lkml.org 
[lkml]   [2003]   [Aug]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: Doubt: core not dumped when binary give up root privileges.
From
Date
On Gwe, 2003-08-22 at 20:25, Alexandre Pereira Nunes wrote:
> The program explicitly sets RLIMIT_CORE to RLIM_INFINITY when still
> running with uid 0.

The kernel assumes a core image from something that was priviledged may
be unsafe.

> If instead of calling the program as root, I call it from the non-priv
> uid in question, if it crashes, it dumps core on the mentioned dir.
> That's the desired behaviour, since I can then take the core and debug.
> But if I run it as root (in fact, I would have to), and it crashes (or
> is forced to ,by means of kill -SEGV), after it gives up root
> credentials, it won't leave a core dump file, which in turn means I
> cannot debug it later.
>
> Any ideas?

2.4-ac has support for enabling setuid core dumps and setting the dump
path, so you can write such dumps to /root/dumps and the kernel will
make them root accessible only.

The 2.6 test tree and Marcelo 2.4 don't currently support this

-
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 13:48    [W:0.054 / U:0.296 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site