On 01/28/2014 02:42 PM, Andy Lutomirski wrote:
I just read it. do_trap_no_signal presumably calls fixup_exception
because #UD uses it and #UD needs that handling. (I'm guessing that
there is actually a legitimate use for a kernel fixup on #UD somewhere
-- there's probably something that isn't covered by cpuid.)
There should not be a #BR from the kernel using the fixup mechanism.
IMO if the exception comes from the kernel, it should unconditionally
call die.
Oh. I agree with you, and if a #BR from the kernel it should
unconditionally call die.
if (!user_mode(regs))
die("bounds", regs, error_code);
Thanks,
Qiaowei
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