On Wed, Jan 17, 2018 at 04:27:21AM +0000, Al Viro wrote:
> On Tue, Jan 16, 2018 at 07:41:24PM -0500, Jeff Moyer wrote:
> > if (sigmask) {
> > - if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
> > + if (!access_ok(VERIFY_READ, sigmask,
> > + sizeof(void *) + sizeof(size_t)) ||
> > + __get_user(up, (sigset_t __user * __user *)sigmask) ||
> > + __get_user(sigsetsize,
> > + (size_t __user *)(sigmask + sizeof(void *))))
> > return -EFAULT;
>
> How about copy_from_user() on a struct? Making eyes bleed is fun, but
> people tend to get annoyed when you do it to them...
Above is the copy & paste version from pselect. I've got both copy_from_user
and that horrible version in my tree, and if we really need this awfull
calling convention copy_from_user certainly is much better. pselect
also should be switched to explicit struct + copy_from_user while
we're at it. In fact glibc defines a struct for the userland version
to start with.
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