Kan Liang e45d61c8da perf/core: Fix the same task check in perf_event_set_output ... [ Upstream commit 24d3ae2f37 ] The same task check in perf_event_set_output has some potential issues for some usages. For the current perf code, there is a problem if using of perf_event_open() to have multiple samples getting into the same mmap’d memory when they are both attached to the same process. https://lore.kernel.org/all/92645262-D319-4068-9C44-2409EF44888E@gmail.com/ Because the event->ctx is not ready when the perf_event_set_output() is invoked in the perf_event_open(). Besides the above issue, before the commit bd27568117 ("perf: Rewrite core context handling"), perf record can errors out when sampling with a hardware event and a software event as below. $ perf record -e cycles,dummy --per-thread ls failed to mmap with 22 (Invalid argument) That's because that prior to the commit a hardware event and a software event are from different task context. The problem should be a long time issue since commit c3f00c7027 ("perk: Separate find_get_context() from event initialization"). The task struct is stored in the event->hw.target for each per-thread event. It is a more reliable way to determine whether two events are attached to the same task. The event->hw.target was also introduced several years ago by the commit 50f16a8bf9 ("perf: Remove type specific target pointers"). It can not only be used to fix the issue with the current code, but also back port to fix the issues with an older kernel. Note: The event->hw.target was introduced later than commit c3f00c7027. The patch may cannot be applied between the commit c3f00c7027 and commit 50f16a8bf9. Anybody that wants to back-port this at that period may have to find other solutions. Fixes: c3f00c7027 ("perf: Separate find_get_context() from event initialization") Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Zhengjun Xing <zhengjun.xing@linux.intel.com> Link: https://lkml.kernel.org/r/20230322202449.512091-1-kan.liang@linux.intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-04-20 12:02:11 +02:00
..
bpf	bpf: Adjust insufficient default bpf_jit_limit	2023-04-05 11:14:15 +02:00
cgroup	memcg: fix possible use-after-free in memcg_write_event_control()	2022-12-14 11:26:13 +01:00
configs
debug	kdb: Make memory allocations more robust	2021-03-03 18:22:36 +01:00
events	perf/core: Fix the same task check in perf_event_set_output	2023-04-20 12:02:11 +02:00
gcov	gcov: add support for checksum field	2023-01-18 09:26:35 +01:00
irq	irqdomain: Drop bogus fwspec-mapping error handling	2023-03-11 16:26:47 +01:00
livepatch	livepatch: fix race between fork and KLP transition	2022-10-26 13:16:57 +02:00
locking	locking/lockdep: Avoid RCU-induced noinstr fail	2021-11-26 11:40:26 +01:00
power	PM: hibernate: Fix mistake in kerneldoc comment	2023-01-18 09:26:09 +01:00
printk	printk: fix return value of printk.devkmsg __setup handler	2022-04-20 09:08:15 +02:00
rcu	rcu: Suppress smp_processor_id() complaint in synchronize_rcu_expedited_wait()	2023-03-11 16:26:41 +01:00
sched	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:14:19 +02:00
time	timers: Prevent union confusion from unexpected restart_syscall()	2023-03-11 16:26:41 +01:00
trace	ftrace: Fix invalid address access in lookup_rec() when index is 0	2023-03-22 13:26:16 +01:00
.gitignore
acct.c	acct: fix potential integer overflow in encode_comp_t()	2023-01-18 09:26:30 +01:00
async.c	Revert "module, async: async_synchronize_full() on module init iff async is used"	2022-02-23 11:57:33 +01:00
audit.c	audit: improve audit queue handling when "audit=1" on cmdline	2022-02-08 18:16:28 +01:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-06-20 10:25:10 +02:00
audit_fsnotify.c	audit: fix potential double free on error path from fsnotify_add_inode_mark	2022-09-05 10:25:02 +02:00
audit_tree.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
audit_watch.c	audit: CONFIG_CHANGE don't log internal bookkeeping as an event	2020-10-01 13:12:33 +02:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-20 10:25:10 +02:00
auditsc.c	audit: print empty EXECVE args	2019-12-01 09:14:03 +01:00
backtracetest.c
bounds.c	kbuild: fix kernel/bounds.c 'W=1' warning	2018-11-13 11:15:08 -08:00
capability.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
compat.c	sched_getaffinity: don't assume 'cpumask_size()' is fully initialized	2023-04-05 11:14:19 +02:00
configs.c
context_tracking.c
cpu.c	random: clear fast pool, crng, and batches in cpuhp bring up	2022-06-25 11:46:35 +02:00
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-06-20 10:25:19 +02:00
crash_core.c	kdump: write correct address of mem_section into vmcoreinfo	2018-01-17 09:45:27 +01:00
crash_dump.c
cred.c	memcg: account security cred as well to kmemcg	2020-01-09 10:17:54 +01:00
delayacct.c	delayacct: Use raw_spinlocks	2018-08-03 07:50:38 +02:00
dma.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
exec_domain.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
exit.c	exit: Use READ_ONCE() for all oops/warn limit reads	2023-02-06 07:46:35 +01:00
extable.c
fork.c	mm/hugetlb: initialize hugetlb_usage in mm_init	2021-09-22 11:45:32 +02:00
freezer.c
futex.c	mm, futex: fix shared futex pgoff on shmem huge page	2021-07-11 12:48:12 +02:00
groups.c	kernel: make groups_sort calling a responsibility group_info allocators	2017-12-20 10:10:18 +01:00
hung_task.c	kernel: hung_task.c: disable on suspend	2019-04-20 09:15:05 +02:00
irq_work.c
jump_label.c	sched/core: Fix cpu.max vs. cpuhotplug deadlock	2018-12-05 19:41:17 +01:00
kallsyms.c	kallsyms: Don't let kallsyms_lookup_size_offset() fail on retrieving the first symbol	2019-09-21 07:15:38 +02:00
kcmp.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c	kcov: ensure irq code sees a valid area	2018-08-03 07:50:22 +02:00
kexec.c
kexec_core.c	kexec: Allocate decrypted control pages for kdump if SME is enabled	2019-11-24 08:23:15 +01:00
kexec_file.c	kexec_file: drop weak attribute from arch_kexec_apply_relocations[_add]	2022-07-02 16:18:11 +02:00
kexec_internal.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-24 08:00:44 +02:00
kprobes.c	x86/kprobes: Fix arch_check_optimized_kprobe check within optimized_kprobe range	2023-03-11 16:26:46 +01:00
ksysfs.c
kthread.c	kthread: prevent deadlock when kthread_mod_delayed_work() races with kthread_cancel_delayed_work_sync()	2021-07-11 12:48:13 +02:00
latencytop.c
Makefile	elfcore: fix building with clang	2021-02-10 09:12:08 +01:00
memremap.c	mm, devm_memremap_pages: kill mapping "System RAM" support	2019-01-13 10:01:02 +01:00
module-internal.h
module.c	module: Don't wait for GOING modules	2023-02-06 07:46:31 +01:00
module_signing.c
notifier.c	x86/mm: split vmalloc_sync_all()	2020-04-02 16:34:20 +02:00
nsproxy.c
padata.c	padata: purge get_cpu and reorder_via_wq from padata_do_serial	2020-05-27 16:43:05 +02:00
panic.c	exit: Use READ_ONCE() for all oops/warn limit reads	2023-02-06 07:46:35 +01:00
params.c
pid.c
pid_namespace.c	memcg: enable accounting for pids in nested pid namespaces	2021-09-22 11:45:32 +02:00
profile.c	profiling: fix shift too large makes kernel panic	2022-08-25 11:11:24 +02:00
ptrace.c	ptrace: Reimplement PTRACE_KILL by always sending SIGKILL	2022-06-14 16:53:43 +02:00
range.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
reboot.c	reboot: fix overflow parsing reboot cpu number	2020-11-18 18:28:02 +01:00
relay.c	kernel/relay.c: fix memleak on destroy relay channel	2020-08-26 10:29:54 +02:00
resource.c	resource: fix integer overflow at reallocation	2018-04-24 09:36:22 +02:00
seccomp.c	seccomp: Invalidate seccomp mode to catch death failures	2022-02-16 12:44:52 +01:00
signal.c	signal handling: don't use BUG_ON() for debugging	2022-07-21 20:42:47 +02:00
smp.c	smp: Fix offline cpu check in flush_smp_call_function_queue()	2022-04-20 09:08:33 +02:00
smpboot.c	kthread: Extract KTHREAD_IS_PER_CPU	2021-02-07 14:47:41 +01:00
smpboot.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
softirq.c	Mark HI and TASKLET softirq synchronous	2018-08-15 18:12:47 +02:00
stacktrace.c
stop_machine.c	stop_machine: Atomically queue and wake stopper threads	2018-09-05 09:26:36 +02:00
sys.c	prlimit: do_prlimit needs to have a speculation check	2023-01-24 07:05:18 +01:00
sys_ni.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
sysctl.c	proc: proc_skip_spaces() shouldn't think it is working on C strings	2022-12-08 11:16:33 +01:00
sysctl_binary.c	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
task_work.c	locking/barriers: Convert users of lockless_dereference() to READ_ONCE()	2017-12-25 14:26:21 +01:00
taskstats.c	taskstats: fix data-race	2020-01-09 10:17:53 +01:00
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Do not fail unregistering a probe due to memory failure	2021-03-03 18:22:47 +01:00
tsacct.c	taskstats: Cleanup the use of task->exit_code	2022-02-23 11:57:34 +01:00
ucount.c
uid16.c	kernel: make groups_sort calling a responsibility group_info allocators	2017-12-20 10:10:18 +01:00
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-14 09:51:10 +02:00
up.c	smp: Fix smp_call_function_single_async prototype	2021-05-22 10:57:35 +02:00
user-return-notifier.c
user.c
user_namespace.c	userns: move user access out of the mutex	2018-09-09 19:56:00 +02:00
utsname.c
utsname_sysctl.c	sys: don't hold uts_sem while accessing userspace memory	2018-09-09 19:56:00 +02:00
watchdog.c	watchdog/softlockup: Enforce that timestamp is valid on boot	2020-02-28 16:36:05 +01:00
watchdog_hld.c	watchdog: Mark watchdog touch functions as notrace	2018-09-05 09:26:42 +02:00
workqueue.c	workqueue: fix UAF in pwq_unbound_release_workfn()	2021-08-04 12:22:14 +02:00
workqueue_internal.h	Merge branch 'for-4.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2017-11-06 12:26:49 -08:00