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Bug 88766 - Kernel won't build on Sparc w/hardened-sources-2.6.11-r1
Summary: Kernel won't build on Sparc w/hardened-sources-2.6.11-r1
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: [OLD] Unspecified (show other bugs)
Hardware: Sparc Linux
: High normal (vote)
Assignee: Sparc Porters
Depends on:
Reported: 2005-04-11 13:50 UTC by Alec Warner
Modified: 2005-04-15 07:28 UTC (History)
0 users

See Also:
Package list:
Runtime testing required: ---

Kernel config file (config,26.12 KB, application/octet-stream)
2005-04-11 13:53 UTC, Alec Warner

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Description Alec Warner archtester Gentoo Infrastructure gentoo-dev Security 2005-04-11 13:50:52 UTC
A.  I am aware hardened on sparc is not supported.  Since it's not I decided to look at the sources instead of giving up.  The problem is it appears that this is not hardened related.

livecd linux # make
  CHK     include/linux/version.h
  CC      init/main.o
In file included from include/linux/module.h:10,
                 from init/main.c:16:
include/linux/sched.h: In function `lock_need_resched':
include/linux/sched.h:1186: error: request for member `break_lock' in something not a structure or union
make[1]: *** [init/main.o] Error 1
make: *** [init] Error 2

So I go looking at sched.h

 * Does a critical section need to be broken due to another
 * task waiting?:
#if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
# define need_lockbreak(lock) ((lock)->break_lock)
# define need_lockbreak(lock) 0

 * Does a critical section need to be broken due to another
 * task waiting or preemption being signalled:
static inline int lock_need_resched(spinlock_t *lock)
        if (need_lockbreak(lock) || need_resched())
                return 1;
        return 0;

Ok macro for spinlock_t, tries to access break_lock.  Thats fine, lets go find spinlock_t and see if it has one.

in /usr/src/linux/include/linux/spinlock.h
 * If CONFIG_SMP is set, pull in the _raw_* definitions

#define assert_spin_locked(x)   BUG_ON(!spin_is_locked(x))
#include <asm/spinlock.h>

Thats me, so check asm/spinlock.h

in /usr/src/linux/include/asm/spinlock.h 

typedef unsigned char spinlock_t;

It's a char, and I am unaware of how a char can have break_lock member in C.

livecd linux # cat .config | grep CONFIG_DEBUG_SPINLOCK
livecd linux # cat .config | grep SMP

Rest of my config is attached.
Comment 1 Alec Warner archtester Gentoo Infrastructure gentoo-dev Security 2005-04-11 13:53:29 UTC
Created attachment 56028 [details]
Kernel config file

Hopefully this helps
Comment 2 Gustavo Zacarias (RETIRED) gentoo-dev 2005-04-11 14:23:58 UTC
Don't wanna be rude, but unless the hardened team picks this up i doubt anyone on the sparc team will.
For starters hardened-sources doesn't include the sparc patchset that makes 2.6 somewhat usable (like in works kinda OK for a UP server, mostly b0rked for SMP).
Last chance would be some 2.4 kernel if they want to support it, or use sparc-sources (2.4-based) since this one includes grsec (but not selinux).
Hardened team: ?
Comment 3 solar (RETIRED) gentoo-dev 2005-04-11 14:59:51 UTC
Gustavo Zacarias is correct. Hardened + Sparc are not really supported at this 
time. sparc-sources-2.4.x taking advantage of grsec is probably your best bet for 
now. It also might be helpful to make sure the grsec revisions are kept fairly 
upto date in it.

Alec in the future it would be helpful if you also gave the output of 
'emerge info' along with the exact version of what your reporting a bug for.

Comment 4 Alec Warner archtester Gentoo Infrastructure gentoo-dev Security 2005-04-11 16:12:47 UTC
It looks like turning Preempt off will make it build fine.  it's not a problem if you guys don't want to pick it up, I'm fine running w/o preempt.  Filing it upstream would be good though.

For completeness:
livecd / # emerge info
Gentoo Base System version 1.4.16
Portage (selinux/2004.1/sparc64, gcc-3.3.5-20050130, glibc-
420-r2, 2.4.29-sparc-smp sparc64)
System uname: 2.4.29-sparc-smp sparc64 sun4u
Python:              dev-lang/python-2.3.4-r1 [2.3.4 (#1, Apr 11 2005, 06:28:43)
dev-lang/python:     2.3.4-r1
sys-devel/autoconf:  2.13, 2.59-r6
sys-devel/automake:  1.8.5-r3, 1.5, 1.7.9-r1, 1.6.3, 1.4_p6, 1.9.4
sys-devel/libtool:   1.5.10-r4
CFLAGS="-mcpu=v9 -mtune=v9 -O2 -pipe"
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3/share/config /usr/share/
config /var/qmail/control"
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d"
CXXFLAGS="-mcpu=v9 -mtune=v9 -O2 -pipe"
FEATURES="autoaddcvs autoconfig distlocks sandbox selinux sfperms strict userpriv usersandbox"
USE="X aalib apache2 bash-completion berkb berkdb bzlib caps cdparanoia cjk cryp
t dio encode ethereal ffmpeg geoip gif imagemagick imap informix ingres jpeg ker
beros krb4 ldap maildir matroska mp3 mpeg mysql nas ncurses nis nls offensive og
g pam perl php pie png posix postgres python readline ruby samba sasl selinux sh
aredmem soap sparc spell ssl tcpd unicode vhosts vorbis xml2 xmlrpc zlib"
Comment 5 Gustavo Zacarias (RETIRED) gentoo-dev 2005-04-11 16:30:12 UTC
That it builds doesn't mean it works.
Sure, you can build 2.6 on sparc, it just won't work right for every piece of common hardware out there (specially SMP boxes).
sparc-sources has grsec builtin, Joker keeps it in sync with upstream and clean from nasty security bugs - you can use that for hardened, just not selinux - this is our currently supported and stable kernel.
Anything in the 2.6 area is experimental at the moment, mostly because upstream (vanilla) kernels just don't cut it for sparc. You need to apply heavy patches to get it somewhat working on some hardware (currently being applied by Eradicator on gentoo-sources), and this patches won't go into hardened-sources any time soon, hardened-sources isn't a playground.
So as solar says, this will have to get solved upstream first, that is, make 2.6 kernels a real working thing(tm) on sparc first.
Comment 6 Alec Warner archtester Gentoo Infrastructure gentoo-dev Security 2005-04-11 19:15:24 UTC
As a note, why is there an SElinux on sparc guide if there is no kernel available on Sparc?  obviously it had to work at some time for a guide to be written?
Comment 7 Gustavo Zacarias (RETIRED) gentoo-dev 2005-04-15 07:28:07 UTC
The hardened team should answer about that.
At some point they had something working, but it was never finished or released.