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Steven Rostedt (Red Hat) a5c09d4c03 ring-buffer: Check if buffer exists before polling 
commit 8b8b36834d upstream.

The per_cpu buffers are created one per possible CPU. But these do
not mean that those CPUs are online, nor do they even exist.

With the addition of the ring buffer polling, it assumes that the
caller polls on an existing buffer. But this is not the case if
the user reads trace_pipe from a CPU that does not exist, and this
causes the kernel to crash.

Simple fix is to check the cpu against buffer bitmask against to see
if the buffer was allocated or not and return -ENODEV if it is
not.

More updates were done to pass the -ENODEV back up to userspace.

Link: http://lkml.kernel.org/r/5393DB61.6060707@oracle.com

Reported-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2014-07-17 16:21:06 -07:00
..
cpu sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding 2014-01-13 17:38:55 +01:00
debug kgdb/kdb: Fix no KDB config problem 2014-01-25 08:55:09 +01:00
events perf: Fix race in removing an event 2014-06-11 11:54:08 -07:00
gcov gcov: reuse kbasename helper 2013-11-13 12:09:34 +09:00
irq genirq: Sanitize spurious interrupt detection of threaded irqs 2014-06-30 20:12:00 -07:00
locking rtmutex: Plug slow unlock race 2014-06-30 20:11:58 -07:00
power arm, pm, vmpressure: add missing slab.h includes 2014-02-03 13:24:01 -05:00
printk printk: fix syslog() overflowing user buffer 2014-02-17 12:24:45 -08:00
rcu Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2014-01-28 08:38:04 -08:00
sched sched: Fix sched_policy < 0 comparison 2014-06-11 11:54:11 -07:00
time tick-sched: Check tick_nohz_enabled in tick_nohz_switch_to_nohz() 2014-05-31 13:20:28 -07:00
trace ring-buffer: Check if buffer exists before polling 2014-07-17 16:21:06 -07:00
.gitignore Ignore generated file kernel/x509_certificate_list 2013-12-10 18:21:34 +00:00
Kconfig.freezer
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Kconfig.hz kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS 2013-11-15 09:32:22 +09:00
Kconfig.locks
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Kconfig.preempt
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Makefile KEYS: Remove files generated when SYSTEM_TRUSTED_KEYRING=y 2013-12-13 15:59:11 +00:00
acct.c
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async.c
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audit.c net: Use netlink_ns_capable to verify the permisions of netlink messages 2014-06-26 15:15:38 -04:00
audit.h audit: Use struct net not pid_t to remember the network namespce to reply in 2014-02-28 04:04:33 -08:00
audit_tree.c inotify: Fix reporting of cookies for inotify events 2014-02-18 11:17:17 +01:00
audit_watch.c inotify: Fix reporting of cookies for inotify events 2014-02-18 11:17:17 +01:00
auditfilter.c audit: Update kdoc for audit_send_reply and audit_list_rules_send 2014-03-08 15:31:54 -08:00
auditsc.c audit: remove superfluous new- prefix in AUDIT_LOGIN messages 2014-07-09 11:18:28 -07:00
backtracetest.c
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bounds.c mm: do not allocate page->ptl dynamically, if spinlock_t fits to long 2013-12-20 12:25:45 -08:00
capability.c fs,userns: Change inode_capable to capable_wrt_inode_uidgid 2014-06-16 13:40:32 -07:00
cgroup.c cgroup: fix a failure path in create_css() 2014-03-18 17:15:36 -04:00
cgroup_freezer.c cgroup: replace cftype->read_seq_string() with cftype->seq_show() 2013-12-05 12:28:04 -05:00
compat.c
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configs.c
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context_tracking.c context_tracking: Wrap static key check into more intuitive function name 2013-12-02 20:43:14 +01:00
cpu.c sched: Fix hotplug vs. set_cpus_allowed_ptr() 2014-06-11 11:54:11 -07:00
cpu_pm.c
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cpuset.c cpuset,mempolicy: fix sleeping function called from invalid context 2014-07-17 16:21:03 -07:00
crash_dump.c
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cred.c
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delayacct.c kernel/delayacct.c: remove redundant checking in __delayacct_add_tsk() 2013-11-13 12:09:12 +09:00
dma.c
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elfcore.c switch elf_core_write_extra_phdrs() to dump_emit() 2013-11-09 00:16:23 -05:00
exec_domain.c
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exit.c exit: call disassociate_ctty() before exit_task_namespaces() 2014-04-26 17:19:07 -07:00
extable.c kernel/extable: fix address-checks for core_kernel and init areas 2013-11-28 09:49:41 -08:00
fork.c tracing: Fix syscall_*regfunc() vs copy_process() race 2014-07-06 18:57:29 -07:00
freezer.c libata, freezer: avoid block device removal while system is frozen 2013-12-19 13:50:32 -05:00
futex.c futex: Make lookup_pi_state more robust 2014-06-07 10:28:29 -07:00
futex_compat.c
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groups.c
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hrtimer.c hrtimer: Set expiry time before switch_hrtimer_base() 2014-06-07 10:28:12 -07:00
hung_task.c hung_task: Display every hung task warning 2014-01-25 12:13:33 +01:00
irq_work.c
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itimer.c
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jump_label.c
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kallsyms.c
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kcmp.c
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kexec.c powerpc, kexec: Fix "Processor X is stuck" issue during kexec from ST mode 2014-06-07 10:28:28 -07:00
kmod.c execve: use 'struct filename *' for executable name passing 2014-02-05 12:54:53 -08:00
kprobes.c kprobes: use KSYM_NAME_LEN to size identifier buffers 2013-11-13 12:09:26 +09:00
ksysfs.c kdump: fix exported size of vmcoreinfo note 2014-01-23 16:37:03 -08:00
kthread.c kthread: fix return value of kthread_create() upon SIGKILL. 2014-06-30 20:11:53 -07:00
latencytop.c
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module-internal.h
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module.c module: remove warning about waiting module removal. 2014-06-07 10:28:11 -07:00
module_signing.c
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notifier.c
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nsproxy.c
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padata.c padata: Fix wrong usage of rcu_dereference() 2013-12-05 21:28:42 +08:00
panic.c panic: Make panic_timeout configurable 2013-11-26 12:12:26 +01:00
params.c params: improve standard definitions 2013-12-04 14:09:46 +10:30
pid.c
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pid_namespace.c pid_namespace: pidns_get() should check task_active_pid_ns() != NULL 2014-04-26 17:19:04 -07:00
posix-cpu-timers.c posix-timers: Convert abuses of BUG_ON to WARN_ON 2013-12-09 16:56:29 +01:00
posix-timers.c
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profile.c mm: fix GFP_THISNODE callers and clarify 2014-03-10 17:26:19 -07:00
ptrace.c exec/ptrace: fix get_dumpable() incorrect tests 2013-11-13 12:09:33 +09:00
range.c
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reboot.c kexec: migrate to reboot cpu 2013-12-18 19:04:50 -08:00
relay.c
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res_counter.c
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resource.c
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seccomp.c
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signal.c kernel/signal.c: change do_signal_stop/do_sigaction to use while_each_thread() 2014-01-23 16:37:02 -08:00
smp.c kernel/smp.c: remove cpumask_ipi 2014-01-30 16:56:54 -08:00
smpboot.c
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smpboot.h
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softirq.c Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2014-01-31 09:02:51 -08:00
stacktrace.c
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stop_machine.c stop_machine: Fix^2 race between stop_two_cpus() and stop_cpus() 2014-03-11 11:33:47 +01:00
sys.c kernel/sys.c: k_getrusage() can use while_each_thread() 2014-01-23 16:37:02 -08:00
sys_ni.c
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sysctl.c mm, pcp: allow restoring percpu_pagelist_fraction default 2014-07-09 11:18:26 -07:00
sysctl_binary.c kernel/sysctl_binary.c: use scnprintf() instead of snprintf() 2013-11-13 12:09:33 +09:00
system_certificates.S KEYS: correct alignment of system_certificate_list content in assembly file 2013-12-10 18:25:28 +00:00
system_keyring.c KEYS: correct alignment of system_certificate_list content in assembly file 2013-12-10 18:25:28 +00:00
task_work.c
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taskstats.c genetlink: only pass array to genl_register_family_with_ops() 2013-11-19 16:39:05 -05:00
test_kprobes.c
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time.c
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timeconst.bc
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timer.c timer: Prevent overflow in apply_slack 2014-06-07 10:28:09 -07:00
tracepoint.c tracepoint: Do not waste memory on mods with no tracepoints 2014-05-31 13:20:28 -07:00
tsacct.c
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uid16.c
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up.c kernel: provide a __smp_call_function_single stub for !CONFIG_SMP 2013-11-15 09:32:22 +09:00
user-return-notifier.c
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user.c KEYS: fix uninitialized persistent_keyring_register_sem 2013-12-13 15:59:11 +00:00
user_namespace.c user namespace: fix incorrect memory barriers 2014-04-26 17:19:02 -07:00
utsname.c
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utsname_sysctl.c
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watchdog.c kernel/watchdog.c: remove preemption restrictions when restarting lockup detector 2014-07-06 18:57:27 -07:00
workqueue.c workqueue: zero cpumask of wq_numa_possible_cpumask on init 2014-07-17 16:21:03 -07:00
workqueue_internal.h
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