From 82aceae4f0d42f03d9ad7d1e90389e731153898f Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Mon, 27 Aug 2012 13:32:15 -0700 Subject: [PATCH] debugfs: more tightly restrict default mount mode Since the debugfs is mostly only used by root, make the default mount mode 0700. Most system owners do not need a more permissive value, but they can choose to weaken the restrictions via their fstab. Signed-off-by: Kees Cook Signed-off-by: Greg Kroah-Hartman --- Documentation/filesystems/debugfs.txt | 4 ++-- fs/debugfs/inode.c | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/Documentation/filesystems/debugfs.txt b/Documentation/filesystems/debugfs.txt index 7a34f82..3a863f6 100644 --- a/Documentation/filesystems/debugfs.txt +++ b/Documentation/filesystems/debugfs.txt @@ -15,8 +15,8 @@ Debugfs is typically mounted with a command like: mount -t debugfs none /sys/kernel/debug (Or an equivalent /etc/fstab line). -The debugfs root directory is accessible by anyone by default. To -restrict access to the tree the "uid", "gid" and "mode" mount +The debugfs root directory is accessible only to the root user by +default. To change access to the tree the "uid", "gid" and "mode" mount options can be used. Note that the debugfs API is exported GPL-only to modules. diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 2c9fafb..6393fd6 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -28,7 +28,7 @@ #include #include -#define DEBUGFS_DEFAULT_MODE 0755 +#define DEBUGFS_DEFAULT_MODE 0700 static struct vfsmount *debugfs_mount; static int debugfs_mount_count; -- 2.7.4