b769f49463
Was: [PATCH] sound/oss/midi_synth: prevent underflow, use of uninitialized value, and signedness issue The offset passed to midi_synth_load_patch() can be essentially arbitrary. If it's greater than the header length, this will result in a copy_from_user(dst, src, negative_val). While this will just return -EFAULT on x86, on other architectures this may cause memory corruption. Additionally, the length field of the sysex_info structure may not be initialized prior to its use. Finally, a signed comparison may result in an unintentionally large loop. On suggestion by Takashi Iwai, version two removes the offset argument from the load_patch callbacks entirely, which also resolves similar issues in opl3. Compile tested only. v3 adjusts comments and hopefully gets copy offsets right. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
712 lines
15 KiB
C
712 lines
15 KiB
C
/*
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* sound/oss/midi_synth.c
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*
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* High level midi sequencer manager for dumb MIDI interfaces.
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*/
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/*
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* Copyright (C) by Hannu Savolainen 1993-1997
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*
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* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
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* Version 2 (June 1991). See the "COPYING" file distributed with this software
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* for more info.
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*/
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/*
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* Thomas Sailer : ioctl code reworked (vmalloc/vfree removed)
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* Andrew Veliath : fixed running status in MIDI input state machine
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*/
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#define USE_SEQ_MACROS
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#define USE_SIMPLE_MACROS
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#include "sound_config.h"
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#define _MIDI_SYNTH_C_
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#include "midi_synth.h"
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static int midi2synth[MAX_MIDI_DEV];
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static int sysex_state[MAX_MIDI_DEV] =
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{0};
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static unsigned char prev_out_status[MAX_MIDI_DEV];
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#define STORE(cmd) \
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{ \
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int len; \
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unsigned char obuf[8]; \
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cmd; \
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seq_input_event(obuf, len); \
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}
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#define _seqbuf obuf
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#define _seqbufptr 0
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#define _SEQ_ADVBUF(x) len=x
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void
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do_midi_msg(int synthno, unsigned char *msg, int mlen)
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{
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switch (msg[0] & 0xf0)
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{
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case 0x90:
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if (msg[2] != 0)
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{
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STORE(SEQ_START_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
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break;
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}
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msg[2] = 64;
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case 0x80:
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STORE(SEQ_STOP_NOTE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
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break;
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case 0xA0:
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STORE(SEQ_KEY_PRESSURE(synthno, msg[0] & 0x0f, msg[1], msg[2]));
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break;
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case 0xB0:
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STORE(SEQ_CONTROL(synthno, msg[0] & 0x0f,
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msg[1], msg[2]));
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break;
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case 0xC0:
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STORE(SEQ_SET_PATCH(synthno, msg[0] & 0x0f, msg[1]));
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break;
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case 0xD0:
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STORE(SEQ_CHN_PRESSURE(synthno, msg[0] & 0x0f, msg[1]));
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break;
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case 0xE0:
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STORE(SEQ_BENDER(synthno, msg[0] & 0x0f,
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(msg[1] & 0x7f) | ((msg[2] & 0x7f) << 7)));
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break;
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default:
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/* printk( "MPU: Unknown midi channel message %02x\n", msg[0]); */
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;
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}
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}
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EXPORT_SYMBOL(do_midi_msg);
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static void
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midi_outc(int midi_dev, int data)
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{
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int timeout;
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for (timeout = 0; timeout < 3200; timeout++)
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if (midi_devs[midi_dev]->outputc(midi_dev, (unsigned char) (data & 0xff)))
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{
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if (data & 0x80) /*
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* Status byte
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*/
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prev_out_status[midi_dev] =
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(unsigned char) (data & 0xff); /*
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* Store for running status
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*/
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return; /*
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* Mission complete
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*/
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}
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/*
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* Sorry! No space on buffers.
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*/
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printk("Midi send timed out\n");
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}
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static int
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prefix_cmd(int midi_dev, unsigned char status)
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{
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if ((char *) midi_devs[midi_dev]->prefix_cmd == NULL)
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return 1;
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return midi_devs[midi_dev]->prefix_cmd(midi_dev, status);
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}
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static void
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midi_synth_input(int orig_dev, unsigned char data)
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{
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int dev;
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struct midi_input_info *inc;
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static unsigned char len_tab[] = /* # of data bytes following a status
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*/
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{
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2, /* 8x */
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2, /* 9x */
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2, /* Ax */
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2, /* Bx */
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1, /* Cx */
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1, /* Dx */
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2, /* Ex */
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0 /* Fx */
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};
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if (orig_dev < 0 || orig_dev > num_midis || midi_devs[orig_dev] == NULL)
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return;
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if (data == 0xfe) /* Ignore active sensing */
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return;
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dev = midi2synth[orig_dev];
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inc = &midi_devs[orig_dev]->in_info;
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switch (inc->m_state)
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{
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case MST_INIT:
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if (data & 0x80) /* MIDI status byte */
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{
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if ((data & 0xf0) == 0xf0) /* Common message */
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{
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switch (data)
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{
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case 0xf0: /* Sysex */
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inc->m_state = MST_SYSEX;
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break; /* Sysex */
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case 0xf1: /* MTC quarter frame */
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case 0xf3: /* Song select */
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inc->m_state = MST_DATA;
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inc->m_ptr = 1;
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inc->m_left = 1;
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inc->m_buf[0] = data;
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break;
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case 0xf2: /* Song position pointer */
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inc->m_state = MST_DATA;
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inc->m_ptr = 1;
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inc->m_left = 2;
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inc->m_buf[0] = data;
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break;
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default:
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inc->m_buf[0] = data;
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inc->m_ptr = 1;
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do_midi_msg(dev, inc->m_buf, inc->m_ptr);
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inc->m_ptr = 0;
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inc->m_left = 0;
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}
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} else
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{
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inc->m_state = MST_DATA;
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inc->m_ptr = 1;
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inc->m_left = len_tab[(data >> 4) - 8];
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inc->m_buf[0] = inc->m_prev_status = data;
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}
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} else if (inc->m_prev_status & 0x80) {
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/* Data byte (use running status) */
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inc->m_ptr = 2;
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inc->m_buf[1] = data;
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inc->m_buf[0] = inc->m_prev_status;
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inc->m_left = len_tab[(inc->m_buf[0] >> 4) - 8] - 1;
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if (inc->m_left > 0)
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inc->m_state = MST_DATA; /* Not done yet */
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else {
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inc->m_state = MST_INIT;
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do_midi_msg(dev, inc->m_buf, inc->m_ptr);
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inc->m_ptr = 0;
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}
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}
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break; /* MST_INIT */
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case MST_DATA:
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inc->m_buf[inc->m_ptr++] = data;
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if (--inc->m_left <= 0)
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{
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inc->m_state = MST_INIT;
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do_midi_msg(dev, inc->m_buf, inc->m_ptr);
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inc->m_ptr = 0;
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}
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break; /* MST_DATA */
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case MST_SYSEX:
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if (data == 0xf7) /* Sysex end */
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{
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inc->m_state = MST_INIT;
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inc->m_left = 0;
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inc->m_ptr = 0;
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}
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break; /* MST_SYSEX */
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default:
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printk("MIDI%d: Unexpected state %d (%02x)\n", orig_dev, inc->m_state, (int) data);
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inc->m_state = MST_INIT;
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}
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}
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static void
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leave_sysex(int dev)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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int timeout = 0;
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if (!sysex_state[dev])
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return;
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sysex_state[dev] = 0;
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while (!midi_devs[orig_dev]->outputc(orig_dev, 0xf7) &&
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timeout < 1000)
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timeout++;
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sysex_state[dev] = 0;
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}
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static void
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midi_synth_output(int dev)
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{
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/*
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* Currently NOP
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*/
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}
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int midi_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
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{
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/*
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* int orig_dev = synth_devs[dev]->midi_dev;
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*/
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switch (cmd) {
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case SNDCTL_SYNTH_INFO:
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if (__copy_to_user(arg, synth_devs[dev]->info, sizeof(struct synth_info)))
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return -EFAULT;
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return 0;
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case SNDCTL_SYNTH_MEMAVL:
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return 0x7fffffff;
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default:
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL(midi_synth_ioctl);
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int
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midi_synth_kill_note(int dev, int channel, int note, int velocity)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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int msg, chn;
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if (note < 0 || note > 127)
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return 0;
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if (channel < 0 || channel > 15)
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return 0;
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if (velocity < 0)
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velocity = 0;
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if (velocity > 127)
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velocity = 127;
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leave_sysex(dev);
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msg = prev_out_status[orig_dev] & 0xf0;
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chn = prev_out_status[orig_dev] & 0x0f;
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if (chn == channel && ((msg == 0x90 && velocity == 64) || msg == 0x80))
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{ /*
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* Use running status
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*/
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if (!prefix_cmd(orig_dev, note))
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return 0;
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midi_outc(orig_dev, note);
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if (msg == 0x90) /*
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* Running status = Note on
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*/
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midi_outc(orig_dev, 0); /*
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* Note on with velocity 0 == note
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* off
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*/
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else
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midi_outc(orig_dev, velocity);
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} else
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{
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if (velocity == 64)
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{
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if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
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return 0;
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midi_outc(orig_dev, 0x90 | (channel & 0x0f)); /*
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* Note on
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*/
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midi_outc(orig_dev, note);
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midi_outc(orig_dev, 0); /*
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* Zero G
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*/
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} else
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{
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if (!prefix_cmd(orig_dev, 0x80 | (channel & 0x0f)))
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return 0;
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midi_outc(orig_dev, 0x80 | (channel & 0x0f)); /*
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* Note off
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*/
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midi_outc(orig_dev, note);
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midi_outc(orig_dev, velocity);
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}
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}
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return 0;
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}
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EXPORT_SYMBOL(midi_synth_kill_note);
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int
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midi_synth_set_instr(int dev, int channel, int instr_no)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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if (instr_no < 0 || instr_no > 127)
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instr_no = 0;
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if (channel < 0 || channel > 15)
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return 0;
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leave_sysex(dev);
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if (!prefix_cmd(orig_dev, 0xc0 | (channel & 0x0f)))
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return 0;
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midi_outc(orig_dev, 0xc0 | (channel & 0x0f)); /*
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* Program change
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*/
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midi_outc(orig_dev, instr_no);
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return 0;
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}
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EXPORT_SYMBOL(midi_synth_set_instr);
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int
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midi_synth_start_note(int dev, int channel, int note, int velocity)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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int msg, chn;
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if (note < 0 || note > 127)
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return 0;
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if (channel < 0 || channel > 15)
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return 0;
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if (velocity < 0)
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velocity = 0;
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if (velocity > 127)
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velocity = 127;
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leave_sysex(dev);
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msg = prev_out_status[orig_dev] & 0xf0;
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chn = prev_out_status[orig_dev] & 0x0f;
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if (chn == channel && msg == 0x90)
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{ /*
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* Use running status
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*/
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if (!prefix_cmd(orig_dev, note))
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return 0;
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midi_outc(orig_dev, note);
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midi_outc(orig_dev, velocity);
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} else
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{
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if (!prefix_cmd(orig_dev, 0x90 | (channel & 0x0f)))
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return 0;
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midi_outc(orig_dev, 0x90 | (channel & 0x0f)); /*
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* Note on
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*/
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midi_outc(orig_dev, note);
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midi_outc(orig_dev, velocity);
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}
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return 0;
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}
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EXPORT_SYMBOL(midi_synth_start_note);
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void
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midi_synth_reset(int dev)
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{
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leave_sysex(dev);
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}
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EXPORT_SYMBOL(midi_synth_reset);
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int
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midi_synth_open(int dev, int mode)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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int err;
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struct midi_input_info *inc;
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if (orig_dev < 0 || orig_dev >= num_midis || midi_devs[orig_dev] == NULL)
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return -ENXIO;
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midi2synth[orig_dev] = dev;
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sysex_state[dev] = 0;
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prev_out_status[orig_dev] = 0;
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if ((err = midi_devs[orig_dev]->open(orig_dev, mode,
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midi_synth_input, midi_synth_output)) < 0)
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return err;
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inc = &midi_devs[orig_dev]->in_info;
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/* save_flags(flags);
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cli();
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don't know against what irqhandler to protect*/
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inc->m_busy = 0;
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inc->m_state = MST_INIT;
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inc->m_ptr = 0;
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inc->m_left = 0;
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inc->m_prev_status = 0x00;
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/* restore_flags(flags); */
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return 1;
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}
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EXPORT_SYMBOL(midi_synth_open);
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void
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midi_synth_close(int dev)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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leave_sysex(dev);
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/*
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* Shut up the synths by sending just single active sensing message.
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*/
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midi_devs[orig_dev]->outputc(orig_dev, 0xfe);
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midi_devs[orig_dev]->close(orig_dev);
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}
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EXPORT_SYMBOL(midi_synth_close);
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void
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midi_synth_hw_control(int dev, unsigned char *event)
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{
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}
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EXPORT_SYMBOL(midi_synth_hw_control);
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int
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midi_synth_load_patch(int dev, int format, const char __user *addr,
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int count, int pmgr_flag)
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{
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int orig_dev = synth_devs[dev]->midi_dev;
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struct sysex_info sysex;
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int i;
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unsigned long left, src_offs, eox_seen = 0;
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int first_byte = 1;
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int hdr_size = (unsigned long) &sysex.data[0] - (unsigned long) &sysex;
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leave_sysex(dev);
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if (!prefix_cmd(orig_dev, 0xf0))
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return 0;
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/* Invalid patch format */
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if (format != SYSEX_PATCH)
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return -EINVAL;
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/* Patch header too short */
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if (count < hdr_size)
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return -EINVAL;
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count -= hdr_size;
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/*
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* Copy the header from user space
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*/
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if (copy_from_user(&sysex, addr, hdr_size))
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return -EFAULT;
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/* Sysex record too short */
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if ((unsigned)count < (unsigned)sysex.len)
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sysex.len = count;
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left = sysex.len;
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src_offs = 0;
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for (i = 0; i < left && !signal_pending(current); i++)
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{
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unsigned char data;
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if (get_user(data,
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(unsigned char __user *)(addr + hdr_size + i)))
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return -EFAULT;
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eox_seen = (i > 0 && data & 0x80); /* End of sysex */
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if (eox_seen && data != 0xf7)
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data = 0xf7;
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if (i == 0)
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{
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if (data != 0xf0)
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{
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printk(KERN_WARNING "midi_synth: Sysex start missing\n");
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return -EINVAL;
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}
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}
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while (!midi_devs[orig_dev]->outputc(orig_dev, (unsigned char) (data & 0xff)) &&
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!signal_pending(current))
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schedule();
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if (!first_byte && data & 0x80)
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return 0;
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first_byte = 0;
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}
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|
|
|
if (!eox_seen)
|
|
midi_outc(orig_dev, 0xf7);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_load_patch);
|
|
|
|
void midi_synth_panning(int dev, int channel, int pressure)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_panning);
|
|
|
|
void midi_synth_aftertouch(int dev, int channel, int pressure)
|
|
{
|
|
int orig_dev = synth_devs[dev]->midi_dev;
|
|
int msg, chn;
|
|
|
|
if (pressure < 0 || pressure > 127)
|
|
return;
|
|
if (channel < 0 || channel > 15)
|
|
return;
|
|
|
|
leave_sysex(dev);
|
|
|
|
msg = prev_out_status[orig_dev] & 0xf0;
|
|
chn = prev_out_status[orig_dev] & 0x0f;
|
|
|
|
if (msg != 0xd0 || chn != channel) /*
|
|
* Test for running status
|
|
*/
|
|
{
|
|
if (!prefix_cmd(orig_dev, 0xd0 | (channel & 0x0f)))
|
|
return;
|
|
midi_outc(orig_dev, 0xd0 | (channel & 0x0f)); /*
|
|
* Channel pressure
|
|
*/
|
|
} else if (!prefix_cmd(orig_dev, pressure))
|
|
return;
|
|
|
|
midi_outc(orig_dev, pressure);
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_aftertouch);
|
|
|
|
void
|
|
midi_synth_controller(int dev, int channel, int ctrl_num, int value)
|
|
{
|
|
int orig_dev = synth_devs[dev]->midi_dev;
|
|
int chn, msg;
|
|
|
|
if (ctrl_num < 0 || ctrl_num > 127)
|
|
return;
|
|
if (channel < 0 || channel > 15)
|
|
return;
|
|
|
|
leave_sysex(dev);
|
|
|
|
msg = prev_out_status[orig_dev] & 0xf0;
|
|
chn = prev_out_status[orig_dev] & 0x0f;
|
|
|
|
if (msg != 0xb0 || chn != channel)
|
|
{
|
|
if (!prefix_cmd(orig_dev, 0xb0 | (channel & 0x0f)))
|
|
return;
|
|
midi_outc(orig_dev, 0xb0 | (channel & 0x0f));
|
|
} else if (!prefix_cmd(orig_dev, ctrl_num))
|
|
return;
|
|
|
|
midi_outc(orig_dev, ctrl_num);
|
|
midi_outc(orig_dev, value & 0x7f);
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_controller);
|
|
|
|
void
|
|
midi_synth_bender(int dev, int channel, int value)
|
|
{
|
|
int orig_dev = synth_devs[dev]->midi_dev;
|
|
int msg, prev_chn;
|
|
|
|
if (channel < 0 || channel > 15)
|
|
return;
|
|
|
|
if (value < 0 || value > 16383)
|
|
return;
|
|
|
|
leave_sysex(dev);
|
|
|
|
msg = prev_out_status[orig_dev] & 0xf0;
|
|
prev_chn = prev_out_status[orig_dev] & 0x0f;
|
|
|
|
if (msg != 0xd0 || prev_chn != channel) /*
|
|
* Test for running status
|
|
*/
|
|
{
|
|
if (!prefix_cmd(orig_dev, 0xe0 | (channel & 0x0f)))
|
|
return;
|
|
midi_outc(orig_dev, 0xe0 | (channel & 0x0f));
|
|
} else if (!prefix_cmd(orig_dev, value & 0x7f))
|
|
return;
|
|
|
|
midi_outc(orig_dev, value & 0x7f);
|
|
midi_outc(orig_dev, (value >> 7) & 0x7f);
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_bender);
|
|
|
|
void
|
|
midi_synth_setup_voice(int dev, int voice, int channel)
|
|
{
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_setup_voice);
|
|
|
|
int
|
|
midi_synth_send_sysex(int dev, unsigned char *bytes, int len)
|
|
{
|
|
int orig_dev = synth_devs[dev]->midi_dev;
|
|
int i;
|
|
|
|
for (i = 0; i < len; i++)
|
|
{
|
|
switch (bytes[i])
|
|
{
|
|
case 0xf0: /* Start sysex */
|
|
if (!prefix_cmd(orig_dev, 0xf0))
|
|
return 0;
|
|
sysex_state[dev] = 1;
|
|
break;
|
|
|
|
case 0xf7: /* End sysex */
|
|
if (!sysex_state[dev]) /* Orphan sysex end */
|
|
return 0;
|
|
sysex_state[dev] = 0;
|
|
break;
|
|
|
|
default:
|
|
if (!sysex_state[dev])
|
|
return 0;
|
|
|
|
if (bytes[i] & 0x80) /* Error. Another message before sysex end */
|
|
{
|
|
bytes[i] = 0xf7; /* Sysex end */
|
|
sysex_state[dev] = 0;
|
|
}
|
|
}
|
|
|
|
if (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]))
|
|
{
|
|
/*
|
|
* Hardware level buffer is full. Abort the sysex message.
|
|
*/
|
|
|
|
int timeout = 0;
|
|
|
|
bytes[i] = 0xf7;
|
|
sysex_state[dev] = 0;
|
|
|
|
while (!midi_devs[orig_dev]->outputc(orig_dev, bytes[i]) &&
|
|
timeout < 1000)
|
|
timeout++;
|
|
}
|
|
if (!sysex_state[dev])
|
|
return 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(midi_synth_send_sysex);
|
|
|