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SubjectRe: [PATCH v7 2/2] selftests: add tests for pidfd_send_signal()
On Tue, Jan 08, 2019 at 11:54:15AM -0600, Serge E. Hallyn wrote:
> On Tue, Jan 08, 2019 at 10:53:06AM -0700, Tycho Andersen wrote:
> > On Wed, Jan 02, 2019 at 05:16:54PM +0100, Christian Brauner wrote:
> > > + /*
> > > + * Stop the child so we can inspect whether we have
> > > + * recycled pid PID_RECYCLE.
> > > + */
> > > + close(pipe_fds[0]);
> > > + ret = kill(recycled_pid, SIGSTOP);
> > > + close(pipe_fds[1]);
> > > + if (ret) {
> > > + (void)wait_for_pid(recycled_pid);
> > > + _exit(PIDFD_ERROR);
> > > + }
> >
> > Sorry for being late to the party, but I wonder if this whole thing
> > couldn't be simplified with /proc/sys/kenrel/ns_last_pid?
>
> no, bc it's not namespaced :)

Huh? It looks like it is...

static int pid_ns_ctl_handler(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
struct pid_namespace *pid_ns = task_active_pid_ns(current);
struct ctl_table tmp = *table;
int ret, next;

if (write && !ns_capable(pid_ns->user_ns, CAP_SYS_ADMIN))
return -EPERM;

...

Tycho

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