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-rw-r--r--ipc/ipc_sysctl.c37
1 files changed, 35 insertions, 2 deletions
diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
index 8c62e443f78b..01c4a50d22b2 100644
--- a/ipc/ipc_sysctl.c
+++ b/ipc/ipc_sysctl.c
@@ -14,6 +14,7 @@
#include <linux/ipc_namespace.h>
#include <linux/msg.h>
#include <linux/slab.h>
+#include <linux/cred.h>
#include "util.h"
static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
@@ -190,25 +191,57 @@ static int set_is_seen(struct ctl_table_set *set)
return &current->nsproxy->ipc_ns->ipc_set == set;
}
+static void ipc_set_ownership(struct ctl_table_header *head,
+ struct ctl_table *table,
+ kuid_t *uid, kgid_t *gid)
+{
+ struct ipc_namespace *ns =
+ container_of(head->set, struct ipc_namespace, ipc_set);
+
+ kuid_t ns_root_uid = make_kuid(ns->user_ns, 0);
+ kgid_t ns_root_gid = make_kgid(ns->user_ns, 0);
+
+ *uid = uid_valid(ns_root_uid) ? ns_root_uid : GLOBAL_ROOT_UID;
+ *gid = gid_valid(ns_root_gid) ? ns_root_gid : GLOBAL_ROOT_GID;
+}
+
static int ipc_permissions(struct ctl_table_header *head, struct ctl_table *table)
{
int mode = table->mode;
#ifdef CONFIG_CHECKPOINT_RESTORE
- struct ipc_namespace *ns = current->nsproxy->ipc_ns;
+ struct ipc_namespace *ns =
+ container_of(head->set, struct ipc_namespace, ipc_set);
if (((table->data == &ns->ids[IPC_SEM_IDS].next_id) ||
(table->data == &ns->ids[IPC_MSG_IDS].next_id) ||
(table->data == &ns->ids[IPC_SHM_IDS].next_id)) &&
checkpoint_restore_ns_capable(ns->user_ns))
mode = 0666;
+ else
#endif
- return mode;
+ {
+ kuid_t ns_root_uid;
+ kgid_t ns_root_gid;
+
+ ipc_set_ownership(head, table, &ns_root_uid, &ns_root_gid);
+
+ if (uid_eq(current_euid(), ns_root_uid))
+ mode >>= 6;
+
+ else if (in_egroup_p(ns_root_gid))
+ mode >>= 3;
+ }
+
+ mode &= 7;
+
+ return (mode << 6) | (mode << 3) | mode;
}
static struct ctl_table_root set_root = {
.lookup = set_lookup,
.permissions = ipc_permissions,
+ .set_ownership = ipc_set_ownership,
};
bool setup_ipc_sysctls(struct ipc_namespace *ns)