On Fri, Sep 28, 2018 at 10:56:07PM +1000, Michael Ellerman wrote:
> The problem of low entropy at boot on systems without a good hardware
> source is sort of unsolvable.
>
> As you say it's up to the core kernel/random code, we shouldn't be
> trying to do anything tricky in the arch code.
>
> You
Christophe LEROY writes:
> Le 27/09/2018 à 09:45, Segher Boessenkool a écrit :
>> On Thu, Sep 27, 2018 at 08:20:00AM +0200, Christophe LEROY wrote:
...
>>
>>> However this is the canary for initial startup only. Only idle() still
>>> uses this canary once the system is running. A new canary is se
Le 27/09/2018 à 09:45, Segher Boessenkool a écrit :
On Thu, Sep 27, 2018 at 08:20:00AM +0200, Christophe LEROY wrote:
Le 26/09/2018 à 21:16, Segher Boessenkool a écrit :
On Wed, Sep 26, 2018 at 11:40:38AM +, Christophe Leroy wrote:
+static __always_inline void boot_init_stack_canary(voi
On Thu, Sep 27, 2018 at 08:20:00AM +0200, Christophe LEROY wrote:
> Le 26/09/2018 à 21:16, Segher Boessenkool a écrit :
> >On Wed, Sep 26, 2018 at 11:40:38AM +, Christophe Leroy wrote:
> >>+static __always_inline void boot_init_stack_canary(void)
> >>+{
> >>+ unsigned long canary;
> >>+
> >>+
Le 26/09/2018 à 21:16, Segher Boessenkool a écrit :
On Wed, Sep 26, 2018 at 11:40:38AM +, Christophe Leroy wrote:
+static __always_inline void boot_init_stack_canary(void)
+{
+ unsigned long canary;
+
+ /* Try to get a semi random initial value. */
+ get_random_bytes(&ca
On Wed, Sep 26, 2018 at 11:40:38AM +, Christophe Leroy wrote:
> +static __always_inline void boot_init_stack_canary(void)
> +{
> + unsigned long canary;
> +
> + /* Try to get a semi random initial value. */
> + get_random_bytes(&canary, sizeof(canary));
> + canary ^= mftb();
> +
