On Thu, 9 Nov 2017, Djalal Harouni wrote: > This patch introduces the new 'pids' mount option, as it was discussed > and suggested by Andy Lutomirski [1]. > > * If 'pids=' is passed without 'newinstance' then it has no effect. > > * If 'newinstance,pids=all' then all processes will be shown in proc. > > * If 'newinstance,pids=ptraceable' then only ptraceable processes will be > shown. > > * 'pids=' takes precendence over 'hidepid=' since 'hidepid=' can be > ignored if "gid=" was set and caller has the "gid=" set in its groups. > We want to guarantee that LSM have a security path there that can not > be disabled with "gid=". > > This allows to support lightweight sandboxes in Embedded Linux. > > Later Yama LSM can be updated to check that processes are able only > able to see their children inside /proc/, allowing to support more tight > cases. > > [1] https://lkml.org/lkml/2017/4/26/646 > > Cc: Kees Cook <keescook@xxxxxxxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Suggested-by: Andy Lutomirski <luto@xxxxxxxxxx> > Signed-off-by: Alexey Gladkov <gladkov.alexey@xxxxxxxxx> > Signed-off-by: Djalal Harouni <tixxdz@xxxxxxxxx> Reviewed-by: James Morris <james.l.morris@xxxxxxxxxx> -- James Morris <james.l.morris@xxxxxxxxxx>
