On Thu, 2007-06-21 at 19:46 +0200, Alexander Wuerstlein wrote:
> On 070621 19:33, Arjan van de Ven <[email protected]> wrote:
> > On Thu, 2007-06-21 at 19:25 +0200, Alexander Wuerstlein wrote:
> > > On 070621 19:21, Arjan van de Ven <[email protected]> wrote:
> > > > On Thu, 2007-06-21 at 18:02 +0200, Alexander Wuerstlein wrote:
> > > > > Modified task_struct to hold a 'signed flag' which is set on exec(), inherited
> > > > > on fork() and checked during exec before giving the new process suid/sgid
> > > > > privileges.
> > > > >
> > > >
> > > >
> > > >
> > > > do you also check the signature of glibc and every other shared library
> > > > that the app uses (or dlopens)? if not.. the entire exercise is rather
> > > > pointless...
> > >
> > > We do check that, that is patch [3/4].
> > >
> > > Of course we can only check mmap-ed files, if there is no file like with JIT
> > > compilers we are out of luck.
> >
> > or if the process uses read() not mmap().
>
> If a process uses read() it needs some executable and writable memory. We do
> check for this in mprotect(). There is a problem with the i386-architecture,
> because it allows execution of any readable page (except with newer
> processors). But beyond that ugliness of i386, it should not be possible to
> execute anything without us noticing it (hopefully).
welcome to mprotect() where the app can just change the permissions
--
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