Sean Christopherson 8646e53633 KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest ... Invoke rseq's NOTIFY_RESUME handler when processing the flag prior to transferring to a KVM guest, which is roughly equivalent to an exit to userspace and processes many of the same pending actions. While the task cannot be in an rseq critical section as the KVM path is reachable only by via ioctl(KVM_RUN), the side effects that apply to rseq outside of a critical section still apply, e.g. the current CPU needs to be updated if the task is migrated. Clearing TIF_NOTIFY_RESUME without informing rseq can lead to segfaults and other badness in userspace VMMs that use rseq in combination with KVM, e.g. due to the CPU ID being stale after task migration. Fixes: 72c3c0fe54 ("x86/kvm: Use generic xfer to guest work function") Reported-by: Peter Foley <pefoley@google.com> Bisected-by: Doug Evans <dje@google.com> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Shakeel Butt <shakeelb@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210901203030.1292304-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2021-09-22 10:24:01 -04:00
..
bpf	bpf: Add oversize check before call kvcalloc()	2021-09-13 16:28:15 -07:00
cgroup	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf	2021-09-14 13:09:54 +01:00
configs
debug	kgdb patches for 5.15	2021-09-07 12:08:04 -07:00
dma	dma-mapping fixes for Linux 5.15	2021-09-17 11:54:48 -07:00
entry	KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest	2021-09-22 10:24:01 -04:00
events	events: Reuse value read using READ_ONCE instead of re-reading it	2021-09-15 17:49:06 +02:00
gcov
irq	powerpc updates for 5.15	2021-09-03 11:22:50 -07:00
kcsan	LKMM updates:	2021-09-02 13:00:15 -07:00
livepatch	livepatch: Replace deprecated CPU-hotplug functions.	2021-08-19 12:00:24 +02:00
locking	locking/rwbase: Take care of ordering guarantee for fastpath reader	2021-09-15 17:49:16 +02:00
power	Merge branches 'pm-pci', 'pm-sleep', 'pm-domains' and 'powercap'	2021-08-30 19:25:42 +02:00
printk	memblock: introduce saner 'memblock_free_ptr()' interface	2021-09-14 13:23:22 -07:00
rcu	Updates for locking and atomics:	2021-08-30 14:26:36 -07:00
sched	- Make sure the idle timer expires in hardirq context, on PREEMPT_RT	2021-09-12 11:37:41 -07:00
time	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
trace	Minor fixes to the processing of the bootconfig tree.	2021-09-11 10:16:30 -07:00
.gitignore
acct.c	kernel/acct.c: use dedicated helper to access rlimit values	2021-09-08 11:50:26 -07:00
async.c
audit_fsnotify.c
audit_tree.c	audit: move put_tree() to avoid trim_trees refcount underflow and UAF	2021-08-24 18:52:36 -04:00
audit_watch.c
audit.c
audit.h
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cfi.c
compat.c	arch: remove compat_alloc_user_space	2021-09-08 15:32:35 -07:00
configs.c
context_tracking.c
cpu_pm.c
cpu.c
crash_core.c
crash_dump.c
cred.c	ucounts: Increase ucounts reference counter before the security hook	2021-08-23 16:13:04 -05:00
delayacct.c
dma.c
exec_domain.c
exit.c	io_uring: remove files pointer in cancellation functions	2021-08-23 13:10:37 -06:00
extable.c
fail_function.c
fork.c	mm/hugetlb: initialize hugetlb_usage in mm_init	2021-09-08 18:45:53 -07:00
freezer.c
futex.c	futex: Remove unused variable 'vpid' in futex_proxy_trylock_atomic()	2021-09-03 23:00:22 +02:00
gen_kheaders.sh
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/rwlock: Provide RT variant	2021-08-17 17:50:51 +02:00
Kconfig.preempt
kcov.c
kexec_core.c	Merge branch 'rework/printk_safe-removal' into for-linus	2021-08-30 16:36:10 +02:00
kexec_elf.c
kexec_file.c
kexec_internal.h
kexec.c	kexec: avoid compat_alloc_user_space	2021-09-08 15:32:34 -07:00
kheaders.c
kmod.c
kprobes.c
ksysfs.c
kthread.c
latencytop.c
Makefile
module_signature.c
module_signing.c
module-internal.h
module.c
notifier.c
nsproxy.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
padata.c	padata: Remove repeated verbose license text	2021-08-27 16:30:18 +08:00
panic.c	Merge branch 'rework/printk_safe-removal' into for-linus	2021-08-30 16:36:10 +02:00
params.c
pid_namespace.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
pid.c
profile.c	profiling: fix shift-out-of-bounds bugs	2021-09-08 11:50:26 -07:00
ptrace.c
range.c
reboot.c
regset.c
relay.c
resource_kunit.c
resource.c
rseq.c	KVM: rseq: Update rseq when processing NOTIFY_RESUME on xfer to KVM guest	2021-09-22 10:24:01 -04:00
scftorture.c
scs.c
seccomp.c	Merge branch 'exit-cleanups-for-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2021-09-01 14:52:05 -07:00
signal.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
smp.c
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c
stop_machine.c
sys_ni.c	compat: remove some compat entry points	2021-09-08 15:32:35 -07:00
sys.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
sysctl-test.c
sysctl.c	Merge branch 'akpm' (patches from Andrew)	2021-09-03 10:08:28 -07:00
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c
up.c
user_namespace.c	memcg: enable accounting for new namesapces and struct nsproxy	2021-09-03 09:58:12 -07:00
user-return-notifier.c
user.c	fs/epoll: use a per-cpu counter for user's watches count	2021-09-08 11:50:27 -07:00
usermode_driver.c
utsname_sysctl.c
utsname.c
watch_queue.c
watchdog_hld.c
watchdog.c
workqueue_internal.h	workqueue: Assign a color to barrier work items	2021-08-17 07:49:10 -10:00
workqueue.c	workqueue: Assign a color to barrier work items	2021-08-17 07:49:10 -10:00