On Thu, May 12, 2016 at 10:18:47AM -0700, Dennis Dalessandro wrote:
> + case HFI1_IOCTL_EP_INFO:
> + case HFI1_IOCTL_EP_ERASE_CHIP:
> + case HFI1_IOCTL_EP_ERASE_RANGE:
> + case HFI1_IOCTL_EP_READ_RANGE:
> + case HFI1_IOCTL_EP_WRITE_RANGE:
> + if (!capable(CAP_SYS_ADMIN))
> + return -EPERM;
> + if (copy_from_user(&ucmd,
> + (struct hfi11_cmd __user *)arg,
> + sizeof(ucmd)))
> + return -EFAULT;
> + return handle_eprom_command(fp, &ucmd);
I thought we agreed to get rid of this as well? It certainly does not
belong here, and as a general rule, I don't think ioctls should be
doing capable tests..
> +static inline int check_ioctl_access(unsigned int cmd, unsigned long arg)
> +{
> + int read_cmd, write_cmd, read_ok, write_ok;
> +
> + read_cmd = _IOC_DIR(cmd) & _IOC_READ;
> + write_cmd = _IOC_DIR(cmd) & _IOC_WRITE;
> + write_ok = access_ok(VERIFY_WRITE, (void __user *)arg, _IOC_SIZE(cmd));
> + read_ok = access_ok(VERIFY_READ, (void __user *)arg, _IOC_SIZE(cmd));
> +
> + if ((read_cmd && !write_ok) || (write_cmd && !read_ok))
> + return -EFAULT;
This seems kind of goofy, didn't Ira say this is performance senstive?
Driver shouldn't be open coding __get_user like that, IMHO.
> +#define HFI1_IOCTL_RECV_CTRL \
> + _IOW(IB_IOCTL_MAGIC, HFI1_CMD_RECV_CTRL, int)
Have you audited this? Confused why this is marked IOW when I see
this:
+ case HFI1_IOCTL_RECV_CTRL:
+ ret = __get_user(uval, (int __user *)arg);
Seeing many other examples.
I stopped looking again
Jason
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