Re: [PATCH -tip tracing/kprobes 3/6] kprobes/x86: Fix to add __kprobesto in-kernel fault handing functions

From: Masami Hiramatsu
Date: Sat Aug 29 2009 - 22:48:28 EST

Frederic Weisbecker wrote:
> On Thu, Aug 27, 2009 at 01:23:11PM -0400, Masami Hiramatsu wrote:
>> Add __kprobes to the functions which handles in-kernel fixable page faults.
>> Since kprobes can cause those in-kernel page faults by accessing kprobe data
>> structures, probing those fault functions will cause fault-int3-loop
>> (do_page_fault has already been marked as __kprobes).
> BTW, is it possible to assert a struct kprobe (and its pointer members)
> haven't been allocated through vmalloc() ?

How about calling vmalloc_sync() always before registering kprobes? :-)

Thank you,

Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@xxxxxxxxxx

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