Re: $ORIGIN

To: tech-toolchain%netbsd.org@localhost
Subject: Re: $ORIGIN
From: David Holland <dholland-tech%netbsd.org@localhost>
Date: Mon, 27 Jan 2014 07:05:21 +0000

On Sun, Jan 26, 2014 at 11:54:07AM +0000, David Laight wrote:
 > The problem with caching the path is that it might contain symlinks
 > that the user can change - which means that it isn't save to use
 > $ORIGIN in suid binaries.
 > 
 > Whereas the kernel has vnode of the directory where the file has found,
 > so should be able to refcount it. An open relative to that vnode is
 > safe (and fast) even for suid programs.

Unfortunately, the ELF $ORIGIN doesn't work that way.

-- 
David A. Holland
dholland%netbsd.org@localhost

References:
- Re: $ORIGIN
  - From: Matt Thomas
- re: $ORIGIN
  - From: matthew green
- Re: $ORIGIN
  - From: David Laight

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