Messages in this thread | | | Date | Sat, 23 Feb 2019 19:44:21 -0500 | From | Steven Rostedt <> | Subject | Re: [PATCH 1/2 v2] kprobe: Do not use uaccess functions to access kernel memory that can fault |
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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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