[PATCH v3 3/3] arm64: kprobe: disable probe of fault prone ptrauth instruction

Amit Daniel Kachhap amit.kachhap at arm.com
Tue Jun 23 09:18:03 EDT 2020

On 6/22/20 11:16 PM, Mark Rutland wrote:
> On Mon, Jun 22, 2020 at 06:13:46PM +0100, Mark Brown wrote:
>> On Mon, Jun 22, 2020 at 05:57:49PM +0100, Mark Rutland wrote:
>>> On Mon, Jun 22, 2020 at 03:40:26PM +0100, Dave Martin wrote:
>>>> On Thu, Jun 18, 2020 at 10:40:29AM +0530, Amit Daniel Kachhap wrote:
>>>>> -		 * The HINT instruction is is problematic when single-stepping,
>>>>> +		 * The HINT instruction is problematic when single-stepping,
>>>> Nit: doesn't matter too much, but ideally this should be a separate
>>>> patch (or just don't bother).
>>> Agreed. I also think if we change this at all we should drop the comment
>>> entirely: it's somewhat misleading given it implies NOP is the only HINT
>>> space instruction that can be sfely stepped, and doesn't suggest *why*
>>> hints might be proboematic.
>> Given the rename of _is_nop() to _is_steppable_hint() we should probably
>> push an explanation to _is_steppable_hint() rather than having something
>> here but I do think it's worth having something more than just the plain
>> code.  I do agree that the current comment really doesn't say much
>> though.
> That's fair. It's clearly material for a separate patch, regardless!
> Mark.

ok sure. I will add a comment here in a separate patch.



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