Linus Torvalds d26d45253b Kprobes now uses the function tracer if it can. That is, if a probe ... is placed on a function mcount/nop location, and the arch supports it, instead of adding a breakpoint, kprobes will register a function callback as that is much more efficient. The function tracer requires to update modules before they run, and uses the module notifier to do so. But if something else in the module notifiers registers a kprobe at one of these locations, before ftrace can get to it, then the system could fail. The function tracer must be initialized early, otherwise module notifiers that probe will only work by chance. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iQEcBAABAgAGBQJQ/ZaaAAoJEOdOSU1xswtMQsoH/02S5ngidMgIXwYCGzwxR6Ym f2krSz76rBkFn9ivFPJFfq2Wi05UhhVfFr4gpKzoK+/rBqwVkV5tRIQ4AhJ1/Q3d wCXB2mcRI6ky/kB/ts8q6gjj+rlJ18NgZf79TA5y5q7FEYc6DvB2dZ+vE+rvCnXk q/Bx6q4phEdLbVqet+Ga36qzi9u+pW0P+ntZmi0EQLVnz9p+mtdVaRz32qKp0FYi XhHtPMHQDZoOu8utPNtPcfSOZp1sNN8tXqjEAJ4/Ba54badUfg4WJ+RXGPsYH+4T lOwpVv7Xp0Sp2b1HivEVfCs1bx2RNzluZisPahBEwdBv+XssvqMbAfG+X3EVk3w= =6EYI -----END PGP SIGNATURE----- Merge tag 'trace-3.8-rc4-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull ftrace fix from Steven Rostedt: "Kprobes now uses the function tracer if it can. That is, if a probe is placed on a function mcount/nop location, and the arch supports it, instead of adding a breakpoint, kprobes will register a function callback as that is much more efficient. The function tracer requires to update modules before they run, and uses the module notifier to do so. But if something else in the module notifiers registers a kprobe at one of these locations, before ftrace can get to it, then the system could fail. The function tracer must be initialized early, otherwise module notifiers that probe will only work by chance." * tag 'trace-3.8-rc4-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ftrace: Be first to run code modification on modules		2013-01-22 10:30:49 -08:00
..
debug	module: add new state MODULE_STATE_UNFORMED.	2013-01-12 13:27:05 +10:30
events	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-12-17 15:44:47 -08:00
gcov
irq	irq: tsk->comm is an array	2012-12-18 15:02:11 -08:00
power	Merge branch 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-12-12 08:18:24 -08:00
sched	wake_up_process() should be never used to wakeup a TASK_STOPPED/TRACED task	2013-01-22 10:08:17 -08:00
time	Merge tag 'kvm-3.8-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2012-12-13 15:31:08 -08:00
trace	ftrace: Be first to run code modification on modules	2013-01-21 13:21:50 -05:00
.gitignore
acct.c	vfs: make path_openat take a struct filename pointer	2012-10-12 20:15:09 -04:00
async.c	module, async: async_synchronize_full() on module init iff async is used	2013-01-16 09:05:33 -08:00
audit_tree.c	audit: catch possible NULL audit buffers	2013-01-11 14:54:55 -08:00
audit_watch.c	audit: catch possible NULL audit buffers	2013-01-11 14:54:55 -08:00
audit.c	kernel/audit.c: avoid negative sleep durations	2013-01-11 14:54:56 -08:00
audit.h	audit: optimize audit_compare_dname_path	2012-10-12 00:32:02 -04:00
auditfilter.c	audit: fix auditfilter.c kernel-doc warnings	2013-01-10 14:35:23 -08:00
auditsc.c	audit: catch possible NULL audit buffers	2013-01-11 14:54:55 -08:00
backtracetest.c
bounds.c
capability.c	userns: Teach inode_capable to understand inodes whose uids map to other namespaces.	2012-05-15 14:59:24 -07:00
cgroup_freezer.c	cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()	2012-11-19 08:13:38 -08:00
cgroup.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-12-17 20:58:12 -08:00
compat.c	x32: fix sigtimedwait	2012-12-26 01:15:03 -05:00
configs.c
context_tracking.c	context_tracking: New context tracking susbsystem	2012-11-30 11:40:07 -08:00
cpu_pm.c	kernel/cpu_pm.c: fix various typos	2012-05-31 17:49:27 -07:00
cpu.c	Merge branch 'x86-bsp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-12-11 19:56:33 -08:00
cpuset.c	cpuset: use N_MEMORY instead N_HIGH_MEMORY	2012-12-12 17:38:32 -08:00
crash_dump.c
cred.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-12-18 10:55:28 -08:00
delayacct.c
dma.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
elfcore.c
exec_domain.c
exit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-12-17 15:44:47 -08:00
extable.c	extable: Skip sorting if sorted at build time.	2012-04-19 15:06:55 -07:00
fork.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal	2013-01-20 13:58:48 -08:00
freezer.c	freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()	2012-10-26 14:27:49 -07:00
futex_compat.c	futex: Mark get_robust_list as deprecated	2012-03-29 11:37:17 +02:00
futex.c	futex: avoid wake_futex() for a PI futex_q	2012-11-26 17:41:24 -08:00
groups.c	userns: Convert in_group_p and in_egroup_p to use kgid_t	2012-05-03 03:29:33 -07:00
hrtimer.c	hrtimer: Update hrtimer base offsets each hrtimer_interrupt	2012-07-11 23:34:39 +02:00
hung_task.c	hung task debugging: Inject NMI when hung and going to panic	2012-04-25 12:39:25 +02:00
irq_work.c	irq_work: fix compile failure on tile from missing include	2012-04-13 13:15:16 -04:00
itimer.c	itimer: Use printk_once instead of WARN_ONCE	2012-04-10 11:00:30 +02:00
jump_label.c	jump_label: Export jump_label_rate_limit()	2012-08-06 19:00:35 +03:00
kallsyms.c	vsprintf: fix %ps on non symbols when using kallsyms	2012-05-29 16:22:32 -07:00
kcmp.c	kcmp: include linux/ptrace.h	2012-12-20 17:40:19 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking: Adjust spin lock inlining Kconfig options	2012-09-13 17:56:13 +02:00
Kconfig.preempt	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
kexec.c	kdump: remove unneeded include	2012-10-06 03:05:19 +09:00
kfifo.c	[media] kernel:kfifo: export __kfifo_max_r symbol	2012-04-11 18:24:37 -03:00
kmod.c	Bury the conditionals from kernel_thread/kernel_execve series	2012-12-19 18:07:38 -05:00
kprobes.c	kprobes/x86: Fix to support jprobes on ftrace-based kprobe	2012-09-13 22:52:11 -04:00
ksysfs.c	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-12-11 18:10:49 -08:00
kthread.c	kthread: use N_MEMORY instead N_HIGH_MEMORY	2012-12-12 17:38:33 -08:00
latencytop.c
lglock.c	brlocks/lglocks: turn into functions	2012-05-29 23:28:41 -04:00
lockdep_internals.h
lockdep_proc.c	lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()	2012-10-24 12:39:09 +02:00
lockdep_states.h
lockdep.c	lockdep: Check if nested lock is actually held	2012-09-13 17:00:44 +02:00
Makefile	Nothing all that exciting; a new module-from-fd syscall for those who want	2012-12-19 07:55:08 -08:00
modsign_certificate.S	MODSIGN: Avoid using .incbin in C source	2012-12-14 13:06:44 +10:30
modsign_pubkey.c	keys: use keyring_alloc() to create module signing keyring	2012-12-20 17:40:21 -08:00
module_signing.c	MODSIGN: Don't use enum-type bitfields in module signature info block	2012-12-05 11:27:24 +10:30
module-internal.h	MODSIGN: Move the magic string to the end of a module and eliminate the search	2012-10-19 17:30:40 -07:00
module.c	module: fix missing module_mutex unlock	2013-01-20 20:22:58 -08:00
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c	userns: Implement unshare of the user namespace	2012-11-20 04:18:14 -08:00
padata.c	padata: use __this_cpu_read per-cpu helper	2012-12-06 17:16:23 +08:00
panic.c	panic: fix a possible deadlock in panic()	2012-07-30 17:25:13 -07:00
params.c	params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)	2012-05-04 17:28:18 -07:00
pid_namespace.c	pidns: Stop pid allocation when init dies	2012-12-25 16:10:05 -08:00
pid.c	pidns: Stop pid allocation when init dies	2012-12-25 16:10:05 -08:00
posix-cpu-timers.c	A few /dev/random improvements for the v3.8 merge window.	2012-12-19 20:23:37 -08:00
posix-timers.c
printk.c	printk: fix incorrect length from print_time() when seconds > 99999	2013-01-04 16:11:48 -08:00
profile.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
ptrace.c	ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL	2013-01-22 10:08:00 -08:00
range.c
rcu.h	rcu: Add a module parameter to force use of expedited RCU primitives	2012-10-23 14:54:08 -07:00
rcupdate.c	rcu: Add a module parameter to force use of expedited RCU primitives	2012-10-23 14:54:08 -07:00
rcutiny_plugin.h	rcu: Add a module parameter to force use of expedited RCU primitives	2012-10-23 14:54:08 -07:00
rcutiny.c	rcu: Fix TINY_RCU rcu_is_cpu_rrupt_from_idle check	2012-11-13 14:08:34 -08:00
rcutorture.c	Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD	2012-11-16 09:59:58 -08:00
rcutree_plugin.h	rcu: Separate accounting of callbacks from callback-free CPUs	2012-11-16 10:05:57 -08:00
rcutree_trace.c	rcu: Separate accounting of callbacks from callback-free CPUs	2012-11-16 10:05:57 -08:00
rcutree.c	context_tracking: New context tracking susbsystem	2012-11-30 11:40:07 -08:00
rcutree.h	rcu: Separate accounting of callbacks from callback-free CPUs	2012-11-16 10:05:57 -08:00
relay.c	splice: fix racy pipe->buffers uses	2012-06-13 21:16:42 +02:00
res_counter.c	res_counter: return amount of charges after res_counter_uncharge()	2012-12-18 15:02:12 -08:00
resource.c	kernel/resource.c: fix stack overflow in __reserve_region_with_split()	2012-10-06 03:05:31 +09:00
rtmutex_common.h
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rwsem.c	lockdep, rwsem: provide down_write_nest_lock()	2013-01-11 14:54:55 -08:00
seccomp.c	seccomp: Make syscall skipping and nr changes more consistent	2012-10-02 21:14:29 +10:00
semaphore.c	semaphore: fix improper comment reference to mutex	2012-04-05 17:15:55 -07:00
signal.c	ptrace: ensure arch_ptrace/ptrace_request can never race with SIGKILL	2013-01-22 10:08:00 -08:00
smp.c	smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]()	2012-06-05 17:27:14 +02:00
smpboot.c	hotplug: Fix UP bug in smpboot hotplug code	2012-08-13 17:01:07 +02:00
smpboot.h	smpboot: Provide infrastructure for percpu hotplug threads	2012-08-13 17:01:07 +02:00
softirq.c	cputime: Specialize irq vtime hooks	2012-10-29 21:31:32 +01:00
spinlock.c	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
srcu.c	Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD	2012-11-16 09:59:58 -08:00
stacktrace.c
stop_machine.c
sys_ni.c	module: add syscall to load module from fd	2012-12-14 13:05:22 +10:30
sys.c	cputime: Rename thread_group_times to thread_group_cputime_adjusted	2012-11-28 17:07:57 +01:00
sysctl_binary.c	pidns: Use task_active_pid_ns where appropriate	2012-11-19 05:59:09 -08:00
sysctl.c	Automatic NUMA Balancing V11	2012-12-16 15:18:08 -08:00
task_work.c	task_work: task_work_add() should not succeed after exit_task_work()	2012-09-13 16:47:34 +02:00
taskstats.c	taskstats: cgroupstats_user_cmd() may leak on error	2012-10-06 03:05:31 +09:00
test_kprobes.c
time.c	time: Move update_vsyscall definitions to timekeeper_internal.h	2012-09-24 12:38:06 -04:00
timeconst.pl
timer.c	timers: Fix endless looping between cascade() and internal_add_timer()	2012-10-09 21:27:14 +02:00
tracepoint.c
tsacct.c	userns: Convert taskstats to handle the user and pid namespaces.	2012-09-18 01:01:32 -07:00
uid16.c	userns: Convert setting and getting uid and gid system calls to use kuid and kgid	2012-05-03 03:28:41 -07:00
up.c
user_namespace.c	userns: Fix typo in description of the limitation of userns_install	2012-12-14 18:36:36 -08:00
user-return-notifier.c
user.c	proc: Usable inode numbers for the namespace file descriptors.	2012-11-20 04:19:49 -08:00
utsname_sysctl.c
utsname.c	userns: Require CAP_SYS_ADMIN for most uses of setns.	2012-12-14 16:12:03 -08:00
wait.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
watchdog.c	watchdog: Fix disable/enable regression	2012-12-19 12:10:33 -08:00
workqueue_sched.h
workqueue.c	Merge branch 'for-3.8' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2012-12-12 08:15:13 -08:00