linux-kernel - RE: modpost Module.symver handling is broken in 5.6.0-rc7

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 26 Mar 2020 17:06:25 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Jessica Yu' <jeyu@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "'Linus Torvalds'" <torvalds@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Matthias Maennich <maennich@...gle.com>
Subject: RE: modpost Module.symver handling is broken in 5.6.0-rc7

From: Jessica Yu
> Sent: 26 March 2020 16:51
> +++ David Laight [26/03/20 16:25 +0000]:
> >Something is currently broken in modpost.
> >I'm guessing it is down to the recent patch that moved the
> >namespace back to the end of the line.
> >
> >I'm building 2 'out of tree' modules that have a symbol dependency.
> >When I build the 2nd module I get ERROR "symbol" undefined message.
> >
> >If I flip the order of the fields in Module.symver to the older order
> >and link with modpost from 5.4.0-rc7 (which I happen to have lurking)
> >it all works fine.
> >
> >Note that I'm using a named namespace, not the default one
> >that is the full path of the module.
> >
> >I'll dig in a little further.
> 
> [ Adding more people to CC ]
> 
> Hi David,
> 
> Could you provide some more details about how I can reproduce the
> issue? As I understand it, you have two out-of-tree modules, and one
> has a symbol dependency on the second? Pasting the modpost error
> messages helps too.

Ok, I've found out what broke it.
Was actually the removal of the code that parsed Module.symvers
from the current directory (which happened for 5.5.0-rc0).

Took some digging and printfs in modpost to find what wasn't happening.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)