lkml.org 
[lkml]   [2004]   [Apr]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH/RFC] don't support %n in printk
Hi!

> The printf man page has this to say about '%n':
>
> "The number of characters written so far is stored into the integer
> indicated by the int * (or variant) pointer argument. No argument
> is converted."
>
> Very little code actually uses %n for that. Now days, %n has a much
> more common use - in printf format string exploits. Since no kernel
> code appears to be using %n (thus said grep), this patch removes
> support for it. To preempt the obvious argument, I agree that printk
> should look and behave as much as possible as printf - except where
> it's harmful. We don't support floating point, for example, and I
> doubt we should support %n - although I don't strongly care one way or
> another.

You probably should search the kernel for any uses of %n and fix
them...
Pavel

--
When do you have a heart between your knees?
[Johanka's followup: and *two* hearts?]
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:02    [W:0.036 / U:2.564 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site