[uml-devel] Ported SKAS3-v7 (and partially -V8) for 2.6.11. Uncleanness about SYSEMU_SINGLESTEP

[Blaisorblade <blaisorblade@yahoo.it>]

On Wednesday 09 February 2005 18:33, Gerd Knorr wrote:
> > > Anyone looked at 2.6.11-rc1 for the host?  Some more ptrace cleanups
> >
> > I've already solved those conflict earlier on -rc1 (not tested) but I
> > didn't polish it out yet... if you are in a hurry, I can finish it and
> > post the result today on the ML. If not, I'll publish it later.
>
> Was busy with other stuff recently, but next days I plan to look at this
> again.  I've seen you released skas v8 meanwhile, but for 2.6.9 only.
> If you have a 2.6.11-rc patch as well already that would be very nice.
I've just done a -V7 for -rc3-bk6... I've called it -V7-rc1 because 
potentially something could go wrong (in general, and for this special 
kernel).

I've also added three patches from the V8-rc1 for 2.6.9 (so it's actually a 
-V7a: versioning is fscking up). I've not yet added the SYSEMU_SINGLESTEP 
support, because it seemed me a bit unclean even in 2.6.9, so even porting it 
cleanly to 2.6.10 is a bit hard (C. Aker did the porting, and , but in that 
form it is not up-to-date with the introduction of the set/clear_singlestep 
accessors).

The problem is that PTRACE_SYSEMU_SINGLESTEP is put together with 
PTRACE_SYSCALL, not with PTRACE_SINGLESTEP... I understand in 2.6.7 it maybe 
made sense (SINGLESTEP had a different behaviour then, problems when 
singlestepping syscalls) but it's unclean in 2.6.9 and does not port well to 
2.6.10, as said (... unless I miss something, I'm going to cleanup this for 
2.6.9 and for 2.6.10.

For 2.6.7 I would rawly use your version, unless I discovered any bugs during 
the cleanup (backporting cleanups is useless IMHO, unless for other reasons 
like keeping things in sync).
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729
http://www.user-mode-linux.org/~blaisorblade




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