Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetchmethods (v6)

From: Oleg Nesterov
Date: Mon Nov 04 2013 - 10:53:05 EST

On 11/04, Namhyung Kim wrote:
> On Mon, 04 Nov 2013 17:46:41 +0900, Namhyung Kim wrote:
> > On Sat, 2 Nov 2013 16:54:58 +0100, Oleg Nesterov wrote:
> >> - this only allows to read the data from the same binary.
> >
> > Right. This is also an unnecessary restriction. We should be able to
> > access data in other binary.
> Hmm.. I guess this gonna be not simple

Yes ;)

- perhaps it can only be
> supported for per-process uprobe with known virtual addresses?

"Known" is very limited. Even in the simplest case (like your test-case
from from 0/13), you simply can't know the address of "int glob" if you
compile it with "-pie -fPIC".

As for other binaries (say libc) the problem is even worse, and
randomize_va_space adds even more pain.

But in any case, I strongly believe that it doesn't make any sense to
rely on tu->inode in get_user_vaddr().


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