On Sat, 23 Feb 2019 12:47:46 +0900 Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote: > Since kprobes handler runs in IRQ context, we can not use access_ok() in it. > (only on x86 + CONFIG_DEBUG_ATOMIC_SLEEP=y) Is it really IRQ context or exception context? That is, one (interrupts) happen for any task, but exceptions happen because of the software that is executed (like a breakpoint). Although you can have a kprobe trigger in an interrupt handler (where user access wouldn't make sense anyway). But there should be no problem with user access from an exception handler. -- Steve
