Re: namei and path canonicalization

[christos%zoulas.com@localhost (Christos Zoulas)]

On Nov 8,  3:12am, dholland-tech%netbsd.org@localhost (David Holland) wrote:
-- Subject: Re: namei and path canonicalization

| 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?

I am not sure if we go that far; this information is not used...

christos