kernel: Only expose su when daemon is running

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / namei.c

diff --git a/fs/namei.c b/fs/namei.c
index c87e15ee925594ce75ef3ae3b1c62dd789cae1e8..36d4b29459ecb52a713c1cc3565e426a36e43c77 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2009,6 +2009,14 @@ static int path_lookupat(int dfd, const char *name,
                }
        }
 
+       if (!err) {
+               struct super_block *sb = nd->inode->i_sb;
+               if (sb->s_flags & MS_RDONLY) {
+                       if (d_is_su(nd->path.dentry) && !su_visible())
+                               err = -ENOENT;
+               }
+       }
+
        if (base)
                fput(base);