lkml.org 
[lkml]   [2011]   [Jun]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH 1/2] proc: restrict access to /proc/PID/io
From
On Fri, Jun 24, 2011 at 5:38 PM, Vasiliy Kulikov <segoon@openwall.com> wrote:
> /proc/PID/io may be used for gathering private information.  E.g. for
> openssh and vsftpd daemons wchars/rchars may be used to learn the
> precise password length.  Restrict it to processes being able to ptrace
> the target process.
>

Hmm.. How do I reproduce this, won't they be enough randomness around
rchar/wchar by the time the attacker reads it?

> ptrace_may_access() is needed to prevent keeping open file descriptor of
> "io" file, executing setuid binary and gathering io information of the
> setuid'ed process.

Balbir Singh
--
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: 2011-06-28 03:25    [W:0.128 / U:0.424 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site