diff options
| -rw-r--r-- | kernel/params.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/params.c b/kernel/params.c index 795321aba29..0af9b2c4e56 100644 --- a/kernel/params.c +++ b/kernel/params.c @@ -645,7 +645,9 @@ static __modinit int add_sysfs_param(struct module_kobject *mk, sysfs_attr_init(&mk->mp->attrs[mk->mp->num].mattr.attr); mk->mp->attrs[mk->mp->num].param = kp; mk->mp->attrs[mk->mp->num].mattr.show = param_attr_show; - mk->mp->attrs[mk->mp->num].mattr.store = param_attr_store; + /* Do not allow runtime DAC changes to make param writable. */ + if ((kp->perm & (S_IWUSR | S_IWGRP | S_IWOTH)) != 0) + mk->mp->attrs[mk->mp->num].mattr.store = param_attr_store; mk->mp->attrs[mk->mp->num].mattr.attr.name = (char *)name; mk->mp->attrs[mk->mp->num].mattr.attr.mode = kp->perm; mk->mp->num++; |