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

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Date:	Fri, 14 Dec 2012 11:50:10 +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: [Suggestion] drivers/staging/tidspbridge:  strcpy and strncpy,  src
 length checking issue.

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);

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