Messages in this thread | | | Date | Mon, 11 Jun 2001 14:19:18 +0200 | From | Christoph Hellwig <> | Subject | Re: [patch] sys_modify_ldt extension (default_ldt) |
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Hi Joerg,
In article <m158sRu-0009RiC@hydrops.han.de> you wrote: > Hi, > > I am trying to integrate binfmt_xout.c into kernel 2.4 as part of the > linux-abi project (formerly known as iBCS). For old Xenix 286 binaries the > lcall7 gate needs to part of the LDT. > > In kernels 2.0 sys_modify_ldt(0,...) used to return the default_ldt (with > lcall7 gate) if there were no segments set up. This behaviour changed in > kernels 2.2 . As a result of a discussion with Linus, David Bruce wrote a > patch for binfmt_xout.c tweaking with gdt and current->tss.ldt to get the > address of default_ldt. This patch does not work any more with kernels 2.4 > as tss vanished from task_struct. > > I do see 4 ways to cope with this problem: > > a) extend sys_modify_ldt with a function to retrieve the default_ldt. I did > this for testing (see attached diff for arch/i386/kernel/ldt.c ).
Looks sane to me.
> b) do some work an Davids patch but this is kind of magic for me :-) > (see attached default_ldt patch) > > c) loose the option to compile binfmt_xout (and the rest of linux-abi) as > module and simply use the symbol default_ldt. I dint't try that.
As the linux-abi maintainer I do not think that's a good idea..
> d) Forget about those old fashioned 286 binaries. This option will make some > linux users feel sad, as they run these progs for their daily business.
If possible at all I'll vote for having 286 support.
I'll integrate the patch into the linux-abi tree if you also send me the other changes (mostly binfmt_xout.c changes I suppose).
Christoph
-- Of course it doesn't work. We've performed a software upgrade. - 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/
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