linux-kernel - Re: Feature request: exec self for NOMMU.

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]

Date:	Wed, 27 Dec 2006 16:03:38 -0500
From:	Rob Landley <rob@...dley.net>
To:	Denis Vlasenko <vda.linux@...glemail.com>
Cc:	ray-gmail@...rabbit.org, linux-kernel@...r.kernel.org,
	"David McCullough" <david_mccullough@...securecomputing.com>
Subject: Re: Feature request: exec self for NOMMU.

On Wednesday 27 December 2006 1:35 pm, Denis Vlasenko wrote:
> This solves chroot problem. How to find path-to-yourself reliably
> (for one, without using /proc/self/exe) is not obvious to me.

Been there, done that.  Both my toybox and Firmware Linux projects do this.  
In FWL it's line 115 of this file:
http://landley.net/hg/firmware?f=937346748ff4;file=sources/toys/gcc-uClibc.c

It's essentially the logic of the command line "which" utility applied to 
argv[0].  If argv[0] has a relative or absolute path, then it's vs cwd (this 
has to happen when you first run the program, before you cd).  If argv[0] has 
no path then look at $PATH.

Rob
-- 
"Perfection is reached, not when there is no longer anything to add, but
when there is no longer anything to take away." - Antoine de Saint-Exupery
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/