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On 7/22/20 11:09 PM, Christoph Hellwig wrote:
> Rework the remaining setsockopt code to pass a sockptr_t instead of a
> plain user pointer. This removes the last remaining set_fs(KERNEL_DS)
> outside of architecture specific code.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> Acked-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx> [ieee802154]
> ---
...
> diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
> index 594e01ad670aa6..874f01cd7aec42 100644
> --- a/net/ipv6/raw.c
> +++ b/net/ipv6/raw.c
> @@ -972,13 +972,13 @@ static int rawv6_sendmsg(struct sock *sk, struct msghdr
> *msg, size_t len)
> }
>
...
> static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
> - char __user *optval, unsigned int optlen)
> + sockptr_t optval, unsigned int optlen)
> {
> struct raw6_sock *rp = raw6_sk(sk);
> int val;
>
> - if (get_user(val, (int __user *)optval))
> + if (copy_from_sockptr(&val, optval, sizeof(val)))
> return -EFAULT;
>
converting get_user(...) to copy_from_sockptr(...) really assumed the optlen
has been validated to be >= sizeof(int) earlier.
Which is not always the case, for example here.
User application can fool us passing optlen=0, and a user pointer of exactly
TASK_SIZE-1
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