lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <50BFF19E.1040405@asianux.com>
Date:	Thu, 06 Dec 2012 09:15:10 +0800
From:	Chen Gang <gang.chen@...anux.com>
To:	chas williams - CONTRACTOR <chas@....nrl.navy.mil>
CC:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [Suggestion] net/atm : for sprintf, need check the total write
 length whether larger than a page.

于 2012年12月05日 22:55, chas williams - CONTRACTOR 写道:
> On Wed, 05 Dec 2012 13:59:26 +0800
> 
> it doesn't seem like optimizing for this corner case is a huge
> concern.  the list cannot be infinitely long.
> 

  ok.


>>>>
>>>> By the way:
>>>>   will it be better that always let "\n" at the end ?
>>>>   (if count == PAGE_SIZE in a loop, we can not let "\n" at the end).
>>>
>>>    oh, sorry ! count will never >= PAGE_SIZE.
>>>
>>>    I think let "PAGE_SIZE - 2" instead of "PAGE_SIZE" in the loop, so we
>>> can make the room for the end of "\n".
>>>
>>>
>>>
>>    sorry, "PAGE_SIZE - 1" is enough, not need "PAGE_SIZE - 2".
> 
> did you mean '\0' instead of '\n'?  scnprintf() considers the trailing
> '\0' when formatting.

  no, originally, the end is "\n\0".

  I prefer we still compatible "\n" when the contents are very large.
  if count already == (PAGE_SIZE - 1), we have no chance to append "\n" to the end.

-		pos += sprintf(pos, "\n");
+		count += scnprintf(buf + count, PAGE_SIZE - count, "\n");


> --
> To unsubscribe from this list: send the line "unsubscribe netdev" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> 
> 


-- 
Chen Gang

Asianux Corporation
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ