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    SubjectRe: [PATCH 1/2 v2] kprobe: Do not use uaccess functions to access kernel memory that can fault
    On Sat, 23 Feb 2019 12:47:46 +0900
    Masami Hiramatsu <mhiramat@kernel.org> 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

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