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authorEric W. Biederman <ebiederm@xmission.com>2014-12-05 17:19:27 -0600
committerEric W. Biederman <ebiederm@xmission.com>2014-12-05 17:19:27 -0600
commit7ff4d90b4c24a03666f296c3d4878cd39001e81e (patch)
tree757293c98c93eec1c5b7caae149c34e49bb824c5 /kernel/groups.c
parent4fed655c410cc56add64c7b1f7c85c7c56066ac2 (diff)
downloadlinux-7ff4d90b4c24a03666f296c3d4878cd39001e81e.tar.bz2
groups: Consolidate the setgroups permission checks
Today there are 3 instances of setgroups and due to an oversight their permission checking has diverged. Add a common function so that they may all share the same permission checking code. This corrects the current oversight in the current permission checks and adds a helper to avoid this in the future. A user namespace security fix will update this new helper, shortly. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/groups.c')
-rw-r--r--kernel/groups.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/kernel/groups.c b/kernel/groups.c
index 451698f86cfa..02d8a251c476 100644
--- a/kernel/groups.c
+++ b/kernel/groups.c
@@ -213,6 +213,13 @@ out:
return i;
}
+bool may_setgroups(void)
+{
+ struct user_namespace *user_ns = current_user_ns();
+
+ return ns_capable(user_ns, CAP_SETGID);
+}
+
/*
* SMP: Our groups are copy-on-write. We can set them safely
* without another task interfering.
@@ -223,7 +230,7 @@ SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
struct group_info *group_info;
int retval;
- if (!ns_capable(current_user_ns(), CAP_SETGID))
+ if (!may_setgroups())
return -EPERM;
if ((unsigned)gidsetsize > NGROUPS_MAX)
return -EINVAL;