Merge branch 'work.mqueue' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

[linux-2.6-microblaze.git] / kernel / bpf / inode.c

diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c
index 2b75fac..81e2f69 100644 (file)
--- a/kernel/bpf/inode.c
+++ b/kernel/bpf/inode.c
@@ -362,7 +362,45 @@ out:
        putname(pname);
        return ret;
 }
-EXPORT_SYMBOL_GPL(bpf_obj_get_user);
+
+static struct bpf_prog *__get_prog_inode(struct inode *inode, enum bpf_prog_type type)
+{
+       struct bpf_prog *prog;
+       int ret = inode_permission(inode, MAY_READ | MAY_WRITE);
+       if (ret)
+               return ERR_PTR(ret);
+
+       if (inode->i_op == &bpf_map_iops)
+               return ERR_PTR(-EINVAL);
+       if (inode->i_op != &bpf_prog_iops)
+               return ERR_PTR(-EACCES);
+
+       prog = inode->i_private;
+
+       ret = security_bpf_prog(prog);
+       if (ret < 0)
+               return ERR_PTR(ret);
+
+       if (!bpf_prog_get_ok(prog, &type, false))
+               return ERR_PTR(-EINVAL);
+
+       return bpf_prog_inc(prog);
+}
+
+struct bpf_prog *bpf_prog_get_type_path(const char *name, enum bpf_prog_type type)
+{
+       struct bpf_prog *prog;
+       struct path path;
+       int ret = kern_path(name, LOOKUP_FOLLOW, &path);
+       if (ret)
+               return ERR_PTR(ret);
+       prog = __get_prog_inode(d_backing_inode(path.dentry), type);
+       if (!IS_ERR(prog))
+               touch_atime(&path);
+       path_put(&path);
+       return prog;
+}
+EXPORT_SYMBOL(bpf_prog_get_type_path);
 
 static void bpf_evict_inode(struct inode *inode)
 {