sysctl: check for bogus modes

Catch, e. g., 644/0644 typo.

Signed-off-by: Alexey Dobriyan <adobriyan@parallels.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/sysctl_check.c b/kernel/sysctl_check.c
index c09350d564f2c4d3baa5b1510ed0d42aeabdc6ba..c35da23ab8fb025f0fd0a03b54f90df3fe246cad 100644 (file)
--- a/kernel/sysctl_check.c
+++ b/kernel/sysctl_check.c
@@ -1532,6 +1532,8 @@ int sysctl_check_table(struct nsproxy *namespaces, struct ctl_table *table)
                        sysctl_check_leaf(namespaces, table, &fail);
                }
                sysctl_check_bin_path(table, &fail);
+               if (table->mode > 0777)
+                       set_fail(&fail, table, "bogus .mode");
                if (fail) {
                        set_fail(&fail, table, NULL);
                        error = -EINVAL;