On Wed, Nov 2, 2022 at 3:27 PM Alexander Potapenko wrote:
>
> On Fri, Oct 28, 2022 at 6:14 PM Luck, Tony wrote:
> >
> > >> +vfrom = kmap_local_page(from);
> > >> +vto = kmap_local_page(to);
> > >> +ret = copy_mc_to_kernel(vto, vfrom, PAGE_SIZE);
> > >
> > > In copy_user_highpage(), km
On Fri, Oct 28, 2022 at 6:14 PM Luck, Tony wrote:
>
> >> +vfrom = kmap_local_page(from);
> >> +vto = kmap_local_page(to);
> >> +ret = copy_mc_to_kernel(vto, vfrom, PAGE_SIZE);
> >
> > In copy_user_highpage(), kmsan_unpoison_memory(page_address(to), PAGE_SIZE)
> > is done after the cop
>> +vfrom = kmap_local_page(from);
>> +vto = kmap_local_page(to);
>> +ret = copy_mc_to_kernel(vto, vfrom, PAGE_SIZE);
>
> In copy_user_highpage(), kmsan_unpoison_memory(page_address(to), PAGE_SIZE)
> is done after the copy when
> __HAVE_ARCH_COPY_USER_HIGHPAGE isn't defined. Do we need
On 2022/10/22 4:01, Tony Luck wrote:
> If the kernel is copying a page as the result of a copy-on-write
> fault and runs into an uncorrectable error, Linux will crash because
> it does not have recovery code for this case where poison is consumed
> by the kernel.
>
> It is easy to set up a test ca
On Fri, Oct 21, 2022 at 01:01:19PM -0700, Tony Luck wrote:
> If the kernel is copying a page as the result of a copy-on-write
> fault and runs into an uncorrectable error, Linux will crash because
> it does not have recovery code for this case where poison is consumed
> by the kernel.
>
> It is ea
If the kernel is copying a page as the result of a copy-on-write
fault and runs into an uncorrectable error, Linux will crash because
it does not have recovery code for this case where poison is consumed
by the kernel.
It is easy to set up a test case. Just inject an error into a private
page, for
