Text relocations in kernel modules
kostikbel at gmail.com
Fri Mar 30 19:07:30 UTC 2012
On Fri, Mar 30, 2012 at 01:38:14PM -0400, Richard Yao wrote:
> As a disclaimer, I would like to clarify that Gentoo/FreeBSD uses a
> FreeBSD userland and that Gentoo/FreeBSD has nothing to do with Debian
> GNU/kFreeBSD. People seem to think Gentoo/FreeBSD is related to Debian
> GNU/kFreeBSD, which has made collaboration difficult.
> With that said, Gentoo Portage is warning about text relocations in
> kernel modules. This is in a Gentoo/FreeBSD port of
> emulators/freebsd-kmod that I wrote. For instance, I see:
> # readelf -d /boot/modules/virtio.ko
> Dynamic section at offset 0x2f6c contains 13 entries:
> Tag Type Name/Value
> 0x00000004 (HASH) 0xd4
> 0x6ffffef5 (GNU_HASH) 0x238
> 0x00000005 (STRTAB) 0x4a8
> 0x00000006 (SYMTAB) 0x298
> 0x0000000a (STRSZ) 397 (bytes)
> 0x0000000b (SYMENT) 16 (bytes)
> 0x00000011 (REL) 0x638
> 0x00000012 (RELSZ) 1568 (bytes)
> 0x00000013 (RELENT) 8 (bytes)
> 0x00000016 (TEXTREL) 0x0
> 0x0000001e (FLAGS) TEXTREL
> 0x6ffffffa (RELCOUNT) 108
> 0x00000000 (NULL) 0x0
> Checking /boot/kernel, it seems that all modules have text relocations.
> My Gentoo/FreeBSD install is a 32-bit chroot on a ZFS Guru install of
> amd64 FreeBSD. amd64 FreeBSD does not appear to have any text relocations.
> I don't have a reference i386 install, but according to frogs in
> ##freebsd on freenode, his i386 FreeBSD also has text relocations.
> Is this a bug?
No. This is by design.
Why do you consider this a bug ?
> Yours truly,
> Richard Yao
> On 03/30/12 12:49, Richard Yao wrote:
> > Dear Ports Maintainers and kuriyama,
> > emulators/freebsd-kmod has a typo in pkg-descr, where it says "lodable"
> > instead of "loadable".
> > In addition, I have done the work necessary to port
> > emulators/freebsd-kmod to Gentoo/FreeBSD.
> > https://bugs.gentoo.org/show_bug.cgi?id=410199
> > The ebuild contains a few improvements on the original FreeBSD port
> > where we copy only the parts of SYSDIR that we need to build the module.
> > We also do hardlinks instead of copies when Gentoo Portage builds with
> > user privileges.
> > The NEEDSUBDIRS part of the ebuild was written by naota AT gentoo.org as
> > part of Gentoo's review process. I have permission from him to upstream
> > the improvements we made on the port. Feel free to adopt any
> > improvements in the attachments in that bug report.
> > Lastly, I have sent an email to gentoo-dev AT lists.gentoo.org and
> > gentoo-bsd AT lists.gentoo.org requesting that the FreeBSD specific
> > parts of the portage tree be relicensed under terms of the BSD-2
> > license. With a little luck, it will be possible to upstream
> > improvements made in Gentoo/FreeBSD without any hassle in the future.
> > Yours truly,
> > Richard Yao
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