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Prakruthi Deepak Heragu b3c54971ba FROMLIST: arm64: paravirt: Use RCU read locks to guard stolen_time 
During hotplug, the stolen time data structure is unmapped and memset.
There is a possibility of the timer IRQ being triggered before memset
and stolen time is getting updated as part of this timer IRQ handler. This
causes the below crash in timer handler -

  [ 3457.473139][    C5] Unable to handle kernel paging request at virtual address ffffffc03df05148
  ...
  [ 3458.154398][    C5] Call trace:
  [ 3458.157648][    C5]  para_steal_clock+0x30/0x50
  [ 3458.162319][    C5]  irqtime_account_process_tick+0x30/0x194
  [ 3458.168148][    C5]  account_process_tick+0x3c/0x280
  [ 3458.173274][    C5]  update_process_times+0x5c/0xf4
  [ 3458.178311][    C5]  tick_sched_timer+0x180/0x384
  [ 3458.183164][    C5]  __run_hrtimer+0x160/0x57c
  [ 3458.187744][    C5]  hrtimer_interrupt+0x258/0x684
  [ 3458.192698][    C5]  arch_timer_handler_virt+0x5c/0xa0
  [ 3458.198002][    C5]  handle_percpu_devid_irq+0xdc/0x414
  [ 3458.203385][    C5]  handle_domain_irq+0xa8/0x168
  [ 3458.208241][    C5]  gic_handle_irq.34493+0x54/0x244
  [ 3458.213359][    C5]  call_on_irq_stack+0x40/0x70
  [ 3458.218125][    C5]  do_interrupt_handler+0x60/0x9c
  [ 3458.223156][    C5]  el1_interrupt+0x34/0x64
  [ 3458.227560][    C5]  el1h_64_irq_handler+0x1c/0x2c
  [ 3458.232503][    C5]  el1h_64_irq+0x7c/0x80
  [ 3458.236736][    C5]  free_vmap_area_noflush+0x108/0x39c
  [ 3458.242126][    C5]  remove_vm_area+0xbc/0x118
  [ 3458.246714][    C5]  vm_remove_mappings+0x48/0x2a4
  [ 3458.251656][    C5]  __vunmap+0x154/0x278
  [ 3458.255796][    C5]  stolen_time_cpu_down_prepare+0xc0/0xd8
  [ 3458.261542][    C5]  cpuhp_invoke_callback+0x248/0xc34
  [ 3458.266842][    C5]  cpuhp_thread_fun+0x1c4/0x248
  [ 3458.271696][    C5]  smpboot_thread_fn+0x1b0/0x400
  [ 3458.276638][    C5]  kthread+0x17c/0x1e0
  [ 3458.280691][    C5]  ret_from_fork+0x10/0x20

As a fix, introduce rcu lock to update stolen time structure.

Fixes: 75df529bec ("arm64: paravirt: Initialize steal time when cpu is online")
Cc: stable@vger.kernel.org
Acked-by: Will Deacon <will@kernel.org>
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Prakruthi Deepak Heragu <quic_pheragu@quicinc.com>
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>

Bug: 231271475
Link: https://lore.kernel.org/all/20220428183536.2866667-1-quic_eberman@quicinc.com/
Change-Id: Iac533d6a361a3ddacff315f8d9916af72b301383
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>
 		2022-05-04 17:33:03 +00:00
..
alpha rtc: Check return value from mc146818_get_time() 2022-04-13 20:59:14 +02:00
arc uaccess: fix type mismatch warnings from access_ok() 2022-04-08 14:24:01 +02:00
arm Merge 5.15.35 into android13-5.15 2022-04-24 16:58:59 +02:00
arm64 FROMLIST: arm64: paravirt: Use RCU read locks to guard stolen_time 2022-05-04 17:33:03 +00:00
csky uaccess: fix type mismatch warnings from access_ok() 2022-04-08 14:24:01 +02:00
h8300
…
hexagon uaccess: fix integer overflow on access_ok() 2022-03-28 09:58:45 +02:00
ia64 PCI/sysfs: Find shadow ROM before static attribute initialization 2022-02-01 17:27:05 +01:00
m68k m68k: coldfire/device.c: only build for MCF_EDMA when h/w macros are defined 2022-04-08 14:23:20 +02:00
microblaze uaccess: fix nios2 and microblaze get_user_8() 2022-04-08 14:23:18 +02:00
mips MIPS: ingenic: correct unit node address 2022-04-13 20:59:09 +02:00
nds32 nds32: fix access_ok() checks in get/put_user 2022-03-28 09:58:46 +02:00
nios2 uaccess: fix type mismatch warnings from access_ok() 2022-04-08 14:24:01 +02:00
openrisc openrisc: Add clone3 ABI wrapper 2022-01-27 11:04:10 +01:00
parisc parisc: Fix patch code locking and flushing 2022-04-13 20:59:14 +02:00
powerpc Merge 5.15.34 into android13-5.15 2022-04-24 16:57:32 +02:00
riscv riscv: Fixed misaligned memory access. Fixed pointer comparison. 2022-04-13 20:59:09 +02:00
s390 Merge 5.15.27 into android-5.15 2022-03-17 14:02:09 +01:00
sh Documentation, arch: Remove leftovers from CIFS_WEAK_PW_HASH 2022-01-27 11:05:21 +01:00
sparc uaccess: fix type mismatch warnings from access_ok() 2022-04-08 14:24:01 +02:00
um um: fix and optimize xor select template for CONFIG64 and timetravel mode 2022-04-13 20:58:59 +02:00
x86 ANDROID: gki - set CONFIG_USB_NET_AX88179_178A=y (usb gbit ethernet dongle) 2022-05-03 11:45:48 +00:00
xtensa xtensa: fix DTC warning unit_address_format 2022-04-13 20:59:09 +02:00
.gitignore
…
Kconfig FROMLIST: mm: x86: add CONFIG_ARCH_HAS_NONLEAF_PMD_YOUNG 2022-04-20 17:38:55 +00:00