For that we need to set NLM_F_DUMP. Currently here are no
filters. Any suggestions are welcome.
I think we can add request for children, threads, session or group
members.
Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
---
kernel/taskdiag.c | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
diff --git a/kernel/taskdiag.c b/kernel/taskdiag.c
index 5faf3f0..da4a51b 100644
--- a/kernel/taskdiag.c
+++ b/kernel/taskdiag.c
@@ -102,6 +102,46 @@ err:
return err;
}
+static int taskdiag_dumpid(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct pid_namespace *ns = task_active_pid_ns(current);
+ struct tgid_iter iter;
+ struct nlattr *na;
+ struct task_diag_pid *req;
+ int rc;
+
+ if (nlmsg_len(cb->nlh) < GENL_HDRLEN + sizeof(*req))
+ return -EINVAL;
+
+ na = nlmsg_data(cb->nlh) + GENL_HDRLEN;
+ if (na->nla_type < 0)
+ return -EINVAL;
+
+ req = (struct task_diag_pid *) nla_data(na);
+
+ iter.tgid = cb->args[0];
+ iter.task = NULL;
+ for (iter = next_tgid(ns, iter);
+ iter.task;
+ iter.tgid += 1, iter = next_tgid(ns, iter)) {
+ if (!ptrace_may_access(iter.task, PTRACE_MODE_READ))
+ continue;
+
+ rc = task_diag_fill(iter.task, skb, req->show_flags,
+ NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq);
+ if (rc < 0) {
+ put_task_struct(iter.task);
+ if (rc != -EMSGSIZE)
+ return rc;
+ break;
+ }
+ }
+
+ cb->args[0] = iter.tgid;
+
+ return skb->len;
+}
+
static int taskdiag_doit(struct sk_buff *skb, struct genl_info *info)
{
struct task_struct *tsk = NULL;
@@ -161,6 +201,7 @@ static const struct genl_ops taskdiag_ops[] = {
{
.cmd = TASKDIAG_CMD_GET,
.doit = taskdiag_doit,
+ .dumpit = taskdiag_dumpid,
.policy = taskstats_cmd_get_policy,
},
};
--
2.1.0
--
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