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authorEric W. Biederman <ebiederm@xmission.com>2014-12-05 19:36:04 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-08 10:00:50 -0800
commita7785a8cf8734468cd46c65c8c10b0aeb13ff5b0 (patch)
tree9f7908beb61e2f178b8c96095be6d5879384c11d
parentcbc4266efecca3fc3d078d9a28465757b6f629ec (diff)
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.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index efa69769d79c..153971e4798a 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -818,6 +818,11 @@ 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;
}
}