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authorEric W. Biederman <ebiederm@xmission.com>2015-05-09 22:09:14 -0500
committerEric W. Biederman <ebiederm@xmission.com>2015-07-01 10:36:39 -0500
commitf9bd6733d3f11e24f3949becf277507d422ee1eb (patch)
tree79d33823e26cb5be0af93bae37b2abca3fdaa5dc /kernel/sysctl.c
parentfbabfd0f4ee2e8847bf56edf481249ad1bb8c44d (diff)
downloadlinux-sh-f9bd6733d3f11e24f3949becf277507d422ee1eb.tar.gz
sysctl: Allow creating permanently empty directories that serve as mountpoints.
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>
Diffstat (limited to 'kernel/sysctl.c')
-rw-r--r--kernel/sysctl.c8
1 files changed, 1 insertions, 7 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2082b1a88fb9..c3eee4c6d6c1 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -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
{