Thanks for the comments. I will respond to these and your next
email on Monday.
Madhavan
On 7/31/20 1:09 PM, Mark Rutland wrote:
> Hi,
>
> On Tue, Jul 28, 2020 at 08:10:46AM -0500, madve...@linux.microsoft.com wrote:
>> From: "Madhavan T. Venkataraman"
>> T
On 7/30/20 3:54 PM, Andy Lutomirski wrote:
> On Thu, Jul 30, 2020 at 7:24 AM Madhavan T. Venkataraman
> wrote:
>> ...
>> Creating a code page
>>
>>
>> We can do this in one of the following ways:
>>
>> - Allocate a wr
will
respond to the others in separate emails if that is alright
with you.
On 7/28/20 12:31 PM, Andy Lutomirski wrote:
>> On Jul 28, 2020, at 6:11 AM, madve...@linux.microsoft.com wrote:
>>
>> From: "Madhavan T. Venkataraman"
>>
>> The kernel creates the trampoli
Yes. I will fix this.
Thanks.
Madhavan
On 7/30/20 4:06 AM, Greg KH wrote:
> On Tue, Jul 28, 2020 at 08:10:48AM -0500, madve...@linux.microsoft.com wrote:
>> +EXPORT_SYMBOL_GPL(trampfd_valid_regs);
> Why are all of these exported? I don't see a module user in this
> series, or did I miss it
On 7/29/20 3:36 AM, David Laight wrote:
> From: Madhavan T. Venkataraman
>> Sent: 28 July 2020 19:52
> ...
>> trampfd faults are instruction faults that go through a different code path
>> than
>> the one that calls handle_mm_fault(). Perhaps, it is the handle_
I am working on a response to this. I will send it soon.
Thanks.
Madhavan
On 7/28/20 12:31 PM, Andy Lutomirski wrote:
>> On Jul 28, 2020, at 6:11 AM, madve...@linux.microsoft.com wrote:
>>
>> From: "Madhavan T. Venkataraman"
>>
>> The kernel cr
On 7/28/20 12:16 PM, Andy Lutomirski wrote:
> On Tue, Jul 28, 2020 at 9:32 AM Madhavan T. Venkataraman
> wrote:
>> Thanks. See inline..
>>
>> On 7/28/20 10:13 AM, David Laight wrote:
>>> From: madve...@linux.microsoft.com
>>>> Sent: 28 Ju
On 7/28/20 12:05 PM, James Morris wrote:
> On Tue, 28 Jul 2020, Casey Schaufler wrote:
>
>> You could make a separate LSM to do these checks instead of limiting
>> it to SELinux. Your use case, your call, of course.
> It's not limited to SELinux. This is hooked via the LSM API and
>
Thanks.
On 7/28/20 11:05 AM, Casey Schaufler wrote:
>> In this solution, the kernel recognizes certain sequences of instructions
>> as "well-known" trampolines. When such a trampoline is executed, a page
>> fault happens because the trampoline page does not have execute permission.
>> The kernel
Thanks. See inline..
On 7/28/20 10:13 AM, David Laight wrote:
> From: madve...@linux.microsoft.com
>> Sent: 28 July 2020 14:11
> ...
>> The kernel creates the trampoline mapping without any permissions. When
>> the trampoline is executed by user code, a page fault happens and the
>> kernel gets
Thanks. See inline..
On 7/28/20 9:50 AM, Oleg Nesterov wrote:
> On 07/28, madve...@linux.microsoft.com wrote:
>> +bool is_trampfd_vma(struct vm_area_struct *vma)
>> +{
>> +struct file *file = vma->vm_file;
>> +
>> +if (!file)
>> +return false;
>> +return
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