Cyrill Gorcunov b32dfe3771
c/r: prctl: add ability to set new mm_struct::exe_file ...
When we do restore we would like to have a way to setup a former
mm_struct::exe_file so that /proc/pid/exe would point to the original
executable file a process had at checkpoint time.
For this the PR_SET_MM_EXE_FILE code is introduced. This option takes a
file descriptor which will be set as a source for new /proc/$pid/exe
symlink.
Note it allows to change /proc/$pid/exe if there are no VM_EXECUTABLE
vmas present for current process, simply because this feature is a special
to C/R and mm::num_exe_file_vmas become meaningless after that.
To minimize the amount of transition the /proc/pid/exe symlink might have,
this feature is implemented in one-shot manner. Thus once changed the
symlink can't be changed again. This should help sysadmins to monitor the
symlinks over all process running in a system.
In particular one could make a snapshot of processes and ring alarm if
there unexpected changes of /proc/pid/exe's in a system.
Note -- this feature is available iif CONFIG_CHECKPOINT_RESTORE is set and
the caller must have CAP_SYS_RESOURCE capability granted, otherwise the
request to change symlink will be rejected.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org >
Reviewed-by: Oleg Nesterov <oleg@redhat.com >
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com >
Cc: Pavel Emelyanov <xemul@parallels.com >
Cc: Kees Cook <keescook@chromium.org >
Cc: Tejun Heo <tj@kernel.org >
Cc: Matt Helsley <matthltc@us.ibm.com >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
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