Re: [PATCH 0/2] Add explicit coredump filtering for DAX mappings

[Ross Zwisler]

On Mon, Oct 05, 2015 at 04:33:35PM -0600, Ross Zwisler wrote:
> Add two new flags to the existing coredump mechanism for ELF files to allow
> us to explicitly filter DAX mappings.  This is desirable because DAX
> mappings, like hugetlb mappings, have the potential to be very large.
> 
> The coredump code relies on get_user_page() to populate the coredump file
> with the appropriate data, and for DAX mappings this currently fails.  This
> results in a hole being placed in the coredump file, so you end up reading
> back zeros.  Once the get_user_pages() patch series from Dan Williams [1]
> is merged, DAX core dumps will give real data.
> 
> I have a patch ready for core(5) to update the documentation on the new
> filtering flags.  I'll send it out once this gets merged.
> 
> [1] http://thread.gmane.org/gmane.linux.kernel.mm/139026
> 
> Ross Zwisler (2):
>   coredump: add DAX filtering for ELF coredumps
>   coredump: add DAX filtering for FDPIC ELF coredumps
> 
>  Documentation/filesystems/proc.txt | 22 ++++++++++++----------
>  fs/binfmt_elf.c                    | 10 ++++++++++
>  fs/binfmt_elf_fdpic.c              | 15 +++++++++++++++
>  include/linux/sched.h              |  4 +++-
>  4 files changed, 40 insertions(+), 11 deletions(-)
> 
> -- 
> 2.1.0

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