On Wed, Feb 23, 2022 at 04:44:07PM -0800, John Hubbard wrote: > > Actually...I can confirm that real customers really are doing *exactly* > that! Despite the kernel crashes--because the crashes don't always > happen unless you have a large (supercomputer-sized) installation. And > even then it is not always root-caused properly. Interesting. The syzbot reproducer triggers *reliably* on ext4 using a 2 CPU qemu kernel running on a laptop, and it doesn't require root, so it's reasonable that Lee is pushing for a fix --- even if for the Android O or newer, Seccomp can probably prohibit trap process_vm_writev(2), but it seems unfortunate if say, someone running a Docker container could take down the entire host OS. - Ted
