linux-kernel - Re: [Suggestion] drivers/staging/tidspbridge: strcpy and strncpy, src length checking issue.

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Date:	Mon, 31 Dec 2012 11:28:24 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	Omar Ramirez Luna <omar.ramirez@...itl.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [Suggestion] drivers/staging/tidspbridge:  strcpy and strncpy,
  src length checking issue.

Hi Omar Ramirez Luna:

Since you are really too busy.
  is it suitable to send a patch for it, by me ?

  no reply within a week, means it is suitable.

  :-)

gchen.


于 2012年12月14日 11:50, Chen Gang 写道:
> Hello Omar Ramirez Luna:
> 
>   in drivers/staging/tidspbridge/rmgr/proc.c:
> 
>     if strlen(drv_datap->base_img) == size, will pass checking (line 397)
>     the size is the full length of exec_file (line 382, line 468..469)
>     strcpy causes issue: src len is strlen(drv_datap->base_img) + '\0'. (line 400)
> 
>     strncpy seems also has issue: need use size instead of strlen(iva_img) + 1. (line 402..403)
> 
>   please help to check, thanks.
> 
> gchen.
> 
> 
>  380 static int get_exec_file(struct cfg_devnode *dev_node_obj,
>  381                                 struct dev_object *hdev_obj,
>  382                                 u32 size, char *exec_file)
>  383 {
>  384         u8 dev_type;
>  385         s32 len;
>  386         struct drv_data *drv_datap = dev_get_drvdata(bridge);
>  387 
>  388         dev_get_dev_type(hdev_obj, (u8 *) &dev_type);
>  389 
>  390         if (!exec_file)
>  391                 return -EFAULT;
>  392 
>  393         if (dev_type == DSP_UNIT) {
>  394                 if (!drv_datap || !drv_datap->base_img)
>  395                         return -EFAULT;
>  396 
>  397                 if (strlen(drv_datap->base_img) > size)
>  398                         return -EINVAL;
>  399 
>  400                 strcpy(exec_file, drv_datap->base_img);
>  401         } else if (dev_type == IVA_UNIT && iva_img) {
>  402                 len = strlen(iva_img);
>  403                 strncpy(exec_file, iva_img, len + 1);
>  404         } else {
>  405                 return -ENOENT;
>  406         }
>  407 
>  408         return 0;
>  409 }
>  410 
>  ...
> 
>  465         /* Get the default executable for this board... */
>  466         dev_get_dev_type(hdev_obj, (u8 *) &dev_type);
>  467         p_proc_object->processor_id = dev_type;
>  468         status = get_exec_file(dev_node_obj, hdev_obj, sizeof(sz_exec_file),
>  469                                sz_exec_file);
> 


-- 
Chen Gang

Asianux Corporation
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