Re: [PATCH 08/10] x86, pkeys: default to a restrictive init PKRU
From: Andy Lutomirski
Date: Fri Jul 29 2016 - 15:44:58 EST
On Fri, Jul 29, 2016 at 10:50 AM, Dave Hansen <dave.hansen@xxxxxxxxx> wrote:
> On 07/29/2016 10:29 AM, Andy Lutomirski wrote:
>>> > In the end, this ensures that threads which do not know how to
>>> > manage their own pkey rights can not do damage to data which is
>>> > pkey-protected.
>> I think you missed the fpu__clear() caller in kernel/fpu/signal.c.
>> ISTM it might be more comprehensible to change fpu__clear in general
>> and then special case things you want to behave differently.
> The code actually already patched the generic fpu__clear():
> fpu__clear() ->
> copy_init_fpstate_to_fpregs() ->
> So I think it hit the case you are talking about.
Whoops, missed that.
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