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SubjectRe: [CHECKER] 30 potential dereference of user-pointer errors
On Fri, 25 Apr 2003, Junfeng Yang wrote:

BTW, these reports are from 2.5.63.


> ---------------------------------------------------------
> Hi,
>
> I've submitted 8 such bugs several weeks before and thanks to Chris and
> other guys to fix most of them. Here are another 30 similar bugs. I got a
> warning in net/ipv4, which must be that I'm missing something, so please
> clarify. Also it seems I'm missing some assumptions for those video
> drivers.
>
> As usual, any responses will be appreciated. Thanks!
>
> Where bugs occur:
>
> net/ipv4/ip_sockglue.c
> drivers/i2c/i2c-dev.c
> drivers/ieee1394/video1394.c
> drivers/isdn/eicon/linchr.c
> drivers/media/dvb/av7110/av7110_ir.c
> drivers/media/radio/radio-cadet.c
> drivers/media/video/bw-qcam.c
> drivers/media/video/cpia.c
> drivers/media/video/zoran_procfs.c
> drivers/media/video/zr36120.c
> drivers/pnp/pnpbios/proc.c
> drivers/scsi/aacraid/commctrl.c
> drivers/usb/image/mdc800.c
> drivers/usb/media/vicam.c
> drivers/usb/serial/empeg.c
> drivers/usb/serial/io_edgeport.c
> drivers/usb/serial/ipaq.c
> drivers/usb/serial/keyspan.c
> drivers/video/sis/sis_main.c
> sound/oss/awe_wave.c
> sound/oss/cmpci.c
> sound/oss/mpu401.c
> sound/pci/es1938.c
>
>
> [UNKNOWN] maybe? it is in ipv4 though. ip_cmsg_send -> ip_options_get
> implies CMSG_DATA(cmsg) is tainted. It could be that the taintedness of CMSG_DATA(cmsg) depends on the case branch
>
> /home/junfeng/linux-tainted/net/ipv4/ip_sockglue.c:168:ip_cmsg_send: ERROR:TAINTED:168:168: dereferencing tainted ptr 'info' [Callstack: /home/junfeng/linux-tainted/net/ipv4/ip_options.c:518:ip_cmsg_send()]
>
> {
> struct in_pktinfo *info;
> if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
> return -EINVAL;
> info = (struct in_pktinfo *)CMSG_DATA(cmsg);
>
> Error --->
> ipc->oif = info->ipi_ifindex;
> ipc->addr = info->ipi_spec_dst.s_addr;
> break;
> }
> ---------------------------------------------------------
> [BUG] buf is tainted. can print out arbitrary kernel data
> /home/junfeng/linux-tainted/drivers/usb/serial/empeg.c:225:empeg_write: ERROR:TAINTED:225:225: passing tainted ptr 'buf' to usb_serial_debug_data [Callstack: /home/junfeng/linux-tainted/drivers/usb/serial/safe_serial.c:327:empeg_write((tainted 2))]
>
> int bytes_sent = 0;
> int transfer_size;
>
> dbg("%s - port %d", __FUNCTION__, port->number);
>
>
> Error --->
> usb_serial_debug_data (__FILE__, __FUNCTION__, count, buf);
>
> while (count > 0) {
>
> ---------------------------------------------------------
> [BUG] can print out arbitrary kernel data
> /home/junfeng/linux-tainted/drivers/usb/serial/ipaq.c:371:ipaq_write: ERROR:TAINTED:371:371: passing tainted ptr 'buf' to usb_serial_debug_data [Callstack: /home/junfeng/linux-tainted/drivers/usb/serial/safe_serial.c:327:ipaq_write((tainted 2))]
>
> int bytes_sent = 0;
> int transfer_size;
>
> dbg("%s - port %d", __FUNCTION__, port->number);
>
>
> Error --->
> usb_serial_debug_data(__FILE__, __FUNCTION__, count, buf);
>
> while (count > 0) {
> transfer_size = min(count, PACKET_SIZE);
> ---------------------------------------------------------
> [BUG] can print out arbitrary kernel data
> /home/junfeng/linux-tainted/drivers/usb/serial/keyspan.c:328:keyspan_write: ERROR:TAINTED:328:328: dereferencing tainted ptr 'buf' [Callstack: ]
>
>
> p_priv = usb_get_serial_port_data(port);
> d_details = p_priv->device_details;
>
> dbg("%s - for port %d (%d chars [%x]), flip=%d",
>
> Error --->
> __FUNCTION__, port->number, count, buf[0], p_priv->out_flip);
>
> for (left = count; left > 0; left -= todo) {
> todo = left;
> ---------------------------------------------------------
> [BUG] pointer (rdwr_arg.msgs[i]) points to user space
> /home/junfeng/linux-tainted/drivers/i2c/i2c-dev.c:230:i2cdev_ioctl: ERROR:TAINTED:230:230: dereferencing tainted ptr 'rdwr_arg.msgs + i * 12' [Callstack: ]
>
> if(rdwr_pa[i].buf == NULL)
> {
> res = -ENOMEM;
> break;
> }
>
> Error --->
> if(copy_from_user(rdwr_pa[i].buf,
> rdwr_arg.msgs[i].buf,
> rdwr_pa[i].len))
> {
> ---------------------------------------------------------
> [BUG] file_operations.read. even the parm itself has a name pUserBuffer
> /home/junfeng/linux-tainted/drivers/isdn/eicon/linchr.c:166:do_read: ERROR:TAINTED:166:166: passing tainted ptr 'pClientLogBuffer' to __constant_memcpy [Callstack: /home/junfeng/linux-tainted/drivers/scsi/sg.c:362:do_read((tainted 1))]
>
>
> pHeadItem = (klog_t *) DivasLogFifoRead();
>
> if (pHeadItem)
> {
>
> Error --->
> memcpy(pClientLogBuffer, pHeadItem, sizeof(klog_t));
> kfree(pHeadItem);
> return sizeof(klog_t);
> }
> ---------------------------------------------------------
> [BUG] file_operations.write -> cm_write -> trans_ac3. write can take tainted. write can take tainted inputs.
> /home/junfeng/linux-tainted/sound/oss/cmpci.c:593:trans_ac3: ERROR:TAINTED:593:593: dereferencing tainted ptr 'src' [Callstack: /home/junfeng/linux-tainted/fs/read_write.c:307:vfs_write((tainted 1)(tainted 2)) -> /home/junfeng/linux-tainted/fs/read_write.c:241:cm_write((tainted 1)(tainted 2)) -> /home/junfeng/linux-tainted/sound/oss/cmpci.c:1662:trans_ac3((tainted 2))]
>
> unsigned long data;
> unsigned long *dst = (unsigned long *) dest;
> unsigned short *src = (unsigned short *)source;
>
> do {
>
> Error --->
> data = (unsigned long) *src++;
> data <<= 12; // ok for 16-bit data
> if (s->spdif_counter == 2 || s->spdif_counter == 3)
> data |= 0x40000000; // indicate AC-3 raw data
> ---------------------------------------------------------
> [BUG] in ioctl function. v (==arg) is not checked at all. can write arbitrary data to the kernel. on the same case branch, copy_to_user is called on arg
> /home/junfeng/linux-tainted/drivers/media/radio/radio-cadet.c:397:cadet_do_ioctl: ERROR:TAINTED:397:397: dereferencing tainted ptr 'v' [Callstack: ]
>
> {
> case VIDIOCGCAP:
> {
> struct video_capability *v = arg;
> memset(v,0,sizeof(*v));
>
> Error --->
> v->type=VID_TYPE_TUNER;
> v->channels=2;
> v->audios=1;
> strcpy(v->name, "ADS Cadet");
> ---------------------------------------------------------
> [BUG] no check in sis_main.c at all. can write arbitrary data to kernel
> /home/junfeng/linux-tainted/drivers/video/sis/sis_main.c:2476:sisfb_ioctl: ERROR:TAINTED:2476:2476: dereferencing tainted ptr 'x' [Callstack: /home/junfeng/linux-tainted/drivers/video/sstfb.c:808:sisfb_ioctl((tainted 3))]
>
> }
> case FBIOPUT_MODEINFO:
> {
> struct mode_info *x = (struct mode_info *)arg;
>
>
> Error --->
> ivideo.video_bpp = x->bpp;
> ivideo.video_width = x->xres;
> ivideo.video_height = x->yres;
> ivideo.video_vwidth = x->v_xres;
> ---------------------------------------------------------
> [BUG] on VIDIOCGCAPUTRE and VIDIOCSCAPUTRE branches copy_*_user functions are called. on other branches not
> /home/junfeng/linux-tainted/drivers/media/video/cpia.c:3432:cpia_do_ioctl: ERROR:TAINTED:3432:3432: dereferencing tainted ptr 'vp' [Callstack: ]
>
> DBG("VIDIOCSPICT\n");
>
> /* check validity */
> DBG("palette: %d\n", vp->palette);
> DBG("depth: %d\n", vp->depth);
>
> Error --->
> if (!valid_mode(vp->palette, vp->depth)) {
> retval = -EINVAL;
> break;
> }
> ---------------------------------------------------------
> [BUG] sisfb_ioctl->sis_dispinfo. drivers/video/sstfb_ioctl assumes "arg" is tainted. both of them are assigned to fb_ops.fb_ioctl
> /home/junfeng/linux-tainted/drivers/video/sis/sis_main.c:276:sis_dispinfo: ERROR:TAINTED:276:276: dereferencing tainted ptr 'rec' [Callstack: /home/junfeng/linux-tainted/drivers/video/sstfb.c:808:sisfb_ioctl((tainted 3)) -> /home/junfeng/linux-tainted/drivers/video/sis/sis_main.c:2488:sis_dispinfo((tainted 0))]
>
> gly->ngmask = size;
> }
>
> void sis_dispinfo(struct ap_data *rec)
> {
>
> Error --->
> rec->minfo.bpp = ivideo.video_bpp;
> rec->minfo.xres = ivideo.video_width;
> rec->minfo.yres = ivideo.video_height;
> rec->minfo.v_xres = ivideo.video_vwidth;
> ---------------------------------------------------------
> [BUG] mdc800_device_read is assigned to file_operations.read, which can take tainted inputs
> /home/junfeng/linux-tainted/drivers/usb/image/mdc800.c:750:mdc800_device_read: ERROR:TAINTED:750:750: passing tainted ptr 'ptr' to __memcpy [Callstack: /home/junfeng/linux-tainted/drivers/scsi/sg.c:362:mdc800_device_read((tainted 1))]
>
> }
> }
> else
> {
> /* memcpy Bytes */
>
> Error --->
> memcpy (ptr, &mdc800->out [mdc800->out_ptr], sts);
> ptr+=sts;
> left-=sts;
> mdc800->out_ptr+=sts;
> ---------------------------------------------------------
> [BUG] call usb_serial_debug_data on data
> /home/junfeng/linux-tainted/drivers/usb/serial/io_edgeport.c:1381:edge_write: ERROR:TAINTED:1381:1381: passing tainted ptr 'data' to usb_serial_debug_data [Callstack: ]
>
> fifo->head += secondhalf;
> // No need to check for wrap since we can not get to end of fifo in this part
> }
>
> if (copySize) {
>
> Error --->
> usb_serial_debug_data (__FILE__, __FUNCTION__, copySize, data);
> }
>
> send_more_port_data((struct edgeport_serial *)usb_get_serial_data(port->serial), edge_port);
> ---------------------------------------------------------
> [BUG] proc_dir_entry.read_proc can take tainted inputs
> /home/junfeng/linux-tainted/drivers/usb/media/vicam.c:1117:vicam_write_proc_gain: ERROR:TAINTED:1117:1117: passing tainted ptr 'buffer' to simple_strtoul [Callstack: /home/junfeng/linux-tainted/net/core/pktgen.c:991:vicam_write_proc_gain((tainted 1))]
>
> static int vicam_write_proc_gain(struct file *file, const char *buffer,
> unsigned long count, void *data)
> {
> struct vicam_camera *cam = (struct vicam_camera *)data;
>
>
> Error --->
> cam->gain = simple_strtoul(buffer, NULL, 10);
>
> return count;
> }
> ---------------------------------------------------------
> [BUG] midi_synth.c:midi_synth_ioctl does __copy_to_user(not copy_to_user?). it could be that there are some assumptions about the devices.
> /home/junfeng/linux-tainted/sound/oss/mpu401.c:792:mpu_synth_ioctl: ERROR:TAINTED:792:792: passing tainted ptr 'arg' to __constant_memcpy [Callstack: /home/junfeng/linux-tainted/sound/oss/midi_synth.c:270:mpu_synth_ioctl((tainted 2))]
>
>
> switch (cmd)
> {
>
> case SNDCTL_SYNTH_INFO:
>
> Error --->
> memcpy((&((char *) arg)[0]), (char *) &mpu_synth_info[midi_dev], sizeof(struct synth_info));
> return 0;
>
> case SNDCTL_SYNTH_MEMAVL:
> ---------------------------------------------------------
> [BUG] similar errors
> /home/junfeng/linux-tainted/drivers/media/radio/radio-cadet.c:399:cadet_do_ioctl: ERROR:TAINTED:399:399: dereferencing tainted ptr 'v' [Callstack: ]
>
> {
> struct video_capability *v = arg;
> memset(v,0,sizeof(*v));
> v->type=VID_TYPE_TUNER;
> v->channels=2;
>
> Error --->
> v->audios=1;
> strcpy(v->name, "ADS Cadet");
> return 0;
> }
> ---------------------------------------------------------
> [BUG] ioctl
> /home/junfeng/linux-tainted/drivers/usb/media/vicam.c:617:vicam_ioctl: ERROR:TAINTED:617:617: dereferencing tainted ptr 'vp' [Callstack: /home/junfeng/linux-tainted/drivers/scsi/sg.c:1002:vicam_ioctl((tainted 3))]
>
> struct video_picture *vp = (struct video_picture *) arg;
>
> DBG("VIDIOCSPICT depth = %d, pal = %d\n", vp->depth,
> vp->palette);
>
>
> Error --->
> cam->gain = vp->brightness >> 8;
>
> if (vp->depth != 24
> || vp->palette != VIDEO_PALETTE_RGB24)
> ---------------------------------------------------------
> [BUG] copy_to_user is called on case VIDIOCGCHAN
> /home/junfeng/linux-tainted/drivers/media/video/bw-qcam.c:763:qcam_do_ioctl: ERROR:TAINTED:763:763: dereferencing tainted ptr 'p' [Callstack: ]
>
> return 0;
> }
> case VIDIOCGPICT:
> {
> struct video_picture *p = arg;
>
> Error --->
> p->colour=0x8000;
> p->hue=0x8000;
> p->brightness=qcam->brightness<<8;
> p->contrast=qcam->contrast<<8;
> ---------------------------------------------------------
> [BUG]
> /home/junfeng/linux-tainted/drivers/media/video/bw-qcam.c:723:qcam_do_ioctl: ERROR:TAINTED:723:723: dereferencing tainted ptr 'v' [Callstack: ]
>
> case VIDIOCGCHAN:
> {
> struct video_channel *v = arg;
> if(v->channel!=0)
> return -EINVAL;
>
> Error --->
> v->flags=0;
> v->tuners=0;
> /* Good question.. its composite or SVHS so.. */
> v->type = VIDEO_TYPE_CAMERA;
> ---------------------------------------------------------
> [BUG] file_opetations.ioctl -> aac_cfg_ioctl -> aac_do_ioctl -> close_getadapter_fib -> aac_close_fib_context. also, check_revision calls copy_to_user on "arg"
> /home/junfeng/linux-tainted/drivers/scsi/aacraid/commctrl.c:277:aac_close_fib_context: ERROR:TAINTED:277:277: dereferencing tainted ptr 'fibctx' [Callstack: /home/junfeng/linux-tainted/drivers/scsi/sg.c:1002:aac_cfg_ioctl((tainted 3)) -> /home/junfeng/linux-tainted/drivers/scsi/aacraid/linit.c:671:aac_do_ioctl((tainted 2)) -> /home/junfeng/linux-tainted/drivers/scsi/aacraid/commctrl.c:421:close_getadapter_fib((tainted 1)) -> /home/junfeng/linux-tainted/drivers/scsi/aacraid/commctrl.c:348:aac_close_fib_context((tainted 1))]
>
> while (!list_empty(&fibctx->fibs)) {
> struct list_head * entry;
> /*
> * Pull the next fib from the fibs
> */
>
> Error --->
> entry = fibctx->fibs.next;
> list_del(entry);
> fib = list_entry(entry, struct hw_fib, header.FibLinks);
> fibctx->count--;
> ---------------------------------------------------------
> [BUG] zoran_read and vbi_read are both assigned to video_device.read, while zoran_read assumes "buf" is tainted
> /home/junfeng/linux-tainted/drivers/media/video/zr36120.c:1698:vbi_read: ERROR:TAINTED:1698:1698: dereferencing tainted ptr 'optr' [Callstack: /home/junfeng/linux-tainted/drivers/media/video/zr36120.c:934:vbi_read((tainted 1))]
>
> {
> /* copy to doubled data to userland */
> for (x=0; optr+1<eptr && x<-done->w; x++)
> {
> unsigned char a = iptr[x*2];
>
> Error --->
> *optr++ = a;
> *optr++ = a;
> }
> /* and clear the rest of the line */
> ---------------------------------------------------------
> [BUG] video1394_ioctl's param arg is tainted -> initialize_dma_it_prg_var_packet_queue's param packet_sizes is also tainted
> /home/junfeng/linux-tainted/drivers/ieee1394/video1394.c:668:initialize_dma_it_prg_var_packet_queue: ERROR:TAINTED:668:668: dereferencing tainted ptr 'packet_sizes + i * 4' [Callstack: /home/junfeng/linux-tainted/drivers/ieee1394/video1394.c:1047:initialize_dma_it_prg_var_packet_queue((tainted 2))]
>
> for (i = 0; i < d->nb_cmd; i++) {
> unsigned int size;
> if (packet_sizes[i] > d->packet_size) {
> size = d->packet_size;
> } else {
>
> Error --->
> size = packet_sizes[i];
> }
> it_prg[i].data[1] = cpu_to_le32(size << 16);
> it_prg[i].end.control = cpu_to_le32(DMA_CTL_OUTPUT_LAST | DMA_CTL_BRANCH);
> ---------------------------------------------------------
> [BUG] sound/pci/rme9652/rme9652.c:snd_rme9652_capture_copy treats the parm "dst" as tainted and they are both assigned to snd_pcm_ops_t.copy
> /home/junfeng/linux-tainted/sound/pci/es1938.c:833:snd_es1938_capture_copy: ERROR:TAINTED:833:833: passing tainted ptr 'dst' to __constant_memcpy [Callstack: /home/junfeng/linux-tainted/sound/pci/rme9652/rme9652.c:2010:snd_es1938_capture_copy((tainted 3))]
>
> es1938_t *chip = snd_pcm_substream_chip(substream);
> pos <<= chip->dma1_shift;
> count <<= chip->dma1_shift;
> snd_assert(pos + count <= chip->dma1_size, return -EINVAL);
> if (pos + count < chip->dma1_size)
>
> Error --->
> memcpy(dst, runtime->dma_area + pos + 1, count);
> else {
> memcpy(dst, runtime->dma_area + pos + 1, count - 1);
> ((unsigned char *)dst)[count - 1] = runtime->dma_area[0];
> ---------------------------------------------------------
> [BUG] proc_dir_entry.write_proc
> /home/junfeng/linux-tainted/drivers/media/video/zoran_procfs.c:122:zoran_write_proc: ERROR:TAINTED:122:122: passing tainted ptr 'buffer' to __memcpy [Callstack: /home/junfeng/linux-tainted/net/core/pktgen.c:991:zoran_write_proc((tainted 1))]
>
> string = sp = vmalloc(count + 1);
> if (!string) {
> printk(KERN_ERR "%s: write_proc: can not allocate memory\n", zr->name);
> return -ENOMEM;
> }
>
> Error --->
> memcpy(string, buffer, count);
> string[count] = 0;
> DEBUG2(printk(KERN_INFO "%s: write_proc: name=%s count=%lu data=%x\n", zr->name, file->f_dentry->d_name.name, count, (int) data));
> ldelim = " \t\n";
> ---------------------------------------------------------
> [BUG] proc_dir_entry.write_proc
> /home/junfeng/linux-tainted/drivers/pnp/pnpbios/proc.c:190:proc_write_node: ERROR:TAINTED:190:190: passing tainted ptr 'buf' to __memcpy [Callstack: /home/junfeng/linux-tainted/net/core/pktgen.c:991:proc_write_node((tainted 1))]
>
> if (!node) return -ENOMEM;
> if ( pnp_bios_get_dev_node(&nodenum, boot, node) )
> return -EIO;
> if (count != node->size - sizeof(struct pnp_bios_node))
> return -EINVAL;
>
> Error --->
> memcpy(node->data, buf, count);
> if (pnp_bios_set_dev_node(node->handle, boot, node) != 0)
> return -EINVAL;
> kfree(node);
> ---------------------------------------------------------
> [BUG] file_operations.write
> /home/junfeng/linux-tainted/drivers/usb/image/mdc800.c:805:mdc800_device_write: ERROR:TAINTED:805:805: dereferencing tainted ptr 'buf + i' [Callstack: /home/junfeng/linux-tainted/drivers/media/dvb/av7110/av7110.c:3858:mdc800_device_write((tainted 1))]
>
> }
>
> /* save command byte */
> if (mdc800->in_count < 8)
> {
>
> Error --->
> mdc800->in[mdc800->in_count]=buf[i];
> mdc800->in_count++;
> }
> else
> ---------------------------------------------------------
> [BUG] proc_dir_entry.write_proc can take tainted inputs
> /home/junfeng/linux-tainted/drivers/usb/media/vicam.c:1107:vicam_write_proc_shutter: ERROR:TAINTED:1107:1107: passing tainted ptr 'buffer' to simple_strtoul [Callstack: /home/junfeng/linux-tainted/net/core/pktgen.c:991:vicam_write_proc_shutter((tainted 1))]
>
> static int vicam_write_proc_shutter(struct file *file, const char *buffer,
> unsigned long count, void *data)
> {
> struct vicam_camera *cam = (struct vicam_camera *)data;
>
>
> Error --->
> cam->shutter_speed = simple_strtoul(buffer, NULL, 10);
>
> return count;
> }
> ---------------------------------------------------------
> [BUG] av7110_ir_write_proc is assigned to proc_dir_entry.write_proc
> /home/junfeng/linux-tainted/drivers/media/dvb/av7110/av7110_ir.c:116:av7110_ir_write_proc: ERROR:TAINTED:116:116: passing tainted ptr 'buffer' to __constant_memcpy [Callstack: /home/junfeng/linux-tainted/net/core/pktgen.c:991:av7110_ir_write_proc((tainted 1))]
>
> u32 ir_config;
>
> if (count < 4 + 256 * sizeof(u16))
> return -EINVAL;
>
>
> Error --->
> memcpy (&ir_config, buffer, 4);
> memcpy (&key_map, buffer + 4, 256 * sizeof(u16));
>
> av7110_setup_irc_config (NULL, ir_config);
> ---------------------------------------------------------
> [BUG] pointer (rdwr_arg.msgs[i]) points to user space
> /home/junfeng/linux-tainted/drivers/i2c/i2c-dev.c:249:i2cdev_ioctl: ERROR:TAINTED:249:249: dereferencing tainted ptr 'rdwr_arg.msgs + i * 12' [Callstack: ]
>
> }
> while(i-- > 0)
> {
> if( res>=0 && (rdwr_pa[i].flags & I2C_M_RD))
> {
>
> Error --->
> if(copy_to_user(
> rdwr_arg.msgs[i].buf,
> rdwr_pa[i].buf,
> rdwr_pa[i].len))
> ---------------------------------------------------------
> [BUG] ioctl
> /home/junfeng/linux-tainted/sound/oss/awe_wave.c:2049:awe_ioctl: ERROR:TAINTED:2049:2049: passing tainted ptr 'arg' to __constant_memcpy [Callstack: /home/junfeng/linux-tainted/sound/oss/midi_synth.c:270:awe_ioctl((tainted 2))]
>
> case SNDCTL_SYNTH_INFO:
> if (playing_mode == AWE_PLAY_DIRECT)
> awe_info.nr_voices = awe_max_voices;
> else
> awe_info.nr_voices = AWE_MAX_CHANNELS;
>
> Error --->
> memcpy((char*)arg, &awe_info, sizeof(awe_info));
> return 0;
> break;
>
>

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