On Thu, May 30, 2019 at 01:45:16PM +0800, Dianzhang Chen wrote:
>
> Though syscall `getrlimit` , it seems not works after
> check_prlimit_permission.
>
> And the speculation windows are large, as said[1]:
> >> Can the speculation proceed past the task_lock()? Or is the policy to
> >> ignore such
Though syscall `getrlimit` , it seems not works after check_prlimit_permission.
And the speculation windows are large, as said[1]:
>> Can the speculation proceed past the task_lock()? Or is the policy to
>> ignore such happy happenstances even if they are available?
>
> Locks are not in the way o
On Wed, May 29, 2019 at 10:39:52AM +0800, Dianzhang Chen wrote:
> Hi,
>
> Although when detect it is misprediction and drop the execution, but
> it can not drop all the effects of speculative execution, like the
> cache state. During the speculative execution, the:
>
>
> rlim = tsk->signal->rlim
Hi,
Although when detect it is misprediction and drop the execution, but
it can not drop all the effects of speculative execution, like the
cache state. During the speculative execution, the:
rlim = tsk->signal->rlim + resource;// use resource as index
...
*old_rlim = *rlim;
On Tue, May 28, 2019 at 10:37:10AM +0800, Dianzhang Chen wrote:
> Hi,
> Because when i reply your email,i always get 'Message rejected' from
> gmail(get this rejection from all the recipients). I still don't know
> how to deal with it, so i reply your email here:
Hi! This is weird. Next time simpl
On Mon, May 27, 2019 at 03:23:08PM +0800, Dianzhang Chen wrote:
> The `resource` in do_prlimit() is controlled by userspace via syscall:
> setrlimit(defined in kernel/sys.c), hence leading to a potential exploitation
> of the Spectre variant 1 vulnerability.
> The relevant code in do_prlimit() is
The `resource` in do_prlimit() is controlled by userspace via syscall:
setrlimit(defined in kernel/sys.c), hence leading to a potential exploitation
of the Spectre variant 1 vulnerability.
The relevant code in do_prlimit() is as below:
if (resource >= RLIM_NLIMITS)
return -EINVAL;
...
rl
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