Hi,
I sent this suggestion to linux-arm-kernel in response to the Reliable
Stacktrace RFC from Mark Brown
and Mark Rutland. I am repeating it here for two reasons:
- It involves objtool.
- There are many more recipients in this thread that may be interested in this
topic.
Please let me know
On Fri, Jan 22, 2021 at 10:43:09PM +0100, Ard Biesheuvel wrote:
> On Fri, 22 Jan 2021 at 22:15, Madhavan T. Venkataraman
> wrote:
> > On 1/22/21 11:43 AM, Mark Brown wrote:
> > > On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
> > >
> > >> 2) The shadow stack idea sounds
On 1/22/21 3:43 PM, Ard Biesheuvel wrote:
> On Fri, 22 Jan 2021 at 22:15, Madhavan T. Venkataraman
> wrote:
>>
>>
>>
>> On 1/22/21 11:43 AM, Mark Brown wrote:
>>> On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
>>>
2) The shadow stack idea sounds promising -- how hard
On Fri, 22 Jan 2021 at 22:15, Madhavan T. Venkataraman
wrote:
>
>
>
> On 1/22/21 11:43 AM, Mark Brown wrote:
> > On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
> >
> >> 2) The shadow stack idea sounds promising -- how hard would it be to
> >>make a prototype reliable
On 1/22/21 11:43 AM, Mark Brown wrote:
> On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
>
>> 2) The shadow stack idea sounds promising -- how hard would it be to
>>make a prototype reliable unwinder?
>
> In theory it doesn't look too hard and I can't see a particular
On 1/22/21 11:43 AM, Mark Brown wrote:
> On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
>
>> 2) The shadow stack idea sounds promising -- how hard would it be to
>>make a prototype reliable unwinder?
>
> In theory it doesn't look too hard and I can't see a particular
On Fri, 22 Jan 2021 at 18:44, Mark Brown wrote:
>
> On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
>
> > 2) The shadow stack idea sounds promising -- how hard would it be to
> >make a prototype reliable unwinder?
>
> In theory it doesn't look too hard and I can't see a
On Thu, Jan 21, 2021 at 12:54:52PM -0600, Josh Poimboeuf wrote:
> 2) The shadow stack idea sounds promising -- how hard would it be to
>make a prototype reliable unwinder?
In theory it doesn't look too hard and I can't see a particular reason
not to try doing this - there's going to be edge
Ard,
Sorry, I was late to the party, attempting to reply to the entire thread
at once. Also, adding the live-patching ML.
I agree with a lot of your concerns. Reverse engineering the control
flow of the compiled binary is kind of ridiculous. I was always
surprised that it works. I still am!
On Thu, Jan 21, 2021 at 02:23:53PM +0100, Julien Thierry wrote:
> On 1/21/21 12:08 PM, Ard Biesheuvel wrote:
> > I am not aware of any plans to enable this in GCC, but the Clang
> > implementation is definitely intended for production use (it's a CFI
> > feature for ROP/JOP mitigation)
> I think
On 1/21/21 12:08 PM, Ard Biesheuvel wrote:
On Thu, 21 Jan 2021 at 11:26, Julien Thierry wrote:
Hi Ard,
On 1/21/21 10:03 AM, Ard Biesheuvel wrote:
Hello Julien,
On Wed, 20 Jan 2021 at 18:38, Julien Thierry wrote:
Hi,
This series enables objtool to start doing stack validation on
On Thu, 21 Jan 2021 at 12:23, Peter Zijlstra wrote:
>
> On Thu, Jan 21, 2021 at 12:08:23PM +0100, Ard Biesheuvel wrote:
> > On Thu, 21 Jan 2021 at 11:26, Julien Thierry wrote:
>
> > > I'm not familiar with toolcahin code models, but would this approach be
> > > able to validate assembly code
On Thu, Jan 21, 2021 at 12:08:23PM +0100, Ard Biesheuvel wrote:
> On Thu, 21 Jan 2021 at 11:26, Julien Thierry wrote:
> > I'm not familiar with toolcahin code models, but would this approach be
> > able to validate assembly code (either inline or in assembly files?)
> >
>
> No, it would not.
On Thu, 21 Jan 2021 at 11:26, Julien Thierry wrote:
>
> Hi Ard,
>
> On 1/21/21 10:03 AM, Ard Biesheuvel wrote:
> > Hello Julien,
> >
> > On Wed, 20 Jan 2021 at 18:38, Julien Thierry wrote:
> >>
> >> Hi,
> >>
> >> This series enables objtool to start doing stack validation on arm64
> >> kernel
Hi Ard,
On 1/21/21 10:03 AM, Ard Biesheuvel wrote:
Hello Julien,
On Wed, 20 Jan 2021 at 18:38, Julien Thierry wrote:
Hi,
This series enables objtool to start doing stack validation on arm64
kernel builds.
Could we elaborate on this point, please? 'Stack validation' means
getting an
Hello Julien,
On Wed, 20 Jan 2021 at 18:38, Julien Thierry wrote:
>
> Hi,
>
> This series enables objtool to start doing stack validation on arm64
> kernel builds.
Could we elaborate on this point, please? 'Stack validation' means
getting an accurate picture of all kernel code that will be
Hi,
This series enables objtool to start doing stack validation on arm64
kernel builds. It relies on the previous series I sent, refactoring
the arm64 decoder [1].
First, the aarch64 instruction decoder needed to be made available
to code under tools/. This is done in a similar manner to x86
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