----- Original Message ----- > > > ----- Original Message ----- > > Hi Dave, Hatayama-san, > > > > These patch series fix a problem that crash cannot open a dumpfile which is > > captured by "virsh dump --memory-only" or sadump on KASLR enabled kernel. > > > > When KASLR feature is enabled, a kernel is placed on the memory randomly and > > therefore crash cannot open 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 virsh dump > > or sadump does not have such a information. > > Hello Takao, > > Are you aware that the upstream maintainers of virsh are currently addressing the > issue by gathering and including phys_base in the ELF header and in the makedumpfile > kdump_sub_header? I haven't looked at this patch as of yet, but I worry whether > this will somehow interfere with virsh dump when it is released? The "virsh dump --memory-only" facility will copy all of the VMCOREINFO ELF note from kernel memory into the dumpfile, which since 4.10 includes the *value* of phys_base. Dave > > I don't know why sadump was never able to store phys_base. But I will > defer to Daisuke as to the sadump changes. > > Dave > > > > > > > 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. > > > > Takao Indoh (3): > > Introduce x86_64_kvtop_pagetable > > Fix a KASLR problem of virsh dump > > Fix a KASLR problem of sadump > > > > defs.h | 11 ++ > > netdump.c | 505 > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > netdump.h | 1 + > > sadump.c | 60 +++++++- > > sadump.h | 4 + > > symbols.c | 38 +++++ > > x86_64.c | 35 ++++- > > 7 files changed, 652 insertions(+), 2 deletions(-) > > > > -- > > 2.9.5 > > > > > > -- > > Crash-utility mailing list > > Crash-utility@xxxxxxxxxx > > https://www.redhat.com/mailman/listinfo/crash-utility > > > > -- > Crash-utility mailing list > Crash-utility@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/crash-utility > -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
