lkml.org 
[lkml]   [2009]   [Dec]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH v6] Added PR_SET_PROCTITLE_AREA option for prctl()
On Tue, Dec 8, 2009 at 12:38 AM, Ingo Molnar <mingo@elte.hu> wrote:
>
> * KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> wrote:
>
>> > The feature looks useful, but the choice of a prctl as an API is strange
>> > - it limits us to the current task only - while the ability to set
>> > arguments for another task looks a more generic (and potentially more
>> > useful) solution.
>>
>> No. It's impossible.
>> /proc/{pid}/cmdline read user process's memory. iow, this prctl() don't
>> receive string, it receive virtual address itself. [...]
>
> it's not 'impossible' at all, you yourself mention ptrace:

If another process is going to use ptrace to inject the cmdline string
into the victim's address space, it can also temporarily hijack a
thread to run prctl() on its behalf...


\
 
 \ /
  Last update: 2009-12-08 07:31    [W:0.382 / U:0.724 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site