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vfs: Generalize filesystem nodev handling.

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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 <[email protected]>
Signed-off-by: "Eric W. Biederman" <[email protected]>
This commit is contained in:
Eric W. Biederman 2016-06-09 15:34:02 -05:00
commit a2982cc922
6 changed files with 15 additions and 7 deletions
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4
fs/kernfs/mount.c
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@ -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;