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SubjectRe: [Y2038] [PATCH v7 6/9] ALSA: Avoid using timespec for struct snd_timer_tread
On Thu, Dec 12, 2019 at 1:14 AM Ben Hutchings
<ben.hutchings@codethink.co.uk> wrote:
>
> On Wed, 2019-12-11 at 22:20 +0100, Arnd Bergmann wrote:
> [...]
> > +static int snd_timer_user_tread(void __user *argp, struct snd_timer_user *tu,
> > + unsigned int cmd, bool compat)
> > +{
> > + int __user *p = argp;
> > + int xarg, old_tread;
> > +
> > + if (tu->timeri) /* too late */
> > + return -EBUSY;
> > + if (get_user(xarg, p))
> > + return -EFAULT;
> > +
> > + old_tread = tu->tread;
> > +
> > + if (!xarg)
> > + tu->tread = TREAD_FORMAT_NONE;
> > + else if (cmd == SNDRV_TIMER_IOCTL_TREAD64 ||
> > + (IS_ENABLED(CONFIG_64BITS) && !compat))
>
> This needs to check for CONFIG_64BIT not CONFIG_64BITS.

Fixed now, good catch!

> > @@ -2145,14 +2202,34 @@ static ssize_t snd_timer_user_read(struct file *file, char __user *buffer,
> > + case TREAD_FORMAT_NONE:
> > if (copy_to_user(buffer, &tu->queue[qhead],
> > sizeof(struct snd_timer_read)))
> > err = -EFAULT;
> > + break;
> > + default:
> > + err = -ENOTSUPP;
> [...]
>
> This is not a valid error code for returning to user-space, but this
> case should be impossible so I don't think it matters.

Agreed. Maybe it should also WARN_ON(1), as there getting here
would indicate a bug in the kernel.

Arnd

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