[arch-projects] [mkinitcpio] overwrite files/symlinks

[Dave Reisner]

On Wed, Jul 18, 2012 at 07:27:50PM +0200, Christian Hesse wrote:
> Dave Reisner <d at falconindy.com> on Wed, 2012/07/18 13:10:
> > On Wed, Jul 18, 2012 at 07:03:44PM +0200, Christian Hesse wrote:
> > > Hello everybody,
> > > 
> > > I added a hook to the initramfs whose install script added 'uname' by
> > > using add_binary. This resulted in major breakage and a kernel panicing
> > > on boot.
> > > 
> > > I suppose this is because there is a symlink from uname to busybox - with
> > > adding uname I killed the busybox binary. Is this ok by design or do we
> > > want to raise an error if something like this happens?
> > > 
> > > I created a patch (see attachment). Does this make sense?
> > 
> > Nope, it doesn't make sense. We overwrite a busybox symlink in the
> > shutdown hook (cp, since we need the -a flag), and this isn't a problem.
> 
> Ah, my fault...
> 
> I added my hook before base in HOOKS array. This way bin was a real directory
> instead of a symlink to usr/bin.

Yup, I figured this is what you did. Incidentally, this particular
user-induced bug should be fixed by a commit I just pushed a few hours
ago:

http://projects.archlinux.org/mkinitcpio.git/commit/?id=5f81d06e8b

> (Note to self: Never do silly things. ;)
> -- 
> main(a){char*c=/*    Schoene Gruesse                         */"B?IJj;MEH"
> "CX:;",b;for(a/*    Chris           get my mail address:    */=0;b=c[a++];)
> putchar(b-1/(/*               gcc -o sig sig.c && ./sig    */b/42*2-3)*42);}