Re: [patch 3/3] x86/vdso: Sanitize vdso*_enabled handling

From: Thomas Gleixner
Date: Mon Apr 10 2017 - 12:25:56 EST


On Mon, 10 Apr 2017, Andy Lutomirski wrote:

> On Mon, Apr 10, 2017 at 8:14 AM, Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:
> > +static int vdso32_sysctl;
> > +
> > +static int vdso_update_handler(struct ctl_table *table, int write,
> > + void __user *buffer, size_t *lenp,
> > + loff_t *ppos)
> > +{
> > + int ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
>
> Using a global for the temporary is gross and mildly racy. I would
> just open-code the conversion. Or, even better, add proc_dobool().

Dammit, thought about it and then got lazy. :(

Thanks,

tglx