diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2014-12-06 04:36:04 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-08 21:27:48 +0300 |
commit | dbe76d177d57138416749b31d9612e2613f2a227 (patch) | |
tree | bcae5d1aa3b9e1faf34775ba930bc250221faae8 | |
parent | 1cc018fe983078024b9c8fdc5a0fa788a8d75efb (diff) | |
download | linux-dbe76d177d57138416749b31d9612e2613f2a227.tar.xz |
userns: Allow setting gid_maps without privilege when setgroups is disabled
commit 66d2f338ee4c449396b6f99f5e75cd18eb6df272 upstream.
Now that setgroups can be disabled and not reenabled, setting gid_map
without privielge can now be enabled when setgroups is disabled.
This restores most of the functionality that was lost when unprivileged
setting of gid_map was removed. Applications that use this functionality
will need to check to see if they use setgroups or init_groups, and if they
don't they can be fixed by simply disabling setgroups before writing to
gid_map.
Reviewed-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | kernel/user_namespace.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c index 6e80f4c1322b..a2e37c5d2f63 100644 --- a/kernel/user_namespace.c +++ b/kernel/user_namespace.c @@ -826,6 +826,11 @@ static bool new_idmap_permitted(const struct file *file, kuid_t uid = make_kuid(ns->parent, id); if (uid_eq(uid, cred->euid)) return true; + } else if (cap_setid == CAP_SETGID) { + kgid_t gid = make_kgid(ns->parent, id); + if (!(ns->flags & USERNS_SETGROUPS_ALLOWED) && + gid_eq(gid, cred->egid)) + return true; } } |