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authorEric W. Biederman <ebiederm@xmission.com>2016-06-09 15:34:02 -0500
committerEric W. Biederman <ebiederm@xmission.com>2016-06-23 15:41:57 -0500
commita2982cc922c3068783eb9a1f77a5626a1ec36a1f (patch)
tree61ccc6ad01f8804d5290ae4565ba8d4238bf648a /fs/kernfs
parent3ee690143c3c99f6c0e83f08ff17556890bc6027 (diff)
vfs: Generalize filesystem nodev handling.
Introduce a function may_open_dev that tests MNT_NODEV and a new superblock flab SB_I_NODEV. Use this new function in all of the places where MNT_NODEV was previously tested. Add the new SB_I_NODEV s_iflag to proc, sysfs, and mqueuefs as those filesystems should never support device nodes, and a simple superblock flags makes that very hard to get wrong. With SB_I_NODEV set if any device nodes somehow manage to show up on on a filesystem those device nodes will be unopenable. Acked-by: Seth Forshee <seth.forshee@canonical.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/kernfs')
-rw-r--r--fs/kernfs/mount.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index 1443df670260..b3d73ad52b22 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -152,8 +152,8 @@ static int kernfs_fill_super(struct super_block *sb, unsigned long magic)
struct dentry *root;
info->sb = sb;
- /* Userspace would break if executables appear on sysfs */
- sb->s_iflags |= SB_I_NOEXEC;
+ /* Userspace would break if executables or devices appear on sysfs */
+ sb->s_iflags |= SB_I_NOEXEC | SB_I_NODEV;
sb->s_blocksize = PAGE_SIZE;
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = magic;