[PATCH RFC 14/41] debugfs: use fc_init_pseudo()

[Christian Brauner <brauner@xxxxxxxxxx>]

Initialize debugfs as a pseudo filesystem. This raises SB_I_PSEUDO and
also SB_I_NOEXEC and SB_I_NODEV. debugfs never holds executables or
device nodes.

SB_I_NOEXEC also refuses PROT_EXEC mappings. The debugfs files that
can be mapped, kcov, relay channels and powernv's memtrace, map data.

Signed-off-by: Christian Brauner (Amutable) <brauner@xxxxxxxxxx>
---
 fs/debugfs/inode.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index b4915551ad31..f163f0bc5703 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -15,6 +15,7 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/fs_context.h>
+#include <linux/pseudo_fs.h>
 #include <linux/fs_parser.h>
 #include <linux/pagemap.h>
 #include <linux/init.h>
@@ -317,6 +318,7 @@ static int debugfs_init_fs_context(struct fs_context *fc)
        fsi->mode = DEBUGFS_DEFAULT_MODE;
 
        fc->s_fs_info = fsi;
+       fc_init_pseudo(fc);
        fc->ops = &debugfs_context_ops;
        return 0;
 }

-- 
2.53.0