[makedumpfile PATCH v3 0/4] Fix KASLR problem on sadump

[Takao Indoh]

Hi Kumagai-san, Hatayama-san,

These patch series fix a problem that makedumpfile cannot handle a dumpfile
which is captured by sadump on KASLR enabled kernel.

When KASLR feature is enabled, a kernel is placed on the memory randomly and
therefore makedumpfile cannot handle a dumpfile because addresses of kernel
symbols in vmlinux are different from actual addresses. In the case of kdump,
information to get actual address is included in the vmcoreinfo, but dumpfile of
sadump does not have such a information.

These patches calculate kaslr offset and phys_base to solve this problem. The
basic idea is getting register (IDTR and CR3) from dump header, and calculate
kaslr_offset/phys_base using them.

changelog:
v3:
- Split patch 3/3 into two parts
  - core part to calculate kaslr_offset and phys_base
  - Additional part to fix this problem during kdump

v2:
http://lists.infradead.org/pipermail/kexec/2017-October/019554.html
- Change get_vec0_addr style
- Some tiny fixes

v1:
http://lists.infradead.org/pipermail/kexec/2017-October/019530.html

Takao Indoh (4):
  Support symbol __cpu_online_mask
  Introduce vtop4_x86_64_pagetable
  sadump: Fix a KASLR problem of sadump
  sadump: Fix a KASLR problem of sadump while kdump is working

 arch/x86_64.c  |  30 ++++-
 makedumpfile.c |  20 ++-
 makedumpfile.h |   8 +-
 sadump_info.c  | 417 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 4 files changed, 462 insertions(+), 13 deletions(-)

-- 
2.9.5