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userns: When the per user per user namespace limit is reached return ENOSPC

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The current error codes returned when a the per user per user
namespace limit are hit (EINVAL, EUSERS, and ENFILE) are wrong.  I
asked for advice on linux-api and it we made clear that those were
the wrong error code, but a correct effor code was not suggested.

The best general error code I have found for hitting a resource limit
is ENOSPC.  It is not perfect but as it is unambiguous it will serve
until someone comes up with a better error code.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2016-09-22 13:08:36 -05:00
parent 9c722e406a
commit df75e7748b
7 changed files with 7 additions and 7 deletions
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2
kernel/cgroup.c
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@ -6354,7 +6354,7 @@ struct cgroup_namespace *copy_cgroup_ns(unsigned long flags,
ucounts = inc_cgroup_namespaces(user_ns);
if (!ucounts)
return ERR_PTR(-ENFILE);
return ERR_PTR(-ENOSPC);
/* It is not safe to take cgroup_mutex here */
spin_lock_irq(&css_set_lock);