Date: Wed, 3 Jun 2020 20:30:28 +0300 From: Ilya Matveychikov <matvejchikov@...il.com> To: lkrg-users@...ts.openwall.com Subject: Re: Support for 5.7 linux kernel? > On Jun 3, 2020, at 7:06 PM, Adam Zabrocki <pi3@....com.pl> wrote: > > Hi Ilya, > > On Wed, Jun 03, 2020 at 12:49:12PM +0300, Ilya Matveychikov wrote: >> Hey Adam, >> >> I see 2 ways of getting kallsyms_lookup_name() address: >> - parsing /proc/kallsyms from the kernel using filp_open() >> - parsing /proc/kallsyms before loading LKRG and passing >> address of this symbol as module parameter >> > > Yes, these are possible options. > >> Any other options? >> > > In fact yes. I'm more thinking about the trick with kprobes. We are already > depended on it so it won't introduce any new one. In short, kprobes internally > do have/has access to kallsyms* API. We can try to put a kprobe on > kallsyms_lookup_name() function, extract the address where it was placed and > then remove it. > Yeah, I followed the link you mention right after sending the email. It’s a nice trick with kprobes. The funniest thing of all the story with kallsyms_lookup_name() unexport from the kernel is that it doesn’t change anything but only breaks some useful out-of-tree projects. > Thanks, > Adam > >>> On Jun 3, 2020, at 7:48 AM, Adam Zabrocki <pi3@....com.pl> wrote: >>> >>> Hi Mikhail, >>> >>> On Tue, Jun 02, 2020 at 10:17:44AM +0200, Mikhail Morfikov wrote: >>>> It looks like the lkrg module doesn't build for 5.7 linux kernel. >>>> Are there any plans to support the new stable mainline kernel in the near future? >>> >>> Thanks for reporting this problem. I've verified that and it looks like the >>> kernel maintainers unexported some symbols which LKRG uses: >>> >>> https://lkml.org/lkml/2020/5/5/478 >>> >>> We need to think about the proper solution for that. We might go with the same >>> path as LTTs maintaners. >>> >>> Thanks, >>> Adam >>> >>> -- >>> pi3 (pi3ki31ny) - pi3 (at) itsec pl >>> http://pi3.com.pl >>> >> > > -- > pi3 (pi3ki31ny) - pi3 (at) itsec pl > http://pi3.com.pl
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