userns: Allow PR_CAPBSET_DROP in a user namespace.
As the capabilites and capability bounding set are per user namespace
properties it is safe to allow changing them with just CAP_SETPCAP
permission in the user namespace.
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Tested-by: Richard Weinberger <richard@nod.at>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
diff --git a/security/commoncap.c b/security/commoncap.c
index c44b6fe..9fccf71 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -824,7 +824,7 @@
*/
static long cap_prctl_drop(struct cred *new, unsigned long cap)
{
- if (!capable(CAP_SETPCAP))
+ if (!ns_capable(current_user_ns(), CAP_SETPCAP))
return -EPERM;
if (!cap_valid(cap))
return -EINVAL;