linux-stable.git/include/linux, branch linux-2.6.24.y

file capabilities: remove cap_task_kill()

2008-04-19T01:53:30+00:00

upstream commit: aedb60a67c10a0861af179725d060765262ba0fb

The original justification for cap_task_kill() was as follows:

	check_kill_permission() does appropriate uid equivalence checks.
	However with file capabilities it becomes possible for an
	unprivileged user to execute a file with file capabilities
	resulting in a more privileged task with the same uid.

However now that cap_task_kill() always returns 0 (permission
granted) when p->uid==current->uid, the whole hook is worthless,
and only likely to create more subtle problems in the corner cases
where it might still be called but return -EPERM.  Those cases
are basically when uids are different but euid/suid is equivalent
as per the check in check_kill_permission().

One example of a still-broken application is 'at' for non-root users.

This patch removes cap_task_kill().

Signed-off-by: Serge Hallyn 
Acked-by: Andrew G. Morgan 
Earlier-version-tested-by: Luiz Fernando N. Capitulino 
Acked-by: Casey Schaufler 
Signed-off-by: Linus Torvalds 
[chrisw@sous-sol.org: backport to 2.6.24.4]
Signed-off-by: Chris Wright

NET: include into linux/ethtool.h for __u* typedef

2008-04-19T01:53:24+00:00

Upstream commit: e621e69137b24fdbbe7ad28214e8d81e614c25b7

Signed-off-by: Kirill A. Shutemov 
Signed-off-by: David S. Miller 
Signed-off-by: Chris Wright

PERCPU : __percpu_alloc_mask() can dynamically size percpu_data storage

2008-04-19T01:53:21+00:00

upstream commit: b3242151906372f30f57feaa43b4cac96a23edb1

Instead of allocating a fix sized array of NR_CPUS pointers for percpu_data,
we can use nr_cpu_ids, which is generally < NR_CPUS.

Signed-off-by: Eric Dumazet 
Cc: Christoph Lameter 
Cc: "David S. Miller" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Chris Wright

NOHZ: reevaluate idle sleep length after add_timer_on()

2008-04-19T01:53:20+00:00

upstream commit: 06d8308c61e54346585b2691c13ee3f90cb6fb2f

add_timer_on() can add a timer on a CPU which is currently in a long
idle sleep, but the timer wheel is not reevaluated by the nohz code on
that CPU. So a timer can be delayed for quite a long time. This
triggered a false positive in the clocksource watchdog code.

To avoid this we need to wake up the idle CPU and enforce the
reevaluation of the timer wheel for the next timer event.

Add a function, which checks a given CPU for idle state, marks the
idle task with NEED_RESCHED and sends a reschedule IPI to notify the
other CPU of the change in the timer wheel.

Call this function from add_timer_on().

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Acked-by: Ingo Molnar 
Signed-off-by: Chris Wright 
--
 include/linux/sched.h |    6 ++++++
 kernel/sched.c        |   43 +++++++++++++++++++++++++++++++++++++++++++
 kernel/timer.c        |   10 +++++++++-
 3 files changed, 58 insertions(+), 1 deletion(-)

USB: new quirk flag to avoid Set-Interface

2008-04-19T01:53:19+00:00

upstream commit: 392e1d9817d0024c96aae237c3c4349e47c976fd

This patch (as1057) fixes a problem with the X-Rite/Gretag-Macbeth
Eye-One Pro display colorimeter; the device crashes when it receives a
Set-Interface request.  A new quirk (USB_QUIRK_NO_SET_INTF) is
introduced and a quirks entry is created for this device.

Signed-off-by: Alan Stern 
Signed-off-by: Greg Kroah-Hartman 
[chrisw@sous-sol.org: backport to 2.6.24.4]
Signed-off-by: Chris Wright

USB: add support for Motorola ROKR Z6 cellphone in mass storage mode

2008-04-19T01:53:19+00:00

upstream commit: cc36bdd47ae51b66780b317c1fa519221f894405

Motorola ROKR Z6 cellphone has bugs in its USB, so it is impossible to use
it as mass storage. Patch describes new "unusual" USB device for it with
FIX_INQUIRY and FIX_CAPACITY flags and new BULK_IGNORE_TAG flag.
Last flag relaxes check for equality of bcs->Tag and us->tag in
usb_stor_Bulk_transport routine.

Signed-off-by: Constantin Baranov 
Signed-off-by: Matthew Dharm 
Signed-off-by: Daniel Drake 
Signed-off-by: Greg Kroah-Hartman 
Signed-off-by: Chris Wright

time: prevent the loop in timespec_add_ns() from being optimised away

2008-04-19T01:53:18+00:00

upstream commit: 38332cb98772f5ea757e6486bed7ed0381cb5f98

Since some architectures don't support __udivdi3().

Signed-off-by: Segher Boessenkool 
Cc: john stultz 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Thomas Gleixner 
Cc:  Sedat Dilek 
Signed-off-by: Chris Wright

moduleparam: fix alpha, ia64 and ppc64 compile failures

2008-03-24T18:47:25+00:00

[upstream commit: 91d35dd9]

On alpha, ia64 and ppc64 only relocations to local data can go into
read-only sections. The vast majority of module parameters use the global
generic param_set_*/param_get_* functions, so the 'const' attribute for
struct kernel_param is not only useless, but it also causes compile
failures due to 'section type conflict' in those rare cases where
param_set/get are local functions.

This fixes http://bugzilla.kernel.org/show_bug.cgi?id=8964

Signed-off-by: Ivan Kokshaysky 
Cc: Richard Henderson 
Cc: Tony Luck 
Cc: Anton Blanchard 
Cc: Paul Mackerras 
Cc: Adrian Bunk 
Cc: Kamalesh Babulal 
Cc: Rusty Russell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Cc: Mike Pagano 
[chrisw@sous-sol.org: backport to 2.6.24.3]
Signed-off-by: Chris Wright 
Signed-off-by: Greg Kroah-Hartman

futex: runtime enable pi and robust functionality

2008-03-24T18:47:18+00:00

commit: a0c1e9073ef7428a14309cba010633a6cd6719ea

Not all architectures implement futex_atomic_cmpxchg_inatomic().  The default
implementation returns -ENOSYS, which is currently not handled inside of the
futex guts.

Futex PI calls and robust list exits with a held futex result in an endless
loop in the futex code on architectures which have no support.

Fixing up every place where futex_atomic_cmpxchg_inatomic() is called would
add a fair amount of extra if/else constructs to the already complex code.  It
is also not possible to disable the robust feature before user space tries to
register robust lists.

Compile time disabling is not a good idea either, as there are already
architectures with runtime detection of futex_atomic_cmpxchg_inatomic support.

Detect the functionality at runtime instead by calling
cmpxchg_futex_value_locked() with a NULL pointer from the futex initialization
code.  This is guaranteed to fail, but the call of
futex_atomic_cmpxchg_inatomic() happens with pagefaults disabled.

On architectures, which use the asm-generic implementation or have a runtime
CPU feature detection, a -ENOSYS return value disables the PI/robust features.

On architectures with a working implementation the call returns -EFAULT and
the PI/robust features are enabled.

The relevant syscalls return -ENOSYS and the robust list exit code is blocked,
when the detection fails.

Fixes http://lkml.org/lkml/2008/2/11/149
Originally reported by: Lennart Buytenhek

Signed-off-by: Thomas Gleixner 
Acked-by: Ingo Molnar 
Cc: Lennert Buytenhek 
Cc: Riku Voipio 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Chris Wright 
Signed-off-by: Greg Kroah-Hartman

IRQ_NOPROBE helper functions

2008-03-24T18:47:09+00:00

Probing non-ISA interrupts using the handle_percpu_irq as their handle_irq
method may crash the system because handle_percpu_irq does not check
IRQ_WAITING.  This for example hits the MIPS Qemu configuration.

This patch provides two helper functions set_irq_noprobe and set_irq_probe to
set rsp.  clear the IRQ_NOPROBE flag.  The only current caller is MIPS code
but this really belongs into generic code.

As an aside, interrupt probing these days has become a mostly obsolete if not
dangerous art.  I think Linux interrupts should be changed to default to
non-probing but that's subject of this patch.

Signed-off-by: Ralf Baechle 
Acked-and-tested-by: Rob Landley 
Cc: Alan Cox 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Chris Wright 
Signed-off-by: Greg Kroah-Hartman