linux-toradex.git/kernel, branch v3.2.15-rt24

Merge commit 'v3.2.15' into rt-3.2.15-rt24

2012-04-14T14:13:39+00:00

cred: copy_process() should clear child->replacement_session_keyring

2012-04-13T15:33:50+00:00

commit 79549c6dfda0603dba9a70a53467ce62d9335c33 upstream.

keyctl_session_to_parent(task) sets ->replacement_session_keyring,
it should be processed and cleared by key_replace_session_keyring().

However, this task can fork before it notices TIF_NOTIFY_RESUME and
the new child gets the bogus ->replacement_session_keyring copied by
dup_task_struct(). This is obviously wrong and, if nothing else, this
leads to put_cred(already_freed_cred).

change copy_creds() to clear this member. If copy_process() fails
before this point the wrong ->replacement_session_keyring doesn't
matter, exit_creds() won't be called.

Signed-off-by: Oleg Nesterov 
Acked-by: David Howells 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

sysctl: fix write access to dmesg_restrict/kptr_restrict

2012-04-13T15:33:49+00:00

commit 620f6e8e855d6d447688a5f67a4e176944a084e8 upstream.

Commit bfdc0b4 adds code to restrict access to dmesg_restrict,
however, it incorrectly alters kptr_restrict rather than
dmesg_restrict.

The original patch from Richard Weinberger
(https://lkml.org/lkml/2011/3/14/362) alters dmesg_restrict as
expected, and so the patch seems to have been misapplied.

This adds the CAP_SYS_ADMIN check to both dmesg_restrict and
kptr_restrict, since both are sensitive.

Reported-by: Phillip Lougher 
Signed-off-by: Kees Cook 
Acked-by: Serge Hallyn 
Acked-by: Richard Weinberger 
Signed-off-by: James Morris 
Signed-off-by: Greg Kroah-Hartman

kgdb,debug_core: pass the breakpoint struct instead of address and memory

2012-04-13T15:33:48+00:00

commit 98b54aa1a2241b59372468bd1e9c2d207bdba54b upstream.

There is extra state information that needs to be exposed in the
kgdb_bpt structure for tracking how a breakpoint was installed.  The
debug_core only uses the the probe_kernel_write() to install
breakpoints, but this is not enough for all the archs.  Some arch such
as x86 need to use text_poke() in order to install a breakpoint into a
read only page.

Passing the kgdb_bpt structure to kgdb_arch_set_breakpoint() and
kgdb_arch_remove_breakpoint() allows other archs to set the type
variable which indicates how the breakpoint was installed.

Signed-off-by: Jason Wessel 
Signed-off-by: Greg Kroah-Hartman

tracing: Fix ent_size in trace output

2012-04-13T15:33:47+00:00

commit 12b5da349a8b94c9dbc3430a6bc42eabd9eaf50b upstream.

When reading the trace file, the records of each of the per_cpu buffers
are examined to find the next event to print out. At the point of looking
at the event, the size of the event is recorded. But if the first event is
chosen, the other events in the other CPU buffers will reset the event size
that is stored in the iterator descriptor, causing the event size passed to
the output functions to be incorrect.

In most cases this is not a problem, but for the case of stack traces, it
is. With the change to the stack tracing to record a dynamic number of
back traces, the output depends on the size of the entry instead of the
fixed 8 back traces. When the entry size is not correct, the back traces
would not be fully printed.

Note, reading from the per-cpu trace files were not affected.

Reported-by: Thomas Gleixner 
Tested-by: Thomas Gleixner 
Signed-off-by: Steven Rostedt 
Signed-off-by: Greg Kroah-Hartman

tracing: Fix ftrace stack trace entries

2012-04-13T15:33:47+00:00

commit 01de982abf8c9e10fc3089e10585cd2cc914bdab upstream.

8 hex characters tell only half the tale for 64 bit CPUs,
so use the appropriate length.

Link: http://lkml.kernel.org/r/1332411501-8059-2-git-send-email-wolfgang.mauerer@siemens.com

Signed-off-by: Wolfgang Mauerer 
Signed-off-by: Steven Rostedt 
Signed-off-by: Greg Kroah-Hartman

genirq: Adjust irq thread affinity on IRQ_SET_MASK_OK_NOCOPY return value

2012-04-13T15:33:46+00:00

commit f5cb92ac82d06cb583c1f66666314c5c0a4d7913 upstream.

irq_move_masked_irq() checks the return code of
chip->irq_set_affinity() only for 0, but IRQ_SET_MASK_OK_NOCOPY is
also a valid return code, which is there to avoid a redundant copy of
the cpumask. But in case of IRQ_SET_MASK_OK_NOCOPY we not only avoid
the redundant copy, we also fail to adjust the thread affinity of an
eventually threaded interrupt handler.

Handle IRQ_SET_MASK_OK (==0) and IRQ_SET_MASK_OK_NOCOPY(==1) return
values correctly by checking the valid return values seperately.

Signed-off-by: Jiang Liu 
Cc: Jiang Liu 
Cc: Keping Chen 
Link: http://lkml.kernel.org/r/1333120296-13563-2-git-send-email-jiang.liu@huawei.com
Signed-off-by: Thomas Gleixner 
Signed-off-by: Greg Kroah-Hartman

kconfig-preempt-rt-full.patch

2012-04-10T21:37:38+00:00

Signed-off-by: Thomas Gleixner

cpu: Make hotplug.lock a "sleeping" spinlock on RT

2012-04-10T21:37:37+00:00

Tasks can block on hotplug.lock in pin_current_cpu(), but their state
might be != RUNNING. So the mutex wakeup will set the state
unconditionally to RUNNING. That might cause spurious unexpected
wakeups. We could provide a state preserving mutex_lock() function,
but this is semantically backwards. So instead we convert the
hotplug.lock() to a spinlock for RT, which has the state preserving
semantics already.

Signed-off-by: Steven Rostedt 
Cc: Carsten Emde 
Cc: John Kacur 
Cc: Peter Zijlstra 
Cc: Clark Williams 
Cc: stable-rt@vger.kernel.org
Link: http://lkml.kernel.org/r/1330702617.25686.265.camel@gandalf.stny.rr.com
Signed-off-by: Thomas Gleixner

sched/rt: Fix wait_task_interactive() to test rt_spin_lock state

2012-04-10T21:37:36+00:00

The wait_task_interactive() will have a task sleep waiting for another
task to have a certain state. But it ignores the rt_spin_locks state
and can return with an incorrect result if the task it is waiting
for is blocked on a rt_spin_lock() and is waking up.

The rt_spin_locks save the tasks state in the saved_state field
and the wait_task_interactive() must also test that state.

Signed-off-by: Steven Rostedt 
Cc: Carsten Emde 
Cc: John Kacur 
Cc: Peter Zijlstra 
Cc: Clark Williams 
Cc: stable-rt@vger.kernel.org
Link: http://lkml.kernel.org/r/20120301190345.979435764@goodmis.org
Signed-off-by: Thomas Gleixner