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

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Message-ID: <20151013225415.GA25616@linux.intel.com>
Date:	Tue, 13 Oct 2015 16:54:15 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Ingo Molnar <mingo@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-doc@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>,
	linux-nvdimm@...ts.01.org,
	Matthew Wilcox <matthew.r.wilcox@...el.com>
Subject: Re: [PATCH 0/2] Add explicit coredump filtering for DAX mappings

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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