[Bug 216073] [s390x] kernel BUG at mm/usercopy.c:101! usercopy: Kernel memory exposure attempt detected from vmalloc 'n o area' (offset 0, size 1)!

bugzilla-daemon
2022-06-12T18:44:54Z

--- Comment #16 from yuzhao@google.com ---
On Sun, Jun 12, 2022 at 12:05 PM Matthew Wilcox <willy@infradead.org> wrote:
>
> On Sun, Jun 12, 2022 at 11:59:58AM -0600, Yu Zhao wrote:
> > Please let me know if there is something we want to test -- I can
> > reproduce the problem reliably:
> >
> > ------------[ cut here ]------------
> > kernel BUG at mm/usercopy.c:101!
>
> The line right before cut here would have been nice ;-)

Right.

$ grep usercopy:
usercopy: Kernel memory exposure attempt detected from vmalloc (offset
2882303761517129920, size 11)!
usercopy: Kernel memory exposure attempt detected from vmalloc (offset
8574853690513436864, size 11)!
usercopy: Kernel memory exposure attempt detected from vmalloc (offset
7998392938210013376, size 11)!
...

> https://lore.kernel.org/linux-mm/YqXU+oU7wayOcmCe@casper.infradead.org/
>
> might fix your problem, but I can't be sure without that line.

Thanks, it worked!