Messages in this thread |  | | From | Namhyung Kim <> | Subject | Re: [PATCHSET 00/13] tracing/uprobes: Add support for more fetch methods (v6) | Date | Tue, 05 Nov 2013 10:59:02 +0900 |
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On Mon, 4 Nov 2013 16:51:31 +0100, Oleg Nesterov wrote: > 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.
Hmm.. right. We should deal with relative addresses from the base mapping address of a binary.
> > But in any case, I strongly believe that it doesn't make any sense to > rely on tu->inode in get_user_vaddr().
I'll think about it more.
Thanks, Namhyung
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