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) <[email protected]> --- 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
