Messages in this thread |  | | Date | Mon, 4 Nov 2013 16:51:31 +0100 | From | Oleg Nesterov <> | Subject | Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetch methods (v6) |
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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().
Oleg.
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