linux-stable/arch/x86/platform
Matt Fleming 09503379dc x86/efi: Check status field to validate BGRT header
Madper reported seeing the following crash,

  BUG: unable to handle kernel paging request at ffffffffff340003
  IP: [<ffffffff81d85ba4>] efi_bgrt_init+0x9d/0x133
  Call Trace:
   [<ffffffff81d8525d>] efi_late_init+0x9/0xb
   [<ffffffff81d68f59>] start_kernel+0x436/0x450
   [<ffffffff81d6892c>] ? repair_env_string+0x5c/0x5c
   [<ffffffff81d68120>] ? early_idt_handlers+0x120/0x120
   [<ffffffff81d685de>] x86_64_start_reservations+0x2a/0x2c
   [<ffffffff81d6871e>] x86_64_start_kernel+0x13e/0x14d

This is caused because the layout of the ACPI BGRT header on this system
doesn't match the definition from the ACPI spec, and so we get a bogus
physical address when dereferencing ->image_address in efi_bgrt_init().

Luckily the status field in the BGRT header clearly marks it as invalid,
so we can check that field and skip BGRT initialisation.

Reported-by: Madper Xie <cxie@redhat.com>
Suggested-by: Toshi Kani <toshi.kani@hp.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
2014-02-14 10:07:15 +00:00
..
ce4100 arch/x86/platform/ce4100/ce4100.c: include reboot.h 2013-07-31 14:41:02 -07:00
efi x86/efi: Check status field to validate BGRT header 2014-02-14 10:07:15 +00:00
geode x86/geode: Fix incorrect placement of __initdata tag 2013-10-01 13:21:27 +02:00
goldfish goldfish: platform device for x86 2013-01-21 12:09:19 -08:00
intel-mid x86, intel-mid: Cleanup some platform code's header files 2014-01-28 15:13:40 -08:00
iris x86: Delete non-required instances of include <linux/init.h> 2014-01-06 21:25:18 -08:00
olpc ACPI: Clean up inclusions of ACPI header files 2013-12-07 01:03:14 +01:00
scx200 X86: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
sfi x86: Convert a few mistaken __cpuinit annotations to __init 2013-01-24 17:12:19 +01:00
ts5500 x86: Add TS-5500 platform support 2013-01-25 19:40:23 +01:00
uv x86/uv/nmi, kgdb/kdb: Fix UV NMI handler when KDB not configured 2014-01-25 08:55:11 +01:00
visws x86/apic: Fix typo EIO_ACK -> EOI_ACK and document it 2012-05-18 09:46:07 +02:00
Makefile intel_mid: Renamed *mrst* to *intel_mid* 2013-10-17 16:40:36 -07:00