mode. This addresses a well-known race condition that can cause
servers to hang in accept(). The relevant case is when somebody
connects to the server and then immediately kills the connection
by sending a TCP reset. On the server this causes select to report
a ready condition on the socket, after which the accept call blocks
because there is no longer any pending connection to accept.
In -current there is already a work-around for this in the kernel.
It was merged into -stable some time ago, but then David Greenman
reverted it because it seemed to be causing a socket leak in some
cases. (See uipc_socket.c revision 1.51.2.3.) Hence this userland
fix is needed in -stable, and I plan to merge it into that branch
soon because it fixes a potential DoS attack. It may also be needed
in -current if the suspected socket leak turns out to be real. In
any case, after thinking it over I believe the fix belongs in
userland. An application shouldn't assume that a ready return from
select guarantees that the subsequent I/O operation cannot block.
A lot can happen between the select and the accept.
A similar fix should most likely be applied to the Unix domain
socket transport too.
Submitted by: peter
Reviewed by: jdp
o Rewrite probe code to work in the newbus world.
o Add preliminary pnp support. I have no clue what the pnp ids for
the older ISA machines/cards. I don't have any of these cards/machines
so I'll have to rely on the user community to give me help.
o Minor code reformatting.
Attach hasn't been touched, and there may be some config issues that
we need to deal with as well. These will follow in time.
daemons started. Move log_in_vain option there. It is needed to avoid
lot of connections to port 80 logged on production WWW server prior
Apache started from /usr/local/etc/rc.d
Cleaning up the code:
- Declare many functions static
- Change variable names to make them more self explanatory
- Change usbd_request_handle -> usbd_xfer_handle
- Syntactical changes
- Remove some unused code
- Other KNF changes
Interrupt context handling
- Change delay to usbd_delay_ms were possible (takes polling mode into
account)
- Change detection mechanism for interrupt context
Add support for pre-allocation DMA-able memory by device driver
Add preliminary support for isochronous to the UHCI driver (not for OHCI
yet).
usb.c, uhci.c, ohci.c
- Initial attempt at detachable USB host controllers
- Handle the use_polling flag with a lttle more care and only set it if
we are cold booting.
usb.c, uhci.c ohci.c, usbdi.c usbdi_util.c usb_subr.c
- Make sure an aborted pipe is marked as not running.
- Start queued request in the right order.
- Insert some more DIAGNOSTIC sanity checks.
- Remove (almost) unused definitions USBD_XFER_OUT and USBD_XFER_IN.
usb.c, usb_subr.c
- Add an event mechanism so that a userland process can watch devices
come and go.
ohci.c
- Handle the case when a USB transfer is so long that it crosses two
page (4K) boundaries. OHCI cannot do that with a single TD so we make
a chain.
ulpt.c
- Use a bigger buffer when transferring data.
- Pre-allocate the DMA buffer. This makes the driver slightly more
efficient.
- Comment out the GET_DEVICE_ID code, because for some unknown reason it
causes printing to fail sometimes.
usb.h
- Add a macro to extract the isoc type.
- Add a macro to check whether the routine has been entered after splusb
and if not, complain.
usbdi.c
- Fix a glitch in dequeueing and aborting requests on interrupt pipes.
- Add a flag in the request to determine if the data copying is done by
the driver or the usbdi layer.
New features are:
Automatic lookup using *.whois-servers.net
Recursive lookup using Registrar's name
Fallback to InterNIC for non-domains
-m for RADB database
-Q to turn recursion/fallback off
Obtained from: OpenBSD
Turn off setgid-kmem for /bin/ps, it's now quite functional without it.
ps no longer needs /dev/*mem or /proc. (It will still use some /proc
files if they are available for -e, but it's not required, so it'll
happily run in a jail or chroot).
The proc stats are now part of eproc (obtained via sysctl) and no longer
needs to beat up the u-page reading code and the problems with that.
This also has the side effect of disabling 'ps -e' for normal users
*EXCEPT* when looking at their own processes. ie: they can see
environments in processes with their uid, enforced by the ownership of
/proc/*/mem. Root can still see them all, as it can open all /proc/*/mem.
pod files to be converted to and installed as manual pages.
These were probably overlooked in the last minor version number upgrade
to perl5. This change was approved by the perl5 maintainer.
PR: 14649
Submitted by: Andy Farkas <andyf@speednet.com.au>
__FreeBSD_version < 400004.
This allows -STABLE to build -CURRENT sources.
[mkstemps() was added to -current just before the version bump to 400004
(a matter of hours in this case), so the test is as exact as possible.]
Submitted by: marcel
accept(2). This is a not really problem on -current as the accept race
is fixed, however it is a MFC candidate for -stable.
This could possibly be slightly more efficient and leave the listening
socket permanently in non-blocking mode, but I wasn't certain that I
could catch all the stream/wait (not nowait) mode implications.
seconds caused overflow. Use a type-safe but slightly slower comparison.
Comparisons for other fields are still fragile.
Fixed rounding of cputime (don't do extra work to get it slightly wrong
by first converting without rounding to milliseconds).
Removed dead code for setting cputime.
Fixed comments about cputime.
It used to loop back up to the accept() call and block there,
shutting out all other transports until a new connection came in.
Now it returns instead after dropping the connection. That will
take it back to the select() loop where all transports can be
serviced. I intend to MFC this within a day or two since it
fixes a DoS vulnerability.
