c/r: prctl: extend PR_SET_MM to set up more mm_struct entries
authorCyrill Gorcunov <gorcunov@openvz.org>
Thu, 31 May 2012 23:26:45 +0000 (16:26 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 1 Jun 2012 00:49:32 +0000 (17:49 -0700)
commitfe8c7f5cbf91124987106faa3bdf0c8b955c4cf7
tree3ddb0013465d7cd09ef6bc2fab18cb59055a309b
parent5b172087f99189416d5f47fd7ab5e6fb762a9ba3
c/r: prctl: extend PR_SET_MM to set up more mm_struct entries

During checkpoint we dump whole process memory to a file and the dump
includes process stack memory.  But among stack data itself, the stack
carries additional parameters such as command line arguments, environment
data and auxiliary vector.

So when we do restore procedure and once we've restored stack data itself
we need to setup mm_struct::arg_start/end, env_start/end, so restored
process would be able to find command line arguments and environment data
it had at checkpoint time.  The same applies to auxiliary vector.

For this reason additional PR_SET_MM_(ARG_START | ARG_END | ENV_START |
ENV_END | AUXV) codes are introduced.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andrew Vagin <avagin@openvz.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Vasiliy Kulikov <segoon@openwall.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/prctl.h
kernel/sys.c