linux-kernel - [PATCH 0/2] ptrace: add ability to attach a file descriptor to another process

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Date:	Fri, 16 Dec 2011 13:46:21 +0300
From:	Andrew Vagin <avagin@...nvz.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fsdevel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Tejun Heo <tj@...nel.org>
Subject: [PATCH 0/2] ptrace: add ability to attach a file descriptor to another process

We need this functionality for checkpointing processes.  Now some parts
are dumped with help PTRACE_SEIZE.  Parasite code is injected to process
and it collects information.  This code should save data to somewhere.
I want to suggest a scheme, when a dumper creates file descriptor and
attaches it to a target process, then execute parasite code, which closes
this descriptor at the end.

We can't create unix sockets or open files, because a process may
be in another namespaces.

Signed-off-by: Andrew Vagin <avagin@...nvz.org>

Andrew Vagin (2):
  fs: add ability attaching and allocating fd for non current tasks
  ptrace: add ability to attach a file descriptor to another process

 fs/file.c              |    9 +++++++--
 fs/open.c              |    9 +++++++--
 include/linux/file.h   |    4 ++++
 include/linux/ptrace.h |    1 +
 kernel/ptrace.c        |   27 +++++++++++++++++++++++++++
 5 files changed, 46 insertions(+), 4 deletions(-)

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