On Tue, Jul 11, 2023 at 09:15:00AM -0700, Sean Christopherson wrote: > On Mon, Jul 10, 2023, Andrew Morton wrote: > > On Sun, 9 Jul 2023 14:32:09 -0700 Zheng Zhang <zheng.zhang@xxxxxxxxxxxxx> wrote: > > > > > Kees, Andrew, and to whom it may concern: > > > > > > Hello! We have found a bug in the Linux kernel version 6.2.0 by syzkaller > > > with our own templates. It also produces a POC. > > > Attached is the report, log, and reproducers generated by syzkaller > > > Please let me know if there is any additional information that I can > > > provide to help debug this issue. > > > Thanks! > > > > Let's cc the kvm mailing list. > > > > Original email is at > > https://lkml.kernel.org/r/CAC_GQSr3xzZaeZt85k_RCBd5kfiOve8qXo7a81Cq53LuVQ5r=Q@xxxxxxxxxxxxxx > > Yeaaaah. We failed kernel programming 101. KVM installs file descriptors to > let userspace read VM and vCPU stats, but doesn't grab a reference to the VM to > ensure the VM and its vCPUs are kept alive until the stats fds are closed. I'll > send a patch. Thanks! Another victory for hardened usercopy. :) -- Kees Cook
