man, 2001-11-19 kl. 17:34 skrev Rock Gordon:
> All said and done, the file is with correct
> permissions (for that matter any binary that I execute
> on my filesystem has correct permissions). The only
> thing strace tells me is "bad file format". The same
> binary works perfectly elsewhere.
>
> I don't think mmap is the problem; you don't need it
> in order to run binaries ...
>
Yes you do. See load_elf_binary in fs/binfmt_elf.c, or
load_aout_binary in fs/binfmt_aout.c.....
> --- Terje Eggestad <terje.eggestad@scali.no> wrote:
> > On Sat, 17 Nov 2001, Rock Gordon wrote:
> >
> > > Hi,
> > >
> > > I've written a modest filesystem for fun, it works
> > > pretty ok, but when I try to execute binaries from
> > it,
> > > bash says "cannot execute binary file" ... If I
> > copy
> > > the same binary elsewhere, it executes perfectly.
> > >
> > > Does anybody have any clue ?
> >
> > Yes
> >
> > keep in mind taht the kernel do demand paging of the
> > text (code) in our
> > executable, meaning that a page of code is not
> > loaded into the procs
> > memory spce (and thus phys mem) until the proc
> > actually tries to exec the
> > code page. This is one manifestation of the funny
> > term "page fault"!
> >
> > I do belive that the current kernel uses mmap to map
> > in the exec file text
> > segment. (Even if I can hear the ice cracking under
> > my feet, never
> > actually looked at the code handling execs) but if
> > you strace anexec that
> > uses shared libs you'll note that the sh.libs are
> > mmaped into the process
> > space. (also note the MMAP_EXEC flag in the mmap(2)
> > man page).
> >
> >
> > TJ
> >
> > >
> > > Regards,
> > > Rock
> > >
> > > __________________________________________________
> > > Do You Yahoo!?
> > > Find the one for you at Yahoo! Personals
> > > http://personals.yahoo.com
> > > -
> > > To unsubscribe from this list: send the line
> > "unsubscribe linux-kernel" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at
> > http://vger.kernel.org/majordomo-info.html
> > > Please read the FAQ at http://www.tux.org/lkml/
> > >
> >
> > --
> >
> _________________________________________________________________________
> >
> > Terje Eggestad
> > terje.eggestad@scali.no
> > Scali Scalable Linux Systems http://www.scali.com
> >
> > Olaf Helsets Vei 6 tel: +47 22 62 89
> > 61 (OFFICE)
> > P.O.Box 70 Bogerud +47 975 31
> > 574 (MOBILE)
> > N-0621 Oslo fax: +47 22 62 89
> > 51
> > NORWAY
> >
> _________________________________________________________________________
> >
>
>
> __________________________________________________
> Do You Yahoo!?
> Find the one for you at Yahoo! Personals
> http://personals.yahoo.com
-- _________________________________________________________________________Terje Eggestad terje.eggestad@scali.no Scali Scalable Linux Systems http://www.scali.com
Olaf Helsets Vei 6 tel: +47 22 62 89 61 (OFFICE) P.O.Box 70 Bogerud +47 975 31 574 (MOBILE) N-0621 Oslo fax: +47 22 62 89 51 NORWAY _________________________________________________________________________
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Nov 23 2001 - 21:00:23 EST