sysctl: Fix out of bounds access for empty sysctl registers

[ Upstream commit 315552310c7de92baea4e570967066569937a843 ]

When registering tables to the sysctl subsystem there is a check to see
if header is a permanently empty directory (used for mounts). This check
evaluates the first element of the ctl_table. This results in an out of
bounds evaluation when registering empty directories.

The function register_sysctl_mount_point now passes a ctl_table of size
1 instead of size 0. It now relies solely on the type to identify
a permanently empty register.

Make sure that the ctl_table has at least one element before testing for
permanent emptiness.

Signed-off-by: Joel Granados <j.granados@samsung.com>
Reported-by: kernel test robot <oliver.sang@intel.com>
Closes: https://lore.kernel.org/oe-lkp/202311201431.57aae8f3-oliver.sang@intel.com
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c
index de48419..5b5cdc7 100644 (file)
--- a/fs/proc/proc_sysctl.c
+++ b/fs/proc/proc_sysctl.c
@@ -44,7 +44,7 @@ static struct ctl_table sysctl_mount_point[] = {
  */
 struct ctl_table_header *register_sysctl_mount_point(const char *path)
 {
-       return register_sysctl_sz(path, sysctl_mount_point, 0);
+       return register_sysctl(path, sysctl_mount_point);
 }
 EXPORT_SYMBOL(register_sysctl_mount_point);
 
@@ -233,7 +233,8 @@ static int insert_header(struct ctl_dir *dir, struct ctl_table_header *header)
                return -EROFS;
 
        /* Am I creating a permanently empty directory? */
-       if (sysctl_is_perm_empty_ctl_table(header->ctl_table)) {
+       if (header->ctl_table_size > 0 &&
+           sysctl_is_perm_empty_ctl_table(header->ctl_table)) {
                if (!RB_EMPTY_ROOT(&dir->root))
                        return -EINVAL;
                sysctl_set_perm_empty_ctl_header(dir_h);
@@ -1213,6 +1214,10 @@ static bool get_links(struct ctl_dir *dir,
        struct ctl_table_header *tmp_head;
        struct ctl_table *entry, *link;
 
+       if (header->ctl_table_size == 0 ||
+           sysctl_is_perm_empty_ctl_table(header->ctl_table))
+               return true;
+
        /* Are there links available for every entry in table? */
        list_for_each_table_entry(entry, header) {
                const char *procname = entry->procname;