linux/drivers/firmware/efi
Ard Biesheuvel d1eb98143c efi/arm: Fix boot crash with CONFIG_CPUMASK_OFFSTACK=y
On ARM and arm64, we use a dedicated mm_struct to map the UEFI
Runtime Services regions, which allows us to map those regions
on demand, and in a way that is guaranteed to be compatible
with incoming kernels across kexec.

As it turns out, we don't fully initialize the mm_struct in the
same way as process mm_structs are initialized on fork(), which
results in the following crash on ARM if CONFIG_CPUMASK_OFFSTACK=y
is enabled:

  ...
  EFI Variables Facility v0.08 2004-May-17
  Unable to handle kernel NULL pointer dereference at virtual address 00000000
  [...]
  Process swapper/0 (pid: 1)
  ...
  __memzero()
  check_and_switch_context()
  virt_efi_get_next_variable()
  efivar_init()
  efivars_sysfs_init()
  do_one_initcall()
  ...

This is due to a missing call to mm_init_cpumask(), so add it.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: <stable@vger.kernel.org> # v4.5+
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1488395154-29786-1-git-send-email-ard.biesheuvel@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-03-02 08:11:19 +01:00
..
libstub efi/libstub: Treat missing SecureBoot variable as Secure Boot disabled 2017-03-02 08:11:18 +01:00
test efi/efi_test: Use memdup_user() as a cleanup 2016-10-18 17:11:19 +02:00
apple-properties.c x86/efi: Retrieve and assign Apple device properties 2016-11-13 08:23:16 +01:00
arm-init.c efi: Make EFI_MEMORY_ATTRIBUTES_TABLE initialization common across all architectures 2017-02-01 08:45:43 +01:00
arm-runtime.c efi/arm: Fix boot crash with CONFIG_CPUMASK_OFFSTACK=y 2017-03-02 08:11:19 +01:00
capsule-loader.c efi/capsule: Allocate whole capsule into virtual memory 2016-08-11 13:55:36 +02:00
capsule.c efi/capsule: Allocate whole capsule into virtual memory 2016-08-11 13:55:36 +02:00
cper.c efi: Handle memory error structures produced based on old versions of standard 2015-07-15 13:30:38 +01:00
dev-path-parser.c efi: Add device path parser 2016-11-13 08:23:15 +01:00
efi-pstore.c Fix bug in module unloading. 2016-10-06 15:16:16 -07:00
efi.c efi: Make EFI_MEMORY_ATTRIBUTES_TABLE initialization common across all architectures 2017-02-01 08:45:43 +01:00
efibc.c efibc: Report more information in the error messages 2016-06-27 13:06:54 +02:00
efivars.c efi: Don't use spinlocks for efi vars 2016-09-09 16:08:42 +01:00
esrt.c efi/esrt: Fix typo in pr_err() message 2017-02-01 08:45:45 +01:00
fake_mem.c x86/efi: Don't allocate memmap through memblock after mm_init() 2017-01-07 08:58:07 +01:00
Kconfig x86/efi: Retrieve and assign Apple device properties 2016-11-13 08:23:16 +01:00
Makefile x86/efi: Retrieve and assign Apple device properties 2016-11-13 08:23:16 +01:00
memattr.c x86/efi: Add support for EFI_MEMORY_ATTRIBUTES_TABLE 2017-02-01 08:45:44 +01:00
memmap.c x86/efi: Don't allocate memmap through memblock after mm_init() 2017-01-07 08:58:07 +01:00
reboot.c efi: Add 'capsule' update support 2016-04-28 11:34:03 +02:00
runtime-map.c efi/runtime-map: Use efi.memmap directly instead of a copy 2016-09-09 16:08:36 +01:00
runtime-wrappers.c efi: Replace runtime services spinlock with semaphore 2016-09-09 16:08:43 +01:00
vars.c efi: Don't use spinlocks for efi vars 2016-09-09 16:08:42 +01:00