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userns: Kill nsown_capable it makes the wrong thing easy

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nsown_capable is a special case of ns_capable essentially for just CAP_SETUID and
CAP_SETGID.  For the existing users it doesn't noticably simplify things and
from the suggested patches I have seen it encourages people to do the wrong
thing.  So remove nsown_capable.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2013-03-20 12:49:49 -07:00
parent f54fb863c6
commit c7b96acf14
12 changed files with 21 additions and 34 deletions
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2
kernel/utsname.c
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@ -114,7 +114,7 @@ static int utsns_install(struct nsproxy *nsproxy, void *new)
struct uts_namespace *ns = new;
if (!ns_capable(ns->user_ns, CAP_SYS_ADMIN) ||
!nsown_capable(CAP_SYS_ADMIN))
!ns_capable(current_user_ns(), CAP_SYS_ADMIN))
return -EPERM;
get_uts_ns(ns);