB-audio: buggy audio desc: ",
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DUMP_PREFIX_NONE, 16, 1, c, c[0], true);
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valid = true;
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}
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return valid;
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}
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bool snd_usb_validate_midi_desc(void *p)
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{
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unsigned char *c = p;
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bool valid;
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valid = validate_desc(p, UAC_VERSION_1, midi_validators);
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if (!valid && snd_usb_skip_validation) {
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print_hex_dump(KERN_ERR, "USB-audio: buggy midi desc: ",
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DUMP_PREFIX_NONE, 16, 1, c, c[0], true);
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valid = true;
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}
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return valid;
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}
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