Alexander Shishkin 6f311381f3 perf: Synchronously free aux pages in case of allocation failure ... [ Upstream commit 45c815f06b80031659c63d7b93e580015d6024dd ] We are currently using asynchronous deallocation in the error path in AUX mmap code, which is unnecessary and also presents a problem for users that wish to probe for the biggest possible buffer size they can get: they'll get -EINVAL on all subsequent attemts to allocate a smaller buffer before the asynchronous deallocation callback frees up the pages from the previous unsuccessful attempt. Currently, gdb does that for allocating AUX buffers for Intel PT traces. More specifically, overwrite mode of AUX pmus that don't support hardware sg (some implementations of Intel PT, for instance) is limited to only one contiguous high order allocation for its buffer and there is no way of knowing its size without trying. This patch changes error path freeing to be synchronous as there won't be any contenders for the AUX pages at that point. Reported-by: Markus Metzger <markus.t.metzger@intel.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: vince@deater.net Link: http://lkml.kernel.org/r/1453216469-9509-1-git-send-email-alexander.shishkin@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-04-03 06:23:21 +02:00
..
bpf	bpf: Prevent memory disambiguation attack	2018-12-17 21:55:15 +01:00
configs	kconfig: tinyconfig: provide whole choice blocks to avoid warnings	2016-09-24 10:07:42 +02:00
debug	kdb: use memmove instead of overlapping memcpy	2018-12-13 09:21:29 +01:00
events	perf: Synchronously free aux pages in case of allocation failure	2019-04-03 06:23:21 +02:00
gcov	gcov: disable for COMPILE_TEST	2018-01-23 19:50:10 +01:00
irq	genirq: Fix race on spurious interrupt detection	2018-11-21 09:27:35 +01:00
livepatch	livepatch: x86: fix relocation computation with kASLR	2015-11-11 17:36:04 +01:00
locking	locking/lockdep: Add debug_locks check in __lock_downgrade()	2019-04-03 06:23:16 +02:00
power	PM / sleep: wakeup: Fix build error caused by missing SRCU support	2018-09-09 20:04:34 +02:00
printk	printk: Fix panic caused by passing log_buf_len to command line	2018-11-21 09:27:35 +01:00
rcu	rcu: Do RCU GP kthread self-wakeup from softirq and interrupt	2019-03-23 08:44:39 +01:00
sched	vmstat: make vmstat_updater deferrable again and shut down on idle	2019-04-03 06:23:21 +02:00
time	timekeeping: Use proper seqcount initializer	2019-02-20 10:13:08 +01:00
trace	tracing: Do not free iter->trace in fail path of tracing_open_pipe()	2019-03-23 08:44:35 +01:00
.gitignore	certs: add .gitignore to stop git nagging about x509_certificate_list	2015-10-21 15:18:35 +01:00
acct.c	kernel/acct.c: fix the acct->needcheck check in check_free_space()	2018-01-10 09:27:08 +01:00
async.c	kernel/async.c: revert "async: simplify lowest_in_progress()"	2018-02-16 20:09:45 +01:00
audit.c	audit: return on memory error to avoid null pointer dereference	2018-05-30 07:49:16 +02:00
audit.h	audit: audit_tree_match can be boolean	2015-11-04 08:23:51 -05:00
audit_fsnotify.c
audit_tree.c	audit: audit_tree_match can be boolean	2015-11-04 08:23:51 -05:00
audit_watch.c	audit: fix use-after-free in audit_add_watch	2018-09-26 08:35:08 +02:00
auditfilter.c	audit: allow not equal op for audit by executable	2018-08-06 16:24:38 +02:00
auditsc.c	audit: allow not equal op for audit by executable	2018-08-06 16:24:38 +02:00
backtracetest.c
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-11-21 09:27:35 +01:00
capability.c	exec: Ensure mm->user_ns contains the execed files	2017-01-06 11:16:14 +01:00
cgroup.c	cgroup: Fix deadlock in cpu hotplug path	2018-10-13 09:11:33 +02:00
cgroup_freezer.c	cgroup: fix handling of multi-destination migration from subtree_control enabling	2015-12-03 10:18:21 -05:00
cgroup_pids.c	cgroup_pids: don't account for the root cgroup	2015-12-03 10:18:21 -05:00
compat.c
configs.c
context_tracking.c	context_tracking: avoid irq_save/irq_restore on guest entry and exit	2015-11-10 12:06:23 +01:00
cpu.c	stable-fixup: hotplug: fix unused function warning	2017-01-12 11:22:48 +01:00
cpu_pm.c
cpuset.c	sched/cpuset/pm: Fix cpuset vs. suspend-resume bugs	2017-10-12 11:27:35 +02:00
crash_dump.c
cred.c	cred: Reject inodes with invalid ids in set_create_file_as()	2016-09-15 08:27:49 +02:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	kernel/exit.c: release ptraced tasks before zap_pid_ns_processes	2019-02-06 19:43:07 +01:00
extable.c	kernel/extable.c: mark core_kernel_text notrace	2017-07-21 07:44:56 +02:00
fork.c	fork: record start_time late	2019-01-13 10:05:32 +01:00
freezer.c
futex.c	futex: Ensure that futex address is aligned in handle_futex_death()	2019-04-03 06:23:15 +02:00
futex_compat.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-02-25 12:01:16 -08:00
groups.c	kernel: make groups_sort calling a responsibility group_info allocators	2018-01-10 09:27:10 +01:00
hung_task.c	kernel/hung_task.c: break RCU locks based on jiffies	2019-02-20 10:13:14 +01:00
irq_work.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
jump_label.c	jump_label: Invoke jump_label_test() via early_initcall()	2017-12-16 10:33:55 +01:00
kallsyms.c
kcmp.c	ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-02-25 12:01:16 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: use file name as the output message prefix	2015-11-06 17:50:42 -08:00
kexec_core.c	kexec: use file name as the output message prefix	2015-11-06 17:50:42 -08:00
kexec_file.c	kexec: fix double-free when failing to relocate the purgatory	2016-09-24 10:07:36 +02:00
kexec_internal.h
kmod.c	kmod: don't run async usermode helper as a child of kworker thread	2015-10-23 17:55:10 +09:00
kprobes.c	kprobes: Return error if we fail to reuse kprobe instead of BUG_ON()	2018-11-21 09:27:32 +01:00
ksysfs.c
kthread.c	kthread, tracing: Don't expose half-written comm when creating kthreads	2018-09-09 20:04:34 +02:00
latencytop.c
Makefile
membarrier.c	Fix: Disable sys_membarrier when nohz_full is enabled	2017-03-12 06:37:26 +01:00
memremap.c	mm, devm_memremap_pages: kill mapping "System RAM" support	2019-01-13 10:05:32 +01:00
module-internal.h
module.c	module: exclude SHN_UNDEF symbols from kallsyms api	2018-10-10 08:52:07 +02:00
module_signing.c	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
notifier.c
nsproxy.c
padata.c	padata: free correct variable	2017-05-20 14:27:02 +02:00
panic.c	kernel/panic.c: add missing \n	2017-07-05 14:37:19 +02:00
params.c	Nothing exciting, minor tweaks and cleanups.	2015-11-09 15:53:39 -08:00
pid.c	pidns: disable pid allocation if pid_ns_prepare_proc() is failed in alloc_pid()	2018-04-13 19:50:03 +02:00
pid_namespace.c	pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes	2017-05-25 14:30:11 +02:00
profile.c	profile: hide unused functions when !CONFIG_PROC_FS	2018-02-25 11:03:44 +01:00
ptrace.c	ptrace: Properly initialize ptracer_cred on fork	2017-06-14 13:16:20 +02:00
range.c
reboot.c
relay.c	kernel/relay.c: limit kmalloc size to KMALLOC_MAX_SIZE	2018-05-30 07:49:00 +02:00
resource.c	resource: fix integer overflow at reallocation	2018-04-24 09:32:05 +02:00
seccomp.c	seccomp: Move speculation migitation control to arch code	2018-07-25 10:18:27 +02:00
signal.c	signal: Restore the stop PTRACE_EVENT_EXIT	2019-02-20 10:13:23 +01:00
smp.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
smpboot.c	stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()	2015-10-20 10:23:55 +02:00
smpboot.h
softirq.c
stacktrace.c
stop_machine.c	kernel: remove stop_machine() Kconfig dependency	2015-12-12 10:15:34 -08:00
sys.c	sys: don't hold uts_sem while accessing userspace memory	2018-09-09 20:04:35 +02:00
sys_ni.c	mm: mlock: add new mlock system call	2015-11-05 19:34:48 -08:00
sysctl.c	kernel/sysctl.c: add missing range check in do_proc_dointvec_minmax_conv	2019-03-23 08:44:37 +01:00
sysctl_binary.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-04-12 09:08:58 -07:00
task_work.c
taskstats.c
test_kprobes.c
torture.c	torture: Consolidate cond_resched_rcu_qs() into stutter_wait()	2015-10-06 11:25:01 -07:00
tracepoint.c	tracepoint: Do not warn on ENOMEM	2018-05-16 10:06:47 +02:00
tsacct.c
uid16.c	kernel: make groups_sort calling a responsibility group_info allocators	2018-01-10 09:27:10 +01:00
up.c
user-return-notifier.c
user.c
user_namespace.c	userns: move user access out of the mutex	2018-09-09 20:04:35 +02:00
utsname.c
utsname_sysctl.c	sys: don't hold uts_sem while accessing userspace memory	2018-09-09 20:04:35 +02:00
watchdog.c	kernel/watchdog: use nmi registers snapshot in hardlockup handler	2017-01-06 11:16:16 +01:00
workqueue.c	workqueue: use put_device() instead of kfree()	2018-05-30 07:49:04 +02:00
workqueue_internal.h	workqueue: Fix NULL pointer dereference	2017-11-15 17:13:11 +01:00