n of powerof2(x) && !powerof2(2*x)
for x = 1 << (n - 1); this seems far more astonishing than
the well-understood fact that machine arithmetic operates
with a modular ring, so it seems to me that your proposed
patch would do more harm than good.
--
Colin Percival
Security Officer, FreeBSD
ernel which came with 6.3-RELEASE-p4 but you
haven't rebooted yet.
Colin Percival
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Subhash Gopinath wrote:
> Does anyone know if FreeBSD 4.x or 5.x is affected by the Ipv6 mbuf
> vulnerability just like OpenBSD?
>
> http://www.coresecurity.com/index.php5?module=ContentMod&action=item&id=1703
The project ipv6 experts have convinced me that FreeBSD is
t/kernel,
the kernel will be replaced with a GENERIC (non-SMP) kernel.
I'm working on a patch for this and will be talking to re@ about having an
Errata Notice sent out about this.
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http://l
ot to create the jail in the
> first place.
Not necessarily. An unprivileged user can create hard links to binaries
he doesn't own, including suid binaries.
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s he wants, and then run them from outside of the jail to
obtain root privileges in the host machine.
The fact that you're calling jail_attach(2) instead of jail(2) makes me
slightly less worried, but you'd still have to work very hard to convince
me that this should become part of t
there were
several people in this position, so I'm hoping I can reach my target in
the next week.
As before, details about the work I plan on doing, how to donate, and a list
of the donations I have received, are at
http://people.freebsd.org/~cperciva/funding.html
Colin Per
you need, rather than making an existing and possibly insecure
program setuid.
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rica. When I asked about this I got the impression
that such payment mechanisms were only available to business customers
(i.e., those paying large fees for the privilege).
Colin Percival
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s), please contact me by email to obtain my
mailing address. In either case, please let me know if you wish to
remain anonymous.
For more details, see http://people.freebsd.org/~cperciva/funding.html .
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you don't use proper fencing instructions.
But I may be completely confused here -- all the interesting details are in
NDA'ed manuals which I can't get access to. :-(
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Yes, that's quite correct -- although I can't imagine how a bug which
caused / to be labelled as "noexec" managed to avoid causing major
problems until now.
I don't know anything about NFS, but hopefully someone on -stable
will be able to work out what's going on from
don't seem to hurt anything, but it would be nice to get this fixed.
The problem is in src/rescue/Makefile. I'll fix it.
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To
you generate
2^n hashes randomly without finding a collision, then the hash must
have at least ~~ 2n bits of entropy, and organized attempts to crack
MD5 generated at least 2^50 hashes before the algorithmic break was
found.)
Colin Percival
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nd in some cases re@).
I will make no apology for either of these, and I doubt anyone else (either
from the security team, or the security officer himself) will do so either.
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FreeBSD-SA-04:17.procfs security advisory.
Could you send the rest of these to [EMAIL PROTECTED] We'd like to
look at them and fix any security issues before they are publicly disclosed.
Thanks,
Colin Percival
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runtime library ?
Thus quoth the gnu/lib/libobjc Makefile:
NOPIC= works but method lookup slowdown is significant
If you want a shared library, remove that line.
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es it possible to remove some subsystems:
http://docs.freebsd.org/cgi/mid.cgi?6.0.1.1.1.20040316023919.039fa5f0
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larly, FreeBSD 5.x binaries are identified as FreeBSD 5.0.x.
Simply put, the format of __FreeBSD_version changed, and file(1) hasn't
been fixed.
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rom
0x10018. My personal suspicion is that this is probably a hardware fault; I'd let
the machine run some more and see if it panics again in the same place or
somewhere different next time. :-)
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At 06:11 10/04/2004, Brandon Erhart wrote:
>Are there any debuggers out there for BSD that will detect the heap/stack corruption!?
Real Men use printf(3). :-)
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lta; buildworld takes about 5% longer on an SMP kernel (and
the time spent in the kernel is 20% longer).
I know some optimizations were done shortly after 5.2, so I
wouldn't be surprised if this situation has improved.
Colin Percival
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ot; says I, "you have 30,000 data
sets!" Quoth the love of my life, "That's OK, we've got *two*
computers."
... and 8 years to waste, apparently.
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nd drive, which
boots into a memory disk; you can then slice, partition,
create filesystems, and generally do whatever you like with
the system -- without needing anything beyond a network
connection.
Colin Percival
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g as the necessary changes are obvious, I don't
see that there is any real problem.
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worth, I've now got 15 commits waiting for
mentor approval, covering everything here apart from a few
of the "redundant code" bugs where I'm not sure what the
intended action is, and a couple bugs which I've dispatched
to the app
I've either got patches or sent
emails to the appropriate maintainers.
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atches for three others (sent to my mentor for approval before I commit)
and I've pointed sos@ at the ATA bug.
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in src/sys/i386/include/pmap.h.
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ops).
Of course, some processors now have hints (conditional-jump-
which-is-usually-taken, conditional-jump-which-is-usually-not-
taken, etc.)
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To u
en't
gotten around to yet).
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erbox/www/valid-css.png
tools/tools/tinderbox/www/valid-xhtml10.png
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ng in the
right direction, and committers are doing a great job. But I
think the contributions of non-committers could make FreeBSD
even better, and those contributions are being largely lost or
ignored.
Colin Percival
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At 11:22 27/12/2003 -0700, M. Warner Losh wrote:
Yes. It is our friend the troll stirring up trouble again. Bad
Troll. No biscuit.
No, you misunderstand. The troll is resigning from FreeBSD. He's
going to stop trolling our lists and find something else to do. :)
Colin Per
t the system can boot Linux, one option is to install linux,
build a minimal FreeBSD filesystem, dd it to the drive, and reboot. If
you want to be clever, you could even create a filesystem in a md root,
and then run sysinstall over ssh.
Colin Percival
__
ble to put the above into /boot/loader.rc.
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d-update install`. Given a
decent internet connection, this takes no more than a couple minutes, and
is much easier than updating your install image every time security issues
arise.
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self, you'll break FreeBSD
Update. (If you absolutely must build your own versions of the binaries,
please contact me off-list.)
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f you're doing this,
but the code is all online and (reasonably) straightforward.
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FreeBSD Update + portupgrade.
This wasn't an option for the original poster (imp@) because he wanted
to track -stable.
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reason for this behaviour?
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ult, I can certainly work around it;
but since I have almost no knowledge of kernel internals I thought I'd ask.
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you've got a small enough amount of traffic, you could use tcpdump to
snarf the headers and then use your favourite scripting languge to look for
repeated sequence numbers (retransmits) and repeated acks (lost packets);
but I suspect this would be too slow for most purposes.
Colin Per
erver? It
looks like GNATS email is rather aggressively filtered against server
blacklists; I have to route all my PRs through an SSH tunnel to a different
system in order to get them accepted.
Colin Percival
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ant future, when FreeBSD is fully
packagized, it's quite likely that Sendmail will be just one of many
installable options; but that time hasn't come yet.
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he resulting package. MD5 hashes are
dac0f4bdf3d23b642bcbbac0e544821e, 12f69c9d0a2bf1f5278e49f0a4821aa7,
b96bfc6bffcbfa18130250e36e6109d6, and 227819b9403a6f727566bd6ad5a79684 for
server, client, client port, and client package respectively.
Feedback is welcome. ;)
Colin Percival
PS. This is
;stamp of approval"; both for my own peace of mind and to make
people feel more happy about using it.
Colin Percival
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tch which simply uses the
full path of the file.
Applying his patch (with some minor changes to make it fit 2.95.4), I've
now got libobjc consistently building to the same file (apart from the
easily handled library index).
Colin Percival
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troversial FreeBSD people for quite a
long time now.
Colin Percival
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.
Incidentally, the sizes of those files don't vary.
Can anyone help me understand what is going on here?
Colin Percival
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At 11:58 10/08/2002 -0700, Terry Lambert wrote:
>Colin Percival wrote:
> > Files which are always the same size, but seem to have completely different
> > contents:
> > /usr/share/games/fortune/*.dat
> > /var/games/phantasia/void
>
>This is disturbing.
Upon fu
At 00:41 08/08/2002 -0700, Terry Lambert wrote:
>Colin Percival wrote:
> >If two people `make release` on different machines, how much difference
> > will there be between the results? Obviously the kernel will be different
> > because it contains the user and host
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ht up over and over again,
but I really haven't seen anything which I'd call *nasty*.
Can't we all be a bit more tolerant and get along with each other?
Colin Percival
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es if
I knew that it would be unable to make any system calls beyond those
necessary to interface with the owning application.
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