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SubjectRe: [PATCH] coredump - as root not only if euid switched
* Peter Wächtler (pwaechtler@mac.com) wrote:
> Am Do, 2004-04-22 um 11.56 schrieb Andrew Morton:
> > Peter Waechtler <pwaechtler@mac.com> 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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