On Tue, Jul 08, 2025 at 06:08:18PM -0700, Sohil Mehta wrote:
> On 7/7/2025 1:03 AM, Kirill A. Shutemov wrote:
> > From: Sohil Mehta <sohil.mehta@xxxxxxxxx>
> >
> > For patching, the kernel initializes a temporary mm area in the lower
> > half of the address range. See commit 4fc19708b165 ("x86/alternatives:
> > Initialize temporary mm for patching").
> >
> > Disable LASS enforcement during patching to avoid triggering a #GP
> > fault.
> >
> > The objtool warns due to a call to a non-allowed function that exists
> > outside of the stac/clac guard, or references to any function with a
> > dynamic function pointer inside the guard. See the Objtool warnings
> > section #9 in the document tools/objtool/Documentation/objtool.txt.
> >
> > Considering that patching is usually small, replace the memcpy() and
> > memset() functions in the text poking functions with their open coded
> > versions.
> >
> > Signed-off-by: Sohil Mehta <sohil.mehta@xxxxxxxxx>
> > Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
>
> Kirill, it might be worth adding your co-developed-by tag. The patch has
> more changes than I can claim credit for.
Okay. Will do.
--
Kiryl Shutsemau / Kirill A. Shutemov
