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-rw-r--r--kernel/user_namespace.c27
1 files changed, 22 insertions, 5 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 6b2e3ca7ee99..54211dbd516c 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -9,6 +9,7 @@
#include <linux/highuid.h>
#include <linux/cred.h>
#include <linux/securebits.h>
+#include <linux/security.h>
#include <linux/keyctl.h>
#include <linux/key-type.h>
#include <keys/user-type.h>
@@ -58,6 +59,18 @@ static void set_cred_user_ns(struct cred *cred, struct user_namespace *user_ns)
cred->user_ns = user_ns;
}
+static unsigned long enforced_nproc_rlimit(void)
+{
+ unsigned long limit = RLIM_INFINITY;
+
+ /* Is RLIMIT_NPROC currently enforced? */
+ if (!uid_eq(current_uid(), GLOBAL_ROOT_UID) ||
+ (current_user_ns() != &init_user_ns))
+ limit = rlimit(RLIMIT_NPROC);
+
+ return limit;
+}
+
/*
* Create a new user namespace, deriving the creator from the user in the
* passed credentials, and replacing that user with the new root user for the
@@ -101,6 +114,10 @@ int create_user_ns(struct cred *new)
!kgid_has_mapping(parent_ns, group))
goto fail_dec;
+ ret = security_create_user_ns(new);
+ if (ret < 0)
+ goto fail_dec;
+
ret = -ENOMEM;
ns = kmem_cache_zalloc(user_ns_cachep, GFP_KERNEL);
if (!ns)
@@ -119,13 +136,13 @@ int create_user_ns(struct cred *new)
ns->owner = owner;
ns->group = group;
INIT_WORK(&ns->work, free_user_ns);
- for (i = 0; i < MAX_PER_NAMESPACE_UCOUNTS; i++) {
+ for (i = 0; i < UCOUNT_COUNTS; i++) {
ns->ucount_max[i] = INT_MAX;
}
- set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_NPROC, rlimit(RLIMIT_NPROC));
- set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_MSGQUEUE, rlimit(RLIMIT_MSGQUEUE));
- set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_SIGPENDING, rlimit(RLIMIT_SIGPENDING));
- set_rlimit_ucount_max(ns, UCOUNT_RLIMIT_MEMLOCK, rlimit(RLIMIT_MEMLOCK));
+ set_userns_rlimit_max(ns, UCOUNT_RLIMIT_NPROC, enforced_nproc_rlimit());
+ set_userns_rlimit_max(ns, UCOUNT_RLIMIT_MSGQUEUE, rlimit(RLIMIT_MSGQUEUE));
+ set_userns_rlimit_max(ns, UCOUNT_RLIMIT_SIGPENDING, rlimit(RLIMIT_SIGPENDING));
+ set_userns_rlimit_max(ns, UCOUNT_RLIMIT_MEMLOCK, rlimit(RLIMIT_MEMLOCK));
ns->ucounts = ucounts;
/* Inherit USERNS_SETGROUPS_ALLOWED from our parent */