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sysctl: Allow creating permanently empty directories that serve as mountpoints.

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Add a magic sysctl table sysctl_mount_point that when used to
create a directory forces that directory to be permanently empty.

Update the code to use make_empty_dir_inode when accessing permanently
empty directories.

Update the code to not allow adding to permanently empty directories.

Update /proc/sys/fs/binfmt_misc to be a permanently empty directory.

Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman
2015-05-09 22:09:14 -05:00
parent fbabfd0f4e
commit f9bd6733d3
3 changed files with 41 additions and 7 deletions
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8
kernel/sysctl.c
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@@ -1531,12 +1531,6 @@ static struct ctl_table vm_table[] = {
{ }
};
#if defined(CONFIG_BINFMT_MISC) || defined(CONFIG_BINFMT_MISC_MODULE)
static struct ctl_table binfmt_misc_table[] = {
{ }
};
#endif
static struct ctl_table fs_table[] = {
{
.procname = "inode-nr",
@@ -1690,7 +1684,7 @@ static struct ctl_table fs_table[] = {
{
.procname = "binfmt_misc",
.mode = 0555,
.child = binfmt_misc_table,
.child = sysctl_mount_point,
},
#endif
{