Hi,
> I would not say this is a bug but let me repeat, no need to convince me.
>
> Please feel free to re-send the patch(es) I sent to maintainers. Sorry,
> I can't push these changes into Linus's tree.
So here again is the patch that I need so badly - clearly it fixes a bug
and harms nobody:
--
Hi Everyone,
> On 01/08, Pedro Alves wrote:
>>
>> On 12/04/2012 05:59 PM, Oleg Nesterov wrote:
>>
>> > But If we want to allow to trace vsyscall's, hw bp doesn't look very
>> > nice imo. HBP_NUM = 4 and you need to setup 3 bp's to trace them all.
>>
>> Irrespective of the whole syscall tracing iss
Dear Jan,
> x86 debug registers are already very scarce. Besides that userland
> applications know they have 4 of them available so it would also break
> them.
If a userland application wants to cheat, then it has no need to bypass
the debug registers: even if there were 4096 of them, covering t
Dear Oleg,
> Yes, I understand, so DR_RW_EXECUTE should probably work. And I even
> sent the patch (untested/uncompiled). But given that even the simple
> bugfix which started this thread was ignored by maintainers, I am
> not sure how we can convince them this change makes sense ;)
Just to confi
Hi Oleg,
> However. Of course it would be nice to avoid the new option. IMO it
> would be better to do nothing ;) vsyscall is deprecated, and EMULATE
> is x86-specific.
The problem is that the current static glibc invokes the vsyscall page,
so statically-linked 3rd-party executables that were dis
Hi Oleg,
> Or. Perhaps we can define TRAP_VSYSCALL and change emulate_vsyscall() to
> do
>
>
> if (current->ptrace && test_thread_flag(TIF_SYSCALL_TRACE))
> send_sigtrap(TRAP_VSYSCALL, ...);
>
> if it returns true?
>
I wish it were possible, but the vsyscall page is entered in
Dear Steve,
> But here, there's no prejudice between tasks. All tasks will now hit the
> breakpoint regardless of if it is being traced or not.
Just to clarify, there is no intention to allow conventional breakpoints
in the vsyscall page - that would indeed be a disaster affecting all other
proce
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