Re: namei and path canonicalization

[David Holland <dholland-tech%netbsd.org@localhost>]

On Tue, Nov 07, 2017 at 11:11:16PM +0000, Christos Zoulas wrote:
 > In article <20171107222924.GE17761%netbsd.org@localhost>,
 > David Holland  <dholland-tech%netbsd.org@localhost> wrote:
 > >
 > >Also it occurs to me that there's no reason for the kernel to do the
 > >getcwd call; it should just provide the argument given to exec in all
 > >cases, and ld.so can do the getcwd call itself if necessary (if the
 > >string it finds doesn't begin with '/') when/if something uses
 > >$ORIGIN.
 > 
 > The kernel does not need to do the getcwd() call, but someone (rtld) will
 > eventually do it for $ORIGIN, either lazily or always.

Right -- hopefully it can be done lazily, i.e. often not at all.

 > As for killing $ORIGIN for setuid programs, this is already in the ELF
 > specification:

Sure, but shouldn't we also not pass AT_SUN_EXECNAME for setugid programs?

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