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linux/Documentation/feature-removal-schedule.txt
Thomas Gleixner 7d99b7d634 [PATCH] Validate and sanitze itimer timeval from userspace 
According to the specification the timevals must be validated and an
errorcode -EINVAL returned in case the timevals are not in canonical form.
This check was never done in Linux.

The pre 2.6.16 code converted invalid timevals silently.  Negative timeouts
were converted by the timeval_to_jiffies conversion to the maximum timeout.

hrtimers and the ktime_t operations expect timevals in canonical form.
Otherwise random results might happen on 32 bits machines due to the
optimized ktime_add/sub operations.  Negative timeouts are treated as
already expired.  This might break applications which work on pre 2.6.16.

To prevent random behaviour and API breakage the timevals are checked and
invalid timevals sanitized in a simliar way as the pre 2.6.16 code did.

Invalid timevals are reported with a per boot limited number of kernel
messages so applications which use this misfeature can be corrected.

After a grace period of one year the sanitizing should be replaced by a
correct validation check.  This is also documented in
Documentation/feature-removal-schedule.txt

The validation and sanitizing is done inside do_setitimer so all callers
(sys_setitimer, compat_sys_setitimer, osf_setitimer) are catched.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-25 08:22:49 -08:00

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The following is a list of files and features that are going to be
removed in the kernel source tree. Every entry should contain what
exactly is going away, why it is happening, and who is going to be doing
the work. When the feature is removed from the kernel, it should also
be removed from this file.
---------------------------
What: devfs
When: July 2005
Files: fs/devfs/*, include/linux/devfs_fs*.h and assorted devfs
function calls throughout the kernel tree
Why: It has been unmaintained for a number of years, has unfixable
races, contains a naming policy within the kernel that is
against the LSB, and can be replaced by using udev.
Who: Greg Kroah-Hartman <greg@kroah.com>
---------------------------
What: RAW driver (CONFIG_RAW_DRIVER)
When: December 2005
Why: declared obsolete since kernel 2.6.3
O_DIRECT can be used instead
Who: Adrian Bunk <bunk@stusta.de>
---------------------------
What: drivers depending on OBSOLETE_OSS_DRIVER
When: January 2006
Why: OSS drivers with ALSA replacements
Who: Adrian Bunk <bunk@stusta.de>
---------------------------
What: RCU API moves to EXPORT_SYMBOL_GPL
When: April 2006
Files: include/linux/rcupdate.h, kernel/rcupdate.c
Why: Outside of Linux, the only implementations of anything even
vaguely resembling RCU that I am aware of are in DYNIX/ptx,
VM/XA, Tornado, and K42. I do not expect anyone to port binary
drivers or kernel modules from any of these, since the first two
are owned by IBM and the last two are open-source research OSes.
So these will move to GPL after a grace period to allow
people, who might be using implementations that I am not aware
of, to adjust to this upcoming change.
Who: Paul E. McKenney <paulmck@us.ibm.com>
---------------------------
What: raw1394: requests of type RAW1394_REQ_ISO_SEND, RAW1394_REQ_ISO_LISTEN
When: November 2005
Why: Deprecated in favour of the new ioctl-based rawiso interface, which is
more efficient. You should really be using libraw1394 for raw1394
access anyway.
Who: Jody McIntyre <scjody@steamballoon.com>
---------------------------
What: Video4Linux API 1 ioctls and video_decoder.h from Video devices.
When: July 2006
Why: V4L1 AP1 was replaced by V4L2 API. during migration from 2.4 to 2.6
series. The old API have lots of drawbacks and don't provide enough
means to work with all video and audio standards. The newer API is
already available on the main drivers and should be used instead.
Newer drivers should use v4l_compat_translate_ioctl function to handle
old calls, replacing to newer ones.
Decoder iocts are using internally to allow video drivers to
communicate with video decoders. This should also be improved to allow
V4L2 calls being translated into compatible internal ioctls.
Who: Mauro Carvalho Chehab <mchehab@brturbo.com.br>
---------------------------
What: remove EXPORT_SYMBOL(panic_timeout)
When: April 2006
Files: kernel/panic.c
Why: No modular usage in the kernel.
Who: Adrian Bunk <bunk@stusta.de>
---------------------------
What: remove EXPORT_SYMBOL(insert_resource)
When: April 2006
Files: kernel/resource.c
Why: No modular usage in the kernel.
Who: Adrian Bunk <bunk@stusta.de>
---------------------------
What: PCMCIA control ioctl (needed for pcmcia-cs [cardmgr, cardctl])
When: November 2005
Files: drivers/pcmcia/: pcmcia_ioctl.c
Why: With the 16-bit PCMCIA subsystem now behaving (almost) like a
normal hotpluggable bus, and with it using the default kernel
infrastructure (hotplug, driver core, sysfs) keeping the PCMCIA
control ioctl needed by cardmgr and cardctl from pcmcia-cs is
unnecessary, and makes further cleanups and integration of the
PCMCIA subsystem into the Linux kernel device driver model more
difficult. The features provided by cardmgr and cardctl are either
handled by the kernel itself now or are available in the new
pcmciautils package available at
http://kernel.org/pub/linux/utils/kernel/pcmcia/
Who: Dominik Brodowski <linux@brodo.de>
---------------------------
What: ip_queue and ip6_queue (old ipv4-only and ipv6-only netfilter queue)
When: December 2005
Why: This interface has been obsoleted by the new layer3-independent
"nfnetlink_queue". The Kernel interface is compatible, so the old
ip[6]tables "QUEUE" targets still work and will transparently handle
all packets into nfnetlink queue number 0. Userspace users will have
to link against API-compatible library on top of libnfnetlink_queue
instead of the current 'libipq'.
Who: Harald Welte <laforge@netfilter.org>
---------------------------
What: remove EXPORT_SYMBOL(kernel_thread)
When: August 2006
Files: arch/*/kernel/*_ksyms.c
Why: kernel_thread is a low-level implementation detail. Drivers should
use the <linux/kthread.h> API instead which shields them from
implementation details and provides a higherlevel interface that
prevents bugs and code duplication
Who: Christoph Hellwig <hch@lst.de>
---------------------------
What: EXPORT_SYMBOL(lookup_hash)
When: January 2006
Why: Too low-level interface. Use lookup_one_len or lookup_create instead.
Who: Christoph Hellwig <hch@lst.de>
---------------------------
What: CONFIG_FORCED_INLINING
When: June 2006
Why: Config option is there to see if gcc is good enough. (in january
2006). If it is, the behavior should just be the default. If it's not,
the option should just go away entirely.
Who: Arjan van de Ven
---------------------------
What: START_ARRAY ioctl for md
When: July 2006
Files: drivers/md/md.c
Why: Not reliable by design - can fail when most needed.
Alternatives exist
Who: NeilBrown <neilb@suse.de>
---------------------------
What: au1x00_uart driver
When: January 2006
Why: The 8250 serial driver now has the ability to deal with the differences
between the standard 8250 family of UARTs and their slightly strange
brother on Alchemy SOCs. The loss of features is not considered an
issue.
Who: Ralf Baechle <ralf@linux-mips.org>
---------------------------
What: eepro100 network driver
When: January 2007
Why: replaced by the e100 driver
Who: Adrian Bunk <bunk@stusta.de>
---------------------------
What: pci_module_init(driver)
When: January 2007
Why: Is replaced by pci_register_driver(pci_driver).
Who: Richard Knutsson <ricknu-0@student.ltu.se> and Greg Kroah-Hartman <gregkh@suse.de>
---------------------------
What: Usage of invalid timevals in setitimer
When: March 2007
Why: POSIX requires to validate timevals in the setitimer call. This
was never done by Linux. The invalid (e.g. negative timevals) were
silently converted to more or less random timeouts and intervals.
Until the removal a per boot limited number of warnings is printed
and the timevals are sanitized.
Who: Thomas Gleixner <tglx@linutronix.de>
---------------------------
What: I2C interface of the it87 driver
When: January 2007
Why: The ISA interface is faster and should be always available. The I2C
probing is also known to cause trouble in at least one case (see
bug #5889.)
Who: Jean Delvare <khali@linux-fr.org>
---------------------------
What: remove EXPORT_SYMBOL(tasklist_lock)
When: August 2006
Files: kernel/fork.c
Why: tasklist_lock protects the kernel internal task list. Modules have
no business looking at it, and all instances in drivers have been due
to use of too-lowlevel APIs. Having this symbol exported prevents
moving to more scalable locking schemes for the task list.
Who: Christoph Hellwig <hch@lst.de>
---------------------------
What: mount/umount uevents
When: February 2007
Why: These events are not correct, and do not properly let userspace know
when a file system has been mounted or unmounted. Userspace should
poll the /proc/mounts file instead to detect this properly.
Who: Greg Kroah-Hartman <gregkh@suse.de>
---------------------------
What: Support for NEC DDB5074 and DDB5476 evaluation boards.
When: June 2006
Why: Board specific code doesn't build anymore since ~2.6.0 and no
users have complained indicating there is no more need for these
boards. This should really be considered a last call.
Who: Ralf Baechle <ralf@linux-mips.org>
---------------------------
What: USB driver API moves to EXPORT_SYMBOL_GPL
When: Febuary 2008
Files: include/linux/usb.h, drivers/usb/core/driver.c
Why: The USB subsystem has changed a lot over time, and it has been
possible to create userspace USB drivers using usbfs/libusb/gadgetfs
that operate as fast as the USB bus allows. Because of this, the USB
subsystem will not be allowing closed source kernel drivers to
register with it, after this grace period is over. If anyone needs
any help in converting their closed source drivers over to use the
userspace filesystems, please contact the
linux-usb-devel@lists.sourceforge.net mailing list, and the developers
there will be glad to help you out.
Who: Greg Kroah-Hartman <gregkh@suse.de>
---------------------------
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