- Only allow asking for events from the initial user and pid namespace,
where we generate the events in.
- Convert kuids and kgids into the initial user namespace to report
them via the process event connector.
Cc: Evgeniy Polyakov <z...@ioremap.net>
Cc: David Miller <da...@davemloft.net>
Acked-by: Serge Hallyn <serge.hal...@canonical.com>
Signed-off-by: Eric W. Biederman <ebied...@xmission.com>
---
drivers/connector/cn_proc.c | 18 ++++++++++++++----
init/Kconfig | 1 -
2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 3e92b7d..fce2000 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -30,6 +30,7 @@
#include <linux/gfp.h>
#include <linux/ptrace.h>
#include <linux/atomic.h>
+#include <linux/pid_namespace.h>
#include <asm/unaligned.h>
@@ -127,11 +128,11 @@ void proc_id_connector(struct task_struct *task, int
which_id)
rcu_read_lock();
cred = __task_cred(task);
if (which_id == PROC_EVENT_UID) {
- ev->event_data.id.r.ruid = cred->uid;
- ev->event_data.id.e.euid = cred->euid;
+ ev->event_data.id.r.ruid = from_kuid_munged(&init_user_ns,
cred->uid);
+ ev->event_data.id.e.euid = from_kuid_munged(&init_user_ns,
cred->euid);
} else if (which_id == PROC_EVENT_GID) {
- ev->event_data.id.r.rgid = cred->gid;
- ev->event_data.id.e.egid = cred->egid;
+ ev->event_data.id.r.rgid = from_kgid_munged(&init_user_ns,
cred->gid);
+ ev->event_data.id.e.egid = from_kgid_munged(&init_user_ns,
cred->egid);
} else {
rcu_read_unlock();
return;
@@ -303,6 +304,15 @@ static void cn_proc_mcast_ctl(struct cn_msg *msg,
if (msg->len != sizeof(*mc_op))
return;
+ /*
+ * Events are reported with respect to the initial pid
+ * and user namespaces so ignore requestors from
+ * other namespaces.
+ */
+ if ((current_user_ns() != &init_user_ns) ||
+ (task_active_pid_ns(current) != &init_pid_ns))
+ return;
+
mc_op = (enum proc_cn_mcast_op *)msg->data;
switch (*mc_op) {
case PROC_CN_MCAST_LISTEN:
diff --git a/init/Kconfig b/init/Kconfig
index 6c9d004..7327869 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -932,7 +932,6 @@ config UIDGID_CONVERTED
depends on QUOTA = n
depends on QUOTACTL = n
depends on DRM = n
- depends on PROC_EVENTS = n
# Networking
depends on NET_9P = n
--
1.7.5.4
--
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