Thanks for bringing this to my attention. Regarding io_uring: > > io_uring fundamentally doesn't have the same checks. The kernel side > work can be done from an asynchronous kernel thread. That kernel thread > doesn't have a meaningful PKRU value. The register has a value, but > it's not really related to the userspace threads that are sending it > requests. > I asked the question to the io_uring list [1]. io_uring thread will respect PKRU of the user thread, async or not, the behavior is the same as regular syscall. There will be no issue for io_uring, i.e if it decides to add more memory mapping syscalls to supported cmd in future. [1] https://lore.kernel.org/io-uring/CABi2SkUp45HEt7eQ6a47Z7b3LzW=4m3xAakG35os7puCO2dkng@xxxxxxxxxxxxxx/ Thanks. -Jeff
