Re: [Linux Kernel Bug][mm/gup] 3 Warning Crashes: kmalloc bug in gup_test_ioctl, is_valid_gup_args, pin_user_pages_fast

[Matthew Wilcox]

On Fri, Jan 26, 2024 at 11:04:53AM -0600, Chenyuan Yang wrote:
> Dear Developers for Linux Memory Management,
> 
> We encountered 3 warning crashes when testing the memory management
> with Syzkaller and our generated specifications:

These all come in through gup_test_ioctl().  It's my impression
that this is something you can enable to wreak havoc on your kernel
and it's not something which should ever be exposed to fuzzers.