Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Andy Lutomirski c4f9094070 membarrier: Explicitly sync remote cores when SYNC_CORE is requested ... commit 758c9373d84168dc7d039cf85a0e920046b17b41 upstream. membarrier() does not explicitly sync_core() remote CPUs; instead, it relies on the assumption that an IPI will result in a core sync. On x86, this may be true in practice, but it's not architecturally reliable. In particular, the SDM and APM do not appear to guarantee that interrupt delivery is serializing. While IRET does serialize, IPI return can schedule, thereby switching to another task in the same mm that was sleeping in a syscall. The new task could then SYSRET back to usermode without ever executing IRET. Make this more robust by explicitly calling sync_core_before_usermode() on remote cores. (This also helps people who search the kernel tree for instances of sync_core() and sync_core_before_usermode() -- one might be surprised that the core membarrier code doesn't currently show up in a such a search.) Fixes: 70216e18e5 ("membarrier: Provide core serializing command, *_SYNC_CORE") Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/776b448d5f7bd6b12690707f5ed67bcda7f1d427.1607058304.git.luto@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-12-21 13:27:07 +01:00
..
bpf	bpf: Zero-fill re-used per-cpu map element	2020-11-18 19:20:26 +01:00
cgroup	cgroup: fix cgroup_sk_alloc() for sk_clone_lock()	2020-07-22 09:32:49 +02:00
configs
debug	kgdb: Make "kgdbcon" work properly with "kgdb_earlycon"	2020-11-05 11:43:16 +01:00
dma	swiotlb: fix "x86: Don't panic if can not alloc buffer for swiotlb"	2020-11-18 19:20:32 +01:00
events	perf/core: Fix race in the perf_mmap_close() function	2020-11-18 19:20:33 +01:00
gcov	gcov: add support for GCC 10.1	2020-09-17 13:47:56 +02:00
irq	genirq/irqdomain: Add an irq_create_mapping_affinity() function	2020-12-11 13:23:30 +01:00
livepatch	livepatch: Nullify obj->mod in klp_module_coming()'s error path	2019-08-19 13:03:37 +02:00
locking	locking/lockdep: Decrement IRQ context counters when removing lock chain	2020-10-01 13:17:33 +02:00
power	PM: hibernate: remove the bogus call to get_gendisk() in software_resume()	2020-10-29 09:58:04 +01:00
printk	printk: handle blank console arguments passed in.	2020-10-01 13:18:04 +02:00
rcu	arm64: smp: Tell RCU about CPUs that fail to come online	2020-11-24 13:29:01 +01:00
sched	membarrier: Explicitly sync remote cores when SYNC_CORE is requested	2020-12-21 13:27:07 +01:00
time	tick/common: Touch watchdog in tick_unfreeze() on all CPUs	2020-11-18 19:20:26 +01:00
trace	tracing: Fix userstacktrace option for instances	2020-12-11 13:23:32 +01:00
.gitignore
acct.c
async.c
audit.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:30:59 +02:00
audit.h	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:30:59 +02:00
audit_fsnotify.c
audit_tree.c
audit_watch.c	audit: CONFIG_CHANGE don't log internal bookkeeping as an event	2020-10-01 13:17:32 +02:00
auditfilter.c	audit: fix a net reference leak in audit_list_rules_send()	2020-06-22 09:30:59 +02:00
auditsc.c
backtracetest.c
bounds.c
capability.c
compat.c
configs.c
context_tracking.c
cpu.c	sched/core: Fix illegal RCU from offline CPUs	2020-06-22 09:31:01 +02:00
cpu_pm.c	kernel/cpu_pm: Fix uninitted local in cpu_pm	2020-06-22 09:31:22 +02:00
crash_core.c
crash_dump.c
cred.c	keys: Fix request_key() cache	2020-01-17 19:48:42 +01:00
delayacct.c
dma.c
elfcore.c	kernel/elfcore.c: include proper prototypes	2019-09-25 17:51:39 -07:00
exec_domain.c
exit.c	don't dump the threads that had been already exiting when zapped.	2020-11-18 19:20:31 +01:00
extable.c	extable: Add function to search only kernel exception table	2019-08-21 22:23:48 +10:00
fail_function.c	fail_function: Remove a redundant mutex unlock	2020-11-24 13:29:18 +01:00
fork.c	fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent	2020-11-10 12:37:32 +01:00
freezer.c	Revert "libata, freezer: avoid block device removal while system is frozen"	2019-10-06 09:11:37 -06:00
futex.c	futex: Don't enable IRQs unconditionally in put_pi_state()	2020-11-18 19:20:30 +01:00
gen_kheaders.sh	kbuild: add variables for compression tools	2020-09-03 11:27:10 +02:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c	jump_label: Don't warn on __exit jump entries	2019-08-29 15:10:10 +01:00
kallsyms.c	kallsyms: Refactor kallsyms_show_value() to take cred	2020-07-16 08:16:44 +02:00
kcmp.c	kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve	2020-10-01 13:17:48 +02:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c	kexec_load: Disable at runtime if the kernel is locked down	2019-08-19 21:54:15 -07:00
kexec_core.c	kexec: bail out upon SIGKILL when allocating memory.	2019-09-25 17:51:40 -07:00
kexec_elf.c	kexec_elf: support 32 bit ELF files	2019-09-06 23:58:44 +02:00
kexec_file.c	Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-09-28 08:14:15 -07:00
kexec_internal.h
kheaders.c
kmod.c	kmod: make request_module() return an error when autoloading is disabled	2020-04-17 10:50:22 +02:00
kprobes.c	kprobes: Fix compiler warning for !CONFIG_KPROBES_ON_FTRACE	2020-10-01 13:18:25 +02:00
ksysfs.c
kthread.c	kthread_worker: prevent queuing delayed work from timer_fn when it is being canceled	2020-11-10 12:37:27 +01:00
latencytop.c
Makefile	kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()	2020-10-01 13:17:10 +02:00
module-internal.h
module.c	module: statically initialize init section freeing data	2020-10-29 09:57:55 +01:00
module_signature.c
module_signing.c
notifier.c	kernel/notifier.c: intercept duplicate registrations to avoid infinite loops	2020-10-01 13:17:23 +02:00
nsproxy.c
padata.c	padata: add separate cpuhp node for CPUHP_PADATA_DEAD	2020-06-17 16:40:22 +02:00
panic.c	panic: ensure preemption is disabled during panic()	2019-10-07 15:47:19 -07:00
params.c	lockdown: Lock down module params that specify hardware parameters (eg. ioport)	2019-08-19 21:54:16 -07:00
pid.c
pid_namespace.c
profile.c
ptrace.c	ptrace: Set PF_SUPERPRIV when checking capability	2020-11-24 13:29:24 +01:00
range.c
reboot.c	reboot: fix overflow parsing reboot cpu number	2020-11-18 19:20:30 +01:00
relay.c	kernel/relay.c: fix memleak on destroy relay channel	2020-08-26 10:40:51 +02:00
resource.c	/dev/mem: Revoke mappings when a driver claims the region	2020-06-24 17:50:35 +02:00
rseq.c
seccomp.c	seccomp: Set PF_SUPERPRIV when checking capability	2020-11-24 13:29:24 +01:00
signal.c	ptrace: fix task_join_group_stop() for the case when current is traced	2020-11-10 12:37:24 +01:00
smp.c
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c	stacktrace: Don't skip first entry on noncurrent tasks	2019-11-04 21:19:25 +01:00
stop_machine.c	stop_machine: Avoid potential race behaviour	2019-10-17 12:47:12 +02:00
sys.c	kernel/sys.c: avoid copying possible padding bytes in copy_to_user	2020-10-01 13:17:23 +02:00
sys_ni.c
sysctl-test.c	kernel/sysctl-test: Add null pointer test for sysctl.c:proc_dointvec()	2020-10-01 13:17:10 +02:00
sysctl.c	kernel: sysctl: make drop_caches write-only	2020-01-04 19:18:32 +01:00
sysctl_binary.c
task_work.c
taskstats.c	taskstats: fix data-race	2020-01-09 10:19:54 +01:00
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	usermodehelper: reset umask to default before executing user process	2020-10-14 10:32:58 +02:00
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c	watchdog/softlockup: Enforce that timestamp is valid on boot	2020-02-24 08:36:52 +01:00
watchdog_hld.c
workqueue.c	workqueue: Remove the warning in wq_worker_sleeping()	2020-10-01 13:17:54 +02:00
workqueue_internal.h