Bug#1770: xntp dumps core with kernel 1.3.35
Andrew Howell's mail:
>
> Austin Donnelly writes:
> > Package: xntp
> > Version: 3.4x-1
> >
> > The 'struct timex' structure has changed in the newser 1.3.x kernels
> > (for x approx > 28 or so, I'm told).
> >
> > This means that xntpd binaries compiled agains old kernels dumps core
> > on startup.
> >
> > I'm told that version 3.4t has support for the latest linux, but I
> > haven't tried it.
>
> I haven't been able to find 3.4t, it's not on louie.udel.edu. If it does
> exist I'd be happy for someone to point me to it :)
I just stepped over this problem; in my opinion it's not a problem of
xntpd, but of libc 4.6.27, adjtime().
I think libc 4.6.27 was compiled with an older kernel; in the meantime,
the struct timex was enlarged.
In libc-4.6.27/sysdeps/linux/__adjtime.c, a
local variable
struct timex tntx
is used and
adjtimex(&tntx)
gets called.
As the kernel now writes behind the end of tntx, the stack gets
corrupted.
The problem should go away if a libc 4.6.27 compiled with the new struct
timex gets used.
See also libc-4.6.27/README.distributors.
> > Also, there is the problem that there would need to be _2_ xntp
> > packages, one for old kernels, one for new kernels. Eugh!!
> >
> > Can anyone think of a better idea ?
>
> I've fixed this core dumping problem in xntp-3.4x-2. It seems to run fine
> under 1.2.x kernels as well.
Fine ... :-)
Regards
Herbert.
------------------------------------------------------------------------------
Dipl.-Ing. Herbert Thielen thielen@lpr.e-technik.tu-muenchen.de
Inst. for process control computers Phone ++49/89/2105-3554
Technical University of Munich, D-80290 Munich _____ Telefax ++49/89/2105-3555
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