Re: [PATCH] coredump - as root not only if euid switched

[Chris Wright]

* Peter Wächtler (pwaechtler@xxxxxxx) wrote:
> Am Do, 2004-04-22 um 11.56 schrieb Andrew Morton:
> > Peter Waechtler <pwaechtler@xxxxxxx> wrote:
> > >
> > >  >(why are you trying to unlink the old file anyway?)
> > >  >
> > > 
> > >  For security measure :O
> > >  I tried on solaris: touch the core file as user, open it and wait, dump core
> > >  as root -> nope, couldn't read the damn core - it was unlinked and created!
> > 
> > hm, OK.  There's a window in which someone can come in and recreate the
> > file, but the open is using O_EXCL|O_CREATE so that seems safe enough.
> 
> So here is the updated patch with an open coded call to sys_unlink

This patch breaks various ptrace() checks.

thanks,
-chris
-- 
Linux Security Modules     http://lsm.immunix.org     http://lsm.bkbits.net
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