On Tue, Apr 25, 2017 at 5:23 AM, Djalal Harouni <tixxdz@xxxxxxxxx> wrote: > If "limit_pids=1" mount option is set then do not instantiate pids that > we can not ptrace. "limit_pids=1" means that procfs should only contain > pids that the caller can ptrace. > > Cc: Kees Cook <keescook@xxxxxxxxxxxx> > Cc: Andy Lutomirski <luto@xxxxxxxxxx> > Signed-off-by: Djalal Harouni <tixxdz@xxxxxxxxx> > --- > fs/proc/base.c | 9 +++++++++ > 1 file changed, 9 insertions(+) > > diff --git a/fs/proc/base.c b/fs/proc/base.c > index 2e0f661..a663284 100644 > --- a/fs/proc/base.c > +++ b/fs/proc/base.c > @@ -3149,6 +3149,7 @@ struct dentry *proc_pid_lookup(struct inode *dir, struct dentry * dentry, unsign > unsigned tgid; > struct proc_fs_info *fs_info = proc_sb(dir->i_sb); > struct pid_namespace *ns = fs_info->pid_ns; > + int limit_pids = proc_fs_limit_pids(fs_info); Shouldn't the addition of proc_fs_limit_pids() be in this patch? Also, can we name it something self-documented? "ptraceable_pids_only=1", perhaps? Or even pids=ptraceable (as opposed to pids=all or maybe other choices in the future)? --Andy
